Hi,
while running qemu 2.5 on a host running 4.4.6 the host system has
crashed (load > 200) 3 times in the last 3 days.
Always with this stack trace: (copy left here:
http://pastebin.com/raw/bCWTLKyt)
[69068.874268] divide error: 0000 [#1] SMP
[69068.875242] Modules linked in: ebtable_filter ebtables ip6t_REJECT
nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter
ip6_tables ipt_REJECT nf_reject_ipv4 xt_physdev xt_comment
nf_conntrack_ipv4 nf_defrag_ipv4 xt_tcpudp xt_mark xt_set xt_addrtype
xt_conntrack nf_conntrack ip_set_hash_net ip_set vhost_net tun vhost
macvtap macvlan kvm_intel nfnetlink_log kvm nfnetlink irqbypass
netconsole dlm xt_multiport iptable_filter ip_tables x_tables iscsi_tcp
libiscsi_tcp libiscsi scsi_transport_iscsi nfsd auth_rpcgss oid_registry
bonding coretemp 8021q garp fuse i2c_i801 i7core_edac edac_core
i5500_temp button btrfs xor raid6_pq dm_mod raid1 md_mod usb_storage
ohci_hcd bcache sg usbhid sd_mod ata_generic uhci_hcd ehci_pci ehci_hcd
usbcore ata_piix usb_common igb i2c_algo_bit mpt3sas raid_class ixgbe
scsi_transport_sas i2c_core mdio ptp pps_core
[69068.895604] CPU: 14 PID: 6673 Comm: ceph-osd Not tainted 4.4.6+7-ph #1
[69068.897052] Hardware name: Supermicro X8DT3/X8DT3, BIOS 2.1
03/17/2012
[69068.898578] task: ffff880fc7f28000 ti: ffff880fda2c4000 task.ti:
ffff880fda2c4000
[69068.900377] RIP: 0010:[<ffffffff860b372c>] [<ffffffff860b372c>]
task_h_load+0xcc/0x100
[69068.961763] RSP: 0000:ffff880fda2c7b50 EFLAGS: 00010257
[69069.023910] RAX: 0000000000000000 RBX: ffff880fda2c7c10 RCX:
0000000000000000
[69069.085953] RDX: 0000000000000000 RSI: 0000000000000001 RDI:
ffff880fc7f28000
[69069.151731] RBP: ffff880fda2c7bc8 R08: 00000001041955df R09:
ffff880fffd153f8
[69069.213757] R10: 0000000000000009 R11: 0000000000000193 R12:
ffff881f6832c780
[69069.274271] R13: ffff88203fc35380 R14: 0000000000000007 R15:
00000000000000b6
[69069.334727] FS: 00007f578a3fb700(0000) GS:ffff880fffd00000(0000)
knlGS:0000000000000000
[69069.396435] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[69069.458522] CR2: 00007f5784f18468 CR3: 0000001fe9738000 CR4:
00000000000026e0
[69069.520799] Stack:
[69069.581430] ffffffff860b6855 ffff880fda2c7b78 0000000000000000
0000000000000005
[69069.642629] ffff880fffd00000 0000000000000015 fffffffffffffe7d
0000000000000015
[69069.702815] 0000000000015380 ffff880fda2c7bc8 ffff880fc7f28000
00000000000001e9
[69069.761881] Call Trace:
[69069.819883] [<ffffffff860b6855>] ? task_numa_find_cpu+0x225/0x670
[69069.878368] [<ffffffff860b79f0>] task_numa_migrate+0x550/0x950
[69069.936059] [<ffffffff863d9138>] ? find_next_bit+0x18/0x20
[69069.993262] [<ffffffff860b7e6d>] numa_migrate_preferred+0x7d/0x90
[69070.050528] [<ffffffff860b89a5>] task_numa_fault+0x7c5/0xaa0
[69070.106544] [<ffffffff861a2c0b>] ? mpol_misplaced+0x16b/0x1b0
[69070.163705] [<ffffffff8618104e>] __handle_mm_fault+0x9ae/0x11f0
[69070.220013] [<ffffffff865e4c52>] ? inet_recvmsg+0x72/0x90
[69070.276558] [<ffffffff8655240b>] ? SYSC_recvfrom+0x12b/0x170
[69070.332283] [<ffffffff8618196f>] handle_mm_fault+0xdf/0x180
[69070.388515] [<ffffffff8604f324>] __do_page_fault+0x164/0x380
[69070.443897] [<ffffffff860b25c3>] ? account_user_time+0x73/0x80
[69070.498534] [<ffffffff860b2b3e>] ? vtime_account_user+0x4e/0x70
[69070.552598] [<ffffffff8604f5a7>] do_page_fault+0x37/0x90
[69070.605960] [<ffffffff86002a23>] ? syscall_return_slowpath+0x83/0xf0
[69070.660705] [<ffffffff866b32f8>] page_fault+0x28/0x30
[69070.715707] Code: 86 b8 00 00 00 48 89 86 b0 00 00 00 48 85 c9 75 ca
49 8b 81 b0 00 00 00 49 8b 49 78 31 d2 48 0f af 87 d8 01 00 00 5d 48 83
c1 01 <48> f7 f1 c3 4c 89 ce 48 8b 8e c0 00 00 00 48 8b 46 78 4c 89 86
[69070.835144] RIP [<ffffffff860b372c>] task_h_load+0xcc/0x100
[69070.894095] RSP <ffff880fda2c7b50>
[69070.953213] ---[ end trace 8d6f449a03dacfd4 ]---
Would be nice if we can fix this in 4.4?
