Building fails on OpenBSD due to missing sendmmsg in libc

[h3artbl33d]

Description

In an effort to make Chatmail compatible with OpenBSD and OpenSMTPD, I ran into the issue where deltachat-core-rust won't install from source, due to an issue with quinn. Resolving it seems less trivial as noted in the respective repository.

Is there a feasible way to work around this issue? Eg, is quinn a hard dependency for deltachat-core-rust?

Details

• Operating System: OpenBSD (OpenBSD 7.5-current (GENERIC.MP) #58: Thu May 9 13:42:15 MDT 2024)
• Expected behavior: The crate installs as expected
• Actual behavior: Fails due to a subdependency issue
• Steps to reproduce the problem: Execute cargo install --git https://github.com/deltachat/deltachat-core-rust/ deltachat-rpc-server on OpenBSD
• Logs:

$ cargo install --git https://github.com/deltachat/deltachat-core-rust/ deltachat-rpc-server

    Updating git repository `https://github.com/deltachat/deltachat-core-rust/`
    [...]
    Compiling quinn-udp v0.4.1
error[E0425]: cannot find value `IP_RECVTOS` in crate `libc`
    --> /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/quinn-udp-0.4.1/src/unix.rs:99:75
     |
99   |         if let Err(err) = set_socket_option(&*io, libc::IPPROTO_IP, libc::IP_RECVTOS, OPTION_ON) {
     |                                                                           ^^^^^^^^^^ help: a constant with a similar name exists: `IP_RECVIF`
     |
    ::: /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/libc-0.2.154/src/unix/bsd/netbsdlike/openbsd/mod.rs:1246:1
     |
1246 | pub const IP_RECVIF: ::c_int = 30;
     | ---------------------------- similarly named constant `IP_RECVIF` defined here

error[E0425]: cannot find value `IPV6_DONTFRAG` in crate `libc`
   --> /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/quinn-udp-0.4.1/src/unix.rs:151:59
    |
151 |         set_socket_option(&*io, libc::IPPROTO_IPV6, libc::IPV6_DONTFRAG, OPTION_ON)?;
    |                                                           ^^^^^^^^^^^^^ not found in `libc`

error[E0412]: cannot find type `mmsghdr` in crate `libc`
   --> /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/quinn-udp-0.4.1/src/unix.rs:177:26
    |
177 |       let mut msgs: [libc::mmsghdr; BATCH_SIZE] = unsafe { mem::zeroed() };
    |                            ^^^^^^^ help: a struct with a similar name exists: `cmsghdr`
    |
   ::: /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/libc-0.2.154/src/unix/bsd/mod.rs:10:1
    |
10  | / s! {
11  | |     pub struct sockaddr {
12  | |         pub sa_len: u8,
13  | |         pub sa_family: sa_family_t,
...   |
125 | |     }
126 | | }
    | |_- similarly named struct `cmsghdr` defined here

error[E0412]: cannot find type `mmsghdr` in crate `libc`
   --> /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/quinn-udp-0.4.1/src/unix.rs:321:24
    |
321 |       msgvec: *mut libc::mmsghdr,
    |                          ^^^^^^^ help: a struct with a similar name exists: `cmsghdr`
    |
   ::: /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/libc-0.2.154/src/unix/bsd/mod.rs:10:1
    |
10  | / s! {
11  | |     pub struct sockaddr {
12  | |         pub sa_len: u8,
13  | |         pub sa_family: sa_family_t,
...   |
125 | |     }
126 | | }
    | |_- similarly named struct `cmsghdr` defined here

error[E0425]: cannot find value `SYS_sendmmsg` in crate `libc`
   --> /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/quinn-udp-0.4.1/src/unix.rs:328:39
    |
328 |         let ret = libc::syscall(libc::SYS_sendmmsg, sockfd, msgvec, vlen, flags) as libc::c_int;
    |                                       ^^^^^^^^^^^^ not found in `libc`

