INFO: rcu detected stall in mld_ifc_timer_expire
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syzbot
Sep 6, 2019, 11:00:07 PM9/6/19
to syzkaller...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 0fed55c2 Linux 4.19.70
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1786d776600000
kernel config: https://syzkaller.appspot.com/x/.config?x=2964bf2f89c3f203
dashboard link: https://syzkaller.appspot.com/bug?extid=6116c11e11fcb233ca40
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1550183a600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142d185e600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+6116c1...@syzkaller.appspotmail.com
IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10499 ticks this GP) idle=56a/0/0x3 softirq=10276/10276 fqs=2
rcu: (t=10501 jiffies g=5121 q=121)
rcu: rcu_preempt kthread starved for 10498 jiffies! g5121 f0x0
RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt I29424 10 2 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x866/0x1dc0 kernel/sched/core.c:3474
schedule+0x92/0x1c0 kernel/sched/core.c:3518
schedule_timeout+0x4db/0xfc0 kernel/time/timer.c:1804
rcu_gp_kthread+0xd5c/0x2190 kernel/rcu/tree.c:2202
kthread+0x354/0x420 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.19.70 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x189/0x1d5 kernel/rcu/tree.c:1340
print_cpu_stall kernel/rcu/tree.c:1478 [inline]
check_cpu_stall kernel/rcu/tree.c:1550 [inline]
__rcu_pending kernel/rcu/tree.c:3293 [inline]
rcu_pending kernel/rcu/tree.c:3336 [inline]
rcu_check_callbacks.cold+0x5e3/0xd90 kernel/rcu/tree.c:2682
update_process_times+0x32/0x80 kernel/time/timer.c:1636
tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:164
tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1274
__run_hrtimer kernel/time/hrtimer.c:1398 [inline]
__hrtimer_run_queues+0x33b/0xdc0 kernel/time/hrtimer.c:1460
hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1518
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1092
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
RIP: 0010:__list_del_entry_valid+0x89/0xf5 lib/list_debug.c:51
Code: 00 00 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 e2 00 00 00 48 b8
00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00 <75> 53 49 8b 14
24 4c 39 f2 0f 85 99 00 00 00 49 8d 7d 08 48 b8 00
RSP: 0018:ffff8880ae907560 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffff888095ed8778 RCX: ffffffff858e8489
RDX: 1ffff11012bdb102 RSI: ffffffff858e893b RDI: ffff888095ed8780
RBP: ffff8880ae907578 R08: ffff8880aa2703c0 R09: 0000000000000005
R10: ffff8880aa270d08 R11: 00000000baba441b R12: ffff888095ed8810
R13: ffff888095ed8810 R14: ffff888095ed8778 R15: 0000000000000000
__list_del_entry include/linux/list.h:117 [inline]
list_move_tail include/linux/list.h:182 [inline]
hhf_dequeue+0x5aa/0xa00 net/sched/sch_hhf.c:438
dequeue_skb net/sched/sch_generic.c:277 [inline]
qdisc_restart net/sched/sch_generic.c:380 [inline]
__qdisc_run+0x1e7/0x1960 net/sched/sch_generic.c:398
__dev_xmit_skb net/core/dev.c:3501 [inline]
__dev_queue_xmit+0x165c/0x2fe0 net/core/dev.c:3811
dev_queue_xmit+0x18/0x20 net/core/dev.c:3876
neigh_resolve_output net/core/neighbour.c:1369 [inline]
neigh_resolve_output+0x5b7/0x980 net/core/neighbour.c:1349
neigh_output include/net/neighbour.h:501 [inline]
ip6_finish_output2+0xb7f/0x2550 net/ipv6/ip6_output.c:120
ip6_finish_output+0x574/0xbe0 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:278 [inline]
ip6_output+0x235/0x7c0 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:447 [inline]
NF_HOOK include/linux/netfilter.h:289 [inline]
