* Bug report: AER driver deadlock
@ 2019-06-04 3:25 Fangjian (Turing)
2019-06-04 14:34 ` Sinan Kaya
2019-06-25 17:16 ` Bjorn Helgaas
0 siblings, 2 replies; 8+ messages in thread
From: Fangjian (Turing) @ 2019-06-04 3:25 UTC (permalink / raw)
To: linux-pci; +Cc: Bjorn Helgaas, Rafael J. Wysocki
Hi, We met a deadlock triggered by a NONFATAL AER event during a sysfs
"sriov_numvfs" operation. Any suggestion to fix such deadlock ?
enable one VF
# echo 1 > /sys/devices/pci0000:74/0000:74:00.0/0000:75:00.0/sriov_numvfs
The sysfs "sriov_numvfs" side is:
sriov_numvfs_store
device_lock # hold the device_lock
...
pci_enable_sriov
sriov_enable
...
pci_device_add
down_write(&pci_bus_sem) # wait for up_read(&pci_bus_sem)
The AER side is:
pcie_do_recovery
pci_walk_bus
down_read(&pci_bus_sem) # hold the rw_semaphore
report_resume
device_lock # wait for device_unlock()
The calltrace is as below:
[ 258.411464] INFO: task kworker/0:1:13 blocked for more than 120 seconds.
[ 258.418139] Tainted: G C O 5.1.0-rc1-ge2e3ca0 #1
[ 258.424379] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 258.432172] kworker/0:1 D 0 13 2 0x00000028
[ 258.437640] Workqueue: events aer_recover_work_func
[ 258.442496] Call trace:
[ 258.444933] __switch_to+0xb4/0x1b8
[ 258.448409] __schedule+0x1ec/0x720
[ 258.451884] schedule+0x38/0x90
[ 258.455012] schedule_preempt_disabled+0x20/0x38
[ 258.459610] __mutex_lock.isra.1+0x150/0x518
[ 258.463861] __mutex_lock_slowpath+0x10/0x18
[ 258.468112] mutex_lock+0x34/0x40
[ 258.471413] report_resume+0x1c/0x78
[ 258.474973] pci_walk_bus+0x58/0xb0
[ 258.478451] pcie_do_recovery+0x18c/0x248
[ 258.482445] aer_recover_work_func+0xe0/0x118
[ 258.486783] process_one_work+0x1e4/0x468
[ 258.490776] worker_thread+0x40/0x450
[ 258.494424] kthread+0x128/0x130
[ 258.497639] ret_from_fork+0x10/0x1c
[ 258.501329] INFO: task flr.sh:4534 blocked for more than 120 seconds.
[ 258.507742] Tainted: G C O 5.1.0-rc1-ge2e3ca0 #1
[ 258.513980] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 258.521774] flr.sh D 0 4534 4504 0x00000000
[ 258.527235] Call trace:
[ 258.529671] __switch_to+0xb4/0x1b8
[ 258.533146] __schedule+0x1ec/0x720
[ 258.536619] schedule+0x38/0x90
[ 258.539749] rwsem_down_write_failed+0x14c/0x210
[ 258.544347] down_write+0x48/0x60
[ 258.547648] pci_device_add+0x1a0/0x290
[ 258.551469] pci_iov_add_virtfn+0x190/0x358
[ 258.555633] sriov_enable+0x24c/0x480
[ 258.559279] pci_enable_sriov+0x14/0x28
[ 258.563101] hisi_zip_sriov_configure+0x64/0x100 [hisi_zip]
[ 258.568649] sriov_numvfs_store+0xc4/0x190
[ 258.572728] dev_attr_store+0x18/0x28
[ 258.576375] sysfs_kf_write+0x3c/0x50
[ 258.580024] kernfs_fop_write+0x114/0x1d8
[ 258.584018] __vfs_write+0x18/0x38
[ 258.587404] vfs_write+0xa4/0x1b0
[ 258.590705] ksys_write+0x60/0xd8
[ 258.594007] __arm64_sys_write+0x18/0x20
[ 258.597914] el0_svc_common+0x5c/0x100
[ 258.601646] el0_svc_handler+0x2c/0x80
[ 258.605381] el0_svc+0x8/0xc
[ 379.243461] INFO: task kworker/0:1:13 blocked for more than 241 seconds.