error[E0412]: cannot find type `mmsghdr` in crate `libc`
   --> /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/quinn-udp-0.4.1/src/unix.rs:360:24
    |
360 |       msgvec: *mut libc::mmsghdr,
    |                          ^^^^^^^ help: a struct with a similar name exists: `cmsghdr`
    |
   ::: /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/libc-0.2.154/src/unix/bsd/mod.rs:10:1
    |
10  | / s! {
11  | |     pub struct sockaddr {
12  | |         pub sa_len: u8,
13  | |         pub sa_family: sa_family_t,
...   |
125 | |     }
126 | | }
    | |_- similarly named struct `cmsghdr` defined here

error[E0412]: cannot find type `mmsghdr` in crate `libc`
   --> /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/quinn-udp-0.4.1/src/unix.rs:383:50
    |
383 |       let mut hdrs = unsafe { mem::zeroed::<[libc::mmsghdr; BATCH_SIZE]>() };
    |                                                    ^^^^^^^ help: a struct with a similar name exists: `cmsghdr`
    |
   ::: /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/libc-0.2.154/src/unix/bsd/mod.rs:10:1
    |
10  | / s! {
11  | |     pub struct sockaddr {
12  | |         pub sa_len: u8,
13  | |         pub sa_family: sa_family_t,
...   |
125 | |     }
126 | | }
    | |_- similarly named struct `cmsghdr` defined here

error[E0412]: cannot find type `mmsghdr` in crate `libc`
   --> /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/quinn-udp-0.4.1/src/unix.rs:448:24
    |
448 |       msgvec: *mut libc::mmsghdr,
    |                          ^^^^^^^ help: a struct with a similar name exists: `cmsghdr`
    |
   ::: /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/libc-0.2.154/src/unix/bsd/mod.rs:10:1
    |
10  | / s! {
11  | |     pub struct sockaddr {
12  | |         pub sa_len: u8,
13  | |         pub sa_family: sa_family_t,
...   |
125 | |     }
126 | | }
    | |_- similarly named struct `cmsghdr` defined here

error[E0425]: cannot find value `SYS_recvmmsg` in crate `libc`
   --> /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/quinn-udp-0.4.1/src/unix.rs:457:33
    |
457 |             libc::syscall(libc::SYS_recvmmsg, sockfd, msgvec, vlen, flags, timeout) as libc::c_int;
    |                                 ^^^^^^^^^^^^ not found in `libc`

error[E0412]: cannot find type `mmsghdr` in crate `libc`
   --> /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/quinn-udp-0.4.1/src/unix.rs:489:24
    |
489 |       msgvec: *mut libc::mmsghdr,
    |                          ^^^^^^^ help: a struct with a similar name exists: `cmsghdr`
    |
   ::: /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/libc-0.2.154/src/unix/bsd/mod.rs:10:1
    |
10  | / s! {
11  | |     pub struct sockaddr {
12  | |         pub sa_len: u8,
13  | |         pub sa_family: sa_family_t,
...   |
125 | |     }
126 | | }
    | |_- similarly named struct `cmsghdr` defined here

error[E0531]: cannot find unit struct, unit variant or constant `IP_RECVTOS` in crate `libc`
    --> /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/quinn-udp-0.4.1/src/unix.rs:629:73
     |
629  |             (libc::IPPROTO_IP, libc::IP_TOS) | (libc::IPPROTO_IP, libc::IP_RECVTOS) => unsafe {
     |                                                                         ^^^^^^^^^^ help: a constant with a similar name exists: `IP_RECVIF`
     |
    ::: /home/h3artbl33d/.cargo/registry/src/index.crates.io-6f17d22bba15001f/libc-0.2.154/src/unix/bsd/netbsdlike/openbsd/mod.rs:1246:1
     |
1246 | pub const IP_RECVIF: ::c_int = 30;
     | ---------------------------- similarly named constant `IP_RECVIF` defined here

Some errors have detailed explanations: E0412, E0425, E0531.
For more information about an error, try `rustc --explain E0412`.
error: could not compile `quinn-udp` (lib) due to 11 previous errors
warning: build failed, waiting for other jobs to finish...
error: failed to compile `deltachat-rpc-server v1.137.4 (https://github.com/deltachat/deltachat-core-rust/#14aaab05)`, intermediate artifacts can be found at `/tmp/cargo-installPQSQeI`.
To reuse those artifacts with a future compilation, set the environment variable `CARGO_TARGET_DIR` to that path.

