overlayfs: fs on './file0' does not support file handles, falling back to index=off. ====================================================== WARNING: possible circular locking dependency detected 4.14.292-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/10404 is trying to acquire lock: (&ovl_i_mutex_dir_key[depth]){++++}, at: [] inode_lock_shared include/linux/fs.h:729 [inline] (&ovl_i_mutex_dir_key[depth]){++++}, at: [] lookup_slow+0x129/0x400 fs/namei.c:1674 but task is already holding lock: (&oi->lock){+.+.}, at: [] ovl_nlink_start+0x22f/0x460 fs/overlayfs/util.c:523 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&oi->lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 ovl_copy_up_start+0x40/0xe0 fs/overlayfs/util.c:318 ovl_copy_up_one+0x21f/0x910 fs/overlayfs/copy_up.c:631 ovl_copy_up_flags+0xd5/0x120 fs/overlayfs/copy_up.c:686 ovl_create_or_link+0xa2/0x1200 fs/overlayfs/dir.c:476 ovl_create_object+0x17b/0x1d0 fs/overlayfs/dir.c:550 lookup_open+0x77a/0x1750 fs/namei.c:3241 do_last fs/namei.c:3334 [inline] path_openat+0xe08/0x2970 fs/namei.c:3571 do_filp_open+0x179/0x3c0 fs/namei.c:3605 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #1 (sb_writers#3){.+.+}: 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+0x64/0x260 fs/super.c:1342 sb_start_write include/linux/fs.h:1551 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 ovl_create_object+0x75/0x1d0 fs/overlayfs/dir.c:538 lookup_open+0x77a/0x1750 fs/namei.c:3241 do_last fs/namei.c:3334 [inline] path_openat+0xe08/0x2970 fs/namei.c:3571 do_filp_open+0x179/0x3c0 fs/namei.c:3605 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&ovl_i_mutex_dir_key[depth]){++++}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 down_read+0x36/0x80 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:729 [inline] lookup_slow+0x129/0x400 fs/namei.c:1674 lookup_one_len_unlocked+0x3a0/0x410 fs/namei.c:2595 ovl_lower_positive+0x184/0x350 fs/overlayfs/namei.c:783 ovl_rename+0x47c/0xe50 fs/overlayfs/dir.c:968 vfs_rename+0x560/0x1820 fs/namei.c:4498 SYSC_renameat2 fs/namei.c:4646 [inline] SyS_renameat2+0x95b/0xad0 fs/namei.c:4535 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb other info that might help us debug this: Chain exists of: &ovl_i_mutex_dir_key[depth] --> sb_writers#3 --> &oi->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&oi->lock); lock(sb_writers#3); lock(&oi->lock); lock(&ovl_i_mutex_dir_key[depth]); *** DEADLOCK *** 8 locks held by syz-executor.5/10404: #0: (sb_writers#15){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] #0: (sb_writers#15){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 #1: (&type->s_vfs_rename_key#3){+.+.}, at: [] lock_rename+0x54/0x280 fs/namei.c:2889 #2: (&ovl_i_mutex_dir_key[depth]#2/1){+.+.}, at: [] inode_lock_nested include/linux/fs.h:754 [inline] #2: (&ovl_i_mutex_dir_key[depth]#2/1){+.+.}, at: [] lock_rename+0xa0/0x280 fs/namei.c:2893 #3: (&ovl_i_mutex_dir_key[depth]#2/2){+.+.}, at: [] inode_lock_nested include/linux/fs.h:754 [inline] #3: (&ovl_i_mutex_dir_key[depth]#2/2){+.+.}, at: [] lock_rename+0xd4/0x280 fs/namei.c:2894 #4: (&ovl_i_mutex_key[depth]){+.+.}, at: [] inode_lock include/linux/fs.h:719 [inline] #4: (&ovl_i_mutex_key[depth]){+.+.}, at: [] lock_two_nondirectories+0xca/0xf0 fs/inode.c:990 #5: (&ovl_i_mutex_key[depth]/4){+.+.}, at: [] inode_lock_nested include/linux/fs.h:754 [inline] #5: (&ovl_i_mutex_key[depth]/4){+.+.}, at: [] lock_two_nondirectories+0xb2/0xf0 fs/inode.c:992 #6: (sb_writers#3){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] #6: (sb_writers#3){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 #7: (&oi->lock){+.+.}, at: [] ovl_nlink_start+0x22f/0x460 fs/overlayfs/util.c:523 stack backtrace: CPU: 1 PID: 10404 Comm: syz-executor.5 Not tainted 4.14.292-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 down_read+0x36/0x80 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:729 [inline] lookup_slow+0x129/0x400 fs/namei.c:1674 lookup_one_len_unlocked+0x3a0/0x410 fs/namei.c:2595 ovl_lower_positive+0x184/0x350 fs/overlayfs/namei.c:783 ovl_rename+0x47c/0xe50 fs/overlayfs/dir.c:968 vfs_rename+0x560/0x1820 fs/namei.c:4498 SYSC_renameat2 fs/namei.c:4646 [inline] SyS_renameat2+0x95b/0xad0 fs/namei.c:4535 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fa5501c7409 RSP: 002b:00007fa54eb1b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007fa5502da050 RCX: 00007fa5501c7409 RDX: 0000000000000000 RSI: 0000000020000240 RDI: 00000000200002c0 RBP: 00007fa550222367 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe6391a6bf R14: 00007fa54eb1b300 R15: 0000000000022000 EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready EXT4-fs error (device loop3): ext4_fill_super:4382: inode #2: comm syz-executor.3: iget: bogus i_mode (36355) EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready EXT4-fs error (device loop3): ext4_fill_super:4382: inode #2: comm syz-executor.3: iget: bogus i_mode (36355) IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed overlayfs: fs on 'file0' does not support file handles, falling back to index=off. IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready EXT4-fs error (device loop3): ext4_fill_super:4382: inode #2: comm syz-executor.3: iget: bogus i_mode (36355) overlayfs: fs on 'file0' does not support file handles, falling back to index=off. EXT4-fs (loop3): get root inode failed IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready EXT4-fs (loop3): mount failed IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready EXT4-fs error (device loop3): ext4_fill_super:4382: inode #2: comm syz-executor.3: iget: bogus i_mode (36355) IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready overlayfs: fs on './file0' does not support file handles, falling back to index=off. EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready overlayfs: fs on 'file0' does not support file handles, falling back to index=off. IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready overlayfs: fs on './file0' does not support file handles, falling back to index=off. IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready SQUASHFS error: zstd decompression error: 2 NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024) SQUASHFS error: zstd decompression failed, data probably corrupt NILFS (loop3): unrecognized mount option "n" overlayfs: fs on 'file0' does not support file handles, falling back to index=off. SQUASHFS error: squashfs_read_data failed to read block 0x539 SQUASHFS error: Unable to read metadata cache entry [539] overlayfs: fs on './file0' does not support file handles, falling back to index=off. SQUASHFS error: Unable to read inode 0x510000 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready hfs: invalid gid -1 hfs: unable to parse mount options hfs: invalid gid -1 hfs: unable to parse mount options IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "nfs_export=on" or missing value IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready audit: type=1800 audit(1663120637.129:20): pid=10571 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="file0" dev="sda1" ino=14117 res=0 overlayfs: fs on './file0' does not support file handles, falling back to index=off. IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready hfs: invalid gid -1 hfs: unable to parse mount options 9pnet_virtio: no channels available for device syz hfs: invalid gid -1 hfs: unable to parse mount options overlayfs: fs on 'file0' does not support file handles, falling back to index=off. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.2'. hfs: invalid gid -1 hrtimer: interrupt took 17185 ns overlayfs: fs on './file0' does not support file handles, falling back to index=off. ISOFS: Unable to identify CD-ROM format. hfs: unable to parse mount options bridge0: port 2(bridge_slave_1) entered disabled state IPVS: ftp: loaded support on port[0] = 21 ntfs: (device loop1): ntfs_fill_super(): Unable to determine device size. device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state audit: type=1800 audit(1663120638.089:21): pid=10684 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file0" dev="sda1" ino=14143 res=0 hfsplus: unable to find HFS+ superblock FAT-fs (loop3): Unrecognized mount option "check=strnŠĢār-icLpLFĘhĮĀt" or missing value bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state IPVS: ftp: loaded support on port[0] = 21 netlink: 20 bytes leftover after parsing attributes in process `syz-executor.2'. FAT-fs (loop3): Unrecognized mount option "check=strnŠĢār-icLpLFĘhĮĀt" or missing value BFS-fs: bfs_fill_super(): loop1 is unclean, continuing BFS-fs: bfs_fill_super(): Last block not available: 63 BTRFS: device label Ø devid 1 transid 7 /dev/loop1 BTRFS error (device loop1): superblock checksum mismatch netlink: 20 bytes leftover after parsing attributes in process `syz-executor.2'. BTRFS error (device loop1): open_ctree failed BTRFS: device fsid 5473bc96-4248-4e9e-b42b-ba6f1659cc83 devid 0 transid 8 /dev/loop0 BTRFS error (device loop1): superblock checksum mismatch BTRFS error (device loop1): open_ctree failed BTRFS error (device loop1): superblock checksum mismatch FAT-fs (loop3): Unrecognized mount option "check=strnŠĢār-icLpLFĘhĮĀt" or missing value BTRFS error (device loop1): open_ctree failed BTRFS error (device loop1): superblock checksum mismatch BTRFS error (device loop1): open_ctree failed netlink: 20 bytes leftover after parsing attributes in process `syz-executor.2'. FAT-fs (loop3): Unrecognized mount option "check=strnŠĢār-icLpLFĘhĮĀt" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off. BTRFS: device fsid 5473bc96-4248-4e9e-b42b-ba6f1659cc83 devid 1 transid 8 /dev/loop0 BTRFS error (device loop0): unsupported checksum algorithm 3 BTRFS error (device loop0): superblock checksum mismatch BTRFS error (device loop0): open_ctree failed overlayfs: unrecognized mount option "nfs_export=off" or missing value