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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2019-06-09 16:17:02 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-06-21 11:15:50 +0200 |
| commit | 7e31d8215fd8cb1c13b47e23f1136545010e00de (patch) | |
| tree | 2712725ce3e9207337b9dbf53e0a3f4e050af8c9 /Documentation/fault-injection | |
| parent | nvme: enable to inject errors into admin commands (diff) | |
| download | linux-7e31d8215fd8cb1c13b47e23f1136545010e00de.tar.xz linux-7e31d8215fd8cb1c13b47e23f1136545010e00de.zip | |
Documentation: nvme: add an example for nvme fault injection
This adds an example of how to inject errors into admin commands.
Suggested-by: Thomas Tai <thomas.tai@oracle.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Minwoo Im <minwoo.im@samsung.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'Documentation/fault-injection')
| -rw-r--r-- | Documentation/fault-injection/nvme-fault-injection.txt | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/Documentation/fault-injection/nvme-fault-injection.txt b/Documentation/fault-injection/nvme-fault-injection.txt index 8fbf3bf60b62..efcb339a3add 100644 --- a/Documentation/fault-injection/nvme-fault-injection.txt +++ b/Documentation/fault-injection/nvme-fault-injection.txt @@ -114,3 +114,59 @@ R13: ffff88011a3c9680 R14: 0000000000000000 R15: 0000000000000000 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: + +After NVMe controller reset, the reinitialization may or may not succeed. +It depends on which admin command is actually forced to fail. + +Message from dmesg: + +nvme nvme0: resetting controller +FAULT_INJECTION: forcing a failure. +name fault_inject, interval 1, probability 100, space 1, times 1 +CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.2.0-rc2+ #2 +Hardware name: MSI MS-7A45/B150M MORTAR ARCTIC (MS-7A45), BIOS 1.50 04/25/2017 +Call Trace: + <IRQ> + dump_stack+0x63/0x85 + should_fail+0x14a/0x170 + nvme_should_fail+0x38/0x80 [nvme_core] + nvme_irq+0x129/0x280 [nvme] + ? blk_mq_end_request+0xb3/0x120 + __handle_irq_event_percpu+0x84/0x1a0 + handle_irq_event_percpu+0x32/0x80 + handle_irq_event+0x3b/0x60 + handle_edge_irq+0x7f/0x1a0 + handle_irq+0x20/0x30 + do_IRQ+0x4e/0xe0 + common_interrupt+0xf/0xf + </IRQ> +RIP: 0010:cpuidle_enter_state+0xc5/0x460 +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 +RSP: 0018:ffffffff88c03dd0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffdc +RAX: ffff9dac25a2ac80 RBX: ffffffff88d53760 RCX: 000000000000001f +RDX: 0000000000000000 RSI: 000000002d958403 RDI: 0000000000000000 +RBP: ffffffff88c03e18 R08: fffffff75e35ffb7 R09: 00000a49a56c0b48 +R10: ffffffff88c03da0 R11: 0000000000001b0c R12: ffff9dac25a34d00 +R13: 0000000000000006 R14: 0000000000000006 R15: ffffffff88d53760 + cpuidle_enter+0x2e/0x40 + call_cpuidle+0x23/0x40 + do_idle+0x201/0x280 + cpu_startup_entry+0x1d/0x20 + rest_init+0xaa/0xb0 + arch_call_rest_init+0xe/0x1b + start_kernel+0x51c/0x53b + x86_64_start_reservations+0x24/0x26 + x86_64_start_kernel+0x74/0x77 + secondary_startup_64+0xa4/0xb0 +nvme nvme0: Could not set queue count (16385) +nvme nvme0: IO queues not created |