================================================================== BUG: KCSAN: data-race in isolate_migratepages_block / isolate_migratepages_block write to 0xffff88823fff9290 of 8 bytes by task 3496 on cpu 1: update_cached_migrate mm/compaction.c:434 [inline] isolate_migratepages_block+0x1964/0x1c90 mm/compaction.c:1122 isolate_migratepages mm/compaction.c:1892 [inline] compact_zone+0x1597/0x1e60 mm/compaction.c:2342 compact_node+0x128/0x1e0 mm/compaction.c:2641 compact_nodes mm/compaction.c:2657 [inline] sysctl_compaction_handler+0x47/0x90 mm/compaction.c:2678 proc_sys_call_handler+0x3dd/0x530 fs/proc/proc_sysctl.c:591 proc_sys_write+0x1e/0x30 fs/proc/proc_sysctl.c:617 call_write_iter include/linux/fs.h:1977 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x6f9/0x7e0 fs/read_write.c:605 ksys_write+0xce/0x180 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:667 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88823fff9290 of 8 bytes by task 3490 on cpu 0: update_cached_migrate mm/compaction.c:433 [inline] isolate_migratepages_block+0x1940/0x1c90 mm/compaction.c:1122 isolate_migratepages mm/compaction.c:1892 [inline] compact_zone+0x1597/0x1e60 mm/compaction.c:2342 compact_node+0x128/0x1e0 mm/compaction.c:2641 compact_nodes mm/compaction.c:2657 [inline] sysctl_compaction_handler+0x47/0x90 mm/compaction.c:2678 proc_sys_call_handler+0x3dd/0x530 fs/proc/proc_sysctl.c:591 proc_sys_write+0x1e/0x30 fs/proc/proc_sysctl.c:617 call_write_iter include/linux/fs.h:1977 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x6f9/0x7e0 fs/read_write.c:605 ksys_write+0xce/0x180 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:667 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 3490 Comm: syz-executor.3 Not tainted 5.12.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================