RE: d646969055: WARNING:at_kernel/ucount.c:#dec_rlimit_ucounts

From: Si, Beibei
Date: Tue Sep 14 2021 - 21:54:14 EST

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Hi, legion

> -----Original Message-----
> From: Alexey Gladkov <legion@xxxxxxxxxx>
> Sent: Tuesday, September 14, 2021 3:40 AM
> To: Sang, Oliver <oliver.sang@xxxxxxxxx>
> Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>; LKML <linux-
> kernel@xxxxxxxxxxxxxxx>; lkp@xxxxxxxxxxxx; lkp <lkp@xxxxxxxxx>
> Subject: Re: d646969055: WARNING:at_kernel/ucount.c:#dec_rlimit_ucounts
>
> On Mon, Sep 13, 2021 at 10:16:54PM +0800, kernel test robot wrote:
> >
> >
> > Greeting,
> >
> > FYI, we noticed the following commit (built with gcc-9):
> >
> > commit: d64696905554e919321e31afc210606653b8f6a4 ("Reimplement
> > RLIMIT_SIGPENDING on top of ucounts")
> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> >
> >
> > in testcase: trinity
> > version: trinity-i386
> > with following parameters:
> >
> > number: 99999
> > group: group-02
> >
> > test-description: Trinity is a linux system call fuzz tester.
> > test-url: http://codemonkey.org.uk/projects/trinity/
> >
> >
> > on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp
> > 2 -m 16G
> >
> > 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@xxxxxxxxx>
> >
> >
> > [ 558.756672][ T2642] WARNING: CPU: 0 PID: 2642 at kernel/ucount.c:268
> > dec_rlimit_ucounts (kernel/ucount.c:268 (discriminator 1)) [
> > 558.758020][ T2642] Modules linked in: uvesafb cfbfillrect cfbimgblt
> > cfbcopyarea fb fbdev ppdev crc32_pclmul input_leds led_class intel_agp
> > intel_gtt parport_pc parport qemu_fw_cfg [ 558.766247][ T2642] CPU: 0
> > PID: 2642 Comm: trinity-main Not tainted 5.12.0-gd64696905554 #1 [
> > 558.767543][ T2642] Hardware name: QEMU Standard PC (i440FX + PIIX,
> > 1996), BIOS 1.12.0-1 04/01/2014 [ 558.772150][ T2642] EIP:
> dec_rlimit_ucounts (kernel/ucount.c:268 (discriminator 1)) [ 558.772945][ T2642]
> Code: 68 73 6c c3 01 83 15 6c 73 6c c3 00 85 c0 0f 94 c0 83 c4 04 5b 5e 5f 5d c3
> 8d 76 00 83 05 50 73 6c c3 01 83 15 54 73 6c c3 00 <0f> 0b 83 05 58 73 6c c3 01
> 83 15 5c 73 6c c3 00 eb 9d 8d b4 26 00 All code ========
> > 0: 68 73 6c c3 01 pushq $0x1c36c73
> > 5: 83 15 6c 73 6c c3 00 adcl $0x0,-0x3c938c94(%rip) #
> 0xffffffffc36c7378
> > c: 85 c0 test %eax,%eax
> > e: 0f 94 c0 sete %al
> > 11: 83 c4 04 add $0x4,%esp
> > 14: 5b pop %rbx
> > 15: 5e pop %rsi
> > 16: 5f pop %rdi
> > 17: 5d pop %rbp
> > 18: c3 retq
> > 19: 8d 76 00 lea 0x0(%rsi),%esi
> > 1c: 83 05 50 73 6c c3 01 addl $0x1,-0x3c938cb0(%rip) #
> 0xffffffffc36c7373
> > 23: 83 15 54 73 6c c3 00 adcl $0x0,-0x3c938cac(%rip) #
> 0xffffffffc36c737e
> > 2a:* 0f 0b ud2 <-- trapping instruction
> > 2c: 83 05 58 73 6c c3 01 addl $0x1,-0x3c938ca8(%rip) #
> 0xffffffffc36c738b
> > 33: 83 15 5c 73 6c c3 00 adcl $0x0,-0x3c938ca4(%rip) #
> 0xffffffffc36c7396
> > 3a: eb 9d jmp 0xffffffffffffffd9
> > 3c: 8d .byte 0x8d
> > 3d: b4 26 mov $0x26,%ah
> > ...
> >
> > Code starting with the faulting instruction
> > ===========================================
> > 0: 0f 0b ud2
> > 2: 83 05 58 73 6c c3 01 addl $0x1,-0x3c938ca8(%rip) #
> 0xffffffffc36c7361
> > 9: 83 15 5c 73 6c c3 00 adcl $0x0,-0x3c938ca4(%rip) #
> 0xffffffffc36c736c
> > 10: eb 9d jmp 0xffffffffffffffaf
> > 12: 8d .byte 0x8d
> > 13: b4 26 mov $0x26,%ah
> > ...
> > [ 558.779398][ T2642] EAX: f63271e0 EBX: f63271e0 ECX: 00000001 EDX:
> > ffffffff [ 558.781206][ T2642] ESI: 0000003c EDI: ffffffff EBP:
> > f62e3eac ESP: f62e3e9c [ 558.782613][ T2642] DS: 007b ES: 007b FS:
> > 0000 GS: 0033 SS: 0068 EFLAGS: 00010246 [ 558.783747][ T2642] CR0:
