From: syzbot <syzbot+1f77b8ca15336fff21ff@syzkaller.appspotmail.com>
To: cassel@kernel.org, dlemoal@kernel.org, linux-ide@vger.kernel.org,
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: [syzbot] [ide?] UBSAN: shift-out-of-bounds in ata_qc_issue
Date: Tue, 17 Feb 2026 12:55:35 -0800 [thread overview]
Message-ID: <6994d5c7.a70a0220.2c38d7.010b.GAE@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: ca4ee40bf13d Partly revert "drm/hyperv: Remove reference t..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13c6c722580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a771bfd268751cd6
dashboard link: https://syzkaller.appspot.com/bug?extid=1f77b8ca15336fff21ff
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-ca4ee40b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c714adf37ddd/vmlinux-ca4ee40b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4d56cd9f6175/bzImage-ca4ee40b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1f77b8ca15336fff21ff@syzkaller.appspotmail.com
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in drivers/ata/libata-core.c:5166:24
shift exponent 4210818301 is too large for 64-bit type 'long long unsigned int'
CPU: 2 UID: 0 PID: 1282 Comm: kworker/2:1H Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events_highpri ata_scsi_deferred_qc_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
ubsan_epilogue+0xa/0x30 lib/ubsan.c:233
__ubsan_handle_shift_out_of_bounds+0x279/0x2a0 lib/ubsan.c:494
ata_qc_issue.cold+0x38/0x9f drivers/ata/libata-core.c:5166
ata_scsi_deferred_qc_work+0x154/0x1f0 drivers/ata/libata-scsi.c:1679
process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
process_scheduled_works kernel/workqueue.c:3358 [inline]
worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
kthread+0x370/0x450 kernel/kthread.c:467
ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
---[ end trace ]---
Kernel panic - not syncing: UBSAN: panic_on_warn set ...
CPU: 2 UID: 0 PID: 1282 Comm: kworker/2:1H Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events_highpri ata_scsi_deferred_qc_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
vpanic+0x552/0x970 kernel/panic.c:650
panic+0xd1/0xe0 kernel/panic.c:787
check_panic_on_warn kernel/panic.c:524 [inline]
check_panic_on_warn.cold+0x19/0x34 kernel/panic.c:519
__ubsan_handle_shift_out_of_bounds+0x279/0x2a0 lib/ubsan.c:494
ata_qc_issue.cold+0x38/0x9f drivers/ata/libata-core.c:5166
ata_scsi_deferred_qc_work+0x154/0x1f0 drivers/ata/libata-scsi.c:1679
process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
process_scheduled_works kernel/workqueue.c:3358 [inline]
worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
kthread+0x370/0x450 kernel/kthread.c:467
ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
next reply other threads:[~2026-02-17 20:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-17 20:55 syzbot [this message]
2026-02-18 9:45 ` [syzbot] [ide?] UBSAN: shift-out-of-bounds in ata_qc_issue Niklas Cassel
2026-02-19 1:33 ` Damien Le Moal
2026-02-20 0:55 ` Niklas Cassel
2026-02-20 1:06 ` Damien Le Moal
2026-02-20 9:17 ` Dmitry Vyukov
2026-02-20 9:27 ` Niklas Cassel
2026-02-19 22:44 ` Niklas Cassel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=6994d5c7.a70a0220.2c38d7.010b.GAE@google.com \
--to=syzbot+1f77b8ca15336fff21ff@syzkaller.appspotmail.com \
--cc=cassel@kernel.org \
--cc=dlemoal@kernel.org \
--cc=linux-ide@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=syzkaller-bugs@googlegroups.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox