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6aee6723f1
Booting with the QEMU command line: "qemu-system-x86_64 -append root=/dev/vda rootfstype=ext4 ..." will panic if ext4 is not builtin and a request to load the ext4 module fails. [ 1.729006] VFS: Cannot open root device "vda" or unknown-block(253,0): error -19 [ 1.730603] Please append a correct "root=" boot option; here are the available partitions: [ 1.732323] fd00 256000 vda [ 1.732329] driver: virtio_blk [ 1.734194] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(253,0) [ 1.734771] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.4.0-rc2+ #53 [ 1.735194] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.10.2-1ubuntu1 04/01/2014 [ 1.735772] Call Trace: [ 1.735950] <TASK> [ 1.736113] dump_stack_lvl+0x32/0x50 [ 1.736367] panic+0x108/0x310 [ 1.736570] mount_block_root+0x161/0x310 [ 1.736849] ? rdinit_setup+0x40/0x40 [ 1.737088] prepare_namespace+0x10c/0x180 [ 1.737393] kernel_init_freeable+0x354/0x450 [ 1.737707] ? rest_init+0xd0/0xd0 [ 1.737945] kernel_init+0x16/0x130 [ 1.738196] ret_from_fork+0x1f/0x30 As a hint, print all the bdev fstypes which are available. [akpm@linux-foundation.org: fix spelling in printk message] Link: https://lkml.kernel.org/r/20230518035321.1672-1-angus.chen@jaguarmicro.com Signed-off-by: Angus Chen <angus.chen@jaguarmicro.com> Acked-by: Nick Desaulniers <ndesaulniers@google.com> Cc: Masahiro Yamada <masahiroy@kernel.org> Cc: Mike Rapoport (IBM) <rppt@kernel.org> Cc: Paul E. McKenney <paulmck@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.