syzbot


INFO: rcu detected stall in do_signal
Status: auto-closed as invalid on 2019/10/23 10:40
Reported-by: syzbot+3b7d87db90bbfce1eba5@syzkaller.appspotmail.com
First crash: 1126d, last: 1126d
similar bugs (9):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: rcu detected stall in do_signal (4) 3 137d 179d 0/1 auto-closed as invalid on 2022/05/09 06:50
upstream INFO: rcu detected stall in do_signal (3) 2 905d 905d 0/22 closed as invalid on 2019/12/04 14:04
linux-4.19 INFO: rcu detected stall in do_signal (2) 1 865d 865d 0/1 auto-closed as invalid on 2020/05/11 22:29
upstream INFO: rcu detected stall in do_signal 2 1304d 1323d 0/22 auto-closed as invalid on 2019/04/28 15:41
linux-4.14 INFO: rcu detected stall in do_signal (2) 1 449d 449d 0/1 auto-closed as invalid on 2021/07/02 05:05
linux-4.14 INFO: rcu detected stall in do_signal 7 576d 890d 0/1 auto-closed as invalid on 2021/02/24 19:41
linux-4.19 INFO: rcu detected stall in do_signal (3) 6 413d 714d 0/1 auto-closed as invalid on 2021/08/06 21:07
upstream INFO: rcu detected stall in do_signal (2) 3 909d 909d 0/22 closed as invalid on 2019/11/29 14:24
upstream INFO: rcu detected stall in do_signal (4) C done error 30 659d 885d 0/22 closed as invalid on 2022/02/08 10:44

Sample crash report:
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10715 jiffies, g=465505, q=3423)
rcu: All QSes seen, last rcu_preempt kthread activity 3286 (4295277383-4295274097), jiffies_till_next_fqs=1, root ->qsmask 0x0
syz-executor.4  R  running task    28760  3790   7792 0x80000000
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:5297 [inline]
 sched_show_task.cold+0x292/0x30b kernel/sched/core.c:5272
 print_other_cpu_stall kernel/rcu/tree.c:1430 [inline]
 check_cpu_stall kernel/rcu/tree.c:1557 [inline]
 __rcu_pending kernel/rcu/tree.c:3293 [inline]
 rcu_pending kernel/rcu/tree.c:3336 [inline]
 rcu_check_callbacks.cold+0xaa1/0xd93 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+0x33e/0xde0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1029 [inline]
 smp_apic_timer_interrupt+0x120/0x570 arch/x86/kernel/apic/apic.c:1054
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:867
 </IRQ>
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x50 kernel/kcov.c:100
Code: 87 ea ff 48 c7 05 84 23 cb 08 00 00 00 00 e9 ca e9 ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 48 8b 75 08 <65> 48 8b 04 25 40 ee 01 00 65 8b 15 a8 a8 96 7e 81 e2 00 01 1f 00
RSP: 0018:ffff88805d9df7e0 EFLAGS: 00000213 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff819afca4
RDX: 01fffc0000000000 RSI: ffffffff819afcb7 RDI: 0000000000000007
RBP: ffff88805d9df7e0 R08: ffff88809c6782c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffea0001957b40
R13: ffffea0001957b40 R14: ffff88807f02bae8 R15: 000000000000015b
 __read_once_size include/linux/compiler.h:193 [inline]
 compound_head include/linux/page-flags.h:142 [inline]
 PageSwapBacked include/linux/page-flags.h:295 [inline]
 PageSwapCache include/linux/page-flags.h:340 [inline]
 free_swap_cache mm/swap_state.c:290 [inline]
 free_pages_and_swap_cache+0x127/0x3d0 mm/swap_state.c:318
 tlb_flush_mmu_free+0x7e/0x150 mm/memory.c:249
 tlb_flush_mmu mm/memory.c:258 [inline]
 arch_tlb_finish_mmu+0x225/0x520 mm/memory.c:273
 tlb_finish_mmu+0x9e/0x100 mm/memory.c:432
 exit_mmap+0x2e2/0x530 mm/mmap.c:3094
 __mmput kernel/fork.c:1001 [inline]
 mmput+0x15f/0x4c0 kernel/fork.c:1022
 exit_mm kernel/exit.c:546 [inline]
 do_exit+0x838/0x2fa0 kernel/exit.c:863
 do_group_exit+0x135/0x370 kernel/exit.c:979
 get_signal+0x399/0x1d50 kernel/signal.c:2572
 do_signal+0x95/0x1950 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458da9
Code: Bad RIP value.
RSP: 002b:00007f38aea26cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000073bf08 RCX: 0000000000458da9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000073bf08
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000073bf0c
R13: 00007ffea609a56f R14: 00007f38aea279c0 R15: 000000000073bf0c
rcu: rcu_preempt kthread starved for 3286 jiffies! g465505 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29008    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2826 [inline]
 __schedule+0x813/0x1d00 kernel/sched/core.c:3474
 schedule+0x92/0x1c0 kernel/sched/core.c:3518
 schedule_timeout+0x4db/0xfd0 kernel/time/timer.c:1804
 rcu_gp_kthread+0xd5c/0x2190 kernel/rcu/tree.c:2202
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
net_ratelimit: 2 callbacks suppressed
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-19 2019/04/26 10:39 linux-4.19.y c98875d930e9 b617407b .config log report