================================================================== BUG: KCSAN: data-race in blk_mq_get_request / blk_mq_get_request write to 0xffff888129d52548 of 8 bytes by task 10362 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] __bread_slow fs/buffer.c:1211 [inline] __bread_gfp+0xe1/0x1d0 fs/buffer.c:1393 sb_bread include/linux/buffer_head.h:307 [inline] fat__get_entry+0x379/0x510 fs/fat/dir.c:100 fat_get_entry fs/fat/dir.c:128 [inline] fat_get_short_entry+0xd4/0x1d0 fs/fat/dir.c:877 fat_subdirs+0x6a/0x110 fs/fat/dir.c:943 fat_read_root fs/fat/inode.c:1414 [inline] fat_fill_super+0x132f/0x1c90 fs/fat/inode.c:1858 vfat_fill_super+0x37/0x50 fs/fat/namei_vfat.c:1050 mount_bdev+0x264/0x2d0 fs/super.c:1417 vfat_mount+0x38/0x50 fs/fat/namei_vfat.c:1057 legacy_get_tree+0x78/0xf0 fs/fs_context.c:622 vfs_get_tree+0x52/0x190 fs/super.c:1547 do_new_mount fs/namespace.c:2816 [inline] do_mount+0xff0/0x1590 fs/namespace.c:3141 __do_sys_mount fs/namespace.c:3350 [inline] __se_sys_mount fs/namespace.c:3327 [inline] __x64_sys_mount+0x12b/0x1a0 fs/namespace.c:3327 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888129d52548 of 8 bytes by task 10356 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] block_read_full_page+0x591/0x720 fs/buffer.c:2330 blkdev_readpage+0x23/0x40 fs/block_dev.c:615 generic_file_buffered_read mm/filemap.c:2173 [inline] generic_file_read_iter+0xc52/0x18c0 mm/filemap.c:2309 blkdev_read_iter+0xae/0xe0 fs/block_dev.c:2053 call_read_iter include/linux/fs.h:1901 [inline] new_sync_read+0x306/0x450 fs/read_write.c:415 __vfs_read+0x9e/0xb0 fs/read_write.c:428 vfs_read fs/read_write.c:462 [inline] vfs_read+0x13e/0x2b0 fs/read_write.c:447 ksys_read+0xc5/0x1a0 fs/read_write.c:588 __do_sys_read fs/read_write.c:598 [inline] __se_sys_read fs/read_write.c:596 [inline] __x64_sys_read+0x49/0x60 fs/read_write.c:596 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: 10356 Comm: systemd-udevd Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================