audit: type=1804 audit(1678168941.578:1544): pid=25735 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir3476050691/syzkaller.dWpv8m/1355/bus/bus" dev="overlay" ino=14149 res=1 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/25733 is trying to acquire lock: 000000007f28314b (&ovl_i_mutex_key[depth]#2){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] 000000007f28314b (&ovl_i_mutex_key[depth]#2){+.+.}, at: ovl_write_iter+0x148/0xb40 fs/overlayfs/file.c:270 but task is already holding lock: 00000000defb8cfc (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:77 [inline] 00000000defb8cfc (&pipe->mutex/1){+.+.}, at: pipe_lock fs/pipe.c:85 [inline] 00000000defb8cfc (&pipe->mutex/1){+.+.}, at: pipe_wait+0x1bd/0x1e0 fs/pipe.c:133 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&pipe->mutex/1){+.+.}: 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 -> #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 do_truncate+0x134/0x1f0 fs/open.c:63 handle_truncate fs/namei.c:3009 [inline] do_last fs/namei.c:3427 [inline] path_openat+0x2308/0x2df0 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_key[depth]#2){+.+.}: down_write+0x34/0x90 kernel/locking/rwsem.c:70 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 other info that might help us debug this: Chain exists of: &ovl_i_mutex_key[depth]#2 --> sb_writers#3 --> &pipe->mutex/1 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&pipe->mutex/1); lock(sb_writers#3); lock(&pipe->mutex/1); lock(&ovl_i_mutex_key[depth]#2); *** DEADLOCK *** 2 locks held by syz-executor.5/25733: #0: 0000000097bfb620 (sb_writers#23){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 0000000097bfb620 (sb_writers#23){.+.+}, at: do_splice fs/splice.c:1153 [inline] #0: 0000000097bfb620 (sb_writers#23){.+.+}, at: __do_sys_splice fs/splice.c:1428 [inline] #0: 0000000097bfb620 (sb_writers#23){.+.+}, at: __se_sys_splice+0x11de/0x16d0 fs/splice.c:1408 #1: 00000000defb8cfc (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:77 [inline] #1: 00000000defb8cfc (&pipe->mutex/1){+.+.}, at: pipe_lock fs/pipe.c:85 [inline] #1: 00000000defb8cfc (&pipe->mutex/1){+.+.}, at: pipe_wait+0x1bd/0x1e0 fs/pipe.c:133 stack backtrace: CPU: 1 PID: 25733 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 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 down_write+0x34/0x90 kernel/locking/rwsem.c:70 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 RIP: 0033:0x7fae266d10f9 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:00007fae24c43168 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007fae267f0f80 RCX: 00007fae266d10f9 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007fae2672cae9 R08: 000000000000fdef R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffff8b98c9f R14: 00007fae24c43300 R15: 0000000000022000 9pnet: Insufficient options for proto=fd netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. 9pnet: Insufficient options for proto=fd device erspan1 entered promiscuous mode 9pnet: Insufficient options for proto=fd audit: type=1804 audit(1678168944.188:1545): pid=25787 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir2559764643/syzkaller.4jVMKL/1660/bus" dev="sda1" ino=14436 res=1 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. audit: type=1800 audit(1678168944.188:1546): pid=25787 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=14436 res=0 9pnet: Insufficient options for proto=fd netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. 9pnet: Insufficient options for proto=fd audit: type=1804 audit(1678168944.778:1547): pid=25771 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir3476050691/syzkaller.dWpv8m/1356/bus" dev="sda1" ino=14468 res=1 audit: type=1804 audit(1678168944.848:1548): pid=25804 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir3476050691/syzkaller.dWpv8m/1356/bus" dev="sda1" ino=14468 res=1 audit: type=1804 audit(1678168944.848:1549): pid=25804 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.5" name="/root/syzkaller-testdir3476050691/syzkaller.dWpv8m/1356/bus" dev="sda1" ino=14468 res=1 9pnet: Insufficient options for proto=fd audit: type=1804 audit(1678168945.228:1550): pid=25776 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir326274215/syzkaller.4mPtfp/425/bus" dev="sda1" ino=13910 res=1 audit: type=1804 audit(1678168945.278:1551): pid=25827 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir326274215/syzkaller.4mPtfp/425/bus" dev="sda1" ino=13910 res=1 audit: type=1804 audit(1678168945.388:1552): pid=25845 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir3476050691/syzkaller.dWpv8m/1357/bus" dev="sda1" ino=14403 res=1 audit: type=1804 audit(1678168945.388:1553): pid=25845 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir3476050691/syzkaller.dWpv8m/1357/bus" dev="sda1" ino=14403 res=1 9pnet: Insufficient options for proto=fd audit: type=1804 audit(1678168945.388:1554): pid=25845 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir3476050691/syzkaller.dWpv8m/1357/bus" dev="sda1" ino=14403 res=1 audit: type=1804 audit(1678168945.388:1555): pid=25845 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir3476050691/syzkaller.dWpv8m/1357/bus" dev="sda1" ino=14403 res=1 audit: type=1804 audit(1678168945.388:1556): pid=25845 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir3476050691/syzkaller.dWpv8m/1357/bus" dev="sda1" ino=14403 res=1 audit: type=1804 audit(1678168945.388:1557): pid=25845 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir3476050691/syzkaller.dWpv8m/1357/bus" dev="sda1" ino=14403 res=1 9pnet: Insufficient options for proto=fd audit: type=1804 audit(1678168945.388:1558): pid=25845 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir3476050691/syzkaller.dWpv8m/1357/bus" dev="sda1" ino=14403 res=1 audit: type=1804 audit(1678168945.388:1559): pid=25845 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir3476050691/syzkaller.dWpv8m/1357/bus" dev="sda1" ino=14403 res=1 audit: type=1804 audit(1678168945.388:1560): pid=25845 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir3476050691/syzkaller.dWpv8m/1357/bus" dev="sda1" ino=14403 res=1 9pnet: Insufficient options for proto=fd audit: type=1804 audit(1678168945.388:1561): pid=25845 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir3476050691/syzkaller.dWpv8m/1357/bus" dev="sda1" ino=14403 res=1 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. 9pnet: Insufficient options for proto=fd netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory 9pnet: Insufficient options for proto=fd overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory 9pnet: Insufficient options for proto=fd overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory 9pnet: Insufficient options for proto=fd overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory 9pnet: Insufficient options for proto=fd overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory overlayfs: './file1' not a directory 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd