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[Bug 1546439] [NEW] ISST:LTE: Regression: roselp2 Oops in kernel during setup io

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From: Launchpad Bug Tracker <1546439@xxxxxxxxxxxxxxxxxx>
Date: Tue, 29 Mar 2016 16:44:13 -0000
Reply-to: Bug 1546439 <1546439@xxxxxxxxxxxxxxxxxx>
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== Comment: #0 - Alton L. Pundt <apundt@xxxxxxxxxx> - 2016-02-08 17:14:17 ==
---Problem Description---
was setting up i/o scenerios and kernel oopsed
 
Contact Information = A.P. Pundt  apundt@xxxxxxxxxx 
 
---uname output---
4.4.0-2-generic
 
Machine Type = 8286-42A 
 
---System Hang---
 system hung.  does not respond to ping
 
---Debugger---
A debugger is not configured
 
---Steps to Reproduce---
 login as root:
cd /kte/tools/
setup io
 
Stack trace output:
 [  148.026515] NIP [c000000000529cd0] blk_account_io_start+0x150/0x290
[  148.026518] LR [c000000000529cac] blk_account_io_start+0x12c/0x290
[  148.026520] Call Trace:
[  148.026523] [c0000006da9437d0] [c000000000529cac] blk_account_io_start+0x12c/0x290 (unreliable)
[  148.026527] [c0000006da943810] [c00000000052b20c] blk_queue_bio+0x1dc/0x4c0
[  148.026530] [c0000006da943870] [c00000000052881c] generic_make_request+0x16c/0x240
[  148.026534] [c0000006da9438d0] [c0000000005289c4] submit_bio+0xd4/0x1f0
[  148.026537] [c0000006da943980] [c00000000033b1a4] mpage_readpages+0x174/0x1c0
[  148.026541] [c0000006da943a70] [c000000000333b7c] blkdev_readpages+0x4c/0x70
[  148.026545] [c0000006da943ab0] [c00000000023cf18] __do_page_cache_readahead+0x1a8/0x2e0
[  148.026548] [c0000006da943b80] [c00000000023d1c8] ondemand_readahead+0x178/0x2f0
[  148.026552] [c0000006da943be0] [c00000000022aadc] generic_file_read_iter+0x41c/0x6b0
[  148.026555] [c0000006da943cc0] [c000000000334d38] blkdev_read_iter+0x68/0xa0
[  148.026559] [c0000006da943cf0] [c0000000002dc80c] new_sync_read+0xcc/0x110
[  148.026562] [c0000006da943d90] [c0000000002dd614] vfs_read+0xa4/0x1c0
[  148.026565] [c0000006da943de0] [c0000000002de71c] SyS_read+0x6c/0x110
[  148.026568] [c0000006da943e30] [c000000000009204] system_call+0x38/0xb4
[  148.026571] Instruction dump:

 
Oops output:
 [  148.026436] Oops: Kernel access of bad area, sig: 11 [#1]

 
System Dump Info:
  The system was configured to capture a dump, however a dump was not produced.
 

== Comment: #2 - Alton L. Pundt <apundt@xxxxxxxxxx> - 2016-02-08 17:16:09 ==
console screen during time of oops:

