Rust 1.41.0 not being built (signal: 11, SIGSEGV: invalid memory reference)

[Alzimzim]

https://github.com/rust-lang/rust/issues/68731

    error: could not compile `compiler_builtins`.
Caused by:
  process didn't exit successfully: `/builddir/build/BUILD/rustc-1.41.0-src/build/bootstrap/debug/rustc --crate-name compiler_builtins /builddir/build/BUILD/rustc-1.41.0-src/vendor/compiler_builtins/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=2 -C debuginfo=0 --cfg 'feature="c"' --cfg 'feature="cc"' --cfg 'feature="compiler-builtins"' --cfg 'feature="core"' --cfg 'feature="default"' --cfg 'feature="rustc-dep-of-std"' -C metadata=63fa04c7efa65202 -C extra-filename=-63fa04c7efa65202 --out-dir /builddir/build/BUILD/rustc-1.41.0-src/build/i686-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/release/deps --target i686-unknown-linux-gnu -L dependency=/builddir/build/BUILD/rustc-1.41.0-src/build/i686-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/release/deps -L dependency=/builddir/build/BUILD/rustc-1.41.0-src/build/i686-unknown-linux-gnu/stage1-std/release/deps --extern core=/builddir/build/BUILD/rustc-1.41.0-src/build/i686-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/release/deps/librustc_std_workspace_core-b3405ae5969d0864.rmeta --cap-lints allow -Clink-arg=-Wl,-z,relro,-z,now -Zexternal-macro-backtrace -Wrust_2018_idioms -Wunused_lifetimes -Dwarnings -Zsave-analysis -Cprefer-dynamic -Zbinary-dep-depinfo -L native=/builddir/build/BUILD/rustc-1.41.0-src/build/i686-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/release/build/compiler_builtins-c8b2c93ec2279576/out --cfg 'feature="unstable"' --cfg '__absvdi2="optimized-c"' --cfg '__absvsi2="optimized-c"' --cfg '__absvti2="optimized-c"' --cfg '__addvdi3="optimized-c"' --cfg '__addvsi3="optimized-c"' --cfg '__addvti3="optimized-c"' --cfg '__ashldi3="optimized-c"' --cfg '__ashrdi3="optimized-c"' --cfg '__clzdi2="optimized-c"' --cfg '__clzsi2="optimized-c"' --cfg '__clzti2="optimized-c"' --cfg '__cmpdi2="optimized-c"' --cfg '__cmpti2="optimized-c"' --cfg '__ctzdi2="optimized-c"' --cfg '__ctzsi2="optimized-c"' --cfg '__ctzti2="optimized-c"' --cfg '__divdc3="optimized-c"' --cfg '__divdi3="optimized-c"' --cfg '__divsc3="optimized-c"' --cfg '__divxc3="optimized-c"' --cfg '__extendhfsf2="optimized-c"' --cfg '__ffsti2="optimized-c"' --cfg '__floatdidf="optimized-c"' --cfg '__floatdisf="optimized-c"' --cfg '__floatdixf="optimized-c"' --cfg '__floatundidf="optimized-c"' --cfg '__floatundisf="optimized-c"' --cfg '__floatundixf="optimized-c"' --cfg '__int_util="optimized-c"' --cfg '__lshrdi3="optimized-c"' --cfg '__moddi3="optimized-c"' --cfg '__muldc3="optimized-c"' --cfg '__muldi3="optimized-c"' --cfg '__mulsc3="optimized-c"' --cfg '__mulvdi3="optimized-c"' --cfg '__mulvsi3="optimized-c"' --cfg '__mulvti3="optimized-c"' --cfg '__mulxc3="optimized-c"' --cfg '__negdf2="optimized-c"' --cfg '__negdi2="optimized-c"' --cfg '__negsf2="optimized-c"' --cfg '__negti2="optimized-c"' --cfg '__negvdi2="optimized-c"' --cfg '__negvsi2="optimized-c"' --cfg '__negvti2="optimized-c"' --cfg '__paritydi2="optimized-c"' --cfg '__paritysi2="optimized-c"' --cfg '__parityti2="optimized-c"' --cfg '__popcountdi2="optimized-c"' --cfg '__popcountsi2="optimized-c"' --cfg '__popcountti2="optimized-c"' --cfg '__powixf2="optimized-c"' --cfg '__subvdi3="optimized-c"' --cfg '__subvsi3="optimized-c"' --cfg '__subvti3="optimized-c"' --cfg '__truncdfhf2="optimized-c"' --cfg '__truncdfsf2="optimized-c"' --cfg '__truncsfhf2="optimized-c"' --cfg '__ucmpdi2="optimized-c"' --cfg '__ucmpti2="optimized-c"' --cfg '__udivdi3="optimized-c"' --cfg '__umoddi3="optimized-c"' --cfg 'apple_versioning="optimized-c"' -l static=compiler-rt` (signal: 11, SIGSEGV: invalid memory reference)
warning: build failed, waiting for other jobs to finish...
error: build failed
command did not execute successfully: "/builddir/build/BUILD/rust-1.40.0-i686-unknown-linux-gnu/usr/bin/cargo" "build" "-Zconfig-profile" "--target" "i686-unknown-linux-gnu" "-Zbinary-dep-depinfo" "-j" "4" "--release" "--frozen" "--features" "panic-unwind backtrace compiler-builtins-c" "--manifest-path" "/builddir/build/BUILD/rustc-1.41.0-src/src/libtest/Cargo.toml" "--message-format" "json-render-diagnostics"
expected success, got: exit code: 101
failed to run: /builddir/build/BUILD/rustc-1.41.0-src/build/bootstrap/debug/bootstrap build

