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Date: Mon, 29 Nov 2021 15:37:09 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc: Jens Axboe <axboe@...nel.dk>,
syzbot <syzbot+63614029dfb79abd4383@...kaller.appspotmail.com>,
Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
Christoph Hellwig <hch@....de>,
LKML <linux-kernel@...r.kernel.org>,
Linux Memory Management List <linux-mm@...ck.org>,
lkp@...ts.01.org, lkp@...el.com
Subject: [loop] c895b784c6: INFO:rcu_sched_self-detected_stall_on_CPU
Greeting,
FYI, we noticed the following commit (built with gcc-9):
commit: c895b784c699224d690c7dfbdcff309df82366e3 ("loop: don't hold lo_mutex during __loop_clr_fd()")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
in testcase: stress-ng
version: stress-ng-x86_64-0.11-06_20211126
with following parameters:
nr_threads: 100%
disk: 1HDD
testtime: 60s
class: device
test: loop
cpufreq_governor: performance
ucode: 0xb000280
on test machine: 96 threads 2 sockets Ice Lake with 256G memory
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>
[ 194.222111][ C71] rcu: INFO: rcu_sched self-detected stall on CPU
[ 194.222114][ C71] rcu: 71-....: (14353 ticks this GP) idle=dfb/1/0x4000000000000000 softirq=9274/9274 fqs=21431
[ 194.222119][ C71] (t=100001 jiffies g=12029 q=232127)
[ 194.222123][ C71] NMI backtrace for cpu 71
[ 194.222125][ C71] CPU: 71 PID: 5857 Comm: stress-ng Not tainted 5.16.0-rc2-00042-gc895b784c699 #1
[ 194.222127][ C71] Call Trace:
[ 194.222128][ C71] <IRQ>
[ 194.222129][ C71] dump_stack_lvl (lib/dump_stack.c:107)
[ 194.222137][ C71] nmi_cpu_backtrace.cold (lib/nmi_backtrace.c:113)
[ 194.222139][ C71] ? lapic_can_unplug_cpu (arch/x86/kernel/apic/hw_nmi.c:33)
[ 194.222143][ C71] nmi_trigger_cpumask_backtrace (lib/nmi_backtrace.c:62)
[ 194.222147][ C71] rcu_dump_cpu_stacks (kernel/rcu/tree_stall.h:339 (discriminator 5))
[ 194.222151][ C71] rcu_sched_clock_irq.cold (kernel/rcu/tree_stall.h:629 kernel/rcu/tree_stall.h:711 kernel/rcu/tree.c:3878 kernel/rcu/tree.c:2597)
[ 194.222153][ C71] update_process_times (arch/x86/include/asm/preempt.h:27 kernel/time/timer.c:1787)
[ 194.222158][ C71] tick_sched_handle+0x1f/0x80
[ 194.222162][ C71] tick_sched_timer (kernel/time/tick-sched.c:1426)
[ 194.222163][ C71] ? tick_sched_do_timer (kernel/time/tick-sched.c:1408)
[ 194.222164][ C71] __hrtimer_run_queues (kernel/time/hrtimer.c:1685 kernel/time/hrtimer.c:1749)
[ 194.222166][ C71] hrtimer_interrupt (kernel/time/hrtimer.c:1814)
[ 194.222168][ C71] __sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1086 arch/x86/kernel/apic/apic.c:1103)
[ 194.222172][ C71] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1097 (discriminator 14))
[ 194.222176][ C71] </IRQ>
[ 194.222177][ C71] <TASK>
[ 194.222178][ C71] asm_sysvec_apic_timer_interrupt (arch/x86/include/asm/idtentry.h:638)
[ 194.222183][ C71] RIP: 0010:console_unlock (kernel/printk/printk.c:2719)
[ 194.222187][ C71] Code: 00 44 89 e6 48 c7 c7 40 72 c3 82 e8 99 3c 01 00 65 ff 0d d2 f9 eb 7e e9 dd fd ff ff e8 88 1b 00 00 4d 85 ed 0f 85 e3 00 00 00 <8b> 44 24 0c 85 c0 0f 84 e4 fc ff ff 31 d2 be a0 0a 00 00 48 c7 c7
All code
========
0: 00 44 89 e6 add %al,-0x1a(%rcx,%rcx,4)
4: 48 c7 c7 40 72 c3 82 mov $0xffffffff82c37240,%rdi
b: e8 99 3c 01 00 callq 0x13ca9
10: 65 ff 0d d2 f9 eb 7e decl %gs:0x7eebf9d2(%rip) # 0x7eebf9e9
17: e9 dd fd ff ff jmpq 0xfffffffffffffdf9
1c: e8 88 1b 00 00 callq 0x1ba9
21: 4d 85 ed test %r13,%r13
24: 0f 85 e3 00 00 00 jne 0x10d
2a:* 8b 44 24 0c mov 0xc(%rsp),%eax <-- trapping instruction
2e: 85 c0 test %eax,%eax
30: 0f 84 e4 fc ff ff je 0xfffffffffffffd1a
36: 31 d2 xor %edx,%edx
38: be a0 0a 00 00 mov $0xaa0,%esi
3d: 48 rex.W
3e: c7 .byte 0xc7
3f: c7 .byte 0xc7
Code starting with the faulting instruction
===========================================
0: 8b 44 24 0c mov 0xc(%rsp),%eax
4: 85 c0 test %eax,%eax
6: 0f 84 e4 fc ff ff je 0xfffffffffffffcf0
c: 31 d2 xor %edx,%edx
e: be a0 0a 00 00 mov $0xaa0,%esi
