watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [syz-executor.2:3450] Modules linked in: irq event stamp: 49190903 hardirqs last enabled at (49190902): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (49190902): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (49190902): [] ktime_get+0x235/0x2f0 kernel/time/timekeeping.c:756 hardirqs last disabled at (49190903): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (842): [] spin_unlock include/linux/spinlock.h:369 [inline] softirqs last enabled at (842): [] nf_conntrack_double_unlock net/netfilter/nf_conntrack_core.c:119 [inline] softirqs last enabled at (842): [] __nf_conntrack_confirm+0x156f/0x2ff0 net/netfilter/nf_conntrack_core.c:998 softirqs last disabled at (844): [] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline] softirqs last disabled at (844): [] ip_finish_output2+0x28d/0x15a0 net/ipv4/ip_output.c:214 CPU: 1 PID: 3450 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x47/0x50 kernel/kcov.c:111 Code: 90 60 13 00 00 83 fa 02 75 20 48 8b 88 68 13 00 00 8b 80 64 13 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 0f 1f 84 00 00 00 00 00 49 89 f1 49 89 fa 65 48 8b 34 25 c0 df RSP: 0018:ffff88804e7b7028 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: ffff88809d47dd00 RCX: ffffc900088ba000 RDX: 0000000000040000 RSI: ffffffff868c170e RDI: 0000000000000005 RBP: ffffed1013a8fba0 R08: 0000000000000000 R09: 0000000000000006 R10: 0000000000000005 R11: ffffffff8c66505b R12: 0000000000000006 R13: dffffc0000000000 R14: ffff88809d01ad68 R15: ffff88804e7b7170 FS: 00007f401d7ba700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555555e64808 CR3: 00000000b5bd3000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tcf_action_exec net/sched/act_api.c:618 [inline] tcf_action_exec+0x12e/0x400 net/sched/act_api.c:598 tcf_exts_exec include/net/pkt_cls.h:388 [inline] basic_classify+0x184/0x2b0 net/sched/cls_basic.c:52 tcf_classify+0x120/0x3c0 net/sched/cls_api.c:979 prio_classify net/sched/sch_prio.c:46 [inline] prio_enqueue+0x3bb/0x7a0 net/sched/sch_prio.c:78 __dev_xmit_skb net/core/dev.c:3494 [inline] __dev_queue_xmit+0x140a/0x2e00 net/core/dev.c:3807 neigh_hh_output include/net/neighbour.h:491 [inline] neigh_output include/net/neighbour.h:499 [inline] ip_finish_output2+0xb6d/0x15a0 net/ipv4/ip_output.c:230 ip_finish_output+0xae9/0x10b0 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x203/0x5f0 net/ipv4/ip_output.c:406 dst_output include/net/dst.h:455 [inline] ip_local_out+0xaf/0x170 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x91e/0x1c10 net/ipv4/ip_output.c:507 __tcp_transmit_skb+0x1b9c/0x3400 net/ipv4/tcp_output.c:1148 tcp_transmit_skb net/ipv4/tcp_output.c:1164 [inline] tcp_send_syn_data net/ipv4/tcp_output.c:3489 [inline] tcp_connect+0x1130/0x24e0 net/ipv4/tcp_output.c:3528 tcp_v4_connect+0x140c/0x1aa0 net/ipv4/tcp_ipv4.c:318 __inet_stream_connect+0x7e4/0xe00 net/ipv4/af_inet.c:655 tcp_sendmsg_fastopen net/ipv4/tcp.c:1187 [inline] tcp_sendmsg_locked+0x2267/0x2f60 net/ipv4/tcp.c:1234 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1462 inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 __sys_sendto+0x21a/0x320 net/socket.c:1899 __do_sys_sendto net/socket.c:1911 [inline] __se_sys_sendto net/socket.c:1907 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1907 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f401ee66049 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:00007f401d7ba168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f401ef79030 RCX: 00007f401ee66049 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 00007f401eec008d R08: 0000000020000080 R09: 0000000000000010 R10: 0000000020020080 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdbddc66cf R14: 00007f401d7ba300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 13 00 adc (%rax),%eax 2: 00 83 fa 02 75 20 add %al,0x207502fa(%rbx) 8: 48 8b 88 68 13 00 00 mov 0x1368(%rax),%rcx f: 8b 80 64 13 00 00 mov 0x1364(%rax),%eax 15: 48 8b 11 mov (%rcx),%rdx 18: 48 83 c2 01 add $0x1,%rdx 1c: 48 39 d0 cmp %rdx,%rax 1f: 76 07 jbe 0x28 21: 48 89 34 d1 mov %rsi,(%rcx,%rdx,8) 25: 48 89 11 mov %rdx,(%rcx) * 28: c3 retq <-- trapping instruction 29: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 30: 00 31: 49 89 f1 mov %rsi,%r9 34: 49 89 fa mov %rdi,%r10 37: 65 gs 38: 48 rex.W 39: 8b .byte 0x8b 3a: 34 25 xor $0x25,%al 3c: c0 .byte 0xc0 3d: df .byte 0xdf