[hpk42]

Quinn has a somewhat stale issues on this quinn-rs/quinn#1469 .... This is used by iroh which in turn is used for multi-device setup and (in the future for realtime channels between chat peers). Its otherwise not needed for DC core operations so it could maybe be behind a feature flag.

[link2xt]

The problem is missing libc::IP_RECVTOS, not sendmmsg. sendmmsg is there: https://man.openbsd.org/sendmmsg

But it tries to use syscall which only makes sense for Linux where syscalls are a stable API.

[link2xt]

Documenting what I did on a VM:

• pkg_add git to clone the repo.
• pkg_add rust to install Rust 1.77. There is no support from rustup and no official builds of Rust for OpenBSD.
• pkg_add gmake to build vendored OpenSSL.
• pkg_add ripgred and pkg_add rust-rustfmt

Added user to staff group with usermod -G staff user and usermod -L staff user, then increased datasize-cur in /etc/login.conf for staff so compilation does not run out of memory.

[link2xt]

I think the way to go is to make quinn-udp build on OpenBSD (i.e. fix quinn-rs/quinn#1469) and then update quinn version we use for iroh 0.4.

[link2xt]

recvmmsg support was only added recently in OpenBSD 7.2 and libc crate is not aware of it yet, I filed an issue: rust-lang/libc#3696

[link2xt]

Short-term fix I am going to hide iroh behind conditional compilation (not feature flag, just make backup transfer always return an error when compiled on OpenBSD).

[dignifiedquire]

Work on the iroh side to get this fixed

• fix: compile on openbsd n0-computer/quinn#6
• [[email protected]] fix: OpenBSD compatible n0-computer/iroh#2282

[link2xt]

Segmentation fault of test binary trying to run after disabling iroh:

(gdb) r
Starting program: /home/user/link2xt/deltachat-core-rust/target/debug/deps/deltachat-e5ef9b9e62bfb452
Error while reading shared library symbols:
Dwarf Error: wrong version in compilation unit header (is 4, should be 2) [in module /usr/libexec/ld.so]

running 797 tests
test accounts::tests::test_account_new_open ... ok
test accounts::tests::test_account_new_add_remove ... ok
test accounts::tests::test_accounts_remove_last ... ok
test accounts::tests::test_account_new_open_conflict ... ok

