IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 ====================================================== WARNING: possible circular locking dependency detected 4.19.0-rc4+ #26 Not tainted ------------------------------------------------------ syz-executor0/7265 is trying to acquire lock: 0000000096079ddd (&p->lock){+.+.}, at: seq_read+0x71/0x1150 fs/seq_file.c:161 but task is already holding lock: 000000004814d86c (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:62 [inline] 000000004814d86c (&pipe->mutex/1){+.+.}, at: pipe_lock+0x6e/0x80 fs/pipe.c:70 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&pipe->mutex/1){+.+.}: __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0x166/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __pipe_lock fs/pipe.c:83 [inline] fifo_open+0x15c/0xad0 fs/pipe.c:905 do_dentry_open+0x499/0x1250 fs/open.c:771 vfs_open+0xa0/0xd0 fs/open.c:880 do_last fs/namei.c:3418 [inline] path_openat+0x12bf/0x5160 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_open_execat+0x221/0x8e0 fs/exec.c:853 __do_execve_file.isra.33+0x173f/0x2540 fs/exec.c:1755 do_execveat_common fs/exec.c:1866 [inline] do_execve fs/exec.c:1883 [inline] __do_sys_execve fs/exec.c:1964 [inline] __se_sys_execve fs/exec.c:1959 [inline] __x64_sys_execve+0x8f/0xc0 fs/exec.c:1959 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&sig->cred_guard_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0x166/0x1700 kernel/locking/mutex.c:1072 mutex_lock_killable_nested+0x16/0x20 kernel/locking/mutex.c:1102 lock_trace+0x4c/0xe0 fs/proc/base.c:384 proc_pid_personality+0x1c/0xd0 fs/proc/base.c:2877 proc_single_show+0x101/0x190 fs/proc/base.c:723 traverse+0x344/0x7b0 fs/seq_file.c:113 seq_read+0xc76/0x1150 fs/seq_file.c:188 do_loop_readv_writev fs/read_write.c:700 [inline] do_iter_read+0x4a3/0x650 fs/read_write.c:924 vfs_readv+0x175/0x1c0 fs/read_write.c:986 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x53c/0xb20 fs/splice.c:417 do_splice_to+0x12e/0x190 fs/splice.c:881 splice_direct_to_actor+0x270/0x8f0 fs/splice.c:953 do_splice_direct+0x2d4/0x420 fs/splice.c:1062 do_sendfile+0x62a/0xe20 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1495 [inline] __se_sys_sendfile64 fs/read_write.c:1487 [inline] __x64_sys_sendfile64+0x15d/0x250 fs/read_write.c:1487 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&p->lock){+.+.}: lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3900 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0x166/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 seq_read+0x71/0x1150 fs/seq_file.c:161 do_loop_readv_writev fs/read_write.c:700 [inline] do_iter_read+0x4a3/0x650 fs/read_write.c:924 vfs_readv+0x175/0x1c0 fs/read_write.c:986 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x53c/0xb20 fs/splice.c:417 do_splice_to+0x12e/0x190 fs/splice.c:881 do_splice+0x1014/0x1430 fs/splice.c:1174 __do_sys_splice fs/splice.c:1415 [inline] __se_sys_splice fs/splice.c:1395 [inline] __x64_sys_splice+0x2c1/0x330 fs/splice.c:1395 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: &p->lock --> &sig->cred_guard_mutex --> &pipe->mutex/1 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&pipe->mutex/1); lock(&sig->cred_guard_mutex); lock(&pipe->mutex/1); lock(&p->lock); *** DEADLOCK *** 1 lock held by syz-executor0/7265: #0: 000000004814d86c (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:62 [inline] #0: 000000004814d86c (&pipe->mutex/1){+.+.}, at: pipe_lock+0x6e/0x80 fs/pipe.c:70 stack backtrace: CPU: 1 PID: 7265 Comm: syz-executor0 Not tainted 4.19.0-rc4+ #26 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 print_circular_bug.isra.33.cold.54+0x1bd/0x27d kernel/locking/lockdep.c:1221 check_prev_add kernel/locking/lockdep.c:1861 [inline] check_prevs_add kernel/locking/lockdep.c:1974 [inline] validate_chain kernel/locking/lockdep.c:2415 [inline] __lock_acquire+0x33e4/0x4ec0 kernel/locking/lockdep.c:3411 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3900 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0x166/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 seq_read+0x71/0x1150 fs/seq_file.c:161 do_loop_readv_writev fs/read_write.c:700 [inline] do_iter_read+0x4a3/0x650 fs/read_write.c:924 vfs_readv+0x175/0x1c0 fs/read_write.c:986 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x53c/0xb20 fs/splice.c:417 do_splice_to+0x12e/0x190 fs/splice.c:881 do_splice+0x1014/0x1430 fs/splice.c:1174 __do_sys_splice fs/splice.c:1415 [inline] __se_sys_splice fs/splice.c:1395 [inline] __x64_sys_splice+0x2c1/0x330 fs/splice.c:1395 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457679 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 RSP: 002b:00007f910ad02c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f910ad036d4 RCX: 0000000000457679 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 000000000072c2c0 R08: 0000000000000200 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d77e8 R14: 00000000004c4f5d R15: 0000000000000006 kobject: 'loop4' (00000000076b82a0): kobject_uevent_env kobject: 'loop4' (00000000076b82a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (00000000cf0f8978): kobject_uevent_env kobject: 'loop0' (00000000cf0f8978): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000003ce955c1): kobject_uevent_env kobject: 'loop5' (000000003ce955c1): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (00000000b18e3d2d): kobject_uevent_env kobject: 'loop3' (00000000b18e3d2d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000a8c719dc): kobject_uevent_env kobject: 'loop1' (00000000a8c719dc): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (00000000bdfc5808): kobject_uevent_env kobject: 'loop2' (00000000bdfc5808): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000076b82a0): kobject_uevent_env kobject: 'loop4' (00000000076b82a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (000000003ce955c1): kobject_uevent_env kobject: 'loop5' (000000003ce955c1): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000cf0f8978): kobject_uevent_env kobject: 'loop0' (00000000cf0f8978): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (00000000b18e3d2d): kobject_uevent_env kobject: 'loop3' (00000000b18e3d2d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000a8c719dc): kobject_uevent_env