* powerpc: userspace processes crash on abort() from libc.so.6
@ 2026-08-27 5:43 Shivaprasad G Bhat
2026-08-27 11:38 ` Shrikanth Hegde
0 siblings, 1 reply; 3+ messages in thread
From: Shivaprasad G Bhat @ 2026-08-27 5:43 UTC (permalink / raw)
To: linuxppc-dev, tglx, maddy, christophe.leroy, riteshh; +Cc: linux-kernel
Hi All, Thomas,
On my PPC64 machine, I see the below systemd crash orginating from
abort() during boot on top of the tree. Complete dmesg can be seen here [1]
abort (libc.so.6 + 0x29484)
__libc_message_impl (libc.so.6 + 0x9e00c)
__libc_fatal (libc.so.6 + 0x9e06c)
start_thread (libc.so.6 + 0xadffc)
__clone (libc.so.6 + 0x152d68)
__clone (libc.so.6 + 0x152d68)
create_thread.constprop.0 (libc.so.6 + 0xad9c8)
The git bisect pointed me to commit 3424d8c18a7da "(Merge tag
'core-entry-2026-08-17' of
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip)"
Please find the kernel config used to build the kernel at [2].
I have tried applying the pending fixes from Mukesh [3] and Ritesh [4]
for the currently outstanding issues and still see the problem.
The system is running Fedora 42, with glibc-2.41-7.fc42.ppc64le. The
complete list of toolchain and packages can be found here [5]
Thanks and Regards,
Shivaprasad
References:
1 - https://gist.github.com/shivaprasadbhat/6f166374bab12b4f4c1cd4ac829e562c
2 - https://gist.github.com/shivaprasadbhat/aa499468e124015eec5932fb13e88e05
3 - https://lore.kernel.org/linuxppc-dev/lda1jyut.ritesh.list@gmail.com/#t
4 -
https://lore.kernel.org/linuxppc-dev/20260820134718.2176411-1-mkchauras@gmail.com/
5 - https://gist.github.com/shivaprasadbhat/ae56ca849c3009e8642a6313dc465ea7
=========
Backtrace from dmesg:
[ 22.039343][ T1833] systemd-coredump[1833]: Module
libsystemd-shared-257.6-1.fc42.so from rpm systemd-257.6-1.fc42.ppc64le
[ 22.039378][ T1833] systemd-coredump[1833]: Stack trace of thread 1828:
[ 22.039378][ T1833] systemd-coredump[1833]: Stack trace of thread 1828:
[ 22.039401][ T1833] systemd-coredump[1833]: #0 0x00007fffa4c29484
abort (libc.so.6 + 0x29484)
[ 22.039401][ T1833] systemd-coredump[1833]: #0 0x00007fffa4c29484
abort (libc.so.6 + 0x29484)
[ 22.039429][ T1833] systemd-coredump[1833]: #1 0x00007fffa4c9e00c
__libc_message_impl (libc.so.6 + 0x9e00c)
[ 22.039429][ T1833] systemd-coredump[1833]: #1 0x00007fffa4c9e00c
__libc_message_impl (libc.so.6 + 0x9e00c)
[ 22.039461][ T1833] systemd-coredump[1833]: #2 0x00007fffa4c9e06c
__libc_fatal (libc.so.6 + 0x9e06c)
[ 22.039461][ T1833] systemd-coredump[1833]: #2 0x00007fffa4c9e06c
__libc_fatal (libc.so.6 + 0x9e06c)
[ 22.039491][ T1833] systemd-coredump[1833]: #3 0x00007fffa4cadffc
start_thread (libc.so.6 + 0xadffc)
[ 22.039491][ T1833] systemd-coredump[1833]: #3 0x00007fffa4cadffc
start_thread (libc.so.6 + 0xadffc)
[ 22.039521][ T1833] systemd-coredump[1833]: #4 0x00007fffa4d52d68
__clone (libc.so.6 + 0x152d68)
[ 22.039521][ T1833] systemd-coredump[1833]: #4 0x00007fffa4d52d68
__clone (libc.so.6 + 0x152d68)
[ 22.039551][ T1833] systemd-coredump[1833]: #5 0x00007fffa4d52d68
__clone (libc.so.6 + 0x152d68)
[ 22.039551][ T1833] systemd-coredump[1833]: #5 0x00007fffa4d52d68
__clone (libc.so.6 + 0x152d68)
[ 22.039580][ T1833] systemd-coredump[1833]: #6 0x00007fffa4cad9c8
create_thread.constprop.0 (libc.so.6 + 0xad9c8)
[ 22.039580][ T1833] systemd-coredump[1833]: #6 0x00007fffa4cad9c8
create_thread.constprop.0 (libc.so.6 + 0xad9c8)
[ 22.039614][ T1833] systemd-coredump[1833]: #7 0x00000000003af858
n/a (n/a + 0x0)
[ 22.039614][ T1833] systemd-coredump[1833]: #7 0x00000000003af858
n/a (n/a + 0x0)
[ 22.039639][ T1833] systemd-coredump[1833]: ELF object binary
architecture: PowerPC64
[ 22.039639][ T1833] systemd-coredump[1833]: ELF object binary
architecture: PowerPC64
[ 22.042109][ T1] systemd[1]: systemd-journald.service: Scheduled
restart job, restart counter is at 1.
