================================================================== BUG: KCSAN: data-race in page_counter_try_charge / page_counter_try_charge write to 0xffff88821b672150 of 8 bytes by task 15021 on cpu 0: page_counter_try_charge+0x77/0x170 mm/page_counter.c:139 try_charge+0x17f/0xbe0 mm/memcontrol.c:2405 mem_cgroup_charge_skmem+0xd2/0x190 mm/memcontrol.c:6745 __sk_mem_raise_allocated+0x466/0xa10 net/core/sock.c:2502 __sk_mem_schedule+0x7a/0xd0 net/core/sock.c:2587 sk_wmem_schedule include/net/sock.h:1406 [inline] sctp_sendmsg_to_asoc+0xefa/0x13e0 net/sctp/socket.c:1818 sctp_sendmsg+0xbee/0x14f0 net/sctp/socket.c:2016 inet_sendmsg+0x69/0x90 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0x98/0xc0 net/socket.c:672 ____sys_sendmsg+0x493/0x4c0 net/socket.c:2343 ___sys_sendmsg+0xb5/0x100 net/socket.c:2397 __sys_sendmsg+0x9b/0x150 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x4c/0x60 net/socket.c:2437 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88821b672150 of 8 bytes by task 14967 on cpu 1: page_counter_try_charge+0x56/0x170 mm/page_counter.c:138 try_charge+0x17f/0xbe0 mm/memcontrol.c:2405 mem_cgroup_try_charge+0xd7/0x260 mm/memcontrol.c:6367 __add_to_page_cache_locked+0x16c/0x770 mm/filemap.c:844 add_to_page_cache_lru+0xc7/0x260 mm/filemap.c:921 pagecache_get_page+0x2b0/0x700 mm/filemap.c:1660 grab_cache_page_write_begin+0x56/0x80 mm/filemap.c:3237 ext4_da_write_begin+0x1b4/0x860 fs/ext4/inode.c:2966 generic_perform_write+0x13a/0x320 mm/filemap.c:3287 ext4_buffered_write_iter+0x14e/0x280 fs/ext4/file.c:270 ext4_file_write_iter+0xf4/0xd30 fs/ext4/file.c:642 call_write_iter include/linux/fs.h:1901 [inline] new_sync_write+0x303/0x400 fs/read_write.c:483 __vfs_write+0x9e/0xb0 fs/read_write.c:496 vfs_write fs/read_write.c:558 [inline] vfs_write+0x189/0x380 fs/read_write.c:542 ksys_write+0xc5/0x1a0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x49/0x60 fs/read_write.c:620 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 14967 Comm: syz-executor.2 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================