================================================================== BUG: KCSAN: data-race in blk_mq_get_request / blk_mq_get_request read to 0xffff88812b08c148 of 8 bytes by task 18853 on cpu 1: blk_mq_get_request+0x85a/0xac0 block/blk-mq.c:396 blk_mq_make_request+0x2d9/0xf60 block/blk-mq.c:1935 generic_make_request block/blk-core.c:1066 [inline] generic_make_request+0x196/0x700 block/blk-core.c:1008 submit_bio+0x96/0x3c0 block/blk-core.c:1192 submit_bh_wbc+0x40f/0x460 fs/buffer.c:3135 submit_bh fs/buffer.c:3141 [inline] __sync_dirty_buffer+0xd3/0x210 fs/buffer.c:3227 sync_dirty_buffer+0x24/0x40 fs/buffer.c:3240 __ext4_handle_dirty_metadata+0x19c/0x3e0 fs/ext4/ext4_jbd2.c:316 __ext4_ext_dirty+0xbe/0x120 fs/ext4/extents.c:173 ext4_ext_insert_extent+0x9cd/0x25c0 fs/ext4/extents.c:2167 ext4_ext_map_blocks+0xc52/0x2320 fs/ext4/extents.c:4507 ext4_map_blocks+0x23a/0xff0 fs/ext4/inode.c:623 ext4_iomap_alloc fs/ext4/inode.c:3400 [inline] ext4_iomap_begin+0x27d/0x490 fs/ext4/inode.c:3439 iomap_apply+0xdc/0x6a0 fs/iomap/apply.c:46 iomap_dio_rw+0x67e/0x9a0 fs/iomap/direct-io.c:498 ext4_dio_write_iter fs/ext4/file.c:438 [inline] ext4_file_write_iter+0xc38/0xd40 fs/ext4/file.c:545 call_write_iter include/linux/fs.h:1902 [inline] do_iter_readv_writev+0x487/0x5b0 fs/read_write.c:693 do_iter_write fs/read_write.c:970 [inline] do_iter_write+0x13b/0x3c0 fs/read_write.c:951 vfs_iter_write+0x5c/0x80 fs/read_write.c:983 iter_file_splice_write+0x530/0x840 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0xa0/0xc0 fs/splice.c:1037 splice_direct_to_actor+0x22b/0x540 fs/splice.c:992 do_splice_direct+0x161/0x1e0 fs/splice.c:1080 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x12a/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff88812b08c148 of 8 bytes by task 18848 on cpu 0: blk_mq_get_request+0x86d/0xac0 block/blk-mq.c:396 blk_mq_make_request+0x2d9/0xf60 block/blk-mq.c:1935 generic_make_request block/blk-core.c:1066 [inline] generic_make_request+0x196/0x700 block/blk-core.c:1008 submit_bio+0x96/0x3c0 block/blk-core.c:1192 submit_bh_wbc+0x40f/0x460 fs/buffer.c:3135 submit_bh fs/buffer.c:3141 [inline] __sync_dirty_buffer+0xd3/0x210 fs/buffer.c:3227 sync_dirty_buffer+0x24/0x40 fs/buffer.c:3240 __ext4_handle_dirty_metadata+0x19c/0x3e0 fs/ext4/ext4_jbd2.c:316 __ext4_ext_dirty+0xbe/0x120 fs/ext4/extents.c:173 ext4_ext_insert_extent+0x9cd/0x25c0 fs/ext4/extents.c:2167 ext4_ext_map_blocks+0xc52/0x2320 fs/ext4/extents.c:4507 ext4_map_blocks+0x23a/0xff0 fs/ext4/inode.c:623 ext4_iomap_alloc fs/ext4/inode.c:3400 [inline] ext4_iomap_begin+0x27d/0x490 fs/ext4/inode.c:3439 iomap_apply+0xdc/0x6a0 fs/iomap/apply.c:46 iomap_dio_rw+0x67e/0x9a0 fs/iomap/direct-io.c:498 ext4_dio_write_iter fs/ext4/file.c:438 [inline] ext4_file_write_iter+0xc38/0xd40 fs/ext4/file.c:545 call_write_iter include/linux/fs.h:1902 [inline] do_iter_readv_writev+0x487/0x5b0 fs/read_write.c:693 do_iter_write fs/read_write.c:970 [inline] do_iter_write+0x13b/0x3c0 fs/read_write.c:951 vfs_iter_write+0x5c/0x80 fs/read_write.c:983 iter_file_splice_write+0x530/0x840 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0xa0/0xc0 fs/splice.c:1037 splice_direct_to_actor+0x22b/0x540 fs/splice.c:992 do_splice_direct+0x161/0x1e0 fs/splice.c:1080 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x12a/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 18848 Comm: syz-executor.2 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================