Hello, syzbot found the following issue on: HEAD commit: 906bd684e4b1 Merge tag 'spi-fix-v6.12-rc6' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11bacea7980000 kernel config: https://syzkaller.appspot.com/x/.config?x=20d60fe605153ebe dashboard link: https://syzkaller.appspot.com/bug?extid=179a0c842142690ca7cb compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-906bd684.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/34d4b570061f/vmlinux-906bd684.xz kernel image: https://storage.googleapis.com/syzbot-assets/08ae18992ed1/bzImage-906bd684.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+179a0c842142690ca7cb@xxxxxxxxxxxxxxxxxxxxxxxxx Nov 8 11:01:11 syzkNov 8 11:01:11 syzkaller daemon.err dhcpcd[5661]: libudev: received NULL device Nov 8 11:01:11 syzkaller daemon.err dhcpcd[5661]: libudev: received NULL device Nov 8 11:01:11 syzkaller daemon.err dhcpcd[5661]: libudev: received NULL device Nov 8 11:01:11 syzkaller daemon.err dhcpcd[5661]: libudev: received NULL device Nov 8 11:01:11 syzkaller daemon.err dhc[ 112.611200][ T35] ------------[ cut here ]------------ pcd[5661]: libud[ 112.612841][ T35] WARNING: CPU: 3 PID: 35 at kernel/workqueue.c:2257 __queue_work+0xc3a/0x1080 kernel/workqueue.c:2256 ev: received NUL[ 112.616635][ T35] CPU: 3 UID: 0 PID: 35 Comm: kworker/3:0 Not tainted 6.12.0-rc6-syzkaller-00169-g906bd684e4b1 #0 Nov 8 11:01:11 [ 112.619771][ T35] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 syzkaller daemon[ 112.622998][ T35] Workqueue: events l2cap_chan_timeout .err dhcpcd[5661[ 112.626360][ T35] Code: 07 83 c0 03 38 d0 7c 09 84 d2 74 05 e8 2f e7 97 00 8b 5b 2c 31 ff 83 e3 20 89 de e8 80 5f 36 00 85 db 75 60 e8 37 5d 36 00 90 <0f> 0b 90 e9 f9 f7 ff ff e8 29 5d 36 00 90 0f 0b 90 e9 a8 f7 ff ff ]: libudev: rece[ 112.631694][ T35] RSP: 0018:ffffc900008efab8 EFLAGS: 00010093 ived NULL device[ 112.633897][ T35] RAX: 0000000000000000 RBX: ffff88801b0a0c00 RCX: ffffffff8159028a Nov 8 11:01:1[ 112.633927][ T35] RBP: ffff88804b5b48c8 R08: 0000000000000005 R09: 0000000000000000 1 syzkaller daem[ 112.633934][ T35] R10: 0000000000200000 R11: 0000000000000000 R12: ffff888028731800 on.err dhcpcd[56[ 112.633941][ T35] R13: 0000000000000008 R14: ffff88804b5b48d0 R15: ffff888028731800 61]: libudev: re[ 112.648173][ T35] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 ceived NULL devi[ 112.650334][ T35] CR2: 00005633f9eb8300 CR3: 00000000245a0000 CR4: 0000000000352ef0 ce Nov 8 11:01[ 112.655004][ T35] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 :11 syzkaller da[ 112.655013][ T35] Call Trace: emon.err dhcpcd[[ 112.655023][ T35] ? __warn+0xea/0x3d0 kernel/panic.c:746 Nov 8 11:01:11 syzkaller daemon[ 112.655042][ T35] ? __queue_work+0xc3a/0x1080 kernel/workqueue.c:2256 .err dhcpcd[5661[ 112.663447][ T35] ? __report_bug lib/bug.c:199 [inline] .err dhcpcd[5661[ 112.663447][ T35] ? report_bug+0x3c0/0x580 lib/bug.c:219 ]: libudev: rece[ 112.665186][ T35] ? handle_bug+0x54/0xa0 arch/x86/kernel/traps.c:285 ived NULL device[ 112.665198][ T35] ? exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:309 Nov 8 11:01:1[ 112.665209][ T35] ? asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 1 syzkaller