many debuginfo tests fail with SIGSEGV, SIGILL, SIGABRT with gdb 11.2 on armhf (armv7-unknown-linux-gnueabihf)

[infinity0]

This seems like a separate issue from #94458 as it only happens on armhf in Debian:

• good build with gdb 10 / armhf - https://buildd.debian.org/status/fetch.php?pkg=rustc&arch=armhf&ver=1.59.0%2Bdfsg1-1%7Eexp1&stamp=1648671960&raw=0 (note: overall build failed for other reasons, but the debuginfo tests passed)
• bad build with gdb 11.2 / armhf - https://buildd.debian.org/status/fetch.php?pkg=rustc&arch=armhf&ver=1.59.0%2Bdfsg1-1&stamp=1652370219&raw=0
• good build with gdb 11.2 / amd64 - https://buildd.debian.org/status/fetch.php?pkg=rustc&arch=amd64&ver=1.59.0%2Bdfsg1-1&stamp=1652282324&raw=0

test [debuginfo-gdb] debuginfo/associated-types.rs ... FAILED
test [debuginfo-gdb] debuginfo/by-value-self-argument-in-trait-impl.rs ... FAILED
test [debuginfo-gdb] debuginfo/captured-fields-2.rs ... FAILED
test [debuginfo-gdb] debuginfo/closure-in-generic-function.rs ... FAILED
test [debuginfo-gdb] debuginfo/captured-fields-1.rs ... FAILED
test [debuginfo-gdb] debuginfo/destructured-fn-argument.rs ... FAILED
test [debuginfo-gdb] debuginfo/function-arguments.rs ... FAILED
test [debuginfo-gdb] debuginfo/generator-objects.rs ... FAILED
test [debuginfo-gdb] debuginfo/generator-locals.rs ... FAILED
test [debuginfo-gdb] debuginfo/generic-function.rs ... FAILED
test [debuginfo-gdb] debuginfo/generic-functions-nested.rs ... FAILED
test [debuginfo-gdb] debuginfo/generic-method-on-generic-struct.rs ... FAILED
test [debuginfo-gdb] debuginfo/generic-static-method-on-struct-and-enum.rs ... FAILED
test [debuginfo-gdb] debuginfo/lexical-scope-in-for-loop.rs ... FAILED
test [debuginfo-gdb] debuginfo/lexical-scope-in-match.rs ... FAILED
test [debuginfo-gdb] debuginfo/lexical-scope-in-if.rs ... FAILED
test [debuginfo-gdb] debuginfo/lexical-scope-in-stack-closure.rs ... FAILED
test [debuginfo-gdb] debuginfo/lexical-scope-in-unconditional-loop.rs ... FAILED
test [debuginfo-gdb] debuginfo/lexical-scope-in-unique-closure.rs ... FAILED
test [debuginfo-gdb] debuginfo/lexical-scope-in-while.rs ... FAILED
test [debuginfo-gdb] debuginfo/lexical-scope-with-macro.rs ... FAILED
test [debuginfo-gdb] debuginfo/method-on-generic-struct.rs ... FAILED
test [debuginfo-gdb] debuginfo/method-on-struct.rs ... FAILED
test [debuginfo-gdb] debuginfo/method-on-tuple-struct.rs ... FAILED
test [debuginfo-gdb] debuginfo/method-on-trait.rs ... FAILED
test [debuginfo-gdb] debuginfo/multi-cgu.rs ... FAILED
test [debuginfo-gdb] debuginfo/multiple-functions.rs ... FAILED
test [debuginfo-gdb] debuginfo/multiple-functions-equal-var-names.rs ... FAILED
test [debuginfo-gdb] debuginfo/name-shadowing-and-scope-nesting.rs ... FAILED
test [debuginfo-gdb] debuginfo/self-in-default-method.rs ... FAILED
test [debuginfo-gdb] debuginfo/self-in-generic-default-method.rs ... FAILED
test [debuginfo-gdb] debuginfo/shadowed-argument.rs ... FAILED
test [debuginfo-gdb] debuginfo/shadowed-variable.rs ... FAILED
test [debuginfo-gdb] debuginfo/simple-lexical-scope.rs ... FAILED
test [debuginfo-gdb] debuginfo/static-method-on-struct-and-enum.rs ... FAILED
test [debuginfo-gdb] debuginfo/step-into-match.rs ... FAILED
test [debuginfo-gdb] debuginfo/var-captured-in-sendable-closure.rs ... FAILED
test [debuginfo-gdb] debuginfo/var-captured-in-nested-closure.rs ... FAILED
test [debuginfo-gdb] debuginfo/var-captured-in-stack-closure.rs ... FAILED

Example errors:

Breakpoint 1 at 0x6e4: file /<<PKGBUILDDIR>>/src/test/debuginfo/associated-types.rs, line 111.
Breakpoint 2 at 0x77c: file /<<PKGBUILDDIR>>/src/test/debuginfo/associated-types.rs, line 118.
Breakpoint 3 at 0x7d8: file /<<PKGBUILDDIR>>/src/test/debuginfo/associated-types.rs, line 122.
Breakpoint 4 at 0x874: file /<<PKGBUILDDIR>>/src/test/debuginfo/associated-types.rs, line 130.
Breakpoint 5 at 0x8e8: file /<<PKGBUILDDIR>>/src/test/debuginfo/associated-types.rs, line 137.
Breakpoint 6 at 0x90c: file /<<PKGBUILDDIR>>/src/test/debuginfo/associated-types.rs, line 140.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".

