linux-kernel - Re: Bug: soft lockup in exfat_clear

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Message-ID: <CAKYAXd_Zs4r2aX4M0DDQe2oYQaUwKrPq_qoNKj4kBFTSC2ynpg@mail.gmail.com>
Date: Fri, 10 Jan 2025 20:14:14 +0900
From: Namjae Jeon <linkinjeon@...nel.org>
To: Kun Hu <huk23@...udan.edu.cn>
Cc: sj1557.seo@...sung.com, yuezhang.mo@...y.com, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	"jjtan24@...udan.edu.cn" <jjtan24@...udan.edu.cn>
Subject: Re: Bug: soft lockup in exfat_clear_bitmap

On Fri, Jan 10, 2025 at 6:31 PM Kun Hu <huk23@...udan.edu.cn> wrote:
>
>
>
> > 2025年1月6日 16:45，Kun Hu <huk23@...udan.edu.cn> 写道：
> >
> > Hello,
> >
> > When using our customized fuzzer tool to fuzz the latest Linux kernel, the following crash
> > was triggered.
> >
> > HEAD commit: fc033cf25e612e840e545f8d5ad2edd6ba613ed5
> > git tree: upstream
> > Console output: https://drive.google.com/file/d/1aWtDTAUFlAzvMI7YM_TLWbfbyqKFB71i/view?usp=drive_link
> > Kernel config: https://drive.google.com/file/d/1n2sLNg-YcIgZqhhQqyMPTDWM_N1Pqz73/view?usp=sharing
> > C reproducer: https://drive.google.com/file/d/1oXFZgdxZDCrcZTmyatmI6TeYoHCaIxEA/view?usp=drive_link
> > Syzlang reproducer: https://drive.google.com/file/d/1KX9cnANDRzXZ1FjKl3uv6rSFC-5kLsko/view?usp=sharing
> >
> >
> > If you fix this issue, please add the following tag to the commit:
> > Reported-by: Kun Hu <huk23@...udan.edu.cn>, Jiaji Qin <jjtan24@...udan.edu.cn>
> >
> > watchdog: BUG: soft lockup - CPU#1 stuck for 26s! [syz-executor140:420]
> > Modules linked in:
> > irq event stamp: 163590
> > hardirqs last  enabled at (163589): [<ffffffff9c4d07eb>] irqentry_exit+0x3b/0x90 kernel/entry/common.c:357
> > hardirqs last disabled at (163590): [<ffffffff9c4cedbf>] sysvec_apic_timer_interrupt+0xf/0xb0 arch/x86/kernel/apic/apic.c:1049
> > softirqs last  enabled at (163576): [<ffffffff9450f554>] softirq_handle_end kernel/softirq.c:407 [inline]
> > softirqs last  enabled at (163576): [<ffffffff9450f554>] handle_softirqs+0x544/0x870 kernel/softirq.c:589
> > softirqs last disabled at (163555): [<ffffffff9451120e>] __do_softirq kernel/softirq.c:595 [inline]
> > softirqs last disabled at (163555): [<ffffffff9451120e>] invoke_softirq kernel/softirq.c:435 [inline]
> > softirqs last disabled at (163555): [<ffffffff9451120e>] __irq_exit_rcu kernel/softirq.c:662 [inline]
> > softirqs last disabled at (163555): [<ffffffff9451120e>] irq_exit_rcu+0xee/0x140 kernel/softirq.c:678
> > CPU: 1 UID: 0 PID: 420 Comm: syz-executor140 Not tainted 6.13.0-rc5 #1
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
> > RIP: 0010:exfat_clear_bitmap+0x3f1/0x580 fs/exfat/balloc.c:174
> > Code: 24 60 01 00 00 b9 40 0c 00 00 4c 89 fa e8 57 10 ff 01 bf a1 ff ff ff 89 c3 89 c6 e8 49 52 5f ff 83 fb a1 74 13 48 83 c4 18 5b <5d> 41 5c 41 5d 41 5e 41 5f e9 01 50 5f ff e8 fc 4f 5f ff 49 8d b4
> > RSP: 0018:ffa00000035f7a90 EFLAGS: 00000286
> > RAX: 0000000000000000 RBX: 0000000000006ccc RCX: ffffffff952a4d03
> > RDX: 0000000000000011 RSI: ff110000118ba340 RDI: 0000000000000003
> > RBP: ff110000131cc000 R08: 0000000000000000 R09: fffffbfff4d5f0ed
> > R10: fffffbfff4d5f0ec R11: 0000000000000001 R12: ff110000131ce000
> > R13: 0000000000000011 R14: 0000000000000000 R15: 0000000006cccf6b
> > FS:  000055556ed2d880(0000) GS:ff11000053a80000(0000) knlGS:0000000000000000
> > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 00007ffe1b6fdd18 CR3: 000000000db32002 CR4: 0000000000771ef0
> > PKRU: 55555554
> > Call Trace:
> > <IRQ>
> > </IRQ>
> > <TASK>
> > __exfat_free_cluster+0x775/0x980 fs/exfat/fatent.c:192
> > exfat_free_cluster+0x7a/0x100 fs/exfat/fatent.c:232
> > __exfat_truncate+0x6bf/0x900 fs/exfat/file.c:235
> > exfat_evict_inode+0x10d/0x1a0 fs/exfat/inode.c:683
> > evict+0x403/0x880 fs/inode.c:796
> > iput_final fs/inode.c:1946 [inline]
> > iput fs/inode.c:1972 [inline]
> > iput+0x51c/0x830 fs/inode.c:1958
> > do_unlinkat+0x5c7/0x750 fs/namei.c:4594
> > __do_sys_unlink fs/namei.c:4635 [inline]
> > __se_sys_unlink fs/namei.c:4633 [inline]
> > __x64_sys_unlink+0x40/0x50 fs/namei.c:4633
> > do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> > do_syscall_64+0xc3/0x1d0 arch/x86/entry/common.c:83
> > entry_SYSCALL_64_after_hwframe+0x77/0x7f
> > RIP: 0033:0x7ff5d82fb1db
> > Code: 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
> > RSP: 002b:00007ffe1b6ff558 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
> > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff5d82fb1db
> > RDX: 00007ffe1b6ff580 RSI: 00007ffe1b6ff580 RDI: 00007ffe1b6ff610
> > RBP: 00007ffe1b6ff610 R08: 0000000000000001 R09: 00007ffe1b6ff3e0
> > R10: 00000000fffffff7 R11: 0000000000000206 R12: 00007ffe1b700710
> > R13: 000055556ed36bb0 R14: 00007ffe1b6ff578 R15: 0000000000000001
> > </TASK>
> >
> >
> > ---------------
> > thanks,
> > Kun Hu
>
>
> Hi,
>
> I’m not sure if this is sufficient to help locate the bug? If you need additional information, please let me know.
Please try to reproduce it with linux-next or the latest Linus tree.
>
> Thanks,
> Kun Hu
>