syzbot


INFO: rcu detected stall in sys_bpf (3)

Status: closed as invalid on 2020/01/09 08:13
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 948d, last: 948d
similar bugs (5):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_bpf (5) C unreliable 56 203d 296d 0/23 closed as invalid on 2022/02/08 10:34
upstream INFO: rcu detected stall in sys_bpf 3 1115d 1235d 0/23 auto-closed as invalid on 2019/11/23 00:18
upstream INFO: rcu detected stall in sys_bpf (2) 12 983d 985d 0/23 closed as invalid on 2019/12/04 14:14
linux-4.19 INFO: rcu detected stall in sys_bpf 3 932d 1062d 0/1 auto-closed as invalid on 2020/05/23 14:47
upstream INFO: rcu detected stall in sys_bpf (4) 3 901d 940d 0/23 auto-closed as invalid on 2020/05/24 13:03

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=026/1/0x4000000000000002 softirq=13666/13666 fqs=7 
	(t=10501 jiffies g=7001 q=424)
rcu: rcu_preempt kthread starved for 10487 jiffies! g7001 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29032    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3385 [inline]
 __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081
 schedule+0x181/0x210 kernel/sched/core.c:4155
 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895
 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline]
 rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 8598 Comm: syz-executor.0 Not tainted 5.5.0-rc5-syzkaller #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+0x1fb/0x318 lib/dump_stack.c:118
 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x15a/0x220 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+0xe25/0x1ad0 kernel/rcu/tree.c:2271
 update_process_times+0x12d/0x180 kernel/time/timer.c:1726
 tick_sched_handle kernel/time/tick-sched.c:167 [inline]
 tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:mod_memcg_page_state+0x6/0x190 include/linux/memcontrol.h:652
Code: 60 00 eb 0c e8 eb 27 2e 00 eb 05 e8 e4 27 2e 00 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 1f 44 00 00 55 48 89 e5 41 57 <41> 56 41 54 53 41 89 f6 48 89 fb e8 ba 27 2e 00 48 83 c3 38 48 89
RSP: 0018:ffffc90002297528 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff11011e7a341 RBX: ffff88808f3d1a08 RCX: 0000000000000000
RDX: ffffc90002059000 RSI: 00000000fffffffc RDI: ffffea000259ed80
RBP: ffffc90002297530 R08: 000000000003a728 R09: ffffed1013a32e89
R10: ffffed1013a32e89 R11: 0000000000000000 R12: ffff88808f3d1aa0
R13: dffffc0000000000 R14: 1ffff11011e7a354 R15: ffff88809d197438
 free_thread_stack+0x168/0x590 kernel/fork.c:280
 release_task_stack kernel/fork.c:440 [inline]
 put_task_stack+0xa3/0x130 kernel/fork.c:451
 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256
 context_switch kernel/sched/core.c:3388 [inline]
 __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081
 preempt_schedule_common kernel/sched/core.c:4236 [inline]
 preempt_schedule+0xdb/0x120 kernel/sched/core.c:4261
 ___preempt_schedule+0x16/0x18 arch/x86/entry/thunk_64.S:50
 __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock+0x3a/0x40 kernel/locking/spinlock.c:183
 spin_unlock include/linux/spinlock.h:378 [inline]
 __cond_resched_lock+0x93/0x1d0 kernel/sched/core.c:5647
 __purge_vmap_area_lazy+0x19e5/0x1ae0 mm/vmalloc.c:1327
 _vm_unmap_aliases+0x43a/0x4c0 mm/vmalloc.c:1738
 vm_unmap_aliases+0x19/0x20 mm/vmalloc.c:1761
 change_page_attr_set_clr+0x267/0x650 arch/x86/mm/pageattr.c:1709
 change_page_attr_clear arch/x86/mm/pageattr.c:1766 [inline]
 set_memory_ro+0x66/0x90 arch/x86/mm/pageattr.c:1899
 bpf_jit_binary_lock_ro include/linux/filter.h:790 [inline]
 bpf_int_jit_compile+0x8bab/0x9090 arch/x86/net/bpf_jit_comp.c:1659
 bpf_prog_select_runtime+0x79a/0xac0 kernel/bpf/core.c:1801
 bpf_prog_load kernel/bpf/syscall.c:1809 [inline]
 __do_sys_bpf+0x9b28/0xc9f0 kernel/bpf/syscall.c:3030
 __se_sys_bpf kernel/bpf/syscall.c:2989 [inline]
 __x64_sys_bpf+0x7a/0x90 kernel/bpf/syscall.c:2989
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45af49
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f32cb7e6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045af49
RDX: 0000000000000048 RSI: 000000002000e000 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f32cb7e76d4
R13: 00000000004c1697 R14: 00000000004d64c0 R15: 00000000ffffffff

Crashes (4):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2020/01/08 10:46 upstream ae6088216ce4 6738e0b3 .config log report
ci-upstream-kasan-gce-smack-root 2020/01/08 10:03 upstream ae6088216ce4 6738e0b3 .config log report
ci-upstream-kasan-gce-smack-root 2020/01/08 08:54 upstream ae6088216ce4 6738e0b3 .config log report
ci-upstream-kasan-gce-smack-root 2020/01/08 08:04 upstream ae6088216ce4 6738e0b3 .config log report