================================================================== BUG: KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init write to 0xffff88810266a950 of 8 bytes by task 9143 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_write_iter fs/ext4/file.c:568 [inline] ext4_file_write_iter+0xaa9/0x11f0 fs/ext4/file.c:678 call_write_iter include/linux/fs.h:2163 [inline] do_iter_readv_writev+0x2de/0x380 fs/read_write.c:729 do_iter_write+0x192/0x5c0 fs/read_write.c:855 vfs_iter_write+0x4c/0x70 fs/read_write.c:896 iter_file_splice_write+0x43a/0x790 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x650 fs/splice.c:891 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 0xffff88810266a950 of 8 bytes by task 9129 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 submit_bh_wbc+0x2f3/0x330 fs/buffer.c:3054 submit_bh fs/buffer.c:3060 [inline] __sync_dirty_buffer+0x136/0x1e0 fs/buffer.c:3155 sync_dirty_buffer+0x16/0x20 fs/buffer.c:3168 __ext4_handle_dirty_metadata+0x1c9/0x5a0 fs/ext4/ext4_jbd2.c:380 ext4_splice_branch fs/ext4/indirect.c:465 [inline] ext4_ind_map_blocks+0x12b6/0x16d0 fs/ext4/indirect.c:639 ext4_map_blocks+0x6e3/0xf00 fs/ext4/inode.c:639 ext4_iomap_alloc fs/ext4/inode.c:3368 [inline] ext4_iomap_begin+0x4b0/0x630 fs/ext4/inode.c:3418 iomap_iter+0x39c/0x470 fs/iomap/iter.c:74 __iomap_dio_rw+0xbe3/0x1010 fs/iomap/direct-io.c:568 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:649 ext4_dio_write_iter fs/ext4/file.c:568 [inline] ext4_file_write_iter+0xaa9/0x11f0 fs/ext4/file.c:678 call_write_iter include/linux/fs.h:2163 [inline] do_iter_readv_writev+0x2de/0x380 fs/read_write.c:729 do_iter_write+0x192/0x5c0 fs/read_write.c:855 vfs_iter_write+0x4c/0x70 fs/read_write.c:896 iter_file_splice_write+0x43a/0x790 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x650 fs/splice.c:891 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: 0x0000000000006745 -> 0x0000000000006746 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 9129 Comm: syz-executor.3 Not tainted 5.15.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== syz-executor.3 (9129) used greatest stack depth: 9472 bytes left