nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. ===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected 4.19.163-syzkaller #0 Not tainted ----------------------------------------------------- syz-executor483/8114 [HC0[0]:SC0[2]:HE1:SE0] is trying to acquire: 00000000ee0b61b2 (hugetlb_lock){+.+.}, at: spin_lock include/linux/spinlock.h:329 [inline] 00000000ee0b61b2 (hugetlb_lock){+.+.}, at: free_huge_page+0x482/0xd20 mm/hugetlb.c:1276 and this task is already holding: 00000000864bec6d (slock-AF_INET){+.-.}, at: spin_lock include/linux/spinlock.h:329 [inline] 00000000864bec6d (slock-AF_INET){+.-.}, at: tcp_close+0x5bd/0xfd0 net/ipv4/tcp.c:2434 which would create a new lock dependency: (slock-AF_INET){+.-.} -> (hugetlb_lock){+.+.} but this new dependency connects a SOFTIRQ-irq-safe lock: (slock-AF_INET){+.-.} ... which became SOFTIRQ-irq-safe at: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] sk_clone_lock+0x40b/0x1430 net/core/sock.c:1671 inet_csk_clone_lock+0x1f/0x3e0 net/ipv4/inet_connection_sock.c:821 tcp_create_openreq_child+0x2c/0x19f0 net/ipv4/tcp_minisocks.c:452 tcp_v4_syn_recv_sock+0xb6/0x1030 net/ipv4/tcp_ipv4.c:1426 tcp_check_req+0x601/0x16b0 net/ipv4/tcp_minisocks.c:789 tcp_v4_rcv+0x1e3c/0x3b80 net/ipv4/tcp_ipv4.c:1770 ip_local_deliver_finish+0x495/0xc00 net/ipv4/ip_input.c:215 NF_HOOK include/linux/netfilter.h:289 [inline] ip_local_deliver+0x188/0x500 net/ipv4/ip_input.c:256 dst_input include/net/dst.h:461 [inline] ip_rcv_finish+0x1ca/0x2e0 net/ipv4/ip_input.c:414 NF_HOOK include/linux/netfilter.h:289 [inline] ip_rcv+0xca/0x3c0 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:4954 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066 netif_receive_skb_internal+0xf0/0x3f0 net/core/dev.c:5156 napi_skb_finish net/core/dev.c:5600 [inline] napi_gro_receive+0x2e6/0x450 net/core/dev.c:5631 receive_buf+0xf1d/0x6120 drivers/net/virtio_net.c:1072 virtnet_receive drivers/net/virtio_net.c:1336 [inline] virtnet_poll+0x568/0xd70 drivers/net/virtio_net.c:1441 napi_poll net/core/dev.c:6272 [inline] net_rx_action+0x4ac/0xfb0 net/core/dev.c:6338 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292 run_ksoftirqd+0x57/0x110 kernel/softirq.c:653 smpboot_thread_fn+0x655/0x9e0 kernel/smpboot.c:164 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 to a SOFTIRQ-irq-unsafe lock: (hugetlb_lock){+.+.} ... which became SOFTIRQ-irq-unsafe at: ... __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] hugetlb_overcommit_handler+0x2d4/0x460 mm/hugetlb.c:2999 proc_sys_call_handler.isra.0+0x1f3/0x3b0 fs/proc/proc_sysctl.c:597 __vfs_write+0xf7/0x770 fs/read_write.c:485 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 other info that might help us debug this: Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(hugetlb_lock); local_irq_disable(); lock(slock-AF_INET); lock(hugetlb_lock); lock(slock-AF_INET); *** DEADLOCK *** 3 locks held by syz-executor483/8114: #0: 000000001e5e6bcd (&sb->s_type->i_mutex_key#13){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000001e5e6bcd (&sb->s_type->i_mutex_key#13){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578 #1: 00000000ae8cebee (sk_lock-AF_INET){+.+.}, at: lock_sock include/net/sock.h:1510 [inline] #1: 00000000ae8cebee (sk_lock-AF_INET){+.+.}, at: tcp_close+0x25/0xfd0 net/ipv4/tcp.c:2344 #2: 00000000864bec6d (slock-AF_INET){+.-.}, at: spin_lock include/linux/spinlock.h:329 [inline] #2: 00000000864bec6d (slock-AF_INET){+.-.}, at: tcp_close+0x5bd/0xfd0 net/ipv4/tcp.c:2434 the dependencies between SOFTIRQ-irq-safe lock and the holding lock: -> (slock-AF_INET){+.-.