From: Heiko Carstens <hca@linux.ibm.com>
To: Ihor Solodrai <ihor.solodrai@linux.dev>,
Ilya Leoshkevich <iii@linux.ibm.com>
Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
bpf@vger.kernel.org
Subject: Re: [bug?] s390: kernel panic on specification exception: 0006
Date: Tue, 20 May 2025 11:47:05 +0200 [thread overview]
Message-ID: <20250520094705.7932Bc3-hca@linux.ibm.com> (raw)
In-Reply-To: <4f3768be36e0298be4ceebd4fdd3e96dd4fbdc04@linux.dev>
[full quote, and adding Ilya]
On Thu, May 15, 2025 at 07:04:20PM +0000, Ihor Solodrai wrote:
> Hi everyone.
>
> Stumbled on the following while testing unrelated changes to BPF CI scripts:
>
> #353 select_reuseport:OK
> specification exception: 0006 ilc:2 [#1]SMP
> Modules linked in: bpf_testmod(OE) [last unloaded: bpf_test_modorder_x(OE)]
> CPU: 0 UID: 0 PID: 108 Comm: new_name Tainted: G OE 6.15.0-rc4-g169491540638-dirty #1 NONE
> Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
> Hardware name: IBM 8561 LT1 400 (KVM/Linux)
> Krnl PSW : 0404e00180000000 000001e43ac595e4 (hrtimer_interrupt+0x4/0x2a0)
> R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3
> Krnl GPRS: 7fffffffffffffff 000001e43ac595e0 00000000fff8f200 000001e43c52a0c0
> 00000164c50740d8 0000000000000000 0000000000000000 0000000000000000
> 0000000000000000 0000000000000000 000001643afabe00 0000000000000000
> 000003ff9fbadf98 000001e43b747550 000001e43ab12774 00000000fffdfe68
> Krnl Code:#000001e43ac595e0: 67756573 mxd %f7,1395(%r5,%r6)
> >000001e43ac595e4: 743d696e unknown
> 000001e43ac595e8: 73303031 unknown
> 000001e43ac595ec: 61652c64 unknown
> 000001e43ac595f0: 65627567 unknown
> 000001e43ac595f4: 2d74 ddr %f7,%f4
> 000001e43ac595f6: 68726561 ld %f7,1377(%r2,%r6)
> 000001e43ac595fa: 64733d6f unknown
> Call Trace:
> [<000001e43ac595e4>] hrtimer_interrupt+0x4/0x2a0
> [<000001e43ab128ca>] do_irq_async+0x5a/0x78
> [<000001e43b65f694>] do_ext_irq+0xac/0x168
> [<000001e43b66ae90>] ext_int_handler+0xc8/0xf8
> Last Breaking-Event-Address:
> [<000001e43ab08a9e>] clock_comparator_work+0x2e/0x30
> Kernel panic - not syncing: Fatal exception in interrupt
>
> This is on the current tip of bpf-next (9325d53fe9ad).
>
> Job: https://github.com/kernel-patches/vmtest/actions/runs/15051985809/job/42309244372
> You can download full logs from there.
>
> It only happened once so far, didn't repeat on restart.
Looks like the text section, which contains the hrtimer_interrupt
function, got corrupted, and an ASCII string was written there.
The hexdump above with the corrupted code translates to the following
ASCII text: "guest=ins001ae,debug-threads=o".
Does that ring a bell?
next prev parent reply other threads:[~2025-05-20 9:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-15 19:04 [bug?] s390: kernel panic on specification exception: 0006 Ihor Solodrai
2025-05-20 9:47 ` Heiko Carstens [this message]
2025-05-20 9:57 ` Ilya Leoshkevich
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