================================================================== BUG: KCSAN: data-race in __lru_add_drain_all / folio_mark_accessed read-write to 0xffff888237c27ba8 of 1 bytes by task 3695 on cpu 0: pagevec_add include/linux/pagevec.h:75 [inline] pagevec_add_and_need_flush mm/swap.c:234 [inline] folio_activate mm/swap.c:354 [inline] folio_mark_accessed+0x1fe/0x380 mm/swap.c:436 mark_page_accessed+0x3b/0xe0 mm/folio-compat.c:50 shmem_file_read_iter+0x27d/0x6a0 mm/shmem.c:2571 call_read_iter include/linux/fs.h:2044 [inline] new_sync_read fs/read_write.c:401 [inline] vfs_read+0x5a5/0x6a0 fs/read_write.c:482 ksys_read+0xe8/0x1a0 fs/read_write.c:620 __do_sys_read fs/read_write.c:630 [inline] __se_sys_read fs/read_write.c:628 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:628 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888237c27ba8 of 1 bytes by task 1828 on cpu 1: pagevec_count include/linux/pagevec.h:62 [inline] need_activate_page_drain mm/swap.c:342 [inline] __lru_add_drain_all+0x229/0x3e0 mm/swap.c:831 lru_add_drain_all+0xc/0x10 mm/swap.c:849 invalidate_bdev block/bdev.c:87 [inline] __invalidate_device+0x98/0xc0 block/bdev.c:1011 disk_force_media_change+0x110/0x180 block/disk-events.c:310 __loop_clr_fd+0x4cf/0x640 drivers/block/loop.c:1156 loop_clr_fd drivers/block/loop.c:1230 [inline] lo_ioctl+0xa12/0x11b0 drivers/block/loop.c:1556 blkdev_ioctl+0x20e/0x440 block/ioctl.c:588 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:856 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00 -> 0x01 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 1828 Comm: syz-executor.1 Not tainted 5.18.0-rc3-syzkaller-00016-gb253435746d9-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================