linux-kernel - [bug?] s390: kernel panic on specification exception: 0006

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Message-ID: <4f3768be36e0298be4ceebd4fdd3e96dd4fbdc04@linux.dev>
Date: Thu, 15 May 2025 19:04:20 +0000
From: "Ihor Solodrai" <ihor.solodrai@...ux.dev>
To: linux-s390@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: [bug?] s390: kernel panic on specification exception: 0006

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.