syzbot


INFO: rcu detected stall in mld_dad_timer_expire (2)

Status: closed as invalid on 2019/11/29 14:24
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 939d, last: 939d
similar bugs (3):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 INFO: rcu detected stall in mld_dad_timer_expire C done 1 1015d 1015d 1/1 fixed on 2019/12/09 13:28
upstream INFO: rcu detected stall in mld_dad_timer_expire 3 1019d 1020d 14/22 fixed on 2019/10/09 10:54
linux-4.19 INFO: rcu detected stall in mld_dad_timer_expire 1 664d 664d 0/1 auto-closed as invalid on 2020/12/29 00:26

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	3-....: (10500 ticks this GP) idle=98e/1/0x4000000000000004 softirq=6821/6822 fqs=4736 
	(t=10502 jiffies g=5773 q=2039)
NMI backtrace for cpu 3
CPU: 3 PID: 8050 Comm: syz-executor.1 Not tainted 5.4.0-syzkaller #0
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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+0x183/0x1cf kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2827 [inline]
 rcu_sched_clock_irq.cold+0x509/0xc02 kernel/rcu/tree.c:2271
 update_process_times+0x2d/0x70 kernel/time/timer.c:1726
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1310
 __run_hrtimer kernel/time/hrtimer.c:1514 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1576
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1638
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
RIP: 0010:check_memory_region+0x13/0x1a0 mm/kasan/generic.c:191
Code: 48 89 e5 e8 3f e4 c7 05 5d c3 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 48 85 f6 0f 84 34 01 00 00 48 b8 ff ff ff ff ff 7f ff ff <55> 0f b6 d2 48 39 c7 48 89 e5 41 55 41 54 53 0f 86 07 01 00 00 4c
RSP: 0018:ffff88807ed09ab0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: ffff7fffffffffff RBX: ffff88807ed38140 RCX: ffffffff81626334
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88807ed38220
RBP: ffff88807ed09ab8 R08: ffff88801391c1c0 R09: fffffbfff153779d
R10: ffff88801391caf8 R11: ffff88801391c1c0 R12: ffff88807ed38220
R13: ffff88807ed09bc0 R14: ffff88807de36cc8 R15: ffff88807de360c0
 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
 rcu_dynticks_curr_cpu_in_eqs+0x54/0xb0 kernel/rcu/tree.c:301
 rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:922
 rcu_read_lock include/linux/rcupdate.h:618 [inline]
 in6_dev_get+0x242/0x2c0 include/net/addrconf.h:354
 icmp6_dst_alloc+0x20/0x4a0 net/ipv6/route.c:3124
 mld_sendpack+0x625/0xed0 net/ipv6/mcast.c:1671
 mld_send_initial_cr.part.0+0x114/0x160 net/ipv6/mcast.c:2099
 mld_send_initial_cr net/ipv6/mcast.c:2083 [inline]
 mld_dad_timer_expire+0x42/0x230 net/ipv6/mcast.c:2118
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline]
RIP: 0010:generic_exec_single+0x33a/0x4c0 kernel/smp.c:155
Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 68 01 00 00 48 83 3d 2e 81 a9 07 00 0f 84 e0 00 00 00 e8 eb 2a 0b 00 48 89 df 57 9d <0f> 1f 44 00 00 45 31 ed e9 39 fe ff ff e8 d4 2a 0b 00 0f 0b e9 23
RSP: 0018:ffff88801a8d7a80 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff13
RAX: 0000000000040000 RBX: 0000000000000216 RCX: ffffc90008a54000
RDX: 00000000000014c1 RSI: ffffffff8169b335 RDI: 0000000000000216
RBP: ffff88801a8d7ab0 R08: 1ffffffff15377bb R09: fffffbfff15377bc
R10: fffffbfff15377bb R11: ffffffff8a9bbddf R12: 0000000000000200
R13: ffff88801a8d7b00 R14: ffff88801a8d7bd0 R15: ffffffff818bd170
 smp_call_function_single+0x17c/0x480 kernel/smp.c:308
 task_function_call+0xe9/0x180 kernel/events/core.c:114
 perf_install_in_context+0x308/0x5a0 kernel/events/core.c:2746
 __do_sys_perf_event_open+0x1cbc/0x2c70 kernel/events/core.c:11543
 __se_sys_perf_event_open kernel/events/core.c:11151 [inline]
 __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:11151
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a759
Code: bd b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8fbfaf2c88 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 000000000071bf00 RCX: 000000000045a759
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 000000002001d000
RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f8fbfaf36d4
R13: 00000000004aec17 R14: 00000000006f1cb0 R15: 00000000ffffffff

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-qemu-upstream 2019/11/29 10:31 upstream 81b6b96475ac 4f7e1d0f .config log report
ci-qemu-upstream 2019/11/29 10:14 upstream 81b6b96475ac 4f7e1d0f .config log report