loop2: detected capacity change from 0 to 240
==================================================================
BUG: KCSAN: data-race in has_bh_in_lru / invalidate_bh_lrus_cpu

write to 0xffff888237c42f10 of 8 bytes by task 5646 on cpu 0:
 __invalidate_bh_lrus fs/buffer.c:1393 [inline]
 invalidate_bh_lrus_cpu+0xad/0xe0 fs/buffer.c:1434
 lru_add_drain_cpu+0x243/0x270 mm/swap.c:645
 lru_add_drain+0x28/0x40 mm/swap.c:724
 exit_mmap+0x208/0x460 mm/mmap.c:3196
 __mmput+0x27/0x1c0 kernel/fork.c:1101
 mmput+0x3d/0x50 kernel/fork.c:1122
 free_bprm+0xce/0x1f0 fs/exec.c:1479
 kernel_execve+0x4e9/0x640 fs/exec.c:1976
 call_usermodehelper_exec_async+0x1d8/0x290 kernel/umh.c:112
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

read to 0xffff888237c42f10 of 8 bytes by task 5631 on cpu 1:
 has_bh_in_lru+0x31/0x1c0 fs/buffer.c:1415
 smp_call_function_many_cond+0x226/0x620 kernel/smp.c:915
 on_each_cpu_cond_mask+0x31/0x40 kernel/smp.c:1133
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x26/0x30 fs/buffer.c:1424
 kill_bdev fs/block_dev.c:85 [inline]
 set_blocksize+0x242/0x270 fs/block_dev.c:166
 sb_set_blocksize+0x2c/0xa0 fs/block_dev.c:175
 isofs_fill_super+0x10d7/0x1940 fs/isofs/inode.c:861
 mount_bdev+0x1e8/0x290 fs/super.c:1368
 isofs_mount+0x2d/0x40 fs/isofs/inode.c:1566
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:610
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498
 do_new_mount fs/namespace.c:2919 [inline]
 path_mount+0x11d4/0x1ce0 fs/namespace.c:3249
 do_mount fs/namespace.c:3262 [inline]
 __do_sys_mount fs/namespace.c:3470 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3447
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3447
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff888102ea2478 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5631 Comm: syz-executor.2 Not tainted 5.14.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================