From: syzbot <syzbot+ebbbf06f152da8ea4716@syzkaller.appspotmail.com>
To: davem@davemloft.net, david@ixit.cz, edumazet@google.com,
horms@kernel.org, krzk@kernel.org, kuba@kernel.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
oe-linux-nfc@lists.linux.dev, pabeni@redhat.com,
syzkaller-bugs@googlegroups.com
Subject: [syzbot] [net?] [nfc?] WARNING in nci_rsp_packet
Date: Thu, 01 Oct 2026 23:47:34 -0700 [thread overview]
Message-ID: <6abf5386.f32479dd.202a09.0008.GAE@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: d266640c6c76 Merge tag 'driver-core-7.3-rc5' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=116eb315580000
kernel config: https://syzkaller.appspot.com/x/.config?x=2a820d8842c77560
dashboard link: https://syzkaller.appspot.com/bug?extid=ebbbf06f152da8ea4716
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
userspace arch: i386
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-d266640c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7a2c43e9e32e/vmlinux-d266640c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/74034a2af7be/bzImage-d266640c.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ebbbf06f152da8ea4716@syzkaller.appspotmail.com
------------[ cut here ]------------
workqueue: cannot queue nci_cmd_work on wq nfc2_nci_cmd_wq
WARNING: kernel/workqueue.c:2352 at __queue_work+0xdb7/0x1370 kernel/workqueue.c:2351, CPU#3: kworker/u32:0/12
Modules linked in:
CPU: 3 UID: 0 PID: 12 Comm: kworker/u32:0 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: nfc2_nci_rx_wq nci_rx_work
RIP: 0010:__queue_work+0xdbb/0x1370 kernel/workqueue.c:2351
Code: 00 00 00 fc ff df 49 8d 94 24 70 01 00 00 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 84 05 00 00 48 8d 3d 29 43 78 0f 48 8b 75 18 <67> 48 0f b9 3a 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03
RSP: 0000:ffffc900001e7a40 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff888026cc1000 RCX: 1ffff1100f10e022
RDX: ffff8880298be170 RSI: ffffffff8ba2d9c0 RDI: ffffffff91486f90
RBP: ffff8880788700f8 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000200000 R11: 000000000000761b R12: ffff8880298be000
R13: 1ffff9200003cf52 R14: 0000000000000020 R15: 0000000000000084
FS: 0000000000000000(0000) GS:ffff888096c55000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000c3aef55 CR3: 0000000078b7d000 CR4: 0000000000352ef0
Call Trace:
<TASK>
queue_work_on+0x180/0x1e0 kernel/workqueue.c:2501
queue_work include/linux/workqueue.h:700 [inline]
nci_rsp_packet+0x297/0x3420 net/nfc/nci/rsp.c:463
nci_rx_work+0x29c/0x430 net/nfc/nci/core.c:1579
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
process_scheduled_works kernel/workqueue.c:3479 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 fc add %bh,%ah
4: ff lcall (bad)
5: df 49 8d fisttps -0x73(%rcx)
8: 94 xchg %eax,%esp
9: 24 70 and $0x70,%al
b: 01 00 add %eax,(%rax)
d: 00 48 89 add %cl,-0x77(%rax)
10: f9 stc
11: 48 c1 e9 03 shr $0x3,%rcx
15: 80 3c 01 00 cmpb $0x0,(%rcx,%rax,1)
19: 0f 85 84 05 00 00 jne 0x5a3
1f: 48 8d 3d 29 43 78 0f lea 0xf784329(%rip),%rdi # 0xf78434f
26: 48 8b 75 18 mov 0x18(%rbp),%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
36: fc ff df
39: 48 89 ea mov %rbp,%rdx
3c: 48 c1 ea 03 shr $0x3,%rdx
---
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reply other threads:[~2026-10-02 6:47 UTC|newest]
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