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

write to 0xffff8880b48f89b0 of 4 bytes by task 30526 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:3376
 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 arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath+0x20f/0x220 arch/x86/entry/common.c:274
 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:344

read to 0xffff8880b48f89b0 of 4 bytes by task 30525 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:3376
 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 arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x353/0x370 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 30525 Comm: syz-executor.1 Not tainted 5.4.0-rc3+ #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: 30525 Comm: syz-executor.1 Not tainted 5.4.0-rc3+ #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/0x10 kernel/kcsan/report.c:302
 __kcsan_setup_watchpoint+0x32e/0x4a0 kernel/kcsan/core.c:411
 __tsan_read4 kernel/kcsan/kcsan.c:35 [inline]
 __tsan_read4+0x2c/0x30 kernel/kcsan/kcsan.c:35
 mem_cgroup_select_victim_node+0x92/0x3d0 mm/memcontrol.c:1675
 try_to_free_mem_cgroup_pages+0x175/0x4c0 mm/vmscan.c:3376
 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 arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x353/0x370 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c919
Code: ff 48 85 f6 0f 84 d7 8c fb ff 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 0f 8c ae 8c fb ff 74 01 c3 31 ed 48 f7 c7 00 00 01 00 75
RSP: 002b:00007ffdb86bfdc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: 00000000000000cc RBX: 00007f6a7d4b6700 RCX: 000000000045c919
RDX: 00007f6a7d4b69d0 RSI: 00007f6a7d4b5db0 RDI: 00000000003d0f00
RBP: 00007ffdb86bffe0 R08: 00007f6a7d4b6700 R09: 00007f6a7d4b6700
R10: 00007f6a7d4b69d0 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffdb86bfe7f R14: 00007f6a7d4b69c0 R15: 000000000075bf2c
Kernel Offset: disabled
Rebooting in 86400 seconds..