INFO: trying to register non-static key.
kobject: 'loop4' (000000007af32e1c): kobject_uevent_env
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 0 PID: 17554 Comm: syz-executor3 Not tainted 4.19.0-rc5+ #109
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+0x1c4/0x2b4 lib/dump_stack.c:113
 assign_lock_key kernel/locking/lockdep.c:727 [inline]
 register_lock_class+0x21a7/0x29b0 kernel/locking/lockdep.c:753
kobject: 'loop4' (000000007af32e1c): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (000000007e523884): kobject_uevent_env
kobject: 'loop1' (000000007e523884): fill_kobj_path: path = '/devices/virtual/block/loop1'
 __lock_acquire+0x1c1/0x4ec0 kernel/locking/lockdep.c:3299
kobject: 'loop0' (000000003cfdddef): kobject_uevent_env
 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3900
kobject: 'loop0' (000000003cfdddef): fill_kobj_path: path = '/devices/virtual/block/loop0'
 __mutex_lock_common kernel/locking/mutex.c:925 [inline]
 __mutex_lock+0x166/0x1700 kernel/locking/mutex.c:1072
kobject: 'loop5' (0000000066e3b71b): kobject_uevent_env
kobject: 'loop5' (0000000066e3b71b): fill_kobj_path: path = '/devices/virtual/block/loop5'
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 tun_get_user+0x1e02/0x42a0 drivers/net/tun.c:1826
kobject: 'loop2' (00000000ae374d71): kobject_uevent_env
kobject: 'loop2' (00000000ae374d71): fill_kobj_path: path = '/devices/virtual/block/loop2'
 tun_chr_write_iter+0xb9/0x160 drivers/net/tun.c:2001
kobject: 'loop4' (000000007af32e1c): kobject_uevent_env
 call_write_iter include/linux/fs.h:1808 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x6b8/0x9f0 fs/read_write.c:487
kobject: 'loop4' (000000007af32e1c): fill_kobj_path: path = '/devices/virtual/block/loop4'
 vfs_write+0x1fc/0x560 fs/read_write.c:549
 ksys_write+0x101/0x260 fs/read_write.c:598
kobject: 'loop0' (000000003cfdddef): kobject_uevent_env
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
kobject: 'loop0' (000000003cfdddef): fill_kobj_path: path = '/devices/virtual/block/loop0'
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
kobject: 'loop2' (00000000ae374d71): kobject_uevent_env
kobject: 'loop2' (00000000ae374d71): fill_kobj_path: path = '/devices/virtual/block/loop2'
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457579
Code: 1d b4 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
kobject: 'loop4' (000000007af32e1c): kobject_uevent_env
RSP: 002b:00007f0ce812ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579
RDX: 0000000000000012 RSI: 0000000020000000 RDI: 0000000000000010
RBP: 000000000072c2c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0ce812f6d4
R13: 00000000004c5574 R14: 00000000004d8e98 R15: 00000000ffffffff
WARNING: CPU: 0 PID: 17554 at net/core/flow_dissector.c:764 __skb_flow_dissect+0xdc5/0x5c10 net/core/flow_dissector.c:764
kobject: 'loop4' (000000007af32e1c): fill_kobj_path: path = '/devices/virtual/block/loop4'