loop0: detected capacity change from 0 to 256
==================================================================
BUG: KCSAN: data-race in __lru_add_drain_all / folio_activate

read-write to 0xffff888237d29b88 of 1 bytes by task 47 on cpu 1:
 folio_batch_add include/linux/pagevec.h:74 [inline]
 folio_batch_add_and_move mm/swap.c:231 [inline]
 folio_activate+0xc0/0x1c0 mm/swap.c:361
 folio_mark_accessed+0x119/0x190 mm/swap.c:481
 shmem_file_read_iter+0x338/0x5b0 mm/shmem.c:2806
 do_iter_read+0x4ac/0x7c0 fs/read_write.c:795
 vfs_iter_read+0x56/0x70 fs/read_write.c:837
 lo_read_simple drivers/block/loop.c:290 [inline]
 do_req_filebacked drivers/block/loop.c:500 [inline]
 loop_handle_cmd drivers/block/loop.c:1915 [inline]
 loop_process_work+0x98c/0x12e0 drivers/block/loop.c:1950
 loop_rootcg_workfn+0x22/0x30 drivers/block/loop.c:1981
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2703
 worker_thread+0x525/0x730 kernel/workqueue.c:2784
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

read to 0xffff888237d29b88 of 1 bytes by task 10987 on cpu 0:
 folio_batch_count include/linux/pagevec.h:53 [inline]
 cpu_needs_drain mm/swap.c:800 [inline]
 __lru_add_drain_all+0x21d/0x420 mm/swap.c:889
 lru_add_drain_all+0x10/0x20 mm/swap.c:905
 invalidate_bdev+0x54/0x70 block/bdev.c:86
 bdev_disk_changed+0x11b/0xbd0 block/partitions/core.c:664
 blkdev_get_whole+0x227/0x240 block/bdev.c:653
 blkdev_get_by_dev+0x236/0x390 block/bdev.c:795
 blkdev_open+0xf7/0x1e0 block/fops.c:589
 do_dentry_open+0x5c3/0xae0 fs/open.c:929
 vfs_open+0x4a/0x50 fs/open.c:1063
 do_open fs/namei.c:3640 [inline]
 path_openat+0x17f2/0x1d10 fs/namei.c:3797
 do_filp_open+0xf6/0x200 fs/namei.c:3824
 do_sys_openat2+0xab/0x110 fs/open.c:1422
 do_sys_open fs/open.c:1437 [inline]
 __do_sys_openat fs/open.c:1453 [inline]
 __se_sys_openat fs/open.c:1448 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1448
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10987 Comm: syz-executor.0 Not tainted 6.6.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
==================================================================
loop0: detected capacity change from 0 to 256
loop0: detected capacity change from 0 to 256
loop0: detected capacity change from 0 to 256
loop0: detected capacity change from 0 to 256
loop0: detected capacity change from 0 to 256
loop0: detected capacity change from 0 to 256
loop0: detected capacity change from 0 to 256
loop0: detected capacity change from 0 to 256
loop0: detected capacity change from 0 to 256
loop0: detected capacity change from 0 to 256
loop0: detected capacity change from 0 to 256
loop0: detected capacity change from 0 to 256