* [mainline] Kernel OOPs while running powerpc/mce/ selftest
@ 2025-10-23 4:54 Venkat Rao Bagalkote
2025-11-05 13:45 ` Christophe Leroy
0 siblings, 1 reply; 3+ messages in thread
From: Venkat Rao Bagalkote @ 2025-10-23 4:54 UTC (permalink / raw)
To: linuxppc-dev, LKML, Madhavan Srinivasan
Greetings!!!
IBM CI has reported a kernel crash while running mce selftests on
mainline kernel, from tools/testing/selftests/powerpc/mce/.
This issue is hit when CONFIG_KASAN is enabled. If its disabled, test
passes.
Traces:
[ 8041.225432] BUG: Unable to handle kernel data access on read at
0xc00e0001a1ad6103
[ 8041.225453] Faulting instruction address: 0xc0000000008c54d8
[ 8041.225461] Oops: Kernel access of bad area, sig: 11 [#1]
[ 8041.225467] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=8192 NUMA pSeries
[ 8041.225475] Modules linked in: nft_fib_inet nft_fib_ipv4 nft_fib_ipv6
nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct
nft_chain_nat nf_nat nf_conntrack bonding tls nf_defrag_ipv6
nf_defrag_ipv4 rfkill ip_set nf_tables nfnetlink pseries_rng vmx_crypto
dax_pmem fuse ext4 crc16 mbcache jbd2 nd_pmem papr_scm sd_mod libnvdimm
sg ibmvscsi ibmveth scsi_transport_srp pseries_wdt
[ 8041.225558] CPU: 17 UID: 0 PID: 877869 Comm: inject-ra-err Kdump:
loaded Not tainted 6.18.0-rc2+ #1 VOLUNTARY
[ 8041.225569] Hardware name: IBM,9080-HEX Power11 (architected)
0x820200 0xf000007 of:IBM,FW1110.01 (NH1110_069) hv:phyp pSeries
[ 8041.225576] NIP: c0000000008c54d8 LR: c00000000004e464 CTR:
0000000000000000
[ 8041.225583] REGS: c0000000fff778d0 TRAP: 0300 Not tainted (6.18.0-rc2+)
[ 8041.225590] MSR: 8000000000001003 <SF,ME,RI,LE> CR: 48002828 XER:
00000000
[ 8041.225607] CFAR: c00000000004e460 DAR: c00e0001a1ad6103 DSISR:
40000000 IRQMASK: 3
[ 8041.225607] GPR00: c0000000019d0598 c0000000fff77b70 c00000000244a400
c000000d0d6b0818
[ 8041.225607] GPR04: 0000000000004d43 0000000000000008 c00000000004e464
004d424900000000
[ 8041.225607] GPR08: 0000000000000001 18000001a1ad6103 a80e000000000000
0000000003000048
[ 8041.225607] GPR12: 0000000000000000 c000000d0ddf3300 0000000000000000
0000000000000000
[ 8041.225607] GPR16: 0000000000000000 0000000000000000 0000000000000000
0000000000000000
[ 8041.225607] GPR20: 0000000000000000 0000000000000000 0000000000000000
0000000000000000
[ 8041.225607] GPR24: 0000000000000000 0000000000000000 0000000000000000
0000000000000000
[ 8041.225607] GPR28: c000000d0d6b0888 c000000d0d6b0800 0000000000004d43
c000000d0d6b0818
[ 8041.225701] NIP [c0000000008c54d8] __asan_load2+0x54/0xd8
[ 8041.225712] LR [c00000000004e464] pseries_errorlog_id+0x20/0x3c
[ 8041.225722] Call Trace:
[ 8041.225726] [c0000000fff77b90] [c0000000001f8748]
fwnmi_get_errinfo+0xd4/0x104
[ 8041.225738] [c0000000fff77bc0] [c0000000019d0598]
get_pseries_errorlog+0xa8/0x110
[ 8041.225750] [c0000000fff77c00] [c0000000001f8f68]
pseries_machine_check_realmode+0x11c/0x214
[ 8041.225762] [c0000000fff77ce0] [c000000000049ca4]
machine_check_early+0x74/0xc0
[ 8041.225771] [c0000000fff77d30] [c0000000000084a4]
machine_check_early_common+0x1b4/0x2c0
[ 8041.225782] ---- interrupt: 200 at 0x100105cc
[ 8041.225788] NIP: 00000000100105cc LR: 00000000100105c4 CTR:
0000000000000000