[ 379.250134] Tainted: G C O 5.1.0-rc1-ge2e3ca0 #1
[ 379.256373] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Thank you,
Jay
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Bug report: AER driver deadlock
2019-06-04 3:25 Bug report: AER driver deadlock Fangjian (Turing)
@ 2019-06-04 14:34 ` Sinan Kaya
2019-06-04 23:47 ` Benjamin Herrenschmidt
2019-06-25 17:16 ` Bjorn Helgaas
1 sibling, 1 reply; 8+ messages in thread
From: Sinan Kaya @ 2019-06-04 14:34 UTC (permalink / raw)
To: Fangjian (Turing); +Cc: linux-pci, Bjorn Helgaas, Rafael J. Wysocki
On 6/3/19, Fangjian (Turing) <f.fangjian@huawei.com> wrote:
> Hi, We met a deadlock triggered by a NONFATAL AER event during a sysfs
> "sriov_numvfs" operation. Any suggestion to fix such deadlock ?
>
> enable one VF
> # echo 1 > /sys/devices/pci0000:74/0000:74:00.0/0000:75:00.0/sriov_numvfs
>
> The sysfs "sriov_numvfs" side is:
>
> sriov_numvfs_store
> device_lock # hold the device_lock
> ...
> pci_enable_sriov
> sriov_enable
> ...
> pci_device_add
> down_write(&pci_bus_sem) # wait for
> up_read(&pci_bus_sem)
>
> The AER side is:
>
> pcie_do_recovery
> pci_walk_bus
> down_read(&pci_bus_sem) # hold the rw_semaphore
> report_resume
Should we replace these device lock with try lock loop with some sleep
statements. This could solve the immediate deadlock issues until
someone implements granular locking in pci.
> device_lock # wait for device_unlock()
>
> The calltrace is as below:
>
> [ 258.411464] INFO: task kworker/0:1:13 blocked for more than 120 seconds.
> [ 258.418139] Tainted: G C O 5.1.0-rc1-ge2e3ca0 #1
> [ 258.424379] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
> this message.
> [ 258.432172] kworker/0:1 D 0 13 2 0x00000028
> [ 258.437640] Workqueue: events aer_recover_work_func
> [ 258.442496] Call trace:
> [ 258.444933] __switch_to+0xb4/0x1b8
> [ 258.448409] __schedule+0x1ec/0x720
> [ 258.451884] schedule+0x38/0x90
> [ 258.455012] schedule_preempt_disabled+0x20/0x38
> [ 258.459610] __mutex_lock.isra.1+0x150/0x518
> [ 258.463861] __mutex_lock_slowpath+0x10/0x18
> [ 258.468112] mutex_lock+0x34/0x40
> [ 258.471413] report_resume+0x1c/0x78
> [ 258.474973] pci_walk_bus+0x58/0xb0
> [ 258.478451] pcie_do_recovery+0x18c/0x248
> [ 258.482445] aer_recover_work_func+0xe0/0x118
> [ 258.486783] process_one_work+0x1e4/0x468
> [ 258.490776] worker_thread+0x40/0x450
> [ 258.494424] kthread+0x128/0x130
> [ 258.497639] ret_from_fork+0x10/0x1c
> [ 258.501329] INFO: task flr.sh:4534 blocked for more than 120 seconds.
> [ 258.507742] Tainted: G C O 5.1.0-rc1-ge2e3ca0 #1
> [ 258.513980] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
> this message.