Program received signal SIGSEGV, Segmentation fault.
[Switching to thread 608841]
sha512_block_data_order_avx2 () at crypto/sha/sha512-x86_64.s:4139
4139	crypto/sha/sha512-x86_64.s: No such file or directory.
	in crypto/sha/sha512-x86_64.s
Current language:  auto; currently asm
(gdb) bt
#0  sha512_block_data_order_avx2 () at crypto/sha/sha512-x86_64.s:4139
#1  0x0000098c4379bd11 in SHA512_Update (c=Variable "c" is not available.
) at crypto/sha/sha512.c:317
#2  0x0000098c43726c5a in HMAC_Init_ex (ctx=Variable "ctx" is not available.
) at crypto/hmac/hmac.c:79
#3  0x0000098c438b70d0 in kdf_pbkdf2_derive (vctx=Variable "vctx" is not available.
) at providers/implementations/kdfs/pbkdf2.c:353
#4  0x0000098c437135fc in ossl_pkcs5_pbkdf2_hmac_ex (pass=Variable "pass" is not available.
) at crypto/evp/p5_crpt2.c:60
#5  0x0000098c43713675 in PKCS5_PBKDF2_HMAC (pass=Variable "pass" is not available.
) at crypto/evp/p5_crpt2.c:87
#6  0x0000098c43531bb8 in sqlcipher_openssl_kdf (algorithm=Variable "algorithm" is not available.
) at sqlcipher/sqlite3.c:106114
#7  0x0000098c43530bcf in sqlcipher_cipher_ctx_key_derive (ctx=Variable "ctx" is not available.
) at sqlcipher/sqlite3.c:104552
#8  0x0000098c4353095a in sqlcipher_codec_key_derive (ctx=Variable "ctx" is not available.
) at sqlcipher/sqlite3.c:104604
#9  0x0000098c4352e432 in sqlite3Codec (iCtx=Variable "iCtx" is not available.
) at sqlcipher/sqlite3.c:102824
#10 0x0000098c43542fe6 in pager_write_pagelist (pPager=Variable "pPager" is not available.
) at sqlcipher/sqlite3.c:58549
#11 0x0000098c43525b13 in sqlite3PagerCommitPhaseOne (pPager=Variable "pPager" is not available.
) at sqlcipher/sqlite3.c:60722
#12 0x0000098c43525d34 in sqlite3BtreeCommitPhaseOne (p=Variable "p" is not available.
) at sqlcipher/sqlite3.c:71331
#13 0x0000098c43549df5 in sqlite3VdbeHalt (p=Variable "p" is not available.
) at sqlcipher/sqlite3.c:83889
#14 0x0000098c43555155 in sqlite3VdbeExec (p=Variable "p" is not available.
) at sqlcipher/sqlite3.c:89923
#15 0x0000098c43523113 in sqlite3_step (pStmt=Variable "pStmt" is not available.
) at sqlcipher/sqlite3.c:87100
#16 0x0000098c43515ee3 in _ZN8rusqlite10Connection13execute_batch17h386a2b465d4b3431E () at raw_statement.rs:106
#17 0x0000098c42693e8b in _ZN8rusqlite6pragma38_$LT$impl$u20$rusqlite..Connection$GT$13pragma_update17h2b071e0d4cc0d0c6E () at pragma.rs:270
#18 0x0000098c426966a8 in _ZN9deltachat3sql14new_connection17h7267efe88618b3c0E () at sql.rs:700
#19 0x0000098c42695d85 in _ZN9deltachat3sql3Sql8new_pool17h07660a7823a05d61E () at sql.rs:186
#20 0x0000098c42c6b4cf in _ZN9deltachat3sql3Sql8try_open28_$u7b$$u7b$closure$u7d$$u7d$17hd61906c6f9bd4109E () at sql.rs:195
#21 0x0000098c42c6e8c6 in _ZN9deltachat3sql3Sql4open28_$u7b$$u7b$closure$u7d$$u7d$17h49e1961ba7d400ecE () at sql.rs:290
#22 0x0000098c42f74ef2 in _ZN9deltachat7context7Context4open28_$u7b$$u7b$closure$u7d$$u7d$17hbaab2ec0182697fbE () at context.rs:378
#23 0x0000098c41ea3e6c in _ZN9deltachat8accounts5tests22test_encrypted_account28_$u7b$$u7b$closure$u7d$$u7d$17h2dd2bce7d85666bfE () at accounts.rs:957
#24 0x0000098c42606bff in _ZN72_$LT$core..pin..Pin$LT$P$GT$$u20$as$u20$core..future..future..Future$GT$4poll17h8b212170e807c74cE () at future.rs:124
#25 0x0000098c42c56b62 in _ZN5tokio7runtime4park16CachedParkThread8block_on28_$u7b$$u7b$closure$u7d$$u7d$17h5369daeb39dde537E () at park.rs:281
#26 0x0000098c42c565a5 in _ZN5tokio7runtime4park16CachedParkThread8block_on17hf0955bafbfcfc934E () at coop.rs:107
#27 0x0000098c41d9760e in _ZN5tokio7runtime7context8blocking19BlockingRegionGuard8block_on17he090172519ab2a8dE () at blocking.rs:66
#28 0x0000098c42aee83f in _ZN5tokio7runtime9scheduler12multi_thread11MultiThread8block_on28_$u7b$$u7b$closure$u7d$$u7d$17h805983381f623028E () at mod.rs:87
#29 0x0000098c41b5987a in _ZN5tokio7runtime7context7runtime13enter_runtime17he68e896d58c921e3E () at runtime.rs:65
#30 0x0000098c42aee788 in _ZN5tokio7runtime9scheduler12multi_thread11MultiThread8block_on17hd19021d98aea220cE () at mod.rs:86
#31 0x0000098c41b5ac1a in _ZN5tokio7runtime7runtime7Runtime8block_on17hcc229c9fc1b1a7c2E () at runtime.rs:351
#32 0x0000098c41b61b19 in _ZN9deltachat8accounts5tests22test_encrypted_account17h2bc7b3782fad5e6bE () at accounts.rs:978
#33 0x0000098c41ea33c9 in _ZN9deltachat8accounts5tests22test_encrypted_account28_$u7b$$u7b$closure$u7d$$u7d$17hc65929151051f629E () at accounts.rs:937
#34 0x0000098c418e99ac in _ZN4core3ops8function6FnOnce9call_once17h235766f453eb28edE () at function.rs:250
#35 0x0000098c430df5b7 in test::__rust_begin_short_backtrace::hbaadcb723cb5b710 () at result.rs:1959
#36 0x0000098c430f3d58 in test::types::RunnableTest::run::h0e862da4cb07f5fb () at result.rs:1959
#37 0x0000098c430df778 in test::run_test_in_process::h735a0456eab16c8e () at result.rs:1959
#38 0x0000098c430e92ec in std::sys_common::backtrace::__rust_begin_short_backtrace::h73adbab8f80b1d53 () at result.rs:1959
#39 0x0000098c4311c6cd in core::ops::function::FnOnce::call_once$u7b$$u7b$vtable.shim$u7d$$u7d$::h923b1a7995c70caa () at result.rs:1959
#40 0x0000098c438e9c2d in std::sys::pal::unix::thread::Thread::new::thread_start::h2580486cfabf0af3 () from /home/user/link2xt/deltachat-core-rust/target/debug/deps/deltachat-e5ef9b9e62bfb452
#41 0x0000098ef8512282 in _rthread_start (v=Unhandled dwarf expression opcode 0xa3
) at /usr/src/lib/librthread/rthread.c:96
#42 0x0000098e716327ba in __tfork_thread () at /usr/src/lib/libc/arch/amd64/sys/tfork_thread.S:87
#43 0x0000098e716327ba in __tfork_thread () at /usr/src/lib/libc/arch/amd64/sys/tfork_thread.S:87
Previous frame identical to this frame (corrupt stack?)

