linux-kernel - [REGRESSION] "add a disk_uevent helper" breaks booting Andorid w/ dynamic partitions

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Date:   Mon, 22 Feb 2021 15:10:22 -0800
From:   John Stultz <john.stultz@...aro.org>
To:     Christoph Hellwig <hch@....de>, Tejun Heo <tj@...nel.org>,
        Jens Axboe <axboe@...nel.dk>,
        David Anderson <dvander@...gle.com>
Cc:     linux-block@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
        Todd Kjos <tkjos@...gle.com>,
        Amit Pundir <amit.pundir@...aro.org>,
        Alistair Delva <adelva@...gle.com>
Subject: [REGRESSION] "add a disk_uevent helper" breaks booting Andorid w/
 dynamic partitions

Hey all,
  After updating to Linus' HEAD today I found my db845c board wouldn't
boot to android with the error below.

I was able to bisect the boot regression down to "block: add a
disk_uevent helper":
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bc359d03c7ec1bf3b86d03bafaf6bbb21e6414fd

And have validated that reverting that change seems to get things working again.

I don't really know the dynamic partition DM details well, so any tips
as to what might be going wrong here would be appreciated!

thanks
-john

[   25.782268] init: [libfs_mgr]Skipping mounting '/dev/block/dm-0'
[   25.788373] init: [libfs_mgr]Failed to open '/dev/block/dm-0': No
such file or directory
[   25.796579] init:
[libfs_mgr]__mount(source=/dev/block/dm-0(missing),target=/system,type=ext4)=-1:
No such file or directory
[   25.807978] init: Failed to mount /system: No such file or directory
[   25.814466] init: Failed to mount required partitions early ...
[   25.820757] init: InitFatalReboot: signal 6
[   25.833635] init: #00 pc 00000000003936a8  /init
(UnwindStackCurrent::UnwindFromContext(unsigned long, void*)+96)
[   25.844001] init: #01 pc 00000000002f1df0  /init
(android::init::InitFatalReboot(int)+208)
[   25.852340] init: #02 pc 00000000002f21d8  /init
(android::init::InstallRebootSignalHandlers()::$_22::__invoke(int)+32)
[   25.863211] init: #03 pc 000000000000053c  [vdso:0000007f97c34000]
[   25.869449] init: #04 pc 000000000045ffb0  /init (abort+176)
[   25.875163] init: #05 pc 00000000002f714c  /init
(android::init::InitAborter(char const*)+44)
[   25.883760] init: #06 pc 000000000034dc98  /init
(android::base::SetAborter(std::__1::function<void (char
const*)>&&)::$_3::__invoke(char const*)+80)
[   25.897241] init: #07 pc 000000000034d840  /init
(android::base::LogMessage::~LogMessage()+360)
[   25.906002] init: #08 pc 00000000002e93a8  /init
(android::init::FirstStageMain(int, char**)+6648)
[   25.915039] init: #09 pc 000000000045ee58  /init
(__real_libc_init(void*, void (*)(), int (*)(int, char**, char**),
structors_array_t const*, bionic_tc)
[   25.929411] init: Reboot ending, jumping to kernel