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: powerpc: userspace processes crash on abort() from libc.so.6
2026-08-27 5:43 powerpc: userspace processes crash on abort() from libc.so.6 Shivaprasad G Bhat
@ 2026-08-27 11:38 ` Shrikanth Hegde
2026-08-27 14:16 ` Shivaprasad G Bhat
0 siblings, 1 reply; 3+ messages in thread
From: Shrikanth Hegde @ 2026-08-27 11:38 UTC (permalink / raw)
To: Shivaprasad G Bhat, linuxppc-dev, tglx
Cc: linux-kernel, maddy, christophe.leroy, riteshh
Hi Shivaprasad.
On 8/27/26 11:13 AM, Shivaprasad G Bhat wrote:
>
> Hi All, Thomas,
>
> On my PPC64 machine, I see the below systemd crash orginating from abort() during boot on top of the tree. Complete dmesg can be seen here [1]
> abort (libc.so.6 + 0x29484)
> __libc_message_impl (libc.so.6 + 0x9e00c)
> __libc_fatal (libc.so.6 + 0x9e06c)
> start_thread (libc.so.6 + 0xadffc)
> __clone (libc.so.6 + 0x152d68)
> __clone (libc.so.6 + 0x152d68)
> create_thread.constprop.0 (libc.so.6 + 0xad9c8)
>
> The git bisect pointed me to commit 3424d8c18a7da "(Merge tag 'core-entry-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip)"
>
> Please find the kernel config used to build the kernel at [2].
>
> I have tried applying the pending fixes from Mukesh [3] and Ritesh [4] for the currently outstanding issues and still see the problem.
>
> The system is running Fedora 42, with glibc-2.41-7.fc42.ppc64le. The
> complete list of toolchain and packages can be found here [5]
>
> Thanks and Regards,
> Shivaprasad
>
> References:
> 1 - https://gist.github.com/shivaprasadbhat/6f166374bab12b4f4c1cd4ac829e562c
> 2 - https://gist.github.com/shivaprasadbhat/aa499468e124015eec5932fb13e88e05
> 3 - https://lore.kernel.org/linuxppc-dev/lda1jyut.ritesh.list@gmail.com/#t
> 4 - https://lore.kernel.org/linuxppc-dev/20260820134718.2176411-1-mkchauras@gmail.com/
> 5 - https://gist.github.com/shivaprasadbhat/ae56ca849c3009e8642a6313dc465ea7
>
> =========
> Backtrace from dmesg:
> [ 22.039343][ T1833] systemd-coredump[1833]: Module libsystemd-shared-257.6-1.fc42.so from rpm systemd-257.6-1.fc42.ppc64le
> [ 22.039378][ T1833] systemd-coredump[1833]: Stack trace of thread 1828:
> [ 22.039378][ T1833] systemd-coredump[1833]: Stack trace of thread 1828:
> [ 22.039401][ T1833] systemd-coredump[1833]: #0 0x00007fffa4c29484 abort (libc.so.6 + 0x29484)
> [ 22.039401][ T1833] systemd-coredump[1833]: #0 0x00007fffa4c29484 abort (libc.so.6 + 0x29484)
> [ 22.039429][ T1833] systemd-coredump[1833]: #1 0x00007fffa4c9e00c __libc_message_impl (libc.so.6 + 0x9e00c)
> [ 22.039429][ T1833] systemd-coredump[1833]: #1 0x00007fffa4c9e00c __libc_message_impl (libc.so.6 + 0x9e00c)
> [ 22.039461][ T1833] systemd-coredump[1833]: #2 0x00007fffa4c9e06c __libc_fatal (libc.so.6 + 0x9e06c)
> [ 22.039461][ T1833] systemd-coredump[1833]: #2 0x00007fffa4c9e06c __libc_fatal (libc.so.6 + 0x9e06c)
> [ 22.039491][ T1833] systemd-coredump[1833]: #3 0x00007fffa4cadffc start_thread (libc.so.6 + 0xadffc)
> [ 22.039491][ T1833] systemd-coredump[1833]: #3 0x00007fffa4cadffc start_thread (libc.so.6 + 0xadffc)
> [ 22.039521][ T1833] systemd-coredump[1833]: #4 0x00007fffa4d52d68 __clone (libc.so.6 + 0x152d68)
> [ 22.039521][ T1833] systemd-coredump[1833]: #4 0x00007fffa4d52d68 __clone (libc.so.6 + 0x152d68)
> [ 22.039551][ T1833] systemd-coredump[1833]: #5 0x00007fffa4d52d68 __clone (libc.so.6 + 0x152d68)
> [ 22.039551][ T1833] systemd-coredump[1833]: #5 0x00007fffa4d52d68 __clone (libc.so.6 + 0x152d68)
> [ 22.039580][ T1833] systemd-coredump[1833]: #6 0x00007fffa4cad9c8 create_thread.constprop.0 (libc.so.6 + 0xad9c8)
> [ 22.039580][ T1833] systemd-coredump[1833]: #6 0x00007fffa4cad9c8 create_thread.constprop.0 (libc.so.6 + 0xad9c8)
> [ 22.039614][ T1833] systemd-coredump[1833]: #7 0x00000000003af858 n/a (n/a + 0x0)
> [ 22.039614][ T1833] systemd-coredump[1833]: #7 0x00000000003af858 n/a (n/a + 0x0)
> [ 22.039639][ T1833] systemd-coredump[1833]: ELF object binary architecture: PowerPC64
> [ 22.039639][ T1833] systemd-coredump[1833]: ELF object binary architecture: PowerPC64
> [ 22.042109][ T1] systemd[1]: systemd-journald.service: Scheduled restart job, restart counter is at 1.
