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Date: Thu, 14 Jul 2016 20:26:25 +0800 From: Ken <jinjian@...wei.com> To: "Ouyangzhaowei (Charles)" <ouyangzhaowei@...wei.com>, "Zhaojun (Euler)" <zhao.zhaojun@...wei.com>, <ubuntu-bugs@...ts.ubuntu.com>, <linux-kernel@...r.kernel.org> Subject: Re: xen/blkfront: Ubuntu 14.04 crashes when it is booting On 2016/7/12 15:30, uvptools wrote: > Please give us some suggests to deal with this problem. > > Thanks & best wishes. > > On 2016/7/12 14:58, Ouyangzhaowei (Charles) wrote: >> Hi all, >> >> Recently we found that a VM which runs Ubuntu 14.04 went to crash when >> it was booting, and the VM was run on xen-4.1.2, seems like the >> xen-blkfront was stuck when add_disk() was called, and the core dump >> shows the stack log like below: >> >> [ 5.514140] usb 2-1: SerialNumber: 42 >> [ 5.436081] xenbus_probe_frontend: Waiting for devices to >> initialise: 25s...20s...15s...10s...5s...0s... >> [ 61.164383] random: nonblocking pool is initialized >> [ 240.188145] INFO: task xenwatch:275 blocked for more than 120 seconds. >> [ 240.190214] Not tainted 3.13.0-24-generic #46-Ubuntu >> [ 240.191211] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" >> disables this message. >> [ 35.436090] >> 235s...230s...225s...220s...215s...210s...205s...200s...195s...190s...185s...180s...175s...170s...165s...160s...155s...150s...145s...140s...135s...130s...125s...120s...1 >> >> 15s...110s...105s...100s...95s...90s...85s...80s...75s...70s...65s...60s...55s...50s...45s...40s...35s... >> >> [ 240.192231] xenwatch D >> [ 240.193211] ffff88003ce34440 0 275 2 0x00000000 >> [ 240.194269] ffff88003b4dd9b8 0000000000000002 ffff88003b4a17f0 >> ffff88003b4ddfd8 >> [ 240.195315] 0000000000014440 0000000000014440 ffff88003b4a17f0 >> ffff88003ce34cd8 >> [ 240.196392] ffff88003f7d28e8 ffff88003b4dda40 0000000000000002 >> ffffffff8114df10 >> [ 240.197453] Call Trace: >> [ 240.198483] [<ffffffff8114df10>] ? wait_on_page_read+0x60/0x60 >> [ 240.199522] [<ffffffff8171a1ad>] io_schedule+0x9d/0x140 >> [ 240.200537] [<ffffffff8114df1e>] sleep_on_page+0xe/0x20 >> [ 240.201537] [<ffffffff8171a738>] __wait_on_bit_lock+0x48/0xb0 >> [ 240.202540] [<ffffffff811f23a0>] ? blkdev_write_begin+0x30/0x30 >> [ 240.203624] [<ffffffff8114e02a>] __lock_page+0x6a/0x70 >> [ 240.204644] [<ffffffff810aaed0>] ? autoremove_wake_function+0x40/0x40 >> [ 240.205650] [<ffffffff811f23b8>] ? blkdev_readpage+0x18/0x20 >> [ 240.206648] [<ffffffff8114ee40>] do_read_cache_page+0x100/0x1a0 >> [ 240.207649] [<ffffffff8114ef19>] read_cache_page+0x19/0x30 >> [ 240.208692] [<ffffffff8134386d>] read_dev_sector+0x2d/0x90 >> [ 240.209672] [<ffffffff813445f0>] ? check_partition+0x240/0x240 >> [ 240.210642] [<ffffffff81344660>] adfspart_check_ICS+0x70/0x280 >> [ 240.211596] [<ffffffff81368bd9>] ? snprintf+0x39/0x40 >> [ 240.212591] [<ffffffff813445f0>] ? check_partition+0x240/0x240 >> [ 240.213520] [<ffffffff813444b8>] check_partition+0x108/0x240 >> [ 240.214424] [<ffffffff813440e4>] rescan_partitions+0xb4/0x2c0 >> [ 240.215305] [<ffffffff811f3714>] __blkdev_get+0x384/0x4c0 >> [ 240.216174] [<ffffffff811f3a15>] blkdev_get+0x1c5/0x340 >> [ 240.217271] [<ffffffff811d34f0>] ? unlock_new_inode+0x50/0x70 >> [ 240.218126] [<ffffffff811f2263>] ? bdget+0x133/0x150 >> [ 240.218984] [<ffffffff81341981>] add_disk+0x3a1/0x4b0 >> [ 240.219841] [<ffffffff814b40e1>] blkback_changed+0xd71/0x10b0 >> [ 