I think the problem is not SQLCipher vs SQLite, but race condition between using the connection and tearing it down from another thread. Likely a bug in unsafe code of rusqlite. I am pretty sure it is not the cryptography itself (SHA512 etc.) that is failing, so switching from SQLCipher to SQLite does not make much sense IMO.

[dignifiedquire]

crypto/sha/sha512-x86_64.s: No such file or directory.

I don't think it is a race condition, but rather a compile issue in the vendored version of deltachat. Everything works fine when disabling the vendoring

[link2xt]

What is the problem with vendored version of SQLCipher? It is the same version 4.5.6 as in the ports tree. Maybe compilation flags are different, OpenBSD ones are here:
https://github.com/openbsd/ports/blob/f325df573d683382c2119c03d710d07d95333365/databases/sqlcipher/Makefile#L28

"No such file or directory" just says that source code is not found by gdb.

sqlite3_step segfaulting looks like use-after-free for me.

I have minimized segfault to this:

use std::error::Error;
use std::fs;

use rusqlite::{Connection, OpenFlags};

fn main() -> Result<(), Box<dyn Error>> {
    fs::remove_file("foobar.db").ok();
    let conn = Connection::open_with_flags(
        "foobar.db",
        OpenFlags::SQLITE_OPEN_READ_WRITE | OpenFlags::SQLITE_OPEN_CREATE,
    )?;
    conn.pragma_update(None, "key", "foobar")?;
    conn.execute("CREATE TABLE foo (bar INTEGER)", ())?;

    Ok(())
}

Corresponding Cargo.toml:

[package]
name = "minmalsegfault"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
rusqlite = { version = "0.31.0", features = ["sqlcipher", "bundled-sqlcipher-vendored-openssl"] }

It does not segfault if bundled-sqlcipher-vendored-openssl feature is removed or replaced with bundled-sqlcipher.

It also does not segfault if I run it under lldb, and then does not segfault if I run it directly as target/debug/minimalsegfault, but starts segfaulting again if I remove target/debug/minimalsegfault and rebuild it:

deltachat$ sha256 target/debug/minmalsegfault
SHA256 (target/debug/minmalsegfault) = 473a948649749621cddd7dc27316323b6e99d9019de079bfaecb5c72b633ac41
deltachat$ target/debug/minmalsegfault
Segmentation fault (core dumped)
deltachat$ lldb target/debug/minmalsegfault
(lldb) target create "target/debug/minmalsegfault"
Current executable set to '/home/user/link2xt/minmalsegfault/target/debug/minmalsegfault' (x86_64).
(lldb) r
Process 81083 launched: '/home/user/link2xt/minmalsegfault/target/debug/minmalsegfault' (x86_64)
Process 81083 exited with status = 0 (0x00000000)
(lldb) ^D
deltachat$ target/debug/minmalsegfault
deltachat$ target/debug/minmalsegfault
deltachat$ rm target/debug/minmalsegfault
deltachat$ cargo build
    Finished dev [unoptimized + debuginfo] target(s) in 0.37s
deltachat$ sha256 target/debug/minmalsegfault
SHA256 (target/debug/minmalsegfault) = 473a948649749621cddd7dc27316323b6e99d9019de079bfaecb5c72b633ac41
deltachat$ target/debug/minmalsegfault
Segmentation fault (core dumped)

Backtrace from gdb:

(gdb) r
Starting program: /home/user/link2xt/minmalsegfault/target/debug/minmalsegfault
Error while reading shared library symbols:
Dwarf Error: wrong version in compilation unit header (is 4, should be 2) [in module /usr/libexec/ld.so]

