BFS-fs: bfs_fill_super(): loop5 is unclean, continuing BFS-fs: bfs_fill_super(): Superblock is corrupted ============================================ WARNING: possible recursive locking detected 4.19.211-syzkaller #0 Not tainted -------------------------------------------- syz-executor.0/24395 is trying to acquire lock: 000000005185d96c (&type->i_mutex_dir_key#17){++++}, at: inode_lock include/linux/fs.h:748 [inline] 000000005185d96c (&type->i_mutex_dir_key#17){++++}, at: fuse_reverse_inval_entry+0x2e1/0x660 fs/fuse/dir.c:1006 but task is already holding lock: 000000001fdfc57b (&type->i_mutex_dir_key#17){++++}, at: inode_lock include/linux/fs.h:748 [inline] 000000001fdfc57b (&type->i_mutex_dir_key#17){++++}, 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#17); lock(&type->i_mutex_dir_key#17); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz-executor.0/24395: #0: 00000000b428b0a2 (&fc->killsb){++++}, at: fuse_notify_delete fs/fuse/dev.c:1582 [inline] #0: 00000000b428b0a2 (&fc->killsb){++++}, at: fuse_notify fs/fuse/dev.c:1819 [inline] #0: 00000000b428b0a2 (&fc->killsb){++++}, at: fuse_dev_do_write+0x2343/0x2bc0 fs/fuse/dev.c:1894 #1: 000000001fdfc57b (&type->i_mutex_dir_key#17){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 000000001fdfc57b (&type->i_mutex_dir_key#17){++++}, at: fuse_reverse_inval_entry+0xaa/0x660 fs/fuse/dir.c:987 stack backtrace: CPU: 0 PID: 24395 Comm: syz-executor.0 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: 0033:0x7fdb021210a9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdaf8372168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fdb02241050 RCX: 00007fdb021210a9 RDX: 000000000000002a RSI: 0000000020000080 RDI: 0000000000000008 RBP: 00007fdb0217cae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe54f7b74f R14: 00007fdaf8372300 R15: 0000000000022000 BFS-fs: bfs_fill_super(): loop5 is unclean, continuing BFS-fs: bfs_fill_super(): Superblock is corrupted BFS-fs: bfs_fill_super(): loop5 is unclean, continuing BFS-fs: bfs_fill_super(): loop5 is unclean, continuing BFS-fs: bfs_fill_super(): Superblock is corrupted BFS-fs: bfs_fill_super(): loop5 is unclean, continuing netlink: 4 bytes leftover after parsing attributes in process `syz-executor.0'. audit: type=1804 audit(1672611061.016:344): pid=24548 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir2623733524/syzkaller.R69Hkz/224/bus" dev="sda1" ino=15363 res=1 device batadv1 entered promiscuous mode BFS-fs: bfs_fill_super(): Superblock is corrupted audit: type=1804 audit(1672611061.056:345): pid=24548 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir2623733524/syzkaller.R69Hkz/224/bus" dev="sda1" ino=15363 res=1 8021q: adding VLAN 0 to HW filter on device batadv1 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.0'. BFS-fs: bfs_fill_super(): loop5 is unclean, continuing BFS-fs: bfs_fill_super(): Superblock is corrupted audit: type=1804 audit(1672611061.276:346): pid=24596 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir2623733524/syzkaller.R69Hkz/225/bus" dev="sda1" ino=15362 res=1 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.0'. audit: type=1804 audit(1672611061.276:347): pid=24595 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir2623733524/syzkaller.R69Hkz/225/bus" dev="sda1" ino=15362 res=1 audit: type=1804 audit(1672611064.056:348): pid=24621 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir2623733524/syzkaller.R69Hkz/226/bus" dev="sda1" ino=15380 res=1 audit: type=1804 audit(1672611064.086:349): pid=24621 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir2623733524/syzkaller.R69Hkz/226/bus" dev="sda1" ino=15380 res=1 BFS-fs: bfs_fill_super(): loop5 is unclean, continuing audit: type=1804 audit(1672611064.096:350): pid=24621 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir2623733524/syzkaller.R69Hkz/226/bus" dev="sda1" ino=15380 res=1 audit: type=1804 audit(1672611064.316:351): pid=24650 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir3439062275/syzkaller.sTaN59/29/cgroup.controllers" dev="sda1" ino=15378 res=1 audit: type=1804 audit(1672611064.316:352): pid=24650 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir3439062275/syzkaller.sTaN59/29/cgroup.controllers" dev="sda1" ino=15378 res=1 BFS-fs: bfs_fill_super(): loop5 is unclean, continuing BFS-fs: bfs_fill_super(): loop5 is unclean, continuing BFS-fs: bfs_fill_super(): loop5 is unclean, continuing