240.220697] [<ffffffff8142f79d>] xenbus_otherend_changed+0xad/0x110 >> [ 240.221533] [<ffffffff8142eae0>] ? >> unregister_xenbus_watch+0x230/0x230 >> [ 240.222330] [<ffffffff81431a73>] backend_changed+0x13/0x20 >> [ 240.223101] [<ffffffff8142eb7f>] xenwatch_thread+0x9f/0x160 >> [ 240.223852] [<ffffffff810aae90>] ? prepare_to_wait_event+0x100/0x100 >> [ 240.224593] [<ffffffff8108b312>] kthread+0xd2/0xf0 >> [ 240.225309] [<ffffffff8108b240>] ? kthread_create_on_node+0x1d0/0x1d0 >> [ 240.226138] [<ffffffff8172637c>] ret_from_fork+0x7c/0xb0 >> [ 240.226830] [<ffffffff8108b240>] ? kthread_create_on_node+0x1d0/0x1d0 >> [ 240.340091] 30s...25s...20s...15s...10s...5s...0s... >> [ 270.340821] >> [ 270.341507] xenbus_probe_frontend: Device with no driver: >> device/vbd/51760 >> [ 270.342469] xenbus_probe_frontend: Timeout connecting to device: >> device/vif/0 (local state 1, remote state 2) >> [ 270.344062] xenbus_probe_frontend: Timeout connecting to device: >> device/vif/1 (local state 1, remote state 2) >> [ 270.345798] xenbus_probe_frontend: Timeout connecting to device: >> device/vif/2 (local state 1, remote state 2) >> [ 270.347381] regulator-dummy: disabling >> [ 270.348274] Magic number: 4:767:195 >> [ 270.349178] rtc_cmos 00:03: setting system clock to 2016-06-27 >> 20:16:13 UTC (1467058573) >> [ 270.350133] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found >> [ 270.350966] EDD information not available. >> [ 270.351845] PM: Hibernation image not present or could not be loaded. >> [ 270.351903] md: Waiting for all devices to be available before >> autodetect >> [ 270.352778] md: If you don't use raid, use raid=noautodetect >> [ 270.353913] md: Autodetecting RAID arrays. >> [ 270.354784] md: Scanned 0 and added 0 devices. >> [ 270.355645] md: autorun ... >> [ 270.356512] md: ... autorun DONE. >> [ 270.357446] VFS: Cannot open root device "mapper/ubuntu--vg-root" >> or unknown-block(0,0): error -6 >> [ 270.358403] Please append a correct "root=" boot option; here are >> the available partitions: >> [ 270.359323] ca00 10485760 xvda driver: vbd >> [ 270.360263] 0b00 1048575 sr0 driver: sr >> [ 270.361183] Kernel panic - not syncing: VFS: Unable to mount root >> fs on unknown-block(0,0) >> [ 270.362136] CPU: 1 PID: 1 Comm: swapper/0 Not tainted >> 3.13.0-24-generic #46-Ubuntu >> [ 270.363107] Hardware name: Xen HVM domU, BIOS Unknown 06/25/2016 >> [ 270.364085] 0000000000008001 ffff88003bc3bdf0 ffffffff81715a64 >> ffffffff81a3a0f0 >> [ 270.364252] ffff88003bc3be68 ffffffff8170ec65 3030623000000010 >> ffff88003bc3be78 >> [ 270.364252] ffff88003bc3be18 ffffff0000307273 ffff88003bc3be88 >> 00000000000000a4 >> [ 270.364252] Call Trace: >> [ 270.364252] [<ffffffff81715a64>] dump_stack+0x45/0x56 >> [ 270.364252] [<ffffffff8170ec65>] panic+0xc8/0x1d7 >> [ 270.364252] [<ffffffff81d3546a>] mount_block_root+0x225/0x2b0 >> [ 270.364252] [<ffffffff81d35692>] mount_root+0x53/0x56 >> [ 270.364252] [<ffffffff81d35801>] prepare_namespace+0x16c/0x1a4 >> [ 270.364252] [<ffffffff81d3516e>] kernel_init_freeable+0x1f3/0x200 >> [ 270.364252] [<ffffffff81d348e5>] ? do_early_param+0x88/0x88 >> [ 270.364252] [<ffffffff81703f40>] ? rest_init+0x80/0x80 >> [ 270.364252] [<ffffffff81703f4e>] kernel_init+0xe/0x130 >> [ 270.364252] [<ffffffff8172637c>] ret_from_fork+0x7c/0xb0 >> [ 270.364252] [<ffffffff81703f40>] ? rest_init+0x80/0x80 >> >> Any ideas? Thanks >> >> >> . >>
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