IPVS: ftp: loaded support on port[0] = 21 ============================================ WARNING: possible recursive locking detected 4.19.211-syzkaller #0 Not tainted -------------------------------------------- syz-executor.2/21744 is trying to acquire lock: 00000000b324868a (&type->i_mutex_dir_key#9){++++}, at: inode_lock include/linux/fs.h:748 [inline] 00000000b324868a (&type->i_mutex_dir_key#9){++++}, at: fuse_reverse_inval_entry+0x2e1/0x660 fs/fuse/dir.c:1006 but task is already holding lock: 000000005a2ec3e4 (&type->i_mutex_dir_key#9){++++}, at: inode_lock include/linux/fs.h:748 [inline] 000000005a2ec3e4 (&type->i_mutex_dir_key#9){++++}, at: fuse_reverse_inval_entry+0xaa/0x660 fs/fuse/dir.c:987 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&type->i_mutex_dir_key#9); lock(&type->i_mutex_dir_key#9); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz-executor.2/21744: #0: 00000000aa05865a (&fc->killsb){++++}, at: fuse_notify_delete fs/fuse/dev.c:1582 [inline] #0: 00000000aa05865a (&fc->killsb){++++}, at: fuse_notify fs/fuse/dev.c:1819 [inline] #0: 00000000aa05865a (&fc->killsb){++++}, at: fuse_dev_do_write+0x2343/0x2bc0 fs/fuse/dev.c:1894 #1: 000000005a2ec3e4 (&type->i_mutex_dir_key#9){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 000000005a2ec3e4 (&type->i_mutex_dir_key#9){++++}, at: fuse_reverse_inval_entry+0xaa/0x660 fs/fuse/dir.c:987 stack backtrace: CPU: 0 PID: 21744 Comm: syz-executor.2 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_deadlock_bug kernel/locking/lockdep.c:1764 [inline] check_deadlock kernel/locking/lockdep.c:1808 [inline] validate_chain kernel/locking/lockdep.c:2404 [inline] __lock_acquire.cold+0x121/0x57e 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] fuse_reverse_inval_entry+0x2e1/0x660 fs/fuse/dir.c:1006 fuse_notify_delete fs/fuse/dev.c:1585 [inline] fuse_notify fs/fuse/dev.c:1819 [inline] fuse_dev_do_write+0x239e/0x2bc0 fs/fuse/dev.c:1894 fuse_dev_write+0x153/0x1e0 fs/fuse/dev.c:1978 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 RIP: 0033:0x7f03f33e00a9 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:00007f03f1931168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f03f3500050 RCX: 00007f03f33e00a9 RDX: 000000000000002a RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00007f03f343bae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff240ffb6f R14: 00007f03f1931300 R15: 0000000000022000 XFS (loop1): Mounting V4 Filesystem XFS (loop1): Ending clean mount audit: type=1800 audit(1672434043.678:1482): pid=21731 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="loop1" ino=41 res=0 syz-executor.1 (21731) used greatest stack depth: 21736 bytes left XFS (loop1): Unmounting Filesystem XFS (loop4): Mounting V4 Filesystem XFS (loop4): Ending clean mount XFS (loop3): Mounting V4 Filesystem XFS (loop3): Ending clean mount XFS (loop0): Mounting V4 Filesystem XFS (loop0): Ending clean mount audit: type=1800 audit(1672434044.798:1483): pid=21840 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="loop4" ino=41 res=0 XFS (loop1): Mounting V4 Filesystem XFS (loop1): Ending clean mount audit: type=1800 audit(1672434044.808:1484): pid=21848 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="loop3" ino=41 res=0 audit: type=1800 audit(1672434044.888:1485): pid=21845 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="loop0" ino=41 res=0 XFS (loop4): Unmounting Filesystem audit: type=1800 audit(1672434045.038:1486): pid=21854 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="loop1" ino=41 res=0 XFS (loop0): Unmounting Filesystem XFS (loop3): Unmounting Filesystem syz-executor.1 (21854) used greatest stack depth: 21488 bytes left XFS (loop1): Unmounting Filesystem XFS (loop4): Mounting V4 Filesystem XFS (loop4): Ending clean mount audit: type=1800 audit(1672434046.218:1487): pid=21941 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="loop4" ino=41 res=0 XFS (loop3): Mounting V4 Filesystem XFS (loop0): Mounting V4 Filesystem XFS (loop3): Ending clean mount XFS (loop0): Ending clean mount audit: type=1800 audit(1672434046.348:1488): pid=21945 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="loop3" ino=41 res=0 XFS (loop4): Unmounting Filesystem audit: type=1800 audit(1672434046.418:1489): pid=21947 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="loop0" ino=41 res=0 XFS (loop2): Mounting V4 Filesystem XFS (loop3): Unmounting Filesystem XFS (loop2): Ending clean mount XFS (loop0): Unmounting Filesystem XFS (loop1): Mounting V4 Filesystem audit: type=1800 audit(1672434046.648:1490): pid=21958 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="loop2" ino=41 res=0 XFS (loop1): Ending clean mount audit: type=1800 audit(1672434046.798:1491): pid=21959 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="loop1" ino=41 res=0 XFS (loop2): Unmounting Filesystem XFS (loop1): Unmounting Filesystem XFS (loop3): Mounting V4 Filesystem XFS (loop4): Mounting V4 Filesystem XFS (loop3): Ending clean mount XFS (loop4): Ending clean mount audit: type=1800 audit(1672434047.598:1492): pid=22039 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="loop3" ino=41 res=0 audit: type=1800 audit(1672434047.648:1493): pid=22040 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="loop4" ino=41 res=0 XFS (loop3): Unmounting Filesystem XFS (loop4): Unmounting Filesystem XFS (loop0): Mounting V4 Filesystem XFS (loop0): Ending clean mount audit: type=1800 audit(1672434048.088:1494): pid=22044 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="loop0" ino=41 res=0 XFS (loop2): Mounting V4 Filesystem XFS (loop1): Mounting V4 Filesystem XFS (loop2): Ending clean mount XFS (loop1): Ending clean mount audit: type=1800 audit(1672434048.258:1495): pid=22061 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="loop2" ino=41 res=0 XFS (loop0): Unmounting Filesystem audit: type=1800 audit(1672434048.328:1496): pid=22066 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="loop1" ino=41 res=0 XFS (loop1): Unmounting Filesystem XFS (loop2): Unmounting Filesystem XFS (loop2): Mounting V4 Filesystem XFS (loop2): Ending clean mount XFS (loop2): Unmounting Filesystem