============================================
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