From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f208.google.com (mail-oi1-f208.google.com [209.85.167.208]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6AB96248F72 for ; Mon, 15 Jun 2026 07:39:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781509171; cv=none; b=uZSToY7x/JGRCvRU73kFRF5goOUWXZtemVsh2VJWWG89H+KvFK/Jlcr8uLXJlw8SD8REJfFwjiubhQitiUZODlXzmDu3YplV3pEB41dAWcaJjB8C97kWGewWdiL1Ds2V8K/tgBDWsX/YW8DRDuIbydBOIG8EI/3qX1spqt6i5ek= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781509171; c=relaxed/simple; bh=TlVBy0ctkOPPT0J0MttbNXCiwPHzWWxWntnvr/+00Cg=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=tCZOM/jK7CE2uWD6SOK1qlYHeq1HidbH7LvPktovcMKHPnir7zbKD9lPSF8r8gx9wVJFeNhJB3HuA33SizGuYJW8fbtWWRu6vPpNPSWX76h/GOY/OeG9ppmb2LlVWhNk5ROEjvmuQn+Ea8gzVUz9ozTrlAs9vgCHcJkWUBpir6A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.167.208 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oi1-f208.google.com with SMTP id 5614622812f47-486a2231742so5802933b6e.1 for ; Mon, 15 Jun 2026 00:39:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1781509169; x=1782113969; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=G4JPDB2ZGsdFclRDC7Bd47qebrO6Y3mwwYs97ohAGM4=; b=I1WkdHTY5RPgvUThkimKS3DfkUviw8YYYhuuUZWmf/MdMSqzI8he0EP/mXAYYyoSta GQ0n+LuC5hTDU0TpvsxRfKsnjfem8RCka2OpmuozGG117sHYvjhGIvCuawu2AL07ouae vvzwksDqJPR8HXQL9fx2BmVRm4p9KLQx0Vt80BTjGdOuncSRx3ESRIQZ7rIAmCUe5lyl YnerqPq89ORGbOEZH43g+A0uI7wSBJKGSWDPM3fTkvWhshexK4EwJRDXS9xwL8U5PROq wqIhhViZohEsa2bevvC2x4kmngCriSLQABEWL19O6iva9DCGSPRVClr1lLa7zstjRqkG tzMg== X-Forwarded-Encrypted: i=1; AFNElJ9QkIgjz+evXbNgrpzvcHnI02fpYVojwlgzOb2p8SWMhQNk4bwxN8xe+NWY/0U4u8AEWGTRujIwtb3y4LA=@vger.kernel.org X-Gm-Message-State: AOJu0Yz9Gd6Y2fRpgqjgwcPS0HgL+kxomciWZt9aAkXxXtCODo9BM2vi QTn500CbYE4OTPPPbVGC5DDjflK93n393C/80OwzWPnBKhMRNa+3tJaHGDiHzhGcl//HRFtPiGi Bp+LcLgeVLcKUHtIP0cnj859Gh2XJBGxfVw+WOuXOMcSGwkOe6vJOVRdiM7Y= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1c0d:b0:485:729e:6ac8 with SMTP id 5614622812f47-4872dd9f44dmr7787258b6e.5.1781509169375; Mon, 15 Jun 2026 00:39:29 -0700 (PDT) Date: Mon, 15 Jun 2026 00:39:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a2fac31.be3f099c.2836ae.0017.GAE@google.com> Subject: [syzbot] [kernel?] WARNING in stub_timer (2) From: syzbot To: anna-maria@linutronix.de, frederic@kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 9716c086c8e8 Merge tag 'pm-7.1-rc8' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=120533d2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b4166e8ea5fbf7e3 dashboard link: https://syzkaller.appspot.com/bug?extid=5e8dda76ca21dae314b6 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-9716c086.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c42e123755c8/vmlinux-9716c086.xz kernel image: https://storage.googleapis.com/syzbot-assets/4eb934549042/bzImage-9716c086.