overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "lowerdir=" or missing value overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: filesystem on './file0' not supported as upperdir ====================================================== WARNING: possible circular locking dependency detected 4.14.139 #35 Not tainted ------------------------------------------------------ syz-executor.2/28668 is trying to acquire lock: (&ovl_i_mutex_dir_key[depth]#3){++++}, at: [] inode_lock_shared include/linux/fs.h:728 [inline] (&ovl_i_mutex_dir_key[depth]#3){++++}, at: [] lookup_slow+0x138/0x440 fs/namei.c:1673 but task is already holding lock: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds+0x55/0x120 fs/exec.c:1389 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&sig->cred_guard_mutex){+.+.}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3991 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_interruptible_nested+0x16/0x20 kernel/locking/mutex.c:930 proc_pid_attr_write+0x163/0x290 fs/proc/base.c:2585 __vfs_write+0x105/0x6b0 fs/read_write.c:480 __kernel_write+0xfc/0x370 fs/read_write.c:501 write_pipe_buf+0x148/0x1c0 fs/splice.c:797 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x348/0x780 fs/splice.c:626 splice_from_pipe+0xf0/0x150 fs/splice.c:661 default_file_splice_write+0x3c/0x80 fs/splice.c:809 do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0xd92/0x1430 fs/splice.c:1382 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #3 (&pipe->mutex/1){+.+.}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3991 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 pipe_lock_nested fs/pipe.c:67 [inline] pipe_lock+0x63/0x80 fs/pipe.c:75 iter_file_splice_write+0x15e/0xad0 fs/splice.c:699 do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0xd92/0x1430 fs/splice.c:1382 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #2 (sb_writers#4){.+.+}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3991 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+0x1ae/0x2f0 fs/super.c:1363 sb_start_write include/linux/fs.h:1548 [inline] mnt_want_write+0x3f/0xb0 fs/namespace.c:386 ovl_want_write+0x76/0xa0 fs/overlayfs/util.c:25 ovl_xattr_set+0x4f/0x270 fs/overlayfs/inode.c:214 ovl_other_xattr_set+0x39/0x50 fs/overlayfs/super.c:800 __vfs_setxattr+0xd8/0x130 fs/xattr.c:150 __vfs_setxattr_noperm+0x102/0x3c0 fs/xattr.c:181 vfs_setxattr+0xc5/0xf0 fs/xattr.c:224 setxattr+0x1de/0x350 fs/xattr.c:453 path_setxattr+0x11f/0x140 fs/xattr.c:472 SYSC_lsetxattr fs/xattr.c:494 [inline] SyS_lsetxattr+0x38/0x50 fs/xattr.c:490 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #1 (&ovl_i_mutex_dir_key[depth]#2){++++}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3991 down_write_killable+0x3b/0xc0 kernel/locking/rwsem.c:68 iterate_dir+0x390/0x5f0 fs/readdir.c:43 ovl_dir_read fs/overlayfs/readdir.c:306 [inline] ovl_dir_read_merged+0x153/0x440 fs/overlayfs/readdir.c:355 ovl_cache_get fs/overlayfs/readdir.c:407 [inline] ovl_iterate+0x628/0xad0 fs/overlayfs/readdir.c:704 iterate_dir+0x47f/0x5f0 fs/readdir.c:54 SYSC_getdents64 fs/readdir.c:315 [inline] SyS_getdents64+0x130/0x240 fs/readdir.c:296 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 (&ovl_i_mutex_dir_key[depth]#3){++++}: check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3991 down_read+0x3b/0xb0 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:728 [inline] lookup_slow+0x138/0x440 fs/namei.c:1673 walk_component+0x698/0x1d00 fs/namei.c:1824 link_path_walk+0x81f/0x10a0 fs/namei.c:2153 path_openat+0x189/0x3f70 fs/namei.c:3565 do_filp_open+0x18e/0x250 fs/namei.c:3600 do_open_execat+0xe7/0x4a0 fs/exec.c:849 do_execveat_common.isra.0+0x6d2/0x1dd0 fs/exec.c:1740 do_execveat fs/exec.c:1858 [inline] SYSC_execveat fs/exec.c:1939 [inline] SyS_execveat+0x4f/0x60 fs/exec.c:1931 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 other info that might help us debug this: Chain exists of: &ovl_i_mutex_dir_key[depth]#3 --> &pipe->mutex/1 --> &sig->cred_guard_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sig->cred_guard_mutex); lock(&pipe->mutex/1); lock(&sig->cred_guard_mutex); lock(&ovl_i_mutex_dir_key[depth]#3); *** DEADLOCK *** 1 lock held by syz-executor.2/28668: #0: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds+0x55/0x120 fs/exec.c:1389 stack backtrace: CPU: 1 PID: 28668 Comm: syz-executor.2 Not tainted 4.14.139 #35 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x138/0x19c lib/dump_stack.c:53 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3991 down_read+0x3b/0xb0 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:728 [inline] lookup_slow+0x138/0x440 fs/namei.c:1673 walk_component+0x698/0x1d00 fs/namei.c:1824 link_path_walk+0x81f/0x10a0 fs/namei.c:2153 path_openat+0x189/0x3f70 fs/namei.c:3565 do_filp_open+0x18e/0x250 fs/namei.c:3600 do_open_execat+0xe7/0x4a0 fs/exec.c:849 do_execveat_common.isra.0+0x6d2/0x1dd0 fs/exec.c:1740 do_execveat fs/exec.c:1858 [inline] SYSC_execveat fs/exec.c:1939 [inline] SyS_execveat+0x4f/0x60 fs/exec.c:1931 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459879 RSP: 002b:00007f483c736c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000142 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459879 RDX: 0000000020000440 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000001000 R09: 0000000000000000 R10: 0000000020000580 R11: 0000000000000246 R12: 00007f483c7376d4 R13: 00000000004bff90 R14: 00000000004d1f48 R15: 00000000ffffffff overlayfs: filesystem on './file0' not supported as upperdir overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: maximum fs stacking depth exceeded kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env overlayfs: filesystem on './file0' not supported as upperdir overlayfs: fs on 'file0' does not support file handles, falling back to index=off. kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' overlayfs: maximum fs stacking depth exceeded overlayfs: filesystem on './file0' not supported as upperdir kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' overlayfs: filesystem on './file0' not supported as upperdir overlayfs: fs on 'file0' does not support file