kobject: 'loop1' (00000000a8c719dc): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (00000000bdfc5808): kobject_uevent_env kobject: 'loop2' (00000000bdfc5808): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000076b82a0): kobject_uevent_env kobject: 'loop4' (00000000076b82a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (00000000cf0f8978): kobject_uevent_env kobject: 'loop0' (00000000cf0f8978): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000003ce955c1): kobject_uevent_env kobject: 'loop5' (000000003ce955c1): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000a8c719dc): kobject_uevent_env kobject: 'loop1' (00000000a8c719dc): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (00000000bdfc5808): kobject_uevent_env kobject: 'loop2' (00000000bdfc5808): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000b18e3d2d): kobject_uevent_env kobject: 'loop3' (00000000b18e3d2d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (00000000076b82a0): kobject_uevent_env kobject: 'loop4' (00000000076b82a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (00000000cf0f8978): kobject_uevent_env kobject: 'loop0' (00000000cf0f8978): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000003ce955c1): kobject_uevent_env kobject: 'loop5' (000000003ce955c1): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000a8c719dc): kobject_uevent_env kobject: 'loop1' (00000000a8c719dc): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (00000000bdfc5808): kobject_uevent_env kobject: 'loop2' (00000000bdfc5808): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000b18e3d2d): kobject_uevent_env kobject: 'loop3' (00000000b18e3d2d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (00000000076b82a0): kobject_uevent_env kobject: 'loop4' (00000000076b82a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (00000000cf0f8978): kobject_uevent_env kobject: 'loop0' (00000000cf0f8978): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000003ce955c1): kobject_uevent_env kobject: 'loop5' (000000003ce955c1): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000a8c719dc): kobject_uevent_env kobject: 'loop1' (00000000a8c719dc): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (00000000b18e3d2d): kobject_uevent_env kobject: 'loop3' (00000000b18e3d2d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (00000000bdfc5808): kobject_uevent_env kobject: 'loop2' (00000000bdfc5808): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (00000000cf0f8978): kobject_uevent_env kobject: 'loop0' (00000000cf0f8978): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000076b82a0): kobject_uevent_env kobject: 'loop4' (00000000076b82a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (000000003ce955c1): kobject_uevent_env kobject: 'loop5' (000000003ce955c1): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000a8c719dc): kobject_uevent_env kobject: 'loop1' (00000000a8c719dc): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (00000000b18e3d2d): kobject_uevent_env kobject: 'loop3' (00000000b18e3d2d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (00000000bdfc5808): kobject_uevent_env kobject: 'loop2' (00000000bdfc5808): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (00000000cf0f8978): kobject_uevent_env kobject: 'loop0' (00000000cf0f8978): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000076b82a0): kobject_uevent_env kobject: 'loop4' (00000000076b82a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (000000003ce955c1): kobject_uevent_env kobject: 'loop5' (000000003ce955c1): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000a8c719dc): kobject_uevent_env kobject: 'loop1' (00000000a8c719dc): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (00000000b18e3d2d): kobject_uevent_env kobject: 'loop3' (00000000b18e3d2d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (00000000bdfc5808): kobject_uevent_env kobject: 'loop2' (00000000bdfc5808): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (00000000cf0f8978): kobject_uevent_env kobject: 'loop0' (00000000cf0f8978): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000076b82a0): kobject_uevent_env kobject: 'loop4' (00000000076b82a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (000000003ce955c1): kobject_uevent_env kobject: 'loop5' (000000003ce955c1): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (00000000bdfc5808): kobject_uevent_env kobject: 'loop2' (00000000bdfc5808): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000b18e3d2d): kobject_uevent_env kobject: 'loop3' (00000000b18e3d2d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000a8c719dc): kobject_uevent_env kobject: 'loop1' (00000000a8c719dc): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000cf0f8978): kobject_uevent_env kobject: 'loop0' (00000000cf0f8978): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000076b82a0): kobject_uevent_env kobject: 'loop4' (00000000076b82a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (000000003ce955c1): kobject_uevent_env kobject: 'loop5' (000000003ce955c1): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000a8c719dc): kobject_uevent_env kobject: 'loop1' (00000000a8c719dc): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (00000000b18e3d2d): kobject_uevent_env kobject: 'loop3' (00000000b18e3d2d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (00000000bdfc5808): kobject_uevent_env kobject: 'loop2' (00000000bdfc5808): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (00000000cf0f8978): kobject_uevent_env kobject: 'loop0' (00000000cf0f8978): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000076b82a0): kobject_uevent_env kobject: 'loop4' (00000000076b82a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (000000003ce955c1): kobject_uevent_env kobject: 'loop5' (000000003ce955c1): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000a8c719dc): kobject_uevent_env kobject: 'loop1' (00000000a8c719dc): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (00000000bdfc5808): kobject_uevent_env kobject: 'loop2' (00000000bdfc5808): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000b18e3d2d): kobject_uevent_env kobject: 'loop3' (00000000b18e3d2d): fill_kobj_path: path = '/devices/virtual/block/loop3'