Greets,
Stefan
On Thu, Mar 17, 2016 at 07:38:03PM +0100, Stefan Priebe wrote:
> Hi,
>
> while running qemu 2.5 on a host running 4.4.6 the host system has crashed
> (load > 200) 3 times in the last 3 days.
>
> Always with this stack trace: (copy left here:
> http://pastebin.com/raw/bCWTLKyt)
>
> [69068.874268] divide error: 0000 [#1] SMP
> [69068.875242] Modules linked in: ebtable_filter ebtables ip6t_REJECT
> nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables
> ipt_REJECT nf_reject_ipv4 xt_physdev xt_comment nf_conntrack_ipv4
> nf_defrag_ipv4 xt_tcpudp xt_mark xt_set xt_addrtype xt_conntrack
> nf_conntrack ip_set_hash_net ip_set vhost_net tun vhost macvtap macvlan
> kvm_intel nfnetlink_log kvm nfnetlink irqbypass netconsole dlm xt_multiport
> iptable_filter ip_tables x_tables iscsi_tcp libiscsi_tcp libiscsi
> scsi_transport_iscsi nfsd auth_rpcgss oid_registry bonding coretemp 8021q
> garp fuse i2c_i801 i7core_edac edac_core i5500_temp button btrfs xor
> raid6_pq dm_mod raid1 md_mod usb_storage ohci_hcd bcache sg usbhid sd_mod
> ata_generic uhci_hcd ehci_pci ehci_hcd usbcore ata_piix usb_common igb
> i2c_algo_bit mpt3sas raid_class ixgbe scsi_transport_sas i2c_core mdio ptp
> pps_core
> [69068.895604] CPU: 14 PID: 6673 Comm: ceph-osd Not tainted 4.4.6+7-ph #1
> [69068.897052] Hardware name: Supermicro X8DT3/X8DT3, BIOS 2.1 03/17/2012
> [69068.898578] task: ffff880fc7f28000 ti: ffff880fda2c4000 task.ti:
> ffff880fda2c4000
> [69068.900377] RIP: 0010:[<ffffffff860b372c>] [<ffffffff860b372c>]
> task_h_load+0xcc/0x100
> [69068.961763] RSP: 0000:ffff880fda2c7b50 EFLAGS: 00010257
> [69069.023910] RAX: 0000000000000000 RBX: ffff880fda2c7c10 RCX:
> 0000000000000000
> [69069.085953] RDX: 0000000000000000 RSI: 0000000000000001 RDI:
> ffff880fc7f28000
> [69069.151731] RBP: ffff880fda2c7bc8 R08: 00000001041955df R09:
> ffff880fffd153f8
> [69069.213757] R10: 0000000000000009 R11: 0000000000000193 R12:
> ffff881f6832c780
> [69069.274271] R13: ffff88203fc35380 R14: 0000000000000007 R15:
> 00000000000000b6
> [69069.334727] FS: 00007f578a3fb700(0000) GS:ffff880fffd00000(0000)
> knlGS:0000000000000000
> [69069.396435] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [69069.458522] CR2: 00007f5784f18468 CR3: 0000001fe9738000 CR4:
> 00000000000026e0
> [69069.520799] Stack:
> [69069.581430] ffffffff860b6855 ffff880fda2c7b78 0000000000000000
> 0000000000000005
> [69069.642629] ffff880fffd00000 0000000000000015 fffffffffffffe7d
> 0000000000000015
> [69069.702815] 0000000000015380 ffff880fda2c7bc8 ffff880fc7f28000
> 00000000000001e9
> [69069.761881] Call Trace:
> [69069.819883] [<ffffffff860b6855>] ? task_numa_find_cpu+0x225/0x670
> [69069.878368] [<ffffffff860b79f0>] task_numa_migrate+0x550/0x950
> [69069.936059] [<ffffffff863d9138>] ? find_next_bit+0x18/0x20
> [69069.993262] [<ffffffff860b7e6d>] numa_migrate_preferred+0x7d/0x90
> [69070.050528] [<ffffffff860b89a5>] task_numa_fault+0x7c5/0xaa0
> [69070.106544] [<ffffffff861a2c0b>] ? mpol_misplaced+0x16b/0x1b0
> [69070.163705] [<ffffffff8618104e>] __handle_mm_fault+0x9ae/0x11f0
