[Kernel-packages] [Bug 1702998] Comment bridged from LTC Bugzilla

2017-09-11 Thread bugproxy 
--- Comment From bren...@br.ibm.com 2017-09-11 14:23 EDT---
Lata, Chandan,

Canonical created a special kernel with this fix. They need us to test
it before integrating the patch in the kernel. Could you please test it
and let them know the result of this one-off kernel?

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Title:
  Ubuntu 17.04: Guest crashed @writeback_sb_inodes+0x310/0x590

Status in The Ubuntu-power-systems project:
  Incomplete
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Zesty:
  In Progress

Bug description:
  == Comment: #0 - Lata Kuntal  - 2017-03-03 00:50:54 ==
  Ubuntu 17.04 guest dropped at xmon after crashing at 
writeback_sb_inodes+0x310/0x590. 
  The guest is having XFS rootfs and NPIV disk. It crashed after 30+ hrs of 
BASE and NFS stress test .

  Crash logs
  ===
  root@guskvm:~# virsh console gusg1 --force
  Connected to domain gusg1
  Escape character is ^]

  0:mon>
  0:mon> t
  [c000a4bc7940] c036f790 writeback_sb_inodes+0x310/0x590
  [c000a4bc7a50] c036faf4 __writeback_inodes_wb+0xe4/0x150
  [c000a4bc7ab0] c036ff1c wb_writeback+0x2cc/0x440
  [c000a4bc7b80] c0370c30 wb_workfn+0x150/0x560
  [c000a4bc7c90] c00ed8c0 process_one_work+0x2b0/0x5a0
  [c000a4bc7d20] c00edc58 worker_thread+0xa8/0x650
  [c000a4bc7dc0] c00f67b4 kthread+0x154/0x1a0
  [c000a4bc7e30] c000b4e8 ret_from_kernel_thread+0x5c/0x74
  0:mon> r
  R00 = c036f790   R16 = c000eca70300
  R01 = c000a4bc78e0   R17 = c000f7035240
  R02 = c143c900   R18 = 
  R03 = c000f7035150   R19 = 
  R04 = 0019   R20 = c000a4bc4000
  R05 = 0100   R21 = ff7f
  R06 =    R22 = c433d758
  R07 =    R23 = c433d738
  R08 = 00034995   R24 = 
  R09 =    R25 = 
  R10 = 8000   R26 = c000f70351d8
  R11 = c000a4bc7a40   R27 = 
  R12 = 2200   R28 = 0001
  R13 = cfb8   R29 = c433d728
  R14 =    R30 = c000f7035150
  R15 = c000f70351d8   R31 = 
  pc  = c036c120 locked_inode_to_wb_and_lock_list+0x50/0x290
  cfar= c00b2a14 kvmppc_save_tm+0x168/0x16c
  lr  = c036f790 writeback_sb_inodes+0x310/0x590
  msr = 80009033   cr  = 24002482
  ctr = c0381e30   xer =    trap =  300
  dar =    dsisr = 4000
  0:mon> e
  cpu 0x0: Vector: 300 (Data Access) at [c000a4bc7660]
  pc: c036c120: locked_inode_to_wb_and_lock_list+0x50/0x290
  lr: c036f790: writeback_sb_inodes+0x310/0x590
  sp: c000a4bc78e0
 msr: 80009033
 dar: 0
   dsisr: 4000
current = 0xc000fbe96000
paca= 0xcfb8   softe: 0irq_happened: 0x01
  pid   = 17305, comm = kworker/u16:0
  Linux version 4.10.0-8-generic (buildd@bos01-ppc64el-001) (gcc version 6.3.0 
20161229 (Ubuntu 6.3.0-2ubuntu1) ) #10-Ubuntu SMP Mon Feb 13 14:00:06 UTC 2017 
(Ubuntu 4.10.0-8.10-generic 4.10.0-rc8)
  0:mon> d
      ||
  0:mon>

  
  Host and guest kernel build
  =
  4.10.0-8-generic

  
  OPAL firmware version
  
T side: FW860.20 (SV860_078)
Boot side : FW860.20 (SV860_078)

