From: syzbot <syzbot+77e4f005cb899d4268d1-Pl5Pbv+GP7P466ipTTIvnc23WoclnBCfAL8bYrjMMd8@public.gmane.org>
To: konishi.ryusuke-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-nilfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
syzkaller-bugs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
Subject: [syzbot] BUG: unable to handle kernel NULL pointer dereference in lock_page
Date: Fri, 28 Oct 2022 13:42:44 -0700 [thread overview]
Message-ID: <000000000000c8457f05ec1e4c69@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: bbed346d5a96 Merge branch 'for-next/core' into for-kernelci
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=100804a6880000
kernel config: https://syzkaller.appspot.com/x/.config?x=3a4a45d2d827c1e
dashboard link: https://syzkaller.appspot.com/bug?extid=77e4f005cb899d4268d1
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111fa5f2880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13687212880000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e8e91bc79312/disk-bbed346d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c1cb3fb3b77e/vmlinux-bbed346d.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/c8d7f5e1917f/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+77e4f005cb899d4268d1-Pl5Pbv+GP7P466ipTTIvnc23WoclnBCfAL8bYrjMMd8@public.gmane.org
NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000168
Mem abort info:
ESR = 0x0000000096000004
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x04: level 0 translation fault
Data abort info:
ISV = 0, ISS = 0x00000004
CM = 0, WnR = 0
user pgtable: 4k pages, 48-bit VAs, pgdp=0000000108bcf000
[0000000000000168] pgd=0000000000000000, p4d=0000000000000000
Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 3032 Comm: segctord Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : _compound_head include/linux/page-flags.h:253 [inline]
pc : lock_page+0x28/0x1e0 include/linux/pagemap.h:958
lr : lock_page+0x28/0x1e0 include/linux/pagemap.h:956
sp : ffff80001290bc00
x29: ffff80001290bc00 x28: ffff80001290bde0 x27: 000000000000001b
x26: fffffc000330d7c0 x25: ffff0000caa56d68 x24: ffff0000ca9fb1c0
x23: 0000000000000080 x22: ffff0000ca9fb130 x21: 0000000000000160
x20: ffff0000c91e10b8 x19: 0000000000000160 x18: 00000000000000c0
x17: ffff80000dd0b198 x16: ffff80000db49158 x15: ffff0000c3e63500
x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c3e63500
x11: ff808000095d1a0c x10: 0000000000000000 x9 : 0000000000000000
x8 : 0000000000000000 x7 : ffff80000856806c x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000000 x3 : 0000000000000000
x2 : 0000000000000000 x1 : ffff80000cb431b1 x0 : 0000000000000000
Call trace:
lock_page+0x28/0x1e0 include/linux/pagemap.h:956
nilfs_segctor_prepare_write+0x6c/0x21c fs/nilfs2/segment.c:1658
nilfs_segctor_do_construct+0x9f4/0xee8 fs/nilfs2/segment.c:2068
nilfs_segctor_construct+0xa0/0x380 fs/nilfs2/segment.c:2375
nilfs_segctor_thread_construct fs/nilfs2/segment.c:2483 [inline]
nilfs_segctor_thread+0x180/0x660 fs/nilfs2/segment.c:2566
kthread+0x12c/0x158 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860
Code: 9001df80 912a5000 52807781 97c7bd0e (f9400674)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 9001df80 adrp x0, 0x3bf0000
4: 912a5000 add x0, x0, #0xa94
8: 52807781 mov w1, #0x3bc // #956
c: 97c7bd0e bl 0xffffffffff1ef444
* 10: f9400674 ldr x20, [x19, #8] <-- trapping instruction
---
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-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
next reply other threads:[~2022-10-28 20:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-28 20:42 syzbot [this message]
[not found] ` <000000000000c8457f05ec1e4c69-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2022-12-01 11:29 ` [syzbot] BUG: unable to handle kernel NULL pointer dereference in lock_page Ryusuke Konishi
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