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BUG: KCSAN: data-race in blk_mq_get_request / blk_mq_get_request

write to 0xffff88812922d148 of 8 bytes by task 11661 on cpu 1:
 blk_mq_get_request+0x91a/0xba0 block/blk-mq.c:396
 blk_mq_make_request+0x2d7/0xf60 block/blk-mq.c:2001
 generic_make_request block/blk-core.c:1075 [inline]
 generic_make_request+0x196/0x700 block/blk-core.c:1017
 submit_bio+0x8f/0x3a0 block/blk-core.c:1200
 submit_bh_wbc+0x40d/0x460 fs/buffer.c:3063
 submit_bh fs/buffer.c:3069 [inline]
 bh_submit_read+0x7f/0x130 fs/buffer.c:3410
 mext_page_mkuptodate+0x48b/0x740 fs/ext4/move_extent.c:218
 move_extent_per_page fs/ext4/move_extent.c:348 [inline]
 ext4_move_extents+0x11e4/0x1c90 fs/ext4/move_extent.c:673
 ext4_ioctl+0x2bea/0x3340 fs/ext4/ioctl.c:980
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x101/0x150 fs/ioctl.c:763
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x47/0x60 fs/ioctl.c:770
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812922d148 of 8 bytes by task 11651 on cpu 0:
 blk_mq_get_request+0x907/0xba0 block/blk-mq.c:396
 blk_mq_make_request+0x2d7/0xf60 block/blk-mq.c:2001
 generic_make_request block/blk-core.c:1075 [inline]
 generic_make_request+0x196/0x700 block/blk-core.c:1017
 submit_bio+0x8f/0x3a0 block/blk-core.c:1200
 submit_bh_wbc+0x40d/0x460 fs/buffer.c:3063
 submit_bh fs/buffer.c:3069 [inline]
 bh_submit_read+0x7f/0x130 fs/buffer.c:3410
 mext_page_mkuptodate+0x48b/0x740 fs/ext4/move_extent.c:218
 move_extent_per_page fs/ext4/move_extent.c:348 [inline]
 ext4_move_extents+0x11e4/0x1c90 fs/ext4/move_extent.c:673
 ext4_ioctl+0x2bea/0x3340 fs/ext4/ioctl.c:980
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x101/0x150 fs/ioctl.c:763
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x47/0x60 fs/ioctl.c:770
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11651 Comm: syz-executor.0 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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