================================================================== BUG: KCSAN: data-race in blk_mq_get_request / blk_mq_get_request write to 0xffff88812ab38548 of 8 bytes by task 15564 on cpu 0: 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 ext4_mpage_readpages+0xf1a/0x14d0 fs/ext4/readpage.c:414 ext4_readpages+0x8e/0xb0 fs/ext4/inode.c:3243 read_pages+0xa2/0x360 mm/readahead.c:126 __do_page_cache_readahead+0x358/0x380 mm/readahead.c:212 ra_submit mm/internal.h:62 [inline] ondemand_readahead+0x369/0x730 mm/readahead.c:492 page_cache_sync_readahead+0x1b0/0x1e0 mm/readahead.c:527 generic_file_buffered_read mm/filemap.c:2036 [inline] generic_file_read_iter+0xf24/0x18c0 mm/filemap.c:2309 ext4_file_read_iter fs/ext4/file.c:131 [inline] ext4_file_read_iter+0x103/0x360 fs/ext4/file.c:114 call_read_iter include/linux/fs.h:1901 [inline] generic_file_splice_read+0x2df/0x470 fs/splice.c:313 do_splice_to+0xc7/0x100 fs/splice.c:892 splice_direct_to_actor+0x1b9/0x540 fs/splice.c:971 do_splice_direct+0x152/0x1d0 fs/splice.c:1080 do_sendfile+0x380/0x800 fs/read_write.c:1521 __do_sys_sendfile64 fs/read_write.c:1582 [inline] __se_sys_sendfile64 fs/read_write.c:1568 [inline] __x64_sys_sendfile64+0x121/0x140 fs/read_write.c:1568 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88812ab38548 of 8 bytes by task 15578 on cpu 1: 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 ext4_io_submit+0xdf/0x110 fs/ext4/page-io.c:382 ext4_writepages+0x5bb/0x1e10 fs/ext4/inode.c:2727 do_writepages+0x6b/0x170 mm/page-writeback.c:2344 __filemap_fdatawrite_range+0x1bb/0x220 mm/filemap.c:421 file_write_and_wait_range+0xfb/0x160 mm/filemap.c:760 ext4_sync_file+0x26e/0x8b0 fs/ext4/fsync.c:153 vfs_fsync_range+0x7c/0x150 fs/sync.c:197 generic_write_sync include/linux/fs.h:2872 [inline] ext4_buffered_write_iter+0x211/0x280 fs/ext4/file.c:277 ext4_file_write_iter+0xf4/0xd30 fs/ext4/file.c:642 call_write_iter include/linux/fs.h:1907 [inline] do_iter_readv_writev+0x4a7/0x5d0 fs/read_write.c:694 do_iter_write fs/read_write.c:999 [inline] do_iter_write+0x137/0x3a0 fs/read_write.c:980 vfs_iter_write+0x56/0x80 fs/read_write.c:1040 iter_file_splice_write+0x530/0x830 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0x97/0xb0 fs/splice.c:1037 splice_direct_to_actor+0x22f/0x540 fs/splice.c:992 do_splice_direct+0x152/0x1d0 fs/splice.c:1080 do_sendfile+0x380/0x800 fs/read_write.c:1521 __do_sys_sendfile64 fs/read_write.c:1576 [inline] __se_sys_sendfile64 fs/read_write.c:1568 [inline] __x64_sys_sendfile64+0xb8/0x140 fs/read_write.c:1568 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: 1 PID: 15578 Comm: syz-executor.2 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================