1 NVMe Fault Injection
2 ====================
3 Linux's fault injection framework provides a s
4 error injection via debugfs in the /sys/kernel
5 enabled, the default NVME_SC_INVALID_OPCODE wi
6 injected into the nvme_try_complete_req. Users
7 code and no retry flag via the debugfs. The li
8 Status can be found in include/linux/nvme.h
9
10 Following examples show how to inject an error
11
12 First, enable CONFIG_FAULT_INJECTION_DEBUG_FS
13 recompile the kernel. After booting up the ker
14 following.
15
16 Example 1: Inject default status code with no
17 ----------------------------------------------
18
19 ::
20
21 mount /dev/nvme0n1 /mnt
22 echo 1 > /sys/kernel/debug/nvme0n1/fault_inj
23 echo 100 > /sys/kernel/debug/nvme0n1/fault_i
24 cp a.file /mnt
25
26 Expected Result::
27
28 cp: cannot stat ‘/mnt/a.file’: Input/out
29
30 Message from dmesg::
31
32 FAULT_INJECTION: forcing a failure.
33 name fault_inject, interval 1, probability 1
34 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.
35 Hardware name: innotek GmbH VirtualBox/Virtu
36 BIOS VirtualBox 12/01/2006
37 Call Trace:
38 <IRQ>
39 dump_stack+0x5c/0x7d
40 should_fail+0x148/0x170
41 nvme_should_fail+0x2f/0x50 [nvme_core]
42 nvme_process_cq+0xe7/0x1d0 [nvme]
43 nvme_irq+0x1e/0x40 [nvme]
44 __handle_irq_event_percpu+0x3a/0x190
45 handle_irq_event_percpu+0x30/0x70
46 handle_irq_event+0x36/0x60
47 handle_fasteoi_irq+0x78/0x120
48 handle_irq+0xa7/0x130
49 ? tick_irq_enter+0xa8/0xc0
50 do_IRQ+0x43/0xc0
51 common_interrupt+0xa2/0xa2
52 </IRQ>
53 RIP: 0010:native_safe_halt+0x2/0x10
54 RSP: 0018:ffffffff82003e90 EFLAGS: 00000246
55 RAX: ffffffff817a10c0 RBX: ffffffff82012480
56 RDX: 0000000000000000 RSI: 0000000000000000
57 RBP: 0000000000000000 R08: 000000008e38ce64
58 R10: 0000000000000000 R11: 0000000000000000
59 R13: ffffffff82012480 R14: 0000000000000000
60 ? __sched_text_end+0x4/0x4
61 default_idle+0x18/0xf0
62 do_idle+0x150/0x1d0
63 cpu_startup_entry+0x6f/0x80
64 start_kernel+0x4c4/0x4e4
65 ? set_init_arg+0x55/0x55
66 secondary_startup_64+0xa5/0xb0
67 print_req_error: I/O error, dev nvme0n1, s
68 EXT4-fs error (device nvme0n1): ext4_find_en
69 inode #2: comm cp: reading directory lblock
70
71 Example 2: Inject default status code with ret
72 ----------------------------------------------
73
74 ::
75
76 mount /dev/nvme0n1 /mnt
77 echo 1 > /sys/kernel/debug/nvme0n1/fault_inj
78 echo 100 > /sys/kernel/debug/nvme0n1/fault_i
79 echo 1 > /sys/kernel/debug/nvme0n1/fault_inj
80 echo 0 > /sys/kernel/debug/nvme0n1/fault_inj
81
82 cp a.file /mnt
83
84 Expected Result::
85
86 command success without error
87
88 Message from dmesg::
89
90 FAULT_INJECTION: forcing a failure.
91 name fault_inject, interval 1, probability 1
92 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.
