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Date: Thu, 21 Oct 2021 23:30:33 +0800
From: Anand Jain <anand.jain@...cle.com>
To: kernel test robot <oliver.sang@...el.com>
Cc: 0day robot <lkp@...el.com>, LKML <linux-kernel@...r.kernel.org>,
lkp@...ts.01.org, linux-btrfs@...r.kernel.org, dsterba@...e.com
Subject: Re: [btrfs] 0f80799866: WARNING:at_fs/sysfs/file.c:#sysfs_emit
On 21/10/2021 21:35, kernel test robot wrote:
>
>
> Greeting,
>
> FYI, we noticed the following commit (built with gcc-9):
>
> commit: 0f807998661ecadb74638c18cbaff8785bb46f8d ("[PATCH 1/2] btrfs: sysfs convert scnprintf and snprintf to use sysfs_emit")
> url: https://github.com/0day-ci/linux/commits/Anand-Jain/provide-fsid-in-sysfs-devinfo/20211019-082356
> base: https://git.kernel.org/cgit/linux/kernel/git/kdave/linux.git for-next
>
> in testcase: boot
>
> on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> +----------------------------------------+------------+------------+
> | | 00c9626f46 | 0f80799866 |
> +----------------------------------------+------------+------------+
> | boot_successes | 12 | 0 |
> | boot_failures | 0 | 12 |
> | WARNING:at_fs/sysfs/file.c:#sysfs_emit | 0 | 12 |
> | EIP:sysfs_emit | 0 | 12 |
> +----------------------------------------+------------+------------+
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <oliver.sang@...el.com>
>
>
> [ 17.140001][ T1] WARNING: CPU: 0 PID: 1 at fs/sysfs/file.c:737 sysfs_emit (fs/sysfs/file.c:737)
> [ 17.141231][ T1] Modules linked in:
> [ 17.141878][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.15.0-rc5-00151-g0f807998661e #2
> [ 17.143180][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
> [ 17.144848][ T1] EIP: sysfs_emit (fs/sysfs/file.c:737)
> [ 17.145557][ T1] Code: e8 76 ec 66 00 83 c4 08 5b 5d c3 ba 01 00 00 00 b8 00 fa 50 cc e8 d1 a9 e2 ff 89 5c 24 04 c7 04 24 b1 88 c7 cb e8 da 0d 14 01 <0f> 0b b8 e8 f9 50 cc 31 c9 c7 04 24 01 00 00 00 ba 01 00 00 00 e8
> All code
> ========
> 0: e8 76 ec 66 00 callq 0x66ec7b
> 5: 83 c4 08 add $0x8,%esp
> 8: 5b pop %rbx
> 9: 5d pop %rbp
> a: c3 retq
> b: ba 01 00 00 00 mov $0x1,%edx
> 10: b8 00 fa 50 cc mov $0xcc50fa00,%eax
> 15: e8 d1 a9 e2 ff callq 0xffffffffffe2a9eb
> 1a: 89 5c 24 04 mov %ebx,0x4(%rsp)
> 1e: c7 04 24 b1 88 c7 cb movl $0xcbc788b1,(%rsp)
> 25: e8 da 0d 14 01 callq 0x1140e04
> 2a:* 0f 0b ud2 <-- trapping instruction
> 2c: b8 e8 f9 50 cc mov $0xcc50f9e8,%eax
> 31: 31 c9 xor %ecx,%ecx
> 33: c7 04 24 01 00 00 00 movl $0x1,(%rsp)
> 3a: ba 01 00 00 00 mov $0x1,%edx
> 3f: e8 .byte 0xe8
>
> Code starting with the faulting instruction
> ===========================================
> 0: 0f 0b ud2
> 2: b8 e8 f9 50 cc mov $0xcc50f9e8,%eax
> 7: 31 c9 xor %ecx,%ecx
> 9: c7 04 24 01 00 00 00 movl $0x1,(%rsp)
> 10: ba 01 00 00 00 mov $0x1,%edx
> 15: e8 .byte 0xe8
> [ 17.148128][ T1] EAX: 00000020 EBX: cce568e0 ECX: 00000000 EDX: 00000000
> [ 17.149078][ T1] ESI: cce54ae0 EDI: cce568e0 EBP: c181fed4 ESP: c181fec8
> [ 17.150009][ T1] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010296
> [ 17.151159][ T1] CR0: 80050033 CR2: 00000000 CR3: 0c709000 CR4: 000406d0
> [ 17.152227][ T1] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> [ 17.153237][ T1] DR6: fffe0ff0 DR7: 00000400
> [ 17.153964][ T1] Call Trace:
> [ 17.154511][ T1] btrfs_init_sysfs (fs/btrfs/sysfs.c:1310 fs/btrfs/sysfs.c:2023)
> [ 17.155279][ T1] ? tracefs_create_instance_dir (fs/btrfs/super.c:2552)
> [ 17.156161][ T1] init_btrfs_fs (fs/btrfs/super.c:2558)
> [ 17.156848][ T1] do_one_initcall (init/main.c:1303)
> [ 17.157551][ T1] ? parse_args (kernel/params.c:153 kernel/params.c:188)
> [ 17.158265][ T1] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
> [ 17.159070][ T1] kernel_init_freeable (init/main.c:1375 init/main.c:1392 init/main.c:1411 init/main.c:1614)
> [ 17.163787][ T1] ? rest_init (init/main.c:1497)
> [ 17.171751][ T1] kernel_init (init/main.c:1507)
> [ 17.172549][ T1] ? schedule_tail_wrapper (arch/x86/entry/entry_32.S:740)
> [ 17.173320][ T1] ret_from_fork (arch/x86/entry/entry_32.S:775)
> [ 17.174042][ T1] irq event stamp: 2402249
> [ 17.174752][ T1] hardirqs last enabled at (2402257): __up_console_sem (kernel/printk/printk.c:255 (discriminator 1))
> [ 17.176070][ T1] hardirqs last disabled at (2402272): __up_console_sem (kernel/printk/printk.c:253 (discriminator 1))
> [ 17.177397][ T1] softirqs last enabled at (2402270): __do_softirq (kernel/softirq.c:402 kernel/softirq.c:587)
> [ 17.178704][ T1] softirqs last disabled at (2402265): do_softirq_own_stack (arch/x86/kernel/irq_32.c:60 arch/x86/kernel/irq_32.c:149)
> [ 17.180238][ T1] ---[ end trace c9e9be0944a14324 ]---
> [ 17.181055][ T1] ------------[ cut here ]------------
> [ 17.184298][ T1] invalid sysfs_emit: buf:cce568ed
>
>
> To reproduce:
A modload is good enough to reproduce. Unfortunately, I didn't check
the dmesg for Warnings during the hand testing.
Fixed in V2.
Thanks, Anand
>
> # build kernel
> cd linux
> cp config-5.15.0-rc5-00151-g0f807998661e .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
>
> # 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
>
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