> [ 258.521774] flr.sh D 0 4534 4504 0x00000000
> [ 258.527235] Call trace:
> [ 258.529671] __switch_to+0xb4/0x1b8
> [ 258.533146] __schedule+0x1ec/0x720
> [ 258.536619] schedule+0x38/0x90
> [ 258.539749] rwsem_down_write_failed+0x14c/0x210
> [ 258.544347] down_write+0x48/0x60
> [ 258.547648] pci_device_add+0x1a0/0x290
> [ 258.551469] pci_iov_add_virtfn+0x190/0x358
> [ 258.555633] sriov_enable+0x24c/0x480
> [ 258.559279] pci_enable_sriov+0x14/0x28
> [ 258.563101] hisi_zip_sriov_configure+0x64/0x100 [hisi_zip]
> [ 258.568649] sriov_numvfs_store+0xc4/0x190
> [ 258.572728] dev_attr_store+0x18/0x28
> [ 258.576375] sysfs_kf_write+0x3c/0x50
> [ 258.580024] kernfs_fop_write+0x114/0x1d8
> [ 258.584018] __vfs_write+0x18/0x38
> [ 258.587404] vfs_write+0xa4/0x1b0
> [ 258.590705] ksys_write+0x60/0xd8
> [ 258.594007] __arm64_sys_write+0x18/0x20
> [ 258.597914] el0_svc_common+0x5c/0x100
> [ 258.601646] el0_svc_handler+0x2c/0x80
> [ 258.605381] el0_svc+0x8/0xc
> [ 379.243461] INFO: task kworker/0:1:13 blocked for more than 241 seconds.
> [ 379.250134] Tainted: G C O 5.1.0-rc1-ge2e3ca0 #1
> [ 379.256373] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
> this message.
>
>
> Thank you,
> Jay
>
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Bug report: AER driver deadlock
2019-06-04 14:34 ` Sinan Kaya
@ 2019-06-04 23:47 ` Benjamin Herrenschmidt
2019-06-05 0:59 ` Sinan Kaya
2019-06-20 3:14 ` Fangjian (Turing)
0 siblings, 2 replies; 8+ messages in thread
From: Benjamin Herrenschmidt @ 2019-06-04 23:47 UTC (permalink / raw)
To: Sinan Kaya, Fangjian (Turing); +Cc: linux-pci, Bjorn Helgaas, Rafael J. Wysocki
On Tue, 2019-06-04 at 10:34 -0400, Sinan Kaya wrote:
> On 6/3/19, Fangjian (Turing) <f.fangjian@huawei.com> wrote:
> > Hi, We met a deadlock triggered by a NONFATAL AER event during a sysfs
> > "sriov_numvfs" operation. Any suggestion to fix such deadlock ?
> >
> > enable one VF
> > # echo 1 > /sys/devices/pci0000:74/0000:74:00.0/0000:75:00.0/sriov_numvfs
> >
> > The sysfs "sriov_numvfs" side is:
> >
> > sriov_numvfs_store
> > device_lock # hold the device_lock
> > ...
> > pci_enable_sriov
> > sriov_enable
> > ...
> > pci_device_add
> > down_write(&pci_bus_sem) # wait for
> > up_read(&pci_bus_sem)
> >
> > The AER side is:
> >
> > pcie_do_recovery
> > pci_walk_bus
> > down_read(&pci_bus_sem) # hold the rw_semaphore
> > report_resume
>
> Should we replace these device lock with try lock loop with some sleep
> statements. This could solve the immediate deadlock issues until
> someone implements granular locking in pci.
That won't necessarily solve this AB->BA problem. I think the issue
here is that sriov shouldn't device_lock before doing something that
can take the pci_bus_sem.
Ben.
> > device_lock # wait for device_unlock()
> >
> > The calltrace is as below:
> >
> > [ 258.411464] INFO: task kworker/0:1:13 blocked for more than 120 seconds.
> > [ 258.418139] Tainted: G C O 5.1.0-rc1-ge2e3ca0 #1
> > [ 258.424379] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
> > this message.
> > [ 258.432172] kworker/0:1 D 0 13 2 0x00000028
> > [ 258.437640] Workqueue: events aer_recover_work_func
> > [ 258.442496] Call trace:
> > [ 258.444933] __switch_to+0xb4/0x1b8
> > [ 258.448409] __schedule+0x1ec/0x720
> > [ 258.451884] schedule+0x38/0x90
> > [ 258.455012] schedule_preempt_disabled+0x20/0x38
> > [ 258.459610] __mutex_lock.isra.1+0x150/0x518
> > [ 258.463861] __mutex_lock_slowpath+0x10/0x18
> > [ 258.468112] mutex_lock+0x34/0x40
> > [ 258.471413] report_resume+0x1c/0x78
> > [ 258.474973] pci_walk_bus+0x58/0xb0
> > [ 258.478451] pcie_do_recovery+0x18c/0x248
> > [ 258.482445] aer_recover_work_func+0xe0/0x118
> > [ 258.486783] process_one_work+0x1e4/0x468
> > [ 258.490776] worker_thread+0x40/0x450
> > [ 258.494424] kthread+0x128/0x130
> > [ 258.497639] ret_from_fork+0x10/0x1c
> > [ 258.501329] INFO: task flr.sh:4534 blocked for more than 120 seconds.
