Documentation/fault-injection/nvme-fault-injection.rst

Source file repositories/reference/linux-study-clean/Documentation/fault-injection/nvme-fault-injection.rst

File Facts

System
Linux kernel
Corpus path
Documentation/fault-injection/nvme-fault-injection.rst
Extension
.rst
Size
6535 bytes
Lines
179
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: documentation
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

start_kernel+0x4c4/0x4e4
    ? set_init_arg+0x55/0x55
    secondary_startup_64+0xa5/0xb0
    print_req_error: I/O error, dev nvme0n1, sector 9240
  EXT4-fs error (device nvme0n1): ext4_find_entry:1436:
  inode #2: comm cp: reading directory lblock 0

Example 2: Inject default status code with retry
------------------------------------------------

::

  mount /dev/nvme0n1 /mnt
  echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/times
  echo 100 > /sys/kernel/debug/nvme0n1/fault_inject/probability
  echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/status
  echo 0 > /sys/kernel/debug/nvme0n1/fault_inject/dont_retry

  cp a.file /mnt

Expected Result::

  command success without error

Message from dmesg::

  FAULT_INJECTION: forcing a failure.
  name fault_inject, interval 1, probability 100, space 0, times 1
  CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-rc8+ #4
  Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
  Call Trace:
    <IRQ>
    dump_stack+0x5c/0x7d
    should_fail+0x148/0x170
    nvme_should_fail+0x30/0x60 [nvme_core]
    nvme_loop_queue_response+0x84/0x110 [nvme_loop]
    nvmet_req_complete+0x11/0x40 [nvmet]
    nvmet_bio_done+0x28/0x40 [nvmet]
    blk_update_request+0xb0/0x310
    blk_mq_end_request+0x18/0x60
    flush_smp_call_function_queue+0x3d/0xf0
    smp_call_function_single_interrupt+0x2c/0xc0
    call_function_single_interrupt+0xa2/0xb0
    </IRQ>
  RIP: 0010:native_safe_halt+0x2/0x10
  RSP: 0018:ffffc9000068bec0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff04
  RAX: ffffffff817a10c0 RBX: ffff88011a3c9680 RCX: 0000000000000000
  RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
  RBP: 0000000000000001 R08: 000000008e38c131 R09: 0000000000000000
  R10: 0000000000000000 R11: 0000000000000000 R12: ffff88011a3c9680
  R13: ffff88011a3c9680 R14: 0000000000000000 R15: 0000000000000000
    ? __sched_text_end+0x4/0x4
    default_idle+0x18/0xf0
    do_idle+0x150/0x1d0
    cpu_startup_entry+0x6f/0x80
    start_secondary+0x187/0x1e0
    secondary_startup_64+0xa5/0xb0

Example 3: Inject an error into the 10th admin command
------------------------------------------------------

::

  echo 100 > /sys/kernel/debug/nvme0/fault_inject/probability
  echo 10 > /sys/kernel/debug/nvme0/fault_inject/space
  echo 1 > /sys/kernel/debug/nvme0/fault_inject/times
  nvme reset /dev/nvme0

Expected Result::

Annotation

Implementation Notes