watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor386:9617] Modules linked in: irq event stamp: 2778735 hardirqs last enabled at (2778734): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (2778735): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (2742486): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (2742489): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (2742489): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 0 PID: 9617 Comm: syz-executor386 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:41 [inline] RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:321 [inline] RIP: 0010:deref_stack_reg+0x9d/0x1d0 arch/x86/kernel/unwind_orc.c:331 Code: 3c 03 0f 8e 0a 01 00 00 41 8b 04 24 85 c0 74 62 49 8d 7c 24 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 00 01 00 00 49 8d 7c 24 10 4d 8b 74 24 08 48 b8 00 00 00 00 RSP: 0018:ffff8880ba006c98 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff11017400d94 RCX: 0000000000000000 RDX: 1ffff11017400dcd RSI: ffff8880ba0079f0 RDI: ffff8880ba006e68 RBP: ffff8880ba0079f0 R08: 0000000000000001 R09: 0000000000000001 R10: ffff8880ba006ebf R11: 0000000000074071 R12: ffff8880ba006e60 R13: ffff8880ba006ea0 R14: ffff8880ba006e60 R15: ffffffff8c066c2a FS: 00007f0a3c191700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555561442b8 CR3: 000000009bbec000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unwind_next_frame+0xf83/0x1400 arch/x86/kernel/unwind_orc.c:555 __save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553 slab_post_alloc_hook mm/slab.h:445 [inline] slab_alloc_node mm/slab.c:3340 [inline] kmem_cache_alloc_node+0x133/0x3b0 mm/slab.c:3647 __alloc_skb+0x71/0x560 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:995 [inline] sctp_packet_transmit+0x246/0x3660 net/sctp/output.c:584 sctp_outq_flush_transports+0x19d/0x340 net/sctp/outqueue.c:1166 sctp_outq_flush net/sctp/outqueue.c:1214 [inline] sctp_outq_uncork+0x185/0x200 net/sctp/outqueue.c:777 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1815 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0x72a/0x5110 net/sctp/sm_sideeffect.c:1170 sctp_assoc_bh_rcv+0x345/0x650 net/sctp/associola.c:1073 sctp_inq_push+0x1da/0x270 net/sctp/inqueue.c:95 sctp_rcv+0x1642/0x3300 net/sctp/input.c:268 sctp6_rcv+0x12/0x30 net/sctp/ipv6.c:1072 ip6_input_finish+0x46a/0x17a0 net/ipv6/ip6_input.c:385 NF_HOOK include/linux/netfilter.h:289 [inline] ip6_input+0xcf/0x3c0 net/ipv6/ip6_input.c:428 dst_input include/net/dst.h:461 [inline] ip6_rcv_finish+0x1d9/0x2f0 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:289 [inline] ipv6_rcv+0xf2/0x3f0 net/ipv6/ip6_input.c:273 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:4954 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066 process_backlog+0x241/0x700 net/core/dev.c:5849 napi_poll net/core/dev.c:6280 [inline] net_rx_action+0x4ac/0xfb0 net/core/dev.c:6346 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:preempt_schedule_irq+0xab/0x140 kernel/sched/core.c:3744 Code: 29 f9 e8 58 3f 4f f9 4c 89 e8 48 c1 e8 03 80 3c 18 00 75 69 48 83 3d 9b 18 d9 01 00 74 5b fb 66 0f 1f 44 00 00 bf 01 00 00 00 40 d1 ff ff 48 c7 c0 90 82 f1 89 48 c1 e8 03 80 3c 18 00 75 4b RSP: 0018:ffff88809902ecb0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3053 RBX: dffffc0000000000 RCX: 1ffff11013195965 RDX: 0000000000000000 RSI: ffff888098cacb30 RDI: 0000000000000001 RBP: ffffed1013195850 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888098cac280 