linux-kernel - [lkp] [dm thin] 216076705d: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)

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Message-ID: <87zj05oqpd.fsf@yhuang-dev.intel.com>
Date:	Tue, 29 Sep 2015 11:21:50 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Mike Snitzer <snitzer@...hat.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: [lkp] [dm thin] 216076705d: Kernel panic - not syncing: VFS: Unable
 to mount root fs on unknown-block(1,0)

FYI, we noticed the below changes on

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit 216076705d6ac291d42e0f8dd85e6a0da98c0fa3 ("dm thin: disable discard support for thin devices if pool's is disabled")


[   19.907521] md: Waiting for all devices to be available before autodetect
[   19.908422] md: If you don't use raid, use raid=noautodetect
[   19.911745] md: Autodetecting RAID arrays.
[   19.912384] md: Scanned 0 and added 0 devices.
[   19.913020] md: autorun ...
[   19.913525] md: ... autorun DONE.
[   19.914227] RAMDISK: gzip image found at block 0
[   20.373805] RAMDISK: incomplete write (14363 != 28156)
[   20.374568] write error
[   20.592977] FAT-fs (ram0): utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive!
[   20.594607] FAT-fs (ram0): utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive!
[   20.597157] VFS: could not find a valid V7 on ram0.
[   20.598143] ufs: ufs was compiled with read-only support, can't be mounted as read-write
[   20.599302] VFS: Cannot open root device "ram0" or unknown-block(1,0): error -30
[   20.600365] Please append a correct "root=" boot option; here are the available partitions:
[   20.601521] 0100           65536 ram0  (driver?)
[   20.602267] 0101           65536 ram1  (driver?)
[   20.602996] 0102           65536 ram2  (driver?)
[   20.603720] 0103           65536 ram3  (driver?)
[   20.604450] 0104           65536 ram4  (driver?)
[   20.605177] 0105           65536 ram5  (driver?)
[   20.605911] 0106           65536 ram6  (driver?)
[   20.606653] 0107           65536 ram7  (driver?)
[   20.607379] 0108           65536 ram8  (driver?)
[   20.608106] 0109           65536 ram9  (driver?)
[   20.608826] 010a           65536 ram10  (driver?)
[   20.609565] 010b           65536 ram11  (driver?)
[   20.610317] 010c           65536 ram12  (driver?)
[   20.611052] 010d           65536 ram13  (driver?)
[   20.611782] 010e           65536 ram14  (driver?)
[   20.612522] 010f           65536 ram15  (driver?)
[   20.613271] fb00       268435456 vda  driver: virtio_blk
[   20.614084] fb10       268435456 vdb  driver: virtio_blk
[   20.614876] fb20       268435456 vdc  driver: virtio_blk
[   20.615670] fb30       268435456 vdd  driver: virtio_blk
[   20.616471] fb40       268435456 vde  driver: virtio_blk
[   20.617271] fb50       268435456 vdf  driver: virtio_blk
[   20.618081] 1600         4194302 hdc  driver: ide-cdrom
[   20.618867] 1f00            4096 mtdblock0  (driver?)
[   20.619637] 1f01          131072 mtdblock1  (driver?)
[   20.620428] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)
[   20.621566] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.3.0-rc1-00001-g2160767 #1
[   20.622638] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   20.623836]  0000000000000000 ffff88009b2d3de0 ffffffff8173de06 ffffffff83a8abb1
[   20.625167]  ffff88009b2d3e60 ffffffff811a401f 0000000000000010 ffff88009b2d3e70
[   20.626500]  ffff88009b2d3e08 ffffffff811a0031 ffff88009b2d3e78 ffff88009b2cc860
[   20.627832] Call Trace:
[   20.628271]  [<ffffffff8173de06>] dump_stack+0x4b/0x63
[   20.628981]  [<ffffffff811a401f>] panic+0xce/0x20f
[   20.629651]  [<ffffffff811a0031>] ? SYSC_perf_event_open+0x61d/0x9d9
[   20.630483]  [<ffffffff84630522>] mount_block_root+0x20f/0x226
[   20.631260]  [<ffffffff846307af>] mount_root+0x153/0x15c
[   20.631990]  [<ffffffff84631322>] ? initrd_load+0x2d4/0x2e3
[   20.632744]  [<ffffffff84630924>] prepare_namespace+0x16c/0x1a4
[   20.633539]  [<ffffffff846301bf>] kernel_init_freeable+0x25f/0x274
[   20.634360]  [<ffffffff82e380b9>] ? rest_init+0x140/0x140
[   20.635097]  [<ffffffff82e380c7>] kernel_init+0xe/0xdf
[   20.635806]  [<ffffffff82e444af>] ret_from_fork+0x3f/0x70
[   20.636541]  [<ffffffff82e380b9>] ? rest_init+0x140/0x140
[   20.637342] Kernel Offset: disabled

Elapsed time: 40


Thanks,
Ying Huang

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