====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/16601 is trying to acquire lock: 000000000fc164b9 (&ovl_i_mutex_key[depth]){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] 000000000fc164b9 (&ovl_i_mutex_key[depth]){+.+.}, at: ovl_write_iter+0x148/0xb40 fs/overlayfs/file.c:270 but task is already holding lock: 00000000b37e6be3 (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:77 [inline] 00000000b37e6be3 (&pipe->mutex/1){+.+.}, at: pipe_lock fs/pipe.c:85 [inline] 00000000b37e6be3 (&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.5/16601: #0: 0000000089217d0d (sb_writers#22){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 0000000089217d0d (sb_writers#22){.+.+}, at: do_splice fs/splice.c:1153 [inline] #0: 0000000089217d0d (sb_writers#22){.+.+}, at: __do_sys_splice fs/splice.c:1428 [inline] #0: 0000000089217d0d (sb_writers#22){.+.+}, at: __se_sys_splice+0x11de/0x16d0 fs/splice.c:1408 #1: 00000000b37e6be3 (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:77 [inline] #1: 00000000b37e6be3 (&pipe->mutex/1){+.+.}, at: pipe_lock fs/pipe.c:85 [inline] #1: 00000000b37e6be3 (&pipe->mutex/1){+.+.}, at: pipe_wait+0x1bd/0x1e0 fs/pipe.c:133 stack backtrace: CPU: 1 PID: 16601 Comm: syz-executor.5 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: 0033:0x7fd16efcf0d9 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:00007fd16d541168 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007fd16f0eef80 RCX: 00007fd16efcf0d9 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007fd16f02aae9 R08: 000000000000fdef R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffecd2b9cff R14: 00007fd16d541300 R15: 0000000000022000 F2FS-fs (loop2): Invalid log sectors per block(2411855875) log sectorsize(9) F2FS-fs (loop2): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop2): invalid crc value F2FS-fs (loop2): Found nat_bits in checkpoint F2FS-fs (loop2): Mounted with checkpoint version = 753bd00b dccp_close: ABORT with 3 bytes unread dccp_close: ABORT with 3 bytes unread F2FS-fs (loop2): Invalid log sectors per block(2411855875) log sectorsize(9) F2FS-fs (loop2): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop2): invalid crc value F2FS-fs (loop2): Found nat_bits in checkpoint F2FS-fs (loop5): Invalid log sectors per block(2411855875) log sectorsize(9) audit: type=1804 audit(1671106523.864:81): pid=16738 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir256452932/syzkaller.2HMw9z/208/bus" dev="sda1" ino=14082 res=1 audit: type=1800 audit(1671106523.894:82): pid=16738 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14082 res=0 audit: type=1804 audit(1671106523.954:83): pid=16741 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir256452932/syzkaller.2HMw9z/208/bus" dev="sda1" ino=14082 res=1 audit: type=1804 audit(1671106524.034:84): pid=16743 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir256452932/syzkaller.2HMw9z/208/bus" dev="sda1" ino=14082 res=1 audit: type=1804 audit(1671106524.144:85): pid=16748 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir256452932/syzkaller.2HMw9z/209/bus" dev="sda1" ino=14082 res=1 audit: type=1800 audit(1671106524.144:86): pid=16748 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14082 res=0 audit: type=1804 audit(1671106524.194:87): pid=16752 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir256452932/syzkaller.2HMw9z/209/bus" dev="sda1" ino=14082 res=1 audit: type=1804 audit(1671106524.254:88): pid=16755 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir256452932/syzkaller.2HMw9z/209/bus" dev="sda1" ino=14082 res=1 audit: type=1804 audit(1671106524.505:89): pid=16757 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir256452932/syzkaller.2HMw9z/210/bus" dev="sda1" ino=14082 res=1 audit: type=1800 audit(1671106524.505:90): pid=16757 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14082 res=0 f2fs_msg: 25 callbacks suppressed F2FS-fs (loop5): Invalid log sectors per block(2411855875) log sectorsize(9) F2FS-fs (loop5): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop5): invalid crc value F2FS-fs (loop5): Found nat_bits in checkpoint F2FS-fs (loop2): Invalid log sectors per block(2411855875) log sectorsize(9) F2FS-fs (loop2): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop2): invalid crc value F2FS-fs (loop2): Found nat_bits in checkpoint F2FS-fs (loop5): Mounted with checkpoint version = 753bd00b F2FS-fs (loop2): Mounted with checkpoint version = 753bd00b ieee80211 ©,í…×: Selected rate control algorithm 'minstrel_ht' pit: kvm: requested 31009 ns i8254 timer period limited to 200000 ns kvm: pic: non byte read kvm: pic: non byte read kvm: pic: non byte read ieee80211 ©,í…×: Selected rate control algorithm 'minstrel_ht' kvm: pic: non byte read kvm: pic: non byte read kvm: pic: non byte read kvm: pic: non byte read kvm: pic: non byte read kvm: pic: single mode not supported kvm: pic: level sensitive irq not supported kvm: pic: non byte read kvm: pic: non byte read ieee80211 ©,í…×: Selected rate control algorithm 'minstrel_ht' kauditd_printk_skb: 45 callbacks suppressed audit: type=1800 audit(1671106529.085:136): pid=16986 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="file0" dev="sda1" ino=14481 res=0 pit: kvm: requested 31009 ns i8254 timer period limited to 200000 ns kvm: pic: single mode not supported kvm: pic: level sensitive irq not supported audit: type=1800 audit(1671106529.185:137): pid=17002 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="file0" dev="sda1" ino=14481 res=0 pit: kvm: requested 31009 ns i8254 timer period limited to 200000 ns kvm: pic: single mode not supported kvm: pic: level sensitive irq not supported audit: type=1800 audit(1671106529.405:138): pid=17027 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="file0" dev="sda1" ino=14825 res=0 ieee80211 ©,í…×: Selected rate control algorithm 'minstrel_ht' pit: kvm: requested 31009 ns i8254 timer period limited to 200000 ns ieee80211 phy18: Selected rate control algorithm 'minstrel_ht' kvm: pic: single mode not supported