================================================================== BUG: KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init write to 0xffff888102691150 of 8 bytes by task 16136 on cpu 0: 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 0xffff888102691150 of 8 bytes by task 16140 on cpu 1: 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_io_submit+0xcd/0xf0 fs/ext4/page-io.c:379 ext4_writepages+0xb2a/0x1d70 fs/ext4/inode.c:2818 do_writepages+0x26b/0x3c0 mm/page-writeback.c:2364 filemap_fdatawrite_wbc mm/filemap.c:400 [inline] __filemap_fdatawrite_range mm/filemap.c:433 [inline] filemap_write_and_wait_range+0x238/0x3c0 mm/filemap.c:704 __iomap_dio_rw+0x4ca/0x1010 fs/iomap/direct-io.c:540 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 value changed: 0x0000000000004f49 -> 0x0000000000004f4a Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 16140 Comm: syz-executor.5 Tainted: G W 5.15.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================