[ 8041.225795] REGS: c0000000fff77d60 TRAP: 0200 Not tainted (6.18.0-rc2+)
[ 8041.225801] MSR: 8000000002a0f033
<SF,VEC,VSX,EE,PR,FP,ME,IR,DR,RI,LE> CR: 84002822 XER: 00000000
[ 8041.225829] CFAR: 000000000000021c DAR: 00007fffa0a40000 DSISR:
02000008 IRQMASK: 0
[ 8041.225829] GPR00: 00000000100105c4 00007fffdaa5bd20 0000000010047f00
00007fffa0a40000
[ 8041.225829] GPR04: 0000000000001000 0000000000000003 0000000000000001
0000000000000005
[ 8041.225829] GPR08: 0000000000000000 fffffffffffff000 0000000000000000
0000000000000000
[ 8041.225829] GPR12: 0000000000000000 00007fffa0b3ad20 0000000000000000
0000000000000000
[ 8041.225829] GPR16: 0000000000000000 0000000000000000 0000000000000000
0000000000000000
[ 8041.225829] GPR20: 0000000000000000 0000000000000000 0000000000000000
00000000100102c0
[ 8041.225829] GPR24: 00007fffa0b30000 00007fffa0b2f6c0 00007fffdaa5c408
000000001003fce8
[ 8041.225829] GPR28: 00007fffdaa5c658 0000000000000001 0000000000000005
0000000000000000
[ 8041.225919] NIP [00000000100105cc] 0x100105cc
[ 8041.225925] LR [00000000100105c4] 0x100105c4
[ 8041.225930] ---- interrupt: 200
[ 8041.225934] Code: 6129ffff 792907c6 6529ffff 6129ffff 7c234840
40810058 39230001 3d40a80e 71280007 41820034 7929e8c2 794a07c6
<7d2950ae> 7d290775 40820070 38210020
[ 8041.225969] ---[ end trace 0000000000000000 ]---
If you happen to fix this issue, please add below tag.
Reported-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Regards,
Venkat.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [mainline] Kernel OOPs while running powerpc/mce/ selftest
2025-10-23 4:54 [mainline] Kernel OOPs while running powerpc/mce/ selftest Venkat Rao Bagalkote
@ 2025-11-05 13:45 ` Christophe Leroy
2025-11-06 8:06 ` Venkat Rao Bagalkote
0 siblings, 1 reply; 3+ messages in thread
From: Christophe Leroy @ 2025-11-05 13:45 UTC (permalink / raw)
To: Venkat Rao Bagalkote, linuxppc-dev, LKML, Madhavan Srinivasan,
Ganesh Goudar, Nathan Lynch
Le 23/10/2025 à 06:54, Venkat Rao Bagalkote a écrit :
> Greetings!!!
>
>
> IBM CI has reported a kernel crash while running mce selftests on
> mainline kernel, from tools/testing/selftests/powerpc/mce/.
>
>
> This issue is hit when CONFIG_KASAN is enabled. If its disabled, test
> passes.
>
>
> Traces:
>
>
> [ 8041.225432] BUG: Unable to handle kernel data access on read at
> 0xc00e0001a1ad6103
> [ 8041.225453] Faulting instruction address: 0xc0000000008c54d8
> [ 8041.225461] Oops: Kernel access of bad area, sig: 11 [#1]
> [ 8041.225467] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=8192 NUMA pSeries
> [ 8041.225475] Modules linked in: nft_fib_inet nft_fib_ipv4 nft_fib_ipv6
> nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct
> nft_chain_nat nf_nat nf_conntrack bonding tls nf_defrag_ipv6
> nf_defrag_ipv4 rfkill ip_set nf_tables nfnetlink pseries_rng vmx_crypto
> dax_pmem fuse ext4 crc16 mbcache jbd2 nd_pmem papr_scm sd_mod libnvdimm
> sg ibmvscsi ibmveth scsi_transport_srp pseries_wdt
> [ 8041.225558] CPU: 17 UID: 0 PID: 877869 Comm: inject-ra-err Kdump:
> loaded Not tainted 6.18.0-rc2+ #1 VOLUNTARY
> [ 8041.225569] Hardware name: IBM,9080-HEX Power11 (architected)
> 0x820200 0xf000007 of:IBM,FW1110.01 (NH1110_069) hv:phyp pSeries
