device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state IPVS: set_ctl: invalid protocol: 255 0.0.0.0:20004 ====================================================== WARNING: possible circular locking dependency detected 4.18.0-rc5+ #159 Not tainted ------------------------------------------------------ syz-executor7/24660 is trying to acquire lock: 000000007bd46ec8 (sb_writers#15){.+.+}, at: sb_start_write include/linux/fs.h:1554 [inline] 000000007bd46ec8 (sb_writers#15){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 but task is already holding lock: 00000000a4a13f7a (&fi->mutex){+.+.}, at: fuse_lock_inode+0xaf/0xe0 fs/fuse/inode.c:363 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&fi->mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:757 [inline] __mutex_lock+0x176/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 fuse_lock_inode+0xaf/0xe0 fs/fuse/inode.c:363 fuse_lookup+0x8f/0x4c0 fs/fuse/dir.c:359 __lookup_hash+0x12e/0x190 fs/namei.c:1505 filename_create+0x1e5/0x5b0 fs/namei.c:3646 user_path_create fs/namei.c:3703 [inline] do_mkdirat+0xda/0x310 fs/namei.c:3842 __do_sys_mkdirat fs/namei.c:3861 [inline] __se_sys_mkdirat fs/namei.c:3859 [inline] __x64_sys_mkdirat+0x76/0xb0 fs/namei.c:3859 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&type->i_mutex_dir_key#5/1){+.+.}: down_write_nested+0x93/0x130 kernel/locking/rwsem.c:192 inode_lock_nested include/linux/fs.h:750 [inline] filename_create+0x1b2/0x5b0 fs/namei.c:3645 user_path_create fs/namei.c:3703 [inline] do_mkdirat+0xda/0x310 fs/namei.c:3842 __do_sys_mkdirat fs/namei.c:3861 [inline] __se_sys_mkdirat fs/namei.c:3859 [inline] __x64_sys_mkdirat+0x76/0xb0 fs/namei.c:3859 nla_parse: 14 callbacks suppressed netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'. do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (sb_writers#15){.+.+}: lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x1e9/0x300 fs/super.c:1403 sb_start_write include/linux/fs.h:1554 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:386 path_removexattr+0xf0/0x210 fs/xattr.c:703 __do_sys_removexattr fs/xattr.c:719 [inline] __se_sys_removexattr fs/xattr.c:716 [inline] __x64_sys_removexattr+0x59/0x80 fs/xattr.c:716 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: sb_writers#15 --> &type->i_mutex_dir_key#5/1 --> &fi->mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&fi->mutex); lock(&type->i_mutex_dir_key#5/1); lock(&fi->mutex); lock(sb_writers#15); *** DEADLOCK *** 1 lock held by syz-executor7/24660: #0: 00000000a4a13f7a (&fi->mutex){+.+.}, at: fuse_lock_inode+0xaf/0xe0 fs/fuse/inode.c:363 stack backtrace: CPU: 1 PID: 24660 Comm: syz-executor7 Not tainted 4.18.0-rc5+ #159 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_circular_bug.isra.36.cold.57+0x1bd/0x27d kernel/locking/lockdep.c:1227 check_prev_add kernel/locking/lockdep.c:1867 [inline] check_prevs_add kernel/locking/lockdep.c:1980 [inline] validate_chain kernel/locking/lockdep.c:2421 [inline] __lock_acquire+0x3449/0x5020 kernel/locking/lockdep.c:3435 lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x1e9/0x300 fs/super.c:1403 sb_start_write include/linux/fs.h:1554 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:386 path_removexattr+0xf0/0x210 fs/xattr.c:703 __do_sys_removexattr fs/xattr.c:719 [inline] __se_sys_removexattr fs/xattr.c:716 [inline] __x64_sys_removexattr+0x59/0x80 fs/xattr.c:716 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: 1d ba 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 b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fee4a211c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000c5 RAX: ffffffffffffffda RBX: 00007fee4a2126d4 RCX: 0000000000455ab9 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000020000040 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004bbc1c R14: 00000000004d0f48 R15: 0000000000000000 team0 (unregistering): Port device team_slave_1 removed team0 (unregistering): Port device team_slave_0 removed bond0 (unregistering): Releasing backup interface bond_slave_1 bond0 (unregistering): Releasing backup interface bond_slave_0 bond0 (unregistering): Released all slaves netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'. nla_parse: 16 callbacks suppressed netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'.