root@roselp2:~# [  148.026417] Unable to handle kernel paging request for data at address 0x779ea0000
[  148.026433] Faulting instruction address: 0xc000000000529cd0
[  148.026436] Oops: Kernel access of bad area, sig: 11 [#1]
[  148.026438] SMP NR_CPUS=2048 NUMA pSeries
[  148.026442] Modules linked in: rpcsec_gss_krb5 nfsv4 nfs fscache binfmt_misc dm_round_robin pseries_rng dm_multipath rtc_generic nfsd auth_rpcgss nfs_acl lockd grace sunrpc autofs4 btrfs xor raid6_pq mlx4_en vxlan ip6_udp_tunnel udp_tunnel ibmvscsi mlx4_core
[  148.026460] CPU: 192 PID: 5726 Comm: parted Not tainted 4.4.0-2-generic #16-Ubuntu
[  148.026463] task: c0000006da8d5100 ti: c0000006da940000 task.ti: c0000006da940000
[  148.026466] NIP: c000000000529cd0 LR: c000000000529cac CTR: 0000000000000000
[  148.026468] REGS: c0000006da943550 TRAP: 0300   Not tainted  (4.4.0-2-generic)
[  148.026471] MSR: 8000000000009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24002828  XER: 00000000
[  148.026478] CFAR: c000000000008468 DAR: 0000000779ea0000 DSISR: 40000000 SOFTE: 0
GPR00: c000000000529cac c0000006da9437d0 c000000001583800 0000000000000001
GPR04: 0000000000001000 c00000074eec14a0 c00000074eec14e8 0000000000000800
GPR08: 0000000779ea0000 0000000000000000 0000000000000000 c000000000ae08e0
GPR12: 0000000024002222 c000000007b52000 0000000051633600 0000000000080001
GPR16: c0000006d944efa0 0000000000000001 0000000000001000 0000000000000001
GPR20: c0000006d944ef00 0000000000020000 0000000000000001 c000000000332700
GPR24: c00000070d405000 0000000000000100 0000000000000200 fffffffffffffffb
GPR28: c000000749810730 c00000071eb4d400 0000000000000000 00000000000000c0
[  148.026515] NIP [c000000000529cd0] blk_account_io_start+0x150/0x290
[  148.026518] LR [c000000000529cac] blk_account_io_start+0x12c/0x290
[  148.026520] Call Trace:
[  148.026523] [c0000006da9437d0] [c000000000529cac] blk_account_io_start+0x12c/0x290 (unreliable)
[  148.026527] [c0000006da943810] [c00000000052b20c] blk_queue_bio+0x1dc/0x4c0
[  148.026530] [c0000006da943870] [c00000000052881c] generic_make_request+0x16c/0x240
[  148.026534] [c0000006da9438d0] [c0000000005289c4] submit_bio+0xd4/0x1f0
[  148.026537] [c0000006da943980] [c00000000033b1a4] mpage_readpages+0x174/0x1c0
[  148.026541] [c0000006da943a70] [c000000000333b7c] blkdev_readpages+0x4c/0x70
[  148.026545] [c0000006da943ab0] [c00000000023cf18] __do_page_cache_readahead+0x1a8/0x2e0
[  148.026548] [c0000006da943b80] [c00000000023d1c8] ondemand_readahead+0x178/0x2f0
[  148.026552] [c0000006da943be0] [c00000000022aadc] generic_file_read_iter+0x41c/0x6b0
[  148.026555] [c0000006da943cc0] [c000000000334d38] blkdev_read_iter+0x68/0xa0