NF_HOOK include/linux/netfilter.h:283 [inline]
mld_sendpack+0x9d3/0xeb0 net/ipv6/mcast.c:1683
mld_send_cr net/ipv6/mcast.c:1979 [inline]
mld_ifc_timer_expire+0x449/0x8a0 net/ipv6/mcast.c:2478
call_timer_fn+0x18d/0x720 kernel/time/timer.c:1326
expire_timers kernel/time/timer.c:1363 [inline]
__run_timers kernel/time/timer.c:1682 [inline]
__run_timers kernel/time/timer.c:1650 [inline]
run_timer_softirq+0x652/0x1700 kernel/time/timer.c:1695
__do_softirq+0x25c/0x921 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
</IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: ff ff 48 89 df e8 82 1b ae fa eb 82 e9 07 00 00 00 0f 00 2d a4 fc 53
00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 94 fc 53 00 fb f4 <c3> 90 55 48 89
e5 41 57 41 56 41 55 41 54 53 e8 ce fd 65 fa e8 39
RSP: 0018:ffff8880aa27fd00 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff10e48c4 RBX: ffff8880aa2703c0 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff8880aa270c3c
RBP: ffff8880aa27fd30 R08: ffff8880aa2703c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff88724610 R14: 0000000000000001 R15: 0000000000000000
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:556
default_idle_call+0x36/0x90 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x377/0x560 kernel/sched/idle.c:262
cpu_startup_entry+0xc8/0xe0 kernel/sched/idle.c:368
start_secondary+0x3e8/0x5b0 arch/x86/kernel/smpboot.c:271
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot found the following crash on:
HEAD commit: 0fed55c2 Linux 4.19.70
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1786d776600000
kernel config: https://syzkaller.appspot.com/x/.config?x=2964bf2f89c3f203
dashboard link: https://syzkaller.appspot.com/bug?extid=6116c11e11fcb233ca40
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1550183a600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142d185e600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+6116c1...@syzkaller.appspotmail.com
IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10499 ticks this GP) idle=56a/0/0x3 softirq=10276/10276 fqs=2
rcu: (t=10501 jiffies g=5121 q=121)
rcu: rcu_preempt kthread starved for 10498 jiffies! g5121 f0x0
RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt I29424 10 2 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x866/0x1dc0 kernel/sched/core.c:3474
schedule+0x92/0x1c0 kernel/sched/core.c:3518
schedule_timeout+0x4db/0xfc0 kernel/time/timer.c:1804
rcu_gp_kthread+0xd5c/0x2190 kernel/rcu/tree.c:2202
kthread+0x354/0x420 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.19.70 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x189/0x1d5 kernel/rcu/tree.c:1340
print_cpu_stall kernel/rcu/tree.c:1478 [inline]
check_cpu_stall kernel/rcu/tree.c:1550 [inline]
__rcu_pending kernel/rcu/tree.c:3293 [inline]
rcu_pending kernel/rcu/tree.c:3336 [inline]
rcu_check_callbacks.cold+0x5e3/0xd90 kernel/rcu/tree.c:2682
update_process_times+0x32/0x80 kernel/time/timer.c:1636
tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:164
tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1274
__run_hrtimer kernel/time/hrtimer.c:1398 [inline]
__hrtimer_run_queues+0x33b/0xdc0 kernel/time/hrtimer.c:1460
hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1518
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1092
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
RIP: 0010:__list_del_entry_valid+0x89/0xf5 lib/list_debug.c:51
Code: 00 00 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 e2 00 00 00 48 b8
00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00 <75> 53 49 8b 14
24 4c 39 f2 0f 85 99 00 00 00 49 8d 7d 08 48 b8 00