> > [ 258.507742] Tainted: G C O 5.1.0-rc1-ge2e3ca0 #1
> > [ 258.513980] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
> > this message.
> > [ 258.521774] flr.sh D 0 4534 4504 0x00000000
> > [ 258.527235] Call trace:
> > [ 258.529671] __switch_to+0xb4/0x1b8
> > [ 258.533146] __schedule+0x1ec/0x720
> > [ 258.536619] schedule+0x38/0x90
> > [ 258.539749] rwsem_down_write_failed+0x14c/0x210
> > [ 258.544347] down_write+0x48/0x60
> > [ 258.547648] pci_device_add+0x1a0/0x290
> > [ 258.551469] pci_iov_add_virtfn+0x190/0x358
> > [ 258.555633] sriov_enable+0x24c/0x480
> > [ 258.559279] pci_enable_sriov+0x14/0x28
> > [ 258.563101] hisi_zip_sriov_configure+0x64/0x100 [hisi_zip]
> > [ 258.568649] sriov_numvfs_store+0xc4/0x190
> > [ 258.572728] dev_attr_store+0x18/0x28
> > [ 258.576375] sysfs_kf_write+0x3c/0x50
> > [ 258.580024] kernfs_fop_write+0x114/0x1d8
> > [ 258.584018] __vfs_write+0x18/0x38
> > [ 258.587404] vfs_write+0xa4/0x1b0
> > [ 258.590705] ksys_write+0x60/0xd8
> > [ 258.594007] __arm64_sys_write+0x18/0x20
> > [ 258.597914] el0_svc_common+0x5c/0x100
> > [ 258.601646] el0_svc_handler+0x2c/0x80
> > [ 258.605381] el0_svc+0x8/0xc
> > [ 379.243461] INFO: task kworker/0:1:13 blocked for more than 241 seconds.
> > [ 379.250134] Tainted: G C O 5.1.0-rc1-ge2e3ca0 #1
> > [ 379.256373] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
> > this message.
> >
> >
> > Thank you,
> > Jay
> >
> >
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Bug report: AER driver deadlock
2019-06-04 23:47 ` Benjamin Herrenschmidt
@ 2019-06-05 0:59 ` Sinan Kaya
2019-06-20 3:14 ` Fangjian (Turing)
1 sibling, 0 replies; 8+ messages in thread
From: Sinan Kaya @ 2019-06-05 0:59 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Fangjian (Turing)
Cc: linux-pci, Bjorn Helgaas, Rafael J. Wysocki
On 6/4/2019 7:47 PM, Benjamin Herrenschmidt wrote:
>> Should we replace these device lock with try lock loop with some sleep
>> statements. This could solve the immediate deadlock issues until
>> someone implements granular locking in pci.
> That won't necessarily solve this AB->BA problem. I think the issue
> here is that sriov shouldn't device_lock before doing something that
> can take the pci_bus_sem.
>
I agree. I found out about lock ordering issue after reading the email
one more time.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Bug report: AER driver deadlock
2019-06-04 23:47 ` Benjamin Herrenschmidt
2019-06-05 0:59 ` Sinan Kaya
@ 2019-06-20 3:14 ` Fangjian (Turing)
1 sibling, 0 replies; 8+ messages in thread
From: Fangjian (Turing) @ 2019-06-20 3:14 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Sinan Kaya
Cc: linux-pci, Bjorn Helgaas, Rafael J. Wysocki
Hi,
Are there any further advice?
On 2019/6/5 7:47, Benjamin Herrenschmidt wrote:
> On Tue, 2019-06-04 at 10:34 -0400, Sinan Kaya wrote:
>> On 6/3/19, Fangjian (Turing) <f.fangjian@huawei.com> wrote:
>>> Hi, We met a deadlock triggered by a NONFATAL AER event during a sysfs
>>> "sriov_numvfs" operation. Any suggestion to fix such deadlock ?
