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- NVMe Fault Injection
- ====================
- Linux's fault injection framework provides a systematic way to support
- error injection via debugfs in the /sys/kernel/debug directory. When
- enabled, the default NVME_SC_INVALID_OPCODE with no retry will be
- injected into the nvme_end_request. Users can change the default status
- code and no retry flag via the debugfs. The list of Generic Command
- Status can be found in include/linux/nvme.h
- Following examples show how to inject an error into the nvme.
- First, enable CONFIG_FAULT_INJECTION_DEBUG_FS kernel config,
- recompile the kernel. After booting up the kernel, do the
- following.
- Example 1: Inject default status code with no retry
- ---------------------------------------------------
- mount /dev/nvme0n1 /mnt
- echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/times
- echo 100 > /sys/kernel/debug/nvme0n1/fault_inject/probability
- cp a.file /mnt
- Expected Result:
- cp: cannot stat ‘/mnt/a.file’: Input/output error
- Message from dmesg:
- FAULT_INJECTION: forcing a failure.
- name fault_inject, interval 1, probability 100, space 0, times 1
- CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.15.0-rc8+ #2
- 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+0x2f/0x50 [nvme_core]
- nvme_process_cq+0xe7/0x1d0 [nvme]
- nvme_irq+0x1e/0x40 [nvme]
- __handle_irq_event_percpu+0x3a/0x190
- handle_irq_event_percpu+0x30/0x70
- handle_irq_event+0x36/0x60
- handle_fasteoi_irq+0x78/0x120
- handle_irq+0xa7/0x130
- ? tick_irq_enter+0xa8/0xc0
- do_IRQ+0x43/0xc0
- common_interrupt+0xa2/0xa2
- </IRQ>
- RIP: 0010:native_safe_halt+0x2/0x10
- RSP: 0018:ffffffff82003e90 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffdd
- RAX: ffffffff817a10c0 RBX: ffffffff82012480 RCX: 0000000000000000
- RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
- RBP: 0000000000000000 R08: 000000008e38ce64 R09: 0000000000000000
- R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82012480
- R13: ffffffff82012480 R14: 0000000000000000 R15: 0000000000000000
- ? __sched_text_end+0x4/0x4
- default_idle+0x18/0xf0
- do_idle+0x150/0x1d0
- cpu_startup_entry+0x6f/0x80
- 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
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