> > 80050033 CR2: 08082ff0 CR3: 362b0000 CR4: 00040690 [ 558.792353][ T2642]
> Call Trace:
> > [ 558.793036][ T2642] ? release_task (include/linux/rcupdate.h:654
> > kernel/exit.c:191) [ 558.793936][ T2642] release_task
> > (kernel/exit.c:191) [ 558.794818][ T2642] wait_task_zombie
> > (kernel/exit.c:1107) [ 558.800667][ T2642] wait_consider_task
> > (kernel/exit.c:1334) [ 558.801693][ T2642] ? _raw_read_lock
> > (include/linux/rwlock_api_smp.h:149 kernel/locking/spinlock.c:223) [
> > 558.802645][ T2642] do_wait (kernel/exit.c:1399 kernel/exit.c:1468) [
> > 558.803462][ T2642] kernel_wait4 (kernel/exit.c:1630) [ 558.806901][
> > T2642] ? kill_orphaned_pgrp (kernel/exit.c:1422) [ 558.808347][ T2642]
> > __ia32_sys_waitpid (kernel/exit.c:1675 kernel/exit.c:1673
> > kernel/exit.c:1673) [ 558.809338][ T2642] do_int80_syscall_32
> > (arch/x86/entry/common.c:77 arch/x86/entry/common.c:94) [ 558.810319][
> > T2642] entry_INT80_32 (arch/x86/entry/entry_32.S:1064) [ 558.811254][
> > T2642] EIP: 0x809b132 [ 558.815723][ T2642] Code: 89 c8 c3 90 8d 74 26
> > 00 85 c0 c7 01 01 00 00 00 75 d8 a1 6c 94 a8 08 eb d1 66 90 66 90 66 90 66 90
> 66 90 66 90 66 90 90 cd 80 <c3> 8d b6 00 00 00 00 8d bc 27 00 00 00 00 8b 10 a3
> 94 94 a8 08 85 All code ========
> > 0: 89 c8 mov %ecx,%eax
> > 2: c3 retq
> > 3: 90 nop
> > 4: 8d 74 26 00 lea 0x0(%rsi,%riz,1),%esi
> > 8: 85 c0 test %eax,%eax
> > a: c7 01 01 00 00 00 movl $0x1,(%rcx)
> > 10: 75 d8 jne 0xffffffffffffffea
> > 12: a1 6c 94 a8 08 eb d1 movabs 0x9066d1eb08a8946c,%eax
> > 19: 66 90
> > 1b: 66 90 xchg %ax,%ax
> > 1d: 66 90 xchg %ax,%ax
> > 1f: 66 90 xchg %ax,%ax
> > 21: 66 90 xchg %ax,%ax
> > 23: 66 90 xchg %ax,%ax
> > 25: 66 90 xchg %ax,%ax
> > 27: 90 nop
> > 28: cd 80 int $0x80
> > 2a:* c3 retq <-- trapping instruction
> > 2b: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi
> > 31: 8d bc 27 00 00 00 00 lea 0x0(%rdi,%riz,1),%edi
> > 38: 8b 10 mov (%rax),%edx
> > 3a: a3 .byte 0xa3
> > 3b: 94 xchg %eax,%esp
> > 3c: 94 xchg %eax,%esp
> > 3d: a8 08 test $0x8,%al
> > 3f: 85 .byte 0x85
> >
> > Code starting with the faulting instruction
> > ===========================================
> > 0: c3 retq
> > 1: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi
> > 7: 8d bc 27 00 00 00 00 lea 0x0(%rdi,%riz,1),%edi
> > e: 8b 10 mov (%rax),%edx
> > 10: a3 .byte 0xa3
> > 11: 94 xchg %eax,%esp
> > 12: 94 xchg %eax,%esp
> > 13: a8 08 test $0x8,%al
> > 15: 85 .byte 0x85
> > [ 558.820109][ T2642] EAX: ffffffda EBX: 00000f0f ECX: bfb23394 EDX:
> > 0000000b [ 558.821480][ T2642] ESI: 00000002 EDI: 08a890fc EBP:
> > 08a89034 ESP: bfb23364 [ 558.822693][ T2642] DS: 007b ES: 007b FS:
> > 0000 GS: 0033 SS: 007b EFLAGS: 00000246 [ 558.828056][ T2642] irq
> > event stamp: 1348273 [ 558.828922][ T2642] hardirqs last enabled at
> > (1348281): console_unlock (kernel/printk/printk.c:2605 (discriminator
> > 1)) [ 558.830629][ T2642] hardirqs last disabled at (1348288):
> > console_unlock (kernel/printk/printk.c:2520 (discriminator 1)) [
> > 558.833190][ T2642] softirqs last enabled at (1348240): __do_softirq
> > (kernel/softirq.c:372) [ 558.834715][ T2642] softirqs last disabled at
> > (1348231): do_softirq_own_stack (arch/x86/kernel/irq_32.c:60
> > arch/x86/kernel/irq_32.c:149) [ 558.840026][ T2642] ---[ end trace
> > 6bbb25560ce8d9b6 ]---
> >
> >
> > To reproduce:
> >
> > # build kernel
> > cd linux
> > cp config-5.12.0-gd64696905554 .config
> > make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare
> > modules_prepare bzImage
> >
> > 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
>
> I am unable to run the test following this instruction.