[bjorn3]

Could you please run the failed command (the rustc command) in a debugger and post the backtrace?

For example:

$ gdb /builddir/build/BUILD/rustc-1.41.0-src/build/bootstrap/debug/rustc --crate-name compiler_builtins /builddir/build/BUILD/rustc-1.41.0-src/vendor/compiler_builtins/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=2 -C debuginfo=0 --cfg 'feature="c"' --cfg 'feature="cc"' --cfg 'feature="compiler-builtins"' --cfg 'feature="core"' --cfg 'feature="default"' --cfg 'feature="rustc-dep-of-std"' -C metadata=63fa04c7efa65202 -C extra-filename=-63fa04c7efa65202 --out-dir /builddir/build/BUILD/rustc-1.41.0-src/build/i686-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/release/deps --target i686-unknown-linux-gnu -L dependency=/builddir/build/BUILD/rustc-1.41.0-src/build/i686-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/release/deps -L dependency=/builddir/build/BUILD/rustc-1.41.0-src/build/i686-unknown-linux-gnu/stage1-std/release/deps --extern core=/builddir/build/BUILD/rustc-1.41.0-src/build/i686-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/release/deps/librustc_std_workspace_core-b3405ae5969d0864.rmeta --cap-lints allow -Clink-arg=-Wl,-z,relro,-z,now -Zexternal-macro-backtrace -Wrust_2018_idioms -Wunused_lifetimes -Dwarnings -Zsave-analysis -Cprefer-dynamic -Zbinary-dep-depinfo -L native=/builddir/build/BUILD/rustc-1.41.0-src/build/i686-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/release/build/compiler_builtins-c8b2c93ec2279576/out --cfg 'feature="unstable"' --cfg '__absvdi2="optimized-c"' --cfg '__absvsi2="optimized-c"' --cfg '__absvti2="optimized-c"' --cfg '__addvdi3="optimized-c"' --cfg '__addvsi3="optimized-c"' --cfg '__addvti3="optimized-c"' --cfg '__ashldi3="optimized-c"' --cfg '__ashrdi3="optimized-c"' --cfg '__clzdi2="optimized-c"' --cfg '__clzsi2="optimized-c"' --cfg '__clzti2="optimized-c"' --cfg '__cmpdi2="optimized-c"' --cfg '__cmpti2="optimized-c"' --cfg '__ctzdi2="optimized-c"' --cfg '__ctzsi2="optimized-c"' --cfg '__ctzti2="optimized-c"' --cfg '__divdc3="optimized-c"' --cfg '__divdi3="optimized-c"' --cfg '__divsc3="optimized-c"' --cfg '__divxc3="optimized-c"' --cfg '__extendhfsf2="optimized-c"' --cfg '__ffsti2="optimized-c"' --cfg '__floatdidf="optimized-c"' --cfg '__floatdisf="optimized-c"' --cfg '__floatdixf="optimized-c"' --cfg '__floatundidf="optimized-c"' --cfg '__floatundisf="optimized-c"' --cfg '__floatundixf="optimized-c"' --cfg '__int_util="optimized-c"' --cfg '__lshrdi3="optimized-c"' --cfg '__moddi3="optimized-c"' --cfg '__muldc3="optimized-c"' --cfg '__muldi3="optimized-c"' --cfg '__mulsc3="optimized-c"' --cfg '__mulvdi3="optimized-c"' --cfg '__mulvsi3="optimized-c"' --cfg '__mulvti3="optimized-c"' --cfg '__mulxc3="optimized-c"' --cfg '__negdf2="optimized-c"' --cfg '__negdi2="optimized-c"' --cfg '__negsf2="optimized-c"' --cfg '__negti2="optimized-c"' --cfg '__negvdi2="optimized-c"' --cfg '__negvsi2="optimized-c"' --cfg '__negvti2="optimized-c"' --cfg '__paritydi2="optimized-c"' --cfg '__paritysi2="optimized-c"' --cfg '__parityti2="optimized-c"' --cfg '__popcountdi2="optimized-c"' --cfg '__popcountsi2="optimized-c"' --cfg '__popcountti2="optimized-c"' --cfg '__powixf2="optimized-c"' --cfg '__subvdi3="optimized-c"' --cfg '__subvsi3="optimized-c"' --cfg '__subvti3="optimized-c"' --cfg '__truncdfhf2="optimized-c"' --cfg '__truncdfsf2="optimized-c"' --cfg '__truncsfhf2="optimized-c"' --cfg '__ucmpdi2="optimized-c"' --cfg '__ucmpti2="optimized-c"' --cfg '__udivdi3="optimized-c"' --cfg '__umoddi3="optimized-c"' --cfg 'apple_versioning="optimized-c"' -l static=compiler-rt
(gdb) run
(gdb) bt
(gdb) quit

