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BUG: KASAN: out-of-bounds in instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
BUG: KASAN: out-of-bounds in atomic_dec include/linux/atomic/atomic-instrumented.h:257 [inline]
BUG: KASAN: out-of-bounds in put_bh include/linux/buffer_head.h:320 [inline]
BUG: KASAN: out-of-bounds in end_buffer_read_sync+0x85/0x90 fs/buffer.c:160
Write of size 4 at addr ffffc9000a76f860 by task ksoftirqd/1/21

CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 6.1.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x12a/0x1be lib/dump_stack.c:106
 print_address_description+0x74/0x340 mm/kasan/report.c:284
 print_report+0x107/0x1f0 mm/kasan/report.c:395
 kasan_report+0xcd/0x100 mm/kasan/report.c:495
 kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189
 instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
 atomic_dec include/linux/atomic/atomic-instrumented.h:257 [inline]
 put_bh include/linux/buffer_head.h:320 [inline]
 end_buffer_read_sync+0x85/0x90 fs/buffer.c:160
 end_bio_bh_io_sync+0x87/0xd0 fs/buffer.c:2655
 req_bio_endio block/blk-mq.c:762 [inline]
 blk_update_request+0x3c4/0x1040 block/blk-mq.c:894
 blk_mq_end_request+0x34/0x60 block/blk-mq.c:1021
 blk_complete_reqs block/blk-mq.c:1099 [inline]
 blk_done_softirq+0x95/0x140 block/blk-mq.c:1104
 __do_softirq+0x277/0x738 kernel/softirq.c:571
 run_ksoftirqd+0xa2/0x100 kernel/softirq.c:934
 smpboot_thread_fn+0x523/0x8c0 kernel/smpboot.c:164
 kthread+0x228/0x2a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffc9000a768000, ffffc9000a771000) created by:
 dup_task_struct+0x55/0x440 kernel/fork.c:974

The buggy address belongs to the physical page:
page:ffffea0001c487c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7121f
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 15816, tgid 15816 (syz-executor307), ts 595397793571, free_ts 593816635000
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4288
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5555
 vm_area_alloc_pages mm/vmalloc.c:2975 [inline]
 __vmalloc_area_node mm/vmalloc.c:3043 [inline]
 __vmalloc_node_range+0x66f/0xfb0 mm/vmalloc.c:3213
 alloc_thread_stack_node+0x27f/0x410 kernel/fork.c:311
 dup_task_struct+0x55/0x440 kernel/fork.c:974
 copy_process+0x401/0x3b90 kernel/fork.c:2084
 kernel_clone+0x15d/0x490 kernel/fork.c:2671
 __do_sys_clone kernel/fork.c:2812 [inline]
 __se_sys_clone kernel/fork.c:2796 [inline]
 __x64_sys_clone+0x223/0x280 kernel/fork.c:2796
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1459 [inline]
 free_pcp_prepare+0x80c/0x8f0 mm/page_alloc.c:1509
 free_unref_page_prepare mm/page_alloc.c:3387 [inline]
 free_unref_page_list+0xb4/0x7b0 mm/page_alloc.c:3529
 release_pages+0x1991/0x1b30 mm/swap.c:1055
 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:256 [inline]
 tlb_flush_mmu+0x6a4/0x8f0 mm/mmu_gather.c:263
 tlb_finish_mmu+0xad/0x1c0 mm/mmu_gather.c:363
 exit_mmap+0x260/0x570 mm/mmap.c:3101
 __mmput+0xca/0x300 kernel/fork.c:1185
 exit_mm+0x1cd/0x280 kernel/exit.c:516
 do_exit+0x537/0x1c80 kernel/exit.c:807
 do_group_exit+0x1b0/0x280 kernel/exit.c:950
 __do_sys_exit_group kernel/exit.c:961 [inline]
 __se_sys_exit_group kernel/exit.c:959 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:959
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffffc9000a76f700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000a76f780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000a76f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                          ^
 ffffc9000a76f880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000a76f900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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