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INFO: rcu detected stall in vfs_rmdir

Status: closed as dup on 2018/04/14 07:02
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+da69f0eccf07cdcf6710@syzkaller.appspotmail.com
First crash: 2198d, last: 2137d
▶ ▼ Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
INFO: rcu detected stall in d_walk fs C 25680 2137d 2199d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
INFO: rcu detected stall in vfs_rmdir 1 (2) 2018/04/14 07:02

Sample crash report:
FAT-fs (loop1): bogus sectors per cluster 0
FAT-fs (loop1): Can't find a valid FAT filesystem
FAT-fs (loop1): Unrecognized mount option "è" or missing value
INFO: rcu_sched self-detected stall on CPU
	0-...!: (124991 ticks this GP) idle=932/1/4611686018427387906 softirq=84653/84653 fqs=1 
	 (t=125000 jiffies g=46554 c=46553 q=59)
rcu_sched kthread starved for 124996 jiffies! g46554 c46553 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
RCU grace-period kthread stack dump:
rcu_sched       R  running task    23592     9      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2859 [inline]
 __schedule+0x801/0x1e30 kernel/sched/core.c:3501
 schedule+0xef/0x430 kernel/sched/core.c:3545
 schedule_timeout+0x138/0x240 kernel/time/timer.c:1801
 rcu_gp_kthread+0x6b5/0x1940 kernel/rcu/tree.c:2231
 kthread+0x345/0x410 kernel/kthread.c:240
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
NMI backtrace for cpu 0
CPU: 0 PID: 13400 Comm: syz-executor3 Not tainted 4.17.0-rc7+ #79
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+0x1b9/0x294 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103
 nmi_trigger_cpumask_backtrace+0x151/0x192 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:156 [inline]
 rcu_dump_cpu_stacks+0x175/0x1c2 kernel/rcu/tree.c:1376
 print_cpu_stall kernel/rcu/tree.c:1525 [inline]
 check_cpu_stall.isra.61.cold.80+0x36c/0x59a kernel/rcu/tree.c:1593
 __rcu_pending kernel/rcu/tree.c:3356 [inline]
 rcu_pending kernel/rcu/tree.c:3401 [inline]
 rcu_check_callbacks+0x21b/0xad0 kernel/rcu/tree.c:2763
 update_process_times+0x2d/0x70 kernel/time/timer.c:1636
 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164
 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0x3e3/0x10a0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863
 </IRQ>
RIP: 0010:shrink_dentry_list+0xa/0x7c0 fs/dcache.c:1051
RSP: 0018:ffff8801b111fb80 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff8801b0c94040 RBX: dffffc0000000000 RCX: ffffffff81c67179
RDX: dffffc0000000000 RSI: ffffffff81c67091 RDI: ffff8801b111fc18
RBP: ffff8801b111fc78 R08: ffff8801b0c94040 R09: ffffed0039cb77d8
R10: ffffed0039cb77d8 R11: ffff8801ce5bbec3 R12: ffff8801b111fc50
R13: ffff8801b111fc10 R14: 1ffff10036223f82 R15: ffffed0036223f85
 vfs_rmdir+0x202/0x470 fs/namei.c:3850
 do_rmdir+0x523/0x610 fs/namei.c:3911
 __do_sys_rmdir fs/namei.c:3929 [inline]
 __se_sys_rmdir fs/namei.c:3927 [inline]
 __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455777
RSP: 002b:00007ffc595e2da8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777
RDX: 0000000000000000 RSI: 00007ffc595e4b50 RDI: 00007ffc595e4b50
RBP: 00007ffc595e4b50 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000006 R11: 0000000000000202 R12: 0000000000e2c940
R13: 0000000000000000 R14: 000000000000028d R15: 000000000004cf52

