[syzbot] [sctp?] [reiserfs?] KMSAN: uninit-value in __schedule (4)

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Sep 5, 2023, 1:55:03 PM9/5/23
to b...@alien8.de, bra...@kernel.org, dave....@linux.intel.com, h...@zytor.com, linux-...@vger.kernel.org, linux-...@vger.kernel.org, linux...@vger.kernel.org, lucie...@gmail.com, marcelo...@gmail.com, mi...@redhat.com, net...@vger.kernel.org, reiserf...@vger.kernel.org, syzkall...@googlegroups.com, tg...@linutronix.de, x...@kernel.org
Hello,

syzbot found the following issue on:

HEAD commit: a47fc304d2b6 Add linux-next specific files for 20230831
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=131da298680000
kernel config: https://syzkaller.appspot.com/x/.config?x=6ecd2a74f20953b9
dashboard link: https://syzkaller.appspot.com/bug?extid=00f1a932d27258b183e7
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=116e5fcba80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=118e912fa80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b2e8f4217527/disk-a47fc304.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ed6cdcc09339/vmlinux-a47fc304.xz
kernel image: https://storage.googleapis.com/syzbot-assets/bd9b2475bf5a/bzImage-a47fc304.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/7f082e2bc08a/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+00f1a9...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: unknown-crash in schedule_debug kernel/sched/core.c:5936 [inline]
BUG: KASAN: unknown-crash in __schedule+0x5790/0x59f0 kernel/sched/core.c:6589
Read of size 8 at addr ffffc90003728000 by task kworker/0:3/4784

CPU: 0 PID: 4784 Comm: kworker/0:3 Not tainted 6.5.0-next-20230831-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Workqueue: 0x0 (events_long)
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xc4/0x620 mm/kasan/report.c:475
kasan_report+0xda/0x110 mm/kasan/report.c:588
schedule_debug kernel/sched/core.c:5936 [inline]
__schedule+0x5790/0x59f0 kernel/sched/core.c:6589
schedule+0xe7/0x1b0 kernel/sched/core.c:6771
worker_thread+0x2e3/0x1290 kernel/workqueue.c:2799
kthread+0x33a/0x430 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
</TASK>

The buggy address belongs to stack of task kworker/0:3/4784

The buggy address belongs to the virtual mapping at
[ffffc90003728000, ffffc90003731000) created by:
kernel_clone+0xfd/0x930 kernel/fork.c:2909

The buggy address belongs to the physical page:
page:ffffea0000a5dd80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29776
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 2, tgid 2 (kthreadd), ts 60852994625, free_ts 55847803194
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1530
prep_new_page mm/page_alloc.c:1537 [inline]
get_page_from_freelist+0xf17/0x2e50 mm/page_alloc.c:3200
__alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4456
__alloc_pages_bulk+0x77a/0x1110 mm/page_alloc.c:4404
alloc_pages_bulk_array_node include/linux/gfp.h:210 [inline]
vm_area_alloc_pages mm/vmalloc.c:3033 [inline]
__vmalloc_area_node mm/vmalloc.c:3139 [inline]
__vmalloc_node_range+0x4db/0x1540 mm/vmalloc.c:3320
alloc_thread_stack_node kernel/fork.c:309 [inline]
dup_task_struct kernel/fork.c:1118 [inline]
copy_process+0x13f1/0x7400 kernel/fork.c:2327
kernel_clone+0xfd/0x930 kernel/fork.c:2909
kernel_thread+0xc0/0x100 kernel/fork.c:2971
create_kthread kernel/kthread.c:411 [inline]
kthreadd+0x4fc/0x7b0 kernel/kthread.c:746
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
page last free stack trace:
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---
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 syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title

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.

If you want to overwrite bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Marcelo Ricardo Leitner

unread,
Sep 14, 2023, 11:25:51 AM9/14/23
to syzbot, b...@alien8.de, bra...@kernel.org, dave....@linux.intel.com, h...@zytor.com, linux-...@vger.kernel.org, linux-...@vger.kernel.org, linux...@vger.kernel.org, lucie...@gmail.com, mi...@redhat.com, net...@vger.kernel.org, reiserf...@vger.kernel.org, syzkall...@googlegroups.com, tg...@linutronix.de, x...@kernel.org
On Tue, Sep 05, 2023 at 10:55:01AM -0700, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: a47fc304d2b6 Add linux-next specific files for 20230831
> git tree: linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=131da298680000
> kernel config: https://syzkaller.appspot.com/x/.config?x=6ecd2a74f20953b9
> dashboard link: https://syzkaller.appspot.com/bug?extid=00f1a932d27258b183e7
> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=116e5fcba80000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=118e912fa80000

Not sure why sctp got tagged here. I could not find anything network
related on this reproducer or console output.

Marcelo

Alexander Potapenko

unread,
Sep 14, 2023, 12:06:43 PM9/14/23
to Marcelo Ricardo Leitner, syzbot, b...@alien8.de, bra...@kernel.org, dave....@linux.intel.com, h...@zytor.com, linux-...@vger.kernel.org, linux-...@vger.kernel.org, linux...@vger.kernel.org, lucie...@gmail.com, mi...@redhat.com, net...@vger.kernel.org, reiserf...@vger.kernel.org, syzkall...@googlegroups.com, tg...@linutronix.de, x...@kernel.org
I am afraid this is the effect of reports from different tools being
clustered together: https://github.com/google/syzkaller/issues/4168
The relevant KMSAN report can be viewed on the dashboard:
https://syzkaller.appspot.com/text?tag=CrashReport&x=144ba287a80000 -
that's where sctp was deduced from.

I suspect there's still nothing specific to sctp though: looks like
schedule_debug() somehow accidentally reads past the end of the task
stack.

> Marcelo
>
> --
> You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bug...@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/cbakbuszcnwtfkdavtif3lwfncelm2ugn6eyd5pd5dmdocxqh5%403op6br7uaxd7.



--
Alexander Potapenko
Software Engineer

Google Germany GmbH
Erika-Mann-Straße, 33
80636 München

Geschäftsführer: Paul Manicle, Liana Sebastian
Registergericht und -nummer: Hamburg, HRB 86891
Sitz der Gesellschaft: Hamburg

syzbot

unread,
Dec 10, 2023, 12:35:16 PM12/10/23
to syzkall...@googlegroups.com
Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.
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