Hello, syzbot found the following issue on: HEAD commit: ac3a0c84 Merge git://git.kernel.org/pub/scm/linux/kernel/g.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=10887792900000 kernel config: https://syzkaller.appspot.com/x/.config?x=c0cfcf935bcc94d2 dashboard link: https://syzkaller.appspot.com/bug?extid=f456fc1d58a1f67c401f compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=123baf04900000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f456fc1d58a1f67c401f@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 0 PID: 22435 at kernel/locking/lockdep.c:183 hlock_class kernel/locking/lockdep.c:183 [inline] WARNING: CPU: 0 PID: 22435 at kernel/locking/lockdep.c:183 hlock_class kernel/locking/lockdep.c:172 [inline] WARNING: CPU: 0 PID: 22435 at kernel/locking/lockdep.c:183 check_wait_context kernel/locking/lockdep.c:4054 [inline] WARNING: CPU: 0 PID: 22435 at kernel/locking/lockdep.c:183 __lock_acquire+0x1629/0x56e0 kernel/locking/lockdep.c:4330 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 22435 Comm: syz-executor.2 Not tainted 5.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:231 __warn.cold+0x20/0x45 kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:235 exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:540 RIP: 0010:hlock_class kernel/locking/lockdep.c:183 [inline] RIP: 0010:hlock_class kernel/locking/lockdep.c:172 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4054 [inline] RIP: 0010:__lock_acquire+0x1629/0x56e0 kernel/locking/lockdep.c:4330 Code: 08 84 d2 0f 85 bd 35 00 00 8b 35 a2 a2 55 09 85 f6 0f 85 cc fa ff ff 48 c7 c6 20 b0 4b 88 48 c7 c7 20 ab 4b 88 e8 b9 44 eb ff <0f> 0b e9 b2 fa ff ff e8 3b a0 8e 06 85 c0 0f 84 ed fa ff ff 48 c7 RSP: 0018:ffffc90002a17810 EFLAGS: 00010086 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff8880949044c0 RSI: ffffffff815d4ef7 RDI: fffff52000542ef4 RBP: ffff888094904db8 R08: 0000000000000000 R09: ffffffff89bb5c23 R10: 0000000000000aea R11: 0000000000000001 R12: ffff8880949044c0 R13: 00000000000006d9 R14: ffff88809487c138 R15: 0000000000040000 lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:4959 flush_workqueue+0x110/0x13e0 kernel/workqueue.c:2780 drain_workqueue+0x1a5/0x3c0 kernel/workqueue.c:2945 hci_dev_do_reset net/bluetooth/hci_core.c:1864 [inline] hci_dev_reset+0x23e/0x450 net/bluetooth/hci_core.c:1907 hci_sock_ioctl+0x510/0x800 net/bluetooth/hci_sock.c:1036 sock_do_ioctl+0xcb/0x2d0 net/socket.c:1048 sock_ioctl+0x3b8/0x730 net/socket.c:1199 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:753 __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl fs/ioctl.c:760 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cce9 Code: 2d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fab01629c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000001d300 RCX: 000000000045cce9 RDX: 0000000000000000 RSI: 00000000400448cb RDI: 0000000000000006 RBP: 000000000078c120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c0ec R13: 00007ffc2d1075ff R14: 00007fab0162a9c0 R15: 000000000078c0ec Kernel Offset: disabled Rebooting in 86400 seconds.. --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