I was looking at merge patch and It is possible that TIF_SYSCALL_RET is still set when it is returned
and maybe causing a mismatch.
Does below help?
---
--- a/arch/powerpc/kernel/syscall.c
+++ b/arch/powerpc/kernel/syscall.c
@@ -19,8 +19,10 @@ notrace long system_call_exception(struct pt_regs *regs, unsigned long r0)
long ret;
syscall_fn f;
- if (unlikely(!syscall_enter_from_user_mode_randomize_stack(regs, &r0)))
+ if (unlikely(!syscall_enter_from_user_mode_randomize_stack(regs, &r0))) {
+ clear_thread_flag(TIF_SYSCALL_RET);
return syscall_get_error(current, regs);
+ }
if (unlikely(test_and_clear_thread_flag(TIF_SYSCALL_RET)))
return syscall_get_error(current, regs);
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: powerpc: userspace processes crash on abort() from libc.so.6
2026-08-27 11:38 ` Shrikanth Hegde
@ 2026-08-27 14:16 ` Shivaprasad G Bhat
0 siblings, 0 replies; 3+ messages in thread
From: Shivaprasad G Bhat @ 2026-08-27 14:16 UTC (permalink / raw)
To: Shrikanth Hegde, linuxppc-dev, tglx
Cc: linux-kernel, maddy, christophe.leroy, riteshh
Hi Shrikanth,
On 8/27/26 5:08 PM, Shrikanth Hegde wrote:
> Hi Shivaprasad.
>
> On 8/27/26 11:13 AM, Shivaprasad G Bhat wrote:
>>
>> Hi All, Thomas,
>>
>> On my PPC64 machine, I see the below systemd crash orginating from
>> abort() during boot on top of the tree. Complete dmesg can be seen
>> here [1]
>> abort (libc.so.6 + 0x29484)
>> __libc_message_impl (libc.so.6 + 0x9e00c)
>> __libc_fatal (libc.so.6 + 0x9e06c)
>> start_thread (libc.so.6 + 0xadffc)
>> __clone (libc.so.6 + 0x152d68)
>> __clone (libc.so.6 + 0x152d68)
>> create_thread.constprop.0 (libc.so.6 + 0xad9c8)
>>
>> The git bisect pointed me to commit 3424d8c18a7da "(Merge tag 'core-
>> entry-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/
>> tip/tip)"
>>
>> Please find the kernel config used to build the kernel at [2].
>>
>> I have tried applying the pending fixes from Mukesh [3] and Ritesh [4]
>> for the currently outstanding issues and still see the problem.
