netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. ============================================ WARNING: possible recursive locking detected 4.19.211-syzkaller #0 Not tainted -------------------------------------------- syz-executor.3/9954 is trying to acquire lock: 00000000deeae85d (&type->i_mutex_dir_key#11){++++}, at: inode_lock include/linux/fs.h:748 [inline] 00000000deeae85d (&type->i_mutex_dir_key#11){++++}, at: fuse_reverse_inval_entry+0x2e1/0x660 fs/fuse/dir.c:1006 but task is already holding lock: 00000000c6242199 (&type->i_mutex_dir_key#11){++++}, at: inode_lock include/linux/fs.h:748 [inline] 00000000c6242199 (&type->i_mutex_dir_key#11){++++}, 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#11); lock(&type->i_mutex_dir_key#11); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz-executor.3/9954: #0: 0000000095d8cb21 (&fc->killsb){++++}, at: fuse_notify_delete fs/fuse/dev.c:1582 [inline] #0: 0000000095d8cb21 (&fc->killsb){++++}, at: fuse_notify fs/fuse/dev.c:1819 [inline] #0: 0000000095d8cb21 (&fc->killsb){++++}, at: fuse_dev_do_write+0x2343/0x2bc0 fs/fuse/dev.c:1894 #1: 00000000c6242199 (&type->i_mutex_dir_key#11){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 00000000c6242199 (&type->i_mutex_dir_key#11){++++}, at: fuse_reverse_inval_entry+0xaa/0x660 fs/fuse/dir.c:987 stack backtrace: CPU: 1 PID: 9954 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_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: 0033:0x7ff32390e0a9 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:00007ff321e5f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ff323a2e050 RCX: 00007ff32390e0a9 RDX: 000000000000002a RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00007ff323969ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff24deecbf R14: 00007ff321e5f300 R15: 0000000000022000 caif:caif_disconnect_client(): nothing to disconnect kauditd_printk_skb: 28 callbacks suppressed audit: type=1800 audit(1672678471.711:1101): pid=9941 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name=".log" dev="sda1" ino=15171 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. audit: type=1800 audit(1672678472.871:1102): pid=9984 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name=".log" dev="sda1" ino=14051 res=0 caif:caif_disconnect_client(): nothing to disconnect audit: type=1800 audit(1672678473.121:1103): pid=10091 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=14340 res=0 audit: type=1804 audit(1672678473.131:1104): pid=10091 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3490722653/syzkaller.UlKZl5/998/file0" dev="sda1" ino=14340 res=1 audit: type=1800 audit(1672678473.861:1105): pid=10085 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name=".log" dev="sda1" ino=14084 res=0 audit: type=1800 audit(1672678473.891:1106): pid=10157 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=14100 res=0 audit: type=1800 audit(1672678474.561:1107): pid=10169 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="file0" dev="sda1" ino=13912 res=0 caif:caif_disconnect_client(): nothing to disconnect audit: type=1800 audit(1672678474.791:1108): pid=10210 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="file0" dev="sda1" ino=14164 res=0 audit: type=1800 audit(1672678474.801:1109): pid=10222 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=13941 res=0 caif:caif_disconnect_client(): nothing to disconnect audit: type=1800 audit(1672678475.191:1110): pid=10239 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="file0" dev="sda1" ino=14006 res=0 caif:caif_disconnect_client(): nothing to disconnect Started in network mode Own node identity 00000000000000000000000000000001, cluster identity 4711 New replicast peer: fe80:0000:0000:0000:0000:0000:0000:0000 Enabled bearer , priority 10 Disabling bearer netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. New replicast peer: fe80:0000:0000:0000:0000:0000:0000:0000 Enabled bearer , priority 10 Disabling bearer New replicast peer: fe80:0000:0000:0000:0000:0000:0000:0000 Enabled bearer , priority 10 Enabling of bearer rejected, already enabled Disabling bearer netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. New replicast peer: fe80:0000:0000:0000:0000:0000:0000:0000 Enabled bearer , priority 10 Disabling bearer overlayfs: overlapping lowerdir path overlayfs: overlapping lowerdir path overlayfs: 'file0' not a directory audit: type=1804 audit(1672678479.251:1111): pid=10572 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3490722653/syzkaller.UlKZl5/1014/cgroup.controllers" dev="sda1" ino=13944 res=1 audit: type=1804 audit(1672678479.791:1112): pid=10654 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3490722653/syzkaller.UlKZl5/1015/cgroup.controllers" dev="sda1" ino=14021 res=1 audit: type=1804 audit(1672678480.171:1113): pid=10703 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3490722653/syzkaller.UlKZl5/1016/cgroup.controllers" dev="sda1" ino=14056 res=1 audit: type=1804 audit(1672678480.201:1114): pid=10706 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.4" name="/root/syzkaller-testdir3490722653/syzkaller.UlKZl5/1016/cgroup.controllers" dev="sda1" ino=14056 res=1