linux-kernel - [EXP softirq] 3f6b5ffc70: Kernel_panic-not_syncing:kmem_cache_create:Failed_to_create

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Message-ID: <20180307041016.wvulwt5y2s6his6f@inn>
Date:   Wed, 7 Mar 2018 12:10:16 +0800
From:   kernel test robot <fengguang.wu@...el.com>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, lkp@...org
Subject: [EXP softirq]  3f6b5ffc70:
 Kernel_panic-not_syncing:kmem_cache_create:Failed_to_create_slab'pid'.Error


FYI, we noticed the following commit (built with gcc-7):

commit: 3f6b5ffc706a54598b82456ae0be395aa6465982 ("EXP softirq: Is it possible to RCUify BH disable/enable?")
https://git.kernel.org/cgit/linux/kernel/git/paulmck/linux-rcu.git dev.2018.03.01a

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu host -smp 2 -m 2G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+-----------------------------------------------------------------------------+------------+------------+
|                                                                             | 08c5ee9132 | 3f6b5ffc70 |
+-----------------------------------------------------------------------------+------------+------------+
| boot_successes                                                              | 12         | 0          |
| boot_failures                                                               | 0          | 21         |
| Kernel_panic-not_syncing:kmem_cache_create:Failed_to_create_slab'pid'.Error | 0          | 19         |
| BUG:kernel_in_stage                                                         | 0          | 2          |
+-----------------------------------------------------------------------------+------------+------------+



[    0.052000] tsc: Detected 2260.998 MHz processor
[    0.052036] clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x20974986637, max_idle_ns: 440795286310 ns
[    0.056033] Calibrating delay loop (skipped) preset value.. 4521.99 BogoMIPS (lpj=9043992)
[    0.060062] pid_max: default: 32768 minimum: 301
[    0.064030] kmem_cache_create(pid) integrity check failed
[    0.068033] Kernel panic - not syncing: kmem_cache_create: Failed to create slab 'pid'. Error -22
[    0.068033] 
[    0.072000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.16.0-rc1-00055-g3f6b5ff #33
[    0.072000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[    0.072000] Call Trace:
[    0.072000]  dump_stack+0x5d/0x79
[    0.072000]  panic+0xd8/0x229
[    0.072000]  ? printk+0x43/0x4b
[    0.072000]  kmem_cache_create_usercopy+0x1f2/0x224
[    0.072000]  kmem_cache_create+0x12/0x14
[    0.072000]  pid_idr_init+0xb0/0xba
[    0.072000]  start_kernel+0x367/0x3f3
[    0.072000]  secondary_startup_64+0xa5/0xb0

Elapsed time: 10

#!/bin/bash



To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
lkp

View attachment "config-4.16.0-rc1-00055-g3f6b5ff" of type "text/plain" (110565 bytes)

View attachment "job-script" of type "text/plain" (4211 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (4768 bytes)