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Date: Mon, 13 Sep 2021 21:39:38 +0200
From: Alexey Gladkov <legion@...nel.org>
To: kernel test robot <oliver.sang@...el.com>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>,
LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
lkp@...el.com
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@...el.com>
>
>
> [ 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.
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
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