R13: ffffffff89f18298 R14: 0000000000000000 R15: 0000000000000000 retint_kernel+0x1b/0x2d RIP: 0010:should_resched arch/x86/include/asm/preempt.h:99 [inline] RIP: 0010:__local_bh_enable_ip+0x18d/0x270 kernel/softirq.c:196 Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 dd 00 00 00 48 83 3d c8 5f b8 08 00 0f 84 8d 00 00 00 fb 66 0f 1f 44 00 00 <65> 8b 05 6c bc c8 7e 85 c0 74 7d 5b 5d 41 5c c3 80 3d f3 87 d5 09 RSP: 0018:ffff88809902ed88 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3053 RBX: 0000000000000200 RCX: 1ffff11013195965 RDX: dffffc0000000000 RSI: ffff888098cacb30 RDI: ffff888098cacb04 RBP: ffffffff870217f6 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888098cac280 R13: 0000000000000010 R14: 000000000000000e R15: ffff888098e93040 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:721 [inline] ip6_finish_output2+0x11a9/0x2290 net/ipv6/ip6_output.c:121 ip6_finish_output+0x89b/0x10f0 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x205/0x770 net/ipv6/ip6_output.c:209 dst_output include/net/dst.h:455 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] ip6_xmit+0xdbf/0x20a0 net/ipv6/ip6_output.c:313 sctp_v6_xmit+0x377/0x710 net/sctp/ipv6.c:229 sctp_packet_transmit+0x1e21/0x3660 net/sctp/output.c:641 sctp_outq_flush_transports+0x19d/0x340 net/sctp/outqueue.c:1166 sctp_outq_flush net/sctp/outqueue.c:1214 [inline] sctp_outq_uncork+0x185/0x200 net/sctp/outqueue.c:777 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1815 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0x72a/0x5110 net/sctp/sm_sideeffect.c:1170 sctp_assoc_bh_rcv+0x345/0x650 net/sctp/associola.c:1073 sctp_inq_push+0x1da/0x270 net/sctp/inqueue.c:95 sctp_backlog_rcv+0x1e9/0x11e0 net/sctp/input.c:356 sk_backlog_rcv include/net/sock.h:952 [inline] __release_sock+0x134/0x3a0 net/core/sock.c:2362 release_sock+0x54/0x1b0 net/core/sock.c:2901 sctp_wait_for_connect+0x301/0x530 net/sctp/socket.c:8635 __sctp_connect+0xb6e/0xd00 net/sctp/socket.c:1273 __sctp_setsockopt_connectx+0x132/0x1c0 net/sctp/socket.c:1381 sctp_setsockopt_connectx_old net/sctp/socket.c:1397 [inline] sctp_setsockopt+0x29d9/0x4b40 net/sctp/socket.c:4354 __sys_setsockopt+0x14d/0x240 net/socket.c:2013 __do_sys_setsockopt net/socket.c:2024 [inline] __se_sys_setsockopt net/socket.c:2021 [inline] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2021 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f0a3c1e3749 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 15 00 00 90 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:00007f0a3c191308 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f0a3c26c4c8 RCX: 00007f0a3c1e3749 RDX: 000000000000006b RSI: 0000000000000084 RDI: 0000000000000005 RBP: 00007f0a3c26c4c0 R08: 000000000000001c R09: 0000000000000000 R10: 000000002055bfe4 R11: 0000000000000246 R12: 00007f0a3c26c4cc R13: 00007f0a3c2394cc R14: 0100000000000000 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 3c 03 cmp $0x3,%al 2: 0f 8e 0a 01 00 00 jle 0x112 8: 41 8b 04 24 mov (%r12),%eax c: 85 c0 test %eax,%eax e: 74 62 je 0x72 10: 49 8d 7c 24 08 lea 0x8(%r12),%rdi 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 48 89 fa mov %rdi,%rdx 22: 48 c1 ea 03 shr $0x3,%rdx 26: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) * 2a: 0f 85 00 01 00 00 jne 0x130 <-- trapping instruction 30: 49 8d 7c 24 10 lea 0x10(%r12),%rdi 35: 4d 8b 74 24 08 mov 0x8(%r12),%r14 3a: 48 rex.W 3b: b8 00 00 00 00 mov $0x0,%eax