overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 ====================================================== WARNING: possible circular locking dependency detected overlayfs: failed to resolve './file1': -2 4.19.36 #4 Not tainted ------------------------------------------------------ syz-executor.5/7034 is trying to acquire lock: 0000000080f326b3 (&acct->lock#2){+.+.}, at: acct_pin_kill+0x27/0x100 kernel/acct.c:173 but task is already holding lock: 000000007765b856 (sb_writers#4){.+.+}, at: sb_start_write include/linux/fs.h:1569 [inline] 000000007765b856 (sb_writers#4){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_writers#4){.+.+}: 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+0x20b/0x360 fs/super.c:1387 sb_start_write include/linux/fs.h:1569 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 ovl_want_write+0x76/0xa0 fs/overlayfs/util.c:24 ovl_link+0x7c/0x2d5 fs/overlayfs/dir.c:674 vfs_link+0x7a4/0xb60 fs/namei.c:4240 do_linkat+0x550/0x770 fs/namei.c:4308 __do_sys_link fs/namei.c:4337 [inline] __se_sys_link fs/namei.c:4335 [inline] __x64_sys_link+0x61/0x80 fs/namei.c:4335 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&ovl_i_mutex_key[depth]){+.+.}: down_write+0x38/0x90 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:738 [inline] ovl_write_iter+0x148/0xc20 fs/overlayfs/file.c:231 call_write_iter include/linux/fs.h:1811 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x58e/0x820 fs/read_write.c:487 __kernel_write+0x110/0x390 fs/read_write.c:506 do_acct_process+0xd37/0x1150 kernel/acct.c:520 slow_acct_process kernel/acct.c:579 [inline] acct_process+0x568/0x61e kernel/acct.c:605 do_exit+0x17c0/0x2fa0 kernel/exit.c:866 do_group_exit+0x135/0x370 kernel/exit.c:979 __do_sys_exit_group kernel/exit.c:990 [inline] __se_sys_exit_group kernel/exit.c:988 [inline] __x64_sys_exit_group+0x44/0x50 kernel/exit.c:988 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&acct->lock#2){+.+.}: lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 acct_pin_kill+0x27/0x100 kernel/acct.c:173 pin_kill+0x18f/0x860 fs/fs_pin.c:50 acct_on+0x574/0x790 kernel/acct.c:254 __do_sys_acct kernel/acct.c:286 [inline] __se_sys_acct kernel/acct.c:273 [inline] __x64_sys_acct+0xae/0x200 kernel/acct.c:273 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: &acct->lock#2 --> &ovl_i_mutex_key[depth] --> sb_writers#4 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_writers#4); lock(&ovl_i_mutex_key[depth]); lock(sb_writers#4); lock(&acct->lock#2); *** DEADLOCK *** 2 locks held by syz-executor.5/7034: #0: 000000006c0152ae (acct_on_mutex){+.+.}, at: __do_sys_acct kernel/acct.c:285 [inline] #0: 000000006c0152ae (acct_on_mutex){+.+.}, at: __se_sys_acct kernel/acct.c:273 [inline] #0: 000000006c0152ae (acct_on_mutex){+.+.}, at: __x64_sys_acct+0xa6/0x200 kernel/acct.c:273 #1: 000000007765b856 (sb_writers#4){.+.+}, at: sb_start_write include/linux/fs.h:1569 [inline] #1: 000000007765b856 (sb_writers#4){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 stack backtrace: CPU: 1 PID: 7034 Comm: syz-executor.5 Not tainted 4.19.36 #4 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+0x172/0x1f0 lib/dump_stack.c:113 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1221 check_prev_add kernel/locking/lockdep.c:1861 [inline] check_prevs_add kernel/locking/lockdep.c:1974 [inline] validate_chain kernel/locking/lockdep.c:2415 [inline] __lock_acquire+0x2e6d/0x48f0 kernel/locking/lockdep.c:3411 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 acct_pin_kill+0x27/0x100 kernel/acct.c:173 pin_kill+0x18f/0x860 fs/fs_pin.c:50 acct_on+0x574/0x790 kernel/acct.c:254 __do_sys_acct kernel/acct.c:286 [inline] __se_sys_acct kernel/acct.c:273 [inline] __x64_sys_acct+0xae/0x200 kernel/acct.c:273 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458da9 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd2b7895c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a3 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000458da9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000200 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd2b78966d4 R13: 00000000004becd2 R14: 00000000004cfa50 R15: 00000000ffffffff kobject: 'loop2' (00000000309028b8): kobject_uevent_env Process accounting resumed kobject: 'loop2' (00000000309028b8): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env overlayfs: failed to resolve './file1': -2 kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' Process accounting resumed overlayfs: failed to resolve './file1': -2 kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' Process accounting resumed kobject: 'loop2' (00000000309028b8): kobject_uevent_env kobject: 'loop2' (00000000309028b8): fill_kobj_path: path = '/devices/virtual/block/loop2' Process accounting resumed kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' Process accounting resumed overlayfs: failed to resolve './file1': -2 Process accounting resumed kobject: 'loop2' (00000000309028b8): kobject_uevent_env kobject: 