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SubjectRe: linux-next boot error: kernel panic: VFS: Unable to mount root fs on unknown-block(0,0)
On Mon, Feb 8, 2021 at 2:39 PM syzbot
<syzbot+b22ad1a79afb8da726c5@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 8d374d0d Add linux-next specific files for 20210208
> git tree: linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=13de8a40d00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=ced6adcf6aff98d6
> dashboard link: https://syzkaller.appspot.com/bug?extid=b22ad1a79afb8da726c5
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+b22ad1a79afb8da726c5@syzkaller.appspotmail.com
>
> netconsole: network logging started
> gtp: GTP module loaded (pdp ctx size 104 bytes)
> rdma_rxe: loaded
> cfg80211: Loading compiled-in X.509 certificates for regulatory database
> cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
> ALSA device list:
> #0: Dummy 1
> #1: Loopback 1
> #2: Virtual MIDI Card 1
> md: Waiting for all devices to be available before autodetect
> md: If you don't use raid, use raid=noautodetect
> md: Autodetecting RAID arrays.
> md: autorun ...
> md: ... autorun DONE.
> VFS: Cannot open root device "sda1" or unknown-block(0,0): error -6

Has anything changed in linux-next related to block devices?... It was
supposed to boot from a standard GCE VM disk, but it does not seem to
be probed by the kernel (should be /dev/sda).

> Please append a correct "root=" boot option; here are the available partitions:
> 0100 4096 ram0
> (driver?)
> 0101 4096 ram1
> (driver?)
> 0102 4096 ram2
> (driver?)
> 0103 4096 ram3
> (driver?)
> 0104 4096 ram4
> (driver?)
> 0105 4096 ram5
> (driver?)
> 0106 4096 ram6
> (driver?)
> 0107 4096 ram7
> (driver?)
> 0108 4096 ram8
> (driver?)
> 0109 4096 ram9
> (driver?)
> 010a 4096 ram10
> (driver?)
> 010b 4096 ram11
> (driver?)
> 010c 4096 ram12
> (driver?)
> 010d 4096 ram13
> (driver?)
> 010e 4096 ram14
> (driver?)
> 010f 4096 ram15
> (driver?)
> 1f00 128 mtdblock0
> (driver?)
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
> CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.11.0-rc6-next-20210208-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:79 [inline]
> dump_stack+0x107/0x163 lib/dump_stack.c:120
> panic+0x306/0x73d kernel/panic.c:231
> mount_block_root+0x3f8/0x4dd init/do_mounts.c:445
> mount_root+0x1af/0x1f5 init/do_mounts.c:561
> prepare_namespace+0x1ff/0x234 init/do_mounts.c:613
> kernel_init_freeable+0x671/0x689 init/main.c:1550
> kernel_init+0xd/0x1b8 init/main.c:1426
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
> Kernel Offset: disabled
> Rebooting in 86400 seconds..
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
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