[  148.026559] [c0000006da943cf0] [c0000000002dc80c] new_sync_read+0xcc/0x110
[  148.026562] [c0000006da943d90] [c0000000002dd614] vfs_read+0xa4/0x1c0
[  148.026565] [c0000006da943de0] [c0000000002de71c] SyS_read+0x6c/0x110
[  148.026568] [c0000006da943e30] [c000000000009204] system_call+0x38/0xb4
[  148.026571] Instruction dump:
[  148.026573] e89c0060 e87c00c0 48016631 60000000 7c7d1b78 e9230358 792a07a1 408200e4
[  148.026578] 39400000 886d02ca 994d02ca e90d0030 <7d49402a> 394a0001 7d49412a 4bae6cbd
[  148.026584] ---[ end trace 8c0008700e05e0ed ]---
[  148.028168]
[  148.028173] ------------[ cut here ]------------
[  148.028175] WARNING: at /build/linux-X_Ge0M/linux-4.4.0/kernel/exit.c:661
[  148.028177] Modules linked in: rpcsec_gss_krb5 nfsv4 nfs fscache binfmt_misc dm_round_robin pseries_rng dm_multipath rtc_generic nfsd auth_rpcgss nfs_acl lockd grace sunrpc autofs4 btrfs xor raid6_pq mlx4_en vxlan ip6_udp_tunnel udp_tunnel ibmvscsi mlx4_core
[  148.028193] CPU: 192 PID: 5726 Comm: parted Tainted: G      D         4.4.0-2-generic #16-Ubuntu
[  148.028195] task: c0000006da8d5100 ti: c0000006da940000 task.ti: c0000006da940000
[  148.028198] NIP: c0000000000bc2a8 LR: c0000000000bc28c CTR: 00000000006338e4
[  148.028201] REGS: c0000006da9430a0 TRAP: 0700   Tainted: G      D          (4.4.0-2-generic)
[  148.028203] MSR: 8000000000021033 <SF,ME,IR,DR,RI,LE>  CR: 28002224  XER: 00000001
[  148.028209] CFAR: c000000000144b9c SOFTE: 0
GPR00: c0000000000bc28c c0000006da943320 c000000001583800 0000000000000000
GPR04: 0000000000000000 c0000006da8d5100 ffffffffffffffff 0000000000000000
GPR08: 0000000000000000 c0000006da943ad0 c000000749810730 0000000000003ff0
GPR12: 0000000000002200 c000000007b52000 0000000051633600 0000000000080001
GPR16: c0000006d944efa0 0000000000000001 0000000000001000 0000000000000001
GPR20: c0000006d944ef00 0000000000020000 0000000000000001 c0000006da8d5100
GPR24: c00000070d405000 0000000000000100 00000000000000c0 c0000000015e8260
GPR28: 0000000000000000 000000000000000b 000000000000000b c0000006da943550
[  148.028241] NIP [c0000000000bc2a8] do_exit+0x78/0xbf0
[  148.028244] LR [c0000000000bc28c] do_exit+0x5c/0xbf0
[  148.028245] Call Trace:
[  148.028247] [c0000006da943320] [c0000000000bc28c] do_exit+0x5c/0xbf0 (unreliable)
[  148.028251] [c0000006da9433e0] [c000000000020af4] die+0x314/0x470
[  148.028255] [c0000006da943470] [c000000000050ab8] bad_page_fault+0xd8/0x150
[  148.028258] [c0000006da9434e0] [c000000000008680] handle_page_fault+0x2c/0x30
[  148.028262] --- interrupt: 300 at blk_account_io_start+0x150/0x290
[  148.028262]     LR = blk_account_io_start+0x12c/0x290
