Re: [BUG] Hang (deadlock?) inside iscsi_if_rx
On Wed, 2012-01-25 at 20:20 -0600, Mike Christie wrote:
On 01/25/2012 08:17 PM, Mike Christie wrote:
On 01/24/2012 10:51 AM, Sasha Levin wrote:
On Tue, Jan 24, 2012 at 11:29 AM, Mike Christie micha...@cs.wisc.edu
wrote:
On 01/24/2012 08:30 AM, Sasha Levin wrote:
Hi all,
I got the following hang when running trinity under KVM tool:
[ 2520.824250] INFO: task trinity:31986 blocked for more than 120
seconds.
[ 2520.825513] echo 0 /proc/sys/kernel/hung_task_timeout_secs
disables this message.
[ 2520.826983] trinity D 5504 31986 2767
0x0004
[ 2520.828416] 88000a21ba98 0086 88000a3f8000
88000a3f8000
[ 2520.829892] 001d4340 88000a21bfd8 88000a21a000
001d4340
[ 2520.831380] 001d4340 001d4340 88000a21bfd8
001d4340
[ 2520.832838] Call Trace:
[ 2520.837089] [8265297a] schedule+0x3a/0x50
[ 2520.837983] [82651049] __mutex_lock_common+0x209/0x5b0
[ 2520.839181] [81af64f3] ? iscsi_if_rx+0x23/0xa00
[ 2520.840232] [81053943] ? sched_clock+0x13/0x20
[ 2520.841242] [81af64f3] ? iscsi_if_rx+0x23/0xa00
[ 2520.842271] [82651430] mutex_lock_nested+0x40/0x50
[ 2520.843353] [81af64f3] iscsi_if_rx+0x23/0xa00
[ 2520.844461] [810dfffd] ? sub_preempt_count+0x9d/0xd0
[ 2520.845576] [82654130] ? _raw_read_unlock+0x30/0x60
[ 2520.846705] [8221632e] netlink_unicast+0x1ae/0x1f0
[ 2520.847790] [82216ae7] netlink_sendmsg+0x227/0x350
[ 2520.848884] [821a490d] ? sock_update_netprioidx+0xdd/0x1b0
[ 2520.850105] [821a4882] ? sock_update_netprioidx+0x52/0x1b0
[ 2520.851282] [8219e376] sock_aio_write+0x166/0x180
[ 2520.852317] [810dfe51] ? get_parent_ip+0x11/0x50
[ 2520.853342] [811d0b1a] do_sync_write+0xda/0x120
[ 2520.854347] [81109c42] ? lock_release_holdtime+0xb2/0x160
[ 2520.855533] [810dfe51] ? get_parent_ip+0x11/0x50
[ 2520.856569] [817914e7] ? security_file_permission+0x27/0xb0
[ 2520.857756] [811d0ccc] vfs_write+0x16c/0x180
[ 2520.858713] [811d0dcf] sys_write+0x4f/0xa0
[ 2520.859680] [826553f9] system_call_fastpath+0x16/0x1b
[ 2520.873039] 1 lock held by trinity/31986:
[ 2520.873801] #0: (rx_queue_mutex){+.+...}, at: [81af64f3]
iscsi_if_rx+0x23/0xa00
[ 2520.875587] Kernel panic - not syncing: hung_task: blocked tasks
From looking at the logs, there were two instances of the fuzzer blocked
on a write() to a netlink socket. There are no iSCSI targets anywhere on
the network.
What does the trinity test do? Does it write random junk to netlink
sockets to test the kernel handlers or were you actually stressing the
creation of targets. If the latter what driver were you trying to create
targets with (iscsi_tcp, bnx2i, etc)?
It basically just writes junk into sockets. In this case it was just a
large chunk of it written into the netlink socket.
Could you tell me what arguments you used?
And what kernel was this with?
It was the linux-next kernel from that day, I can't find the logs of
that socket though, will have to recreate it.
I did debug the issue and found it's the result of iscsi_if_send_reply
returning -ESRCH which makes us hang in the do {} while(); loop forever.
I've sent a patch to deal with that.
--
Sasha.
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Re: [BUG] Hang (deadlock?) inside iscsi_if_rx
On Tue, Jan 24, 2012 at 11:29 AM, Mike Christie micha...@cs.wisc.edu wrote:
On 01/24/2012 08:30 AM, Sasha Levin wrote:
Hi all,
I got the following hang when running trinity under KVM tool:
[ 2520.824250] INFO: task trinity:31986 blocked for more than 120 seconds.