Program received signal SIGSEGV, Segmentation fault.
aesni_set_encrypt_key () at crypto/aes/aesni-x86_64.s:4326
4326	crypto/aes/aesni-x86_64.s: No such file or directory.
	in crypto/aes/aesni-x86_64.s
Current language:  auto; currently asm
(gdb) bt
#0  aesni_set_encrypt_key () at crypto/aes/aesni-x86_64.s:4326
#1  0x00000a2ed092b5ad in cipher_hw_aesni_initkey (dat=Variable "dat" is not available.
) at cipher_aes_hw_aesni.inc:37
#2  0x00000a2ed098af48 in cipher_generic_init_internal (ctx=Variable "ctx" is not available.
) at providers/implementations/ciphers/ciphercommon.c:221
#3  0x00000a2ed098ae12 in ossl_cipher_generic_einit (vctx=Variable "vctx" is not available.
) at providers/implementations/ciphers/ciphercommon.c:232
#4  0x00000a2ed07234b1 in evp_cipher_init_internal (ctx=Variable "ctx" is not available.
) at refcount.h:52
#5  0x00000a2ed0723613 in EVP_CipherInit_ex (ctx=Variable "ctx" is not available.
) at crypto/evp/evp_enc.c:462
#6  0x00000a2ed097685f in drbg_ctr_set_ctx_params_locked (vctx=Variable "vctx" is not available.
) at providers/implementations/rands/drbg_ctr.c:603
#7  0x00000a2ed09744b0 in drbg_ctr_instantiate_wrapper (vdrbg=Variable "vdrbg" is not available.
) at providers/implementations/rands/drbg_ctr.c:341
#8  0x00000a2ed082b774 in EVP_RAND_instantiate (ctx=Variable "ctx" is not available.
) at crypto/evp/evp_rand.c:517
#9  0x00000a2ed082ce8b in rand_new_drbg (libctx=Variable "libctx" is not available.
) at crypto/rand/rand_lib.c:687
#10 0x00000a2ed082c0c1 in RAND_get0_primary (ctx=Variable "ctx" is not available.
) at crypto/rand/rand_lib.c:734
#11 0x00000a2ed082c563 in RAND_get0_public (ctx=Variable "ctx" is not available.
) at crypto/rand/rand_lib.c:765
#12 0x00000a2ed082c484 in RAND_bytes_ex (ctx=Variable "ctx" is not available.
) at crypto/rand/rand_lib.c:378
#13 0x00000a2ed05bfa9f in sqlcipher_openssl_random (ctx=0x0, buffer=0xa31b1fd8748, length=16) at sqlcipher/sqlite3.c:110178
#14 0x00000a2ed05bdbf9 in sqlcipher_codec_ctx_init_kdf_salt (ctx=0xa31b1fe1328) at sqlcipher/sqlite3.c:108411
#15 0x00000a2ed05be679 in sqlcipher_cipher_ctx_key_derive (ctx=0xa31b1fe1328, c_ctx=0xa31b1fcee78) at sqlcipher/sqlite3.c:108790
#16 0x00000a2ed05be4af in sqlcipher_codec_key_derive (ctx=0xa31b1fe1328) at sqlcipher/sqlite3.c:108860
#17 0x00000a2ed05ba54a in sqlite3Codec (iCtx=0xa31b1fe1328, data=0xa3170ca4008, pgno=1, mode=6) at sqlcipher/sqlite3.c:107084
#18 0x00000a2ed05de20b in pager_write_pagelist (pPager=0xa31b1fcda88, pList=0xa3170ca5040) at sqlcipher/sqlite3.c:61135
#19 0x00000a2ed05ab989 in sqlite3PagerCommitPhaseOne (pPager=0xa31b1fcda88, zSuper=0x0, noSync=0) at sqlcipher/sqlite3.c:63319
#20 0x00000a2ed05abdfa in sqlite3BtreeCommitPhaseOne (p=0xa31b1fdf008, zSuperJrnl=0x0) at sqlcipher/sqlite3.c:74361