handles, falling back to index=off. kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' overlayfs: filesystem on './file0' not supported as upperdir overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: missing 'lowerdir' kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env overlayfs: unrecognized mount option "Z`]" or missing value overlayfs: filesystem on './file0' not supported as upperdir overlayfs: fs on 'file0' does not support file handles, falling back to index=off. kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path = '/devices/virtual/block/loop4' overlayfs: maximum fs stacking depth exceeded kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "y8ueperlowerdir=./file1" or missing value kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path = '/devices/virtual/block/loop3' overlayfs: filesystem on './file0' not supported as upperdir overlayfs: unrecognized mount option "y8ueperlowerdir=./file1" or missing value overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: maximum fs stacking depth exceeded kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' overlayfs: filesystem on './file0' not supported as upperdir kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env overlayfs: unrecognized mount option "4perdir=./fine0" or missing value kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path = '/devices/virtual/block/loop5' overlayfs: unrecognized mount option "4perdir=./fine0" or missing value overlayfs: fs on 'file0' does not support file handles, falling back to index=off. kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path = '/devices/virtual/block/loop3' overlayfs: filesystem on './file0' not supported as upperdir kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path = '/devices/virtual/block/loop4' overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: filesystem on './file0' not supported as upperdir overlayfs: filesystem on './file0' not supported as upperdir overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: maximum fs stacking depth exceeded overlayfs: unrecognized mount option "lo" or missing value overlayfs: missing 'workdir' kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env overlayfs: unrecognized mount option "01777777777777777777777" or missing value kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' overlayfs: unrecognized mount option "lo" or missing value overlayfs: missing 'workdir' overlayfs: fs on 'file0' does not support file handles, falling back to index=off. kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path = '/devices/virtual/block/loop5' overlayfs: unrecognized mount option "01777777777777777777777" or missing value kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env overlayfs: missing 'workdir' kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env overlayfs: missing 'workdir' kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env overlayfs: unrecognized mount option "upperdirؑ70tPR=" or missing value kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' overlayfs: unrecognized mount option "upperdirؑ70tPR=" or missing value kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env overlayfs: filesystem on './file0' not supported as upperdir kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path = '/devices/virtual/block/loop5' overlayfs: fs on 'file0' does not support file handles, falling back to index=off. kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: filesystem on './file0' not supported as upperdir overlayfs: unrecognized mount option "lowezdir=./file1" or missing value overlayfs: filesystem on './file0' not supported as upperdir overlayfs: fs on 'file0' does not support file handles, falling back to index=off. kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env overlayfs: unrecognized mount option "lowezdir=./file1" or missing value overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: maximum fs stacking depth exceeded overlayfs: maximum fs stacking depth exceeded kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path = '/devices/virtual/block/loop3' overlayfs: fs on 'file0' does not support file handles, falling back to index=off. kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env overlayfs: missing 'lowerdir' kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' overlayfs: missing 'lowerdir' kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path = '/devices/virtual/block/loop5' overlayfs: failed to resolve './file1': -2 overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: filesystem on './file0' not supported as upperdir overlayfs: fs on 'file0' does not support file handles, falling back to index=off. kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env overlayfs: filesystem on './file0' not supported as upperdir kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: maximum fs stacking depth exceeded kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' overlayfs: filesystem on './file0' not supported as upperdir overlayfs: unrecognized mount option "uppime0" or missing value overlayfs: unrecognized mount option "lowerdSr=.:file 0R%˰@"'t{w$WFKµv?.S$ gG@XbnhԽvB gY8; qcȂ9f*" or missing value overlayfs: filesystem on './file0' not supported as upperdir overlayfs: unrecognized mount option "xA4e5u# P#ghHK> gY8; qcȂ9f*" or missing value overlayfs: fs on 'file0' does not support file handles, falling back to index=off. kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path = '/devices/virtual/misc/kvm' overlayfs: filesystem on './file0' not supported as upperdir overlayfs: fs on 'file0' does not support file handles, falling back to index=off. kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env overlayfs: unrecognized mount option "lowerdSr=.:file 0R%˰@"'t{w$WFKµv?.S$ gG@XbnhԽvBK1\~.+3<]" or missing value kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path = '/devices/virtual/block/loop4' overlayfs: filesystem on './file0' not supported as upperdir overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "lowerdworK1\~.+3<]" or missing value overlayfs: unrecognized mount option "lowerdSr=.:file 0R%˰@"'t{w$WFKµv?.S$ gG@XbnhԽvB