================================================================== BUG: KCSAN: data-race in __lru_cache_add / lru_add_drain_all write to 0xffff88812c029b60 of 1 bytes by task 10425 on cpu 0: pagevec_add include/linux/pagevec.h:81 [inline] __lru_cache_add+0xb8/0x1c0 mm/swap.c:410 lru_cache_add+0x1b/0x30 mm/swap.c:447 add_to_page_cache_lru+0x16b/0x260 mm/filemap.c:937 pagecache_get_page+0x2b0/0x700 mm/filemap.c:1660 grab_cache_page_write_begin+0x56/0x80 mm/filemap.c:3237 ext4_da_write_begin+0x1b4/0x860 fs/ext4/inode.c:2966 generic_perform_write+0x13a/0x320 mm/filemap.c:3287 ext4_buffered_write_iter+0x14e/0x280 fs/ext4/file.c:270 ext4_file_write_iter+0xf4/0xd30 fs/ext4/file.c:642 call_write_iter include/linux/fs.h:1901 [inline] new_sync_write+0x303/0x400 fs/read_write.c:483 __vfs_write+0x9e/0xb0 fs/read_write.c:496 vfs_write fs/read_write.c:558 [inline] vfs_write+0x189/0x380 fs/read_write.c:542 ksys_write+0xc5/0x1a0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x49/0x60 fs/read_write.c:620 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88812c029b60 of 1 bytes by task 10403 on cpu 1: lru_add_drain_all+0x169/0x3a0 mm/swap.c:746 invalidate_bdev+0x65/0x90 fs/block_dev.c:97 __loop_clr_fd+0x24e/0x710 drivers/block/loop.c:1140 loop_clr_fd drivers/block/loop.c:1237 [inline] lo_ioctl+0x24a/0xc80 drivers/block/loop.c:1606 __blkdev_driver_ioctl block/ioctl.c:321 [inline] blkdev_ioctl+0x1a1/0x420 block/ioctl.c:717 block_ioctl+0x91/0xb0 fs/block_dev.c:1983 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x101/0x150 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x47/0x60 fs/ioctl.c:770 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 10403 Comm: syz-executor.0 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================