netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. ====================================================== WARNING: possible circular locking dependency detected 4.14.277-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/11587 is trying to acquire lock: (&xt[i].mutex){+.+.}, at: [] xt_find_target+0x3e/0x1e0 net/netfilter/x_tables.c:232 but task is already holding lock: (rtnl_mutex){+.+.}, at: [] rtnl_lock net/core/rtnetlink.c:72 [inline] (rtnl_mutex){+.+.}, at: [] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (rtnl_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 unregister_netdevice_notifier+0x5e/0x2b0 net/core/dev.c:1630 tee_tg_destroy+0x5c/0xb0 net/netfilter/xt_TEE.c:123 cleanup_entry+0x1fd/0x2d0 net/ipv4/netfilter/ip_tables.c:666 __do_replace+0x38d/0x570 net/ipv4/netfilter/ip_tables.c:1086 do_replace net/ipv4/netfilter/ip_tables.c:1142 [inline] do_ipt_set_ctl+0x256/0x3a0 net/ipv4/netfilter/ip_tables.c:1676 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x5f/0xb0 net/netfilter/nf_sockopt.c:115 ip_setsockopt net/ipv4/ip_sockglue.c:1255 [inline] ip_setsockopt+0x94/0xb0 net/ipv4/ip_sockglue.c:1240 tcp_setsockopt+0x7b/0xc0 net/ipv4/tcp.c:2830 SYSC_setsockopt net/socket.c:1865 [inline] SyS_setsockopt+0x110/0x1e0 net/socket.c:1844 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&xt[i].mutex){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 xt_find_target+0x3e/0x1e0 net/netfilter/x_tables.c:232 xt_request_find_target net/netfilter/x_tables.c:261 [inline] xt_request_find_target+0x72/0xe0 net/netfilter/x_tables.c:254 ipt_init_target+0xb9/0x250 net/sched/act_ipt.c:45 __tcf_ipt_init+0x48d/0xc00 net/sched/act_ipt.c:168 tcf_xt_init+0x43/0x50 net/sched/act_ipt.c:210 tcf_action_init_1+0x51a/0x9e0 net/sched/act_api.c:691 tcf_action_init+0x26d/0x400 net/sched/act_api.c:760 tcf_action_add net/sched/act_api.c:1088 [inline] tc_ctl_action+0x2e3/0x510 net/sched/act_api.c:1140 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4322 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2455 netlink_unicast_kernel net/netlink/af_netlink.c:1296 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1322 netlink_sendmsg+0x648/0xbc0 net/netlink/af_netlink.c:1893 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 sock_no_sendpage+0xe2/0x110 net/core/sock.c:2610 kernel_sendpage net/socket.c:3407 [inline] sock_sendpage+0xdf/0x140 net/socket.c:871 pipe_to_sendpage+0x226/0x2d0 fs/splice.c:451 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x326/0x7a0 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] generic_splice_sendpage+0xc1/0x110 fs/splice.c:832 do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0xd59/0x1380 fs/splice.c:1382 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rtnl_mutex); lock(&xt[i].mutex); lock(rtnl_mutex); lock(&xt[i].mutex); *** DEADLOCK *** 2 locks held by syz-executor.2/11587: #0: (&pipe->mutex/1){+.+.}, at: [] pipe_lock_nested fs/pipe.c:82 [inline] #0: (&pipe->mutex/1){+.+.}, at: [] pipe_lock+0x58/0x70 fs/pipe.c:90 #1: (rtnl_mutex){+.+.}, at: [] rtnl_lock net/core/rtnetlink.c:72 [inline] #1: (rtnl_mutex){+.+.}, at: [] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317 stack backtrace: CPU: 1 PID: 11587 Comm: syz-executor.2 Not tainted 4.14.277-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 xt_find_target+0x3e/0x1e0 net/netfilter/x_tables.c:232 xt_request_find_target net/netfilter/x_tables.c:261 [inline] xt_request_find_target+0x72/0xe0 net/netfilter/x_tables.c:254 ipt_init_target+0xb9/0x250 net/sched/act_ipt.c:45 __tcf_ipt_init+0x48d/0xc00 net/sched/act_ipt.c:168 tcf_xt_init+0x43/0x50 net/sched/act_ipt.c:210 tcf_action_init_1+0x51a/0x9e0 net/sched/act_api.c:691 tcf_action_init+0x26d/0x400 net/sched/act_api.c:760 tcf_action_add net/sched/act_api.c:1088 [inline] tc_ctl_action+0x2e3/0x510 net/sched/act_api.c:1140 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4322 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2455 netlink_unicast_kernel net/netlink/af_netlink.c:1296 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1322 netlink_sendmsg+0x648/0xbc0 net/netlink/af_netlink.c:1893 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 sock_no_sendpage+0xe2/0x110 net/core/sock.c:2610 kernel_sendpage net/socket.c:3407 [inline] sock_sendpage+0xdf/0x140 net/socket.c:871 pipe_to_sendpage+0x226/0x2d0 fs/splice.c:451 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x326/0x7a0 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] generic_splice_sendpage+0xc1/0x110 fs/splice.c:832 do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0xd59/0x1380 fs/splice.c:1382 