[Alzimzim]

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Type "apropos word" to search for commands related to "word"...
Reading symbols from /builddir/build/BUILD/rustc-1.41.0-src/build/bootstrap/debug/rustc...done.
warning: Missing auto-load script at offset 0 in section .debug_gdb_scripts
of file /builddir/build/BUILD/rustc-1.41.0-src/build/bootstrap/debug/rustc.
Use `info auto-load python-scripts [REGEXP]' to list them.
(gdb) run
Starting program: /builddir/build/BUILD/rustc-1.41.0-src/build/bootstrap/debug/rustc --crate-name compiler_builtins /builddir/build/BUILD/rustc-1.41.0-src/vendor/compiler_builtins/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=2 -C debuginfo=0 --cfg feature=\"c\" --cfg feature=\"cc\" --cfg feature=\"compiler-builtins\" --cfg feature=\"core\" --cfg feature=\"default\" --cfg feature=\"rustc-dep-of-std\" -C metadata=63fa04c7efa65202 -C extra-filename=-63fa04c7efa65202 --out-dir /builddir/build/BUILD/rustc-1.41.0-src/build/i686-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/release/deps --target i686-unknown-linux-gnu -L dependency=/builddir/build/BUILD/rustc-1.41.0-src/build/i686-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/release/deps -L dependency=/builddir/build/BUILD/rustc-1.41.0-src/build/i686-unknown-linux-gnu/stage1-std/release/deps --extern core=/builddir/build/BUILD/rustc-1.41.0-src/build/i686-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/release/deps/librustc_std_workspace_core-b3405ae5969d0864.rmeta --cap-lints allow -Clink-arg=-Wl,-z,relro,-z,now -Zexternal-macro-backtrace -Wrust_2018_idioms -Wunused_lifetimes -Dwarnings -Zsave-analysis -Cprefer-dynamic -Zbinary-dep-depinfo -L native=/builddir/build/BUILD/rustc-1.41.0-src/build/i686-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/release/build/compiler_builtins-c8b2c93ec2279576/out --cfg feature=\"unstable\" --cfg __absvdi2=\"optimized-c\" --cfg __absvsi2=\"optimized-c\" --cfg __absvti2=\"optimized-c\" --cfg __addvdi3=\"optimized-c\" --cfg __addvsi3=\"optimized-c\" --cfg __addvti3=\"optimized-c\" --cfg __ashldi3=\"optimized-c\" --cfg __ashrdi3=\"optimized-c\" --cfg __clzdi2=\"optimized-c\" --cfg __clzsi2=\"optimized-c\" --cfg __clzti2=\"optimized-c\" --cfg __cmpdi2=\"optimized-c\" --cfg __cmpti2=\"optimized-c\" --cfg __ctzdi2=\"optimized-c\" --cfg __ctzsi2=\"optimized-c\" --cfg __ctzti2=\"optimized-c\" --cfg __divdc3=\"optimized-c\" --cfg __divdi3=\"optimized-c\" --cfg __divsc3=\"optimized-c\" --cfg __divxc3=\"optimized-c\" --cfg __extendhfsf2=\"optimized-c\" --cfg __ffsti2=\"optimized-c\" --cfg __floatdidf=\"optimized-c\" --cfg __floatdisf=\"optimized-c\" --cfg __floatdixf=\"optimized-c\" --cfg __floatundidf=\"optimized-c\" --cfg __floatundisf=\"optimized-c\" --cfg __floatundixf=\"optimized-c\" --cfg __int_util=\"optimized-c\" --cfg __lshrdi3=\"optimized-c\" --cfg __moddi3=\"optimized-c\" --cfg __muldc3=\"optimized-c\" --cfg __muldi3=\"optimized-c\" --cfg __mulsc3=\"optimized-c\" --cfg __mulvdi3=\"optimized-c\" --cfg __mulvsi3=\"optimized-c\" --cfg __mulvti3=\"optimized-c\" --cfg __mulxc3=\"optimized-c\" --cfg __negdf2=\"optimized-c\" --cfg __negdi2=\"optimized-c\" --cfg __negsf2=\"optimized-c\" --cfg __negti2=\"optimized-c\" --cfg __negvdi2=\"optimized-c\" --cfg __negvsi2=\"optimized-c\" --cfg __negvti2=\"optimized-c\" --cfg __paritydi2=\"optimized-c\" --cfg __paritysi2=\"optimized-c\" --cfg __parityti2=\"optimized-c\" --cfg __popcountdi2=\"optimized-c\" --cfg __popcountsi2=\"optimized-c\" --cfg __popcountti2=\"optimized-c\" --cfg __powixf2=\"optimized-c\" --cfg __subvdi3=\"optimized-c\" --cfg __subvsi3=\"optimized-c\" --cfg __subvti3=\"optimized-c\" --cfg __truncdfhf2=\"optimized-c\" --cfg __truncdfsf2=\"optimized-c\" --cfg __truncsfhf2=\"optimized-c\" --cfg __ucmpdi2=\"optimized-c\" --cfg __ucmpti2=\"optimized-c\" --cfg __udivdi3=\"optimized-c\" --cfg __umoddi3=\"optimized-c\" --cfg apple_versioning=\"optimized-c\" -l static=compiler-rt
Missing separate debuginfo for /lib/ld-linux.so.2
Try: urpmf /usr/lib/debug/.build-id/0a/db173ed1765ceba8401dbb286f6ed3b3f66066.debug
Missing separate debuginfo for /lib/libdl.so.2
Try: urpmf /usr/lib/debug/.build-id/60/32b7594a09ea0b325514b9d75517b2619eee0c.debug
Missing separate debuginfo for /lib/i686/librt.so.1
Try: urpmf /usr/lib/debug/.build-id/ba/ec09e7aeccccf3ac8be1b0a8d3f068f6f556e8.debug
Missing separate debuginfo for /lib/i686/libpthread.so.0
Try: urpmf /usr/lib/debug/.build-id/e2/bb064e174e706b663a0c47ee93986a7c4365df.debug
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i686/libthread_db.so.1".
Missing separate debuginfo for /lib/libgcc_s.so.1
Try: urpmf /usr/lib/debug/.build-id/b9/0779c22856369bd946045fbcf695df754aa316.debug
Missing separate debuginfo for /lib/i686/libc.so.6
Try: urpmf /usr/lib/debug/.build-id/c4/ed0f7c2562fa8309ca7f420b4a342a14295156.debug
Missing separate debuginfo for /lib/i686/libm.so.6
Try: urpmf /usr/lib/debug/.build-id/49/2a00ac5010761fd90c25aa9e1ccdac892a2526.debug
thread 'main' panicked at 'RUSTC_STAGE was not set: NotPresent', src/libcore/result.rs:1165:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
[Inferior 1 (process 55) exited with code 0145]
(gdb) bt
No stack.
(gdb) quit
-bash-4.4# 

rpm-buildroot.tar.gz

Fedora https://bugzilla.redhat.com/show_bug.cgi?id=1797127

[bjorn3]

I missed that you were compiling rustc. Could you please run ./x.py build -vv to show the actual command line of the real rustc and then run that one in a debugger?

[mikhailnov]

@bjorn3 I think it may be quicker for you to download rpm-buildroot.tar.gz by the link above, chroot into /var/lib/mock*/rosa*/root inside it and see what you want

[bjorn3]

I just read the linked fedora bug report and saw a backtrace there. The SIGSEGV happens in LLVM, which I don't know much about it's internals.

[cuviper]

Please note, I've already identified the likely LLVM fix in that Fedora bug report. It's also fine with LLVM 9.

[mikhailnov]

@cuviper me and @Alzimzim can confirm that there is no crash with llvm9

[cuviper]

So the solution is to patch your LLVM, as I intend to do in Fedora 30. It's not really a bug in compiler-builtins -- it just started using functionality that's broken in older LLVM.

[mikhailnov]

Cherry-picking that commit to llvm8 has fixed buillding rust 1.41.0 i686. https://abf.io/import/llvm/commit/44b794ab9fc86a3a0ffa4878aea96443a33fbb37

Thanks for bibisecting.