  
  == Comment: #4 - VIPIN K. PARASHAR  - 2017-03-03 
02:55:20 ==
  [140071.761707] Adding 153536k swap on /dev/loop0.  Priority:-2 extents:1 
across:153536k FS
  [140072.153143] Adding 153472k swap on /dev/loop0.  Priority:-2 extents:1 
across:153472k FS
  [140072.441833] Unable to handle kernel paging request for data at address 
0x
  [140072.442064] Faulting instruction address: 0xc036c120
  0:mon>

  0:mon> e
  cpu 0x0: Vector: 300 (Data Access) at [c000a4bc7660]
  pc: c036c120: locked_inode_to_wb_and_lock_list+0x50/0x290
  lr: c036f790: writeback_sb_inodes+0x310/0x590
  sp: c000a4bc78e0
 msr: 80009033
 dar: 0
   dsisr: 4000
current = 0xc000fbe96000
paca= 0xcfb8 softe: 0irq_happened: 0x01
  pid   = 17305, comm = kworker/u16:0
  Linux version 4.10.0-8-generic (buildd@bos01-ppc64el-001) (gcc version 6.3.0 
20161229 (Ubuntu 6.3.0-2ubuntu1) ) #10-Ubuntu SMP Mon Feb 13 14:00:06 UTC 2017 
(Ubuntu 4.10.0-8.10-generic 4.10.0-rc8)
  0:mon> t
  [c000a4bc7940] c036f790 writeback_sb_inodes+0x310/0x590
  [c000a4bc7a50] c036faf4 __writeback_inodes_wb+0xe4/0x150
  [c000a4bc7ab0] c036ff1c

[Kernel-packages] [Bug 1702998] Comment bridged from LTC Bugzilla

2017-07-17 Thread bugproxy 
--- Comment From chraj...@in.ibm.com 2017-07-18 01:04 EDT---
I believe the following two commits associated with "writeback" code are 
required for fixing this bug,

commit 03e262798884b0a5f948b17433afd80606cb3497
Author: Jan Kara 
Date:   Thu Mar 23 01:36:53 2017 +0100

block: Fix bdi assignment to bdev inode when racing with disk delete

When disk->fops->open() in __blkdev_get() returns -ERESTARTSYS, we
restart the process of opening the block device. However we forget to
switch bdev->bd_bdi back to noop_backing_dev_info and as a result bdev
inode will be pointing to a stale bdi. Fix the problem by setting
bdev->bd_bdi later when __blkdev_get() is already guaranteed to succeed.

commit f759741d9d913eb57784a94b9bca78b376fc26a9
Author: Jan Kara 
Date:   Thu Mar 23 01:37:00 2017 +0100

block: Fix oops in locked_inode_to_wb_and_lock_list()

When block device is closed, we call inode_detach_wb() in __blkdev_put()
which sets inode->i_wb to NULL. That is contrary to expectations that
inode->i_wb stays valid once set during the whole inode's lifetime and
leads to oops in wb_get() in locked_inode_to_wb_and_lock_list() because
inode_to_wb() returned NULL.

The reason why we called inode_detach_wb() is not valid anymore though.
BDI is guaranteed to stay along until we call bdi_put() from
bdev_evict_inode() so we can postpone calling inode_detach_wb() to that
moment.

Also add a warning to catch if someone uses inode_detach_wb() in a
dangerous way.

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Title:
  Ubuntu 17.04: Guest crashed @writeback_sb_inodes+0x310/0x590

Status in The Ubuntu-power-systems project:
  Triaged
Status in linux package in Ubuntu:
  Triaged

Bug description:
  == Comment: #0 - Lata Kuntal  - 2017-03-03 00:50:54 ==
  Ubuntu 17.04 guest dropped at xmon after crashing at 
writeback_sb_inodes+0x310/0x590. 
  The guest is having XFS rootfs and NPIV disk. It crashed after 30+ hrs of 
BASE and NFS stress test .

