====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/9825 is trying to acquire lock: 000000003fcfb6b2 (&ovl_i_mutex_key[depth]){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] 000000003fcfb6b2 (&ovl_i_mutex_key[depth]){+.+.}, at: ovl_write_iter+0x148/0xb40 fs/overlayfs/file.c:270 but task is already holding lock: 000000007ed03387 (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:77 [inline] 000000007ed03387 (&pipe->mutex/1){+.+.}, at: pipe_lock fs/pipe.c:85 [inline] 000000007ed03387 (&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]){+.+.}: 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] --> 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]); *** DEADLOCK *** 2 locks held by syz-executor.3/9825: #0: 00000000b0488095 (sb_writers#15){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 00000000b0488095 (sb_writers#15){.+.+}, at: do_splice fs/splice.c:1153 [inline] #0: 00000000b0488095 (sb_writers#15){.+.+}, at: __do_sys_splice fs/splice.c:1428 [inline] #0: 00000000b0488095 (sb_writers#15){.+.+}, at: __se_sys_splice+0x11de/0x16d0 fs/splice.c:1408 #1: 000000007ed03387 (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:77 [inline] #1: 000000007ed03387 (&pipe->mutex/1){+.+.}, at: pipe_lock fs/pipe.c:85 [inline] #1: 000000007ed03387 (&pipe->mutex/1){+.+.}, at: pipe_wait+0x1bd/0x1e0 fs/pipe.c:133 stack backtrace: CPU: 0 PID: 9825 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 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: 0033:0x7f2a7b70b0d9 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:00007f2a79c7d168 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f2a7b82af80 RCX: 00007f2a7b70b0d9 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f2a7b766ae9 R08: 0000000000000006 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd76215ebf R14: 00007f2a79c7d300 R15: 0000000000022000 audit: type=1107 audit(1670888158.284:4): pid=9853 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='Œ' IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 audit: type=1804 audit(1670888158.654:5): pid=9891 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir3760551238/syzkaller.VtFkgr/10/file0" dev="sda1" ino=13886 res=1 IPVS: ftp: loaded support on port[0] = 21 x_tables: duplicate underflow at hook 2 audit: type=1804 audit(1670888159.114:6): pid=9959 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir3760551238/syzkaller.VtFkgr/11/file0" dev="sda1" ino=13879 res=1 IPVS: ftp: loaded support on port[0] = 21 audit: type=1804 audit(1670888159.354:7): pid=10017 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir3760551238/syzkaller.VtFkgr/12/file0" dev="sda1" ino=13955 res=1 audit: type=1804 audit(1670888159.414:8): pid=9966 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir526128773/syzkaller.wu0r3K/15/file0" dev="sda1" ino=13930 res=1 audit: type=1804 audit(1670888160.494:9): pid=10065 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir3760551238/syzkaller.VtFkgr/13/file0" dev="sda1" ino=13975 res=1 audit: type=1804 audit(1670888160.544:10): pid=10070 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir526128773/syzkaller.wu0r3K/16/file0" dev="sda1" ino=13976 res=1 audit: type=1804 audit(1670888160.884:11): pid=10110 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir526128773/syzkaller.wu0r3K/17/file0" dev="sda1" ino=13894 res=1 x_tables: duplicate underflow at hook 2 x_tables: duplicate underflow at hook 2 capability: warning: `syz-executor.2' uses 32-bit capabilities (legacy support in use) netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. x_tables: ip6_tables: policy.0 match: invalid size 312 (kernel) != (user) 0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. x_tables: ip6_tables: policy.0 match: invalid size 312 (kernel) != (user) 0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. x_tables: ip6_tables: policy.0 match: invalid size 312 (kernel) != (user) 0 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. x_tables: ip6_tables: policy.0 match: invalid size 312 (kernel) != (user) 0 x_tables: ip6_tables: policy.0 match: invalid size 312 (kernel) != (user) 0 audit: type=1326 audit(1670888165.854:12): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=10986 comm="syz-executor.3" exe="/root/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f2a7b70b0d9 code=0x0 x_tables: ip6_tables: policy.0 match: invalid size 312 (kernel) != (user) 0 x_tables: ip6_tables: policy.0 match: invalid size 312 (kernel) != (user) 0 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 audit: type=1326 audit(1670888166.774:13): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=11229 comm="syz-executor.4" exe="/root/syz-executor.4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fca9f1ad0d9 code=0x0 IPVS: ftp: loaded support on port[0] = 21