From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3747C3B9943; Sat, 6 Jun 2026 20:06:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780776416; cv=none; b=REVgc6PuDzZs2ElfOeKrNpel+K8Ow0S+P5/ux7BEfo4NhKjmZ4XJr2xMhQf2mdqfiqCpsWRuDKH5q0gIc+X3xOY1553eX+UvZhwgqbqP7kacwsQV9WgAE8DvuGjLcaHLQG420oZ9ZcjfJWlWJW1SYifE1crk8fTljeVEHnvlTPM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780776416; c=relaxed/simple; bh=iKjt7lAdFhshpI9TT4ivazz0Y+qohYQCVYV6npG1dMo=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=jJMF2Oe0Jk5Vl715jsWIu8W/aHlT4vT42RQk2Gbi5P9N3X0eNg6Od04FdDorqAljy50OQtILhAIt+XFao2Ubv3SyWZoEhgNekCba/LqyqgAQqyJXT9BPwItnxGAxroeuqfA1v/6WRfgu2KR0psKXnHo2YKqHHPXaSQCx8UTNWhU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=X8lRIOAC; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="X8lRIOAC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 93AA11F00893; Sat, 6 Jun 2026 20:06:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1780776415; bh=qa5POJ66Fhb7XWJUEzlpeoKcCg4M+FUsDrfjmTiyXQw=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=X8lRIOAC/5y0jTnBZVDufh+G9szVlK547lyO8h5LcLyFWPzMzbDr8NZnDPF9kiZbb Mnwrg9q6MP1QZJSTC6nSLG7euSQUI3jQiHnMWR9Ldb7T77pgOWlTCR0hVQDHFTk7Dl pWpRmwrCmyTiHzqyPfbScM4kKOMyXPuH5baWctQo= Date: Sat, 6 Jun 2026 13:06:54 -0700 From: Andrew Morton To: syzbot Cc: jannh@google.com, liam@infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, pfalcato@suse.de, syzkaller-bugs@googlegroups.com, vbabka@kernel.org, Marcel Holtmann , Luiz Augusto von Dentz , linux-bluetooth@vger.kernel.org Subject: Re: [syzbot] [mm?] upstream test error: WARNING in call_timer_fn Message-Id: <20260606130654.e4374528274cea6ec83397ea@linux-foundation.org> In-Reply-To: <6a246fb8.c25708ab.1b19ef.0009.GAE@google.com> References: <6a246fb8.c25708ab.1b19ef.0009.GAE@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Sat, 06 Jun 2026 12:06:32 -0700 syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: ba3e43a9e601 Merge tag 'soc-fixes-7.1-2' of git://git.kern.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=12180f2e580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=b4166e8ea5fbf7e3 > dashboard link: https://syzkaller.appspot.com/bug?extid=8b331cede7bfea7c674c > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Thanks. > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-ba3e43a9.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/721f1d5136ec/vmlinux-ba3e43a9.xz > kernel image: https://storage.googleapis.com/syzbot-assets/ff33eef1aaee/bzImage-ba3e43a9.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+8b331cede7bfea7c674c@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > workqueue: cannot queue hci_cmd_timeout on wq hci0 Looks like a bluetooth thing. Cc's added. > WARNING: kernel/workqueue.c:2298 at __queue_work+0xd3f/0x1040 kernel/workqueue.c:2296, CPU#0: syz-executor/5425 > Modules linked in: > CPU: 0 UID: 0 PID: 5425 Comm: syz-executor 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:__queue_work+0xd67/0x1040 kernel/workqueue.c:2296 > Code: a6 0e 49 8d 7d 18 48 89 f8 48 c1 e8 03 42 80 3c 20 00 74 05 e8 7a 7b a5 00 49 8b 75 18 49 81 c7 70 01 00 00 4c 89 f7 4c 89 fa <67> 48 0f b9 3a 4c 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ef > RSP: 0000:ffffc90000007bd8 EFLAGS: 00010082 > RAX: 1ffff1100259b94e RBX: 0000000000000008 RCX: ffff8880336a2540 > RDX: ffff888041425170 RSI: ffffffff8a9c7e10 RDI: ffffffff90334eb0 > RBP: 0000000000000100 R08: ffffffff90304ff7 R09: 1ffffffff20609fe > R10: dffffc0000000000 R11: ffffffff818d37e0 R12: dffffc0000000000 > R13: ffff888012cdca58 R14: ffffffff90334eb0 R15: ffff888041425170 > FS: 0000000000000000(0000) GS:ffff88808c891000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000001b2fa63fff CR3: 0000000012c0c000 CR4: 0000000000352ef0 > Call Trace: > > call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748 > expire_timers kernel/time/timer.c:1794 [inline] > __run_timers kernel/time/timer.c:2374 [inline] > __run_timer_base+0x67e/0x8b0 