NILFS (loop0): invalid segment: Checksum error in segment payload
NILFS (loop0): trying rollback from an earlier position
NILFS (loop0): recovery complete
Unable to handle kernel paging request at virtual address dfff800000000006
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
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
[dfff800000000006] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4473 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : nilfs_mdt_save_to_shadow_map+0x134/0x1b4 fs/nilfs2/mdt.c:549
lr : nilfs_mdt_save_to_shadow_map+0xcc/0x1b4 fs/nilfs2/mdt.c:545
sp : ffff800020e576c0
x29: ffff800020e576c0 x28: ffff7000041caef0 x27: dfff800000000000
x26: ffff0000d1e26678 x25: ffff800020e57a40 x24: ffff0000ea2d07c0
x23: dfff800000000000 x22: 0000000000000030 x21: ffff0000ea2d1050
x20: ffff0000d7a5ad40 x19: ffff0000ea2d0158 x18: 0000000000000000
x17: ffff800018349000 x16: ffff8000082d7ca0 x15: 0000000000000000
x14: 0000000000000406 x13: 0000000000ff0100 x12: 0000000000ff0100
x11: ff00800009c4f514 x10: 0000000000000000 x9 : ffff0000c2ca1bc0
x8 : 0000000000000006 x7 : ffff8000086f165c x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
nilfs_mdt_save_to_shadow_map+0x134/0x1b4 fs/nilfs2/mdt.c:549
nilfs_clean_segments+0x124/0x870 fs/nilfs2/segment.c:2512
nilfs_ioctl_clean_segments fs/nilfs2/ioctl.c:940 [inline]
nilfs_ioctl+0x22c0/0x2660 fs/nilfs2/ioctl.c:1304
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+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x128 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: 97b258b5 f94002c8 9100c116 d343fec8 (38776908)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 97b258b5 bl 0xfffffffffec962d4
4: f94002c8 ldr x8, [x22]
8: 9100c116 add x22, x8, #0x30
c: d343fec8 lsr x8, x22, #3
* 10: 38776908 ldrb w8, [x8, x23] <-- trapping instruction