> [69070.220013] [<ffffffff865e4c52>] ? inet_recvmsg+0x72/0x90
> [69070.276558] [<ffffffff8655240b>] ? SYSC_recvfrom+0x12b/0x170
> [69070.332283] [<ffffffff8618196f>] handle_mm_fault+0xdf/0x180
> [69070.388515] [<ffffffff8604f324>] __do_page_fault+0x164/0x380
> [69070.443897] [<ffffffff860b25c3>] ? account_user_time+0x73/0x80
> [69070.498534] [<ffffffff860b2b3e>] ? vtime_account_user+0x4e/0x70
> [69070.552598] [<ffffffff8604f5a7>] do_page_fault+0x37/0x90
> [69070.605960] [<ffffffff86002a23>] ? syscall_return_slowpath+0x83/0xf0
> [69070.660705] [<ffffffff866b32f8>] page_fault+0x28/0x30
> [69070.715707] Code: 86 b8 00 00 00 48 89 86 b0 00 00 00 48 85 c9 75 ca 49
> 8b 81 b0 00 00 00 49 8b 49 78 31 d2 48 0f af 87 d8 01 00 00 5d 48 83 c1 01
> <48> f7 f1 c3 4c 89 ce 48 8b 8e c0 00 00 00 48 8b 46 78 4c 89 86
> [69070.835144] RIP [<ffffffff860b372c>] task_h_load+0xcc/0x100
> [69070.894095] RSP <ffff880fda2c7b50>
> [69070.953213] ---[ end trace 8d6f449a03dacfd4 ]---
>
> Would be nice if we can fix this in 4.4?
Does this also happen in 4.5? Did this work on 4.4.5? Some previous
release? If you can find the offending patch using 'git bisect', that
would be great.
thanks,
greg k-h
On 03/17/2016 07:45 PM, Greg KH wrote:
> On Thu, Mar 17, 2016 at 07:38:03PM +0100, Stefan Priebe wrote:
>> Hi,
>>
>> while running qemu 2.5 on a host running 4.4.6 the host system has crashed
>> (load > 200) 3 times in the last 3 days.
>>
>> Always with this stack trace: (copy left here:
>> http://pastebin.com/raw/bCWTLKyt)
>>
>> [69068.874268] divide error: 0000 [#1] SMP
>> [69068.875242] Modules linked in: ebtable_filter ebtables ip6t_REJECT
>> nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables
>> ipt_REJECT nf_reject_ipv4 xt_physdev xt_comment nf_conntrack_ipv4
>> nf_defrag_ipv4 xt_tcpudp xt_mark xt_set xt_addrtype xt_conntrack
>> nf_conntrack ip_set_hash_net ip_set vhost_net tun vhost macvtap macvlan
>> kvm_intel nfnetlink_log kvm nfnetlink irqbypass netconsole dlm xt_multiport
>> iptable_filter ip_tables x_tables iscsi_tcp libiscsi_tcp libiscsi
>> scsi_transport_iscsi nfsd auth_rpcgss oid_registry bonding coretemp 8021q
>> garp fuse i2c_i801 i7core_edac edac_core i5500_temp button btrfs xor
>> raid6_pq dm_mod raid1 md_mod usb_storage ohci_hcd bcache sg usbhid sd_mod
>> ata_generic uhci_hcd ehci_pci ehci_hcd usbcore ata_piix usb_common igb
>> i2c_algo_bit mpt3sas raid_class ixgbe scsi_transport_sas i2c_core mdio ptp
>> pps_core
>> [69068.895604] CPU: 14 PID: 6673 Comm: ceph-osd Not tainted 4.4.6+7-ph #1
>> [69068.897052] Hardware name: Supermicro X8DT3/X8DT3, BIOS 2.1 03/17/2012
>> [69068.898578] task: ffff880fc7f28000 ti: ffff880fda2c4000 task.ti:
>> ffff880fda2c4000
>> [69068.900377] RIP: 0010:[<ffffffff860b372c>] [<ffffffff860b372c>]
>> task_h_load+0xcc/0x100
decodecode says:
27: 48 83 c1 01 add $0x1,%rcx
2b:* 48 f7 f1 div %rcx <-- trapping instruction
This suggests the CONFIG_FAIR_GROUP_SCHED version of task_h_load:
update_cfs_rq_h_load(cfs_rq);
return div64_ul(p->se.avg.load_avg * cfs_rq->h_load,
cfs_rq_load_avg(cfs_rq) + 1);
So the load avg is -1, thus after adding 1 we get division by 0, huh?
