TITLE: KMSAN: uninit-value in virtqueue_add
ALT: bad-access in virtqueue_add
TYPE: KMSAN-UNINIT-VALUE

[  897.203644][ T1083] =====================================================
[  897.210960][ T1083] BUG: KMSAN: uninit-value in virtqueue_add+0x20e2/0x60f0
[  897.218269][ T1083]  virtqueue_add+0x20e2/0x60f0
[  897.223210][ T1083]  virtqueue_add_sgs+0x186/0x1a0
[  897.228331][ T1083]  virtscsi_add_cmd+0x838/0xad0
[  897.233399][ T1083]  virtscsi_queuecommand+0x895/0xa60
[  897.238953][ T1083]  scsi_queue_rq+0x4931/0x5680
[  897.243961][ T1083]  blk_mq_dispatch_rq_list+0x1184/0x39c0
[  897.249850][ T1083]  __blk_mq_sched_dispatch_requests+0x1234/0x2670
[  897.254274][T12093] 8021q: adding VLAN 0 to HW filter on device bond3
[  897.256473][ T1083]  blk_mq_sched_dispatch_requests+0x15d/0x2c0
[  897.269363][ T1083]  blk_mq_run_work_fn+0xd0/0x280
[  897.274520][ T1083]  process_one_work+0xb0d/0x1410
[  897.279631][ T1083]  worker_thread+0x107e/0x1d60
[  897.284574][ T1083]  kthread+0x3e8/0x540
[  897.288838][ T1083]  ret_from_fork+0x1f/0x30
[  897.293448][ T1083] 
[  897.295857][ T1083] Uninit was created at:
[  897.300327][ T1083]  __alloc_pages+0x9a4/0xe00
[  897.305101][ T1083]  alloc_pages+0xd01/0x1040
[  897.309775][ T1083]  folio_alloc+0x42/0x120
[  897.314272][ T1083]  filemap_alloc_folio+0xa5/0x430
[  897.319447][ T1083]  __filemap_get_folio+0x908/0x13a0
[  897.324796][ T1083]  ext4_da_write_begin+0x7f8/0xec0
[  897.330056][ T1083]  generic_perform_write+0x3df/0xbb0
[  897.335517][ T1083]  ext4_buffered_write_iter+0x5ec/0xbe0
[  897.341253][ T1083]  ext4_file_write_iter+0x2365/0x3400
[  897.346786][ T1083]  __kernel_write_iter+0x323/0x930
[  897.352106][ T1083]  dump_user_range+0x593/0xce0
[  897.357049][ T1083]  elf_core_dump+0x59e8/0x5c60
[  897.362000][ T1083]  do_coredump+0x32c8/0x4910
[  897.367050][ T1083]  get_signal+0x2185/0x2bc0
[  897.371757][ T1083]  arch_do_signal_or_restart+0x4f/0x920
[  897.377514][ T1083]  exit_to_user_mode_loop+0xe8/0x320
[  897.382999][ T1083]  exit_to_user_mode_prepare+0x163/0x220
[  897.388832][ T1083]  irqentry_exit_to_user_mode+0xd/0x20
[  897.394445][ T1083]  irqentry_exit+0x16/0x40
[  897.398989][ T1083]  exc_page_fault+0x5a5/0x740
[  897.403853][ T1083]  asm_exc_page_fault+0x2b/0x30
[  897.408875][ T1083] 
[  897.411287][ T1083] Bytes 0-4095 of 4096 are uninitialized
[  897.417019][ T1083] Memory access of size 4096 starts at ffff88813ebe8000
[  897.424064][ T1083] 
[  897.426466][ T1083] CPU: 1 PID: 1083 Comm: kworker/1:1H Not tainted 6.4.0-syzkaller-g257152fe29be #0
[  897.435948][ T1083] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
[  897.446155][ T1083] Workqueue: kblockd blk_mq_run_work_fn
[  897.451911][ T1083] =====================================================
