================================================================== BUG: KCSAN: data-race in mm_update_next_owner / page_cache_ra_unbounded write to 0xffff88810e0c4024 of 4 bytes by task 28658 on cpu 0: memalloc_nofs_save include/linux/sched/mm.h:228 [inline] page_cache_ra_unbounded+0xae/0x4c0 mm/readahead.c:193 do_page_cache_ra mm/readahead.c:267 [inline] force_page_cache_ra+0x226/0x260 mm/readahead.c:298 page_cache_sync_ra+0x194/0x1c0 mm/readahead.c:572 page_cache_sync_readahead include/linux/pagemap.h:839 [inline] generic_file_buffered_read+0x38d/0x2110 mm/filemap.c:2227 generic_file_read_iter+0x80/0x3d0 mm/filemap.c:2535 blkdev_read_iter+0xb3/0xc0 fs/block_dev.c:1925 call_read_iter include/linux/fs.h:1881 [inline] new_sync_read fs/read_write.c:415 [inline] vfs_read+0x552/0x5c0 fs/read_write.c:496 ksys_read+0xce/0x180 fs/read_write.c:634 __do_sys_read fs/read_write.c:644 [inline] __se_sys_read fs/read_write.c:642 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:642 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88810e0c4024 of 4 bytes by task 28684 on cpu 1: mm_update_next_owner+0x1e9/0x4c0 kernel/exit.c:387 exit_mm+0x2b5/0x320 kernel/exit.c:482 do_exit+0x3c2/0x15a0 kernel/exit.c:793 do_group_exit+0x16f/0x170 kernel/exit.c:903 __do_sys_exit_group+0xb/0x10 kernel/exit.c:914 __se_sys_exit_group+0x5/0x10 kernel/exit.c:912 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:912 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: 1 PID: 28684 Comm: syz-executor.0 Not tainted 5.10.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================