After double check, we can reproduce this issue, could you kindly offer your full log and the reproducing steps?

As the log you mentioned, below [1] shows our corresponding log, they are very similar, only we don't have depmod error, I found some solutions and add their links here, could you check if they can solve your issue? Thanks.

depmod: ERROR: could not open directory /lib/modules/5.14.0-09687-g27151f177827: No such file or directory
depmod: FATAL: could not search modules: No such file or directory

https://stackoverflow.com/questions/28644386/kernel-install-gives-missing-module-error
https://serverfault.com/questions/780980/error-could-not-open-directory-lib-modules-4-2-0-25-generic-no-such-file-or-d

[1]

[ 12.451508][ T142] udevd[142]: starting version 3.2.7
[ 12.452573][ T142] random: udevd: uninitialized urandom read (16 bytes read)
[ 12.453575][ T142] random: udevd: uninitialized urandom read (16 bytes read)
[ 12.454383][ T142] random: udevd: uninitialized urandom read (16 bytes read)
[ 12.457336][ T142] udevd[142]: specified group 'kvm' unknown
[ 12.461646][ T143] udevd[143]: starting eudev-3.2.7
[ 12.505124][ T143] udevd[143]: specified group 'kvm' unknown
[ 12.551437][ T155] parport_pc 00:04: reported by Plug and Play ACPI
[ 12.552300][ T155] parport0: PC-style at 0x378, irq 7 [PCSPP,TRISTATE]
[ 12.631105][ T145] udevadm (145) used greatest stack depth: 6188 bytes left
[ 12.677804][ T155] parport_pc parport_pc.956: Unable to set coherent dma mask: disabling DMA
[ 12.679095][ T155] parport_pc parport_pc.888: Unable to set coherent dma mask: disabling DMA
[ 12.680302][ T155] parport_pc parport_pc.632: Unable to set coherent dma mask: disabling DMA
[ 12.816138][ T148] ppdev: user-space parallel port driver
[ 13.828199][ T161] _warn_unseeded_randomness: 196 callbacks suppressed
[ 13.828206][ T161] random: get_random_u32 called from arch_rnd+0x32/0x80 with crng_init=1
[ 13.828215][ T161] random: get_random_u32 called from randomize_stack_top+0x4b/0x80 with crng_init=1
[ 13.828223][ T161] random: get_random_u32 called from arch_align_stack+0x5b/0x80 with crng_init=1
[ 13.850739][ T168] uvesafb: failed to execute /sbin/v86d
[ 13.851380][ T168] uvesafb: make sure that the v86d helper is installed and executable
[ 13.852224][ T168] uvesafb: Getting VBE info block failed (eax=0x4f00, err=-2)
[ 13.853009][ T168] uvesafb: vbe_init() failed with -22
[ 13.853713][ T168] uvesafb: probe of uvesafb.0 failed with error -22
hwclock: can't open '/dev/misc/rtc': No such file or directory
[ 14.052516][ T289] urandom_read: 3 callbacks suppressed
[ 14.052519][ T289] random: dd: uninitialized urandom read (512 bytes read)
INIT: Entering runlevel: 5
Configuring network interfaces... ip: RTNETLINK answers: File exists
hwclock: can't open '/dev/misc/rtc': No such file or directory
Starting syslogd/klogd: done
/etc/rc5.d/S77lkp-bootstrap: /lkp/jobs/scheduled/vm-snb-43/trinity-group-02-99999-yocto-i386-minimal-20190520.cgz-d64696905554e919321e31afc210606653b8f6a4-20210911-24127-1x1tp2
w-8.sh: line 123: start: not found
PATH=/sbin:/usr/sbin:/bin:/usr/bin:/lkp/root/src/bin
[ 14.141304][ T181] bootlogd (181) used greatest stack depth: 6124 bytes left
export VM_VIRTFS=1 due to result service 9p/virtfs_mount
LKP: HOSTNAME vm-snb-43, MAC 52:54:00:12:34:56, kernel 5.12.0-gd64696905554 1, serial co
nsole /dev/ttyS0