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fb022abd0e9 RSP: 002b:00007fb021411168 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007fb022bd0030 RCX: 00007fb022abd0e9 RDX: 0000000000000016 RSI: 0000000000000000 RDI: 0000000000000011 RBP: 00007fb022b1708d R08: 000000000004ffe0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdccb8fa2f R14: 00007fb021411300 R15: 0000000000022000 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. IPVS: ftp: loaded support on port[0] = 21 kvm: vcpu 0: requested 128 ns lapic timer period limited to 500000 ns syz-executor.4 (11782): drop_caches: 1 syz-executor.4 (11782): drop_caches: 1 kvm: vcpu 0: requested 128 ns lapic timer period limited to 500000 ns kvm: vcpu 0: requested 128 ns lapic timer period limited to 500000 ns syz-executor.4 (11877): drop_caches: 1 syz-executor.0 (11896): drop_caches: 1 syz-executor.4 (11877): drop_caches: 1 syz-executor.0 (11896): drop_caches: 1 kvm: vcpu 0: requested 128 ns lapic timer period limited to 500000 ns kvm: vcpu 0: requested 128 ns lapic timer period limited to 500000 ns kvm: vcpu 0: requested 128 ns lapic timer period limited to 500000 ns EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue overlayfs: fs on '.' does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "xino=off" or missing value devpts: called with bogus options EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue syz-executor.0 (11923): drop_caches: 1 syz-executor.4 (11922): drop_caches: 1 syz-executor.5 (11916): drop_caches: 1 EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue syz-executor.4 (11922): drop_caches: 1 overlayfs: fs on '.' does not support file handles, falling back to index=off. syz-executor.0 (11923): drop_caches: 1 syz-executor.5 (11916): drop_caches: 1 overlayfs: unrecognized mount option "xino=off" or missing value devpts: called with bogus options EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue kvm: vcpu 0: requested 128 ns lapic timer period limited to 500000 ns EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue kvm: vcpu 0: requested 128 ns lapic timer period limited to 500000 ns kvm: vcpu 0: requested 128 ns lapic timer period limited to 500000 ns overlayfs: unrecognized mount option "xino=off" or missing value devpts: called with bogus options syz-executor.5 (12016): drop_caches: 1 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue syz-executor.0 (12007): drop_caches: 1 syz-executor.4 (12014): drop_caches: 1 syz-executor.5 (12016): drop_caches: 1 EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue overlayfs: fs on '.' does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "xino=off" or missing value syz-executor.0 (12007): drop_caches: 1 devpts: called with bogus options syz-executor.4 (12014): drop_caches: 1 EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue kvm: vcpu 0: requested 128 ns lapic timer period limited to 500000 ns EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue overlayfs: fs on '.' does not support file handles, falling back to index=off. overlayfs: fs on '.' does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "xino=off" or missing value overlayfs: unrecognized mount option "xino=off" or missing value EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue devpts: called with bogus options devpts: called with bogus options syz-executor.5 (12068): drop_caches: 1 overlayfs: fs on '.' does not support file handles, falling back to index=off. syz-executor.5 (12068): drop_caches: 1 overlayfs: unrecognized mount option "xino=off" or missing value EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue devpts: called with bogus options EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue overlayfs: fs on '.' does not support file handles, falling back to index=off. overlayfs: fs on '.' does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "xino=off" or missing value overlayfs: unrecognized mount option "xino=off" or missing value overlayfs: fs on '.' does not support file handles, falling back to index=off. overlayfs: fs on '.' does not support file handles, falling back to index=off. devpts: called with bogus options EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue overlayfs: unrecognized mount option "xino=off" or missing value EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue overlayfs: unrecognized mount option "xino=off" or missing value overlayfs: fs on '.' does not support file handles, falling back to index=off. devpts: called with bogus options overlayfs: fs on '.' does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "xino=off" or