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BUG: KASAN: out-of-bounds in instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
BUG: KASAN: out-of-bounds in atomic_dec include/linux/atomic/atomic-instrumented.h:592 [inline]
BUG: KASAN: out-of-bounds in put_bh include/linux/buffer_head.h:303 [inline]
BUG: KASAN: out-of-bounds in end_buffer_read_sync+0xe4/0x190 fs/buffer.c:161
Write of size 4 at addr ffff80009f7c73c0 by task ksoftirqd/1/23

CPU: 1 PID: 23 Comm: ksoftirqd/1 Not tainted 6.9.0-rc4-syzkaller-g6a71d2909427 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x198/0x538 mm/kasan/report.c:488
 kasan_report+0xd8/0x138 mm/kasan/report.c:601
 kasan_check_range+0x268/0x2a8 mm/kasan/generic.c:189
 __kasan_check_write+0x20/0x30 mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
 atomic_dec include/linux/atomic/atomic-instrumented.h:592 [inline]
 put_bh include/linux/buffer_head.h:303 [inline]
 end_buffer_read_sync+0xe4/0x190 fs/buffer.c:161
 end_bio_bh_io_sync+0xb0/0x194 fs/buffer.c:2756
 bio_endio+0x770/0x7b4 block/bio.c:1603
 req_bio_endio block/blk-mq.c:786 [inline]
 blk_update_request+0x4ac/0xdf0 block/blk-mq.c:931
 blk_mq_end_request+0x54/0x88 block/blk-mq.c:1054
 lo_complete_rq+0x188/0x2f4 drivers/block/loop.c:366
 blk_complete_reqs block/blk-mq.c:1129 [inline]
 blk_done_softirq+0x11c/0x168 block/blk-mq.c:1134
 __do_softirq+0x2e4/0xd2c kernel/softirq.c:554
 run_ksoftirqd+0x6c/0x14c kernel/softirq.c:924
 smpboot_thread_fn+0x4b0/0x90c kernel/smpboot.c:164
 kthread+0x288/0x310 kernel/kthread.c:388
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860

The buggy address belongs to the virtual mapping at
 [ffff80009f7c0000, ffff80009f7c9000) created by:
 copy_process+0x490/0x3280 kernel/fork.c:2219

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1141f8
memcg:ffff0000cdee4482
flags: 0x5ffe00000000000(node=0|zone=2|lastcpupid=0xfff)
page_type: 0xffffffff()
raw: 05ffe00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff0000cdee4482
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff80009f7c7280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff80009f7c7300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff80009f7c7380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                              ^
 ffff80009f7c7400: f1 f1 f1 f1 00 00 00 00 00 00 00 f2 f2 f2 f2 f2
 ffff80009f7c7480: 00 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
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