>> [69068.961763] RSP: 0000:ffff880fda2c7b50 EFLAGS: 00010257
>> [69069.023910] RAX: 0000000000000000 RBX: ffff880fda2c7c10 RCX:
>> 0000000000000000
>> [69069.085953] RDX: 0000000000000000 RSI: 0000000000000001 RDI:
>> ffff880fc7f28000
>> [69069.151731] RBP: ffff880fda2c7bc8 R08: 00000001041955df R09:
>> ffff880fffd153f8
>> [69069.213757] R10: 0000000000000009 R11: 0000000000000193 R12:
>> ffff881f6832c780
>> [69069.274271] R13: ffff88203fc35380 R14: 0000000000000007 R15:
>> 00000000000000b6
>> [69069.334727] FS: 00007f578a3fb700(0000) GS:ffff880fffd00000(0000)
>> knlGS:0000000000000000
>> [69069.396435] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [69069.458522] CR2: 00007f5784f18468 CR3: 0000001fe9738000 CR4:
>> 00000000000026e0
>> [69069.520799] Stack:
>> [69069.581430] ffffffff860b6855 ffff880fda2c7b78 0000000000000000
>> 0000000000000005
>> [69069.642629] ffff880fffd00000 0000000000000015 fffffffffffffe7d
>> 0000000000000015
>> [69069.702815] 0000000000015380 ffff880fda2c7bc8 ffff880fc7f28000
>> 00000000000001e9
>> [69069.761881] Call Trace:
>> [69069.819883] [<ffffffff860b6855>] ? task_numa_find_cpu+0x225/0x670
>> [69069.878368] [<ffffffff860b79f0>] task_numa_migrate+0x550/0x950
>> [69069.936059] [<ffffffff863d9138>] ? find_next_bit+0x18/0x20
>> [69069.993262] [<ffffffff860b7e6d>] numa_migrate_preferred+0x7d/0x90
>> [69070.050528] [<ffffffff860b89a5>] task_numa_fault+0x7c5/0xaa0
>> [69070.106544] [<ffffffff861a2c0b>] ? mpol_misplaced+0x16b/0x1b0
>> [69070.163705] [<ffffffff8618104e>] __handle_mm_fault+0x9ae/0x11f0
>> [69070.220013] [<ffffffff865e4c52>] ? inet_recvmsg+0x72/0x90
>> [69070.276558] [<ffffffff8655240b>] ? SYSC_recvfrom+0x12b/0x170
>> [69070.332283] [<ffffffff8618196f>] handle_mm_fault+0xdf/0x180
>> [69070.388515] [<ffffffff8604f324>] __do_page_fault+0x164/0x380
>> [69070.443897] [<ffffffff860b25c3>] ? account_user_time+0x73/0x80
>> [69070.498534] [<ffffffff860b2b3e>] ? vtime_account_user+0x4e/0x70
>> [69070.552598] [<ffffffff8604f5a7>] do_page_fault+0x37/0x90
>> [69070.605960] [<ffffffff86002a23>] ? syscall_return_slowpath+0x83/0xf0
>> [69070.660705] [<ffffffff866b32f8>] page_fault+0x28/0x30
>> [69070.715707] Code: 86 b8 00 00 00 48 89 86 b0 00 00 00 48 85 c9 75 ca 49
>> 8b 81 b0 00 00 00 49 8b 49 78 31 d2 48 0f af 87 d8 01 00 00 5d 48 83 c1 01
>> <48> f7 f1 c3 4c 89 ce 48 8b 8e c0 00 00 00 48 8b 46 78 4c 89 86
>> [69070.835144] RIP [<ffffffff860b372c>] task_h_load+0xcc/0x100
>> [69070.894095] RSP <ffff880fda2c7b50>
>> [69070.953213] ---[ end trace 8d6f449a03dacfd4 ]---
>>
>> Would be nice if we can fix this in 4.4?
>
> Does this also happen in 4.5? Did this work on 4.4.5? Some previous
> release? If you can find the offending patch using 'git bisect', that
> would be great.
>
> thanks,
>
> greg k-h
>
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to [email protected]. For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"[email protected]"> [email protected] </a>
>
Am 19.03.2016 um 23:26 schrieb Vlastimil Babka:
> On 03/17/2016 07:45 PM, Greg KH wrote:
>> On Thu, Mar 17, 2016 at 07:38:03PM +0100, Stefan Priebe wrote:
>>> Hi,
>>>
>>> while running qemu 2.5 on a host running 4.4.6 the host system has
>>> crashed
>>> (load > 200) 3 times in the last 3 days.