[ 2520.825513] echo 0 /proc/sys/kernel/hung_task_timeout_secs disables
this message.
[ 2520.826983] trinity D 5504 31986 2767
0x0004
[ 2520.828416] 88000a21ba98 0086 88000a3f8000
88000a3f8000
[ 2520.829892] 001d4340 88000a21bfd8 88000a21a000
001d4340
[ 2520.831380] 001d4340 001d4340 88000a21bfd8
001d4340
[ 2520.832838] Call Trace:
[ 2520.837089] [8265297a] schedule+0x3a/0x50
[ 2520.837983] [82651049] __mutex_lock_common+0x209/0x5b0
[ 2520.839181] [81af64f3] ? iscsi_if_rx+0x23/0xa00
[ 2520.840232] [81053943] ? sched_clock+0x13/0x20
[ 2520.841242] [81af64f3] ? iscsi_if_rx+0x23/0xa00
[ 2520.842271] [82651430] mutex_lock_nested+0x40/0x50
[ 2520.843353] [81af64f3] iscsi_if_rx+0x23/0xa00
[ 2520.844461] [810dfffd] ? sub_preempt_count+0x9d/0xd0
[ 2520.845576] [82654130] ? _raw_read_unlock+0x30/0x60
[ 2520.846705] [8221632e] netlink_unicast+0x1ae/0x1f0
[ 2520.847790] [82216ae7] netlink_sendmsg+0x227/0x350
[ 2520.848884] [821a490d] ? sock_update_netprioidx+0xdd/0x1b0
[ 2520.850105] [821a4882] ? sock_update_netprioidx+0x52/0x1b0
[ 2520.851282] [8219e376] sock_aio_write+0x166/0x180
[ 2520.852317] [810dfe51] ? get_parent_ip+0x11/0x50
[ 2520.853342] [811d0b1a] do_sync_write+0xda/0x120
[ 2520.854347] [81109c42] ? lock_release_holdtime+0xb2/0x160
[ 2520.855533] [810dfe51] ? get_parent_ip+0x11/0x50
[ 2520.856569] [817914e7] ? security_file_permission+0x27/0xb0
[ 2520.857756] [811d0ccc] vfs_write+0x16c/0x180
[ 2520.858713] [811d0dcf] sys_write+0x4f/0xa0
[ 2520.859680] [826553f9] system_call_fastpath+0x16/0x1b
[ 2520.873039] 1 lock held by trinity/31986:
[ 2520.873801] #0: (rx_queue_mutex){+.+...}, at: [81af64f3]
iscsi_if_rx+0x23/0xa00
[ 2520.875587] Kernel panic - not syncing: hung_task: blocked tasks
From looking at the logs, there were two instances of the fuzzer blocked on
a write() to a netlink socket. There are no iSCSI targets anywhere on the
network.
What does the trinity test do? Does it write random junk to netlink
sockets to test the kernel handlers or were you actually stressing the
creation of targets. If the latter what driver were you trying to create
targets with (iscsi_tcp, bnx2i, etc)?
It basically just writes junk into sockets. In this case it was just a
large chunk of it written into the netlink socket.
I'm not directly trying to stress iscsi, though it might have happened
somehow during the test accidentally (but thats not probable).
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Re: [BUG] Hang (deadlock?) inside iscsi_if_rx
On 01/24/2012 10:51 AM, Sasha Levin wrote:
On Tue, Jan 24, 2012 at 11:29 AM, Mike Christie micha...@cs.wisc.edu wrote:
On 01/24/2012 08:30 AM, Sasha Levin wrote:
Hi all,
I got the following hang when running trinity under KVM tool:
[ 2520.824250] INFO: task trinity:31986 blocked for more than 120 seconds.
[ 2520.825513] echo 0 /proc/sys/kernel/hung_task_timeout_secs disables
this message.