93 Hardware name: innotek GmbH VirtualBox/Virtu
94 Call Trace:
95 <IRQ>
96 dump_stack+0x5c/0x7d
97 should_fail+0x148/0x170
98 nvme_should_fail+0x30/0x60 [nvme_core]
99 nvme_loop_queue_response+0x84/0x110 [nvme_
100 nvmet_req_complete+0x11/0x40 [nvmet]
101 nvmet_bio_done+0x28/0x40 [nvmet]
102 blk_update_request+0xb0/0x310
103 blk_mq_end_request+0x18/0x60
104 flush_smp_call_function_queue+0x3d/0xf0
105 smp_call_function_single_interrupt+0x2c/0x
106 call_function_single_interrupt+0xa2/0xb0
107 </IRQ>
108 RIP: 0010:native_safe_halt+0x2/0x10
109 RSP: 0018:ffffc9000068bec0 EFLAGS: 00000246
110 RAX: ffffffff817a10c0 RBX: ffff88011a3c9680
111 RDX: 0000000000000000 RSI: 0000000000000000
112 RBP: 0000000000000001 R08: 000000008e38c131
113 R10: 0000000000000000 R11: 0000000000000000
114 R13: ffff88011a3c9680 R14: 0000000000000000
115 ? __sched_text_end+0x4/0x4
116 default_idle+0x18/0xf0
117 do_idle+0x150/0x1d0
118 cpu_startup_entry+0x6f/0x80
119 start_secondary+0x187/0x1e0
120 secondary_startup_64+0xa5/0xb0
121
122 Example 3: Inject an error into the 10th admin
123 ----------------------------------------------
124
125 ::
126
127 echo 100 > /sys/kernel/debug/nvme0/fault_inj
128 echo 10 > /sys/kernel/debug/nvme0/fault_inje
129 echo 1 > /sys/kernel/debug/nvme0/fault_injec
130 nvme reset /dev/nvme0
131
132 Expected Result::
133
134 After NVMe controller reset, the reinitializ
135 It depends on which admin command is actuall
136
137 Message from dmesg::
138
139 nvme nvme0: resetting controller
140 FAULT_INJECTION: forcing a failure.
141 name fault_inject, interval 1, probability 1
142 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.
143 Hardware name: MSI MS-7A45/B150M MORTAR ARCT
144 Call Trace:
145 <IRQ>
146 dump_stack+0x63/0x85
147 should_fail+0x14a/0x170
148 nvme_should_fail+0x38/0x80 [nvme_core]
149 nvme_irq+0x129/0x280 [nvme]
150 ? blk_mq_end_request+0xb3/0x120
151 __handle_irq_event_percpu+0x84/0x1a0
152 handle_irq_event_percpu+0x32/0x80
153 handle_irq_event+0x3b/0x60
154 handle_edge_irq+0x7f/0x1a0
155 handle_irq+0x20/0x30
156 do_IRQ+0x4e/0xe0
157 common_interrupt+0xf/0xf
158 </IRQ>
159 RIP: 0010:cpuidle_enter_state+0xc5/0x460
160 Code: ff e8 8f 5f 86 ff 80 7d c7 00 74 17 9c
161 RSP: 0018:ffffffff88c03dd0 EFLAGS: 00000246
162 RAX: ffff9dac25a2ac80 RBX: ffffffff88d53760
163 RDX: 0000000000000000 RSI: 000000002d958403
164 RBP: ffffffff88c03e18 R08: fffffff75e35ffb7
165 R10: ffffffff88c03da0 R11: 0000000000001b0c
166 R13: 0000000000000006 R14: 0000000000000006
167 cpuidle_enter+0x2e/0x40
168 call_cpuidle+0x23/0x40
169 do_idle+0x201/0x280
170 cpu_startup_entry+0x1d/0x20
171 rest_init+0xaa/0xb0
172 arch_call_rest_init+0xe/0x1b
173 start_kernel+0x51c/0x53b
174 x86_64_start_reservations+0x24/0x26
175 x86_64_start_kernel+0x74/0x77
176 secondary_startup_64+0xa4/0xb0
177 nvme nvme0: Could not set queue count (16385
178 nvme nvme0: IO queues not created
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