>>>
>>> Always with this stack trace: (copy left here:
>>> http://pastebin.com/raw/bCWTLKyt)
>>>
>>> [69068.874268] divide error: 0000 [#1] SMP
>>> [69068.875242] Modules linked in: ebtable_filter ebtables ip6t_REJECT
>>> nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter
>>> ip6_tables
>>> ipt_REJECT nf_reject_ipv4 xt_physdev xt_comment nf_conntrack_ipv4
>>> nf_defrag_ipv4 xt_tcpudp xt_mark xt_set xt_addrtype xt_conntrack
>>> nf_conntrack ip_set_hash_net ip_set vhost_net tun vhost macvtap macvlan
>>> kvm_intel nfnetlink_log kvm nfnetlink irqbypass netconsole dlm
>>> xt_multiport
>>> iptable_filter ip_tables x_tables iscsi_tcp libiscsi_tcp libiscsi
>>> scsi_transport_iscsi nfsd auth_rpcgss oid_registry bonding coretemp
>>> 8021q
>>> garp fuse i2c_i801 i7core_edac edac_core i5500_temp button btrfs xor
>>> raid6_pq dm_mod raid1 md_mod usb_storage ohci_hcd bcache sg usbhid
>>> sd_mod
>>> ata_generic uhci_hcd ehci_pci ehci_hcd usbcore ata_piix usb_common igb
>>> i2c_algo_bit mpt3sas raid_class ixgbe scsi_transport_sas i2c_core
>>> mdio ptp
>>> pps_core
>>> [69068.895604] CPU: 14 PID: 6673 Comm: ceph-osd Not tainted
>>> 4.4.6+7-ph #1
>>> [69068.897052] Hardware name: Supermicro X8DT3/X8DT3, BIOS 2.1
>>> 03/17/2012
>>> [69068.898578] task: ffff880fc7f28000 ti: ffff880fda2c4000 task.ti:
>>> ffff880fda2c4000
>>> [69068.900377] RIP: 0010:[<ffffffff860b372c>] [<ffffffff860b372c>]
>>> task_h_load+0xcc/0x100
>
> decodecode says:
>
> 27: 48 83 c1 01 add $0x1,%rcx
> 2b:* 48 f7 f1 div %rcx <-- trapping
> instruction
>
> This suggests the CONFIG_FAIR_GROUP_SCHED version of task_h_load:
>
> update_cfs_rq_h_load(cfs_rq);
> return div64_ul(p->se.avg.load_avg * cfs_rq->h_load,
> cfs_rq_load_avg(cfs_rq) + 1);
>
> So the load avg is -1, thus after adding 1 we get division by 0, huh?
Yes CONFIG_FAIR_GROUP_SCHED is set. I cherry picked now all those
commits up to 4.5 for fair.c:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/kernel/sched/fair.c?h=v4.5
It didn't happen again with v4.4.6 + 4.5 patches for fair.c
Greets,
Stefan
>
>>> [69068.961763] RSP: 0000:ffff880fda2c7b50 EFLAGS: 00010257
>>> [69069.023910] RAX: 0000000000000000 RBX: ffff880fda2c7c10 RCX:
>>> 0000000000000000
>>> [69069.085953] RDX: 0000000000000000 RSI: 0000000000000001 RDI:
>>> ffff880fc7f28000
>>> [69069.151731] RBP: ffff880fda2c7bc8 R08: 00000001041955df R09:
>>> ffff880fffd153f8
>>> [69069.213757] R10: 0000000000000009 R11: 0000000000000193 R12:
>>> ffff881f6832c780
>>> [69069.274271] R13: ffff88203fc35380 R14: 0000000000000007 R15:
>>> 00000000000000b6
>>> [69069.334727] FS: 00007f578a3fb700(0000) GS:ffff880fffd00000(0000)
>>> knlGS:0000000000000000
>>> [69069.396435] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> [69069.458522] CR2: 00007f5784f18468 CR3: 0000001fe9738000 CR4:
>>> 00000000000026e0
>>> [69069.520799] Stack:
>>> [69069.581430] ffffffff860b6855 ffff880fda2c7b78 0000000000000000
>>> 0000000000000005
>>> [69069.642629] ffff880fffd00000 0000000000000015 fffffffffffffe7d
>>> 0000000000000015
>>> [69069.702815] 0000000000015380 ffff880fda2c7bc8 ffff880fc7f28000
>>> 00000000000001e9
>>> [69069.761881] Call Trace:
>>> [69069.819883] [<ffffffff860b6855>] ? task_numa_find_cpu+0x225/0x670
>>> [69069.878368] [<ffffffff860b79f0>] task_numa_migrate+0x550/0x950
>>> [69069.936059] [<ffffffff863d9138>] ? find_next_bit+0x18/0x20
>>> [69069.993262] [<ffffffff860b7e6d>] numa_migrate_preferred+0x7d/0x90
>>> [69070.050528] [<ffffffff860b89a5>] task_numa_fault+0x7c5/0xaa0
>>> [69070.106544] [<ffffffff861a2c0b>] ? mpol_misplaced+0x16b/0x1b0
>>> [69070.163705] [<ffffffff8618104e>] __handle_mm_fault+0x9ae/0x11f0
>>> [69070.220013] [<ffffffff865e4c52>] ? inet_recvmsg+0x72/0x90