missing value overlayfs: unrecognized mount option "xino=off" or missing value devpts: called with bogus options EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue devpts: called with bogus options devpts: called with bogus options overlayfs: fs on '.' does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "xino=off" or missing value devpts: called with bogus options overlayfs: unrecognized mount option "xino=off" or missing value devpts: called with bogus options overlayfs: unrecognized mount option "xino=off" or missing value devpts: called with bogus options EXT4-fs (loop3): Unrecognized mount option "/dev/loop3" or missing value EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue overlayfs: unrecognized mount option "xino=off" or missing value overlayfs: unrecognized mount option "xino=off" or missing value overlayfs: unrecognized mount option "xino=off" or missing value overlayfs: unrecognized mount option "xino=off" or missing value devpts: called with bogus options EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options overlayfs: unrecognized mount option "xino=off" or missing value overlayfs: unrecognized mount option "xino=off" or missing value devpts: called with bogus options devpts: called with bogus options audit: type=1804 audit(1651167373.233:6): pid=12229 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir3033581224/syzkaller.9VVfov/89/bus" dev="sda1" ino=13930 res=1 print_req_error: I/O error, dev loop0, sector 0 audit: type=1804 audit(1651167373.363:7): pid=12267 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir3033581224/syzkaller.9VVfov/91/memory.events" dev="sda1" ino=14038 res=1 EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue overlayfs: unrecognized mount option "xino=off" or missing value overlayfs: unrecognized mount option "xino=off" or missing value audit: type=1800 audit(1651167373.363:8): pid=12267 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="memory.events" dev="sda1" ino=14038 res=0 devpts: called with bogus options audit: type=1804 audit(1651167373.513:9): pid=12281 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir3033581224/syzkaller.9VVfov/92/memory.events" dev="sda1" ino=14084 res=1 audit: type=1800 audit(1651167373.513:10): pid=12281 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="memory.events" dev="sda1" ino=14084 res=0 devpts: called with bogus options audit: type=1804 audit(1651167373.653:11): pid=12293 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir3033581224/syzkaller.9VVfov/93/memory.events" dev="sda1" ino=13936 res=1 audit: type=1800 audit(1651167373.653:12): pid=12293 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="memory.events" dev="sda1" ino=13936 res=0 audit: type=1804 audit(1651167373.753:13): pid=12310 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir3033581224/syzkaller.9VVfov/94/memory.events" dev="sda1" ino=14035 res=1 print_req_error: I/O error, dev loop7, sector 0 Buffer I/O error on dev loop7, logical block 0, lost async page write print_req_error: I/O error, dev loop7, sector 4 Buffer I/O error on dev loop7, logical block 1, lost async page write print_req_error: I/O error, dev loop7, sector 8 Buffer I/O error on dev loop7, logical block 2, lost async page write print_req_error: I/O error, dev loop7, sector 12 Buffer I/O error on dev loop7, logical block 3, lost async page write print_req_error: I/O error, dev loop7, sector 16 Buffer I/O error on dev loop7, logical block 4, lost async page write print_req_error: I/O error, dev loop7, sector 20 Buffer I/O error on dev loop7, logical block 5, lost async page write print_req_error: I/O error, dev loop7, sector 24 Buffer I/O error on dev loop7, logical block 6, lost async page write print_req_error: I/O error, dev loop7, sector 28 Buffer I/O error on dev loop7, logical block 7, lost async page write print_req_error: I/O error, dev loop7, sector 32 Buffer I/O error on dev loop7, logical block 8, lost async page write Buffer I/O error on dev loop7, logical block 9, lost async page write overlayfs: unrecognized mount option "xino=off" or missing value EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue audit: type=1800 audit(1651167373.753:14): pid=12310 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="memory.events" dev="sda1" ino=14035 res=0 devpts: called with bogus options ntfs: (device loop4): parse_options(): Option utf8 is no longer supported, using option nls=utf8. Please use option nls=utf8 in the future and make sure utf8 is compiled either as a module or into the kernel. EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue