watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.1:18887] Modules linked in: irq event stamp: 2560591 hardirqs last enabled at (2560590): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (2560591): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (2555000): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (2555003): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (2555003): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 1 PID: 18887 Comm: syz-executor.1 Not tainted 4.19.206-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:deref_stack_reg+0x178/0x1d0 arch/x86/kernel/unwind_orc.c:336 Code: 89 6d 00 b8 01 00 00 00 48 ba 00 00 00 00 00 fc ff df 48 c7 04 13 00 00 00 00 48 8b 4c 24 60 65 48 2b 0c 25 28 00 00 00 75 47 <48> 83 c4 68 5b 5d 41 5c 41 5d 41 5e c3 e8 76 d4 6e 00 e9 ec fe ff RSP: 0018:ffff8880ba106808 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 1ffff11017420d02 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffff8880ba106830 RDI: ffff8880b0e0f990 RBP: ffff88806823ed00 R08: 0000000000000001 R09: 0000000000000001 R10: ffff8880ba106a2f R11: 0000000000074071 R12: ffff8880ba1069d0 R13: ffff8880ba106a10 R14: ffff8880b0e08000 R15: ffffffff8bf562e8 FS: 00007ff3c0885700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555573bc848 CR3: 00000000aae15000 CR4: 00000000001406e0 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 __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3703 __kmalloc_reserve net/core/skbuff.c:137 [inline] __alloc_skb+0xae/0x560 net/core/skbuff.c:205 skb_copy+0x139/0x2f0 net/core/skbuff.c:1358 mac80211_hwsim_tx_frame_no_nl.isra.0+0xb8a/0x1330 drivers/net/wireless/mac80211_hwsim.c:1353 mac80211_hwsim_tx+0x58f/0x12f0 drivers/net/wireless/mac80211_hwsim.c:1453 drv_tx net/mac80211/driver-ops.h:36 [inline] ieee80211_tx_frags+0x570/0x9d0 net/mac80211/tx.c:1661 __ieee80211_tx+0x1b1/0x5f0 net/mac80211/tx.c:1723 ieee80211_tx+0x355/0x3e0 net/mac80211/tx.c:1909 ieee80211_xmit+0x380/0x480 net/mac80211/tx.c:2003 __ieee80211_subif_start_xmit+0x51b/0x970 net/mac80211/tx.c:3714 ieee80211_subif_start_xmit+0xeb/0xef0 net/mac80211/tx.c:3850 __netdev_start_xmit include/linux/netdevice.h:4349 [inline] netdev_start_xmit include/linux/netdevice.h:4363 [inline] xmit_one net/core/dev.c:3256 [inline] dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272 sch_direct_xmit+0x2d6/0xf50 net/sched/sch_generic.c:332 qdisc_restart net/sched/sch_generic.c:395 [inline] __qdisc_run+0x4d0/0x1640 net/sched/sch_generic.c:403 qdisc_run include/net/pkt_sched.h:120 [inline] __dev_xmit_skb net/core/dev.c:3451 [inline] __dev_queue_xmit+0x2102/0x2e00 net/core/dev.c:3807 neigh_resolve_output+0x55a/0x910 net/core/neighbour.c:1374 neigh_output include/net/neighbour.h:501 [inline] ip6_finish_output2+0x113d/0x2290 net/ipv6/ip6_output.c:120 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] ndisc_send_skb+0xa24/0x1720 net/ipv6/ndisc.c:491 ndisc_send_rs+0x131/0x690 net/ipv6/ndisc.c:685 addrconf_rs_timer+0x384/0x6a0 net/ipv6/addrconf.c:3835 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __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:schedule_debug kernel/sched/core.c:3329 [inline] RIP: 0010:__schedule+0x110/0x2040 kernel/sched/core.c:3439 Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 f2 19 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 74 24 18 4c 89 f2 48 c1 ea 03 80 3c 02 00 <0f> 85 c5 19 00 00 49 81 3e 9d 6e ac 57 0f 85 09 1f 00 00 65 8b 05 RSP: 0018:ffff8880b0e0e830 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffc90007f39000 RDX: 1ffff110161c1000 RSI: ffffffff83771eb1 RDI: ffff8880b2ca42d8 RBP: ffff8880b0e0e8f8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880b2ca42c0 R13: 000000000002b0c0 R14: ffff8880b0e08000 R15: ffff8880ba12b0c0 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:3641 ___preempt_schedule+0x16/0x18 rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1081 [inline] rcu_lockdep_current_cpu_online+0x16d/0x1b0 kernel/rcu/tree.c:1068 rcu_read_lock_held+0xc3/0x110 kernel/rcu/update.c:285 fib6_node_lookup_1+0x1a0/0x910 net/ipv6/ip6_fib.c:1416 fib6_node_lookup+0xbe/0x170 net/ipv6/ip6_fib.c:1485 fib6_table_lookup+0xb3/0xf40 net/ipv6/route.c:1869 ip6_pol_route+0x180/0x1270 net/ipv6/route.c:1909 fib6_rule_lookup+0x10b/0x4e0 net/ipv6/fib6_rules.c:118 ip6_route_output_flags+0x2b0/0x350 net/ipv6/route.c:2163 ip6_dst_lookup_tail+0x566/0x19b0 net/ipv6/ip6_output.c:1019 ip6_dst_lookup_flow+0x8c/0x1d0 net/ipv6/ip6_output.c:1120 sctp_v6_get_dst+0x69f/0x1c90 net/sctp/ipv6.c:291 sctp_transport_pmtu+0x245/0x470 net/sctp/transport.c:242 sctp_transport_route+0x15b/0x350 net/sctp/transport.c:319 sctp_assoc_add_peer+0x5bf/0x1050 net/sctp/associola.c:677 sctp_process_param net/sctp/sm_make_chunk.c:2546 [inline] sctp_process_init+0x250a/0x2b60 net/sctp/sm_make_chunk.c:2366 sctp_cmd_process_init net/sctp/sm_sideeffect.c:682 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1391 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0x173e/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:950 [inline] __release_sock+0x134/0x3a0 net/core/sock.c:2344 release_sock+0x54/0x1b0 net/core/sock.c:2881 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: 0033:0x7ff3c330e739 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff3c0885188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007ff3c3412f80 RCX: 00007ff3c330e739 RDX: 000000000000006b RSI: 0000000000000084 RDI: 0000000000000005 RBP: 00007ff3c3368cc4 R08: 000000000000001c R09: 0000000000000000 R10: 000000002055bfe4 R11: 0000000000000246 R12: 00007ff3c3412f80 R13: 00007fff17d4090f R14: 00007ff3c0885300 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): 0: 89 6d 00 mov %ebp,0x0(%rbp) 3: b8 01 00 00 00 mov $0x1,%eax 8: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx f: fc ff df 12: 48 c7 04 13 00 00 00 movq $0x0,(%rbx,%rdx,1) 19: 00 1a: 48 8b 4c 24 60 mov 0x60(%rsp),%rcx 1f: 65 48 2b 0c 25 28 00 sub %gs:0x28,%rcx 26: 00 00 28: 75 47 jne 0x71 * 2a: 48 83 c4 68 add $0x68,%rsp <-- trapping instruction 2e: 5b pop %rbx 2f: 5d pop %rbp 30: 41 5c pop %r12 32: 41 5d pop %r13 34: 41 5e pop %r14 36: c3 retq 37: e8 76 d4 6e 00 callq 0x6ed4b2 3c: e9 .byte 0xe9 3d: ec in (%dx),%al 3e: fe (bad) 3f: ff .byte 0xff