>>> [69070.276558] [<ffffffff8655240b>] ? SYSC_recvfrom+0x12b/0x170
>>> [69070.332283] [<ffffffff8618196f>] handle_mm_fault+0xdf/0x180
>>> [69070.388515] [<ffffffff8604f324>] __do_page_fault+0x164/0x380
>>> [69070.443897] [<ffffffff860b25c3>] ? account_user_time+0x73/0x80
>>> [69070.498534] [<ffffffff860b2b3e>] ? vtime_account_user+0x4e/0x70
>>> [69070.552598] [<ffffffff8604f5a7>] do_page_fault+0x37/0x90
>>> [69070.605960] [<ffffffff86002a23>] ? syscall_return_slowpath+0x83/0xf0
>>> [69070.660705] [<ffffffff866b32f8>] page_fault+0x28/0x30
>>> [69070.715707] Code: 86 b8 00 00 00 48 89 86 b0 00 00 00 48 85 c9 75
>>> ca 49
>>> 8b 81 b0 00 00 00 49 8b 49 78 31 d2 48 0f af 87 d8 01 00 00 5d 48 83
>>> c1 01
>>> <48> f7 f1 c3 4c 89 ce 48 8b 8e c0 00 00 00 48 8b 46 78 4c 89 86
>>> [69070.835144] RIP [<ffffffff860b372c>] task_h_load+0xcc/0x100
>>> [69070.894095] RSP <ffff880fda2c7b50>
>>> [69070.953213] ---[ end trace 8d6f449a03dacfd4 ]---
>>>
>>> Would be nice if we can fix this in 4.4?
>>
>> Does this also happen in 4.5? Did this work on 4.4.5? Some previous
>> release? If you can find the offending patch using 'git bisect', that
>> would be great.
>>
>> thanks,
>>
>> greg k-h
>>
>> --
>> To unsubscribe, send a message with 'unsubscribe linux-mm' in
>> the body to [email protected]. For more info on Linux MM,
>> see: http://www.linux-mm.org/ .
>> Don't email: <a href=mailto:"[email protected]"> [email protected] </a>
>>
>
On Sun, Mar 20, 2016 at 10:27:23PM +0100, Stefan Priebe wrote:
>
> Am 19.03.2016 um 23:26 schrieb Vlastimil Babka:
> >On 03/17/2016 07:45 PM, Greg KH wrote:
> >>On Thu, Mar 17, 2016 at 07:38:03PM +0100, Stefan Priebe wrote:
> >>>Hi,
> >>>
> >>>while running qemu 2.5 on a host running 4.4.6 the host system has
> >>>crashed
> >>>(load > 200) 3 times in the last 3 days.
> >>>
> >>>Always with this stack trace: (copy left here:
> >>>http://pastebin.com/raw/bCWTLKyt)
> >>>
> >>>[69068.874268] divide error: 0000 [#1] SMP
> >>>[69068.875242] Modules linked in: ebtable_filter ebtables ip6t_REJECT
> >>>nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter
> >>>ip6_tables
> >>>ipt_REJECT nf_reject_ipv4 xt_physdev xt_comment nf_conntrack_ipv4
> >>>nf_defrag_ipv4 xt_tcpudp xt_mark xt_set xt_addrtype xt_conntrack
> >>>nf_conntrack ip_set_hash_net ip_set vhost_net tun vhost macvtap macvlan
> >>>kvm_intel nfnetlink_log kvm nfnetlink irqbypass netconsole dlm
> >>>xt_multiport
> >>>iptable_filter ip_tables x_tables iscsi_tcp libiscsi_tcp libiscsi
> >>>scsi_transport_iscsi nfsd auth_rpcgss oid_registry bonding coretemp
> >>>8021q
> >>>garp fuse i2c_i801 i7core_edac edac_core i5500_temp button btrfs xor
> >>>raid6_pq dm_mod raid1 md_mod usb_storage ohci_hcd bcache sg usbhid
> >>>sd_mod
> >>>ata_generic uhci_hcd ehci_pci ehci_hcd usbcore ata_piix usb_common igb
> >>>i2c_algo_bit mpt3sas raid_class ixgbe scsi_transport_sas i2c_core
> >>>mdio ptp
> >>>pps_core
> >>>[69068.895604] CPU: 14 PID: 6673 Comm: ceph-osd Not tainted
> >>>4.4.6+7-ph #1
> >>>[69068.897052] Hardware name: Supermicro X8DT3/X8DT3, BIOS 2.1
> >>>03/17/2012
> >>>[69068.898578] task: ffff880fc7f28000 ti: ffff880fda2c4000 task.ti:
> >>>ffff880fda2c4000
> >>>[69068.900377] RIP: 0010:[<ffffffff860b372c>] [<ffffffff860b372c>]
> >>>task_h_load+0xcc/0x100
> >
> >decodecode says:
> >
> > 27: 48 83 c1 01 add $0x1,%rcx
> > 2b:* 48 f7 f1 div %rcx <-- trapping
> >instruction
> >
> >This suggests the CONFIG_FAIR_GROUP_SCHED version of task_h_load:
> >
> > update_cfs_rq_h_load(cfs_rq);
> > return div64_ul(p->se.avg.load_avg * cfs_rq->h_load,
> > cfs_rq_load_avg(cfs_rq) + 1);
> >
> >So the load avg is -1, thus after adding 1 we get division by 0, huh?