>>>
>>> enable one VF
>>> # echo 1 > /sys/devices/pci0000:74/0000:74:00.0/0000:75:00.0/sriov_numvfs
>>>
>>> The sysfs "sriov_numvfs" side is:
>>>
>>> sriov_numvfs_store
>>> device_lock # hold the device_lock
>>> ...
>>> pci_enable_sriov
>>> sriov_enable
>>> ...
>>> pci_device_add
>>> down_write(&pci_bus_sem) # wait for
>>> up_read(&pci_bus_sem)
>>>
>>> The AER side is:
>>>
>>> pcie_do_recovery
>>> pci_walk_bus
>>> down_read(&pci_bus_sem) # hold the rw_semaphore
>>> report_resume
>>
>> Should we replace these device lock with try lock loop with some sleep
>> statements. This could solve the immediate deadlock issues until
>> someone implements granular locking in pci.
>
> That won't necessarily solve this AB->BA problem. I think the issue
> here is that sriov shouldn't device_lock before doing something that
> can take the pci_bus_sem.
>
> Ben.
>
>
>>> device_lock # wait for device_unlock()
>>>
>>> The calltrace is as below:
>>>
>>> [ 258.411464] INFO: task kworker/0:1:13 blocked for more than 120 seconds.
>>> [ 258.418139] Tainted: G C O 5.1.0-rc1-ge2e3ca0 #1
>>> [ 258.424379] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
>>> this message.
>>> [ 258.432172] kworker/0:1 D 0 13 2 0x00000028
>>> [ 258.437640] Workqueue: events aer_recover_work_func
>>> [ 258.442496] Call trace:
>>> [ 258.444933] __switch_to+0xb4/0x1b8
>>> [ 258.448409] __schedule+0x1ec/0x720
>>> [ 258.451884] schedule+0x38/0x90
>>> [ 258.455012] schedule_preempt_disabled+0x20/0x38
>>> [ 258.459610] __mutex_lock.isra.1+0x150/0x518
>>> [ 258.463861] __mutex_lock_slowpath+0x10/0x18
>>> [ 258.468112] mutex_lock+0x34/0x40
>>> [ 258.471413] report_resume+0x1c/0x78
>>> [ 258.474973] pci_walk_bus+0x58/0xb0
>>> [ 258.478451] pcie_do_recovery+0x18c/0x248
>>> [ 258.482445] aer_recover_work_func+0xe0/0x118
>>> [ 258.486783] process_one_work+0x1e4/0x468
>>> [ 258.490776] worker_thread+0x40/0x450
>>> [ 258.494424] kthread+0x128/0x130
>>> [ 258.497639] ret_from_fork+0x10/0x1c
>>> [ 258.501329] INFO: task flr.sh:4534 blocked for more than 120 seconds.
>>> [ 258.507742] Tainted: G C O 5.1.0-rc1-ge2e3ca0 #1
>>> [ 258.513980] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
>>> this message.
>>> [ 258.521774] flr.sh D 0 4534 4504 0x00000000
>>> [ 258.527235] Call trace:
>>> [ 258.529671] __switch_to+0xb4/0x1b8
>>> [ 258.533146] __schedule+0x1ec/0x720
>>> [ 258.536619] schedule+0x38/0x90
>>> [ 258.539749] rwsem_down_write_failed+0x14c/0x210
>>> [ 258.544347] down_write+0x48/0x60
>>> [ 258.547648] pci_device_add+0x1a0/0x290
>>> [ 258.551469] pci_iov_add_virtfn+0x190/0x358
>>> [ 258.555633] sriov_enable+0x24c/0x480
>>> [ 258.559279] pci_enable_sriov+0x14/0x28
>>> [ 258.563101] hisi_zip_sriov_configure+0x64/0x100 [hisi_zip]
>>> [ 258.568649] sriov_numvfs_store+0xc4/0x190
>>> [ 258.572728] dev_attr_store+0x18/0x28
>>> [ 258.576375] sysfs_kf_write+0x3c/0x50
>>> [ 258.580024] kernfs_fop_write+0x114/0x1d8
>>> [ 258.584018] __vfs_write+0x18/0x38
>>> [ 258.587404] vfs_write+0xa4/0x1b0
>>> [ 258.590705] ksys_write+0x60/0xd8
>>> [ 258.594007] __arm64_sys_write+0x18/0x20
>>> [ 258.597914] el0_svc_common+0x5c/0x100
>>> [ 258.601646] el0_svc_handler+0x2c/0x80
>>> [ 258.605381] el0_svc+0x8/0xc
>>> [ 379.243461] INFO: task kworker/0:1:13 blocked for more than 241 seconds.
