syzbot


BUG: soft lockup in br_handle_frame

Status: auto-closed as invalid on 2020/01/09 20:54
Reported-by: syzbot+3f599ae172cb5609847c@syzkaller.appspotmail.com
First crash: 1024d, last: 1022d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: rcu detected stall in br_handle_frame (2) C error 28 86d 623d 0/1 upstream: reported C repro on 2020/10/14 18:56

Sample crash report:
vhci_hcd: SetHubDepth req not supported for USB 2.0 roothub
XFS (loop2): no-recovery mounts must be read-only.
watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [ksoftirqd/1:17]
Modules linked in:
irq event stamp: 1495275
hardirqs last  enabled at (1495274): [<ffffffff86200979>] restore_regs_and_return_to_kernel+0x0/0x27
hardirqs last disabled at (1495275): [<ffffffff86201b01>] apic_timer_interrupt+0x91/0xa0 arch/x86/entry/entry_64.S:792
softirqs last  enabled at (1468738): [<ffffffff86400645>] __do_softirq+0x645/0x9a0 kernel/softirq.c:314
softirqs last disabled at (1468743): [<ffffffff8138a9dc>] run_ksoftirqd kernel/softirq.c:670 [inline]
softirqs last disabled at (1468743): [<ffffffff8138a9dc>] run_ksoftirqd+0x8c/0x1b0 kernel/softirq.c:662
CPU: 1 PID: 17 Comm: ksoftirqd/1 Not tainted 4.14.143 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a9d5c480 task.stack: ffff8880a9d60000
RIP: 0010:cpu_relax arch/x86/include/asm/processor.h:661 [inline]
RIP: 0010:virt_spin_lock arch/x86/include/asm/qspinlock.h:87 [inline]
RIP: 0010:native_queued_spin_lock_slowpath+0x302/0x750 kernel/locking/qspinlock.c:313
RSP: 0018:ffff8880a9d66c68 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000001 RBX: ffff8880911b1ba0 RCX: dffffc0000000000
RDX: 1ffffffff0ee2a98 RSI: 0000000000000001 RDI: ffff8880911b1ba0
RBP: ffff8880a9d66c98 R08: 0000000000000001 R09: ffff8880a9d66a28
R10: ffff8880a9d669f8 R11: ffff8880a9d5c480 R12: 0000000000000001
R13: 0000000000000003 R14: ffffed1012236374 R15: ffff8880911b1be8
FS:  0000000000000000(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001bed0b8 CR3: 0000000059643000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:669 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:52 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:90 [inline]
 do_raw_spin_lock+0x190/0x230 kernel/locking/spinlock_debug.c:113
 __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_lock+0x37/0x40 kernel/locking/spinlock.c:152
 spin_lock include/linux/spinlock.h:317 [inline]
 __dev_xmit_skb net/core/dev.c:3204 [inline]
 __dev_queue_xmit+0x11c0/0x25e0 net/core/dev.c:3493
 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558
 br_dev_queue_push_xmit+0x367/0x530 net/bridge/br_forward.c:55
 br_nf_dev_queue_xmit+0x307/0x1440 net/bridge/br_netfilter_hooks.c:776
 NF_HOOK include/linux/netfilter.h:250 [inline]
 NF_HOOK include/linux/netfilter.h:244 [inline]
 br_nf_post_routing+0xb80/0xf00 net/bridge/br_netfilter_hooks.c:822
 nf_hook_entry_hookfn include/linux/netfilter.h:108 [inline]
 nf_hook_slow+0xaf/0x1b0 net/netfilter/core.c:467
 nf_hook include/linux/netfilter.h:205 [inline]
 NF_HOOK include/linux/netfilter.h:248 [inline]
 br_forward_finish+0x1b7/0x320 net/bridge/br_forward.c:67
 br_nf_hook_thresh+0x25b/0x2e0 net/bridge/br_netfilter_hooks.c:1005
 br_nf_forward_finish+0x264/0x640 net/bridge/br_netfilter_hooks.c:550
 NF_HOOK include/linux/netfilter.h:250 [inline]
 NF_HOOK include/linux/netfilter.h:244 [inline]
 br_nf_forward_ip net/bridge/br_netfilter_hooks.c:617 [inline]
 br_nf_forward_ip+0x5fc/0x11d0 net/bridge/br_netfilter_hooks.c:561
 nf_hook_entry_hookfn include/linux/netfilter.h:108 [inline]
 nf_hook_slow+0xaf/0x1b0 net/netfilter/core.c:467
 nf_hook include/linux/netfilter.h:205 [inline]
 NF_HOOK include/linux/netfilter.h:248 [inline]
 __br_forward+0x312/0x9c0 net/bridge/br_forward.c:111
 deliver_clone+0x61/0xc0 net/bridge/br_forward.c:127
 br_flood+0x43c/0x530 net/bridge/br_forward.c:222
 br_handle_frame_finish+0xaf0/0x1830 net/bridge/br_input.c:210
 br_nf_hook_thresh+0x25b/0x2e0 net/bridge/br_netfilter_hooks.c:1005
 br_nf_pre_routing_finish_ipv6+0x621/0xc50 net/bridge/br_netfilter_ipv6.c:210
 NF_HOOK include/linux/netfilter.h:250 [inline]
 br_nf_pre_routing_ipv6+0x417/0x790 net/bridge/br_netfilter_ipv6.c:240
 br_nf_pre_routing+0xdce/0x12c7 net/bridge/br_netfilter_hooks.c:491
 nf_hook_entry_hookfn include/linux/netfilter.h:108 [inline]
 nf_hook_slow+0xaf/0x1b0 net/netfilter/core.c:467
 nf_hook include/linux/netfilter.h:205 [inline]
 NF_HOOK include/linux/netfilter.h:248 [inline]
 br_handle_frame+0x80c/0x1110 net/bridge/br_input.c:348
