================================================================== BUG: KCSAN: data-race in has_bh_in_lru / invalidate_bh_lrus_cpu write to 0xffff888237d22f18 of 8 bytes by task 1571 on cpu 1: __invalidate_bh_lrus fs/buffer.c:1393 [inline] invalidate_bh_lrus_cpu+0xad/0xe0 fs/buffer.c:1434 lru_add_drain_cpu+0x256/0x280 mm/swap.c:623 lru_add_drain mm/swap.c:702 [inline] lru_add_drain_per_cpu+0x28/0x40 mm/swap.c:720 process_one_work+0x402/0x910 kernel/workqueue.c:2297 worker_thread+0x636/0xae0 kernel/workqueue.c:2444 kthread+0x262/0x280 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 read to 0xffff888237d22f18 of 8 bytes by task 9068 on cpu 0: has_bh_in_lru+0x31/0x1c0 fs/buffer.c:1415 smp_call_function_many_cond+0x236/0x620 kernel/smp.c:917 on_each_cpu_cond_mask+0x31/0x40 kernel/smp.c:1135 on_each_cpu_cond include/linux/smp.h:105 [inline] invalidate_bh_lrus+0x26/0x30 fs/buffer.c:1424 invalidate_bdev+0x51/0x80 block/bdev.c:86 __loop_clr_fd+0x521/0x850 drivers/block/loop.c:1399 loop_clr_fd drivers/block/loop.c:1494 [inline] lo_ioctl+0xac5/0x13e0 drivers/block/loop.c:1850 blkdev_ioctl+0x1d0/0x3f0 block/ioctl.c:589 block_ioctl+0x6e/0x80 block/fops.c:477 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:860 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0xffff88810043ad00 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 9068 Comm: syz-executor.1 Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== loop1: detected capacity change from 0 to 1051 EXT4-fs (loop1): bad geometry: first data block 301989888 is beyond end of filesystem (512)