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BUG: KCSAN: data-race in page_counter_try_charge / page_counter_try_charge

write to 0xffff88821b672150 of 8 bytes by task 18441 on cpu 1:
 page_counter_try_charge+0x7e/0x170 mm/page_counter.c:139
 try_charge+0x185/0xbf0 mm/memcontrol.c:2405
 mem_cgroup_try_charge+0xd2/0x260 mm/memcontrol.c:6367
 mem_cgroup_try_charge_delay+0x3a/0x80 mm/memcontrol.c:6382
 shmem_getpage_gfp+0x3bf/0x1390 mm/shmem.c:1872
 shmem_getpage mm/shmem.c:154 [inline]
 shmem_file_read_iter+0x224/0x720 mm/shmem.c:2565
 call_read_iter include/linux/fs.h:1895 [inline]
 new_sync_read+0x389/0x4f0 fs/read_write.c:414
 __vfs_read+0xb1/0xc0 fs/read_write.c:427
 vfs_read fs/read_write.c:461 [inline]
 vfs_read+0x143/0x2c0 fs/read_write.c:446
 kernel_read+0x79/0xb0 fs/read_write.c:440
 kernel_read_file fs/exec.c:936 [inline]
 kernel_read_file+0x202/0x3f0 fs/exec.c:899
 kernel_read_file_from_fd+0x6a/0xc0 fs/exec.c:997
 __do_sys_finit_module+0xaf/0x160 kernel/module.c:3973
 __se_sys_finit_module kernel/module.c:3956 [inline]
 __x64_sys_finit_module+0x47/0x60 kernel/module.c:3956
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88821b672150 of 8 bytes by task 18443 on cpu 0:
 page_counter_try_charge+0x58/0x170 mm/page_counter.c:138
 try_charge+0x185/0xbf0 mm/memcontrol.c:2405
 mem_cgroup_try_charge+0xd2/0x260 mm/memcontrol.c:6367
 mem_cgroup_try_charge_delay+0x3a/0x80 mm/memcontrol.c:6382
 shmem_getpage_gfp+0x3bf/0x1390 mm/shmem.c:1872
 shmem_getpage mm/shmem.c:154 [inline]
 shmem_file_read_iter+0x224/0x720 mm/shmem.c:2565
 call_read_iter include/linux/fs.h:1895 [inline]
 new_sync_read+0x389/0x4f0 fs/read_write.c:414
 __vfs_read+0xb1/0xc0 fs/read_write.c:427
 vfs_read fs/read_write.c:461 [inline]
 vfs_read+0x143/0x2c0 fs/read_write.c:446
 kernel_read+0x79/0xb0 fs/read_write.c:440
 kernel_read_file fs/exec.c:936 [inline]
 kernel_read_file+0x202/0x3f0 fs/exec.c:899
 kernel_read_file_from_fd+0x6a/0xc0 fs/exec.c:997
 __do_sys_finit_module+0xaf/0x160 kernel/module.c:3973
 __se_sys_finit_module kernel/module.c:3956 [inline]
 __x64_sys_finit_module+0x47/0x60 kernel/module.c:3956
 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: 18443 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
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