  Crash logs
  ===
  root@guskvm:~# virsh console gusg1 --force
  Connected to domain gusg1
  Escape character is ^]

  0:mon>
  0:mon> t
  [c000a4bc7940] c036f790 writeback_sb_inodes+0x310/0x590
  [c000a4bc7a50] c036faf4 __writeback_inodes_wb+0xe4/0x150
  [c000a4bc7ab0] c036ff1c wb_writeback+0x2cc/0x440
  [c000a4bc7b80] c0370c30 wb_workfn+0x150/0x560
  [c000a4bc7c90] c00ed8c0 process_one_work+0x2b0/0x5a0
  [c000a4bc7d20] c00edc58 worker_thread+0xa8/0x650
  [c000a4bc7dc0] c00f67b4 kthread+0x154/0x1a0
  [c000a4bc7e30] c000b4e8 ret_from_kernel_thread+0x5c/0x74
  0:mon> r
  R00 = c036f790   R16 = c000eca70300
  R01 = c000a4bc78e0   R17 = c000f7035240
  R02 = c143c900   R18 = 
  R03 = c000f7035150   R19 = 
  R04 = 0019   R20 = c000a4bc4000
  R05 = 0100   R21 = ff7f
  R06 =    R22 = c433d758
  R07 =    R23 = c433d738
  R08 = 00034995   R24 = 
  R09 =    R25 = 
  R10 = 8000   R26 = c000f70351d8
  R11 = c000a4bc7a40   R27 = 
  R12 = 2200   R28 = 0001
  R13 = cfb8   R29 = c433d728
  R14 =    R30 = c000f7035150
  R15 = c000f70351d8   R31 = 
  pc  = c036c120 locked_inode_to_wb_and_lock_list+0x50/0x290
  cfar= c00b2a14 kvmppc_save_tm+0x168/0x16c
  lr  = c036f790 writeback_sb_inodes+0x310/0x590
  msr = 80009033   cr  = 24002482
  ctr = c0381e30   xer =    trap =  300
  dar =    dsisr = 4000
  0:mon> e
  cpu 0x0: Vector: 300 (Data Access) at [c000a4bc7660]
  pc: c036c120: locked_inode_to_wb_and_lock_list+0x50/0x290
  lr: c036f790: writeback_sb_inodes+0x310/0x590
  sp: c000a4bc78e0
 msr: 80009033
 dar: 0
   dsisr: 4000
current = 0xc000fbe96000
paca= 0xcfb8   softe: 0irq_happened: 0x01
  pid   = 17305, comm = kworker/u16:0
  Linux version 4.10.0-8-generic (buildd@bos01-ppc64el-001) (gcc version 6.3.0 
20161229 (Ubuntu 6.3.0-2ubuntu1) ) #10-Ubuntu SMP Mon Feb 13 14:00:06 UTC 2017 
(Ubuntu 4.10.0-8.10-generic 4.10.0-rc8)
  0:mon> d
      ||
  0:mon>

  
  Host and guest kernel build
  =
  4.10.0-8-generic

  
  OPAL firmware version
  
T side: FW860.20 (SV860_078)
Boot side : FW860.20 (SV860_078)

  
  == Comment: #4 - VIPIN K. PARASHAR  - 2017-03-03 
02:55:20 ==
  [140071.761707] Adding 153536k

[Kernel-packages] [Bug 1702998] Comment bridged from LTC Bugzilla

2017-07-07 Thread bugproxy 
--- Comment From vipar...@in.ibm.com 2017-07-07 17:18 EDT---
This is same issue being debugged under LTC bug 149014 / LP1659111

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Title:
  Ubuntu 17.04: Guest crashed @writeback_sb_inodes+0x310/0x590

Status in The Ubuntu-power-systems project:
  New
Status in linux package in Ubuntu:
  New

Bug description:
  == Comment: #0 - Lata Kuntal  - 2017-03-03 00:50:54 ==
  Ubuntu 17.04 guest dropped at xmon after crashing at 
writeback_sb_inodes+0x310/0x590. 
  The guest is having XFS rootfs and NPIV disk. It crashed after 30+ hrs of 
BASE and NFS stress test .

  Crash logs
  ===
  root@guskvm:~# virsh console gusg1 --force
  Connected to domain gusg1
  Escape character is ^]