RSP: 0018:ffff8880ae907560 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffff888095ed8778 RCX: ffffffff858e8489
RDX: 1ffff11012bdb102 RSI: ffffffff858e893b RDI: ffff888095ed8780
RBP: ffff8880ae907578 R08: ffff8880aa2703c0 R09: 0000000000000005
R10: ffff8880aa270d08 R11: 00000000baba441b R12: ffff888095ed8810
R13: ffff888095ed8810 R14: ffff888095ed8778 R15: 0000000000000000
__list_del_entry include/linux/list.h:117 [inline]
list_move_tail include/linux/list.h:182 [inline]
hhf_dequeue+0x5aa/0xa00 net/sched/sch_hhf.c:438
dequeue_skb net/sched/sch_generic.c:277 [inline]
qdisc_restart net/sched/sch_generic.c:380 [inline]
__qdisc_run+0x1e7/0x1960 net/sched/sch_generic.c:398
__dev_xmit_skb net/core/dev.c:3501 [inline]
__dev_queue_xmit+0x165c/0x2fe0 net/core/dev.c:3811
dev_queue_xmit+0x18/0x20 net/core/dev.c:3876
neigh_resolve_output net/core/neighbour.c:1369 [inline]
neigh_resolve_output+0x5b7/0x980 net/core/neighbour.c:1349
neigh_output include/net/neighbour.h:501 [inline]
ip6_finish_output2+0xb7f/0x2550 net/ipv6/ip6_output.c:120
ip6_finish_output+0x574/0xbe0 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:278 [inline]
ip6_output+0x235/0x7c0 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:447 [inline]
NF_HOOK include/linux/netfilter.h:289 [inline]
NF_HOOK include/linux/netfilter.h:283 [inline]
mld_sendpack+0x9d3/0xeb0 net/ipv6/mcast.c:1683
mld_send_cr net/ipv6/mcast.c:1979 [inline]
mld_ifc_timer_expire+0x449/0x8a0 net/ipv6/mcast.c:2478
call_timer_fn+0x18d/0x720 kernel/time/timer.c:1326
expire_timers kernel/time/timer.c:1363 [inline]
__run_timers kernel/time/timer.c:1682 [inline]
__run_timers kernel/time/timer.c:1650 [inline]
run_timer_softirq+0x652/0x1700 kernel/time/timer.c:1695
__do_softirq+0x25c/0x921 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
</IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: ff ff 48 89 df e8 82 1b ae fa eb 82 e9 07 00 00 00 0f 00 2d a4 fc 53
00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 94 fc 53 00 fb f4 <c3> 90 55 48 89
e5 41 57 41 56 41 55 41 54 53 e8 ce fd 65 fa e8 39
RSP: 0018:ffff8880aa27fd00 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff10e48c4 RBX: ffff8880aa2703c0 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff8880aa270c3c
RBP: ffff8880aa27fd30 R08: ffff8880aa2703c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff88724610 R14: 0000000000000001 R15: 0000000000000000
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:556
default_idle_call+0x36/0x90 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x377/0x560 kernel/sched/idle.c:262
cpu_startup_entry+0xc8/0xe0 kernel/sched/idle.c:368
start_secondary+0x3e8/0x5b0 arch/x86/kernel/smpboot.c:271
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot
Sep 7, 2019, 4:50:08 AM9/7/19
to syzkaller...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 414510bc Linux 4.14.142
syzbot found the following crash on:
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=10743001600000
kernel config: https://syzkaller.appspot.com/x/.config?x=9aa0b2ccd827f416
dashboard link: https://syzkaller.appspot.com/bug?extid=42e1254b6c2097b925ed
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=172a2ba9600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10dbd1fa600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
INFO: rcu_preempt self-detected stall on CPU
1-...: (10500 ticks this GP) idle=0de/140000000000002/0
softirq=14531/14531 fqs=0
(t=10500 jiffies g=1061 c=1060 q=243)
rcu_preempt kthread starved for 10500 jiffies! g1061 c1060 f0x0
RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=1