>>
>> The system is running Fedora 42, with glibc-2.41-7.fc42.ppc64le. The
>> complete list of toolchain and packages can be found here [5]
>>
>> Thanks and Regards,
>> Shivaprasad
>>
>> References:
>> 1 - https://gist.github.com/
>> shivaprasadbhat/6f166374bab12b4f4c1cd4ac829e562c
>> 2 - https://gist.github.com/shivaprasadbhat/
>> aa499468e124015eec5932fb13e88e05
>> 3 - https://lore.kernel.org/linuxppc-dev/
>> lda1jyut.ritesh.list@gmail.com/#t
>> 4 - https://lore.kernel.org/linuxppc-dev/20260820134718.2176411-1-
>> mkchauras@gmail.com/
>> 5 - https://gist.github.com/shivaprasadbhat/
>> ae56ca849c3009e8642a6313dc465ea7
>>
>> =========
>> Backtrace from dmesg:
>> [ 22.039343][ T1833] systemd-coredump[1833]: Module libsystemd-
>> shared-257.6-1.fc42.so from rpm systemd-257.6-1.fc42.ppc64le
>> [ 22.039378][ T1833] systemd-coredump[1833]: Stack trace of thread
>> 1828:
>> [ 22.039378][ T1833] systemd-coredump[1833]: Stack trace of thread
>> 1828:
>> [ 22.039401][ T1833] systemd-coredump[1833]: #0 0x00007fffa4c29484
>> abort (libc.so.6 + 0x29484)
>> [ 22.039401][ T1833] systemd-coredump[1833]: #0 0x00007fffa4c29484
>> abort (libc.so.6 + 0x29484)
>> [ 22.039429][ T1833] systemd-coredump[1833]: #1 0x00007fffa4c9e00c
>> __libc_message_impl (libc.so.6 + 0x9e00c)
>> [ 22.039429][ T1833] systemd-coredump[1833]: #1 0x00007fffa4c9e00c
>> __libc_message_impl (libc.so.6 + 0x9e00c)
>> [ 22.039461][ T1833] systemd-coredump[1833]: #2 0x00007fffa4c9e06c
>> __libc_fatal (libc.so.6 + 0x9e06c)
>> [ 22.039461][ T1833] systemd-coredump[1833]: #2 0x00007fffa4c9e06c
>> __libc_fatal (libc.so.6 + 0x9e06c)
>> [ 22.039491][ T1833] systemd-coredump[1833]: #3 0x00007fffa4cadffc
>> start_thread (libc.so.6 + 0xadffc)
>> [ 22.039491][ T1833] systemd-coredump[1833]: #3 0x00007fffa4cadffc
>> start_thread (libc.so.6 + 0xadffc)
>> [ 22.039521][ T1833] systemd-coredump[1833]: #4 0x00007fffa4d52d68
>> __clone (libc.so.6 + 0x152d68)
>> [ 22.039521][ T1833] systemd-coredump[1833]: #4 0x00007fffa4d52d68
>> __clone (libc.so.6 + 0x152d68)
>> [ 22.039551][ T1833] systemd-coredump[1833]: #5 0x00007fffa4d52d68
>> __clone (libc.so.6 + 0x152d68)
>> [ 22.039551][ T1833] systemd-coredump[1833]: #5 0x00007fffa4d52d68
>> __clone (libc.so.6 + 0x152d68)
>> [ 22.039580][ T1833] systemd-coredump[1833]: #6 0x00007fffa4cad9c8
>> create_thread.constprop.0 (libc.so.6 + 0xad9c8)
>> [ 22.039580][ T1833] systemd-coredump[1833]: #6 0x00007fffa4cad9c8
>> create_thread.constprop.0 (libc.so.6 + 0xad9c8)
>> [ 22.039614][ T1833] systemd-coredump[1833]: #7 0x00000000003af858
>> n/a (n/a + 0x0)
>> [ 22.039614][ T1833] systemd-coredump[1833]: #7 0x00000000003af858
>> n/a (n/a + 0x0)
>> [ 22.039639][ T1833] systemd-coredump[1833]: ELF object binary
>> architecture: PowerPC64
>> [ 22.039639][ T1833] systemd-coredump[1833]: ELF object binary
>> architecture: PowerPC64
>> [ 22.042109][ T1] systemd[1]: systemd-journald.service: Scheduled
>> restart job, restart counter is at 1.
>
> I was looking at merge patch and It is possible that TIF_SYSCALL_RET is
> still set when it is returned
> and maybe causing a mismatch.
>
> Does below help?
> ---
>
> --- a/arch/powerpc/kernel/syscall.c
> +++ b/arch/powerpc/kernel/syscall.c
> @@ -19,8 +19,10 @@ notrace long system_call_exception(struct pt_regs
> *regs, unsigned long r0)
> long ret;
> syscall_fn f;
>
> - if (unlikely(!syscall_enter_from_user_mode_randomize_stack(regs,
> &r0)))
> + if (unlikely(!syscall_enter_from_user_mode_randomize_stack(regs,
> &r0))) {
> + clear_thread_flag(TIF_SYSCALL_RET);
Yes. This worked.
Thanks,
Shivaprasad> return syscall_get_error(current, regs);
> + }
>
> if (unlikely(test_and_clear_thread_flag(TIF_SYSCALL_RET)))
> return syscall_get_error(current, regs);
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2026-08-27 14:16 UTC | newest]
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2026-08-27 5:43 powerpc: userspace processes crash on abort() from libc.so.6 Shivaprasad G Bhat
2026-08-27 11:38 ` Shrikanth Hegde
2026-08-27 14:16 ` Shivaprasad G Bhat
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