[Buildroot] [PATCH RFC 1/1] support/testing/tests/package/test_zfs: fix uclibc test by using bleeding-edge toolchain

Fri May 9 16:33:35 UTC 2025

Unfortunately I've also seen that uclibc-ng on aarch64 is lacking. It's 
been a while since I've tested, but the TLS issue pretty much make all 
C++ written software buggy and/or non-functioning. Probably best to go 
to another libc for this architecture sad to say.

Lance

On 5/9/2025 9:34 AM, Waldemar Brodkorb wrote:
> Hi,
>
> the bug is known to me. It only happens on aarch64 not on arm.
> I have no idea why python3 segfaults. It has something todo with a
> TLS bug in uClibc-ng.
>
> best regards
>   Waldemar
>
> Vincent Fazio wrote,
>
>> CC: Waldemar
>>
>>> -----Original Message-----
>>> From: buildroot <buildroot-bounces at buildroot.org> On Behalf Of José
>>> Luis Salvador Rufo
>>> Sent: Tuesday, May 6, 2025 12:57 PM
>>> To: Julien Olivain <ju.o at free.fr>
>>> Cc: buildroot at buildroot.org; Vincent Fazio <vfazio at xes-inc.com>
>>> Subject: [External] - Re: [Buildroot] [PATCH RFC 1/1]
>>> support/testing/tests/package/test_zfs: fix uclibc test by using
>>> bleeding-edge toolchain
>>>
>>> Hello @Vincent Fazio <vfazio at xes-inc.com> I saw that you submitted a
>>> patch a few months ago to fix the thread address error:
>>> https://raw.githubusercontent.com/buildroot/buildroot/d63e207eb869063
>>> f82c867658676c2903beb08cb/package/python3/0009-Fix-thread-
>>> identifiers-on-32-bit-musl-builds.patch
>>>
>>> It looks like we might be encountering the same issue again
>>> (si_addr=0x7373616c6362760b).
>>> Could this be another upstream issue? (see:
>>> https://github.com/python/cpython/blob/main/Python/thread_pthread.h#L
>>> 312)
>>>
>>> What do you think?
>>>
>>> Here is the strace output:
>>>
>>>
>>> # strace /usr/bin/python3.13
>>> execve("/usr/bin/python3.13", ["/usr/bin/python3.13"], 0xffffe7396230
>>> /* 10 vars */) = 0
>>> readlinkat(AT_FDCWD, "/proc/self/exe", "/usr/bin/python3.13", 4096) =
>>> 19 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
>>> -1,
>>> 0) = 0xffff81806000
>>> openat(AT_FDCWD, "/lib/libpython3.13.so.1.0", O_RDONLY) = -1 ENOENT
>>> (No such file or directory) openat(AT_FDCWD,
>>> "/usr/lib/libpython3.13.so.1.0", O_RDONLY) = 3 fstat(3,
>>> {st_mode=S_IFREG|0755, st_size=5357776, ...}) = 0 mmap(NULL, 4096,
>>> PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
>>> 0) = 0xffff81805000
>>> read(3,
>>> "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0\267\0\1\0\0\0\0\0\0\0\0\0\0\0"..
>>> .,
>>> 4096) = 4096
>>> mmap(NULL, 5828608, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
>>> 0xffff81276000
>>> mmap(0xffff81276000, 4514232, PROT_READ|PROT_EXEC,
>>> MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xffff81276000 mmap(0xffff816c5000,
>>> 842184, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x44e000) =
>>> 0xffff816c5000 mmap(0xffff81793000, 465896, PROT_READ|PROT_WRITE,
>>> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xffff81793000
>>> close(3)                                = 0
>>> munmap(0xffff81805000, 4096)            = 0
>>> openat(AT_FDCWD, "/lib/libc.so.0", O_RDONLY) = 3 fstat(3,
>>> {st_mode=S_IFREG|0755, st_size=723704, ...}) = 0 mmap(NULL, 4096,
>>> PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
>>> 0) = 0xffff81805000
>>> read(3,
>>> "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0\267\0\1\0\0\0\0\0\0\0\0\0\0\0"..
>>> .,
>>> 4096) = 4096
>>> mmap(NULL, 761856, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
>>> 0xffff811bc000 mmap(0xffff811bc000, 714260, PROT_READ|PROT_EXEC,
>>> MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xffff811bc000 mmap(0xffff8126b000,
>>> 5324, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0xaf000) =
>>> 0xffff8126b000 mmap(0xffff8126d000, 34024, PROT_READ|PROT_WRITE,