daem[ 112.665227][ T35] ? to_kthread kernel/kthread.c:76 [inline] 1 syzkaller daem[ 112.665227][ T35] ? kthread_data+0x4a/0xc0 kernel/kthread.c:244 on.err dhcpcd[56[ 112.672090][ T35] ? __queue_work+0xc39/0x1080 kernel/workqueue.c:2256 61]: libudev: re[ 112.673920][ T35] ? __queue_work+0xc3a/0x1080 kernel/workqueue.c:2256 ceived NULL devi[ 112.675676][ T35] ? __queue_work+0xc39/0x1080 kernel/workqueue.c:2256 ce Nov 8 11:01[ 112.677419][ T35] ? clear_pending_if_disabled+0xa9/0x210 kernel/workqueue.c:2358 :11 syzkaller da[ 112.679306][ T35] ? __pfx_clear_pending_if_disabled+0x10/0x10 arch/x86/include/asm/atomic.h:23 emon.err dhcpcd[[ 112.681308][ T35] __queue_delayed_work+0x21b/0x2e0 kernel/workqueue.c:2507 5661]: libudev: [ 112.683075][ T35] queue_delayed_work_on+0x12a/0x150 kernel/workqueue.c:2552 received NULL de[ 112.684835][ T35] queue_delayed_work include/linux/workqueue.h:677 [inline] received NULL de[ 112.684835][ T35] hci_conn_drop include/net/bluetooth/hci_core.h:1570 [inline] received NULL de[ 112.684835][ T35] hci_conn_drop include/net/bluetooth/hci_core.h:1544 [inline] received NULL de[ 112.684835][ T35] l2cap_chan_del+0x5a0/0x900 net/bluetooth/l2cap_core.c:674 vice Nov 8 11:[ 112.686467][ T35] l2cap_chan_close+0xff/0xa30 net/bluetooth/l2cap_core.c:847 01:11 syzkaller [ 112.688470][ T35] ? __pfx_l2cap_chan_close+0x10/0x10 net/bluetooth/l2cap_core.c:3787 daemon.err dhcpc[ 112.690727][ T35] ? rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] daemon.err dhcpc[ 112.690727][ T35] ? rcu_is_watching+0x12/0xc0 kernel/rcu/tree.c:737 Nov 8 11:01:11 [ 112.692741][ T35] ? trace_lock_acquire+0x14a/0x1d0 include/trace/events/lock.h:24 syzkaller daemon[ 112.696630][ T35] l2cap_chan_timeout+0x196/0x310 net/bluetooth/l2cap_core.c:435 .err dhcpcd[5661[ 112.698753][ T35] process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 ]: libudev: rece[ 112.700904][ T35] ? __pfx_lock_acquire.part.0+0x10/0x10 kernel/locking/lockdep.c:122 ived NULL device[ 112.703198][ T35] ? __pfx_process_one_work+0x10/0x10 include/linux/list.h:153 Nov 8 11:01:1[ 112.705413][ T35] ? assign_work+0x1a0/0x250 kernel/workqueue.c:1200 1 syzkaller daem[ 112.707453][ T35] process_scheduled_works kernel/workqueue.c:3310 [inline] 1 syzkaller daem[ 112.707453][ T35] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 on.err dhcpcd[56[ 112.709488][ T35] ? __pfx_worker_thread+0x10/0x10 include/linux/list.h:183 61]: libudev: re[ 112.711618][ T35] kthread+0x2c1/0x3a0 kernel/kthread.c:389 ceived NULL devi[ 112.713380][ T35] ? __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] ceived NULL devi[ 112.713380][ T35] ? _raw_spin_unlock_irq+0x23/0x50 kernel/locking/spinlock.c:202 ce Nov 8 11:01[ 112.715597][ T35] ? __pfx_kthread+0x10/0x10 include/linux/list.h:373 :11 syzkaller da[ 112.717559][ T35] ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 emon.err dhcpcd[[ 112.719468][ T35] ? __pfx_kthread+0x10/0x10 include/linux/list.h:373 5661]: libudev: [ 112.721437][ T35] ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 received NULL de[ 112.723473][ T35] </TASK> vic[e --- This report is generated by a bot. 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