overlayfs: failed to resolve './file0': -2 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/6235 is trying to acquire lock: 000000003b3f6c0a (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:77 [inline] 000000003b3f6c0a (&pipe->mutex/1){+.+.}, at: pipe_lock+0x63/0x80 fs/pipe.c:85 but task is already holding lock: 00000000d4899400 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] 00000000d4899400 (sb_writers#3){.+.+}, at: do_splice fs/splice.c:1153 [inline] 00000000d4899400 (sb_writers#3){.+.+}, at: __do_sys_splice fs/splice.c:1428 [inline] 00000000d4899400 (sb_writers#3){.+.+}, at: __se_sys_splice+0x11de/0x16d0 fs/splice.c:1408 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_writers#3){.+.+}: sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_link+0x73/0x2b0 fs/overlayfs/dir.c:676 vfs_link+0x7e6/0xc80 fs/namei.c:4243 do_linkat+0x52a/0x810 fs/namei.c:4311 __do_sys_link fs/namei.c:4340 [inline] __se_sys_link fs/namei.c:4338 [inline] __x64_sys_link+0x5d/0x80 fs/namei.c:4338 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&ovl_i_mutex_key[depth]){+.+.}: inode_lock include/linux/fs.h:748 [inline] ovl_write_iter+0x148/0xb40 fs/overlayfs/file.c:270 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 __kernel_write+0x109/0x370 fs/read_write.c:506 write_pipe_buf+0x153/0x1f0 fs/splice.c:798 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x389/0x800 fs/splice.c:627 splice_from_pipe fs/splice.c:662 [inline] default_file_splice_write+0xd8/0x180 fs/splice.c:810 do_splice_from fs/splice.c:852 [inline] do_splice fs/splice.c:1154 [inline] __do_sys_splice fs/splice.c:1428 [inline] __se_sys_splice+0xfe7/0x16d0 fs/splice.c:1408 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&pipe->mutex/1){+.+.}: __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 pipe_lock_nested fs/pipe.c:77 [inline] pipe_lock+0x63/0x80 fs/pipe.c:85 iter_file_splice_write+0x183/0xbb0 fs/splice.c:700 do_splice_from fs/splice.c:852 [inline] do_splice fs/splice.c:1154 [inline] __do_sys_splice fs/splice.c:1428 [inline] __se_sys_splice+0xfe7/0x16d0 fs/splice.c:1408 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: &pipe->mutex/1 --> &ovl_i_mutex_key[depth] --> sb_writers#3 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_writers#3); lock(&ovl_i_mutex_key[depth]); lock(sb_writers#3); lock(&pipe->mutex/1); *** DEADLOCK *** 1 lock held by syz-executor.3/6235: #0: 00000000d4899400 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 00000000d4899400 (sb_writers#3){.+.+}, at: do_splice fs/splice.c:1153 [inline] #0: 00000000d4899400 (sb_writers#3){.+.+}, at: __do_sys_splice fs/splice.c:1428 [inline] #0: 00000000d4899400 (sb_writers#3){.+.+}, at: __se_sys_splice+0x11de/0x16d0 fs/splice.c:1408 stack backtrace: CPU: 0 PID: 6235 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 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 __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 pipe_lock_nested fs/pipe.c:77 [inline] pipe_lock+0x63/0x80 fs/pipe.c:85 iter_file_splice_write+0x183/0xbb0 fs/splice.c:700 do_splice_from fs/splice.c:852 [inline] do_splice fs/splice.c:1154 [inline] __do_sys_splice fs/splice.c:1428 [inline] __se_sys_splice+0xfe7/0x16d0 fs/splice.c:1408 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f9932cc40c9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9931236168 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f9932de3f80 RCX: 00007f9932cc40c9 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f9932d1fae9 R08: 000000000000fdef R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe89180a4f R14: 00007f9931236300 R15: 0000000000022000 kauditd_printk_skb: 11 callbacks suppressed audit: type=1804 audit(1674384314.323:486): pid=6256 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir145403330/syzkaller.PXvZP8/627/cgroup.controllers" dev="sda1" ino=13940 res=1 batman_adv: Cannot find parent device batman_adv: Cannot find parent device batman_adv: Cannot find parent device batman_adv: Cannot find parent device audit: type=1804 audit(1674384314.753:487): pid=6336 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir886179551/syzkaller.xekmRo/729/bus" dev="sda1" ino=13924 res=1 batman_adv: Cannot find parent device audit: type=1804 audit(1674384315.113:488): pid=6356 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir886179551/syzkaller.xekmRo/729/bus" dev="sda1" ino=13924 