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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+0xc1/0xd0 fs/buffer.c:161
Write of size 4 at addr ffffc9000b9076c0 by task ksoftirqd/1/23

CPU: 1 PID: 23 Comm: ksoftirqd/1 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 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+0xc1/0xd0 fs/buffer.c:161
 end_bio_bh_io_sync+0xbf/0x120 fs/buffer.c:2756
 req_bio_endio block/blk-mq.c:791 [inline]
 blk_update_request+0x55d/0x1050 block/blk-mq.c:936
 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1059
 blk_complete_reqs block/blk-mq.c:1134 [inline]
 blk_done_softirq+0x100/0x150 block/blk-mq.c:1139
 __do_softirq+0x2bc/0x943 kernel/softirq.c:554
 run_ksoftirqd+0xc5/0x130 kernel/softirq.c:924
 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffc9000b900000, ffffc9000b909000) created by:
 copy_process+0x5d1/0x3df0 kernel/fork.c:2219

The buggy address belongs to the physical page:
page:ffffea0000af55c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2bd57
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
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 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 7064, tgid 7064 (syz-executor353), ts 174984207085, free_ts 159794166950
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533
 prep_new_page mm/page_alloc.c:1540 [inline]
 get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311
 __alloc_pages+0x256/0x680 mm/page_alloc.c:4569
 alloc_pages_mpol+0x3de/0x650 mm/mempolicy.c:2133
 vm_area_alloc_pages mm/vmalloc.c:3135 [inline]
 __vmalloc_area_node mm/vmalloc.c:3211 [inline]
 __vmalloc_node_range+0x9a4/0x14a0 mm/vmalloc.c:3392
 alloc_thread_stack_node kernel/fork.c:309 [inline]
 dup_task_struct+0x3e9/0x7d0 kernel/fork.c:1114
 copy_process+0x5d1/0x3df0 kernel/fork.c:2219
 kernel_clone+0x223/0x840 kernel/fork.c:2796
 __do_sys_clone3 kernel/fork.c:3097 [inline]
 __se_sys_clone3+0x2cb/0x350 kernel/fork.c:3081
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
page last free pid 6796 tgid 6796 stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1140 [inline]
 free_unref_page_prepare+0x95d/0xa80 mm/page_alloc.c:2346
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486
 mm_free_pgd kernel/fork.c:803 [inline]
 __mmdrop+0xb9/0x3d0 kernel/fork.c:919
 exit_mm+0x220/0x310 kernel/exit.c:569
 do_exit+0x99e/0x27e0 kernel/exit.c:865
 do_group_exit+0x207/0x2c0 kernel/exit.c:1027
 __do_sys_exit_group kernel/exit.c:1038 [inline]
 __se_sys_exit_group kernel/exit.c:1036 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

Memory state around the buggy address:
 ffffc9000b907580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000b907600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000b907680: 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 00 00 f2
                                              ^
 ffffc9000b907700: f2 f2 f2 f2 00 f2 f2 f2 01 f3 f3 f3 00 00 00 00
 ffffc9000b907780: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
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