linux-kernel - [syzbot] BUG: unable to handle kernel paging request in dquot_add

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Message-ID: <00000000000026532c05eb8a7ce2@google.com>
Date:   Fri, 21 Oct 2022 05:21:44 -0700
From:   syzbot <syzbot+60faec7a78ed9879d6b9@...kaller.appspotmail.com>
To:     jack@...e.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] BUG: unable to handle kernel paging request in dquot_add_inodes

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=15ea75d2880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3a4a45d2d827c1e
dashboard link: https://syzkaller.appspot.com/bug?extid=60faec7a78ed9879d6b9
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

Unfortunately, I don't have any reproducer for this issue yet.

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+60faec7a78ed9879d6b9@...kaller.appspotmail.com

EXT4-fs (loop0): mounted filesystem without journal. Quota mode: writeback.
Unable to handle kernel paging request at virtual address 00000001000000e7
Mem abort info:
  ESR = 0x0000000096000005
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x05: level 1 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000005
  CM = 0, WnR = 0
user pgtable: 4k pages, 48-bit VAs, pgdp=0000000133af2000
[00000001000000e7] pgd=0800000135e12003, p4d=0800000135e12003, pud=0000000000000000
Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 8925 Comm: syz-executor.0 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: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __lock_acquire+0x60/0x30a4 kernel/locking/lockdep.c:4923
lr : lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666
sp : ffff800015adb3d0
x29: ffff800015adb4b0 x28: 0000000000000000 x27: 0000000000000000
x26: 00000001000000e7 x25: ffff8000086bb660 x24: 0000000000000000
x23: 0000000000000000 x22: 00000001000000e7 x21: 0000000000000000
x20: 0000000000000000 x19: 0000000000000000 x18: 00000000000000c0
x17: ffff80000dd0b198 x16: ffff80000db49158 x15: ffff0000e3f44f80
x14: ffff80000dd0b198 x13: ffff80000db49158 x12: 0000000000040000
x11: 0000000000001abd x10: ffff800012e18000 x9 : 0000000000000001
x8 : 0000000000000001 x7 : ffff8000086bb660 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 00000001000000e7
Call trace:
 __lock_acquire+0x60/0x30a4 kernel/locking/lockdep.c:4923
 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x54/0x6c kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:349 [inline]
 dquot_add_inodes+0x38/0x36c fs/quota/dquot.c:1285
 dquot_alloc_inode+0xdc/0x434 fs/quota/dquot.c:1751
 ext4_xattr_inode_alloc_quota fs/ext4/xattr.c:888 [inline]
 ext4_xattr_set_entry+0x294/0xe28 fs/ext4/xattr.c:1661
 ext4_xattr_block_set+0x3d4/0x142c fs/ext4/xattr.c:1971
 ext4_xattr_set_handle+0x724/0x994 fs/ext4/xattr.c:2394
 ext4_xattr_set+0x100/0x1d0 fs/ext4/xattr.c:2495
 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x250/0x260 fs/xattr.c:182
 __vfs_setxattr_noperm+0xcc/0x320 fs/xattr.c:216
 __vfs_setxattr_locked+0x16c/0x194 fs/xattr.c:277
 vfs_setxattr+0x174/0x280 fs/xattr.c:313
 do_setxattr fs/xattr.c:600 [inline]
 setxattr fs/xattr.c:623 [inline]
 path_setxattr+0x354/0x414 fs/xattr.c:642
 __do_sys_setxattr fs/xattr.c:658 [inline]
 __se_sys_setxattr fs/xattr.c:654 [inline]
 __arm64_sys_setxattr+0x2c/0x40 fs/xattr.c:654
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636
 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: 2a0303f4 2a0203f7 aa0003fa 34000148 (f9400348) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	2a0303f4 	mov	w20, w3
   4:	2a0203f7 	mov	w23, w2
   8:	aa0003fa 	mov	x26, x0
   c:	34000148 	cbz	w8, 0x34
* 10:	f9400348 	ldr	x8, [x26] <-- trapping instruction


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