[  148.028266] [c0000006da943810] [c00000000052b20c] blk_queue_bio+0x1dc/0x4c0
[  148.028269] [c0000006da943870] [c00000000052881c] generic_make_request+0x16c/0x240
[  148.028272] [c0000006da9438d0] [c0000000005289c4] submit_bio+0xd4/0x1f0
[  148.028275] [c0000006da943980] [c00000000033b1a4] mpage_readpages+0x174/0x1c0
[  148.028279] [c0000006da943a70] [c000000000333b7c] blkdev_readpages+0x4c/0x70
[  148.028282] [c0000006da943ab0] [c00000000023cf18] __do_page_cache_readahead+0x1a8/0x2e0
[  148.028285] [c0000006da943b80] [c00000000023d1c8] ondemand_readahead+0x178/0x2f0
[  148.028289] [c0000006da943be0] [c00000000022aadc] generic_file_read_iter+0x41c/0x6b0
[  148.028291] [c0000006da943cc0] [c000000000334d38] blkdev_read_iter+0x68/0xa0
[  148.028294] [c0000006da943cf0] [c0000000002dc80c] new_sync_read+0xcc/0x110
[  148.028297] [c0000006da943d90] [c0000000002dd614] vfs_read+0xa4/0x1c0
[  148.028300] [c0000006da943de0] [c0000000002de71c] SyS_read+0x6c/0x110
[  148.028304] [c0000006da943e30] [c000000000009204] system_call+0x38/0xb4
[  148.028306] Instruction dump:
[  148.028307] 60000000 60000000 eaed02a0 7ee3bb78 480888d1 60000000 e93707c0 2fa90000
[  148.028312] 419e0014 e9490000 7faa4800 419e093c <0fe00000> 78290464 8129000c 552502ef
[  148.028318] ---[ end trace 8c0008700e05e0ee ]---
[  148.028821] Unable to handle kernel paging request for data at address 0x00000348
[  148.028824] Faulting instruction address: 0xc000000000528e9c
[  148.028827] Oops: Kernel access of bad area, sig: 11 [#2]
[  148.028829] SMP NR_CPUS=2048 NUMA pSeries
[  148.028831] Modules linked in: rpcsec_gss_krb5 nfsv4 nfs fscache binfmt_misc dm_round_robin pseries_rng dm_multipath rtc_generic nfsd auth_rpcgss nfs_acl lockd grace sunrpc autofs4 btrfs xor raid6_pq mlx4_en vxlan ip6_udp_tunnel udp_tunnel ibmvscsi mlx4_core
[  148.028846] CPU: 192 PID: 0 Comm: swapper/192 Tainted: G      D W       4.4.0-2-generic #16-Ubuntu
[  148.028850] task: c000000773e0bd90 ti: c00000077f9c0000 task.ti: c000000773ea4000
[  148.028852] NIP: c000000000528e9c LR: c000000000528f80 CTR: c00000000075b870
[  148.028855] REGS: c00000077f9c38a0 TRAP: 0300   Tainted: G      D W        (4.4.0-2-generic)
[  148.028857] MSR: 8000000000009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 48022882  XER: 00000001
[  148.028864] CFAR: c000000000008468 DAR: 0000000000000348 DSISR: 40000000 SOFTE: 1
GPR00: c000000000528f80 c00000077f9c3b20 c000000001583800 c000000749810730
GPR04: 0000000000010000 c0000000015baa60 0000000000000000 0000000000000600
GPR08: c000000001873800 0000000000000000 c0000000015b3800 d0000000073d4d90
GPR12: 0000000000002200 c000000007b52000 c000000000b03a18 0000000000200040
