================================================================== BUG: KCSAN: data-race in __lru_cache_add / lru_add_drain_all read to 0xffff88812c0299e0 of 1 bytes by task 14525 on cpu 1: lru_add_drain_all+0x17e/0x3d0 mm/swap.c:746 migrate_prep+0x17/0x20 mm/migrate.c:72 do_mbind+0x302/0xa40 mm/mempolicy.c:1282 kernel_mbind+0x111/0x130 mm/mempolicy.c:1438 __do_sys_mbind mm/mempolicy.c:1445 [inline] __se_sys_mbind mm/mempolicy.c:1441 [inline] __x64_sys_mbind+0x89/0xb0 mm/mempolicy.c:1441 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff88812c0299e0 of 1 bytes by task 14500 on cpu 0: pagevec_add include/linux/pagevec.h:81 [inline] __lru_cache_add+0xbf/0x1d0 mm/swap.c:410 lru_cache_add_anon+0x9e/0x130 mm/swap.c:423 shmem_getpage_gfp+0x470/0x1390 mm/shmem.c:1885 shmem_fault+0x114/0x470 mm/shmem.c:2067 __do_fault+0xae/0x1f0 mm/memory.c:3188 do_read_fault mm/memory.c:3585 [inline] do_fault mm/memory.c:3714 [inline] handle_pte_fault mm/memory.c:3945 [inline] __handle_mm_fault+0x270d/0x2e00 mm/memory.c:4075 handle_mm_fault+0x21b/0x530 mm/memory.c:4112 faultin_page mm/gup.c:640 [inline] __get_user_pages+0x485/0x1130 mm/gup.c:851 populate_vma_page_range+0xe6/0x100 mm/gup.c:1235 __mm_populate+0x168/0x2a0 mm/gup.c:1283 mm_populate include/linux/mm.h:2347 [inline] vm_mmap_pgoff+0x181/0x190 mm/util.c:511 ksys_mmap_pgoff+0x99/0x420 mm/mmap.c:1607 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0x2e/0x40 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 14500 Comm: syz-executor.5 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================