================================================================== BUG: KASAN: slab-out-of-bounds in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] BUG: KASAN: slab-out-of-bounds in atomic_fetch_add_unless include/linux/atomic-fallback.h:1086 [inline] BUG: KASAN: slab-out-of-bounds in atomic_add_unless include/linux/atomic-fallback.h:1111 [inline] BUG: KASAN: slab-out-of-bounds in atomic_inc_not_zero include/linux/atomic-fallback.h:1127 [inline] BUG: KASAN: slab-out-of-bounds in page_get_anon_vma+0x24b/0x4b0 mm/rmap.c:477 Read of size 4 at addr ffff8880952d6638 by task kswapd0/1554 CPU: 0 PID: 1554 Comm: kswapd0 Not tainted 5.1.0-rc5+ #77 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 kasan_check_read+0x11/0x20 mm/kasan/common.c:102 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] atomic_fetch_add_unless include/linux/atomic-fallback.h:1086 [inline] atomic_add_unless include/linux/atomic-fallback.h:1111 [inline] atomic_inc_not_zero include/linux/atomic-fallback.h:1127 [inline] page_get_anon_vma+0x24b/0x4b0 mm/rmap.c:477 split_huge_page_to_list+0x58a/0x2de0 mm/huge_memory.c:2675 split_huge_page include/linux/huge_mm.h:148 [inline] deferred_split_scan+0x64b/0xa60 mm/huge_memory.c:2853 do_shrink_slab+0x400/0xa80 mm/vmscan.c:551 shrink_slab mm/vmscan.c:700 [inline] shrink_slab+0x4be/0x5e0 mm/vmscan.c:680 shrink_node+0x552/0x1570 mm/vmscan.c:2717 kswapd_shrink_node mm/vmscan.c:3471 [inline] balance_pgdat+0x56c/0xe80 mm/vmscan.c:3629 kswapd+0x5f4/0xfd0 mm/vmscan.c:3884 kthread+0x357/0x430 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Allocated by task 26422: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:505 slab_post_alloc_hook mm/slab.h:437 [inline] slab_alloc mm/slab.c:3393 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3555 kmem_cache_zalloc include/linux/slab.h:732 [inline] __delayacct_tsk_init+0x20/0x80 kernel/delayacct.c:45 delayacct_tsk_init include/linux/delayacct.h:112 [inline] copy_process.part.0+0x3535/0x7980 kernel/fork.c:1798 copy_process kernel/fork.c:1709 [inline] _do_fork+0x257/0xfd0 kernel/fork.c:2226 __do_sys_clone kernel/fork.c:2333 [inline] __se_sys_clone kernel/fork.c:2327 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2327 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 23358: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467 __cache_free mm/slab.c:3499 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3765 delayacct_tsk_free include/linux/delayacct.h:121 [inline] __put_task_struct+0x156/0x4e0 kernel/fork.c:726 put_task_struct include/linux/sched/task.h:98 [inline] delayed_put_task_struct+0x1ec/0x340 kernel/exit.c:181 __rcu_reclaim kernel/rcu/rcu.h:227 [inline] rcu_do_batch kernel/rcu/tree.c:2475 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2788 [inline] rcu_core+0x916/0x13a0 kernel/rcu/tree.c:2769 __do_softirq+0x266/0x95a kernel/softirq.c:293 The buggy address belongs to the object at ffff8880952d6578 which belongs to the cache task_delay_info(81:syz3) of size 136 The buggy address is located 56 bytes to the right of 136-byte region [ffff8880952d6578, ffff8880952d6600) The buggy address belongs to the page: page:ffffea000254b580 count:1 mapcount:0 mapping:ffff888088441640 index:0xffff8880952d67d0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000217b1c8 ffffea0002a3b408 ffff888088441640 raw: ffff8880952d67d0 ffff8880952d6000 000000010000000a ffff88805bc564c0 page dumped because: kasan: bad access detected page->mem_cgroup:ffff88805bc564c0 Memory state around the buggy address: ffff8880952d6500: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00 ffff8880952d6580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880952d6600: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8880952d6680: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc ffff8880952d6700: fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================