============================================ WARNING: possible recursive locking detected 4.19.211-syzkaller #0 Not tainted -------------------------------------------- syz-executor.0/28096 is trying to acquire lock: 00000000ab9bb157 (&type->i_mutex_dir_key#10){++++}, at: inode_lock include/linux/fs.h:748 [inline] 00000000ab9bb157 (&type->i_mutex_dir_key#10){++++}, at: fuse_reverse_inval_entry+0x2e1/0x660 fs/fuse/dir.c:1006 but task is already holding lock: 00000000c23d9238 (&type->i_mutex_dir_key#10){++++}, at: inode_lock include/linux/fs.h:748 [inline] 00000000c23d9238 (&type->i_mutex_dir_key#10){++++}, 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#10); lock(&type->i_mutex_dir_key#10); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz-executor.0/28096: #0: 0000000005f4fa9a (&fc->killsb){++++}, at: fuse_notify_delete fs/fuse/dev.c:1582 [inline] #0: 0000000005f4fa9a (&fc->killsb){++++}, at: fuse_notify fs/fuse/dev.c:1819 [inline] #0: 0000000005f4fa9a (&fc->killsb){++++}, at: fuse_dev_do_write+0x2343/0x2bc0 fs/fuse/dev.c:1894 #1: 00000000c23d9238 (&type->i_mutex_dir_key#10){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 00000000c23d9238 (&type->i_mutex_dir_key#10){++++}, at: fuse_reverse_inval_entry+0xaa/0x660 fs/fuse/dir.c:987 stack backtrace: CPU: 1 PID: 28096 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 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: 0033:0x7fc7e2049279 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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:00007fc7e09be168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fc7e215bf80 RCX: 00007fc7e2049279 RDX: 000000000000002c RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007fc7e20a3189 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdb943457f R14: 00007fc7e09be300 R15: 0000000000022000 Cannot find del_set index 0 as target Cannot find del_set index 0 as target Cannot find del_set index 0 as target xt_limit: Overflow, try lower: 0/0 9pnet: Insufficient options for proto=fd FS-Cache: Duplicate cookie detected FS-Cache: O-cookie c=00000000f94aafbf [p=000000002c888f00 fl=222 nc=0 na=1] FS-Cache: O-cookie d=00000000bbdb099e n=00000000d21a9cf7 FS-Cache: O-key=[10] '34323934393933383635' FS-Cache: N-cookie c=0000000068af54e5 [p=000000002c888f00 fl=2 nc=0 na=1] FS-Cache: N-cookie d=00000000bbdb099e n=00000000f77db774 FS-Cache: N-key=[10] '34323934393933383635' netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. IPv6: ADDRCONF(NETDEV_UP): bond4: link is not ready 8021q: adding VLAN 0 to HW filter on device bond4 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. bond0: Error: Device is in use and cannot be enslaved netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. IPv6: ADDRCONF(NETDEV_UP): bond5: link is not ready 8021q: adding VLAN 0 to HW filter on device bond5 bond0: Error: Device is in use and cannot be enslaved netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. IPv6: ADDRCONF(NETDEV_UP): bond6: link is not ready 8021q: adding VLAN 0 to HW filter on device bond6 bond0: Error: Device is in use and cannot be enslaved IPv6: ADDRCONF(NETDEV_UP): bond1: link is not ready 8021q: adding VLAN 0 to HW filter on device bond1 bond0: Error: Device is in use and cannot be enslaved IPv6: ADDRCONF(NETDEV_UP): bond7: link is not ready 8021q: adding VLAN 0 to HW filter on device bond7 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. IPv6: ADDRCONF(NETDEV_UP): bond2: link is not ready 8021q: adding VLAN 0 to HW filter on device bond2 bond0: Error: Device is in use and cannot be enslaved bond0: Error: Device is in use and cannot be enslaved IPVS: ftp: loaded support on port[0] = 21 IPv6: ADDRCONF(NETDEV_UP): bond3: link is not ready 8021q: adding VLAN 0 to HW filter on device bond3 bond0: Error: Device is in use and cannot be enslaved audit: type=1800 audit(1659793941.369:332): pid=28813 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="file0" dev="sda1" ino=13973 res=0 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 audit: type=1800 audit(1659793942.249:333): pid=28884 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="file0" dev="sda1" ino=13954 res=0 audit: type=1800 audit(1659793942.669:334): pid=28901 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=14384 res=0 audit: type=1800 audit(1659793943.149:335): pid=28943 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="file0" dev="sda1" ino=14385 res=0 IPVS: ftp: loaded support on port[0] = 21 dccp_close: ABORT with 200 bytes unread