  0:mon>
  0:mon> t
  [c000a4bc7940] c036f790 writeback_sb_inodes+0x310/0x590
  [c000a4bc7a50] c036faf4 __writeback_inodes_wb+0xe4/0x150
  [c000a4bc7ab0] c036ff1c wb_writeback+0x2cc/0x440
  [c000a4bc7b80] c0370c30 wb_workfn+0x150/0x560
  [c000a4bc7c90] c00ed8c0 process_one_work+0x2b0/0x5a0
  [c000a4bc7d20] c00edc58 worker_thread+0xa8/0x650
  [c000a4bc7dc0] c00f67b4 kthread+0x154/0x1a0
  [c000a4bc7e30] c000b4e8 ret_from_kernel_thread+0x5c/0x74
  0:mon> r
  R00 = c036f790   R16 = c000eca70300
  R01 = c000a4bc78e0   R17 = c000f7035240
  R02 = c143c900   R18 = 
  R03 = c000f7035150   R19 = 
  R04 = 0019   R20 = c000a4bc4000
  R05 = 0100   R21 = ff7f
  R06 =    R22 = c433d758
  R07 =    R23 = c433d738
  R08 = 00034995   R24 = 
  R09 =    R25 = 
  R10 = 8000   R26 = c000f70351d8
  R11 = c000a4bc7a40   R27 = 
  R12 = 2200   R28 = 0001
  R13 = cfb8   R29 = c433d728
  R14 =    R30 = c000f7035150
  R15 = c000f70351d8   R31 = 
  pc  = c036c120 locked_inode_to_wb_and_lock_list+0x50/0x290
  cfar= c00b2a14 kvmppc_save_tm+0x168/0x16c
  lr  = c036f790 writeback_sb_inodes+0x310/0x590
  msr = 80009033   cr  = 24002482
  ctr = c0381e30   xer =    trap =  300
  dar =    dsisr = 4000
  0:mon> e
  cpu 0x0: Vector: 300 (Data Access) at [c000a4bc7660]
  pc: c036c120: locked_inode_to_wb_and_lock_list+0x50/0x290
  lr: c036f790: writeback_sb_inodes+0x310/0x590
  sp: c000a4bc78e0
 msr: 80009033
 dar: 0
   dsisr: 4000
current = 0xc000fbe96000
paca= 0xcfb8   softe: 0irq_happened: 0x01
  pid   = 17305, comm = kworker/u16:0
  Linux version 4.10.0-8-generic (buildd@bos01-ppc64el-001) (gcc version 6.3.0 
20161229 (Ubuntu 6.3.0-2ubuntu1) ) #10-Ubuntu SMP Mon Feb 13 14:00:06 UTC 2017 
(Ubuntu 4.10.0-8.10-generic 4.10.0-rc8)
  0:mon> d
      ||
  0:mon>

  
  Host and guest kernel build
  =
  4.10.0-8-generic

  
  OPAL firmware version
  
T side: FW860.20 (SV860_078)
Boot side : FW860.20 (SV860_078)

  
  == Comment: #4 - VIPIN K. PARASHAR  - 2017-03-03 
02:55:20 ==
  [140071.761707] Adding 153536k swap on /dev/loop0.  Priority:-2 extents:1 
across:153536k FS
  [140072.153143] Adding 153472k swap on /dev/loop0.  Priority:-2 extents:1 
across:153472k FS
  [140072.441833] Unable to handle kernel paging request for data at address 
0x
  [140072.442064] Faulting instruction address: 0xc036c120
  0:mon>

  0:mon> e
  cpu 0x0: Vector: 300 (Data Access) at [c000a4bc7660]
  pc: c036c120: locked_inode_to_wb_and_lock_list+0x50/0x290
  lr: c036f790: writeback_sb_inodes+0x310/0x590
  sp: c000a4bc78e0
 msr: 80009033
 dar: 0
   dsisr: 4000
current = 0xc000fbe96000
paca= 0xcfb8 softe: 0irq_happened: 0x01
  pid   = 17305, comm = kworker/u16:0
  Linux version 4.10.0-8-generic (buildd@bos01-ppc64el-001) (gcc version 6.3.0 
20161229 (Ubuntu 6.3.0-2ubuntu1) ) #10-Ubuntu SMP Mon Feb 13 14:00:06 UTC 2017 
(Ubuntu 4.10.0-8.10-generic 4.10.0-rc8)
  0:mon> t
  [c000a4bc7940] c036f790 writeback_sb_inodes+0x310/0x590
  [c000a4bc7a50] c036faf4 __writeback_inodes_wb+0xe4/0x150
  [c000a4bc7ab0] c036ff1c wb_writeback+0x2cc/0x440
  [c000a4bc7b80] c0370c30 wb_workfn+0x150/0x560
  [c000a4bc7c90] c00ed8c0 process_one_work+0x2b0/0x5a0
  [c000a4bc7d20] c00edc58 worker_thread+0xa8/0x650