[ 2520.826983] trinity D 5504 31986 2767
0x0004
[ 2520.828416] 88000a21ba98 0086 88000a3f8000
88000a3f8000
[ 2520.829892] 001d4340 88000a21bfd8 88000a21a000
001d4340
[ 2520.831380] 001d4340 001d4340 88000a21bfd8
001d4340
[ 2520.832838] Call Trace:
[ 2520.837089] [8265297a] schedule+0x3a/0x50
[ 2520.837983] [82651049] __mutex_lock_common+0x209/0x5b0
[ 2520.839181] [81af64f3] ? iscsi_if_rx+0x23/0xa00
[ 2520.840232] [81053943] ? sched_clock+0x13/0x20
[ 2520.841242] [81af64f3] ? iscsi_if_rx+0x23/0xa00
[ 2520.842271] [82651430] mutex_lock_nested+0x40/0x50
[ 2520.843353] [81af64f3] iscsi_if_rx+0x23/0xa00
[ 2520.844461] [810dfffd] ? sub_preempt_count+0x9d/0xd0
[ 2520.845576] [82654130] ? _raw_read_unlock+0x30/0x60
[ 2520.846705] [8221632e] netlink_unicast+0x1ae/0x1f0
[ 2520.847790] [82216ae7] netlink_sendmsg+0x227/0x350
[ 2520.848884] [821a490d] ? sock_update_netprioidx+0xdd/0x1b0
[ 2520.850105] [821a4882] ? sock_update_netprioidx+0x52/0x1b0
[ 2520.851282] [8219e376] sock_aio_write+0x166/0x180
[ 2520.852317] [810dfe51] ? get_parent_ip+0x11/0x50
[ 2520.853342] [811d0b1a] do_sync_write+0xda/0x120
[ 2520.854347] [81109c42] ? lock_release_holdtime+0xb2/0x160
[ 2520.855533] [810dfe51] ? get_parent_ip+0x11/0x50
[ 2520.856569] [817914e7] ? security_file_permission+0x27/0xb0
[ 2520.857756] [811d0ccc] vfs_write+0x16c/0x180
[ 2520.858713] [811d0dcf] sys_write+0x4f/0xa0
[ 2520.859680] [826553f9] system_call_fastpath+0x16/0x1b
[ 2520.873039] 1 lock held by trinity/31986:
[ 2520.873801] #0: (rx_queue_mutex){+.+...}, at: [81af64f3]
iscsi_if_rx+0x23/0xa00
[ 2520.875587] Kernel panic - not syncing: hung_task: blocked tasks
From looking at the logs, there were two instances of the fuzzer blocked on
a write() to a netlink socket. There are no iSCSI targets anywhere on the
network.
What does the trinity test do? Does it write random junk to netlink
sockets to test the kernel handlers or were you actually stressing the
creation of targets. If the latter what driver were you trying to create
targets with (iscsi_tcp, bnx2i, etc)?
It basically just writes junk into sockets. In this case it was just a
large chunk of it written into the netlink socket.
Could you tell me what arguments you used?
--
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Re: [BUG] Hang (deadlock?) inside iscsi_if_rx
On 01/25/2012 08:17 PM, Mike Christie wrote:
On 01/24/2012 10:51 AM, Sasha Levin wrote:
On Tue, Jan 24, 2012 at 11:29 AM, Mike Christie micha...@cs.wisc.edu wrote:
On 01/24/2012 08:30 AM, Sasha Levin wrote:
Hi all,
I got the following hang when running trinity under KVM tool:
[ 2520.824250] INFO: task trinity:31986 blocked for more than 120 seconds.
[ 2520.825513] echo 0 /proc/sys/kernel/hung_task_timeout_secs disables
this message.
