linux-kernel - [syzbot] [jfs?] BUG: unable to handle kernel paging request in diUpdatePMap

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Message-ID: <690d9fd4.a70a0220.22f260.0022.GAE@google.com>
Date: Thu, 06 Nov 2025 23:29:24 -0800
From: syzbot <syzbot+7fc112f7a4a0546731c5@...kaller.appspotmail.com>
To: jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org, 
	shaggy@...nel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [jfs?] BUG: unable to handle kernel paging request in diUpdatePMap

Hello,

syzbot found the following issue on:

HEAD commit:    dcb6fa37fd7b Linux 6.18-rc3
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=1451a532580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b8b659f0cab27b22
dashboard link: https://syzkaller.appspot.com/bug?extid=7fc112f7a4a0546731c5
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17fc5812580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=110f3012580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ae6bec0d0398/disk-dcb6fa37.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/dcc732da66c3/vmlinux-dcb6fa37.xz
kernel image: https://storage.googleapis.com/syzbot-assets/301d1bbdecc2/Image-dcb6fa37.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/94e5a8b9504e/mount_0.gz
  fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=1051a532580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7fc112f7a4a0546731c5@...kaller.appspotmail.com

Unable to handle kernel paging request at virtual address fbd5200000000021
KASAN: maybe wild-memory-access in range [0xdead000000000108-0xdead00000000010f]
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, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[fbd5200000000021] address between user and kernel address ranges
Internal error: Oops: 0000000096000004 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 100 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 834000c5 (Nzcv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : __list_add_valid_or_report+0x3c/0x148 lib/list_debug.c:29
lr : __list_add_valid include/linux/list.h:96 [inline]
lr : __list_add include/linux/list.h:158 [inline]
lr : list_add include/linux/list.h:177 [inline]
lr : diUpdatePMap+0x4e8/0xb90 fs/jfs/jfs_imap.c:2831
sp : ffff800099e67b50
x29: ffff800099e67b50 x28: dfff800000000000 x27: 00000000c0000000
x26: 0000000000000000 x25: dead000000000100 x24: 1bd5a00000000021
x23: dfff800000000000 x22: dead000000000108 x21: ffff0000e21152f8
x20: ffff80009b403120 x19: dead000000000100 x18: 0000000000000000
x17: ffff80010ca0e000 x16: ffff800080536ef4 x15: ffff7000133ccf58
x14: 1ffff000133ccf58 x13: 0000000000000004 x12: ffffffffffffffff
x11: ffff7000133ccf58 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : 0000000000000000 x7 : ffff800081c11594 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff80008053700c
x2 : dead000000000100 x1 : ffff80009b403120 x0 : ffff0000e21152f8
Call trace:
 __list_add_valid_or_report+0x3c/0x148 lib/list_debug.c:29 (P)
 __list_add_valid include/linux/list.h:96 [inline]
 __list_add include/linux/list.h:158 [inline]
 list_add include/linux/list.h:177 [inline]
 diUpdatePMap+0x4e8/0xb90 fs/jfs/jfs_imap.c:2831
 txUpdateMap+0x708/0x8d0 fs/jfs/jfs_txnmgr.c:2357
 txLazyCommit fs/jfs/jfs_txnmgr.c:2665 [inline]
 jfs_lazycommit+0x394/0x94c fs/jfs/jfs_txnmgr.c:2734
 kthread+0x5fc/0x75c kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
Code: aa0103f4 d343fed8 f2fbfff7 aa0003f5 (38776b08) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	aa0103f4 	mov	x20, x1
   4:	d343fed8 	lsr	x24, x22, #3
   8:	f2fbfff7 	movk	x23, #0xdfff, lsl #48
   c:	aa0003f5 	mov	x21, x0
* 10:	38776b08 	ldrb	w8, [x24, x23] <-- 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@...glegroups.com.

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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
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#syz undup