#21 0x00000a2ed05ecf79 in vdbeCommit (db=0xa31b1ff6388, p=0xa31b1fde508) at sqlcipher/sqlite3.c:87333
#22 0x00000a2ed05ec29e in sqlite3VdbeHalt (p=0xa31b1fde508) at sqlcipher/sqlite3.c:87743
#23 0x00000a2ed05f36a2 in sqlite3VdbeExec (p=0xa31b1fde508) at sqlcipher/sqlite3.c:93895
#24 0x00000a2ed05af4f1 in sqlite3Step (p=0xa31b1fde508) at sqlcipher/sqlite3.c:90705
#25 0x00000a2ed05a8ee8 in sqlite3_step (pStmt=0xa31b1fde508) at sqlcipher/sqlite3.c:90766
#26 0x00000a2ed058a52a in _ZN8rusqlite13raw_statement12RawStatement4step17h1cc4ee59cbbf8421E (self=0x79b39c47bf40) at raw_statement.rs:106
#27 0x00000a2ed058b477 in _ZN8rusqlite9statement9Statement29execute_with_bound_parameters17ha94539f0bfccc097E (self=0x79b39c47bf38) at statement.rs:659
#28 0x00000a2ed058bd63 in _ZN8rusqlite9statement9Statement7execute17h37b2ea6d243471b8E (self=0x79b39c47bf38, params=0) at statement.rs:113
#29 0x00000a2ed058c960 in _ZN8rusqlite10Connection7execute28_$u7b$$u7b$closure$u7d$$u7d$28_$u7b$$u7b$closure$u7d$$u7d$17h95289cb346774e2aE () at lib.rs:622
#30 0x00000a2ed058b91c in _ZN4core6result19Result$LT$T$C$E$GT$8and_then17h156c923f2b70eba2E (self=Variable "self" is not available.
) at result.rs:1316
#31 0x00000a2ed058c8ec in _ZN8rusqlite10Connection7execute28_$u7b$$u7b$closure$u7d$$u7d$17h11bc1bbdb057931cE (stmt=Variable "stmt" is not available.
) at lib.rs:622
#32 0x00000a2ed058b9e7 in _ZN4core6result19Result$LT$T$C$E$GT$8and_then17h9c31c7498f85d62bE (self=Variable "self" is not available.
) at result.rs:1316
#33 0x00000a2ed058c85a in _ZN8rusqlite10Connection7execute17h911cbc4321d9f801E (self=0x79b39c47c0d0, sql=
      {data_ptr = 0xa2ed04acd7f "CREATE TABLE foo (bar INTEGER)src/main.rsdescription() is deprecated; use Display�r", length = 30}, params=0) at lib.rs:621
#34 0x00000a2ed058a855 in _ZN14minmalsegfault4main17haa5db2fd92e500efE () at main.rs:14
#35 0x00000a2ed058aeb2 in _ZN4core3ops8function6FnOnce9call_once17hb96fff8ad01e0288E () at function.rs:250
#36 0x00000a2ed058c485 in _ZN3std10sys_common9backtrace28__rust_begin_short_backtrace17hd166fc0a34471332E (f=0xa2ed058a600 <_ZN14minmalsegfault4main17haa5db2fd92e500efE>)
    at backtrace.rs:155
#37 0x00000a2ed058ab18 in _ZN3std2rt10lang_start28_$u7b$$u7b$closure$u7d$$u7d$17hac38d9a6d186d8e8E () at rt.rs:166
#38 0x00000a2ed09abe29 in std::rt::lang_start_internal::hf9bc85ac22917681 () from /home/user/link2xt/minmalsegfault/target/debug/minmalsegfault
#39 0x00000a2ed058aaec in _ZN3std2rt10lang_start17hb8161abf303dc758E (main=0xa2ed058a600 <_ZN14minmalsegfault4main17haa5db2fd92e500efE>, argc=1, argv=0x79b39c47c698, sigpipe=0 '\0')
    at rt.rs:165
#40 0x00000a2ed058a9f5 in main () at function.rs:249

