syzbot


INFO: rcu detected stall in sys_close

Status: closed as invalid on 2022/02/08 10:10
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 332d, last: 332d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_close (3) 1 94d 94d 0/24 auto-obsoleted due to no activity on 2022/10/25 14:50
upstream INFO: rcu detected stall in sys_close (2) 3 190d 240d 0/24 auto-closed as invalid on 2022/08/21 03:13

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=6ed/1/0x4000000000000000 softirq=63462/63463 fqs=2512 
	(detected by 1, t=10502 jiffies, g=102737, q=1651)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 20546 Comm: syz-executor.0 Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:strlen+0x37/0x60 lib/string.c:487
Code: 00 00 fc ff df 48 89 f8 66 2e 0f 1f 84 00 00 00 00 00 90 48 89 c3 48 c1 e8 03 42 0f b6 04 38 84 c0 75 0b 48 8d 43 01 80 3b 00 <75> e7 eb 13 89 d9 80 e1 07 38 c1 7c ec 48 89 df e8 74 92 89 fd eb
RSP: 0018:ffffc90000007960 EFLAGS: 00000002
RAX: ffffffff8b9ec001 RBX: ffffffff8b9ec000 RCX: 0000000000007a03
RDX: 0000000000000000 RSI: ffff8880231a7300 RDI: ffffffff8b9ec000
RBP: ffffc90000007a98 R08: 0000000000000000 R09: 0000000000000001
R10: fffffbfff1bfd58e R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8c9ec5c0 R14: ffffffff8b9ec000 R15: dffffc0000000000
FS:  00005555555fc400(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f190c687090 CR3: 000000003487d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 trace_event_get_offsets_lock_acquire include/trace/events/lock.h:13 [inline]
 perf_trace_lock_acquire+0x113/0x4a0 include/trace/events/lock.h:13
 trace_lock_acquire+0x161/0x190 include/trace/events/lock.h:13
 lock_acquire+0xa5/0x4d0 kernel/locking/lockdep.c:5608
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:349 [inline]
 advance_sched+0x4c/0x930 net/sched/sch_taprio.c:714
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:lock_is_held_type+0x143/0x190
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc9000440fc18 EFLAGS: 00000206
RAX: 92114e2fe1976900 RBX: 0000000000000000 RCX: 0000000080000002
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffc9000440fce8 R08: dffffc0000000000 R09: fffffbfff1bfd58e
R10: fffffbfff1bfd58e R11: 0000000000000000 R12: 0000000000000246
R13: ffff8880229cd700 R14: 00000000ffffffff R15: ffffffff8cb1dd60
 lock_is_held include/linux/lockdep.h:283 [inline]
 rcu_read_lock_sched_held+0x89/0x130 kernel/rcu/update.c:125
 trace_lock_acquire+0x59/0x190 include/trace/events/lock.h:13
 lock_acquire+0xa5/0x4d0 kernel/locking/lockdep.c:5608
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:349 [inline]
 pick_file+0x2f/0x1f0 fs/file.c:614
 close_fd+0x45/0x70 fs/file.c:638
 __do_sys_close fs/open.c:1341 [inline]
 __se_sys_close fs/open.c:1339 [inline]
 __x64_sys_close+0x34/0x90 fs/open.c:1339
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f190c525adb
Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44
RSP: 002b:00007fff16d3a030 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 000000000000001d RCX: 00007f190c525adb
RDX: ffffffffffffffbc RSI: ffffffffffffffff RDI: 000000000000001c
RBP: 00007f190c687960 R08: 0000000000000000 R09: 00007f190c68a608
R10: 00007fff16d3a130 R11: 0000000000000293 R12: 00000000000d8fed
R13: 00007fff16d3a130 R14: 00007f190c685f60 R15: 0000000000000032
 </TASK>
rcu: rcu_preempt kthread starved for 5475 jiffies! g102737 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:26576 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xb72/0x1460 kernel/sched/core.c:6253
 schedule+0x12b/0x1f0 kernel/sched/core.c:6326
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1881
 rcu_gp_fqs_loop+0x1fd/0x770 kernel/rcu/tree.c:1955
 rcu_gp_kthread+0xa5/0x350 kernel/rcu/tree.c:2128
 kthread+0x468/0x490 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 1
CPU: 1 PID: 19612 Comm: syz-executor.0 Not tainted 5.16.0-rc7-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:88 [inline]
 dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_check_gp_kthread_starvation+0x1ff/0x270 kernel/rcu/tree_stall.h:481
