------- 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? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1702998 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 <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); To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1702998/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