The most interesting part is here:

#13 0x00000a2ed05bfa9f in sqlcipher_openssl_random (ctx=0x0, buffer=0xa31b1fd8748, length=16) at sqlcipher/sqlite3.c:110178
#14 0x00000a2ed05bdbf9 in sqlcipher_codec_ctx_init_kdf_salt (ctx=0xa31b1fe1328) at sqlcipher/sqlite3.c:108411

In sqlcipher_codec_ctx_init_kdf_salt the code looks like this around line 108411:

    if(ctx->provider->random(ctx->provider_ctx, ctx->kdf_salt, ctx->kdf_salt_sz) != SQLITE_OK) {

Then in the backtrace we see that sqlcipher_openssl_random is called with ctx=0x0 as the first argument, so apparently ctx->provider_ctx was NULL.

So it looks like this provider_ctx initialization failed at some point (probably when setting the key), but connection remains usable in Rust after that, yet segfaults when you try to actually use it. Likely a bug that should be upstreamed to sqlcipher, it should not leave connection in a broken state like this even if setting the key failed.

EDIT: actually it seems that ctx is never set by OpenSSL initialization and sqlcipher_openssl_random does not use it. It is probably only used by different "providers", in case of OpenSSL it is ok to be NULL.

[link2xt]

I have opened upstream issue: rusqlite/rusqlite#1503