rcu_preempt I29824 8 2 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
schedule+0x92/0x1c0 kernel/sched/core.c:3427
schedule_timeout+0x43e/0xe10 kernel/time/timer.c:1744
rcu_gp_kthread+0xbf4/0x1ec0 kernel/rcu/tree.c:2255
kthread+0x319/0x430 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
NMI backtrace for cpu 1
CPU: 1 PID: 6921 Comm: syz-executor299 Not tainted 4.14.142 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:17 [inline]
Google 01/01/2011
Call Trace:
<IRQ>
dump_stack+0x138/0x197 lib/dump_stack.c:53
nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x141/0x189 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline]
rcu_dump_cpu_stacks+0x186/0x1d2 kernel/rcu/tree.c:1396
print_cpu_stall kernel/rcu/tree.c:1542 [inline]
check_cpu_stall kernel/rcu/tree.c:1610 [inline]
__rcu_pending kernel/rcu/tree.c:3390 [inline]
rcu_pending kernel/rcu/tree.c:3452 [inline]
rcu_check_callbacks.cold+0x43d/0xd0a kernel/rcu/tree.c:2792
update_process_times+0x31/0x70 kernel/time/timer.c:1588
tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:161
tick_sched_timer+0x43/0x130 kernel/time/tick-sched.c:1219
__run_hrtimer kernel/time/hrtimer.c:1220 [inline]
__hrtimer_run_queues+0x270/0xbc0 kernel/time/hrtimer.c:1284
hrtimer_interrupt+0x1d8/0x5d0 kernel/time/hrtimer.c:1318
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline]
smp_apic_timer_interrupt+0x11c/0x5e0 arch/x86/kernel/apic/apic.c:1100
apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792
RIP: 0010:hhf_dequeue+0x51a/0xa60 net/sched/sch_hhf.c:435
RSP: 0018:ffff8880aef071c0 EFLAGS: 00000a07 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000000 RBX: ffff888077f521f8 RCX: 0000000000000000
RDX: 1ffff1100efea455 RSI: ffff888077f52290 RDI: ffff888077f522ac
RBP: ffff8880aef07210 R08: 0000000000000000 R09: ffff888092112bf8
R10: ffff888092112bd8 R11: ffff888092112240 R12: dffffc0000000000
R13: ffff888077f52000 R14: 0000000000000001 R15: ffff888077f52280
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
br_dev_queue_push_xmit+0x367/0x530 net/bridge/br_forward.c:55
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
br_forward_finish+0xbc/0x320 net/bridge/br_forward.c:67
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
__br_forward+0x560/0x9c0 net/bridge/br_forward.c:111
deliver_clone+0x61/0xc0 net/bridge/br_forward.c:127
maybe_deliver net/bridge/br_forward.c:168 [inline]
maybe_deliver net/bridge/br_forward.c:156 [inline]
br_flood+0x3c8/0x530 net/bridge/br_forward.c:210
br_dev_xmit+0x9a4/0xd40 net/bridge/br_device.c:83
__netdev_start_xmit include/linux/netdevice.h:4033 [inline]
netdev_start_xmit include/linux/netdevice.h:4042 [inline]
xmit_one net/core/dev.c:3009 [inline]
dev_hard_start_xmit+0x18c/0x8b0 net/core/dev.c:3025
__dev_queue_xmit+0x1d95/0x25e0 net/core/dev.c:3525
dev_queue_xmit+0x18/0x20 net/core/dev.c:3558
neigh_hh_output include/net/neighbour.h:490 [inline]
neigh_output include/net/neighbour.h:498 [inline]
ip6_finish_output2+0x10bd/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]
NF_HOOK include/linux/netfilter.h:244 [inline]
mld_sendpack+0x8d1/0xd60 net/ipv6/mcast.c:1659
mld_send_cr net/ipv6/mcast.c:1955 [inline]
mld_ifc_timer_expire+0x3b6/0x7b0 net/ipv6/mcast.c:2454
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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169
[inline]
RIP: 0010:_raw_spin_unlock_irq+0x54/0x90 kernel/locking/spinlock.c:200
RSP: 0018:ffff88808d8afec8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0ee2a83 RBX: ffff888092112240 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff888092112abc
RBP: ffff88808d8afed0 R08: ffff888092112240 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880aef2c500
