BFS-fs: bfs_fill_super(): loop1 is unclean, continuing
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BUG: KCSAN: data-race in calc_wb_limits.part.0 / wbt_track

write to 0xffff88821aa64d04 of 4 bytes by interrupt on cpu 1:
 calc_wb_limits.part.0+0x7b/0xb0 block/blk-wbt.c:304
 calc_wb_limits block/blk-wbt.c:298 [inline]
 scale_up block/blk-wbt.c:313 [inline]
 scale_up+0x7f/0x250 block/blk-wbt.c:309
 wb_timer_fn+0x2cd/0xad0 block/blk-wbt.c:393
 blk_stat_timer_fn+0x3b0/0x3d0 block/blk-stat.c:98
 call_timer_fn+0x5f/0x2f0 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0xcb8/0xd20 kernel/time/timer.c:1786
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0xbb/0xe0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0xe6/0x280 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 __read_once_size include/linux/compiler.h:227 [inline]
 check_kcov_mode kernel/kcov.c:70 [inline]
 write_comp_data+0x1e/0x70 kernel/kcov.c:123
 PageCompound include/linux/page-flags.h:188 [inline]
 page_mapcount include/linux/mm.h:726 [inline]
 zap_pte_range mm/memory.c:1063 [inline]
 zap_pmd_range mm/memory.c:1166 [inline]
 zap_pud_range mm/memory.c:1195 [inline]
 zap_p4d_range mm/memory.c:1216 [inline]
 unmap_page_range+0x1289/0x18d0 mm/memory.c:1237
 unmap_single_vma+0x144/0x200 mm/memory.c:1282
 unmap_vmas+0xda/0x1a0 mm/memory.c:1314

read to 0xffff88821aa64d04 of 4 bytes by task 7561 on cpu 0:
 rwb_enabled block/blk-wbt.c:80 [inline]
 bio_to_wbt_flags block/blk-wbt.c:551 [inline]
 wbt_track+0x39/0xa0 block/blk-wbt.c:600
 __rq_qos_track+0x52/0x80 block/blk-rq-qos.c:81
 rq_qos_track block/blk-rq-qos.h:192 [inline]
 blk_mq_make_request+0x32e/0xf60 block/blk-mq.c:1984
 generic_make_request block/blk-core.c:1064 [inline]
 generic_make_request+0x196/0x740 block/blk-core.c:1006
 submit_bio+0x96/0x3c0 block/blk-core.c:1190
 submit_bh_wbc+0x40f/0x460 fs/buffer.c:3095
 submit_bh fs/buffer.c:3101 [inline]
 __bread_slow fs/buffer.c:1177 [inline]
 __bread_gfp+0xe7/0x1e0 fs/buffer.c:1359
 sb_bread include/linux/buffer_head.h:307 [inline]
 bfs_fill_super+0x477/0x800 fs/bfs/inode.c:380
 mount_bdev+0x262/0x2d0 fs/super.c:1415
 bfs_mount+0x3e/0x60 fs/bfs/inode.c:456
 legacy_get_tree+0x7e/0xf0 fs/fs_context.c:647
 vfs_get_tree+0x56/0x1a0 fs/super.c:1545
 do_new_mount fs/namespace.c:2823 [inline]
 do_mount+0x1071/0x15a0 fs/namespace.c:3143

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7561 Comm: syz-executor.1 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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