>>> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xffff8126d000
>>> close(3)                                = 0
>>> munmap(0xffff81805000, 4096)            = 0
>>> openat(AT_FDCWD, "/lib/libc.so.0", O_RDONLY) = 3 fstat(3,
>>> {st_mode=S_IFREG|0755, st_size=723704, ...}) = 0
>>> close(3)                                = 0
>>> newfstatat(AT_FDCWD, "/lib/ld-uClibc.so.0", {st_mode=S_IFREG|0755,
>>> st_size=33928, ...}, 0) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE,
>>> MAP_PRIVATE|MAP_ANONYMOUS, -1,
>>> 0) = 0xffff81805000
>>> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
>>> 0) = 0xffff811bb000
>>> mprotect(0xaaaade621000, 4096, PROT_READ) = 0
>>> mprotect(0xffff816c5000, 323584, PROT_READ) = 0
>>> mprotect(0xffff8126b000, 4096, PROT_READ) = 0
>>> mprotect(0xffff81812000, 4096, PROT_READ) = 0
>>> set_tid_address(0xffff811bb0d0)         = 106
>>> set_robust_list(0xffff811bb0e0, 24)     = 0
>>> rt_sigaction(SIGRTMIN, {sa_handler=0xffff812224a4, sa_mask=[],
>>> sa_flags=SA_SIGINFO}, NULL, 8) = 0 rt_sigaction(SIGRT_1,
>>> {sa_handler=0xffff812223bc, sa_mask=[],
>>> sa_flags=SA_RESTART|SA_SIGINFO}, NULL, 8) = 0
>>> rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0 prlimit64(0,
>>> RLIMIT_STACK, NULL, {rlim_cur=8192*1024,
>>> rlim_max=RLIM64_INFINITY}) = 0
>>> ioctl(0, TCGETS, {c_iflag=ICRNL|IXON|IXOFF,
>>> c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR,
>>> c_cflag=B38400|CS8|CREAD|HUPCL|CLOCAL,
>>> c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE, ...}) = 0
>>> ioctl(1, TCGETS, {c_iflag=ICRNL|IXON|IXOFF,
>>> c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR,
>>> c_cflag=B38400|CS8|CREAD|HUPCL|CLOCAL,
>>> c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE, ...}) = 0
>>> getrandom("\xf2\x3f\xe8\x25\xff\x8b\xe6\xb2\xdf\x1b\xc2\x96\x20\x6c\x
>>> 16\x55\xae\x06\x7a\xcb\xb5\x99\xbc\xf9\x3c\x21\xfd\x05\x52\xae\xff\x7
>>> b",
>>> 32, GRND_NONBLOCK) = 32
>>> brk(NULL)                               = 0xaaaade623000
>>> brk(0xaaaade624000)                     = 0xaaaade624000
>>> openat(AT_FDCWD, "/proc/sys/vm/overcommit_memory", O_RDONLY) = 3
>>> read(3, "0\n", 32)                      = 2
>>> close(3)                                = 0
>>> clock_gettime(CLOCK_MONOTONIC, {tv_sec=17, tv_nsec=16727584}) = 0
>>> clock_gettime(CLOCK_MONOTONIC, {tv_sec=17, tv_nsec=24778944}) = 0
>>> clock_gettime(CLOCK_MONOTONIC, {tv_sec=17, tv_nsec=25320784}) = 0
>>> getrandom("\x90\xcb\x78\x23\xee\xdc\x38\x0b\x74\x1a\xf8\x3b\xb2\x54\x
>>> fe\xf0\x89\x10\x13\x08\x25\x8b\x45\x98",
>>> 24, GRND_NONBLOCK) = 24
>>> gettid()                                = 106
>>> write(2, "Fatal Python error: ", 20Fatal Python error: )    = 20
>>> write(2, "_PyThreadState_Attach", 21_PyThreadState_Attach)   = 21
>>> write(2, ": ", 2: )                       = 2
>>> write(2, "non-NULL old thread state", 25non-NULL old thread state) =
>>> 25 write(2, "\n", 1
>>> )                       = 1
>>> write(2, "Python runtime state: ", 22Python runtime state: )  = 22
>>> write(2, "preinitialized", 14preinitialized)          = 14
>>> write(2, "\n", 1
>>> )                       = 1
>>> write(2, "\n", 1
>>> )                       = 1
>>> write(2, "Thread 0x", 9Thread 0x)                = 9
>>> --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR,
>>> si_addr=0x7373616c6362760b} ---
>>> +++ killed by SIGSEGV +++
>>> Segmentation fault
>>> #
>> I think this is slightly different in that maybe some TLS slot is dirty https://github.com/python/cpython/blob/fe18437089e6eccfa09e7c12a4f807fc158274ba/Python/pystate.c#L2083
>>
>> I don’t remember running into this issue when doing testing for https://gitlab.com/buildroot.org/buildroot/-/issues/95 when I tested all C lib implementations.
>>
>> I assume this is failing on 3.12.3?
>>
>>
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