overlayfs: failed to resolve './file0': -2 ============================================ WARNING: possible recursive locking detected 4.19.211-syzkaller #0 Not tainted -------------------------------------------- syz-executor.5/26102 is trying to acquire lock: 000000005b93d10d (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] 000000005b93d10d (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0x2e1/0x660 fs/fuse/dir.c:1006 but task is already holding lock: 00000000adec798a (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] 00000000adec798a (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0xaa/0x660 fs/fuse/dir.c:987 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&type->i_mutex_dir_key#8); lock(&type->i_mutex_dir_key#8); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz-executor.5/26102: #0: 00000000777af93d (&fc->killsb){++++}, at: fuse_notify_delete fs/fuse/dev.c:1582 [inline] #0: 00000000777af93d (&fc->killsb){++++}, at: fuse_notify fs/fuse/dev.c:1819 [inline] #0: 00000000777af93d (&fc->killsb){++++}, at: fuse_dev_do_write+0x2343/0x2bc0 fs/fuse/dev.c:1894 #1: 00000000adec798a (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 00000000adec798a (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0xaa/0x660 fs/fuse/dir.c:987 stack backtrace: CPU: 1 PID: 26102 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_deadlock_bug kernel/locking/lockdep.c:1764 [inline] check_deadlock kernel/locking/lockdep.c:1808 [inline] validate_chain kernel/locking/lockdep.c:2404 [inline] __lock_acquire.cold+0x121/0x57e kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 down_write+0x34/0x90 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:748 [inline] fuse_reverse_inval_entry+0x2e1/0x660 fs/fuse/dir.c:1006 fuse_notify_delete fs/fuse/dev.c:1585 [inline] fuse_notify fs/fuse/dev.c:1819 [inline] fuse_dev_do_write+0x239e/0x2bc0 fs/fuse/dev.c:1894 fuse_dev_write+0x153/0x1e0 fs/fuse/dev.c:1978 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f667fd83639 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f667e2d5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f667fea4050 RCX: 00007f667fd83639 RDX: 000000000000002a RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00007f667fddeae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdecc7525f R14: 00007f667e2d5300 R15: 0000000000022000 audit: type=1804 audit(1668556777.795:282): pid=26124 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir303793919/syzkaller.tK0nhU/525/bus" dev="sda1" ino=15591 res=1 IPVS: ftp: loaded support on port[0] = 21 overlayfs: failed to resolve './file0': -2 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 overlayfs: failed to resolve './file0': -2 netlink: 72 bytes leftover after parsing attributes in process `syz-executor.1'. overlayfs: failed to resolve './file0': -2 IPVS: ftp: loaded support on port[0] = 21 audit: type=1804 audit(1668556779.425:283): pid=26279 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir1961319128/syzkaller.4DSZHZ/118/bus" dev="sda1" ino=15569 res=1 IPVS: ftp: loaded support on port[0] = 21 overlayfs: failed to resolve './file0': -2 overlayfs: failed to resolve './file0': -2 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 audit: type=1804 audit(1668556780.635:284): pid=26366 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir1961319128/syzkaller.4DSZHZ/119/bus" dev="sda1" ino=15560 res=1 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. bond4 (uninitialized): Released all slaves audit: type=1804 audit(1668556781.775:285): pid=26445 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir1961319128/syzkaller.4DSZHZ/120/bus" dev="sda1" ino=15636 res=1 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. bond4 (uninitialized): Released all slaves ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. audit: type=1804 audit(1668556782.795:286): pid=26489 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir1961319128/syzkaller.4DSZHZ/121/bus" dev="sda1" ino=13880 res=1 bond4 (uninitialized): Released all slaves netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. bond4 (uninitialized): Released all slaves