GPR16: 0000000000000000 c00000077f9c0000 c000000000f7dd00 c0000000015b2200
GPR20: 00000000ffff6b84 0000000000000009 c00000000187aaf8 0000000000000000
GPR24: 0000000000000000 0000000000000000 0000000000000000 0000000000000005
GPR28: c000000749810730 0000000000010000 0000000000000080 c000000749810730
[  148.028896] NIP [c000000000528e9c] blk_account_io_completion+0x8c/0x100
[  148.028900] LR [c000000000528f80] blk_update_request+0x70/0x490
[  148.028902] Call Trace:
[  148.028904] [c00000077f9c3b20] [c00000077f9c3b70] 0xc00000077f9c3b70 (unreliable)
[  148.028907] [c00000077f9c3b50] [c000000000528f80] blk_update_request+0x70/0x490
[  148.028912] [c00000077f9c3be0] [c0000000007467d0] scsi_end_request+0x70/0x250
[  148.028915] [c00000077f9c3c50] [c00000000074a294] scsi_io_completion+0xe4/0x710
[  148.028918] [c00000077f9c3d10] [c00000000073dcf8] scsi_finish_command+0x148/0x200
[  148.028922] [c00000077f9c3d90] [c000000000749788] scsi_softirq_done+0x198/0x200
[  148.028925] [c00000077f9c3e10] [c000000000534354] blk_done_softirq+0xb4/0xe0
[  148.028928] [c00000077f9c3e50] [c0000000000be518] __do_softirq+0x188/0x3a0
[  148.028932] [c00000077f9c3f40] [c0000000000be9a8] irq_exit+0xc8/0x100
[  148.028935] [c00000077f9c3f60] [c00000000001130c] __do_irq+0x8c/0x190
[  148.028938] [c00000077f9c3f90] [c000000000024760] call_do_irq+0x14/0x24
[  148.028941] [c000000773ea79f0] [c0000000000114a8] do_IRQ+0x98/0x140
[  148.028944] [c000000773ea7a40] [c000000000002594] hardware_interrupt_common+0x114/0x180
[  148.028950] --- interrupt: 501 at plpar_hcall_norets+0x1c/0x28
[  148.028950]     LR = check_and_cede_processor+0x34/0x50
[  148.028954] [c000000773ea7d30] [c0000000008f61d0] check_and_cede_processor+0x20/0x50 (unreliable)
[  148.028959] [c000000773ea7d90] [c0000000008f63f8] shared_cede_loop+0x68/0x170
[  148.028961] [c000000773ea7dd0] [c0000000008f3460] cpuidle_enter_state+0x160/0x3c0
[  148.028965] [c000000773ea7e30] [c000000000118c18] call_cpuidle+0x78/0xd0
[  148.028968] [c000000773ea7e70] [c000000000118fac] cpu_startup_entry+0x33c/0x450
[  148.028972] [c000000773ea7f30] [c00000000004559c] start_secondary+0x33c/0x360
[  148.028976] [c000000773ea7f90] [c000000000008b6c] start_secondary_prolog+0x10/0x14
[  148.028978] Instruction dump:
[  148.028980] ebe1fff8 7c0803a6 4e800020 60000000 60420000 a0ed0008 3d420003 e8df00c8
[  148.028985] 79291f28 38aa7260 7bdeba42 78e71f24 <e9460348> 7d05382a 7d4a4214 7d0a482a
[  148.028990] ---[ end trace 8c0008700e05e0ef ]---
[  148.030823]
[  150.030883] Kernel panic - not syncing: Fatal exception in interrupt
[  150.042512] ---[ end Kernel panic - not syncing: Fatal exception in interrupt


