From: syzbot <syzbot+ea8b28e8dca42fc3bcbe@syzkaller.appspotmail.com>
To: asmadeus@codewreck.org, davem@davemloft.net, edumazet@google.com,
ericvh@gmail.com, kuba@kernel.org, linux-kernel@vger.kernel.org,
linux_oss@crudebyte.com, lucho@ionkov.net,
netdev@vger.kernel.org, pabeni@redhat.com,
syzkaller-bugs@googlegroups.com,
v9fs-developer@lists.sourceforge.net
Subject: Re: [syzbot] BUG: unable to handle kernel paging request in p9_client_disconnect
Date: Thu, 05 Jan 2023 21:38:48 -0800 [thread overview]
Message-ID: <000000000000f238aa05f191d4d6@google.com> (raw)
In-Reply-To: <000000000000cad14205ee10ec87@google.com>
syzbot has found a reproducer for the following issue on:
HEAD commit: 247f34f7b803 Linux 6.1-rc2
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=145dcb52480000
kernel config: https://syzkaller.appspot.com/x/.config?x=fa9bed8d6a8992a0
dashboard link: https://syzkaller.appspot.com/bug?extid=ea8b28e8dca42fc3bcbe
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=1360a90c480000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1580e9e6480000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/05f9a7fca332/disk-247f34f7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ec50c3ad7d48/vmlinux-247f34f7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1446f94b11ed/Image-247f34f7.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ea8b28e8dca42fc3bcbe@syzkaller.appspotmail.com
Unable to handle kernel paging request at virtual address 0032503900080052
Mem abort info:
ESR = 0x0000000096000044
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 = 0x00000044
CM = 0, WnR = 1
[0032503900080052] address between user and kernel address ranges
Internal error: Oops: 0000000096000044 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 3076 Comm: syz-executor424 Not tainted 6.1.0-rc2-syzkaller-154433-g247f34f7b803 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : p9_client_disconnect+0x1c/0x30 net/9p/client.c:1067
lr : p9_client_disconnect+0x18/0x30 net/9p/client.c:1065
sp : ffff800012e43ca0
x29: ffff800012e43ca0 x28: ffff0000cb48cec0 x27: 0000000000000000
x26: 00000000000000c0 x25: 0000000000000002 x24: ffff80000d37d050
x23: ffff80000d379000 x22: 0000000000000000 x21: 0000000000000000
x20: ffff0000cc82cf00 x19: 3032503900080002 x18: 0000000000000035
x17: 4553006964623d4d x16: 0000000000000000 x15: 0000000000000000
x14: 0000000000000000 x13: ffff0000c5860c18 x12: ffff0000ccb854d8
x11: ff8080000be7a520 x10: 0000000000000000 x9 : ffff80000be7a520
x8 : 0000000000000002 x7 : 0000000000000000 x6 : ffff80000c0374d8
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff0000cb48cec0 x1 : 0000000000000000 x0 : 3032503900080002
Call trace:
p9_client_disconnect+0x1c/0x30
v9fs_session_cancel+0x20/0x30 fs/9p/v9fs.c:530
v9fs_kill_super+0x2c/0x50 fs/9p/vfs_super.c:225
deactivate_locked_super+0x70/0xe8 fs/super.c:331
deactivate_super+0xd0/0xd4 fs/super.c:362
cleanup_mnt+0x184/0x1c0 fs/namespace.c:1186
__cleanup_mnt+0x20/0x30 fs/namespace.c:1193
task_work_run+0x100/0x148 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
do_notify_resume+0x174/0x1f0 arch/arm64/kernel/signal.c:1127
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
Code: 910003fd aa0003f3 9710b2fd 52800048 (b9005268)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 910003fd mov x29, sp
4: aa0003f3 mov x19, x0
8: 9710b2fd bl 0xfffffffffc42cbfc
c: 52800048 mov w8, #0x2 // #2
* 10: b9005268 str w8, [x19, #80] <-- trapping instruction
prev parent reply other threads:[~2023-01-06 5:38 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-22 15:35 [syzbot] BUG: unable to handle kernel paging request in p9_client_disconnect syzbot
2023-01-06 5:38 ` syzbot [this message]
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