'loop2' (00000000309028b8): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (00000000309028b8): kobject_uevent_env kobject: 'loop2' (00000000309028b8): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop2' (00000000309028b8): kobject_uevent_env kobject: 'loop2' (00000000309028b8): fill_kobj_path: path = '/devices/virtual/block/loop2' Process accounting resumed kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' Process accounting resumed Process accounting resumed audit: type=1804 audit(1556203724.145:520): pid=7364 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.2" name="bus" dev="sda1" ino=17074 res=1 audit: type=1804 audit(1556203724.185:521): pid=7367 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.2" name="bus" dev="sda1" ino=17074 res=1 audit: type=1804 audit(1556203724.365:522): pid=7378 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.2" name="bus" dev="sda1" ino=17291 res=1 audit: type=1804 audit(1556203724.365:523): pid=7380 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.3" name="bus" dev="sda1" ino=17292 res=1 audit: type=1804 audit(1556203724.465:524): pid=7388 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.3" name="bus" dev="sda1" ino=16632 res=1 audit: type=1804 audit(1556203724.465:525): pid=7386 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.1" name="bus" dev="sda1" ino=17298 res=1 audit: type=1804 audit(1556203724.525:526): pid=7393 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.2" name="bus" dev="sda1" ino=17292 res=1 audit: type=1804 audit(1556203724.605:527): pid=7400 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.1" name="bus" dev="sda1" ino=17293 res=1 audit: type=1804 audit(1556203724.635:528): pid=7403 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.3" name="bus" dev="sda1" ino=17288 res=1 audit: type=1804 audit(1556203724.685:529): pid=7409 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.1" name="bus" dev="sda1" ino=17293 res=1 netlink: 6 bytes leftover after parsing attributes in process `syz-executor.1'. device ip6gretap0 entered promiscuous mode netlink: 6 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 6 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 6 bytes leftover after parsing attributes in process `syz-executor.1'. kobject: 'loop4' (000000009c957fb3): kobject_uevent_env kobject: 'loop4' (000000009c957fb3): fill_kobj_path: path = '/devices/virtual/block/loop4' EXT4-fs: Warning: mounting with data=journal disables delayed allocation and O_DIRECT support! EXT4-fs (loop4): encrypted files will use data=ordered instead of data journaling mode EXT4-fs (loop4): Couldn't mount because of unsupported optional features (b2621809) kobject: 'loop4' (000000009c957fb3): kobject_uevent_env kobject: 'loop4' (000000009c957fb3): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop4' (000000009c957fb3): kobject_uevent_env kobject: 'loop4' (000000009c957fb3): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop4' (000000009c957fb3): kobject_uevent_env kobject: 'loop4' (000000009c957fb3): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop4' (000000009c957fb3): kobject_uevent_env kobject: 'loop4' (000000009c957fb3): fill_kobj_path: path = '/devices/virtual/block/loop4' EXT4-fs (loop4): encrypted files will use data=ordered instead of data journaling mode EXT4-fs (loop4): Couldn't mount because of unsupported optional features (b2621809) kobject: 'loop4' (000000009c957fb3): kobject_uevent_env kobject: 'loop4' (000000009c957fb3): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' hfsplus: unable to load nls mapping "none" hfsplus: unable to parse mount options kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (000000009c957fb3): kobject_uevent_env kobject: 'loop4' (000000009c957fb3): fill_kobj_path: path = '/devices/virtual/block/loop4' EXT4-fs (loop4): encrypted files will use data=ordered instead of data journaling mode EXT4-fs (loop4): Couldn't mount because of unsupported optional features (b2621809) kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (000000009c957fb3): kobject_uevent_env kobject: 'loop4' (000000009c957fb3): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' hfsplus: unable to load nls mapping "none" hfsplus: unable to parse mount options kobject: 'loop4' (000000009c957fb3): kobject_uevent_env kobject: 'loop4' (000000009c957fb3): fill_kobj_path: path = '/devices/virtual/block/loop4' EXT4-fs (loop4): encrypted files will use data=ordered instead of data journaling mode EXT4-fs (loop4): Couldn't mount because of unsupported optional features (b2621809) kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (000000009c957fb3): kobject_uevent_env kobject: 'loop4' (000000009c957fb3): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' hfsplus: unable to load nls mapping "none" hfsplus: unable to parse mount options kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop3' (00000000cb1eed0a): kobject_uevent_env kobject: 'loop3' (00000000cb1eed0a): fill_kobj_path: path = '/devices/virtual/block/loop3' hfsplus: unable to load nls mapping "none" hfsplus: unable to parse mount options