[ 2520.826983] trinity D 5504 31986 2767
0x0004
[ 2520.828416] 88000a21ba98 0086 88000a3f8000
88000a3f8000
[ 2520.829892] 001d4340 88000a21bfd8 88000a21a000
001d4340
[ 2520.831380] 001d4340 001d4340 88000a21bfd8
001d4340
[ 2520.832838] Call Trace:
[ 2520.837089] [8265297a] schedule+0x3a/0x50
[ 2520.837983] [82651049] __mutex_lock_common+0x209/0x5b0
[ 2520.839181] [81af64f3] ? iscsi_if_rx+0x23/0xa00
[ 2520.840232] [81053943] ? sched_clock+0x13/0x20
[ 2520.841242] [81af64f3] ? iscsi_if_rx+0x23/0xa00
[ 2520.842271] [82651430] mutex_lock_nested+0x40/0x50
[ 2520.843353] [81af64f3] iscsi_if_rx+0x23/0xa00
[ 2520.844461] [810dfffd] ? sub_preempt_count+0x9d/0xd0
[ 2520.845576] [82654130] ? _raw_read_unlock+0x30/0x60
[ 2520.846705] [8221632e] netlink_unicast+0x1ae/0x1f0
[ 2520.847790] [82216ae7] netlink_sendmsg+0x227/0x350
[ 2520.848884] [821a490d] ? sock_update_netprioidx+0xdd/0x1b0
[ 2520.850105] [821a4882] ? sock_update_netprioidx+0x52/0x1b0
[ 2520.851282] [8219e376] sock_aio_write+0x166/0x180
[ 2520.852317] [810dfe51] ? get_parent_ip+0x11/0x50
[ 2520.853342] [811d0b1a] do_sync_write+0xda/0x120
[ 2520.854347] [81109c42] ? lock_release_holdtime+0xb2/0x160
[ 2520.855533] [810dfe51] ? get_parent_ip+0x11/0x50
[ 2520.856569] [817914e7] ? security_file_permission+0x27/0xb0
[ 2520.857756] [811d0ccc] vfs_write+0x16c/0x180
[ 2520.858713] [811d0dcf] sys_write+0x4f/0xa0
[ 2520.859680] [826553f9] system_call_fastpath+0x16/0x1b
[ 2520.873039] 1 lock held by trinity/31986:
[ 2520.873801] #0: (rx_queue_mutex){+.+...}, at: [81af64f3]
iscsi_if_rx+0x23/0xa00
[ 2520.875587] Kernel panic - not syncing: hung_task: blocked tasks
From looking at the logs, there were two instances of the fuzzer blocked
on a write() to a netlink socket. There are no iSCSI targets anywhere on
the network.
What does the trinity test do? Does it write random junk to netlink
sockets to test the kernel handlers or were you actually stressing the
creation of targets. If the latter what driver were you trying to create
targets with (iscsi_tcp, bnx2i, etc)?
It basically just writes junk into sockets. In this case it was just a
large chunk of it written into the netlink socket.
Could you tell me what arguments you used?
And what kernel was this with?
--
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Re: [BUG] Hang (deadlock?) inside iscsi_if_rx
On 01/24/2012 08:30 AM, Sasha Levin wrote:
Hi all,
I got the following hang when running trinity under KVM tool:
[ 2520.824250] INFO: task trinity:31986 blocked for more than 120 seconds.
[ 2520.825513] echo 0 /proc/sys/kernel/hung_task_timeout_secs disables
this message.
[ 2520.826983] trinity D 5504 31986 2767
0x0004
[ 2520.828416] 88000a21ba98 0086 88000a3f8000
88000a3f8000
[ 2520.829892] 001d4340 88000a21bfd8 88000a21a000
001d4340
[ 2520.831380] 001d4340 001d4340 88000a21bfd8
001d4340
[ 2520.832838] Call Trace:
[ 2520.837089] [8265297a] schedule+0x3a/0x50
[ 2520.837983] [82651049] __mutex_lock_common+0x209/0x5b0
[ 2520.839181] [81af64f3] ? iscsi_if_rx+0x23/0xa00
[ 2520.840232] [81053943] ? sched_clock+0x13/0x20
[ 2520.841242] [81af64f3] ? iscsi_if_rx+0x23/0xa00
[ 2520.842271] [82651430] mutex_lock_nested+0x40/0x50
[ 2520.843353] [81af64f3] iscsi_if_rx+0x23/0xa00
[ 2520.844461] [810dfffd] ? sub_preempt_count+0x9d/0xd0
[ 2520.845576] [82654130] ? _raw_read_unlock+0x30/0x60
[ 2520.846705] [8221632e] netlink_unicast+0x1ae/0x1f0
[ 2520.847790] [82216ae7] netlink_sendmsg+0x227/0x350
[ 2520.848884] [821a490d] ? sock_update_netprioidx+0xdd/0x1b0
[ 2520.850105] [821a4882] ? sock_update_netprioidx+0x52/0x1b0
[ 2520.851282] [8219e376] sock_aio_write+0x166/0x180
[ 2520.852317] [810dfe51] ? get_parent_ip+0x11/0x50
[ 2520.853342] [811d0b1a] do_sync_write+0xda/0x120
[ 2520.854347] [81109c42] ? lock_release_holdtime+0xb2/0x160
[ 2520.855533] [810dfe51] ? get_parent_ip+0x11/0x50
[ 2520.856569] [817914e7] ? security_file_permission+0x27/0xb0
[ 2520.857756] [811d0ccc] vfs_write+0x16c/0x180
[ 2520.858713] [811d0dcf] sys_write+0x4f/0xa0
[ 2520.859680] [826553f9] system_call_fastpath+0x16/0x1b
[ 2520.873039] 1 lock held by trinity/31986:
[ 2520.873801] #0: (rx_queue_mutex){+.+...}, at: [81af64f3]
iscsi_if_rx+0x23/0xa00
[ 2520.875587] Kernel panic - not syncing: hung_task: blocked tasks
From looking at the logs, there were two instances of the fuzzer blocked on a
write() to a netlink socket. There are no iSCSI targets anywhere on the
network.
