syzbot

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BUG: KASAN: slab-out-of-bounds in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: slab-out-of-bounds in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
BUG: KASAN: slab-out-of-bounds in mapping_release_always include/linux/pagemap.h:279 [inline]
BUG: KASAN: slab-out-of-bounds in folio_needs_release mm/internal.h:187 [inline]
BUG: KASAN: slab-out-of-bounds in shrink_folio_list+0x2dbf/0x3e60 mm/vmscan.c:2067
Read of size 8 at addr ffff888073b01c91 by task syz-executor235/5027

CPU: 0 PID: 5027 Comm: syz-executor235 Not tainted 6.4.0-next-20230707-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:364
 print_report mm/kasan/report.c:475 [inline]
 kasan_report+0x11d/0x130 mm/kasan/report.c:588
 check_region_inline mm/kasan/generic.c:181 [inline]
 kasan_check_range+0xf0/0x190 mm/kasan/generic.c:187
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 mapping_release_always include/linux/pagemap.h:279 [inline]
 folio_needs_release mm/internal.h:187 [inline]
 shrink_folio_list+0x2dbf/0x3e60 mm/vmscan.c:2067
 reclaim_folio_list+0xd0/0x390 mm/vmscan.c:2801
 reclaim_pages+0x442/0x670 mm/vmscan.c:2837
 madvise_cold_or_pageout_pte_range+0x100e/0x1ee0 mm/madvise.c:533
 walk_pmd_range mm/pagewalk.c:140 [inline]
 walk_pud_range mm/pagewalk.c:218 [inline]
 walk_p4d_range mm/pagewalk.c:253 [inline]
 walk_pgd_range+0x9e7/0x1470 mm/pagewalk.c:290
 __walk_page_range+0x651/0x780 mm/pagewalk.c:392
 walk_page_range+0x311/0x4a0 mm/pagewalk.c:490
 madvise_pageout_page_range mm/madvise.c:591 [inline]
 madvise_pageout+0x2fe/0x560 mm/madvise.c:618
 madvise_vma_behavior+0x61a/0x21a0 mm/madvise.c:1039
 madvise_walk_vmas+0x1c7/0x2b0 mm/madvise.c:1268
 do_madvise.part.0+0x276/0x490 mm/madvise.c:1448
 do_madvise mm/madvise.c:1461 [inline]
 __do_sys_madvise mm/madvise.c:1461 [inline]
 __se_sys_madvise mm/madvise.c:1459 [inline]
 __x64_sys_madvise+0x117/0x150 mm/madvise.c:1459
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa47b2e7c29
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff44b700f8 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007fa47b355ed0 RCX: 00007fa47b2e7c29
RDX: 0000000000000015 RSI: 0000000000600000 RDI: 0000000020000000
RBP: 00007fff44b70118 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff44b70120
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 5020:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:762 [inline]
 slab_alloc_node mm/slub.c:3470 [inline]
 slab_alloc mm/slub.c:3478 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3485 [inline]
 kmem_cache_alloc+0x173/0x390 mm/slub.c:3494
 anon_vma_alloc mm/rmap.c:94 [inline]
 anon_vma_fork+0xe2/0x630 mm/rmap.c:361
 dup_mmap+0xc0f/0x14b0 kernel/fork.c:732
 dup_mm kernel/fork.c:1694 [inline]
 copy_mm kernel/fork.c:1743 [inline]
 copy_process+0x6663/0x75c0 kernel/fork.c:2509
 kernel_clone+0xeb/0x890 kernel/fork.c:2917
 __do_sys_clone+0xba/0x100 kernel/fork.c:3060
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888073b01bb0
 which belongs to the cache anon_vma of size 208
The buggy address is located 17 bytes to the right of
 allocated 208-byte region [ffff888073b01bb0, ffff888073b01c80)

The buggy address belongs to the physical page:
page:ffffea0001cec040 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888073b01330 pfn:0x73b01
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000200 ffff888014674140 ffffea0000a76800 dead000000000002
raw: ffff888073b01330 00000000800f000b 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 4996, tgid 4996 (dhcpcd-run-hook), ts 46734776618, free_ts 15354551624
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1569
 prep_new_page mm/page_alloc.c:1576 [inline]
 get_page_from_freelist+0xfd9/0x2c40 mm/page_alloc.c:3256
 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4512
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279
 alloc_slab_page mm/slub.c:1862 [inline]
 allocate_slab+0x25f/0x390 mm/slub.c:2009
 new_slab mm/slub.c:2062 [inline]
 ___slab_alloc+0xbc3/0x15d0 mm/slub.c:3215
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3314
 __slab_alloc_node mm/slub.c:3367 [inline]
 slab_alloc_node mm/slub.c:3460 [inline]
 slab_alloc mm/slub.c:3478 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3485 [inline]
 kmem_cache_alloc+0x371/0x390 mm/slub.c:3494
 anon_vma_alloc mm/rmap.c:94 [inline]
 anon_vma_fork+0xe2/0x630 mm/rmap.c:361
 dup_mmap+0xc0f/0x14b0 kernel/fork.c:732
 dup_mm kernel/fork.c:1694 [inline]
 copy_mm kernel/fork.c:1743 [inline]
 copy_process+0x6663/0x75c0 kernel/fork.c:2509
 kernel_clone+0xeb/0x890 kernel/fork.c:2917
 __do_sys_clone+0xba/0x100 kernel/fork.c:3060
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 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:1160 [inline]
 free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2383
 free_unref_page+0x33/0x370 mm/page_alloc.c:2478
 free_contig_range+0xb5/0x180 mm/page_alloc.c:6427
 destroy_args+0x6bd/0x910 mm/debug_vm_pgtable.c:1029
 debug_vm_pgtable+0x1f7c/0x3e50 mm/debug_vm_pgtable.c:1410
 do_one_initcall+0x105/0x630 init/main.c:1232
 do_initcall_level init/main.c:1294 [inline]
 do_initcalls init/main.c:1310 [inline]
 do_basic_setup init/main.c:1329 [inline]
 kernel_init_freeable+0x64e/0xba0 init/main.c:1546
 kernel_init+0x1e/0x2c0 init/main.c:1437
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Memory state around the buggy address:
 ffff888073b01b80: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00
 ffff888073b01c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888073b01c80: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
                         ^
 ffff888073b01d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888073b01d80: 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 00 00
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