 print_other_cpu_stall kernel/rcu/tree_stall.h:586 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:729 [inline]
 rcu_pending kernel/rcu/tree.c:3878 [inline]
 rcu_sched_clock_irq+0x23d5/0x2bc0 kernel/rcu/tree.c:2597
 update_process_times+0x197/0x200 kernel/time/timer.c:1785
 tick_sched_handle kernel/time/tick-sched.c:226 [inline]
 tick_sched_timer+0x27d/0x420 kernel/time/tick-sched.c:1428
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0xbb2/0xda0 kernel/smp.c:969
Code: 83 e6 01 31 ff e8 ee b1 0b 00 41 83 e7 01 49 bf 00 00 00 00 00 fc ff df 75 0e e8 c9 ad 0b 00 eb 4c 0f 1f 80 00 00 00 00 f3 90 <42> 0f b6 04 3b 84 c0 75 11 41 f7 45 00 01 00 00 00 74 2b e8 a6 ad
RSP: 0018:ffffc9000b7a7380 EFLAGS: 00000293
RAX: ffffffff8178d06a RBX: 1ffff1101734831d RCX: ffff888018f9ba00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000b7a74c0 R08: ffffffff8178d032 R09: ffffffff8442f410
R10: 0000000000000009 R11: ffff888018f9ba00 R12: 0000000000000000
R13: ffff8880b9a418e8 R14: ffff8880b9b3a640 R15: dffffc0000000000
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1135
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1112 [inline]
 text_poke_bp_batch+0x310/0x940 arch/x86/kernel/alternative.c:1297
 text_poke_flush arch/x86/kernel/alternative.c:1451 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1458
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 static_key_disable_cpuslocked+0xcc/0x1b0 kernel/jump_label.c:207
 static_key_disable+0x16/0x20 kernel/jump_label.c:215
 tracepoint_remove_func kernel/tracepoint.c:417 [inline]
 tracepoint_probe_unregister+0x730/0x9c0 kernel/tracepoint.c:551
 trace_event_reg+0x215/0x250
 perf_trace_event_unreg+0xaf/0x220 kernel/trace/trace_event_perf.c:162
 perf_trace_destroy+0x93/0xb0 kernel/trace/trace_event_perf.c:243
 _free_event+0x874/0xe50 kernel/events/core.c:4982
 put_event kernel/events/core.c:5076 [inline]
 perf_event_release_kernel+0x86f/0x900 kernel/events/core.c:5191
 perf_release+0x37/0x40 kernel/events/core.c:5201
 __fput+0x3fc/0x870 fs/file_table.c:280
 task_work_run+0x146/0x1c0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0x705/0x2340 kernel/exit.c:832
 do_group_exit+0x168/0x2d0 kernel/exit.c:929
 get_signal+0x1740/0x2120 kernel/signal.c:2852
 arch_do_signal_or_restart+0x9c/0x730 arch/x86/kernel/signal.c:868
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x191/0x220 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300
 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f190c572e99
Code: Unable to access opcode bytes at RIP 0x7f190c572e6f.
RSP: 002b:00007f190aee8168 EFLAGS: 00000246 ORIG_RAX: 0000000000000129
RAX: 0000000000000000 RBX: 00007f190c685f60 RCX: 00007f190c572e99
RDX: 0000000000000016 RSI: 0000000000000b85 RDI: 0000000000000b85
RBP: 00007f190c5ccff1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff16d39fcf R14: 00007f190aee8300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess), 4 bytes skipped:
   0:	df 48 89             	fisttps -0x77(%rax)
   3:	f8                   	clc
   4:	66 2e 0f 1f 84 00 00 	nopw   %cs:0x0(%rax,%rax,1)
   b:	00 00 00
   e:	90                   	nop
   f:	48 89 c3             	mov    %rax,%rbx
  12:	48 c1 e8 03          	shr    $0x3,%rax
  16:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax
  1b:	84 c0                	test   %al,%al
  1d:	75 0b                	jne    0x2a
  1f:	48 8d 43 01          	lea    0x1(%rbx),%rax
  23:	80 3b 00             	cmpb   $0x0,(%rbx)
* 26:	75 e7                	jne    0xf <-- trapping instruction
  28:	eb 13                	jmp    0x3d
  2a:	89 d9                	mov    %ebx,%ecx
  2c:	80 e1 07             	and    $0x7,%cl
  2f:	38 c1                	cmp    %al,%cl
  31:	7c ec                	jl     0x1f
  33:	48 89 df             	mov    %rbx,%rdi
  36:	e8 74 92 89 fd       	callq  0xfd8992af
  3b:	eb                   	.byte 0xeb

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2021/12/31 16:29 upstream 4f3d93c6eaff 36bd2e48 .config log report info INFO: rcu detected stall in sys_close
* Struck through repros no longer work on HEAD.