Poky (Yocto Project Reference Distro) 2.7+snapshot vm-snb-43 /dev/ttyS0

INIT: Id "S1" respawning too fast: disabled for 5 minutes

>
> I see a log like this:
>
> [ 11.641013][ T144] udevd[144]: starting version 3.2.7
> [ 11.641708][ T144] random: udevd: uninitialized urandom read (16 bytes read)
> [ 11.642545][ T144] random: udevd: uninitialized urandom read (16 bytes read)
> [ 11.643211][ T144] random: udevd: uninitialized urandom read (16 bytes read)
> [ 11.645112][ T144] udevd[144]: specified group 'kvm' unknown
> [ 11.648240][ T145] udevd[145]: starting eudev-3.2.7
> [ 11.676942][ T145] udevd[145]: specified group 'kvm' unknown
> [ 12.871897][ T163] _warn_unseeded_randomness: 197 callbacks suppressed
> [ 12.871904][ T163] random: get_random_u32 called from
> arch_rnd+0x32/0x80 with crng_init=1
> [ 12.871912][ T163] random: get_random_u32 called from
> randomize_stack_top+0x53/0x70 with crng_init=1
> [ 12.871917][ T163] random: get_random_u32 called from
> arch_align_stack+0x5b/0x80 with crng_init=1
> depmod: ERROR: could not open directory /lib/modules/5.14.0-09687-
> g27151f177827: No such file or directory
> depmod: WARNING: -e needs -E or -F
> depmod: ERROR: could not open directory /lib/modules/5.14.0-09687-
> g27151f177827: No such file or directory
> depmod: FATAL: could not search modules: No such file or directory
> hwclock: can't open '/dev/misc/rtc': No such file or directory
> [ 13.047209][ T291] urandom_read: 3 callbacks suppressed
> [ 13.047212][ T291] random: dd: uninitialized urandom read (512 bytes read)
> INIT: Entering runlevel: 5
> Configuring network interfaces... ip: RTNETLINK answers: File exists
> hwclock: can't open '/dev/misc/rtc': No such file or directory Starting
> syslogd/klogd: done
> /etc/rc5.d/S77lkp-bootstrap: /lkp/jobs/scheduled/vm-snb-43/trinity-group-02-
> 99999-yocto-i386-minimal-20190520.cgz-
> d64696905554e919321e31afc210606653b8f6a4-20210911-24127-1x1tp2w-8.sh:
> line 123: start: not found
> /etc/rc5.d/S77lkp-bootstrap: line 75: /lkp/root/src/bin/lkp-setup-rootfs: not
> found
> [ 13.103013][ T183] bootlogd (183) used greatest stack depth: 6132 bytes left
> INIT: Id "S1" respawning too fast: disabled for 5 minutes
>
> --
> Rgrds, legion

Next message: yukuai (C): "Re: [PATCH v5 5/6] nbd: convert to use blk_mq_find_and_get_req()"
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In reply to: Alexey Gladkov: "Re: d646969055: WARNING:at_kernel/ucount.c:#dec_rlimit_ucounts"
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