root@conelp2:~# multipath -ll
mpathd (1IBM_IPR-0_68405D4000002DC0) dm-1 IBM,IPR-0   68405D40
size=361G features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 1:2:0:0 sde 8:64  active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
  `- 0:2:1:0 sdb 8:16  active ready running
mpathc (1IBM_IPR-0_68405D4000002CC0) dm-0 IBM,IPR-0   68405D40
size=361G features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 1:2:1:0 sdf 8:80  active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
  `- 0:2:0:0 sda 8:0   active ready running
mpatha (1IBM_IPR-0_68405D4000003800) dm-2 IBM,IPR-0   68405D40
size=723G features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 1:2:2:0 sdg 8:96  active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
  `- 0:2:2:0 sdc 8:32  active ready running
root@conelp2:~# service multipath-tools stop
root@conelp2:~# multipath -F
root@conelp2:~# multipath -ll
root@conelp2:~# ls -la /dev/mapper/
total 0
drwxr-xr-x  2 root root      60 Feb  9 12:37 .
drwxr-xr-x 16 root root    6960 Feb  9 12:37 ..
crw-------  1 root root 10, 236 Feb  9 12:33 control

root@conelp2:~# /kte/tools/setup io
...
Removing unprotected SW RAID devices...
Removing unprotected LVM devices...
Configuring MPIO...
Configuring partitions...
Configuring 12 Partitions for sdc...done
   created sdc1 sdc2 sdc3 sdc5 sdc6 sdc7 sdc8 sdc9 sdc10 sdc11 sdc12 sdc13 successfully
Configuring 12 Partitions for sdb...[  625.917304] Unable to handle kernel paging request for data at address 0x27ada0000
[  625.917323] Faulting instruction address: 0xc000000000529cd0
cpu 0x94: Vector: 300 (Data Access) at [c000000251ed7550]
    pc: c000000000529cd0: blk_account_io_start+0x150/0x290
    lr: c000000000529cac: blk_account_io_start+0x12c/0x290
    sp: c000000251ed77d0
   msr: 8000000000009033
   dar: 27ada0000
 dsisr: 40000000
  current = 0xc000000251e57b20
  paca    = 0xc000000007b37e00   softe: 0        irq_happened: 0x01
    pid   = 8979, comm = parted
enter ? for help
[c000000251ed7810] c00000000052b20c blk_queue_bio+0x1dc/0x4c0
[c000000251ed7870] c00000000052881c generic_make_request+0x16c/0x240
[c000000251ed78d0] c0000000005289c4 submit_bio+0xd4/0x1f0
[c000000251ed7980] c00000000033b1a4 mpage_readpages+0x174/0x1c0
[c000000251ed7a70] c000000000333b7c blkdev_readpages+0x4c/0x70
[c000000251ed7ab0] c00000000023cf18 __do_page_cache_readahead+0x1a8/0x2e0
[c000000251ed7b80] c00000000023d1c8 ondemand_readahead+0x178/0x2f0
[c000000251ed7be0] c00000000022aadc generic_file_read_iter+0x41c/0x6b0
[c000000251ed7cc0] c000000000334d38 blkdev_read_iter+0x68/0xa0
[c000000251ed7cf0] c0000000002dc80c new_sync_read+0xcc/0x110
[c000000251ed7d90] c0000000002dd614 vfs_read+0xa4/0x1c0
[c000000251ed7de0] c0000000002de71c SyS_read+0x6c/0x110
[c000000251ed7e30] c000000000009204 system_call+0x38/0xb4
--- Exception: c01 (System Call) at 00003fff98b63f38
SP (3fffe47e64c0) is in userspace

