================================================================== BUG: KCSAN: data-race in mem_cgroup_select_victim_node / mem_cgroup_select_victim_node read to 0xffff8880aa86a9b0 of 4 bytes by task 19855 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 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 write to 0xffff8880aa86a9b0 of 4 bytes by task 23076 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 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 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 23076 Comm: syz-executor.0 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: 0 PID: 23076 Comm: syz-executor.0 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_unaligned_write4+0x143/0x1f0 kernel/kcsan/core.c:529 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 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 RIP: 0033:0x4587ea Code: Bad RIP value. RSP: 002b:00007ffc8f725e40 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: 0000000000000000 RBX: 00007ffc8f725e40 RCX: 00000000004587ea RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffc8f725e80 R08: 0000000000000001 R09: 00000000023eb940 R10: 00000000023ebc10 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffc8f725ed0 Kernel Offset: disabled Rebooting in 86400 seconds..