Crashes (180):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/06/02 18:20 upstream 4277e6b9fd44 2f93b54f .config console log report ci-upstream-kasan-gce-root
2018/06/02 08:38 upstream 0512e0134582 2f93b54f .config console log report ci-upstream-kasan-gce-root
2018/06/01 07:40 upstream dd52cb879063 2f93b54f .config console log report ci-upstream-kasan-gce-root
2018/05/29 15:54 upstream 3d661e2a2d1c e276de77 .config console log report ci-upstream-kasan-gce-root
2018/05/24 04:48 upstream bee797529d7c f48c20b8 .config console log report ci-upstream-kasan-gce-root
2018/05/23 03:51 upstream a048a07d7f45 f48c20b8 .config console log report ci-upstream-kasan-gce-root
2018/04/13 15:56 upstream 16e205cf42da 0a0c5db6 .config console log report ci-upstream-kasan-gce-root
2018/06/13 17:57 bpf-next 75d4e704fa8d 27c5f59f .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/13 07:28 bpf-next 75d4e704fa8d 27c5f59f .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/12 10:42 bpf-next 75d4e704fa8d 112eec79 .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/11 14:36 bpf-next 75d4e704fa8d ae8bdb50 .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/11 06:20 bpf-next 75d4e704fa8d 866118af .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/09 05:17 bpf-next 75d4e704fa8d 866118af .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/07 07:34 bpf-next 75d4e704fa8d e0e534c6 .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/05 13:02 bpf-next 68565a1af9f7 a316ff92 .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/05 06:23 bpf-next 34ea38ca2799 a50d873b .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/05 03:13 bpf-next 34ea38ca2799 a50d873b .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/04 23:03 bpf-next 34ea38ca2799 a50d873b .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/04 18:43 bpf-next bd3a08aaa9a3 6cbe7c26 .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/03 21:03 bpf-next 69b450789136 2f93b54f .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/03 14:34 bpf-next 25c1013e0464 2f93b54f .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/03 12:26 bpf-next 25c1013e0464 2f93b54f .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/02 15:10 bpf-next b4b21a05b8fe 2f93b54f .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/01 17:05 bpf-next bcece5dc40b9 2f93b54f .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/01 14:48 bpf-next bcece5dc40b9 2f93b54f .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/01 10:03 bpf-next bcece5dc40b9 2f93b54f .config console log report ci-upstream-bpf-next-kasan-gce
2018/06/01 05:04 bpf-next bcece5dc40b9 2f93b54f .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/31 20:23 bpf-next bcece5dc40b9 2f93b54f .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/31 16:23 bpf-next bcece5dc40b9 2f93b54f .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/31 07:48 bpf-next bcece5dc40b9 2f93b54f .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/30 19:37 bpf-next 13a370b9d275 2f93b54f .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/30 17:03 bpf-next 13a370b9d275 2f93b54f .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/29 23:20 bpf-next 9ce64f192d16 e276de77 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/29 11:57 bpf-next f198222f0567 f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/29 08:40 bpf-next f198222f0567 f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/29 03:24 bpf-next f198222f0567 f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/28 23:40 bpf-next 7a1a98c171ea f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/27 22:45 bpf-next a493f5f9d8c2 f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/27 19:46 bpf-next 9c5904904b88 f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/27 18:15 bpf-next 9c5904904b88 f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/27 00:46 bpf-next 9c5904904b88 f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/26 07:00 bpf-next 9c5904904b88 f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/25 23:30 bpf-next 9c5904904b88 f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/25 09:21 bpf-next 10f678683e40 f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/24 19:33 bpf-next 31ad39239f08 f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/24 10:43 bpf-next a1c818109cc8 f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/24 02:07 bpf-next a1c818109cc8 f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/23 12:30 bpf-next ff4fb475cea8 f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/22 07:43 bpf-next d849f9f9768c f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/21 13:36 bpf-next d849f9f9768c f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/21 09:16 bpf-next d849f9f9768c f48c20b8 .config console log report ci-upstream-bpf-next-kasan-gce
* Struck through repros no longer work on HEAD.