R13: ffff8880a9d1c340 R14: ffff888077848040 R15: ffff8880aef2ce58
finish_lock_switch kernel/sched/sched.h:1350 [inline]
finish_task_switch+0x178/0x650 kernel/sched/core.c:2674
schedule_tail+0xe/0x120 kernel/sched/core.c:2755
ret_from_fork+0x8/0x30 arch/x86/entry/entry_64.S:389
RIP: 0033:0x440cca
RSP: 002b:00007ffe0ddbb510 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000440cca
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffe0ddbb530 R08: 0000000000000001 R09: 0000000001a3a880
R10: 0000000001a3ab50 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000004032e0 R14: 0000000000000000 R15: 0000000000000000
INFO: rcu_sched detected stalls on CPUs/tasks:
1-...: (10502 ticks this GP) idle=0de/140000000000001/0
softirq=14531/14531 fqs=0
(detected by 0, t=10567 jiffies, g=756, c=755, q=11)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6921 Comm: syz-executor299 Not tainted 4.14.142 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
task: ffff888092112240 task.stack: ffff88808d8a8000
Google 01/01/2011
RIP: 0010:__list_del_entry_valid+0xa6/0xf5 lib/list_debug.c:54
RSP: 0018:ffff8880aef07198 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff888077f521f8 RCX: 0000000000000000
RDX: ffff888077f521f8 RSI: ffff888077f52290 RDI: ffff888077f52298
RBP: ffff8880aef071b0 R08: 0000000000000000 R09: ffff888092112bf8
R10: ffff888092112bd8 R11: ffff888092112240 R12: ffff888077f52290
R13: ffff888077f52290 R14: ffff888077f521f8 R15: ffff888077f52280
FS: 0000000001a3a880(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006dab10 CR3: 00000000a9679000 CR4: 00000000001406e0
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
list_move_tail include/linux/list.h:182 [inline]
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
br_dev_queue_push_xmit+0x367/0x530 net/bridge/br_forward.c:55
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
br_forward_finish+0xbc/0x320 net/bridge/br_forward.c:67
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
__br_forward+0x560/0x9c0 net/bridge/br_forward.c:111
deliver_clone+0x61/0xc0 net/bridge/br_forward.c:127
maybe_deliver net/bridge/br_forward.c:168 [inline]
maybe_deliver net/bridge/br_forward.c:156 [inline]
br_flood+0x3c8/0x530 net/bridge/br_forward.c:210
br_dev_xmit+0x9a4/0xd40 net/bridge/br_device.c:83
__netdev_start_xmit include/linux/netdevice.h:4033 [inline]
netdev_start_xmit include/linux/netdevice.h:4042 [inline]
xmit_one net/core/dev.c:3009 [inline]
dev_hard_start_xmit+0x18c/0x8b0 net/core/dev.c:3025
__dev_queue_xmit+0x1d95/0x25e0 net/core/dev.c:3525
dev_queue_xmit+0x18/0x20 net/core/dev.c:3558
neigh_hh_output include/net/neighbour.h:490 [inline]
neigh_output include/net/neighbour.h:498 [inline]
ip6_finish_output2+0x10bd/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]
NF_HOOK include/linux/netfilter.h:244 [inline]
mld_sendpack+0x8d1/0xd60 net/ipv6/mcast.c:1659
mld_send_cr net/ipv6/mcast.c:1955 [inline]
mld_ifc_timer_expire+0x3b6/0x7b0 net/ipv6/mcast.c:2454
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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169
[inline]
RIP: 0010:_raw_spin_unlock_irq+0x54/0x90 kernel/locking/spinlock.c:200
RSP: 0018:ffff88808d8afec8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0ee2a83 RBX: ffff888092112240 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff888092112abc
RBP: ffff88808d8afed0 R08: ffff888092112240 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880aef2c500
R13: ffff8880a9d1c340 R14: ffff888077848040 R15: ffff8880aef2ce58
finish_lock_switch kernel/sched/sched.h:1350 [inline]
