==================================================================
BUG: KCSAN: data-race in mem_cgroup_select_victim_node / mem_cgroup_select_victim_node

write to 0xffff8880a9faa9b0 of 4 bytes by task 14142 on cpu 0:
 mem_cgroup_select_victim_node+0xb5/0x3d0 mm/memcontrol.c:1686
 try_to_free_mem_cgroup_pages+0x175/0x4c0 mm/vmscan.c:3374
 reclaim_high.constprop.0+0xf7/0x140 mm/memcontrol.c:2349
 mem_cgroup_handle_over_high+0x96/0x180 mm/memcontrol.c:2430
 tracehook_notify_resume include/linux/tracehook.h:197 [inline]
 exit_to_usermode_loop+0x20c/0x2c0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode+0x180/0x1a0 arch/x86/entry/common.c:194
 swapgs_restore_regs_and_return_to_usermode+0x0/0x40

read to 0xffff8880a9faa9b0 of 4 bytes by task 8190 on cpu 1:
 mem_cgroup_select_victim_node+0x92/0x3d0 mm/memcontrol.c:1675
 try_to_free_mem_cgroup_pages+0x175/0x4c0 mm/vmscan.c:3374
 reclaim_high.constprop.0+0xf7/0x140 mm/memcontrol.c:2349
 mem_cgroup_handle_over_high+0x96/0x180 mm/memcontrol.c:2430
 tracehook_notify_resume include/linux/tracehook.h:197 [inline]
 exit_to_usermode_loop+0x20c/0x2c0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode+0x180/0x1a0 arch/x86/entry/common.c:194
 swapgs_restore_regs_and_return_to_usermode+0x0/0x40

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8190 Comm: syz-executor.4 Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 8190 Comm: syz-executor.4 Not tainted 5.4.0-rc6+ #0
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+0xf5/0x159 lib/dump_stack.c:113
 panic+0x210/0x640 kernel/panic.c:221
 kcsan_report.cold+0xc/0xe kernel/kcsan/report.c:302
 kcsan_setup_watchpoint+0x3fe/0x410 kernel/kcsan/core.c:357
 check_access kernel/kcsan/core.c:409 [inline]
 __tsan_read4+0x145/0x1f0 kernel/kcsan/core.c:529
 mem_cgroup_select_victim_node+0x92/0x3d0 mm/memcontrol.c:1675
 try_to_free_mem_cgroup_pages+0x175/0x4c0 mm/vmscan.c:3374
 reclaim_high.constprop.0+0xf7/0x140 mm/memcontrol.c:2349
 mem_cgroup_handle_over_high+0x96/0x180 mm/memcontrol.c:2430
 tracehook_notify_resume include/linux/tracehook.h:197 [inline]
 exit_to_usermode_loop+0x20c/0x2c0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode+0x180/0x1a0 arch/x86/entry/common.c:194
 retint_user+0x8/0x8
RIP: 0033:0x45894a
Code: 48 85 db 74 b6 41 bc ca 00 00 00 eb 0c 0f 1f 00 48 8b 5b 08 48 85 db 74 a2 48 8b 3b 48 8b 47 10 48 85 c0 74 05 ff d0 48 8b 3b <f0> ff 4f 28 0f 94 c0 84 c0 74 db 8b 47 2c 85 c0 74 d4 45 31 d2 ba
RSP: 002b:00007ffdf37969b0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00007ffdf37969b0 RCX: 00000000004587ea
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000a76d48
RBP: 00007ffdf37969f0 R08: 0000000000000001 R09: 0000000002382940
R10: 0000000002382c10 R11: 0000000000000246 R12: 00000000000000ca
R13: 000000000000016f R14: 0000000000000000 R15: 00007ffdf3796a40
Kernel Offset: disabled
Rebooting in 86400 seconds..