loop0: detected capacity change from 0 to 2048
EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: none.
Internal error: Oops - BTI: 0000000036000001 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4360 Comm: syz-executor.0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026
pstate: 42400405 (nZcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=jc)
pc : fault_in_readable+0x270/0x358 mm/gup.c:1801
lr : fault_in_readable+0x24c/0x358 mm/gup.c:1801
sp : ffff80001fd976f0
x29: ffff80001fd97710 x28: dfff800000000000 x27: 000000203f000000
x26: 00000000203f1000 x25: 00000000203f0000 x24: 00000000203f0000
x23: 00000000fffffff2 x22: ffff80001152be00 x21: 0000000000000000
x20: 000000000000000c x19: 00000000203f0000 x18: 0000000000000001
x17: 0000000000000000 x16: ffff8000087451cc x15: 0000000000006000
x14: 0000000000000001 x13: 1ffff0000287202b x12: 00000000f00b9ff0
x11: ff808000087451a8 x10: 0000000000000000 x9 : 0000000000000000
x8 : 00000000203f0000 x7 : ffff800008762580 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 fault_in_readable+0x270/0x358 mm/gup.c:1801
 fault_in_iov_iter_readable+0x128/0x258 lib/iov_iter.c:460
 generic_perform_write+0x14c/0x490 mm/filemap.c:3775
 ext4_buffered_write_iter+0x3fc/0x530 fs/ext4/file.c:268
 ext4_file_write_iter+0x69c/0x14a8 fs/ext4/file.c:-1
 call_write_iter include/linux/fs.h:2173 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x590/0xa64 fs/read_write.c:594
 ksys_write+0x12c/0x228 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:656
 __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: 381f43b5 2a1503f7 2a1503e0 38400909 (381f43a9) 
---[ end trace 40c8f9c66931e761 ]---
----------------
Code disassembly (best guess):
   0:	381f43b5 	sturb	w21, [x29, #-12]
   4:	2a1503f7 	mov	w23, w21
   8:	2a1503e0 	mov	w0, w21
   c:	38400909 	ldtrb	w9, [x8]
* 10:	381f43a9 	sturb	w9, [x29, #-12] <-- trapping instruction