>
> Yes CONFIG_FAIR_GROUP_SCHED is set. I cherry picked now all those commits up
> to 4.5 for fair.c:
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/kernel/sched/fair.c?h=v4.5
>
> It didn't happen again with v4.4.6 + 4.5 patches for fair.c
Ok, that's a lot of patches, how about figuring out which single patch,
or shortest number of patches, makes things work again?
thanks,
greg k-h
Am 20.03.2016 um 22:41 schrieb Greg KH:
> On Sun, Mar 20, 2016 at 10:27:23PM +0100, Stefan Priebe wrote:
>>
>> Am 19.03.2016 um 23:26 schrieb Vlastimil Babka:
>>> On 03/17/2016 07:45 PM, Greg KH wrote:
>>>> On Thu, Mar 17, 2016 at 07:38:03PM +0100, Stefan Priebe wrote:
>>>>> Hi,
>>>>>
>>>>> while running qemu 2.5 on a host running 4.4.6 the host system has
>>>>> crashed
>>>>> (load > 200) 3 times in the last 3 days.
>>>>>
>>>>> Always with this stack trace: (copy left here:
>>>>> http://pastebin.com/raw/bCWTLKyt)
>>>>>
>>>>> [69068.874268] divide error: 0000 [#1] SMP
>>>>> [69068.875242] Modules linked in: ebtable_filter ebtables ip6t_REJECT
>>>>> nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter
>>>>> ip6_tables
>>>>> ipt_REJECT nf_reject_ipv4 xt_physdev xt_comment nf_conntrack_ipv4
>>>>> nf_defrag_ipv4 xt_tcpudp xt_mark xt_set xt_addrtype xt_conntrack
>>>>> nf_conntrack ip_set_hash_net ip_set vhost_net tun vhost macvtap macvlan
>>>>> kvm_intel nfnetlink_log kvm nfnetlink irqbypass netconsole dlm
>>>>> xt_multiport
>>>>> iptable_filter ip_tables x_tables iscsi_tcp libiscsi_tcp libiscsi
>>>>> scsi_transport_iscsi nfsd auth_rpcgss oid_registry bonding coretemp
>>>>> 8021q
>>>>> garp fuse i2c_i801 i7core_edac edac_core i5500_temp button btrfs xor
>>>>> raid6_pq dm_mod raid1 md_mod usb_storage ohci_hcd bcache sg usbhid
>>>>> sd_mod
>>>>> ata_generic uhci_hcd ehci_pci ehci_hcd usbcore ata_piix usb_common igb
>>>>> i2c_algo_bit mpt3sas raid_class ixgbe scsi_transport_sas i2c_core
>>>>> mdio ptp
>>>>> pps_core
>>>>> [69068.895604] CPU: 14 PID: 6673 Comm: ceph-osd Not tainted
>>>>> 4.4.6+7-ph #1
>>>>> [69068.897052] Hardware name: Supermicro X8DT3/X8DT3, BIOS 2.1
>>>>> 03/17/2012
>>>>> [69068.898578] task: ffff880fc7f28000 ti: ffff880fda2c4000 task.ti:
>>>>> ffff880fda2c4000
>>>>> [69068.900377] RIP: 0010:[<ffffffff860b372c>] [<ffffffff860b372c>]
>>>>> task_h_load+0xcc/0x100
>>>
>>> decodecode says:
>>>
>>> 27: 48 83 c1 01 add $0x1,%rcx
>>> 2b:* 48 f7 f1 div %rcx <-- trapping
>>> instruction
>>>
>>> This suggests the CONFIG_FAIR_GROUP_SCHED version of task_h_load:
>>>
>>> update_cfs_rq_h_load(cfs_rq);
>>> return div64_ul(p->se.avg.load_avg * cfs_rq->h_load,
>>> cfs_rq_load_avg(cfs_rq) + 1);
>>>
>>> So the load avg is -1, thus after adding 1 we get division by 0, huh?
