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

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Message-Id: <04205AC4-F899-4FA0-A7C1-9B1D661EB4EA@m.fudan.edu.cn>
Date: Fri, 10 Jan 2025 17:30:37 +0800
From: Kun Hu <huk23@...udan.edu.cn>
To: linkinjeon@...nel.org,
 sj1557.seo@...sung.com,
 yuezhang.mo@...y.com
Cc: 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



> 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.

Thanks,
Kun Hu