====================================================== WARNING: possible circular locking dependency detected 4.14.305-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/8006 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [] unregister_netdevice_notifier+0x5e/0x2b0 net/core/dev.c:1630 but task is already holding lock: (&xt[i].mutex){+.+.}, at: [] xt_find_table_lock+0x38/0x3d0 net/netfilter/x_tables.c:1088 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&xt[i].mutex){+.+.}: __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:2461 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x651/0xbc0 net/netlink/af_netlink.c:1900 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+0x5e/0xd3 -> #0 (rtnl_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 unregister_netdevice_notifier+0x5e/0x2b0 net/core/dev.c:1630 tee_tg_destroy+0x5c/0xb0 net/netfilter/xt_TEE.c:123 cleanup_entry+0x232/0x310 net/ipv6/netfilter/ip6_tables.c:685 __do_replace+0x38d/0x580 net/ipv4/netfilter/arp_tables.c:930 do_replace net/ipv6/netfilter/ip6_tables.c:1162 [inline] do_ip6t_set_ctl+0x256/0x3b0 net/ipv6/netfilter/ip6_tables.c:1688 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x5f/0xb0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0xc0/0x120 net/ipv6/ipv6_sockglue.c:944 tcp_setsockopt+0x7b/0xc0 net/ipv4/tcp.c:2831 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+0x5e/0xd3 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&xt[i].mutex); lock(rtnl_mutex); lock(&xt[i].mutex); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz-executor.5/8006: #0: (&xt[i].mutex){+.+.}, at: [] xt_find_table_lock+0x38/0x3d0 net/netfilter/x_tables.c:1088 stack backtrace: CPU: 0 PID: 8006 Comm: syz-executor.5 Not tainted 4.14.305-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 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 unregister_netdevice_notifier+0x5e/0x2b0 net/core/dev.c:1630 tee_tg_destroy+0x5c/0xb0 net/netfilter/xt_TEE.c:123 cleanup_entry+0x232/0x310 net/ipv6/netfilter/ip6_tables.c:685 __do_replace+0x38d/0x580 net/ipv4/netfilter/arp_tables.c:930 do_replace net/ipv6/netfilter/ip6_tables.c:1162 [inline] do_ip6t_set_ctl+0x256/0x3b0 net/ipv6/netfilter/ip6_tables.c:1688 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x5f/0xb0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0xc0/0x120 net/ipv6/ipv6_sockglue.c:944 tcp_setsockopt+0x7b/0xc0 net/ipv4/tcp.c:2831 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+0x5e/0xd3 RIP: 0033:0x7f066525b74a RSP: 002b:00007ffd3b7e1768 EFLAGS: 00000206 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000029 RCX: 00007f066525b74a RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 00007ffd3b7e1790 R08: 00000000000002e8 R09: ffffffffff000000 R10: 00007f0665353000 R11: 0000000000000206 R12: 00007ffd3b7e17f0 R13: 0000000000000003 R14: 00007ffd3b7e178c R15: 00007f0665352fa0 EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop3): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 25 vs 150994969 free clusters EXT4-fs (loop3): Delayed block allocation failed for inode 18 at logical offset 0 with max blocks 1 with error 28 EXT4-fs (loop3): This should not happen!! Data will be lost ip6_tables: ip6tables: counters copy to user failed while replacing table EXT4-fs (loop3): Total free blocks count 0 EXT4-fs (loop3): Free/Dirty block details EXT4-fs (loop3): free_blocks=2415919104 EXT4-fs (loop3): dirty_blocks=16 EXT4-fs (loop3): Block reservation details EXT4-fs (loop3): i_reserved_data_blocks=1 ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 nla_parse: 39 callbacks suppressed netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. ip6_tunnel: non-ECT from fc01:0000:0000:0000:0000:0000:0000:0000 with DS=0x62 overlayfs: failed to clone upperpath ip6_tunnel: non-ECT from fc01:0000:0000:0000:0000:0000:0000:0000 with DS=0x62 ip6_tunnel: non-ECT from fc01:0000:0000:0000:0000:0000:0000:0000 with DS=0x62 ip6_tunnel: non-ECT from fc01:0000:0000:0000:0000:0000:0000:0000 with DS=0x62 overlayfs: failed to clone upperpath overlayfs: failed to clone upperpath overlayfs: failed to clone upperpath ip6_tunnel: non-ECT from fc01:0000:0000:0000:0000:0000:0000:0000 with DS=0x62 EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue ip6_tunnel: non-ECT from fc01:0000:0000:0000:0000:0000:0000:0000 with DS=0x62 overlayfs: fs on 'file0' does not support file handles, falling back to index=off. EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: failed to clone upperpath overlayfs: failed to clone upperpath overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: failed to clone lowerpath overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: failed to clone upperpath overlayfs: fs on './file0' does not support file handles, falling back to index=off. EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue overlayfs: failed to clone lowerpath overlayfs: failed to clone upperpath overlayfs: failed to clone upperpath overlayfs: failed to clone lowerpath overlayfs: failed to clone upperpath overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: failed to clone lowerpath overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: failed to clone upperpath overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue overlayfs: failed to clone lowerpath overlayfs: failed to clone upperpath overlayfs: failed to clone lowerpath overlayfs: failed to clone upperpath overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: failed to clone lowerpath overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: failed to clone upperpath overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: failed to clone lowerpath overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: failed to clone upperpath kauditd_printk_skb: 7 callbacks suppressed audit: type=1804 audit(1676047750.621:255): pid=15182 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="bus" dev="sda1" ino=13974 res=1 overlayfs: failed to clone lowerpath overlayfs: failed to clone upperpath UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) audit: type=1800 audit(1676047751.521:256): pid=15212 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="file0" dev="sda1" ino=13885 res=0 audit: type=1804 audit(1676047751.541:257): pid=15212 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="file0" dev="sda1" ino=13885 res=1 overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. audit: type=1800 audit(1676047751.911:258): pid=15225 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=14089 res=0 audit: type=1800 audit(1676047752.011:259): pid=15232 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=14139 res=0 UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) audit: type=1800 audit(1676047752.171:260): pid=15242 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=14324 res=0 audit: type=1800 audit(1676047752.341:261): pid=15250 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=13917 res=0