BTRFS info (device loop0): scrub: started on devid 1
Unable to handle kernel paging request at virtual address dfff800000000041
KASAN: null-ptr-deref in range [0x0000000000000208-0x000000000000020f]
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
[dfff800000000041] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4469 Comm: syz.0.17 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 : find_first_extent_item+0xa8/0x6b4 fs/btrfs/scrub.c:3084
lr : find_first_extent_item+0x9c/0x6b4 fs/btrfs/scrub.c:3083
sp : ffff800021516f00
x29: ffff800021517000 x28: dfff800000000000 x27: dfff800000000000
x26: 0000000000100000 x25: ffff0000d29ca210 x24: ffff800021516f40
x23: 0000000000400000 x22: 0000000000000208 x21: ffff7000042a2de8
x20: 0000000000000000 x19: ffff8000215172d0 x18: ffff800011a5bd40
x17: ffff800018184000 x16: ffff8000082e9244 x15: ffff8000089e05f0
x14: ffff800009ff9ca0 x13: 1ffff00002a0a0b1 x12: 0000000000ff0100
x11: ff0080000a09362c x10: 0000000000000000 x9 : ffff80000a09362c
x8 : 0000000000000041 x7 : ffff80000a09122c x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000400000
x2 : 0000000000100000 x1 : ffff8000215172d0 x0 : 0000000000000000
Call trace:
find_first_extent_item+0xa8/0x6b4 fs/btrfs/scrub.c:3084
scrub_simple_mirror+0x4a8/0x1128 fs/btrfs/scrub.c:3452
scrub_stripe+0x7c8/0x1498 fs/btrfs/scrub.c:3665
scrub_chunk+0x290/0x364 fs/btrfs/scrub.c:3800
scrub_enumerate_chunks+0x934/0x1300 fs/btrfs/scrub.c:4069
btrfs_scrub_dev+0x640/0xedc fs/btrfs/scrub.c:4410
btrfs_ioctl_scrub+0x1dc/0x3d0 fs/btrfs/ioctl.c:4109
btrfs_ioctl+0xa1c/0xbd0 fs/btrfs/ioctl.c:5564
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
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: 97903eb6 91082296 f90017f4 d343fec8 (387c6908)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 97903eb6 bl 0xfffffffffe40fad8
4: 91082296 add x22, x20, #0x208
8: f90017f4 str x20, [sp, #40]
c: d343fec8 lsr x8, x22, #3
* 10: 387c6908 ldrb w8, [x8, x28] <-- trapping instruction