 __netif_receive_skb_core+0x789/0x2ca0 net/core/dev.c:4431
 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4515
 process_backlog+0x21f/0x730 net/core/dev.c:5197
 napi_poll net/core/dev.c:5598 [inline]
 net_rx_action+0x490/0xf80 net/core/dev.c:5664
 __do_softirq+0x244/0x9a0 kernel/softirq.c:288
 run_ksoftirqd kernel/softirq.c:670 [inline]
 run_ksoftirqd+0x8c/0x1b0 kernel/softirq.c:662
 smpboot_thread_fn+0x5f4/0x960 kernel/smpboot.c:164
 kthread+0x319/0x430 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 4c 89 e2 48 c1 ea 03 80 3c 02 00 0f 85 6b 03 00 00 49 8b 04 24 48 85 c0 0f 84 54 01 00 00 48 89 c1 0f 18 08 e9 4b 01 00 00 f3 90 <e9> 37 fd ff ff 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.143 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff87676240 task.stack: ffffffff87600000
RIP: 0010:__list_del_entry_valid+0x33/0xf5 lib/list_debug.c:43
RSP: 0018:ffff8880aee075c8 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff8880911b1cf8 RCX: 0000000000000000
RDX: ffff8880911b1cf8 RSI: ffff8880911b1d90 RDI: ffff8880911b1d00
RBP: ffff8880aee075e0 R08: 0000000000000000 R09: ffffffff87676ba8
R10: ffffffff87676b88 R11: ffffffff87676240 R12: ffff8880911b1d90
R13: ffff8880911b1b00 R14: ffff8880911b1cf8 R15: ffff8880911b1d80
FS:  0000000000000000(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f32e9953000 CR3: 0000000059643000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __list_del_entry include/linux/list.h:117 [inline]
 list_move_tail include/linux/list.h:182 [inline]
 hhf_dequeue+0x57f/0xa60 net/sched/sch_hhf.c:438
 dequeue_skb net/sched/sch_generic.c:148 [inline]
 qdisc_restart net/sched/sch_generic.c:241 [inline]
 __qdisc_run+0x2b8/0xe00 net/sched/sch_generic.c:257
 __dev_xmit_skb net/core/dev.c:3235 [inline]
 __dev_queue_xmit+0x1571/0x25e0 net/core/dev.c:3493
 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558
 neigh_resolve_output net/core/neighbour.c:1364 [inline]
 neigh_resolve_output+0x4d8/0x870 net/core/neighbour.c:1344
 neigh_output include/net/neighbour.h:500 [inline]
 ip6_finish_output2+0x9ab/0x21b0 net/ipv6/ip6_output.c:120
 ip6_finish_output+0x4f4/0xb50 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:239 [inline]
 ip6_output+0x20f/0x6d0 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:462 [inline]
 NF_HOOK include/linux/netfilter.h:250 [inline]
 ndisc_send_skb+0xb56/0x11e0 net/ipv6/ndisc.c:483
 ndisc_send_rs+0x129/0x680 net/ipv6/ndisc.c:677
 addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3757
 call_timer_fn+0x161/0x670 kernel/time/timer.c:1279
 expire_timers kernel/time/timer.c:1318 [inline]
 __run_timers kernel/time/timer.c:1634 [inline]
 __run_timers kernel/time/timer.c:1602 [inline]
 run_timer_softirq+0x5b4/0x1570 kernel/time/timer.c:1647
 __do_softirq+0x244/0x9a0 kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x160/0x1b0 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:648 [inline]
 smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102
 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792
 </IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
RSP: 0018:ffffffff87607de8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0ee2a84 RBX: ffffffff87676240 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff87676abc
RBP: ffffffff87607e10 R08: 1ffffffff104a601 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff87715410
R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff87676240
 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:557
 default_idle_call+0x36/0x90 kernel/sched/idle.c:98
 cpuidle_idle_call kernel/sched/idle.c:156 [inline]
 do_idle+0x262/0x3d0 kernel/sched/idle.c:246
 cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:351
 rest_init+0x1d9/0x1e2 init/main.c:435
 start_kernel+0x6df/0x6fd init/main.c:709
 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:381
 x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:362
 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
Code: ff df 55 48 89 e5 41 56 49 89 fe 48 83 c7 08 48 89 fa 41 55 48 c1 ea 03 41 54 80 3c 02 00 0f 85 a1 00 00 00 4c 89 f2 4d 8b 66 08 <48> b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 9d 

Crashes (3):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-14 2019/09/11 20:53 linux-4.14.y e2cd24b62938 f4e53c10 .config log report
ci2-linux-4-14 2019/09/09 09:59 linux-4.14.y 414510bc00a5 a60cb4cd .config log report
ci2-linux-4-14 2019/09/09 05:14 linux-4.14.y 414510bc00a5 a60cb4cd .config log report