BTRFS info (device loop0): using spread ssd allocation scheme
BTRFS info (device loop0): disk space caching is enabled
BTRFS info (device loop0): has skinny extents
BTRFS error (device loop0): ignoredatacsums must be used with ro mount option
Unable to handle kernel paging request at virtual address dfff800000000000
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: 1 PID: 4755 Comm: syz.0.15 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : backup_super_roots fs/btrfs/disk-io.c:1984 [inline]
pc : write_all_supers+0xd08/0x3718 fs/btrfs/disk-io.c:4131
lr : lowmem_page_address include/linux/mm.h:1623 [inline]
lr : btrfs_header_level fs/btrfs/ctree.h:2194 [inline]
lr : backup_super_roots fs/btrfs/disk-io.c:1982 [inline]
lr : write_all_supers+0xc38/0x3718 fs/btrfs/disk-io.c:4131
sp : ffff80001f8a72a0
x29: ffff80001f8a7600 x28: ffff0000d565c040 x27: ffff800013d88000
x26: 1ffff000027b11a4 x25: dfff800000000000 x24: 1fffe0001aacb808
x23: 0000000000000000 x22: dfff800000000000 x21: ffff0000d2080b2b
x20: ffff0000d2080bc7 x19: 0000000000000000 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082dc158 x15: 0000000000000000
x14: 0000000000000003 x13: 0000000000000000 x12: ffff60001a41017b
x11: ff80800009eb7740 x10: 0000000000000000 x9 : ffff0000d565c000
x8 : 0000000000000000 x7 : 0000000000000000 x6 : 000000000000003f
x5 : 0000000000000040 x4 : ffffffffffffffd0 x3 : 0000000000000010
x2 : 0000000000000003 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 backup_super_roots fs/btrfs/disk-io.c:1984 [inline]
 write_all_supers+0xd08/0x3718 fs/btrfs/disk-io.c:4131
 btrfs_commit_transaction+0x16e8/0x30ac fs/btrfs/transaction.c:2465
 btrfs_set_free_space_cache_v1_active+0x78/0x228 fs/btrfs/free-space-cache.c:4001
 btrfs_remount_cleanup fs/btrfs/super.c:1913 [inline]
 btrfs_remount+0x5e0/0x12ac fs/btrfs/super.c:2116
 legacy_reconfigure+0xfc/0x114 fs/fs_context.c:634
 reconfigure_super+0x1d0/0x6c4 fs/super.c:938
 do_remount fs/namespace.c:2697 [inline]
 path_mount+0xd20/0xfe8 fs/namespace.c:3356
 do_mount fs/namespace.c:3377 [inline]
 __do_sys_mount fs/namespace.c:3585 [inline]
 __se_sys_mount fs/namespace.c:3562 [inline]
 __arm64_sys_mount+0x488/0x5f8 fs/namespace.c:3562
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x28c arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x5c/0x140 arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1d0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: 91010120 97a6626b f9400393 d343fe68 (38766908) 
---[ end trace 165b55678191bae9 ]---
----------------
Code disassembly (best guess):
   0:	91010120 	add	x0, x9, #0x40
   4:	97a6626b 	bl	0xfffffffffe9989b0
   8:	f9400393 	ldr	x19, [x28]
   c:	d343fe68 	lsr	x8, x19, #3
* 10:	38766908 	ldrb	w8, [x8, x22] <-- trapping instruction