====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/17224 is trying to acquire lock: 0000000070352c4a (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:77 [inline] 0000000070352c4a (&pipe->mutex/1){+.+.}, at: pipe_lock+0x63/0x80 fs/pipe.c:85 but task is already holding lock: 0000000091948618 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] 0000000091948618 (sb_writers#3){.+.+}, at: do_splice fs/splice.c:1153 [inline] 0000000091948618 (sb_writers#3){.+.+}, at: __do_sys_splice fs/splice.c:1428 [inline] 0000000091948618 (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){.+.+}: file_start_write include/linux/fs.h:2779 [inline] ovl_write_iter+0x932/0xb40 fs/overlayfs/file.c:282 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 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 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.1/17224: #0: 0000000091948618 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 0000000091948618 (sb_writers#3){.+.+}, at: do_splice fs/splice.c:1153 [inline] #0: 0000000091948618 (sb_writers#3){.+.+}, at: __do_sys_splice fs/splice.c:1428 [inline] #0: 0000000091948618 (sb_writers#3){.+.+}, at: __se_sys_splice+0x11de/0x16d0 fs/splice.c:1408 stack backtrace: CPU: 0 PID: 17224 Comm: syz-executor.1 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 __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: 0033:0x7f239064c0d9 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:00007f238ebbe168 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f239076bf80 RCX: 00007f239064c0d9 RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f23906a7ae9 R08: 0000000000000004 R09: 0000000000000003 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd2f73d1af R14: 00007f238ebbe300 R15: 0000000000022000 netlink: 'syz-executor.3': attribute type 3 has an invalid length. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. audit: type=1804 audit(1669404044.031:758): pid=17250 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir1007770922/syzkaller.2hSVIZ/885/cgroup.controllers" dev="sda1" ino=14438 res=1 netlink: zone id is out of range audit: type=1804 audit(1669404044.781:759): pid=17282 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir1007770922/syzkaller.2hSVIZ/886/cgroup.controllers" dev="sda1" ino=14233 res=1 netlink: zone id is out of range audit: type=1804 audit(1669404044.831:760): pid=17281 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir834716246/syzkaller.fLovdu/1222/cgroup.controllers" dev="sda1" ino=14199 res=1 audit: type=1804 audit(1669404044.851:761): pid=17296 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.4" name="/root/syzkaller-testdir1007770922/syzkaller.2hSVIZ/886/cgroup.controllers" dev="sda1" ino=14233 res=1 audit: type=1804 audit(1669404044.851:762): pid=17282 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir1007770922/syzkaller.2hSVIZ/886/cgroup.controllers" dev="sda1" ino=14233 res=1 audit: type=1804 audit(1669404045.201:763): pid=17336 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir834716246/syzkaller.fLovdu/1223/cgroup.controllers" dev="sda1" ino=14199 res=1 netlink: zone id is out of range audit: type=1804 audit(1669404045.661:764): pid=17349 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir834716246/syzkaller.fLovdu/1224/cgroup.controllers" dev="sda1" ino=14723 res=1 netlink: zone id is out of range netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. audit: type=1804 audit(1669404045.901:765): pid=17384 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir834716246/syzkaller.fLovdu/1225/cgroup.controllers" dev="sda1" ino=14518 res=1 netlink: zone id is out of range netlink: 16 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 'syz-executor.3': attribute type 1 has an invalid length. audit: type=1804 audit(1669404046.501:766): pid=17404 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir834716246/syzkaller.fLovdu/1226/cgroup.controllers" dev="sda1" ino=14089 res=1 netlink: zone id is out of range netlink: 16 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 'syz-executor.3': attribute type 1 has an invalid length. audit: type=1804 audit(1669404046.811:767): pid=17417 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir834716246/syzkaller.fLovdu/1227/cgroup.controllers" dev="sda1" ino=14899 res=1 netlink: zone id is out of range netlink: zone id is out of range netlink: 'syz-executor.3': attribute type 1 has an invalid length. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.5'. audit: type=1804 audit(1669404046.861:768): pid=17418 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir1106706197/syzkaller.ThaWe2/168/cgroup.controllers" dev="sda1" ino=14089 res=1 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 'syz-executor.3': attribute type 1 has an invalid length. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 'syz-executor.3': attribute type 1 has an invalid length. audit: type=1804 audit(1669404047.341:769): pid=17460 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir834716246/syzkaller.fLovdu/1228/cgroup.controllers" dev="sda1" ino=14915 res=1 netlink: zone id is out of range netlink: 16 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: zone id is out of range audit: type=1804 audit(1669404047.401:770): pid=17465 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir1106706197/syzkaller.ThaWe2/169/cgroup.controllers" dev="sda1" ino=14994 res=1 netlink: 'syz-executor.3': attribute type 1 has an invalid length. netlink: 'syz-executor.3': attribute type 1 has an invalid length. audit: type=1804 audit(1669404047.761:771): pid=17494 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir834716246/syzkaller.fLovdu/1229/cgroup.controllers" dev="sda1" ino=14964 res=1 audit: type=1804 audit(1669404047.841:772): pid=17496 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir1106706197/syzkaller.ThaWe2/170/cgroup.controllers" dev="sda1" ino=14979 res=1 audit: type=1804 audit(1669404048.081:773): pid=17526 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir834716246/syzkaller.fLovdu/1230/cgroup.controllers" dev="sda1" ino=15090 res=1 net_ratelimit: 1 callbacks suppressed netlink: zone id is out of range netlink: zone id is out of range netlink: zone id is out of range netlink: zone id is out of range netlink: zone id is out of range kauditd_printk_skb: 15 callbacks suppressed audit: type=1804 audit(1669404050.782:789): pid=17840 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir1106706197/syzkaller.ThaWe2/182/cgroup.controllers" dev="sda1" ino=14374 res=1 netlink: zone id is out of range audit: type=1804 audit(1669404051.432:790): pid=17857 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir834716246/syzkaller.fLovdu/1241/cgroup.controllers" dev="sda1" ino=14152 res=1 nla_parse: 27 callbacks suppressed netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 'syz-executor.3': attribute type 2 has an invalid length. ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 audit: type=1804 audit(1669404052.332:791): pid=17880 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir1106706197/syzkaller.ThaWe2/183/cgroup.controllers" dev="sda1" ino=15357 res=1 audit: type=1800 audit(1669404052.612:792): pid=17894 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="cgroup.controllers" dev="sda1" ino=15283 res=0 netlink: 'syz-executor.3': attribute type 2 has an invalid length. netlink: 'syz-executor.3': attribute type 2 has an invalid length.