linux-kernel - Re: [syzbot] [mm?] general protection fault in dequeue_hugetlb_folio

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Date: Wed, 12 Jun 2024 09:46:37 +0200
From: Oscar Salvador <osalvador@...e.de>
To: syzbot <syzbot+569ed13f4054f271087b@...kaller.appspotmail.com>
Cc: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, muchun.song@...ux.dev,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] general protection fault in
 dequeue_hugetlb_folio_nodemask (2)

On Tue, Jun 11, 2024 at 03:34:25AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    d35b2284e966 Add linux-next specific files for 20240607
> git tree:       linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=161352e2980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d8bf5cd6bcca7343
> dashboard link: https://syzkaller.appspot.com/bug?extid=569ed13f4054f271087b
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15eb5e86980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15db597e980000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/e0055a00a2cb/disk-d35b2284.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/192cbb8cf833/vmlinux-d35b2284.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/57804c9c9319/bzImage-d35b2284.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+569ed13f4054f271087b@...kaller.appspotmail.com
> 
> Oops: general protection fault, probably for non-canonical address 0xdffffc0000000489: 0000 [#1] PREEMPT SMP KASAN PTI
> KASAN: probably user-memory-access in range [0x0000000000002448-0x000000000000244f]
> CPU: 1 PID: 5095 Comm: syz-executor603 Not tainted 6.10.0-rc2-next-20240607-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
> RIP: 0010:zonelist_zone_idx include/linux/mmzone.h:1613 [inline]
> RIP: 0010:next_zones_zonelist include/linux/mmzone.h:1644 [inline]
> RIP: 0010:first_zones_zonelist include/linux/mmzone.h:1670 [inline]
> RIP: 0010:dequeue_hugetlb_folio_nodemask+0x193/0xe40 mm/hugetlb.c:1362
> Code: 93 7a a0 ff c7 44 24 14 00 00 00 00 83 7c 24 40 00 0f 85 97 0c 00 00 48 83 7c 24 20 00 0f 85 45 09 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 58 09 00 00 44 8b 33 44 89 f7 8b 5c 24
...
> 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@...glegroups.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 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.

#syz test: https://github.com/leberus/linux hugetlb-dequeue-numa


-- 
Oscar Salvador
SUSE Labs