res=1 audit: type=1804 audit(1674384315.533:489): pid=6367 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir145403330/syzkaller.PXvZP8/628/cgroup.controllers" dev="sda1" ino=14179 res=1 audit: type=1804 audit(1674384315.603:490): pid=6366 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir1818566159/syzkaller.F9qCPK/920/cgroup.controllers" dev="sda1" ino=14163 res=1 audit: type=1804 audit(1674384315.623:491): pid=6398 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir886179551/syzkaller.xekmRo/730/bus" dev="sda1" ino=13924 res=1 audit: type=1804 audit(1674384315.743:492): pid=6398 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir886179551/syzkaller.xekmRo/730/bus" dev="sda1" ino=13924 res=1 audit: type=1804 audit(1674384315.863:493): pid=6402 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir145403330/syzkaller.PXvZP8/629/cgroup.controllers" dev="sda1" ino=13927 res=1 audit: type=1804 audit(1674384316.063:494): pid=6436 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir886179551/syzkaller.xekmRo/731/bus" dev="sda1" ino=14273 res=1 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. audit: type=1804 audit(1674384316.143:495): pid=6442 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir145403330/syzkaller.PXvZP8/630/bus" dev="sda1" ino=13931 res=1 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. batman_adv: Cannot find parent device batman_adv: Cannot find parent device batman_adv: Cannot find parent device batman_adv: Cannot find parent device kauditd_printk_skb: 15 callbacks suppressed audit: type=1804 audit(1674384319.734:511): pid=6575 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir237190091/syzkaller.WwaNb2/656/bus" dev="sda1" ino=14052 res=1 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. audit: type=1804 audit(1674384320.014:512): pid=6560 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir886179551/syzkaller.xekmRo/733/bus" dev="sda1" ino=14298 res=1 batman_adv: Cannot find parent device batman_adv: Cannot find parent device audit: type=1804 audit(1674384320.154:513): pid=6595 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir145403330/syzkaller.PXvZP8/634/cgroup.controllers" dev="sda1" ino=14385 res=1 audit: type=1804 audit(1674384320.474:514): pid=6603 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir145403330/syzkaller.PXvZP8/635/cgroup.controllers" dev="sda1" ino=14054 res=1 batman_adv: Cannot find parent device batman_adv: Cannot find parent device audit: type=1804 audit(1674384320.694:515): pid=6580 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir237190091/syzkaller.WwaNb2/656/bus" dev="sda1" ino=14052 res=1 audit: type=1804 audit(1674384320.744:516): pid=6588 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir1818566159/syzkaller.F9qCPK/929/cgroup.controllers" dev="sda1" ino=14034 res=1 audit: type=1804 audit(1674384321.584:517): pid=6636 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir1818566159/syzkaller.F9qCPK/930/cgroup.controllers" dev="sda1" ino=14291 res=1 batman_adv: Cannot find parent device batman_adv: Cannot find parent device batman_adv: Cannot find parent device batman_adv: Cannot find parent device audit: type=1804 audit(1674384321.764:518): pid=6662 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir237190091/syzkaller.WwaNb2/657/bus" dev="sda1" ino=14497 res=1 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. batman_adv: Cannot find parent device batman_adv: Cannot find parent device batman_adv: Cannot find parent device batman_adv: Cannot find parent device batman_adv: Cannot find parent device batman_adv: Cannot find parent device batman_adv: Cannot find parent device batman_adv: Cannot find parent device audit: type=1804 audit(1674384322.714:519): pid=6694 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir237190091/syzkaller.WwaNb2/657/bus" dev="sda1" ino=14497 res=1 audit: type=1804 audit(1674384322.844:520): pid=6686 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir1818566159/syzkaller.F9qCPK/931/cgroup.controllers" dev="sda1" ino=14562 res=1 batman_adv: Cannot find parent device batman_adv: Cannot find parent device batman_adv: Cannot find parent device TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. batman_adv: Cannot find parent device batman_adv: Cannot find parent device