On Fri, Jul 17, 2020 at 10:55:48PM +0200, Marek Szyprowski wrote:
> Hi Christoph,
>
> On 14.07.2020 21:04, Christoph Hellwig wrote:
> > Just use d_genocide instead of iterating through the root directory with
> > cumbersome userspace-like APIs. This also ensures we actually remove files
> > that are not direct children of the root entry, which the old code failed
> > to do.
> >
> > Fixes: df52092f3c97 ("fastboot: remove duplicate unpack_to_rootfs()")
> > Signed-off-by: Christoph Hellwig <hch@xxxxxx>
>
> This patch breaks initrd support ;-(
>
> I use initrd to deploy kernel modules on my test machines. It was
> automatically mounted on /initrd. /lib/modules is just a symlink to
> /initrd. I know that initrd support is marked as deprecated, but it
> would be really nice to give people some time to update their machines
> before breaking the stuff.
Looks like your setup did rely on the /dev/ notes from the built-in
initramfs to be preserved.
Can you comment out the call to d_genocide? It seems like for your
the fact that clean_rootfs didn't actually clean up was a feature and
not a bug.
I guess the old, pre-2008 code also wouldn't have worked for you in
that case.
>
> Here is the log:
>
> Kernel image @ 0x40007fc0 [ 0x000000 - 0x6dd9c8 ]
> ## Flattened Device Tree blob at 41000000
> Booting using the fdt blob at 0x41000000
> Loading Ramdisk to 4de3c000, end 50000000 ... OK
> Loading Device Tree to 4de2d000, end 4de3b206 ... OK
>
> Starting kernel ...
>
> [ 0.000000] Booting Linux on physical CPU 0x900
> ...
>
> [ 0.000000] Kernel command line: root=PARTLABEL=rootfs rootwait
> console=tty1 console=ttySAC2,115200n8 earlycon rootdelay=2
> ...
>
> [ 1.853631] Trying to unpack rootfs image as initramfs...
> [ 1.858661] rootfs image is not initramfs (invalid magic at start of
> compressed archive); looks like an initrd
> ...
> [ 2.204776] Freeing initrd memory: 34576K
>
> ...
>
> [ 4.635360] Warning: unable to open an initial console.
> [ 4.640706] Waiting 2 sec before mounting root device...
> ...
> [ 6.776007] Failed to create /dev/root: -2
> [ 6.778989] VFS: Cannot open root device "PARTLABEL=rootfs" or
> unknown-block(179,6): error -2
> [ 6.787200] Please append a correct "root=" boot option; here are the
> available partitions:
> [ 6.795693] 0100 65536 ram0
> [ 6.795697] (driver?)
> [ 6.801459] 0101 65536 ram1
> [ 6.801462] (driver?)
> [ 6.807532] 0102 65536 ram2
> [ 6.807535] (driver?)
> [ 6.813674] 0103 65536 ram3
> [ 6.813677] (driver?)
> [ 6.819760] 0104 65536 ram4
> [ 6.819763] (driver?)
> [ 6.832610] 0105 65536 ram5
> [ 6.832613] (driver?)
> [ 6.848685] 0106 65536 ram6
> [ 6.848688] (driver?)
> [ 6.864590] 0107 65536 ram7
> [ 6.864593] (driver?)
> [ 6.880504] 0108 65536 ram8
> [ 6.880507] (driver?)
> [ 6.896248] 0109 65536 ram9
> [ 6.896251] (driver?)
> [ 6.911828] 010a 65536 ram10
> [ 6.911831] (driver?)
> [ 6.927447] 010b 65536 ram11
> [ 6.927450] (driver?)
> [ 6.942976] 010c 65536 ram12
> [ 6.942979] (driver?)
> [ 6.958190] 010d 65536 ram13
> [ 6.958193] (driver?)
> [ 6.973205] 010e 65536 ram14
> [ 6.973208] (driver?)
> [ 6.988105] 010f 65536 ram15
> [ 6.988108] (driver?)
> [ 7.002897] b300 15388672 mmcblk0
> [ 7.002901] driver: mmcblk
> [ 7.018061] b301 8192 mmcblk0p1
> 654b73ea-7c04-c24d-9642-2a186649605c
> [ 7.018064]
> [ 7.035359] b302 61440 mmcblk0p2
> 7ef6fb83-0d6c-8c44-826b-ad11df290e0c
> [ 7.035362]
> [ 7.052589] b303 102400 mmcblk0p3
> 34883856-7d52-d548-a196-718efbd06876
> [ 7.052592]
> [ 7.069744] b304 153600 mmcblk0p4
> 8d4410d0-a4ff-c447-abb9-73350dcdd2d6
> [ 7.069747]
> [ 7.086888] b305 1572864 mmcblk0p5
> 485c2c17-a9e8-9c45-bb68-e0748a2bb1f1
> [ 7.086890]
> [ 7.103991] b306 3072000 mmcblk0p6
> 7fb2bbf3-e064-2343-b169-e69c18dbb43e
> [ 7.103993]
> [ 7.121290] b307 10413039 mmcblk0p7
> b0ee9150-6b6a-274b-9ec3-703d29072555
> [ 7.121292]
> [ 7.138722] Kernel panic - not syncing: VFS: Unable to mount root fs
> on unknown-block(179,6)
> [ 7.151482] CPU: 0 PID: 1 Comm: swapper/0 Not tainted
> 5.8.0-rc5-00064-g38d014f6d446 #8823
> [ 7.164026] Hardware name: Samsung Exynos (Flattened Device Tree)
> [ 7.174556] [<c011188c>] (unwind_backtrace) from [<c010d27c>]
> (show_stack+0x10/0x14)
> [ 7.186799] [<c010d27c>] (show_stack) from [<c05182e4>]
> (dump_stack+0xbc/0xe8)
> [ 7.198533] [<c05182e4>] (dump_stack) from [<c01272e0>]
> (panic+0x128/0x354)
> [ 7.210002] [<c01272e0>] (panic) from [<c1001580>]
> (mount_block_root+0x1a8/0x240)
> [ 7.221961] [<c1001580>] (mount_block_root) from [<c1001738>]
> (mount_root+0x120/0x13c)
> [ 7.234325] [<c1001738>] (mount_root) from [<c10018ac>]
> (prepare_namespace+0x158/0x194)
> [ 7.246751] [<c10018ac>] (prepare_namespace) from [<c0ab7684>]
> (kernel_init+0x8/0x118)
> [ 7.259086] [<c0ab7684>] (kernel_init) from [<c0100114>]
> (ret_from_fork+0x14/0x20)tatic void __init populate_initrd_image(char *err)
>
> Best regards
> --
> Marek Szyprowski, PhD
> Samsung R&D Institute Poland
---end quoted text---
