==================================================================
BUG: KASAN: out-of-bounds in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: out-of-bounds in atomic_dec include/linux/atomic/atomic-instrumented.h:244 [inline]
BUG: KASAN: out-of-bounds in put_bh include/linux/buffer_head.h:319 [inline]
BUG: KASAN: out-of-bounds in end_buffer_read_sync+0x3c/0x94 fs/buffer.c:160
Write of size 4 at addr ffff8000263275c0 by task ksoftirqd/1/20

CPU: 1 PID: 20 Comm: ksoftirqd/1 Not tainted 5.15.115-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 kasan_check_range+0x274/0x2b4 mm/kasan/generic.c:189
 __kasan_check_write+0x44/0x54 mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 atomic_dec include/linux/atomic/atomic-instrumented.h:244 [inline]
 put_bh include/linux/buffer_head.h:319 [inline]
 end_buffer_read_sync+0x3c/0x94 fs/buffer.c:160
 end_bio_bh_io_sync+0xb0/0x1b4 fs/buffer.c:3007
 bio_endio+0x780/0x7c4 block/bio.c:1476
 req_bio_endio block/blk-core.c:261 [inline]
 blk_update_request+0x79c/0x1304 block/blk-core.c:1447
 blk_mq_end_request+0x54/0x88 block/blk-mq.c:575
 lo_complete_rq+0x140/0x258 drivers/block/loop.c:529
 blk_complete_reqs block/blk-mq.c:587 [inline]
 blk_done_softirq+0x11c/0x168 block/blk-mq.c:592
 __do_softirq+0x344/0xe20 kernel/softirq.c:558
 run_ksoftirqd+0x68/0x258 kernel/softirq.c:920
 smpboot_thread_fn+0x4b0/0x920 kernel/smpboot.c:164
 kthread+0x37c/0x45c kernel/kthread.c:319
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870


Memory state around the buggy address:
 ffff800026327480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff800026327500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff800026327580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                              ^
 ffff800026327600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff800026327680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
vkms_vblank_simulate: vblank timer overrun
vkms_vblank_simulate: vblank timer overrun
vkms_vblank_simulate: vblank timer overrun
vkms_vblank_simulate: vblank timer overrun
vkms_vblank_simulate: vblank timer overrun
vkms_vblank_simulate: vblank timer overrun
vkms_vblank_simulate: vblank timer overrun
vkms_vblank_simulate: vblank timer overrun
vkms_vblank_simulate: vblank timer overrun
vkms_vblank_simulate: vblank timer overrun
vkms_vblank_simulate: vblank timer overrun