================================================================== BUG: KASAN: slab-out-of-bounds in __read_once_size include/linux/compiler.h:188 [inline] BUG: KASAN: slab-out-of-bounds in list_empty include/linux/list.h:203 [inline] BUG: KASAN: slab-out-of-bounds in shrink_slab_memcg mm/vmscan.c:595 [inline] BUG: KASAN: slab-out-of-bounds in shrink_slab+0xa04/0xa60 mm/vmscan.c:671 Read of size 8 at addr ffff88019ac40d58 by task syz-executor1/2058 CPU: 0 PID: 2058 Comm: syz-executor1 Not tainted 4.18.0-rc4-next-20180713+ #7 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __read_once_size include/linux/compiler.h:188 [inline] list_empty include/linux/list.h:203 [inline] shrink_slab_memcg mm/vmscan.c:595 [inline] shrink_slab+0xa04/0xa60 mm/vmscan.c:671 shrink_node+0x429/0x16a0 mm/vmscan.c:2735 shrink_zones mm/vmscan.c:2964 [inline] do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3026 try_to_free_mem_cgroup_pages+0x49d/0xc90 mm/vmscan.c:3324 memory_high_write+0x283/0x310 mm/memcontrol.c:5611 cgroup_file_write+0x31f/0x840 kernel/cgroup/cgroup.c:3502 kernfs_fop_write+0x2ba/0x480 fs/kernfs/file.c:316 __vfs_write+0x117/0x9d0 fs/read_write.c:485 vfs_write+0x1fc/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffb718efc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ffb718f06d4 RCX: 0000000000455ab9 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000017 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c2c77 R14: 00000000004d4c80 R15: 0000000000000000 Allocated by task 995: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3689 kmalloc_node include/linux/slab.h:555 [inline] kvmalloc_node+0xb9/0xf0 mm/util.c:423 kvmalloc include/linux/mm.h:557 [inline] kvzalloc include/linux/mm.h:565 [inline] __kvm_set_memory_region+0x11a5/0x2e60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1015 __x86_set_memory_region+0x3ca/0x890 arch/x86/kvm/x86.c:8818 x86_set_memory_region+0x3e/0x60 arch/x86/kvm/x86.c:8835 kvm_arch_destroy_vm+0x66e/0x7c0 arch/x86/kvm/x86.c:8850 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:746 [inline] kvm_put_kvm+0x73f/0x1060 arch/x86/kvm/../../../virt/kvm/kvm_main.c:767 kvm_vcpu_release+0x7b/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2397 __fput+0x35d/0x930 fs/file_table.c:252 ____fput+0x15/0x20 fs/file_table.c:288 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 get_signal+0x1557/0x1970 kernel/signal.c:2297 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 995: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 kvfree+0x61/0x70 mm/util.c:442 __kvm_set_memory_region+0x1c1f/0x2e60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1059 __x86_set_memory_region+0x3ca/0x890 arch/x86/kvm/x86.c:8818 x86_set_memory_region+0x3e/0x60 arch/x86/kvm/x86.c:8835 kvm_arch_destroy_vm+0x66e/0x7c0 arch/x86/kvm/x86.c:8850 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:746 [inline] kvm_put_kvm+0x73f/0x1060 arch/x86/kvm/../../../virt/kvm/kvm_main.c:767 kvm_vcpu_release+0x7b/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2397 __fput+0x35d/0x930 fs/file_table.c:252 ____fput+0x15/0x20 fs/file_table.c:288 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 get_signal+0x1557/0x1970 kernel/signal.c:2297 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88019ac4a880 which belongs to the cache kmalloc-65536 of size 65536 The buggy address is located 39720 bytes to the left of 65536-byte region [ffff88019ac4a880, ffff88019ac5a880) The buggy address belongs to the page: page:ffffea00066b1000 count:1 mapcount:0 mapping:ffff8801da802500 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea000615b808 ffffea0006787808 ffff8801da802500 raw: 0000000000000000 ffff88019ac4a880 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88019ac40c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88019ac40c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88019ac40d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88019ac40d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88019ac40e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================