EXT4-fs (loop5): mounted filesystem without journal. Quota mode: none.
Unable to handle kernel paging request at virtual address ffffffffffffffec
KASAN: maybe wild-memory-access in range [0x0003ffffffffff60-0x0003ffffffffff67]
Mem abort info:
  ESR = 0x0000000096000004
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x04: level 0 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000004
  CM = 0, WnR = 0
swapper pgtable: 4k pages, 48-bit VAs, pgdp=000000020dfcc000
[ffffffffffffffec] pgd=0000000000000000, p4d=0000000000000000
Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 7672 Comm: syz.5.646 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : ext4_ext_drop_refs fs/ext4/extents.c:119 [inline]
pc : ext4_free_ext_path fs/ext4/extents.c:128 [inline]
pc : ext4_ext_map_blocks+0x2a70/0x570c fs/ext4/extents.c:4497
lr : ext4_ext_map_blocks+0x1528/0x570c fs/ext4/extents.c:4438
sp : ffff8000216a6e00
x29: ffff8000216a7080 x28: dfff800000000000 x27: 0000000000000001
x26: ffff8000216a72c0 x25: 0000000000000001 x24: 0000000000000001
x23: 0000000000000001 x22: 0000000000000002 x21: 0000000000000021
x20: ffff8000216a72c0 x19: ffffffffffffffe4 x18: 0000000000000000
x17: ffff80001835a000 x16: ffff8000082d7db8 x15: 0000000000000002
x14: 0000000000000001 x13: 1fffe0001c04b646 x12: 0000000000080000
x11: 0000000000051b10 x10: ffff8000335ec000 x9 : d0418267926c8800
x8 : 0000000000000000 x7 : 000000000000001c x6 : 0000000000000000
x5 : 0000000000000000 x4 : ffff0000e0241658 x3 : ffff800008a90998
x2 : 0000000000000001 x1 : 0000000000000000 x0 : ffffffffffffffec
Call trace:
 ext4_ext_drop_refs fs/ext4/extents.c:119 [inline]
 ext4_free_ext_path fs/ext4/extents.c:128 [inline]
 ext4_ext_map_blocks+0x2a70/0x570c fs/ext4/extents.c:4497
 ext4_map_blocks+0x860/0x1778 fs/ext4/inode.c:679
 _ext4_get_block+0x19c/0x4d8 fs/ext4/inode.c:822
 ext4_get_block+0x4c/0x60 fs/ext4/inode.c:839
 ext4_block_write_begin+0x50c/0x10e4 fs/ext4/inode.c:1124
 ext4_write_begin+0x5f4/0x131c fs/ext4/ext4_jbd2.h:-1
 ext4_da_write_begin+0x348/0x990 fs/ext4/inode.c:3000
 generic_perform_write+0x234/0x4f4 mm/filemap.c:3862
 ext4_buffered_write_iter+0x2c4/0x528 fs/ext4/file.c:285
 ext4_file_write_iter+0x18c/0x1574 fs/ext4/file.c:-1
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x3ec/0x7f0 fs/read_write.c:584
 ksys_write+0x12c/0x224 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
 __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: 2a1803fb d343fc08 38fc6908 35006ba8 (79401276) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	2a1803fb 	mov	w27, w24
   4:	d343fc08 	lsr	x8, x0, #3
   8:	38fc6908 	ldrsb	w8, [x8, x28]
   c:	35006ba8 	cbnz	w8, 0xd80
* 10:	79401276 	ldrh	w22, [x19, #8] <-- trapping instruction