overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './file1': -2 overlayfs: unrecognized mount option "Sower`Ir=.:fiL" or missing value overlayfs: failed to resolve './file0': -2 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/984 is trying to acquire lock: 0000000092f460cb (&ovl_i_mutex_dir_key[depth]){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] 0000000092f460cb (&ovl_i_mutex_dir_key[depth]){++++}, at: do_last fs/namei.c:3326 [inline] 0000000092f460cb (&ovl_i_mutex_dir_key[depth]){++++}, at: path_openat+0x17ec/0x2df0 fs/namei.c:3537 but task is already holding lock: 00000000b3732467 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] 00000000b3732467 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&sig->cred_guard_mutex){+.+.}: do_io_accounting fs/proc/base.c:2750 [inline] proc_tgid_io_accounting+0x1cf/0x7f0 fs/proc/base.c:2799 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4e0/0x11c0 fs/seq_file.c:232 __vfs_read+0xf7/0x750 fs/read_write.c:416 vfs_read+0x194/0x3c0 fs/read_write.c:452 ksys_read+0x12b/0x2a0 fs/read_write.c:579 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (&p->lock){+.+.}: seq_read+0x6b/0x11c0 fs/seq_file.c:164 proc_reg_read+0x1bd/0x2d0 fs/proc/inode.c:231 do_loop_readv_writev fs/read_write.c:701 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_read+0x471/0x630 fs/read_write.c:925 vfs_readv+0xe5/0x150 fs/read_write.c:987 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x457/0xa00 fs/splice.c:417 do_splice_to+0x10e/0x160 fs/splice.c:881 splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959 do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (sb_writers#3){.+.+}: sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_create_object+0x96/0x290 fs/overlayfs/dir.c:602 lookup_open+0x893/0x1a20 fs/namei.c:3235 do_last fs/namei.c:3327 [inline] path_openat+0x1094/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&ovl_i_mutex_dir_key[depth]){++++}: down_read+0x36/0x80 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:758 [inline] do_last fs/namei.c:3326 [inline] path_openat+0x17ec/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_open_execat+0x11d/0x5b0 fs/exec.c:853 __do_execve_file+0x1a8b/0x2360 fs/exec.c:1770 do_execveat_common fs/exec.c:1879 [inline] do_execve+0x35/0x50 fs/exec.c:1896 __do_sys_execve fs/exec.c:1977 [inline] __se_sys_execve fs/exec.c:1972 [inline] __x64_sys_execve+0x7c/0xa0 fs/exec.c:1972 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: &ovl_i_mutex_dir_key[depth] --> &p->lock --> &sig->cred_guard_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sig->cred_guard_mutex); lock(&p->lock); lock(&sig->cred_guard_mutex); lock(&ovl_i_mutex_dir_key[depth]); *** DEADLOCK *** 1 lock held by syz-executor.4/984: #0: 00000000b3732467 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] #0: 00000000b3732467 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 stack backtrace: CPU: 0 PID: 984 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 down_read+0x36/0x80 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:758 [inline] do_last fs/namei.c:3326 [inline] path_openat+0x17ec/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_open_execat+0x11d/0x5b0 fs/exec.c:853 __do_execve_file+0x1a8b/0x2360 fs/exec.c:1770 do_execveat_common fs/exec.c:1879 [inline] do_execve+0x35/0x50 fs/exec.c:1896 __do_sys_execve fs/exec.c:1977 [inline] __se_sys_execve fs/exec.c:1972 [inline] __x64_sys_execve+0x7c/0xa0 fs/exec.c:1972 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7feb6f7f1669 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:00007feb6e144168 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00007feb6f913050 RCX: 00007feb6f7f1669 RDX: 0000000020000600 RSI: 0000000020000500 RDI: 0000000020000440 RBP: 00007feb6f84c560 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcc86bce4f R14: 00007feb6e144300 R15: 0000000000022000 overlayfs: failed to resolve './file1': -2 overlayfs: missing 'lowerdir' overlayfs: unrecognized mount option "Y" or missing value overlayfs: missing 'lowerdir' overlayfs: unrecognized mount option "Y" or missing value overlayfs: missing 'lowerdir' overlayfs: failed to resolve './file0': -2 overlayfs: failed to resolve './file0': -2 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "Y" or missing value overlayfs: failed to resolve './file0': -2 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: failed to resolve './file0': -2 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. overlayfs: failed to resolve './file0': -2 tmpfs: No value for mount option './file1' netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. overlayfs: unrecognized mount option "lowerdir" or missing value overlayfs: failed to resolve './file0': -2 overlayfs: failed to resolve './file1': -2 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. overlayfs: unrecognized mount option "lowerdir" or missing value overlayfs: overlapping lowerdir path overlayfs: unrecognized mount option "uppdir=./bus" or missing value overlayfs: failed to resolve './file1': -2 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. overlayfs: failed to resolve './file1': -2 overlayfs: unrecognized mount option "uppdir=./bus" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: unrecognized mount option "defcontext=unconfined_u" or missing value overlayfs: failed to resolve 'file0.': -2 overlayfs: unrecognized mount option "00000000000000000000" or missing value overlayfs: unrecognized mount option "00000000000000000000" or missing value overlayfs: unrecognized mount option "defcontext=unconfined_u" or missing value overlayfs: failed to resolve 'file0.': -2 overlayfs: missing 'lowerdir' overlayfs: overlapping lowerdir path overlayfs: unrecognized mount option "00000000000000000000" or missing value overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: './bus' not a directory overlayfs: overlapping lowerdir path overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: './bus' not a directory overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: failed to resolve './file1': -2 overlayfs: missing 'lowerdir' overlayfs: overlapping lowerdir path overlayfs: missing 'lowerdir' overlayfs: overlapping lowerdir path overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: overlapping lowerdir path overlayfs: missing 'lowerdir' overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: missing 'lowerdir' overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: unrecognized mount option "lower" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "lower" or missing value overlayfs: unrecognized mount option "lower" or missing value overlayfs: overlapping lowerdir path overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: lowerdir is in-use as upperdir/workdir of another mount, mount with '-o index=off' to override exclusive upperdir protection. overlayfs: unrecognized mount option "lnwerdir=.:file0dKxDl˧Ijز_TVIxOgۈm6~; Q3N˷FvٴIMK3=WBTϕIq"/#7xqu@ e񠘁\^b7}Sp)a" or missing value overlayfs: failed to resolve './fil': -2 overlayfs: unrecognized mount option "lnwerdir=.:file0dKxDl˧Ijز_TVIxOgۈm6~; Q3N˷FvٴIMK3=WBTϕIq"/#7xqu@ e񠘁\^b7}Sp)a" or missing value overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './fil': -2 overlayfs: failed to resolve './fil': -2 overlayfs: unrecognized mount option "lnwerdir=.:file0dKxDl˧Ijز_TVIxOgۈm6~; Q3N˷FvٴIMK3=WBTϕIq"/#7xqu@ e񠘁\^b7}Sp)a" or missing value overlayfs: failed to resolve './file': -2 overlayfs: unrecognized mount option "lower" or missing value overlayfs: failed to resolve './file': -2 overlayfs: failed to resolve './file': -2 overlayfs: overlapping lowerdir path overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: failed to resolve 'filE0': -2 overlayfs: failed to resolve 'filE0': -2 overlayfs: failed to resolve 'filE0': -2 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: failed to resolve 'file0': -2 overlayfs: failed to resolve './file0': -2 overlayfs: failed to resolve 'file0': -2 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: failed to resolve './file0': -2 overlayfs: overlapping lowerdir path overlayfs: failed to resolve 'file0': -2 overlayfs: overlapping lowerdir path 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. 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. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. EXT4-fs warning (device sda1): ext4_ioctl:814: Setting inode version is not supported with metadata_csum enabled. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. EXT4-fs warning (device sda1): ext4_ioctl:814: Setting inode version is not supported with metadata_csum enabled. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. EXT4-fs warning (device sda1): ext4_ioctl:814: Setting inode version is not supported with metadata_csum enabled. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: overlapping lowerdir path EXT4-fs warning (device sda1): ext4_ioctl:814: Setting inode version is not supported with metadata_csum enabled. 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. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. EXT4-fs warning (device sda1): ext4_group_add:1682: No reserved GDT blocks, can't resize 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. 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. overlayfs: filesystem on './bus' not supported as upperdir erofs: read_super, device -> /dev/md0 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. erofs: options -> \ erofs: cannot read erofs superblock overlayfs: unrecognized mount option "lowerdia.:file0" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: failed to resolve './file0': -2 overlayfs: unrecognized mount option "lowerdia.:file0" or missing value erofs: read_super, device -> /dev/md0 erofs: options -> \ erofs: cannot read erofs superblock overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. erofs: read_super, device -> /dev/md0 erofs: options -> \ erofs: cannot read erofs superblock overlayfs: unrecognized mount option "lowerdia.:file0" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. erofs: read_super, device -> /dev/md0 erofs: options -> \ erofs: cannot read erofs superblock overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "lo=.:$il" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "lo=.:$il" or missing value 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. overlayfs: unrecognized mount option "lo=.:$il" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off.