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5e8dda76ca21dae314b6@syzkaller.appspotmail.com ------------[ cut here ]------------ 1 WARNING: kernel/time/hrtimer.c:443 at stub_timer+0xa/0x20 kernel/time/timer.c:716, CPU#0: udevd/4706 Modules linked in: CPU: 0 UID: 0 PID: 4706 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:stub_timer+0xa/0x20 kernel/time/timer.c:716 Code: cc 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa e8 d7 1a 13 00 90 <0f> 0b 90 31 c0 c3 cc cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 RSP: 0018:ffffc90000007dd0 EFLAGS: 00010006 RAX: ffffffff81b2ac39 RBX: 1ffff11000046617 RCX: ffff888000232540 RDX: 0000000000010000 RSI: ffffffff8c28d0c0 RDI: ffffc9000255fb20 RBP: ffffc9000255fb20 R08: ffffffff90305bf7 R09: 1ffffffff2060b7e R10: dffffc0000000000 R11: ffffffff81b2ac30 R12: ffff8880002330b8 R13: 1ffff11003f8506a R14: dffffc0000000000 R15: ffffffff81b2ac30 FS: 00007f6e41fb1880(0000) GS:ffff88808c894000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005589b464e660 CR3: 00000000128d0000 CR4: 0000000000352ef0 Call Trace: __run_hrtimer kernel/time/hrtimer.c:1930 [inline] __hrtimer_run_queues+0x3c0/0xa20 kernel/time/hrtimer.c:1994 hrtimer_interrupt+0x44b/0x950 kernel/time/hrtimer.c:2113 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198 Code: f7 e8 ad 28 f6 f5 f7 c3 00 02 00 00 74 05 e8 20 d2 21 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 c4 a7 e7 f5 65 8b 05 8d 9d 8c 07 85 c0 74 18 5b 41 5e c3 cc cc RSP: 0018:ffffc9000255fac8 EFLAGS: 00000206 RAX: 0000000000000006 RBX: 0000000000000246 RCX: 0000000080000001 RDX: 0000000000000000 RSI: ffffffff8dfa9d91 RDI: 0000000000000001 RBP: ffffc9000255fbf0 R08: ffffffff90305bf7 R09: 1ffffffff2060b7e R10: dffffc0000000000 R11: fffffbfff2060b7f R12: 1ffff920004abfae R13: 1ffff920004abf60 R14: ffff88801fc28280 R15: dffffc0000000000 schedule_hrtimeout_range_clock+0x142/0x330 kernel/time/sleep_timeout.c:213 ep_poll fs/eventpoll.c:2030 [inline] do_epoll_wait+0xd36/0xf60 fs/eventpoll.c:2464 __do_sys_epoll_wait fs/eventpoll.c:2472 [inline] __se_sys_epoll_wait fs/eventpoll.c:2467 [inline] __x64_sys_epoll_wait+0x1d7/0x230 fs/eventpoll.c:2467 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6e418a7407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffe8bec5c00 EFLAGS: 00000202 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 00007f6e41fb1880 RCX: 00007f6e418a7407 RDX: 0000000000000008 RSI: 00007ffe8bec5d60 RDI: 000000000000000b RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000bb8 R11: 0000000000000202 R12: 0000000000000000 R13: 0000556a1ef48100 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: f7 e8 imul %eax 2: ad lods %ds:(%rsi),%eax 3: 28 f6 sub %dh,%dh 5: f5 cmc 6: f7 c3 00 02 00 00 test $0x200,%ebx c: 74 05 je 0x13 e: e8 20 d2 21 f6 call 0xf621d233 13: 9c pushf 14: 58 pop %rax 15: a9 00 02 00 00 test $0x200,%eax 1a: 75 27 jne 0x43 1c: f7 c3 00 02 00 00 test $0x200,%ebx 22: 74 01 je 0x25 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 c4 a7 e7 f5 call 0xf5e7a7f3 <-- trapping instruction 2f: 65 8b 05 8d 9d 8c 07 mov %gs:0x78c9d8d(%rip),%eax # 0x78c9dc3 36: 85 c0 test %eax,%eax 38: 74 18 je 0x52 3a: 5b pop %rbx 3b: 41 5e pop %r14 3d: c3 ret 3e: cc int3 3f: cc int3 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup