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== Comment: #0 - Lata Kuntal <lakun...@in.ibm.com> - 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
[c0000000a4bc7940] c00000000036f790 writeback_sb_inodes+0x310/0x590
[c0000000a4bc7a50] c00000000036faf4 __writeback_inodes_wb+0xe4/0x150
[c0000000a4bc7ab0] c00000000036ff1c wb_writeback+0x2cc/0x440
[c0000000a4bc7b80] c000000000370c30 wb_workfn+0x150/0x560
[c0000000a4bc7c90] c0000000000ed8c0 process_one_work+0x2b0/0x5a0
[c0000000a4bc7d20] c0000000000edc58 worker_thread+0xa8/0x650
[c0000000a4bc7dc0] c0000000000f67b4 kthread+0x154/0x1a0
[c0000000a4bc7e30] c00000000000b4e8 ret_from_kernel_thread+0x5c/0x74
0:mon> r
R00 = c00000000036f790 R16 = c0000000eca70300
R01 = c0000000a4bc78e0 R17 = c0000000f7035240
R02 = c00000000143c900 R18 = 0000000000000000
R03 = c0000000f7035150 R19 = 0000000000000000
R04 = 0000000000000019 R20 = c0000000a4bc4000
R05 = 0000000000000100 R21 = ffffffffffffff7f
R06 = 0000000000000000 R22 = c00000000433d758
R07 = 0000000000000000 R23 = c00000000433d738
R08 = 0000000000034995 R24 = 0000000000000000
R09 = 0000000000000000 R25 = 0000000000000000
R10 = 0000000080000000 R26 = c0000000f70351d8
R11 = c0000000a4bc7a40 R27 = 0000000000000000
R12 = 0000000000002200 R28 = 0000000000000001
R13 = c00000000fb80000 R29 = c00000000433d728
R14 = 0000000000000000 R30 = c0000000f7035150
R15 = c0000000f70351d8 R31 = 0000000000000000
pc = c00000000036c120 locked_inode_to_wb_and_lock_list+0x50/0x290
cfar= c0000000000b2a14 kvmppc_save_tm+0x168/0x16c
lr = c00000000036f790 writeback_sb_inodes+0x310/0x590
msr = 8000000000009033 cr = 24002482
ctr = c000000000381e30 xer = 0000000000000000 trap = 300
dar = 0000000000000000 dsisr = 40000000
0:mon> e
cpu 0x0: Vector: 300 (Data Access) at [c0000000a4bc7660]
pc: c00000000036c120: locked_inode_to_wb_and_lock_list+0x50/0x290
lr: c00000000036f790: writeback_sb_inodes+0x310/0x590
sp: c0000000a4bc78e0
msr: 8000000000009033
dar: 0
dsisr: 40000000
current = 0xc0000000fbe96000
paca = 0xc00000000fb80000 softe: 0 irq_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
0000000000000000 **************** **************** | |
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 <vipar...@in.ibm.com> - 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
0x00000000
[140072.442064] Faulting instruction address: 0xc00000000036c120
0:mon>
0:mon> e
cpu 0x0: Vector: 300 (Data Access) at [c0000000a4bc7660]
pc: c00000000036c120: locked_inode_to_wb_and_lock_list+0x50/0x290
lr: c00000000036f790: writeback_sb_inodes+0x310/0x590
sp: c0000000a4bc78e0
msr: 8000000000009033
dar: 0
dsisr: 40000000
current = 0xc0000000fbe96000
paca = 0xc00000000fb80000 softe: 0 irq_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
[c0000000a4bc7940] c00000000036f790 writeback_sb_inodes+0x310/0x590
[c0000000a4bc7a50] c00000000036faf4 __writeback_inodes_wb+0xe4/0x150
[c0000000a4bc7ab0] c00000000036ff1c wb_writeback+0x2cc/0x440
[c0000000a4bc7b80] c000000000370c30 wb_workfn+0x150/0x560
[c0000000a4bc7c90] c0000000000ed8c0 process_one_work+0x2b0/0x5a0
[c0000000a4bc7d20] c0000000000edc58 worker_thread+0xa8/0x650
[c0000000a4bc7dc0] c0000000000f67b4 kthread+0x154/0x1a0
[c0000000a4bc7e30] c00000000000b4e8 ret_from_kernel_thread+0x5c/0x74
0:mon> r
R00 = c00000000036f790 R16 = c0000000eca70300
R01 = c0000000a4bc78e0 R17 = c0000000f7035240
R02 = c00000000143c900 R18 = 0000000000000000
R03 = c0000000f7035150 R19 = 0000000000000000
R04 = 0000000000000019 R20 = c0000000a4bc4000
R05 = 0000000000000100 R21 = ffffffffffffff7f
R06 = 0000000000000000 R22 = c00000000433d758
R07 = 0000000000000000 R23 = c00000000433d738
R08 = 0000000000034995 R24 = 0000000000000000
R09 = 0000000000000000 R25 = 0000000000000000
R10 = 0000000080000000 R26 = c0000000f70351d8
R11 = c0000000a4bc7a40 R27 = 0000000000000000
R12 = 0000000000002200 R28 = 0000000000000001
R13 = c00000000fb80000 R29 = c00000000433d728
R14 = 0000000000000000 R30 = c0000000f7035150
R15 = c0000000f70351d8 R31 = 0000000000000000
pc = c00000000036c120 locked_inode_to_wb_and_lock_list+0x50/0x290
cfar= c0000000000b2a14 kvmppc_save_tm+0x168/0x16c
lr = c00000000036f790 writeback_sb_inodes+0x310/0x590
msr = 8000000000009033 cr = 24002482
ctr = c000000000381e30 xer = 0000000000000000 trap = 300
dar = 0000000000000000 dsisr = 40000000
0:mon> S
msr = 8000000000001033 sprg0 = 0000000000000000
pvr = 00000000004b0201 sprg1 = c00000000fb80000
dec = 00000000b56746ff sprg2 = c00000000fb80000
sp = c0000000a4bc7100 sprg3 = 0000000000000000
toc = c00000000143c900 dar = 0000000000000400
srr0 = 000000000008c59c srr1 = 0000000000001033 dsisr = 40000000
dscr = 0000000000000000 ppr = 0000000000000000 pir = 00000030
dpdes = 0000000000000000 tir = 0000000000000000 cir = 00000000
fscr = 0000000000000180 tar = 0000000000000000 pspb = 00000000
mmcr0 = 0000000080000000 mmcr1 = 0000000000000000 mmcr2 = 0000000000000000
pmc1 = 00000000 pmc2 = 00000000 pmc3 = 00000000 pmc4 = 00000000
mmcra = 0000000000000000 siar = 0000000000000000 pmc5 = b9ad0e28
sdar = 0000000000000000 sier = 0000000000000000 pmc6 = 7f0fdfbe
ebbhr = 0000000000000000 ebbrr = 0000000000000000 bescr = 0000000000000000
0:mon>
Crash is due to Kernel hitting a DSI while executing
locked_inode_to_wb_and_lock_list routine.
== Comment: #8 - VIPIN K. PARASHAR <vipar...@in.ibm.com> - 2017-03-03 05:07:03
==
Its crashing at fs/fs-writeback.c
static struct bdi_writeback *
locked_inode_to_wb_and_lock_list(struct inode *inode)
__releases(&inode->i_lock)
__acquires(&wb->list_lock)
{
while (true) {
struct bdi_writeback *wb = inode_to_wb(inode);
/*
* inode_to_wb() association is protected by both
* @inode->i_lock and @wb->list_lock but list_lock nests
* outside i_lock. Drop i_lock and verify that the
* association hasn't changed after acquiring list_lock.
*/
wb_get(wb);
<-----------
spin_unlock(&inode->i_lock);
spin_lock(&wb->list_lock);
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
Status: New
** Tags: architecture-ppc64le bugnameltc-152231 severity-critical
targetmilestone-inin1710
--
Ubuntu 17.04: Guest crashed @writeback_sb_inodes+0x310/0x590
https://bugs.launchpad.net/bugs/1702998
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