== Comment: #8 - YUECHANG E. MEI <yemei@xxxxxxxxxx> - 2016-02-09 16:05:10 ==
I have verified that setup io would trigger system crash when we configure the partitions on single path disks. If we enable the multipath service and configure partitions on /devmapper/mpathn, everything will be fine.

Problem was recreated in roselp2, and it is in xmon now. Please take a
look!


== Comment: #19 - YUECHANG E. MEI <yemei@xxxxxxxxxx> - 2016-02-15 18:39:23 ==
conelp2 has finished ST test, and I could recreate the issue with following steps:

Steps to recreate:
1. run "service multipath-tools stop"
2. run " multipath -F"
3. run "multipath -ll", to make sure there is no multipath seeing by the lpar
4. modify "/kte/tools/io/scen/__lpar__" in kte server with

partition|sdc|12
partition|sdb|12
partition|sdd|12

admndisk|sdc1|ext3
blast|sdc2|ext4
fstest|sdc3|ext3
aio|sdc5|ext3

admndisk|sdb1|ext3
blast|sdb2|ext4
fstest|sdb3|ext3
aio|sdb5|ext3

admndisk|sdd1|ext3
blast|sdd2|ext4
fstest|sdd3|ext3
aio|sdd5|ext3

Error:
root@conelp2:~# /kte/tools/setup io
.....
Configuring partitions...
Configuring 12 Partitions for sdc...done
   created sdc1 sdc2 sdc3 sdc5 sdc6 sdc7 sdc8 sdc9 sdc10 sdc11 sdc12 sdc13 successfully
Configuring 12 Partitions for sdb...[  675.658649] Unable to handle kernel paging request f                                                                                                  or data at address 0x27aae0000
[  675.658669] Faulting instruction address: 0xc000000000529e30
[  675.658675] Oops: Kernel access of bad area, sig: 11 [#1]
[  675.658677] SMP NR_CPUS=2048 NUMA pSeries
[  675.658683] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache                                                                                                   rpadlpar_io rpaphp binfmt_misc pseries_rng rtc_generic scsi_dh_alua dm_round_robin dm_mult                                                                                                  ipath sunrpc autofs4 xfs libcrc32c btrfs xor raid6_pq ses enclosure be2net lpfc vxlan scsi_                                                                                                  transport_fc ipr ip6_udp_tunnel udp_tunnel
[  675.658711] CPU: 137 PID: 11532 Comm: parted Not tainted 4.4.0-4-generic #19-Ubuntu
[  675.658715] task: c00000025b1f5f90 ti: c00000025b214000 task.ti: c00000025b214000
[  675.658719] NIP: c000000000529e30 LR: c000000000529e0c CTR: 0000000000000000
[  675.658722] REGS: c00000025b217560 TRAP: 0300   Not tainted  (4.4.0-4-generic)
[  675.658725] MSR: 8000000000009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24002828  XER: 00000000
[  675.658736] CFAR: c000000000008468 DAR: 000000027aae0000 DSISR: 40000000 SOFTE: 0
GPR00: c000000000529e0c c00000025b2177e0 c000000001593900 0000000000000001
GPR04: 00000000039cf900 c000000253c700c0 c000000253c70150 00000000039cf800
GPR08: 000000027aae0000 0000000000000000 0000000000000000 c00000027faac300
GPR12: 0000000024002222 c000000007b31580 000000005fe63600 0000000000080001
GPR16: c0000002287bf2a0 0000000000000001 0000000000000200 0000000000000001
GPR20: c0000002287bf200 0000000000020000 0000000000000001 c000000000332840
GPR24: c00000026d01e400 0000000000000100 0000000000000200 c000000244230258
GPR28: c0000002504a5ee0 c00000022fc46c00 0000000000000000 0000000000000089
[  675.658785] NIP [c000000000529e30] blk_account_io_start+0x150/0x290
[  675.658789] LR [c000000000529e0c] blk_account_io_start+0x12c/0x290
[  675.658792] Call Trace:
[  675.658795] [c00000025b2177e0] [c000000000529e0c] blk_account_io_start+0x12c/0x290 (unre                                                                                                  liable)
[  675.658800] [c00000025b217820] [c00000000052b36c] blk_queue_bio+0x1dc/0x4c0
[  675.658805] [c00000025b217880] [c000000000528964] generic_make_request+0x144/0x230
[  675.658810] [c00000025b2178d0] [c000000000528b24] submit_bio+0xd4/0x1f0
[  675.658815] [c00000025b217980] [c00000000033b2e4] mpage_readpages+0x174/0x1c0
[  675.658820] [c00000025b217a70] [c000000000333cbc] blkdev_readpages+0x4c/0x70
[  675.658826] [c00000025b217ab0] [c00000000023d038] __do_page_cache_readahead+0x1a8/0x2e0
[  675.658830] [c00000025b217b80] [c00000000023d2e8] ondemand_readahead+0x178/0x2f0
[  675.658835] [c00000025b217be0] [c00000000022abfc] generic_file_read_iter+0x41c/0x6b0
[  675.658840] [c00000025b217cc0] [c000000000334e78] blkdev_read_iter+0x68/0xa0
[  675.658844] [c00000025b217cf0] [c0000000002dc92c] new_sync_read+0xcc/0x110
[  675.658848] [c00000025b217d90] [c0000000002dd734] vfs_read+0xa4/0x1c0
[  675.658853] [c00000025b217de0] [c0000000002de83c] SyS_read+0x6c/0x110
[  675.658858] [c00000025b217e30] [c000000000009204] system_call+0x38/0xb4
[  675.658861] Instruction dump:
[  675.658863] e89c0060 e87c00c0 480165d1 60000000 7c7d1b78 e9230358 792a07a1 408200e4
[  675.658871] 39400000 886d02ca 994d02ca e90d0030 <7d49402a> 394a0001 7d49412a 4bae6b5d
[  675.658882] ---[ end trace be1c5abd542c2196 ]---
[  675.661579]
[  675.661626] Sending IPI to other CPUs
[  675.679881] IPI complete

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64le bot-comment bugnameltc-136788 patch severity-critical targetmilestone-inin1604
-- 
ISST:LTE: Regression: roselp2 Oops in kernel during setup io
https://bugs.launchpad.net/bugs/1546439
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