>>
>> Yes CONFIG_FAIR_GROUP_SCHED is set. I cherry picked now all those commits up
>> to 4.5 for fair.c:
>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/kernel/sched/fair.c?h=v4.5
>>
>> It didn't happen again with v4.4.6 + 4.5 patches for fair.c
>
> Ok, that's a lot of patches, how about figuring out which single patch,
> or shortest number of patches, makes things work again?
will do so but it seems most out of those 9 patches are based on each
other. So it wouldn't be easy.
Stefan
>
> thanks,
>
> greg k-h
>
On Mon, Mar 21, 2016 at 11:52:23AM +0100, Stefan Priebe - Profihost AG wrote:
>
> Am 20.03.2016 um 22:41 schrieb Greg KH:
> > On Sun, Mar 20, 2016 at 10:27:23PM +0100, Stefan Priebe wrote:
> >>
> >> Am 19.03.2016 um 23:26 schrieb Vlastimil Babka:
> >>> On 03/17/2016 07:45 PM, Greg KH wrote:
> >>>> On Thu, Mar 17, 2016 at 07:38:03PM +0100, Stefan Priebe wrote:
> >>>>> Hi,
> >>>>>
> >>>>> while running qemu 2.5 on a host running 4.4.6 the host system has
> >>>>> crashed
> >>>>> (load > 200) 3 times in the last 3 days.
> >>>>>
> >>>>> Always with this stack trace: (copy left here:
> >>>>> http://pastebin.com/raw/bCWTLKyt)
> >>>>>
> >>>>> [69068.874268] divide error: 0000 [#1] SMP
> >>>>> [69068.875242] Modules linked in: ebtable_filter ebtables ip6t_REJECT
> >>>>> nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter
> >>>>> ip6_tables
> >>>>> ipt_REJECT nf_reject_ipv4 xt_physdev xt_comment nf_conntrack_ipv4
> >>>>> nf_defrag_ipv4 xt_tcpudp xt_mark xt_set xt_addrtype xt_conntrack
> >>>>> nf_conntrack ip_set_hash_net ip_set vhost_net tun vhost macvtap macvlan
> >>>>> kvm_intel nfnetlink_log kvm nfnetlink irqbypass netconsole dlm
> >>>>> xt_multiport
> >>>>> iptable_filter ip_tables x_tables iscsi_tcp libiscsi_tcp libiscsi
> >>>>> scsi_transport_iscsi nfsd auth_rpcgss oid_registry bonding coretemp
> >>>>> 8021q
> >>>>> garp fuse i2c_i801 i7core_edac edac_core i5500_temp button btrfs xor
> >>>>> raid6_pq dm_mod raid1 md_mod usb_storage ohci_hcd bcache sg usbhid
> >>>>> sd_mod
> >>>>> ata_generic uhci_hcd ehci_pci ehci_hcd usbcore ata_piix usb_common igb
> >>>>> i2c_algo_bit mpt3sas raid_class ixgbe scsi_transport_sas i2c_core
> >>>>> mdio ptp
> >>>>> pps_core
> >>>>> [69068.895604] CPU: 14 PID: 6673 Comm: ceph-osd Not tainted
> >>>>> 4.4.6+7-ph #1
> >>>>> [69068.897052] Hardware name: Supermicro X8DT3/X8DT3, BIOS 2.1
> >>>>> 03/17/2012
> >>>>> [69068.898578] task: ffff880fc7f28000 ti: ffff880fda2c4000 task.ti:
> >>>>> ffff880fda2c4000
> >>>>> [69068.900377] RIP: 0010:[<ffffffff860b372c>] [<ffffffff860b372c>]
> >>>>> task_h_load+0xcc/0x100
> >>>
> >>> decodecode says:
> >>>
> >>> 27: 48 83 c1 01 add $0x1,%rcx
> >>> 2b:* 48 f7 f1 div %rcx <-- trapping
> >>> instruction
> >>>
> >>> This suggests the CONFIG_FAIR_GROUP_SCHED version of task_h_load:
> >>>
> >>> update_cfs_rq_h_load(cfs_rq);
> >>> return div64_ul(p->se.avg.load_avg * cfs_rq->h_load,
> >>> cfs_rq_load_avg(cfs_rq) + 1);
> >>>
> >>> So the load avg is -1, thus after adding 1 we get division by 0, huh?
> >>
> >> Yes CONFIG_FAIR_GROUP_SCHED is set. I cherry picked now all those commits up
> >> to 4.5 for fair.c:
> >> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/kernel/sched/fair.c?h=v4.5
> >>
> >> It didn't happen again with v4.4.6 + 4.5 patches for fair.c
> >
> > Ok, that's a lot of patches, how about figuring out which single patch,
> > or shortest number of patches, makes things work again?
>
> will do so but it seems most out of those 9 patches are based on each
> other. So it wouldn't be easy.
Worst case, we take all 9. Best case, we only need one :)
thanks,
greg k-h