linux-kernel - Re: [syzbot] [mm?] kernel BUG in PageHuge

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Message-ID: <fd667164-5a8d-44ca-8d22-9ff5ccd8c884@redhat.com>
Date: Mon, 25 Mar 2024 11:16:25 +0100
From: David Hildenbrand <david@...hat.com>
To: syzbot <syzbot+adb570fc6161d33edb01@...kaller.appspotmail.com>,
 akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 muchun.song@...ux.dev, syzkaller-bugs@...glegroups.com
Cc: Matthew Wilcox <willy@...radead.org>
Subject: Re: [syzbot] [mm?] kernel BUG in PageHuge

On 25.03.24 06:42, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    707081b61156 Merge branch 'for-next/core', remote-tracking..
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> console output: https://syzkaller.appspot.com/x/log.txt?x=155105be180000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=caeac3f3565b057a
> dashboard link: https://syzkaller.appspot.com/bug?extid=adb570fc6161d33edb01
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> userspace arch: arm64
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/6cad68bf7532/disk-707081b6.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/1a27e5400778/vmlinux-707081b6.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/67dfc53755d0/Image-707081b6.gz.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+adb570fc6161d33edb01@...kaller.appspotmail.com
> 
> ------------[ cut here ]------------
> kernel BUG at include/linux/page-flags.h:314!
> Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
> Modules linked in:
> CPU: 0 PID: 12282 Comm: syz-executor.2 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
> pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> pc : folio_flags include/linux/page-flags.h:314 [inline]
> pc : folio_test_hugetlb include/linux/page-flags.h:849 [inline]
> pc : PageHuge+0x1f8/0x1fc mm/hugetlb.c:2173
> lr : folio_flags include/linux/page-flags.h:314 [inline]
> lr : folio_test_hugetlb include/linux/page-flags.h:849 [inline]
> lr : PageHuge+0x1f8/0x1fc mm/hugetlb.c:2173
> sp : ffff800097ca6d00
> x29: ffff800097ca6d00 x28: dfff800000000000 x27: fffffdffc318ac00
> x26: 00000000000000b0 x25: fffffdffc3188000 x24: 05ffc00000000840
> x23: 1fffffbff8631580 x22: 1fffffbff8631581 x21: dfff800000000000
> x20: 05ffc00000000000 x19: fffffdffc318ac00 x18: 1fffe000367fff96
> x17: ffff80008ec9d000 x16: ffff80008ad6b09c x15: 0000000000000001
> x14: 1ffff00012f94ce4 x13: 0000000000000000 x12: 0000000000000000
> x11: 0000000000040000 x10: 000000000003ffff x9 : ffff80009a5da000
> x8 : 0000000000040000 x7 : ffff800080297c0c x6 : 0000000000000000
> x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff800082f248d0
> x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000166
> Call trace:
>   folio_flags include/linux/page-flags.h:314 [inline]
>   folio_test_hugetlb include/linux/page-flags.h:849 [inline]
>   PageHuge+0x1f8/0x1fc mm/hugetlb.c:2173
>   isolate_migratepages_block+0x7d8/0x2f9c mm/compaction.c:950
>   isolate_migratepages mm/compaction.c:2074 [inline]
>   compact_zone+0x26a8/0x4120 mm/compaction.c:2530
>   compact_node+0x234/0x3c0 mm/compaction.c:2851
>   compact_nodes mm/compaction.c:2864 [inline]
>   sysctl_compaction_handler+0x110/0x1d4 mm/compaction.c:2910
>   proc_sys_call_handler+0x4cc/0x7cc fs/proc/proc_sysctl.c:595
>   proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:621
>   call_write_iter include/linux/fs.h:2087 [inline]
>   iter_file_splice_write+0x894/0xfc0 fs/splice.c:743
>   do_splice_from fs/splice.c:941 [inline]
>   direct_splice_actor+0xec/0x1d8 fs/splice.c:1164
>   splice_direct_to_actor+0x438/0xa0c fs/splice.c:1108
>   do_splice_direct_actor fs/splice.c:1207 [inline]
>   do_splice_direct+0x1e4/0x304 fs/splice.c:1233
>   do_sendfile+0x460/0xb3c fs/read_write.c:1295
>   __do_sys_sendfile64 fs/read_write.c:1356 [inline]
>   __se_sys_sendfile64 fs/read_write.c:1348 [inline]
>   __arm64_sys_sendfile64+0x23c/0x3b4 fs/read_write.c:1348
>   __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
>   invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
>   el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
>   do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
>   el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
>   el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
>   el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
> Code: f0052f01 912c0021 aa1303e0 97fbce80 (d4210000)
> ---[ end trace 0000000000000000 ]---
> 
> 
> ---
> 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

#syz fix: mm: turn folio_test_hugetlb into a PageType

-- 
Cheers,

David / dhildenb