syzbot

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BUG: KCSAN: data-race in has_bh_in_lru / invalidate_bh_lrus_cpu

write to 0xffff888237d2bb10 of 8 bytes by task 979 on cpu 1:
 __invalidate_bh_lrus fs/buffer.c:1505 [inline]
 invalidate_bh_lrus_cpu+0x85/0xc0 fs/buffer.c:1550
 lru_add_and_bh_lrus_drain mm/swap.c:759 [inline]
 lru_add_drain_per_cpu+0x62/0x80 mm/swap.c:778
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3310
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3391
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffff888237d2bb10 of 8 bytes by task 10271 on cpu 0:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1527
 smp_call_function_many_cond+0x2d5/0xc20 kernel/smp.c:837
 on_each_cpu_cond_mask+0x3c/0x90 kernel/smp.c:1051
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1536
 invalidate_bdev+0x42/0x70 block/bdev.c:100
 loop_set_block_size drivers/block/loop.c:1471 [inline]
 lo_simple_ioctl drivers/block/loop.c:1497 [inline]
 lo_ioctl+0xb38/0x11c0 drivers/block/loop.c:1560
 blkdev_ioctl+0x359/0x450 block/ioctl.c:693
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xcd/0x140 fs/ioctl.c:893
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:893
 x64_sys_call+0x15cc/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff88811f0a5c30

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 10271 Comm: syz.1.1784 Not tainted 6.12.0-rc3-syzkaller-00044-g2f87d0916ce0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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Invalid logical block size (65472)