__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590
Unable to handle kernel paging request at virtual address dfff800000000005
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
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, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0
[dfff800000000005] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 10365 Comm: syz.5.1362 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline]
pc : raid5_has_ppl drivers/md/raid5-log.h:54 [inline]
pc : log_exit drivers/md/raid5-log.h:128 [inline]
pc : free_conf+0x88/0x540 drivers/md/raid5.c:7549
lr : free_conf+0x34/0x540 drivers/md/raid5.c:7546
sp : ffff8000958374b0
x29: ffff8000958374c0 x28: ffff0000c8df2018 x27: ffff700012b06eb8
x26: ffff0000fe948000 x25: 1fffe0001fd29044 x24: ffff0000fe948000
x23: dfff800000000000 x22: 00000000fffffff4 x21: ffff0000fe948660
x20: 0000000000000028 x19: ffff0000fe948000 x18: 1fffe00035bac428
x17: 70202c31206c6176 x16: 0000000000000001 x15: 0000000000000000
x14: 000000000095ea9c x13: 0000000000000001 x12: 0000000000000000
x11: 0000000000000000 x10: 0000000000000003 x9 : 0000000000000000
x8 : 0000000000000005 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 00000000ffffffff x4 : 0000000000000dc0 x3 : 0000000000000080
x2 : 0000000000000030 x1 : ffff0000d398bb00 x0 : 0000000000000000
dump_backtrace(regs = 0000000031e10dc3 tsk = 0000000000000000)
Call trace:
 generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline] (P)
 raid5_has_ppl drivers/md/raid5-log.h:54 [inline] (P)
 log_exit drivers/md/raid5-log.h:128 [inline] (P)
 free_conf+0x88/0x540 drivers/md/raid5.c:7549 (P)
 setup_conf+0xb0c/0x1f38 drivers/md/raid5.c:7885
 raid5_run+0x670/0x1b68 drivers/md/raid5.c:8129
 md_run+0xb10/0x19e8 drivers/md/md.c:6779
 do_md_run+0x4c/0x4e4 drivers/md/md.c:6880
 array_state_store+0x7a8/0xce8 drivers/md/md.c:-1
 md_attr_store+0x304/0x438 drivers/md/md.c:6158
 sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:145
 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x51c/0xa0c fs/read_write.c:687
 ksys_write+0x12c/0x228 fs/read_write.c:739
 __do_sys_write fs/read_write.c:750 [inline]
 __se_sys_write fs/read_write.c:747 [inline]
 __arm64_sys_write+0x84/0x98 fs/read_write.c:747
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590
Code: 972f9708 f9400288 9100a114 d343fe88 (38776908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	972f9708 	bl	0xfffffffffcbe5c20
   4:	f9400288 	ldr	x8, [x20]
   8:	9100a114 	add	x20, x8, #0x28
   c:	d343fe88 	lsr	x8, x20, #3
* 10:	38776908 	ldrb	w8, [x8, x23] <-- trapping instruction