overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "lowerd\r=." or missing value ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/17565 is trying to acquire lock: 00000000b3bf4adc (&ovl_i_mutex_dir_key[depth]#2){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] 00000000b3bf4adc (&ovl_i_mutex_dir_key[depth]#2){++++}, at: lookup_slow fs/namei.c:1688 [inline] 00000000b3bf4adc (&ovl_i_mutex_dir_key[depth]#2){++++}, at: walk_component+0x798/0xda0 fs/namei.c:1811 but task is already holding lock: 0000000026dec610 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] 0000000026dec610 (&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){+.+.}: lock_trace fs/proc/base.c:402 [inline] proc_pid_personality+0x4a/0x170 fs/proc/base.c:2938 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4e0/0x11c0 fs/seq_file.c:232 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 -> #2 (&p->lock){+.+.}: seq_read+0x6b/0x11c0 fs/seq_file.c:164 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 overlayfs: unrecognized mount option "lowerdi" or missing value -> #1 (sb_writers#3){.+.+}: sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_setattr+0xdd/0x920 fs/overlayfs/inode.c:30 notify_change+0x70b/0xfc0 fs/attr.c:334 chown_common+0x4a9/0x550 fs/open.c:651 do_fchownat+0x126/0x1e0 fs/open.c:681 __do_sys_chown fs/open.c:701 [inline] __se_sys_chown fs/open.c:699 [inline] __x64_sys_chown+0x77/0xb0 fs/open.c:699 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] lookup_slow fs/namei.c:1688 [inline] walk_component+0x798/0xda0 fs/namei.c:1811 link_path_walk.part.0+0x901/0x1230 fs/namei.c:2142 link_path_walk fs/namei.c:2073 [inline] path_openat+0x1db/0x2df0 fs/namei.c:3536 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_execveat+0x3d/0x50 fs/exec.c:1907 __do_sys_execveat fs/exec.c:1988 [inline] __se_sys_execveat fs/exec.c:1980 [inline] __x64_sys_execveat+0xe1/0x120 fs/exec.c:1980 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 overlayfs: unrecognized mount option "0177777777777777777777701777777777777777777777" or missing value 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.2/17565: #0: 0000000026dec610 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] #0: 0000000026dec610 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 overlayfs: unrecognized mount option "lowerdi/=." or missing value stack backtrace: CPU: 0 PID: 17565 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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] lookup_slow fs/namei.c:1688 [inline] walk_component+0x798/0xda0 fs/namei.c:1811 link_path_walk.part.0+0x901/0x1230 fs/namei.c:2142 link_path_walk fs/namei.c:2073 [inline] path_openat+0x1db/0x2df0 fs/namei.c:3536 overlayfs: unrecognized mount option "lowerdi\=." or missing value 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_execveat+0x3d/0x50 fs/exec.c:1907 __do_sys_execveat fs/exec.c:1988 [inline] __se_sys_execveat fs/exec.c:1980 [inline] __x64_sys_execveat+0xe1/0x120 fs/exec.c:1980 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7eff6b641059 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:00007eff69fb6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000142 RAX: ffffffffffffffda RBX: 00007eff6b753f60 RCX: 00007eff6b641059 RDX: 0000000020002680 RSI: 0000000020002440 RDI: 0000000000000004 RBP: 00007eff6b69b08d R08: 0000000000001000 R09: 0000000000000000 R10: 0000000020002840 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc7b2260cf R14: 00007eff69fb6300 R15: 0000000000022000 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "lowerdir" or missing value netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. 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: 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: unrecognized mount option "lowerdir\." 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: unrecognized mount option "worÉir=./file1" or missing value overlayfs: overlapping lowerdir path overlayfs: unrecognized mount option "lowerdir=" or missing value overlayfs: overlapping lowerdir path overlayfs: unrecognized mount option "worÉir=./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: unrecognized mount option "worÉir=./file1" or missing value overlayfs: filesystem on '/' not supported netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. 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: empty lowerdir 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: maximum fs stacking depth exceeded 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: 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 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 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. overlayfs: empty lowerdir overlayfs: maximum fs stacking depth exceeded 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: 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: overlapping lowerdir path IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready 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: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready 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 "appraise_type=imasig" or missing value overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: failed to resolve './bgs': -2 overlayfs: unrecognized mount option "appraise_type=imasig" or missing value overlayfs: unrecognized mount option "LI