Breakpoint 1, associated_types::assoc_struct<i32> (arg=...) at /<<PKGBUILDDIR>>/src/test/debuginfo/associated-types.rs:111
111         zzz(); // #break
$1 = associated_types::Struct<i32> {b: -1, b1: 0}

Program received signal SIGSEGV, Segmentation fault.
0x004005b0 in _start ()

------stderr------------------------------
/<<PKGBUILDDIR>>/build/armv7-unknown-linux-gnueabihf/test/debuginfo/associated-types.gdb/associated-types.debugger.script:17: Error in sourced command file:
No symbol 'inferred' in current context

------------------------------------------

error: gdb failed to execute
status: exit status: 1
command: "/usr/bin/gdb" "-quiet" "-batch" "-nx" "-command=/<<PKGBUILDDIR>>/build/armv7-unknown-linux-gnueabihf/test/debuginfo/associated-types.gdb/associated-types.debugger.script"

Breakpoint 1 at 0x734: file /<<PKGBUILDDIR>>/src/test/debuginfo/by-value-self-argument-in-trait-impl.rs, line 52.
Breakpoint 2 at 0x760: file /<<PKGBUILDDIR>>/src/test/debuginfo/by-value-self-argument-in-trait-impl.rs, line 64.
Breakpoint 3 at 0x788: file /<<PKGBUILDDIR>>/src/test/debuginfo/by-value-self-argument-in-trait-impl.rs, line 71.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".

Breakpoint 1, by_value_self_argument_in_trait_impl::{impl#0}::method (self=1111) at /<<PKGBUILDDIR>>/src/test/debuginfo/by-value-self-argument-in-trait-impl.rs:52
52              zzz(); // #break
$1 = 1111

Program received signal SIGILL, Illegal instruction.
0x004006b2 in __do_global_dtors_aux ()

------stderr------------------------------
/<<PKGBUILDDIR>>/build/armv7-unknown-linux-gnueabihf/test/debuginfo/by-value-self-argument-in-trait-impl.gdb/by-value-self-argument-in-trait-impl.debugger.script:14: Error in sourced command file:
No symbol 'self' in current context

------------------------------------------

error: gdb failed to execute
status: exit status: 1
command: "/usr/bin/gdb" "-quiet" "-batch" "-nx" "-command=/<<PKGBUILDDIR>>/build/armv7-unknown-linux-gnueabihf/test/debuginfo/by-value-self-argument-in-trait-impl.gdb/by-value-self-argument-in-trait-impl.debugger.script"

Most other failures are due to SIGSEGV or SIGILL, but we also have one SIGABRT:

Breakpoint 1 at 0x1088: method-on-generic-struct.rs:137. (2 locations)
Breakpoint 2 at 0x117c: method-on-generic-struct.rs:142. (2 locations)
Breakpoint 3 at 0x12c4: file /<<PKGBUILDDIR>>/src/test/debuginfo/method-on-generic-struct.rs, line 147.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".

Breakpoint 1, method_on_generic_struct::Struct<(u32, i32)>::self_by_ref<(u32, i32)> (self=0xfffeeb2c, arg1=-1, arg2=-2) at /<<PKGBUILDDIR>>/src/test/debuginfo/method-on-generic-struct.rs:137
137             zzz(); // #break
$1 = method_on_generic_struct::Struct<(u32, i32)> {x: (8888, -8888)}
$2 = -1
$3 = -2

Program received signal SIGABRT, Aborted.
0xf7d337d6 in ?? () from /lib/arm-linux-gnueabihf/libc.so.6

------stderr------------------------------
/<<PKGBUILDDIR>>/build/armv7-unknown-linux-gnueabihf/test/debuginfo/method-on-generic-struct.gdb/method-on-generic-struct.debugger.script:16: Error in sourced command file:
No symbol 'self' in current context

------------------------------------------

error: gdb failed to execute
status: exit status: 1
command: "/usr/bin/gdb" "-quiet" "-batch" "-nx" "-command=/<<PKGBUILDDIR>>/build/armv7-unknown-linux-gnueabihf/test/debuginfo/method-on-generic-struct.gdb/method-on-generic-struct.debugger.script"

[infinity0]

I reproduced the failures with 1.58.1 on a Debian armhf machine, so it's not 1.59 specific.

[infinity0]

The issue exists all the way back to version 1.13 at https://static.rust-lang.org/dist/rust-1.13.0-armv7-unknown-linux-gnueabihf.tar.gz - using this to RUSTC_BOOTSTRAP=1 rustc -g src/test/debuginfo/associated-types.rs then running gdb -x dbg.script ./associated-types fails with SIGILL, with script dbg.script extracted from the build directory of 1.58.1:

set charset UTF-8
show version
set print pretty off
set language rust
break 'associated-types.rs':111
break 'associated-types.rs':118
break 'associated-types.rs':122
break 'associated-types.rs':130
break 'associated-types.rs':137
break 'associated-types.rs':140
run
print arg
continue
print inferred
print explicitly
continue
print arg
continue
print arg
continue
print a
print b
continue
print a
print b
continue
quit

The issue probably exists with all rustc versions, but I was unable to test versions earlier than 1.13 because they seem to link to an older incompatible libc that expects ld-linux.so.3 rather than the ld-linux-armhf.so.3 I had on this machine.

So it's likely an issue/regression with gdb 11.2 rather than rustc.

[infinity0]

Filed to gdb here: https://sourceware.org/bugzilla/show_bug.cgi?id=29272

[luis-machado-arm]

Fixed in GDB now. Thanks for reporting it. Sorry it took a little while.