What does the trinity test do? Does it write random junk to netlink
sockets to test the kernel handlers or were you actually stressing the
creation of targets. If the latter what driver were you trying to create
targets with (iscsi_tcp, bnx2i, etc)?
--
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Re: [BUG] Hang (deadlock?) inside iscsi_if_rx
On 01/24/2012 10:29 AM, Mike Christie wrote:
On 01/24/2012 08:30 AM, Sasha Levin wrote:
Hi all,
I got the following hang when running trinity under KVM tool:
[ 2520.824250] INFO: task trinity:31986 blocked for more than 120 seconds.
[ 2520.825513] echo 0 /proc/sys/kernel/hung_task_timeout_secs disables
this message.
[ 2520.826983] trinity D 5504 31986 2767
0x0004
[ 2520.828416] 88000a21ba98 0086 88000a3f8000
88000a3f8000
[ 2520.829892] 001d4340 88000a21bfd8 88000a21a000
001d4340
[ 2520.831380] 001d4340 001d4340 88000a21bfd8
001d4340
[ 2520.832838] Call Trace:
[ 2520.837089] [8265297a] schedule+0x3a/0x50
[ 2520.837983] [82651049] __mutex_lock_common+0x209/0x5b0
[ 2520.839181] [81af64f3] ? iscsi_if_rx+0x23/0xa00
[ 2520.840232] [81053943] ? sched_clock+0x13/0x20
[ 2520.841242] [81af64f3] ? iscsi_if_rx+0x23/0xa00
[ 2520.842271] [82651430] mutex_lock_nested+0x40/0x50
[ 2520.843353] [81af64f3] iscsi_if_rx+0x23/0xa00
[ 2520.844461] [810dfffd] ? sub_preempt_count+0x9d/0xd0
[ 2520.845576] [82654130] ? _raw_read_unlock+0x30/0x60
[ 2520.846705] [8221632e] netlink_unicast+0x1ae/0x1f0
[ 2520.847790] [82216ae7] netlink_sendmsg+0x227/0x350
[ 2520.848884] [821a490d] ? sock_update_netprioidx+0xdd/0x1b0
[ 2520.850105] [821a4882] ? sock_update_netprioidx+0x52/0x1b0
[ 2520.851282] [8219e376] sock_aio_write+0x166/0x180
[ 2520.852317] [810dfe51] ? get_parent_ip+0x11/0x50
[ 2520.853342] [811d0b1a] do_sync_write+0xda/0x120
[ 2520.854347] [81109c42] ? lock_release_holdtime+0xb2/0x160
[ 2520.855533] [810dfe51] ? get_parent_ip+0x11/0x50
[ 2520.856569] [817914e7] ? security_file_permission+0x27/0xb0
[ 2520.857756] [811d0ccc] vfs_write+0x16c/0x180
[ 2520.858713] [811d0dcf] sys_write+0x4f/0xa0
[ 2520.859680] [826553f9] system_call_fastpath+0x16/0x1b
[ 2520.873039] 1 lock held by trinity/31986:
[ 2520.873801] #0: (rx_queue_mutex){+.+...}, at: [81af64f3]
iscsi_if_rx+0x23/0xa00
[ 2520.875587] Kernel panic - not syncing: hung_task: blocked tasks
From looking at the logs, there were two instances of the fuzzer blocked on
a write() to a netlink socket. There are no iSCSI targets anywhere on the
network.
What does the trinity test do? Does it write random junk to netlink
sockets to test the kernel handlers or were you actually stressing the
creation of targets. If the latter what driver were you trying to create
targets with (iscsi_tcp, bnx2i, etc)?
Oh yeah, for the random type of test, how much data does userspace write?
--
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