KCSAN: data-race in __zone_watermark_ok / get_page_from

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __zone_watermark_ok / get_page_from_freelist mm				24	1654d	1665d	0/26	closed as invalid on 2019/10/15 15:50

================================================================== BUG: KCSAN: data-race in __zone_watermark_ok / get_page_from_freelist write to 0xffff88812fffcf58 of 8 bytes by task 7382 on cpu 0: del_page_from_free_area include/linux/mmzone.h:151 [inline] __rmqueue_smallest mm/page_alloc.c:2191 [inline] __rmqueue mm/page_alloc.c:2711 [inline] rmqueue mm/page_alloc.c:3279 [inline] get_page_from_freelist+0xc87/0x2300 mm/page_alloc.c:3677 __alloc_pages_nodemask+0x255/0x4d0 mm/page_alloc.c:4714 alloc_pages_current+0xd1/0x170 mm/mempolicy.c:2153 alloc_pages include/linux/gfp.h:509 [inline] alloc_skb_with_frags+0x15c/0x3d0 net/core/skbuff.c:5658 sock_alloc_send_pskb+0x4da/0x510 net/core/sock.c:2232 unix_stream_sendmsg+0x2d5/0x690 net/unix/af_unix.c:1822 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0x9f/0xc0 net/socket.c:657 __sys_sendto+0x21f/0x320 net/socket.c:1952 __do_sys_sendto net/socket.c:1964 [inline] __se_sys_sendto net/socket.c:1960 [inline] __x64_sys_sendto+0x89/0xb0 net/socket.c:1960 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88812fffcf58 of 8 bytes by task 7383 on cpu 1: __zone_watermark_ok+0x106/0x240 mm/page_alloc.c:3444 zone_watermark_fast mm/page_alloc.c:3494 [inline] get_page_from_freelist+0x629/0x2300 mm/page_alloc.c:3635 __alloc_pages_nodemask+0x255/0x4d0 mm/page_alloc.c:4714 alloc_pages_current+0xd1/0x170 mm/mempolicy.c:2153 alloc_pages include/linux/gfp.h:509 [inline] alloc_skb_with_frags+0x15c/0x3d0 net/core/skbuff.c:5658 sock_alloc_send_pskb+0x4da/0x510 net/core/sock.c:2232 unix_stream_sendmsg+0x2d5/0x690 net/unix/af_unix.c:1822 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0x9f/0xc0 net/socket.c:657 __sys_sendto+0x21f/0x320 net/socket.c:1952 __do_sys_sendto net/socket.c:1964 [inline] __se_sys_sendto net/socket.c:1960 [inline] __x64_sys_sendto+0x89/0xb0 net/socket.c:1960 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 7383 Comm: syz-executor.0 Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================