============================================ WARNING: possible recursive locking detected 4.19.211-syzkaller #0 Not tainted -------------------------------------------- syz-executor.4/23460 is trying to acquire lock: 0000000076167f69 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] 0000000076167f69 (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0x2e1/0x660 fs/fuse/dir.c:1006 but task is already holding lock: 000000008dc11aa7 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] 000000008dc11aa7 (&type->i_mutex_dir_key#8){++++}, 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#8); lock(&type->i_mutex_dir_key#8); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz-executor.4/23460: #0: 00000000a8aeda13 (&fc->killsb){++++}, at: fuse_notify_delete fs/fuse/dev.c:1582 [inline] #0: 00000000a8aeda13 (&fc->killsb){++++}, at: fuse_notify fs/fuse/dev.c:1819 [inline] #0: 00000000a8aeda13 (&fc->killsb){++++}, at: fuse_dev_do_write+0x2343/0x2bc0 fs/fuse/dev.c:1894 #1: 000000008dc11aa7 (&type->i_mutex_dir_key#8){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 000000008dc11aa7 (&type->i_mutex_dir_key#8){++++}, at: fuse_reverse_inval_entry+0xaa/0x660 fs/fuse/dir.c:987 stack backtrace: CPU: 0 PID: 23460 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 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: 0033:0x7fea6c7c95a9 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:00007fea6ad3c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fea6c8e9f80 RCX: 00007fea6c7c95a9 RDX: 000000000000002c RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007fea6c8247b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd68a138af R14: 00007fea6ad3c300 R15: 0000000000022000 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 PF_BRIDGE: br_mdb_parse() with invalid entry kvm [23604]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x0 IPVS: ftp: loaded support on port[0] = 21 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. IPVS: ftp: loaded support on port[0] = 21 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'. ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 audit: type=1804 audit(1666746748.061:90): pid=23744 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir2406667715/syzkaller.Fv3LOL/637/bus" dev="sda1" ino=14626 res=1 9pnet: Insufficient options for proto=fd IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 overlayfs: failed to clone lowerpath overlayfs: failed to clone upperpath audit: type=1326 audit(1666746749.971:91): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=23955 comm="syz-executor.0" exe="/root/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7ff6576935a9 code=0x0 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. IPv6: RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE IPv6: NLM_F_CREATE should be set when creating new route IPv6: NLM_F_CREATE should be set when creating new route IPv6: RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. IPv6: RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE audit: type=1800 audit(1666746752.691:92): pid=24168 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="file0" dev="sda1" ino=15175 res=0 IPv6: RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE audit: type=1800 audit(1666746752.781:93): pid=24182 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="file0" dev="sda1" ino=15181 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. device dummy0 entered promiscuous mode audit: type=1800 audit(1666746752.921:94): pid=24202 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="file0" dev="sda1" ino=15175 res=0 team0: Device macvtap1 failed to register rx_handler device dummy0 left promiscuous mode audit: type=1800 audit(1666746753.061:95): pid=24218 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="file0" dev="sda1" ino=15180 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. device dummy0 entered promiscuous mode team0: Device macvtap1 failed to register rx_handler device dummy0 left promiscuous mode device dummy0 entered promiscuous mode team0: Device macvtap1 failed to register rx_handler device dummy0 left promiscuous mode netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. IPVS: ftp: loaded support on port[0] = 21 device dummy0 entered promiscuous mode team0: Device macvtap1 failed to register rx_handler device dummy0 left promiscuous mode audit: type=1800 audit(1666746754.102:96): pid=24346 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="file0" dev="sda1" ino=15197 res=0 audit: type=1804 audit(1666746754.122:97): pid=24346 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="file0" dev="sda1" ino=15197 res=1 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'. device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state bridge4: port 1(bridge_slave_1) entered blocking state bridge4: port 1(bridge_slave_1) entered disabled state device bridge_slave_1 entered promiscuous mode netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'. device bridge_slave_1 left promiscuous mode bridge4: port 1(bridge_slave_1) entered disabled state bridge5: port 1(bridge_slave_1) entered blocking state bridge5: port 1(bridge_slave_1) entered disabled state device bridge_slave_1 entered promiscuous mode netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'. device bridge_slave_1 left promiscuous mode bridge5: port 1(bridge_slave_1) entered disabled state bridge6: port 1(bridge_slave_1) entered blocking state bridge6: port 1(bridge_slave_1) entered disabled state device bridge_slave_1 entered promiscuous mode netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. device bridge_slave_1 left promiscuous mode bridge6: port 1(bridge_slave_1) entered disabled state bridge7: port 1(bridge_slave_1) entered blocking state bridge7: port 1(bridge_slave_1) entered disabled state device bridge_slave_1 entered promiscuous mode IPVS: ftp: loaded support on port[0] = 21