> [ 8041.225576] NIP: c0000000008c54d8 LR: c00000000004e464 CTR:
> 0000000000000000
> [ 8041.225583] REGS: c0000000fff778d0 TRAP: 0300 Not tainted (6.18.0-
> rc2+)
> [ 8041.225590] MSR: 8000000000001003 <SF,ME,RI,LE> CR: 48002828 XER:
> 00000000
> [ 8041.225607] CFAR: c00000000004e460 DAR: c00e0001a1ad6103 DSISR:
> 40000000 IRQMASK: 3
> [ 8041.225607] GPR00: c0000000019d0598 c0000000fff77b70 c00000000244a400
> c000000d0d6b0818
> [ 8041.225607] GPR04: 0000000000004d43 0000000000000008 c00000000004e464
> 004d424900000000
> [ 8041.225607] GPR08: 0000000000000001 18000001a1ad6103 a80e000000000000
> 0000000003000048
> [ 8041.225607] GPR12: 0000000000000000 c000000d0ddf3300 0000000000000000
> 0000000000000000
> [ 8041.225607] GPR16: 0000000000000000 0000000000000000 0000000000000000
> 0000000000000000
> [ 8041.225607] GPR20: 0000000000000000 0000000000000000 0000000000000000
> 0000000000000000
> [ 8041.225607] GPR24: 0000000000000000 0000000000000000 0000000000000000
> 0000000000000000
> [ 8041.225607] GPR28: c000000d0d6b0888 c000000d0d6b0800 0000000000004d43
> c000000d0d6b0818
> [ 8041.225701] NIP [c0000000008c54d8] __asan_load2+0x54/0xd8
> [ 8041.225712] LR [c00000000004e464] pseries_errorlog_id+0x20/0x3c
> [ 8041.225722] Call Trace:
> [ 8041.225726] [c0000000fff77b90] [c0000000001f8748]
> fwnmi_get_errinfo+0xd4/0x104
> [ 8041.225738] [c0000000fff77bc0] [c0000000019d0598]
> get_pseries_errorlog+0xa8/0x110
> [ 8041.225750] [c0000000fff77c00] [c0000000001f8f68]
> pseries_machine_check_realmode+0x11c/0x214
> [ 8041.225762] [c0000000fff77ce0] [c000000000049ca4]
> machine_check_early+0x74/0xc0
> [ 8041.225771] [c0000000fff77d30] [c0000000000084a4]
> machine_check_early_common+0x1b4/0x2c0
Is it a new problem or has it always been there ?
The problem is because KASAN is not compatible with realmode (MMU
translation is OFF).
pseries_machine_check_realmode() is located in
arch/powerpc/platforms/pseries/ras.c built with KASAN_SANITIZE_ras.o := n
But pseries_machine_check_realmode() calls mce_handle_error() which
calls get_pseries_errorlog().
get_pseries_errorlog() is in arch/powerpc/kernel/rtas.c which is _not_
built with KASAN_SANITIZE disabled hence the Oops.
Unrelated, but it looks like there is also a problem with commit
cc15ff327569 ("powerpc/mce: Avoid using irq_work_queue() in realmode"),
which removed the re-enabling of translation but left the call to
mce_handle_err_virtmode().
Christophe
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [mainline] Kernel OOPs while running powerpc/mce/ selftest
2025-11-05 13:45 ` Christophe Leroy
@ 2025-11-06 8:06 ` Venkat Rao Bagalkote
0 siblings, 0 replies; 3+ messages in thread
From: Venkat Rao Bagalkote @ 2025-11-06 8:06 UTC (permalink / raw)
To: Christophe Leroy, linuxppc-dev, LKML, Madhavan Srinivasan,
Ganesh Goudar, Nathan Lynch
On 05/11/25 7:15 pm, Christophe Leroy wrote:
>
>
> Le 23/10/2025 à 06:54, Venkat Rao Bagalkote a écrit :
>> Greetings!!!
>>
>>
>> IBM CI has reported a kernel crash while running mce selftests on
>> mainline kernel, from tools/testing/selftests/powerpc/mce/.
>>
>>
>> This issue is hit when CONFIG_KASAN is enabled. If its disabled, test
>> passes.
