INFO: trying to register non-static key. the code is fine but needs lockdep annotation. turning off the locking correctness validator. CPU: 1 PID: 6874 Comm: syz-executor.2 Not tainted 4.19.182-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 new mount options do not match the existing superblock, will be ignored Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 assign_lock_key kernel/locking/lockdep.c:727 [inline] register_lock_class+0xe76/0x11c0 kernel/locking/lockdep.c:753 __lock_acquire+0x17d/0x3ff0 kernel/locking/lockdep.c:3303 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:152 skb_dequeue+0x1c/0x180 net/core/skbuff.c:2834 skb_queue_purge+0x21/0x30 net/core/skbuff.c:2872 l2cap_chan_del+0x690/0xa50 net/bluetooth/l2cap_core.c:637 l2cap_chan_close+0x1b5/0x950 net/bluetooth/l2cap_core.c:757 l2cap_sock_shutdown+0x339/0xe10 net/bluetooth/l2cap_sock.c:1159 l2cap_sock_release+0x77/0x290 net/bluetooth/l2cap_sock.c:1202 __sock_release+0xcd/0x2a0 net/socket.c:579 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x41926b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffe2d9c53e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 000000000041926b RDX: ffffffffffffffbc RSI: 0000000008c9f276 RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2e022128 R10: 00007ffe2d9c54d0 R11: 0000000000000293 R12: 00000000000d6c1c R13: 00000000000003e8 R14: 000000000056bf60 R15: 00000000000d6bfc netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. audit: type=1326 audit(1616243654.498:392): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=6891 comm="syz-executor.1" exe="/root/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x466459 code=0x0 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. BTRFS info (device loop2): disabling disk space caching BTRFS info (device loop2): force zlib compression, level 3 BTRFS info (device loop2): turning on flush-on-commit BTRFS info (device loop2): has skinny extents tmpfs: No value for mount option 'dont_hash' tmpfs: No value for mount option 'dont_hash' netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 64 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 64 bytes leftover after parsing attributes in process `syz-executor.1'. BTRFS info (device loop2): disabling disk space caching BTRFS info (device loop2): force zlib compression, level 3 BTRFS info (device loop2): turning on flush-on-commit BTRFS info (device loop2): has skinny extents netlink: 64 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 64 bytes leftover after parsing attributes in process `syz-executor.1'. BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 7 scanned by syz-executor.0 (7044) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 7 scanned by systemd-udevd (7082) BTRFS info (device loop1): disabling disk space caching BTRFS info (device loop1): force zlib compression, level 3 BTRFS info (device loop1): turning on flush-on-commit BTRFS info (device loop1): has skinny extents BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 7 scanned by syz-executor.2 (7107) BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 7 scanned by systemd-udevd (7147) BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 7 scanned by systemd-udevd (7167) BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 7 scanned by syz-executor.3 (7164) BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 7 scanned by syz-executor.0 (7174) BTRFS info (device loop2): disabling disk space caching BTRFS info (device loop2): force zlib compression, level 3 BTRFS info (device loop2): turning on flush-on-commit BTRFS info (device loop2): has skinny extents netlink: 'syz-executor.4': attribute type 6 has an invalid length. netlink: 'syz-executor.4': attribute type 6 has an invalid length. BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 7 scanned by syz-executor.1 (7195) BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 7 scanned by systemd-udevd (7222) netlink: 'syz-executor.4': attribute type 6 has an invalid length. netlink: 'syz-executor.4': attribute type 6 has an invalid length. syz-executor.2 uses obsolete (PF_INET,SOCK_PACKET) BTRFS info (device loop3): disabling disk space caching BTRFS info (device loop3): force zlib compression, level 3 BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): has skinny extents BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 7 scanned by syz-executor.0 (7257) BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 7 scanned by syz-executor.1 (7303) ip6gre0: Cannot use loopback or non-ethernet device as HSR slave. BTRFS info (device loop3): disabling disk space caching BTRFS info (device loop3): force zlib compression, level 3 BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): has skinny extents ip6gre0: Cannot use loopback or non-ethernet device as HSR slave. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. ip6gre0: Cannot use loopback or non-ethernet device as HSR slave. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. ip6gre0: Cannot use loopback or non-ethernet device as HSR slave. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'.