>>> [ 379.250134] Tainted: G C O 5.1.0-rc1-ge2e3ca0 #1
>>> [ 379.256373] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
>>> this message.
>>>
>>>
>>> Thank you,
>>> Jay
>>>
>>>
>
>
> .
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Bug report: AER driver deadlock
2019-06-04 3:25 Bug report: AER driver deadlock Fangjian (Turing)
2019-06-04 14:34 ` Sinan Kaya
@ 2019-06-25 17:16 ` Bjorn Helgaas
2019-08-05 12:43 ` Fangjian (Turing)
1 sibling, 1 reply; 8+ messages in thread
From: Bjorn Helgaas @ 2019-06-25 17:16 UTC (permalink / raw)
To: Fangjian (Turing); +Cc: linux-pci, Rafael J. Wysocki
On Tue, Jun 04, 2019 at 11:25:44AM +0800, Fangjian (Turing) wrote:
> Hi, We met a deadlock triggered by a NONFATAL AER event during a sysfs
> "sriov_numvfs" operation. Any suggestion to fix such deadlock ?
Here's a bugzilla report for this; please reference it and this email
thread in any patches to fix it:
https://bugzilla.kernel.org/show_bug.cgi?id=203981
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Bug report: AER driver deadlock
2019-06-25 17:16 ` Bjorn Helgaas
@ 2019-08-05 12:43 ` Fangjian (Turing)
2019-08-16 7:11 ` Jay Fang
0 siblings, 1 reply; 8+ messages in thread
From: Fangjian (Turing) @ 2019-08-05 12:43 UTC (permalink / raw)
To: Bjorn Helgaas; +Cc: linux-pci, Rafael J. Wysocki
Kindly Ping...
Best Regards,
Jay
On 2019/6/26 1:16, Bjorn Helgaas wrote:
> On Tue, Jun 04, 2019 at 11:25:44AM +0800, Fangjian (Turing) wrote:
>> Hi, We met a deadlock triggered by a NONFATAL AER event during a sysfs
>> "sriov_numvfs" operation. Any suggestion to fix such deadlock ?
>
> Here's a bugzilla report for this; please reference it and this email
> thread in any patches to fix it:
>
> https://bugzilla.kernel.org/show_bug.cgi?id=203981
>
> .
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Bug report: AER driver deadlock
2019-08-05 12:43 ` Fangjian (Turing)
@ 2019-08-16 7:11 ` Jay Fang
0 siblings, 0 replies; 8+ messages in thread
From: Jay Fang @ 2019-08-16 7:11 UTC (permalink / raw)
To: Bjorn Helgaas; +Cc: linux-pci, Rafael J. Wysocki
Ping...
Best Regards,
Jay
On 2019/8/5 20:43, Fangjian (Turing) wrote:
> Kindly Ping...
>
>
>
> Best Regards,
> Jay
>
> On 2019/6/26 1:16, Bjorn Helgaas wrote:
>> On Tue, Jun 04, 2019 at 11:25:44AM +0800, Fangjian (Turing) wrote:
>>> Hi, We met a deadlock triggered by a NONFATAL AER event during a sysfs
>>> "sriov_numvfs" operation. Any suggestion to fix such deadlock ?
>>
>> Here's a bugzilla report for this; please reference it and this email
>> thread in any patches to fix it:
>>
>> https://bugzilla.kernel.org/show_bug.cgi?id=203981
>>
>> .
>>
>
>
> .
>
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2019-08-16 7:11 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-06-04 3:25 Bug report: AER driver deadlock Fangjian (Turing)
2019-06-04 14:34 ` Sinan Kaya
2019-06-04 23:47 ` Benjamin Herrenschmidt
2019-06-05 0:59 ` Sinan Kaya
2019-06-20 3:14 ` Fangjian (Turing)
2019-06-25 17:16 ` Bjorn Helgaas
2019-08-05 12:43 ` Fangjian (Turing)
2019-08-16 7:11 ` Jay Fang
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