>>
>>
>> Traces:
>>
>>
>> [ 8041.225432] BUG: Unable to handle kernel data access on read at
>> 0xc00e0001a1ad6103
>> [ 8041.225453] Faulting instruction address: 0xc0000000008c54d8
>> [ 8041.225461] Oops: Kernel access of bad area, sig: 11 [#1]
>> [ 8041.225467] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=8192 NUMA pSeries
>> [ 8041.225475] Modules linked in: nft_fib_inet nft_fib_ipv4
>> nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6
>> nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack bonding tls
>> nf_defrag_ipv6 nf_defrag_ipv4 rfkill ip_set nf_tables nfnetlink
>> pseries_rng vmx_crypto dax_pmem fuse ext4 crc16 mbcache jbd2 nd_pmem
>> papr_scm sd_mod libnvdimm sg ibmvscsi ibmveth scsi_transport_srp
>> pseries_wdt
>> [ 8041.225558] CPU: 17 UID: 0 PID: 877869 Comm: inject-ra-err Kdump:
>> loaded Not tainted 6.18.0-rc2+ #1 VOLUNTARY
>> [ 8041.225569] Hardware name: IBM,9080-HEX Power11 (architected)
>> 0x820200 0xf000007 of:IBM,FW1110.01 (NH1110_069) hv:phyp pSeries
>> [ 8041.225576] NIP: c0000000008c54d8 LR: c00000000004e464 CTR:
>> 0000000000000000
>> [ 8041.225583] REGS: c0000000fff778d0 TRAP: 0300 Not tainted
>> (6.18.0- rc2+)
>> [ 8041.225590] MSR: 8000000000001003 <SF,ME,RI,LE> CR: 48002828
>> XER: 00000000
>> [ 8041.225607] CFAR: c00000000004e460 DAR: c00e0001a1ad6103 DSISR:
>> 40000000 IRQMASK: 3
>> [ 8041.225607] GPR00: c0000000019d0598 c0000000fff77b70
>> c00000000244a400 c000000d0d6b0818
>> [ 8041.225607] GPR04: 0000000000004d43 0000000000000008
>> c00000000004e464 004d424900000000
>> [ 8041.225607] GPR08: 0000000000000001 18000001a1ad6103
>> a80e000000000000 0000000003000048
>> [ 8041.225607] GPR12: 0000000000000000 c000000d0ddf3300
>> 0000000000000000 0000000000000000
>> [ 8041.225607] GPR16: 0000000000000000 0000000000000000
>> 0000000000000000 0000000000000000
>> [ 8041.225607] GPR20: 0000000000000000 0000000000000000
>> 0000000000000000 0000000000000000
>> [ 8041.225607] GPR24: 0000000000000000 0000000000000000
>> 0000000000000000 0000000000000000
>> [ 8041.225607] GPR28: c000000d0d6b0888 c000000d0d6b0800
>> 0000000000004d43 c000000d0d6b0818
>> [ 8041.225701] NIP [c0000000008c54d8] __asan_load2+0x54/0xd8
>> [ 8041.225712] LR [c00000000004e464] pseries_errorlog_id+0x20/0x3c
>> [ 8041.225722] Call Trace:
>> [ 8041.225726] [c0000000fff77b90] [c0000000001f8748]
>> fwnmi_get_errinfo+0xd4/0x104
>> [ 8041.225738] [c0000000fff77bc0] [c0000000019d0598]
>> get_pseries_errorlog+0xa8/0x110
>> [ 8041.225750] [c0000000fff77c00] [c0000000001f8f68]
>> pseries_machine_check_realmode+0x11c/0x214
>> [ 8041.225762] [c0000000fff77ce0] [c000000000049ca4]
>> machine_check_early+0x74/0xc0
>> [ 8041.225771] [c0000000fff77d30] [c0000000000084a4]
>> machine_check_early_common+0x1b4/0x2c0
>
> Is it a new problem or has it always been there ?
Its not a new problem. I have enabled KASAN recently in the config, and
then I started seeing this issue.
I have tested on 6.17, 6.16 and 6.15 kernels and issues is there all along.
Regards,
Venkat.
>
> The problem is because KASAN is not compatible with realmode (MMU
> translation is OFF).
>
> pseries_machine_check_realmode() is located in
> arch/powerpc/platforms/pseries/ras.c built with KASAN_SANITIZE_ras.o := n
>
> But pseries_machine_check_realmode() calls mce_handle_error() which
> calls get_pseries_errorlog().
>
> get_pseries_errorlog() is in arch/powerpc/kernel/rtas.c which is _not_
> built with KASAN_SANITIZE disabled hence the Oops.
>
> Unrelated, but it looks like there is also a problem with commit
> cc15ff327569 ("powerpc/mce: Avoid using irq_work_queue() in
> realmode"), which removed the re-enabling of translation but left the
> call to mce_handle_err_virtmode().
>
> Christophe
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2025-10-23 4:54 [mainline] Kernel OOPs while running powerpc/mce/ selftest Venkat Rao Bagalkote
2025-11-05 13:45 ` Christophe Leroy
2025-11-06 8:06 ` Venkat Rao Bagalkote
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