} ops: 6455 { HARDIRQ-ON-W at: __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:168 spin_lock_bh include/linux/spinlock.h:334 [inline] lock_sock_nested+0x3b/0x110 net/core/sock.c:2864 lock_sock include/net/sock.h:1510 [inline] inet_autobind+0x1a/0x190 net/ipv4/af_inet.c:179 inet_dgram_connect+0x245/0x2d0 net/ipv4/af_inet.c:569 __sys_connect+0x265/0x2c0 net/socket.c:1663 __do_sys_connect net/socket.c:1674 [inline] __se_sys_connect net/socket.c:1671 [inline] __x64_sys_connect+0x6f/0xb0 net/socket.c:1671 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe IN-SOFTIRQ-W at: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] sk_clone_lock+0x40b/0x1430 net/core/sock.c:1671 inet_csk_clone_lock+0x1f/0x3e0 net/ipv4/inet_connection_sock.c:821 tcp_create_openreq_child+0x2c/0x19f0 net/ipv4/tcp_minisocks.c:452 tcp_v4_syn_recv_sock+0xb6/0x1030 net/ipv4/tcp_ipv4.c:1426 tcp_check_req+0x601/0x16b0 net/ipv4/tcp_minisocks.c:789 tcp_v4_rcv+0x1e3c/0x3b80 net/ipv4/tcp_ipv4.c:1770 ip_local_deliver_finish+0x495/0xc00 net/ipv4/ip_input.c:215 NF_HOOK include/linux/netfilter.h:289 [inline] ip_local_deliver+0x188/0x500 net/ipv4/ip_input.c:256 dst_input include/net/dst.h:461 [inline] ip_rcv_finish+0x1ca/0x2e0 net/ipv4/ip_input.c:414 NF_HOOK include/linux/netfilter.h:289 [inline] ip_rcv+0xca/0x3c0 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:4954 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066 netif_receive_skb_internal+0xf0/0x3f0 net/core/dev.c:5156 napi_skb_finish net/core/dev.c:5600 [inline] napi_gro_receive+0x2e6/0x450 net/core/dev.c:5631 receive_buf+0xf1d/0x6120 drivers/net/virtio_net.c:1072 virtnet_receive drivers/net/virtio_net.c:1336 [inline] virtnet_poll+0x568/0xd70 drivers/net/virtio_net.c:1441 napi_poll net/core/dev.c:6272 [inline] net_rx_action+0x4ac/0xfb0 net/core/dev.c:6338 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292 run_ksoftirqd+0x57/0x110 kernel/softirq.c:653 smpboot_thread_fn+0x655/0x9e0 kernel/smpboot.c:164 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 INITIAL USE at: __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:168 spin_lock_bh include/linux/spinlock.h:334 [inline] lock_sock_nested+0x3b/0x110 net/core/sock.c:2864 lock_sock include/net/sock.h:1510 [inline] inet_autobind+0x1a/0x190 net/ipv4/af_inet.c:179 inet_dgram_connect+0x245/0x2d0 net/ipv4/af_inet.c:569 __sys_connect+0x265/0x2c0 net/socket.c:1663 __do_sys_connect net/socket.c:1674 [inline] __se_sys_connect net/socket.c:1671 [inline] __x64_sys_connect+0x6f/0xb0 net/socket.c:1671 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe } ... key at: [] af_family_slock_keys+0x10/0x1a0 ... acquired at: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] free_huge_page+0x482/0xd20 mm/hugetlb.c:1276 __put_page+0xe2/0x3a0 mm/swap.c:112 put_page include/linux/mm.h:963 [inline] __skb_frag_unref include/linux/skbuff.h:2828 [inline] skb_release_data+0x2f3/0x920 net/core/skbuff.c:568 skb_release_all net/core/skbuff.c:631 [inline] __kfree_skb+0x46/0x60 net/core/skbuff.c:645 sk_wmem_free_skb include/net/sock.h:1466 [inline] tcp_write_queue_purge+0x24d/0x800 net/ipv4/tcp.c:2543 tcp_v4_destroy_sock+0x101/0x770 net/ipv4/tcp_ipv4.c:1986 inet_csk_destroy_sock+0x189/0x400 net/ipv4/inet_connection_sock.c:872 tcp_close+0x95f/0xfd0 net/ipv4/tcp.c:2498 inet_release+0xd7/0x1e0 net/ipv4/af_inet.c:427 __sock_release+0xcd/0x2a0 net/socket.c:579 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xbed/0x2be0 kernel/exit.c:890 do_group_exit+0x125/0x310 kernel/exit.c:993 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode+0x277/0x2d0 arch/x86/entry/common.c:198 retint_user+0x8/0x18 the dependencies between the lock to be acquired and SOFTIRQ-irq-unsafe lock: -> (hugetlb_lock){+.+.