syzbot has found a reproducer for the following issue on: HEAD commit: 734610514cb0 Merge tag 'erofs-for-6.10-rc7-fixes' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=151ea512980000 kernel config: https://syzkaller.appspot.com/x/.config?x=de2d4dc103148cd6 dashboard link: https://syzkaller.appspot.com/bug?extid=91dbdfecdd3287734d8e compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1424d281980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-73461051.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d390d5c7156f/vmlinux-73461051.xz kernel image: https://storage.googleapis.com/syzbot-assets/b56ef48ffa7e/bzImage-73461051.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+91dbdfecdd3287734d8e@xxxxxxxxxxxxxxxxxxxxxxxxx Bluetooth: hci0: hardware error 0x20 Bluetooth: hci0: Opcode 0x0c03 failed: -110 ============================================ WARNING: possible recursive locking detected 6.10.0-rc6-syzkaller-00055-g734610514cb0 #0 Not tainted -------------------------------------------- kworker/u33:1/4633 is trying to acquire lock: ffff88802b9cc148 ((wq_completion)hci0){+.+.}-{0:0}, at: touch_wq_lockdep_map+0x6e/0x120 kernel/workqueue.c:3895 but task is already holding lock: ffff88802b9cc148 ((wq_completion)hci0){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3223 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock((wq_completion)hci0); lock((wq_completion)hci0); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by kworker/u33:1/4633: #0: ffff88802b9cc148 ((wq_completion)hci0){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3223 #1: ffffc90025177d80 ((work_completion)(&hdev->error_reset)){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3224 stack backtrace: CPU: 2 PID: 4633 Comm: kworker/u33:1 Not tainted 6.10.0-rc6-syzkaller-00055-g734610514cb0 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: hci0 hci_error_reset Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 check_deadlock kernel/locking/lockdep.c:3062 [inline] validate_chain kernel/locking/lockdep.c:3856 [inline] __lock_acquire+0x20e6/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 touch_wq_lockdep_map+0x78/0x120 kernel/workqueue.c:3895 __flush_workqueue+0x129/0x1200 kernel/workqueue.c:3937 drain_workqueue+0x18f/0x3d0 kernel/workqueue.c:4101 destroy_workqueue+0xc2/0xaa0 kernel/workqueue.c:5817 hci_release_dev+0x14e/0x660 net/bluetooth/hci_core.c:2795 bt_host_release+0x6a/0xb0 net/bluetooth/hci_sysfs.c:94 device_release+0xa1/0x240 drivers/base/core.c:2581 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1fa/0x5b0 lib/kobject.c:737 put_device+0x1f/0x30 drivers/base/core.c:3787 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3248 process_scheduled_works kernel/workqueue.c:3329 [inline] worker_thread+0x6c8/0xf30 kernel/workqueue.c:3409 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