kernel/time/timer.c:2386 > run_timer_base kernel/time/timer.c:2395 [inline] > run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405 > handle_softirqs+0x22a/0x840 kernel/softirq.c:622 > __do_softirq kernel/softirq.c:656 [inline] > invoke_softirq kernel/softirq.c:496 [inline] > __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 > irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 > instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] > sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061 > > > asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 > RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:97 [inline] > RIP: 0010:memory_is_nonzero mm/kasan/generic.c:115 [inline] > RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:140 [inline] > RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline] > RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline] > RIP: 0010:kasan_check_range+0x90/0x2c0 mm/kasan/generic.c:200 > Code: 03 48 bb 01 00 00 00 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 3d 01 00 00 4c 89 cb 48 f7 d3 <4c> 01 fb 41 80 3b 00 0f 85 9e 01 00 00 49 ff c3 48 ff c3 75 ee e9 > RSP: 0000:ffffc9000e2bf240 EFLAGS: 00000202 > RAX: 1ffff92001c57e01 RBX: e00006dffe3a8187 RCX: ffffffff8176f0e3 > RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc9000e2bf3b8 > RBP: 0000000000000000 R08: ffffc9000e2bf3c7 R09: 1ffff92001c57e78 > R10: dffffc0000000000 R11: fffff52001c57e77 R12: 0000000000000002 > R13: 1ffff92001c57e6f R14: fffff52001c57e79 R15: 1ffff92001c57e77 > __asan_memset+0x22/0x50 mm/kasan/shadow.c:84 > unwind_next_frame+0xf33/0x2550 arch/x86/kernel/unwind_orc.c:621 > arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 > stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 > kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 > kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 > __call_rcu_common kernel/rcu/tree.c:3131 [inline] > call_rcu+0xee/0x890 kernel/rcu/tree.c:3251 > slab_free_hook mm/slub.c:2653 [inline] > slab_free mm/slub.c:6251 [inline] > kmem_cache_free+0x462/0x650 mm/slub.c:6378 > tear_down_vmas+0x312/0x520 mm/mmap.c:1262 > exit_mmap+0x4b6/0x9e0 mm/mmap.c:1320 > __mmput+0x118/0x430 kernel/fork.c:1178 > exit_mm+0x1f6/0x2d0 kernel/exit.c:582 > do_exit+0x6a2/0x22c0 kernel/exit.c:964 > do_group_exit+0x21b/0x2d0 kernel/exit.c:1119 > get_signal+0x1284/0x1330 kernel/signal.c:3037 > arch_do_signal_or_restart+0xbc/0x840 arch/x86/kernel/signal.c:337 > __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] > exit_to_user_mode_loop+0xa9/0x680 kernel/entry/common.c:98 > __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] > syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] > syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] > do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f328ef57fd7 > Code: Unable to access opcode bytes at 0x7f328ef57fad. > RSP: 002b:00007ffd7ad34110 EFLAGS: 00000202 ORIG_RAX: 000000000000003d > RAX: fffffffffffffe00 RBX: 0000555594d02500 RCX: 00007f328ef57fd7 > RDX: 0000000040000000 RSI: 00007ffd7ad3416c RDI: ffffffffffffffff > RBP: 00007ffd7ad3416c R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd7ad341e8 > R13: 0000000000000002 R14: 00007ffd7ad343c8 R15: 0000000000000000 > > ---------------- > Code disassembly (best guess), 2 bytes skipped: > 0: 49 8d 7d 18 lea 0x18(%r13),%rdi > 4: 48 89 f8 mov %rdi,%rax > 7: 48 c1 e8 03 shr $0x3,%rax > b: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) > 10: 74 05 je 0x17 > 12: e8 7a 7b a5 00 call 0xa57b91 > 17: 49 8b 75 18 mov 0x18(%r13),%rsi > 1b: 49 81 c7 70 01 00 00 add $0x170,%r15 > 22: 4c 89 f7 mov %r14,%rdi > 25: 4c 89 fa mov %r15,%rdx > * 28: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction > 2d: 4c 89 e8 mov %r13,%rax > 30: 48 c1 e8 03 shr $0x3,%rax > 34: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) > 39: 74 08 je 0x43 > 3b: 4c 89 ef mov %r13,%rdi > > > --- > 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