} ops: 30 { HARDIRQ-ON-W at: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] hugetlb_overcommit_handler+0x2d4/0x460 mm/hugetlb.c:2999 proc_sys_call_handler.isra.0+0x1f3/0x3b0 fs/proc/proc_sysctl.c:597 __vfs_write+0xf7/0x770 fs/read_write.c:485 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 SOFTIRQ-ON-W at: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] hugetlb_overcommit_handler+0x2d4/0x460 mm/hugetlb.c:2999 proc_sys_call_handler.isra.0+0x1f3/0x3b0 fs/proc/proc_sysctl.c:597 __vfs_write+0xf7/0x770 fs/read_write.c:485 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 INITIAL USE at: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] hugetlb_overcommit_handler+0x2d4/0x460 mm/hugetlb.c:2999 proc_sys_call_handler.isra.0+0x1f3/0x3b0 fs/proc/proc_sysctl.c:597 __vfs_write+0xf7/0x770 fs/read_write.c:485 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 } ... key at: [] hugetlb_lock+0x18/0x17a0 ... acquired at: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] free_huge_page+0x482/0xd20 mm/hugetlb.c:1276 __put_page+0xe2/0x3a0 mm/swap.c:112 put_page include/linux/mm.h:963 [inline] __skb_frag_unref include/linux/skbuff.h:2828 [inline] skb_release_data+0x2f3/0x920 net/core/skbuff.c:568 skb_release_all net/core/skbuff.c:631 [inline] __kfree_skb+0x46/0x60 net/core/skbuff.c:645 sk_wmem_free_skb include/net/sock.h:1466 [inline] tcp_write_queue_purge+0x24d/0x800 net/ipv4/tcp.c:2543 tcp_v4_destroy_sock+0x101/0x770 net/ipv4/tcp_ipv4.c:1986 inet_csk_destroy_sock+0x189/0x400 net/ipv4/inet_connection_sock.c:872 tcp_close+0x95f/0xfd0 net/ipv4/tcp.c:2498 inet_release+0xd7/0x1e0 net/ipv4/af_inet.c:427 __sock_release+0xcd/0x2a0 net/socket.c:579 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xbed/0x2be0 kernel/exit.c:890 do_group_exit+0x125/0x310 kernel/exit.c:993 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode+0x277/0x2d0 arch/x86/entry/common.c:198 retint_user+0x8/0x18 stack backtrace: CPU: 0 PID: 8114 Comm: syz-executor483 Not tainted 4.19.163-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 print_bad_irq_dependency kernel/locking/lockdep.c:1572 [inline] check_usage.cold+0x7ea/0xbad kernel/locking/lockdep.c:1604 check_irq_usage kernel/locking/lockdep.c:1660 [inline] check_prev_add_irq kernel/locking/lockdep_states.h:8 [inline] check_prev_add kernel/locking/lockdep.c:1870 [inline] check_prevs_add kernel/locking/lockdep.c:1978 [inline] validate_chain kernel/locking/lockdep.c:2419 [inline] __lock_acquire+0x1da1/0x3ff0 kernel/locking/lockdep.c:3415 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] free_huge_page+0x482/0xd20 mm/hugetlb.c:1276 __put_page+0xe2/0x3a0 mm/swap.c:112 put_page include/linux/mm.h:963 [inline] __skb_frag_unref include/linux/skbuff.h:2828 [inline] skb_release_data+0x2f3/0x920 net/core/skbuff.c:568 skb_release_all net/core/skbuff.c:631 [inline] __kfree_skb+0x46/0x60 net/core/skbuff.c:645 sk_wmem_free_skb include/net/sock.h:1466 [inline] tcp_write_queue_purge+0x24d/0x800 net/ipv4/tcp.c:2543 tcp_v4_destroy_sock+0x101/0x770 net/ipv4/tcp_ipv4.c:1986 inet_csk_destroy_sock+0x189/0x400 net/ipv4/inet_connection_sock.c:872 tcp_close+0x95f/0xfd0 net/ipv4/tcp.c:2498 inet_release+0xd7/0x1e0 net/ipv4/af_inet.c:427 __sock_release+0xcd/0x2a0 net/socket.c:579 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xbed/0x2be0 kernel/exit.c:890 do_group_exit+0x125/0x310 kernel/exit.c:993 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode+0x277/0x2d0 arch/x86/entry/common.c:198 retint_user+0x8/0x18 RIP: 0033:0x401072 Code: Bad RIP value. RSP: 002b:00007f2a80855da0 EFLAGS: 00010293 RAX: 0000000000000003 RBX: 00000000006dbc48 RCX: 0000000000446b39 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000002 RBP: 00000000006dbc40 R08: 000000000000204e R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc4c R13: 44d9effa3f410d0d R14: b1c59e31819ff2c8 R15: 8effb11713110d7c