================================================================== BUG: KASAN: stack-out-of-bounds in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: stack-out-of-bounds in atomic_dec include/linux/atomic/atomic-instrumented.h:592 [inline] BUG: KASAN: stack-out-of-bounds in put_bh include/linux/buffer_head.h:306 [inline] BUG: KASAN: stack-out-of-bounds in end_buffer_read_sync+0x8f/0xe0 fs/buffer.c:161 Write of size 4 at addr ffffc90003dbf898 by task ksoftirqd/0/16 CPU: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.7.0-rc1-syzkaller-00019-gc42d9eeef8e5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 check_region_inline mm/kasan/generic.c:181 [inline] kasan_check_range+0xef/0x190 mm/kasan/generic.c:187 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:306 [inline] end_buffer_read_sync+0x8f/0xe0 fs/buffer.c:161 end_bio_bh_io_sync+0xdd/0x130 fs/buffer.c:2775 bio_endio+0x596/0x6a0 block/bio.c:1603 req_bio_endio block/blk-mq.c:788 [inline] blk_update_request+0x67b/0x1700 block/blk-mq.c:933 blk_mq_end_request+0x57/0x520 block/blk-mq.c:1056 lo_complete_rq+0x232/0x2f0 drivers/block/loop.c:370 blk_complete_reqs+0xb2/0xf0 block/blk-mq.c:1131 __do_softirq+0x21a/0x8de kernel/softirq.c:553 run_ksoftirqd kernel/softirq.c:921 [inline] run_ksoftirqd+0x31/0x60 kernel/softirq.c:913 smpboot_thread_fn+0x660/0xa10 kernel/smpboot.c:164 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 The buggy address belongs to the virtual mapping at [ffffc90003db8000, ffffc90003dc1000) created by: kernel_clone+0xfd/0x930 kernel/fork.c:2907 The buggy address belongs to the physical page: page:ffffea0001d98e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76638 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 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 14397, tgid 14397 (syz-executor406), ts 608870944386, free_ts 604886396413 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0xa25/0x36d0 mm/page_alloc.c:3312 __alloc_pages+0x22e/0x2420 mm/page_alloc.c:4568 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133 vm_area_alloc_pages mm/vmalloc.c:3063 [inline] __vmalloc_area_node mm/vmalloc.c:3139 [inline] __vmalloc_node_range+0xa6e/0x1540 mm/vmalloc.c:3320 alloc_thread_stack_node kernel/fork.c:309 [inline] dup_task_struct kernel/fork.c:1118 [inline] copy_process+0x138b/0x73f0 kernel/fork.c:2332 kernel_clone+0xfd/0x930 kernel/fork.c:2907 __do_sys_clone+0xba/0x100 kernel/fork.c:3050 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1137 [inline] free_unref_page_prepare+0x4fa/0xaa0 mm/page_alloc.c:2347 free_unref_page_list+0xe6/0xb40 mm/page_alloc.c:2533 release_pages+0x32a/0x14f0 mm/swap.c:1042 tlb_batch_pages_flush+0x9a/0x190 mm/mmu_gather.c:98 tlb_flush_mmu_free mm/mmu_gather.c:293 [inline] tlb_flush_mmu mm/mmu_gather.c:300 [inline] tlb_finish_mmu+0x14b/0x6f0 mm/mmu_gather.c:392 exit_mmap+0x38b/0xa70 mm/mmap.c:3321 __mmput+0x12a/0x4d0 kernel/fork.c:1349 mmput+0x62/0x70 kernel/fork.c:1371 exit_mm kernel/exit.c:567 [inline] do_exit+0x9ad/0x2ae0 kernel/exit.c:858 do_group_exit+0xd4/0x2a0 kernel/exit.c:1021 __do_sys_exit_group kernel/exit.c:1032 [inline] __se_sys_exit_group kernel/exit.c:1030 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1030 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b Memory state around the buggy address: ffffc90003dbf780: f1 f1 f1 f1 00 f3 f3 f3 00 00 00 00 00 00 00 00 ffffc90003dbf800: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f2 >ffffc90003dbf880: 04 f2 00 f2 f2 f2 00 f3 f3 f3 00 00 00 00 00 00 ^ ffffc90003dbf900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90003dbf980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 ==================================================================