================================================================== BUG: KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init write to 0xffff888100b53550 of 8 bytes by task 20045 on cpu 1: blk_mq_rq_ctx_init+0x3dc/0x4e0 block/blk-mq.c:344 __blk_mq_alloc_request+0x270/0x290 block/blk-mq.c:399 blk_mq_submit_bio+0x27f/0xec0 block/blk-mq.c:2199 __submit_bio_noacct_mq block/blk-core.c:998 [inline] submit_bio_noacct+0x6e2/0x7d0 block/blk-core.c:1031 submit_bio+0x10c/0x190 iomap_dio_submit_bio fs/iomap/direct-io.c:74 [inline] iomap_dio_bio_iter+0x990/0xbc0 fs/iomap/direct-io.c:342 __iomap_dio_rw+0x8d8/0x1010 fs/iomap/direct-io.c:569 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:649 ext4_dio_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0x21a/0x290 fs/ext4/file.c:128 call_read_iter include/linux/fs.h:2157 [inline] generic_file_splice_read+0x24f/0x330 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870 do_splice_direct+0x106/0x190 fs/splice.c:979 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1314 [inline] __se_sys_sendfile64 fs/read_write.c:1300 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300 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 0xffff888100b53550 of 8 bytes by task 20043 on cpu 0: blk_mq_rq_ctx_init+0x3ca/0x4e0 block/blk-mq.c:344 __blk_mq_alloc_request+0x270/0x290 block/blk-mq.c:399 blk_mq_submit_bio+0x27f/0xec0 block/blk-mq.c:2199 __submit_bio_noacct_mq block/blk-core.c:998 [inline] submit_bio_noacct+0x6e2/0x7d0 block/blk-core.c:1031 submit_bio+0x10c/0x190 ext4_mpage_readpages+0x10f2/0x1140 fs/ext4/readpage.c:411 ext4_readahead+0x99/0xa0 fs/ext4/inode.c:3202 read_pages+0xb6/0x540 mm/readahead.c:130 page_cache_ra_unbounded+0x3d2/0x430 mm/readahead.c:239 ondemand_readahead+0x58c/0x7c0 page_cache_sync_ra+0xaf/0xe0 mm/readahead.c:580 page_cache_sync_readahead include/linux/pagemap.h:883 [inline] filemap_get_pages mm/filemap.c:2545 [inline] filemap_read+0x3ad/0x1220 mm/filemap.c:2628 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2779 ext4_file_read_iter+0x1db/0x290 call_read_iter include/linux/fs.h:2157 [inline] generic_file_splice_read+0x24f/0x330 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870 do_splice_direct+0x106/0x190 fs/splice.c:979 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1314 [inline] __se_sys_sendfile64 fs/read_write.c:1300 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300 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: 0x000000000000728d -> 0x000000000000728e Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 20043 Comm: syz-executor.4 Not tainted 5.15.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================