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BUG: KCSAN: data-race in mb_free_blocks / mb_update_avg_fragment_size

write to 0xffff8881010e8b58 of 4 bytes by task 11519 on cpu 0:
 mb_free_blocks+0x323/0xb40
 ext4_trim_extent+0x2de/0x430 fs/ext4/mballoc.c:6290
 ext4_try_to_trim_range+0x1a4/0x4c0 fs/ext4/mballoc.c:6317
 ext4_trim_all_free+0x272/0x490 fs/ext4/mballoc.c:6378
 ext4_trim_fs+0x433/0x560 fs/ext4/mballoc.c:6461
 __ext4_ioctl fs/ext4/ioctl.c:1122 [inline]
 ext4_ioctl+0x1007/0x2190 fs/ext4/ioctl.c:1279
 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

read to 0xffff8881010e8b58 of 4 bytes by task 11492 on cpu 1:
 ext4_mb_avg_fragment_size_cmp fs/ext4/mballoc.c:838 [inline]
 ext4_mb_rb_insert fs/ext4/mballoc.c:815 [inline]
 mb_update_avg_fragment_size+0x161/0x260 fs/ext4/mballoc.c:863
 mb_mark_used+0xae0/0xc50 fs/ext4/mballoc.c:1998
 ext4_trim_extent+0xd5/0x430 fs/ext4/mballoc.c:6286
 ext4_try_to_trim_range+0x1a4/0x4c0 fs/ext4/mballoc.c:6317
 ext4_trim_all_free+0x272/0x490 fs/ext4/mballoc.c:6378
 ext4_trim_fs+0x433/0x560 fs/ext4/mballoc.c:6461
 __ext4_ioctl fs/ext4/ioctl.c:1122 [inline]
 ext4_ioctl+0x1007/0x2190 fs/ext4/ioctl.c:1279
 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: 0x00000089 -> 0x0000008a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11492 Comm: syz-executor.3 Not tainted 5.15.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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