================================================================== BUG: KCSAN: data-race in compaction_alloc / compaction_alloc write to 0xffff88823fff9288 of 8 bytes by task 11438 on cpu 1: update_pageblock_skip mm/compaction.c:460 [inline] isolate_freepages mm/compaction.c:1571 [inline] compaction_alloc+0x12a2/0x1540 mm/compaction.c:1624 unmap_and_move+0x113/0x690 mm/migrate.c:1189 migrate_pages+0x2ad/0xee0 mm/migrate.c:1459 compact_zone+0x1500/0x1d30 mm/compaction.c:2357 compact_node+0x128/0x1e0 mm/compaction.c:2633 compact_nodes mm/compaction.c:2649 [inline] sysctl_compaction_handler+0x47/0x90 mm/compaction.c:2670 proc_sys_call_handler+0x329/0x4e0 fs/proc/proc_sysctl.c:591 proc_sys_write+0x1e/0x30 fs/proc/proc_sysctl.c:617 call_write_iter include/linux/fs.h:1901 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x6d4/0x7c0 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+0x44/0xa9 read to 0xffff88823fff9288 of 8 bytes by task 11443 on cpu 0: update_pageblock_skip mm/compaction.c:459 [inline] isolate_freepages mm/compaction.c:1571 [inline] compaction_alloc+0x127e/0x1540 mm/compaction.c:1624 unmap_and_move+0x113/0x690 mm/migrate.c:1189 migrate_pages+0x2ad/0xee0 mm/migrate.c:1459 compact_zone+0x1500/0x1d30 mm/compaction.c:2357 compact_node+0x128/0x1e0 mm/compaction.c:2633 compact_nodes mm/compaction.c:2649 [inline] sysctl_compaction_handler+0x47/0x90 mm/compaction.c:2670 proc_sys_call_handler+0x329/0x4e0 fs/proc/proc_sysctl.c:591 proc_sys_write+0x1e/0x30 fs/proc/proc_sysctl.c:617 call_write_iter include/linux/fs.h:1901 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x6d4/0x7c0 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+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 11443 Comm: syz-executor.5 Not tainted 5.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================