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cf4182f3 TT |
1 | NVMe Fault Injection |
2 | ==================== | |
3 | Linux's fault injection framework provides a systematic way to support | |
4 | error injection via debugfs in the /sys/kernel/debug directory. When | |
5 | enabled, the default NVME_SC_INVALID_OPCODE with no retry will be | |
6 | injected into the nvme_end_request. Users can change the default status | |
7 | code and no retry flag via the debugfs. The list of Generic Command | |
8 | Status can be found in include/linux/nvme.h | |
9 | ||
10 | Following examples show how to inject an error into the nvme. | |
11 | ||
12 | First, enable CONFIG_FAULT_INJECTION_DEBUG_FS kernel config, | |
13 | recompile the kernel. After booting up the kernel, do the | |
14 | following. | |
15 | ||
16 | Example 1: Inject default status code with no retry | |
17 | --------------------------------------------------- | |
18 | ||
19 | mount /dev/nvme0n1 /mnt | |
20 | echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/times | |
21 | echo 100 > /sys/kernel/debug/nvme0n1/fault_inject/probability | |
22 | cp a.file /mnt | |
23 | ||
24 | Expected Result: | |
25 | ||
26 | cp: cannot stat ‘/mnt/a.file’: Input/output error | |
27 | ||
28 | Message from dmesg: | |
29 | ||
30 | FAULT_INJECTION: forcing a failure. | |
31 | name fault_inject, interval 1, probability 100, space 0, times 1 | |
32 | CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.15.0-rc8+ #2 | |
33 | Hardware name: innotek GmbH VirtualBox/VirtualBox, | |
34 | BIOS VirtualBox 12/01/2006 | |
35 | Call Trace: | |
36 | <IRQ> | |
37 | dump_stack+0x5c/0x7d | |
38 | should_fail+0x148/0x170 | |
39 | nvme_should_fail+0x2f/0x50 [nvme_core] | |
40 | nvme_process_cq+0xe7/0x1d0 [nvme] | |
41 | nvme_irq+0x1e/0x40 [nvme] | |
42 | __handle_irq_event_percpu+0x3a/0x190 | |
43 | handle_irq_event_percpu+0x30/0x70 | |
44 | handle_irq_event+0x36/0x60 | |
45 | handle_fasteoi_irq+0x78/0x120 | |
46 | handle_irq+0xa7/0x130 | |
47 | ? tick_irq_enter+0xa8/0xc0 | |
48 | do_IRQ+0x43/0xc0 | |
49 | common_interrupt+0xa2/0xa2 | |
50 | </IRQ> | |
51 | RIP: 0010:native_safe_halt+0x2/0x10 | |
52 | RSP: 0018:ffffffff82003e90 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffdd | |
53 | RAX: ffffffff817a10c0 RBX: ffffffff82012480 RCX: 0000000000000000 | |
54 | RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 | |
55 | RBP: 0000000000000000 R08: 000000008e38ce64 R09: 0000000000000000 | |
56 | R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82012480 | |
57 | R13: ffffffff82012480 R14: 0000000000000000 R15: 0000000000000000 | |
58 | ? __sched_text_end+0x4/0x4 | |
59 | default_idle+0x18/0xf0 | |
60 | do_idle+0x150/0x1d0 | |
61 | cpu_startup_entry+0x6f/0x80 | |
62 | start_kernel+0x4c4/0x4e4 | |
63 | ? set_init_arg+0x55/0x55 | |
64 | secondary_startup_64+0xa5/0xb0 | |
65 | print_req_error: I/O error, dev nvme0n1, sector 9240 | |
66 | EXT4-fs error (device nvme0n1): ext4_find_entry:1436: | |
67 | inode #2: comm cp: reading directory lblock 0 | |
68 | ||
69 | Example 2: Inject default status code with retry | |
70 | ------------------------------------------------ | |
71 | ||
72 | mount /dev/nvme0n1 /mnt | |
73 | echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/times | |
74 | echo 100 > /sys/kernel/debug/nvme0n1/fault_inject/probability | |
75 | echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/status | |
76 | echo 0 > /sys/kernel/debug/nvme0n1/fault_inject/dont_retry | |
77 | ||
78 | cp a.file /mnt | |
79 | ||
80 | Expected Result: | |
81 | ||
82 | command success without error | |
83 | ||
84 | Message from dmesg: | |
85 | ||
86 | FAULT_INJECTION: forcing a failure. | |
87 | name fault_inject, interval 1, probability 100, space 0, times 1 | |
88 | CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-rc8+ #4 | |
89 | Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 | |
90 | Call Trace: | |