13: 48 rex.W
14: c7 .byte 0xc7
15: c7 .byte 0xc7
[ 194.222189][ C71] RSP: 0018:ffa00000222dbb50 EFLAGS: 00000206
[ 194.222191][ C71] RAX: 0000000000000000 RBX: ffffffff8357d8b8 RCX: 0000000000000008
[ 194.222192][ C71] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff8357d8b8
[ 194.222193][ C71] RBP: 000000000000004d R08: 0000000000000300 R09: 0000000000000000
[ 194.222193][ C71] R10: 0000000000000001 R11: ffffffffc0598080 R12: 0000000000000000
[ 194.222194][ C71] R13: 0000000000000200 R14: 0000000000000000 R15: 0000000000000000
[ 194.222197][ C71] vprintk_emit (arch/x86/include/asm/preempt.h:85 kernel/printk/printk.c:2246)
[ 194.222200][ C71] ? kernfs_add_one (fs/kernfs/dir.c:766)
[ 194.222202][ C71] _printk (kernel/printk/printk.c:2270)
[ 194.222204][ C71] set_capacity_and_notify.cold (block/genhd.c:96)
[ 194.222207][ C71] loop_set_size+0x11/0x40 loop
[ 194.222211][ C71] loop_configure (drivers/block/loop.c:1057) loop
[ 194.222213][ C71] lo_ioctl (drivers/block/loop.c:1546) loop
[ 194.222216][ C71] blkdev_ioctl (block/ioctl.c:588)
[ 194.222221][ C71] ? do_sys_openat2 (fs/open.c:1222)
[ 194.222225][ C71] __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:874 fs/ioctl.c:860 fs/ioctl.c:860)
[ 194.222230][ C71] do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)
[ 194.222231][ C71] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:113)
[ 194.222233][ C71] RIP: 0033:0x7f40e173b427
[ 194.222235][ C71] Code: 00 00 90 48 8b 05 69 aa 0c 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 39 aa 0c 00 f7 d8 64 89 01 48
All code
========
0: 00 00 add %al,(%rax)
2: 90 nop
3: 48 8b 05 69 aa 0c 00 mov 0xcaa69(%rip),%rax # 0xcaa73
a: 64 c7 00 26 00 00 00 movl $0x26,%fs:(%rax)
11: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax
18: c3 retq
19: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
20: 00 00 00
23: b8 10 00 00 00 mov $0x10,%eax
28: 0f 05 syscall
2a:* 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction
30: 73 01 jae 0x33
32: c3 retq
33: 48 8b 0d 39 aa 0c 00 mov 0xcaa39(%rip),%rcx # 0xcaa73
3a: f7 d8 neg %eax
3c: 64 89 01 mov %eax,%fs:(%rcx)
3f: 48 rex.W
Code starting with the faulting instruction
===========================================
0: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax
6: 73 01 jae 0x9
8: c3 retq
9: 48 8b 0d 39 aa 0c 00 mov 0xcaa39(%rip),%rcx # 0xcaa49
10: f7 d8 neg %eax
12: 64 89 01 mov %eax,%fs:(%rcx)
15: 48 rex.W
[ 194.222236][ C71] RSP: 002b:00007ffdaea025a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 194.222238][ C71] RAX: ffffffffffffffda RBX: 0000000000000028 RCX: 00007f40e173b427
[ 194.222238][ C71] RDX: 0000000000000005 RSI: 0000000000004c00 RDI: 0000000000000007
[ 194.222239][ C71] RBP: 0000000000000006 R08: 0000000000000000 R09: 00007ffdaea02316
[ 194.222240][ C71] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000007
[ 194.222240][ C71] R13: 00000000000003e8 R14: 00007ffdaea06980 R15: 00007ffdaea038b0
[ 194.222242][ C71] </TASK>
To reproduce:
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
sudo bin/lkp install job.yaml # job file is attached in this email
bin/lkp split-job --compatible job.yaml # generate the yaml file for lkp run
sudo bin/lkp run generated-yaml-file
# if come across any failure that blocks the test,
# please remove ~/.lkp and /lkp dir to run from a clean state.
---
0DAY/LKP+ Test Infrastructure Open Source Technology Center
https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation
Thanks,
Oliver Sang
View attachment "config-5.16.0-rc2-00042-gc895b784c699" of type "text/plain" (173517 bytes)
View attachment "job-script" of type "text/plain" (8320 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (167968 bytes)
View attachment "stress-ng" of type "text/plain" (944 bytes)
View attachment "job.yaml" of type "text/plain" (5672 bytes)
View attachment "reproduce" of type "text/plain" (337 bytes)
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