syzbot

Unable to handle kernel paging request at virtual address dfff800000000000
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000000] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4428 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline]
pc : set_buffer_uptodate include/linux/buffer_head.h:148 [inline]
pc : do_journal_end+0xce0/0x3bb0 fs/reiserfs/journal.c:4083
lr : __getblk include/linux/buffer_head.h:411 [inline]
lr : do_journal_end+0xcd8/0x3bb0 fs/reiserfs/journal.c:4080
sp : ffff800020b47560
x29: ffff800020b47790 x28: ffff0000d7a56000 x27: ffff0000d7a56678
x26: ffff0000d7a56678 x25: ffff800020ed9048 x24: ffff0000df5a300f
x23: ffff0000d7a56018 x22: 0000000000000000 x21: 0000000000000012
x20: ffff0000c058b700 x19: dfff800000000000 x18: ffff800011a5bd40
x17: ffff800018184000 x16: ffff8000082e9244 x15: ffff800017c65000
x14: ffff0000ddebddd8 x13: ffff0000ddebde50 x12: 0000000000ff0100
x11: ff00800008a80900 x10: 0000000000000000 x9 : ffff800008a80900
x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000020 x4 : 0000000000000008 x3 : ffff800008a806c8
x2 : 0000000000000001 x1 : 0000000000000003 x0 : 0000000000000000
Call trace:
 __getblk include/linux/buffer_head.h:411 [inline]
 do_journal_end+0xce0/0x3bb0 fs/reiserfs/journal.c:4080
 journal_end_sync+0x164/0x1d0 fs/reiserfs/journal.c:3539
 reiserfs_sync_fs+0xd0/0x14c fs/reiserfs/super.c:78
 sync_filesystem+0xe8/0x218 fs/sync.c:56
 generic_shutdown_super+0x70/0x324 fs/super.c:474
 kill_block_super+0x70/0xdc fs/super.c:1470
 reiserfs_kill_sb+0x124/0x13c fs/reiserfs/super.c:570
 deactivate_locked_super+0xac/0x124 fs/super.c:332
 deactivate_super+0xe8/0x108 fs/super.c:363
 cleanup_mnt+0x37c/0x404 fs/namespace.c:1191
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1198
 task_work_run+0x1ec/0x270 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x2038/0x2b28 arch/arm64/kernel/signal.c:1137
 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+0x98/0x138 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: 52800103 97f6a71a d343fc08 aa0003f6 (38736908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	52800103 	mov	w3, #0x8                   	// #8
   4:	97f6a71a 	bl	0xffffffffffda9c6c
   8:	d343fc08 	lsr	x8, x0, #3
   c:	aa0003f6 	mov	x22, x0
* 10:	38736908 	ldrb	w8, [x8, x19] <-- trapping instruction