91 | <IRQ> | |
92 | dump_stack+0x5c/0x7d | |
93 | should_fail+0x148/0x170 | |
94 | nvme_should_fail+0x30/0x60 [nvme_core] | |
95 | nvme_loop_queue_response+0x84/0x110 [nvme_loop] | |
96 | nvmet_req_complete+0x11/0x40 [nvmet] | |
97 | nvmet_bio_done+0x28/0x40 [nvmet] | |
98 | blk_update_request+0xb0/0x310 | |
99 | blk_mq_end_request+0x18/0x60 | |
100 | flush_smp_call_function_queue+0x3d/0xf0 | |
101 | smp_call_function_single_interrupt+0x2c/0xc0 | |
102 | call_function_single_interrupt+0xa2/0xb0 | |
103 | </IRQ> | |
104 | RIP: 0010:native_safe_halt+0x2/0x10 | |
105 | RSP: 0018:ffffc9000068bec0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff04 | |
106 | RAX: ffffffff817a10c0 RBX: ffff88011a3c9680 RCX: 0000000000000000 | |
107 | RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 | |
108 | RBP: 0000000000000001 R08: 000000008e38c131 R09: 0000000000000000 | |
109 | R10: 0000000000000000 R11: 0000000000000000 R12: ffff88011a3c9680 | |
110 | R13: ffff88011a3c9680 R14: 0000000000000000 R15: 0000000000000000 | |
111 | ? __sched_text_end+0x4/0x4 | |
112 | default_idle+0x18/0xf0 | |
113 | do_idle+0x150/0x1d0 | |
114 | cpu_startup_entry+0x6f/0x80 | |
115 | start_secondary+0x187/0x1e0 | |
116 | secondary_startup_64+0xa5/0xb0 | |
7e31d821 AM |
117 | |
118 | Example 3: Inject an error into the 10th admin command | |
119 | ------------------------------------------------------ | |
120 | ||
121 | echo 100 > /sys/kernel/debug/nvme0/fault_inject/probability | |
122 | echo 10 > /sys/kernel/debug/nvme0/fault_inject/space | |
123 | echo 1 > /sys/kernel/debug/nvme0/fault_inject/times | |
124 | nvme reset /dev/nvme0 | |
125 | ||
126 | Expected Result: | |
127 | ||
128 | After NVMe controller reset, the reinitialization may or may not succeed. | |
129 | It depends on which admin command is actually forced to fail. | |
130 | ||
131 | Message from dmesg: | |
132 | ||
133 | nvme nvme0: resetting controller | |
134 | FAULT_INJECTION: forcing a failure. | |
135 | name fault_inject, interval 1, probability 100, space 1, times 1 | |
136 | CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.2.0-rc2+ #2 | |
137 | Hardware name: MSI MS-7A45/B150M MORTAR ARCTIC (MS-7A45), BIOS 1.50 04/25/2017 | |
138 | Call Trace: | |
139 | <IRQ> | |
140 | dump_stack+0x63/0x85 | |
141 | should_fail+0x14a/0x170 | |
142 | nvme_should_fail+0x38/0x80 [nvme_core] | |
143 | nvme_irq+0x129/0x280 [nvme] | |
144 | ? blk_mq_end_request+0xb3/0x120 | |
145 | __handle_irq_event_percpu+0x84/0x1a0 | |
146 | handle_irq_event_percpu+0x32/0x80 | |
147 | handle_irq_event+0x3b/0x60 | |
148 | handle_edge_irq+0x7f/0x1a0 | |
149 | handle_irq+0x20/0x30 | |
150 | do_IRQ+0x4e/0xe0 | |
151 | common_interrupt+0xf/0xf | |
152 | </IRQ> | |
153 | RIP: 0010:cpuidle_enter_state+0xc5/0x460 | |
154 | Code: ff e8 8f 5f 86 ff 80 7d c7 00 74 17 9c 58 0f 1f 44 00 00 f6 c4 02 0f 85 69 03 00 00 31 ff e8 62 aa 8c ff fb 66 0f 1f 44 00 00 <45> 85 ed 0f 88 37 03 00 00 4c 8b 45 d0 4c 2b 45 b8 48 ba cf f7 53 | |
155 | RSP: 0018:ffffffff88c03dd0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffdc | |
156 | RAX: ffff9dac25a2ac80 RBX: ffffffff88d53760 RCX: 000000000000001f | |
157 | RDX: 0000000000000000 RSI: 000000002d958403 RDI: 0000000000000000 | |
158 | RBP: ffffffff88c03e18 R08: fffffff75e35ffb7 R09: 00000a49a56c0b48 | |
159 | R10: ffffffff88c03da0 R11: 0000000000001b0c R12: ffff9dac25a34d00 | |
160 | R13: 0000000000000006 R14: 0000000000000006 R15: ffffffff88d53760 | |
161 | cpuidle_enter+0x2e/0x40 | |
162 | call_cpuidle+0x23/0x40 | |
163 | do_idle+0x201/0x280 | |
164 | cpu_startup_entry+0x1d/0x20 | |
165 | rest_init+0xaa/0xb0 | |
166 | arch_call_rest_init+0xe/0x1b | |
167 | start_kernel+0x51c/0x53b | |
168 | x86_64_start_reservations+0x24/0x26 | |
169 | x86_64_start_kernel+0x74/0x77 | |
170 | secondary_startup_64+0xa4/0xb0 | |
171 | nvme nvme0: Could not set queue count (16385) | |
172 | nvme nvme0: IO queues not created |