FAT-fs (loop1): bogus logical sector size 384 FAT-fs (loop1): Can't find a valid FAT filesystem ============================================ WARNING: possible recursive locking detected 4.19.211-syzkaller #0 Not tainted -------------------------------------------- syz-executor.0/16842 is trying to acquire lock: 000000002d68a0c2 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] 000000002d68a0c2 (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0x2e1/0x660 fs/fuse/dir.c:1006 but task is already holding lock: 00000000a0c3cbf3 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] 00000000a0c3cbf3 (&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.0/16842: #0: 00000000e361a05c (&fc->killsb){++++}, at: fuse_notify_delete fs/fuse/dev.c:1582 [inline] #0: 00000000e361a05c (&fc->killsb){++++}, at: fuse_notify fs/fuse/dev.c:1819 [inline] #0: 00000000e361a05c (&fc->killsb){++++}, at: fuse_dev_do_write+0x2343/0x2bc0 fs/fuse/dev.c:1894 #1: 00000000a0c3cbf3 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 00000000a0c3cbf3 (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0xaa/0x660 fs/fuse/dir.c:987 stack backtrace: CPU: 0 PID: 16842 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 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: 0033:0x7f95b3e30209 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:00007f95b27a5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f95b3f42f60 RCX: 00007f95b3e30209 RDX: 000000000000002c RSI: 00000000200000c0 RDI: 0000000000000004 RBP: 00007f95b3e8a161 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe66d4efef R14: 00007f95b27a5300 R15: 0000000000022000 FAT-fs (loop1): bogus logical sector size 448 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 576 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 640 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 704 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 768 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 801 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 832 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 896 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 960 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1026 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1027 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1028 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1029 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1030 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1031 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1032 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1033 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1035 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1036 FAT-fs (loop1): Can't find a valid FAT filesystem MTD: Attempt to mount non-MTD device "/dev/loop4" cramfs: wrong magic FAT-fs (loop1): bogus logical sector size 1037 FAT-fs (loop1): Can't find a valid FAT filesystem MTD: Attempt to mount non-MTD device "/dev/loop4" cramfs: wrong magic FAT-fs (loop1): bogus logical sector size 1038 FAT-fs (loop1): Can't find a valid FAT filesystem MTD: Attempt to mount non-MTD device "/dev/loop4" cramfs: wrong magic FAT-fs (loop1): bogus logical sector size 1039 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1040 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1041 FAT-fs (loop1): Can't find a valid FAT filesystem tmpfs: Bad value 'interleave=relative:' for mount option 'mpol' FAT-fs (loop1): bogus logical sector size 1042 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1043 FAT-fs (loop1): Can't find a valid FAT filesystem netlink: 84 bytes leftover after parsing attributes in process `syz-executor.4'. FAT-fs (loop1): bogus logical sector size 1044 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1045 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1046 FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus logical sector size 1047 FAT-fs (loop1): Can't find a valid FAT filesystem