finish_task_switch+0x178/0x650 kernel/sched/core.c:2674
schedule_tail+0xe/0x120 kernel/sched/core.c:2755
ret_from_fork+0x8/0x30 arch/x86/entry/entry_64.S:389
RIP: 0033:0x440cca
RSP: 002b:00007ffe0ddbb510 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000440cca
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffe0ddbb530 R08: 0000000000000001 R09: 0000000001a3a880
R10: 0000000001a3ab50 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000004032e0 R14: 0000000000000000 R15: 0000000000000000
Code: fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00 75 53 49 8b 14 24 4c 39 f2
0f 85 99 00 00 00 49 8d 7d 08 48 b8 00 00 00 00 00 fc ff df <48> 89 fa 48
c1 ea 03 80 3c 02 00 75 24 49 8b 55 08 4c 39 f2 0f
rcu_sched kthread starved for 10568 jiffies! g756 c755 f0x0
RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=1
rcu_sched I29824 9 2 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
schedule+0x92/0x1c0 kernel/sched/core.c:3427
schedule_timeout+0x43e/0xe10 kernel/time/timer.c:1744
rcu_gp_kthread+0xbf4/0x1ec0 kernel/rcu/tree.c:2255
kthread+0x319/0x430 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
syzbot
Dec 6, 2019, 10:16:01 AM12/6/19
to syzkaller...@googlegroups.com
syzbot suspects this bug was fixed by commit:
commit cc243e2427cef2a5dd7367cb0e0b846503350ffe
Author: Cong Wang <xiyou.w...@gmail.com>
Date: Sun Sep 8 20:40:51 2019 +0000
sch_hhf: ensure quantum and hhf_non_hh_weight are non-zero
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1422a541e00000
start commit: 414510bc Linux 4.14.142
git tree: linux-4.14.y
#syz fix: sch_hhf: ensure quantum and hhf_non_hh_weight are non-zero
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
commit cc243e2427cef2a5dd7367cb0e0b846503350ffe
Author: Cong Wang <xiyou.w...@gmail.com>
Date: Sun Sep 8 20:40:51 2019 +0000
sch_hhf: ensure quantum and hhf_non_hh_weight are non-zero
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1422a541e00000
start commit: 414510bc Linux 4.14.142
git tree: linux-4.14.y
kernel config: https://syzkaller.appspot.com/x/.config?x=9aa0b2ccd827f416
dashboard link: https://syzkaller.appspot.com/bug?extid=42e1254b6c2097b925ed
dashboard link: https://syzkaller.appspot.com/bug?extid=42e1254b6c2097b925ed
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=172a2ba9600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10dbd1fa600000
If the result looks correct, please mark the bug fixed by replying with:
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10dbd1fa600000
#syz fix: sch_hhf: ensure quantum and hhf_non_hh_weight are non-zero
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot
Dec 7, 2019, 9:06:01 AM12/7/19
to syzkaller...@googlegroups.com
syzbot suspects this bug was fixed by commit:
commit a9e91767b921ee196ab693fa13a81b278f53ddac
Author: Cong Wang <xiyou.w...@gmail.com>
Date: Sun Sep 8 20:40:51 2019 +0000
sch_hhf: ensure quantum and hhf_non_hh_weight are non-zero
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14089c2ae00000
Date: Sun Sep 8 20:40:51 2019 +0000
sch_hhf: ensure quantum and hhf_non_hh_weight are non-zero
start commit: 0fed55c2 Linux 4.19.70
git tree: linux-4.19.y
kernel config: https://syzkaller.appspot.com/x/.config?x=2964bf2f89c3f203
dashboard link: https://syzkaller.appspot.com/bug?extid=6116c11e11fcb233ca40
dashboard link: https://syzkaller.appspot.com/bug?extid=6116c11e11fcb233ca40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1550183a600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142d185e600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142d185e600000
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