2eb81a3364
nvme_end_request is a bit misnamed, as it wraps around the blk_mq_complete_* API. It's semantics also are non-trivial, so give it a more descriptive name and add a comment explaining the semantics. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@kernel.dk>
179 lines
6.4 KiB
ReStructuredText
179 lines
6.4 KiB
ReStructuredText
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_try_complete_req. 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
|
||
|
||
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
|