overlayfs: unrecognized mount option ".:file0=0!7ېw •w9ʥ=%`QZvĈ+GaɪDR ܼ> 6 ȩ#X8돣5cdL˂)$h" or missing value ====================================================== WARNING: possible circular locking dependency detected overlayfs: './file1' not a directory 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/1351 is trying to acquire lock: 0000000050a29bd4 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] 0000000050a29bd4 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: do_last fs/namei.c:3326 [inline] 0000000050a29bd4 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: path_openat+0x17ec/0x2df0 fs/namei.c:3537 but task is already holding lock: 00000000d06537bf (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] 00000000d06537bf (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 which lock already depends on the new lock. overlayfs: overlapping lowerdir path the existing dependency chain (in reverse order) is: -> #3 (&sig->cred_guard_mutex){+.+.}: do_io_accounting fs/proc/base.c:2750 [inline] proc_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2793 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 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. 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]#2){++++}: 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]#2 --> &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]#2); *** DEADLOCK *** 1 lock held by syz-executor.4/1351: #0: 00000000d06537bf (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] #0: 00000000d06537bf (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 stack backtrace: CPU: 0 PID: 1351 Comm: syz-executor.4 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_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: 0033:0x7facaa28f209 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:00007faca8be3168 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00007facaa3a2030 RCX: 00007facaa28f209 RDX: 0000000020000740 RSI: 0000000020000600 RDI: 0000000020000240 RBP: 00007facaa2e9161 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc3d00f8ef R14: 00007faca8be3300 R15: 0000000000022000 overlayfs: unrecognized mount option ".:file0=0!7ېw •w9ʥ=%`QZvĈ+GaɪDR ܼ> 6 ȩ#X8돣5cdL˂)$h" or missing value overlayfs: './file1' 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: 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: 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 './bus': -2 netlink: 36 bytes leftover after parsing attributes in process `syz-executor.2'. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. netlink: 36 bytes leftover after parsing attributes in process `syz-executor.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. netlink: 36 bytes leftover after parsing attributes in process `syz-executor.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: 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: 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: 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. 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: overlapping lowerdir path overlayfs: at least 2 lowerdir are needed while upperdir nonexistent 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: at least 2 lowerdir are needed while upperdir nonexistent 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: overlapping lowerdir path overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: overlapping lowerdir path overlayfs: unrecognized mount option "l0" 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: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. EXT4-fs (loop1): VFS: Can't find ext4 filesystem overlayfs: overlapping lowerdir path overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. netlink: 64 bytes leftover after parsing attributes in process `syz-executor.2'. overlayfs: unrecognized mount option "uppe" or missing value netlink: 64 bytes leftover after parsing attributes in process `syz-executor.2'. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: overlapping lowerdir path EXT4-fs (loop1): VFS: Can't find ext4 filesystem overlayfs: overlapping lowerdir path netlink: 64 bytes leftover after parsing attributes in process `syz-executor.2'. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "uppe" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. EXT4-fs (loop1): VFS: Can't find ext4 filesystem overlayfs: failed to resolve './file1': -2 overlayfs: at least 2 lowerdir are needed while upperdir nonexistent 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: overlapping lowerdir path netlink: 28 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 28 bytes leftover after parsing attributes in process `syz-executor.2'. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. netlink: 28 bytes leftover after parsing attributes in process `syz-executor.2'. overlayfs: failed to resolve './file1': -2 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. netlink: 28 bytes leftover after parsing attributes in process `syz-executor.2'. overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: failed to resolve './file1': -2 overlayfs: maximum fs stacking depth exceeded overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: maximum fs stacking depth exceeded 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: failed to resolve './file1': -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: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. 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. (syz-executor.1,2674,1):ocfs2_parse_options:1499 ERROR: Unrecognized mount option "]" or missing value (syz-executor.1,2674,1):ocfs2_fill_super:1225 ERROR: status = -22 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: 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. overlayfs: overlapping lowerdir path overlayfs: unrecognized mount option "" or missing value overlayfs: failed to resolve './file0': -2 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. FAT-fs (loop1): Unrecognized mount option "smackfshat=overlay" or missing value overlayfs: overlapping lowerdir path netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'. overlayfs: overlapping lowerdir path overlayfs: failed to resolve 'file0': -2 overlayfs: overlapping lowerdir path overlayfs: failed to resolve './file0': -2 FAT-fs (loop1): Unrecognized mount option "smackfshat=overlay" or missing value netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'. overlayfs: unrecognized mount option "upper񡉶dir=./bus" or missing value overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: unrecognized mount option "upperdar=./bus" or missing value overlayfs: unrecognized mount option "upper񡉶dir=./bus" or missing value overlayfs: unrecognized mount option "upperdar=./bus" or missing value overlayfs: unrecognized mount option "upper񡉶dir=./bus" or missing value 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: unrecognized mount option "upperdar=./bus" or missing value overlayfs: unrecognized mount option "-workdir=./file1" or missing value overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: unrecognized mount option "-workdir=./file1" or missing value overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: unrecognized mount option "-workdir=./file1" or missing value 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: 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