FAT-fs (loop3): This looks like a DOS 1.x volume; assuming default BPB values kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 1 PID: 6421 Comm: kworker/1:3 Not tainted 4.14.198-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events l2cap_chan_timeout task: ffff8880567cc100 task.stack: ffff8880567d0000 RIP: 0010:atomic_inc arch/x86/include/asm/atomic.h:92 [inline] RIP: 0010:__lock_acquire+0x21e/0x3f20 kernel/locking/lockdep.c:3382 RSP: 0018:ffff8880567d79b8 EFLAGS: 00010086 RAX: dead4ead00000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 1ffff110136eb435 RSI: 0000000000000000 RDI: ffff88809b75a1a8 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffff8880567cc100 R12: ffff88809b75a1a0 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8a5a8c00 FS: 0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31524000 CR3: 00000000a6148000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:176 spin_lock_bh include/linux/spinlock.h:322 [inline] lock_sock_nested+0x39/0x100 net/core/sock.c:2788 l2cap_sock_teardown_cb+0x7b/0x400 net/bluetooth/l2cap_sock.c:1329 l2cap_chan_del+0xa0/0x800 net/bluetooth/l2cap_core.c:596 l2cap_chan_close+0xd5/0x770 net/bluetooth/l2cap_core.c:754 l2cap_chan_timeout+0x134/0x1e0 net/bluetooth/l2cap_core.c:427 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 00 fc ff df 41 89 f6 4b 8d 7c f4 08 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 5e 2a 00 00 4b 8b 44 f4 08 48 85 c0 0f 84 31 ff ff ff ff 80 38 01 00 00 49 8d b3 80 08 00 00 48 ba 00 00 00 00 00 RIP: atomic_inc arch/x86/include/asm/atomic.h:92 [inline] RSP: ffff8880567d79b8 RIP: __lock_acquire+0x21e/0x3f20 kernel/locking/lockdep.c:3382 RSP: ffff8880567d79b8 ---[ end trace eaf8c8fdc91f70d6 ]---