From: syzbot <syzbot+2617fc732430968b45d2@syzkaller.appspotmail.com>
To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [kernel?] KASAN: vmalloc-out-of-bounds Read in run_irq_workd
Date: Thu, 09 Oct 2025 08:12:24 -0700 [thread overview]
Message-ID: <68e7d0d8.050a0220.91a22.0008.GAE@google.com> (raw)
In-Reply-To: <68b3985f.a00a0220.1337b0.0028.GAE@google.com>
syzbot has found a reproducer for the following issue on:
HEAD commit: ec714e371f22 Merge tag 'perf-tools-for-v6.18-1-2025-10-08'..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1284a1e2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=db9c80a8900dca57
dashboard link: https://syzkaller.appspot.com/bug?extid=2617fc732430968b45d2
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1200b458580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17a24b34580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6d5cce2bcf5d/disk-ec714e37.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/60dff1e3a58f/vmlinux-ec714e37.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6a1823720b55/bzImage-ec714e37.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2617fc732430968b45d2@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: vmalloc-out-of-bounds in irq_work_run_list kernel/irq_work.c:251 [inline]
BUG: KASAN: vmalloc-out-of-bounds in run_irq_workd+0x116/0x190 kernel/irq_work.c:305
Read of size 8 at addr ffffc9000cc08090 by task irq_work/1/26
CPU: 1 UID: 0 PID: 26 Comm: irq_work/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xca/0x240 mm/kasan/report.c:482
kasan_report+0x118/0x150 mm/kasan/report.c:595
irq_work_run_list kernel/irq_work.c:251 [inline]
run_irq_workd+0x116/0x190 kernel/irq_work.c:305
smpboot_thread_fn+0x53f/0xa60 kernel/smpboot.c:160
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4b9/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
The buggy address belongs to a vmalloc virtual mapping
Memory state around the buggy address:
ffffc9000cc07f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
ffffc9000cc08000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
>ffffc9000cc08080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
^
ffffc9000cc08100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
ffffc9000cc08180: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
next prev parent reply other threads:[~2025-10-09 15:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-31 0:33 [syzbot] [kernel?] KASAN: vmalloc-out-of-bounds Read in run_irq_workd syzbot
2025-10-09 15:12 ` syzbot [this message]
2025-10-17 20:55 ` [PATCH] bpf: sync pending IRQ work before freeing ring buffer neqbal
2025-10-17 21:22 ` [syzbot] [kernel?] KASAN: vmalloc-out-of-bounds Read in run_irq_workd syzbot
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