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Bug#818951: marked as done (linux: [armv7] kernel panic on power down of Cubieboard (A20))

Your message dated Sat, 10 Sep 2016 23:35:18 -0400
with message-id <20160911033518.tt6mkugg7x3aokbo@alcyone>
and subject line Re: linux: [armv7] kernel panic on power down of Cubieboard (A20)
has caused the Debian Bug report #818951,
regarding linux: [armv7] kernel panic on power down of Cubieboard (A20)
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
818951: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=818951
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Source: linux
Version: 4.4.6-1
Severity: normal
Tags: upstream

Dear Maintainer,

After upgrading from jessie to stretch, my Cubieboard (Allwinner A20)
no longer powers down; instead, the machine halts with a kernel panic
while continuing to be powered.

I captured the following output on the serial console:

# poweroff
[  654.415345] systemd-shutdown[1]: Sending SIGTERM to remaining processes...
[  654.457107] systemd-journald[272]: Received SIGTERM from PID 1 (systemd-shutdow).
[  654.576175] systemd-shutdown[1]: Sending SIGKILL to remaining processes...
[  654.614229] systemd-shutdown[1]: Unmounting file systems.
[  654.624854] systemd-shutdown[1]: Remounting '/' read-only with options 'ssd,discard,space_cache,subvolid=5,subvol=/'.
[  654.900813] BTRFS info (device dm-0): disk space caching is enabled
[  655.043127] systemd-shutdown[1]: Remounting '/' read-only with options 'ssd,discard,space_cache,subvolid=5,subvol=/'.
[  655.058439] BTRFS info (device dm-0): disk space caching is enabled
[  655.069255] systemd-shutdown[1]: All filesystems unmounted.
[  655.079341] systemd-shutdown[1]: Deactivating swaps.
[  655.089177] systemd-shutdown[1]: All swaps deactivated.
[  655.099060] systemd-shutdown[1]: Detaching loop devices.
[  655.109904] systemd-shutdown[1]: All loop devices detached.
[  655.120212] systemd-shutdown[1]: Detaching DM devices.
[  655.131915] systemd-shutdown[1]: Detaching DM 254:0.
[  655.141723] systemd-shutdown[1]: Could not detach DM /dev/dm-0: Device or resource busy
[  655.154470] systemd-shutdown[1]: Not all DM devices detached, 1 left.
[  655.165667] systemd-shutdown[1]: Cannot finalize remaining DM devices, continuing.
[  655.180404] systemd-shutdown[1]: Failed to finalize  DM devices, ignoring
[  655.192305] systemd-shutdown[1]: Powering off.
[  655.201618] kvm: exiting hardware virtualization
[  655.211292] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[  655.221730] sd 0:0:0:0: [sda] Stopping disk
[  655.323690] reboot: Power down
[  657.329374] i2c i2c-0: mv64xxx: I2C bus locked, block: 1, time_left: 0
[  657.342678] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000000
[  657.342678]
[  657.361647] CPU: 0 PID: 1 Comm: systemd-shutdow Not tainted 4.4.0-1-armmp-lpae #1 Debian 4.4.6-1
[  657.375569] Hardware name: Allwinner sun7i (A20) Family
[  657.385995] [<c0037098>] (unwind_backtrace) from [<c00311b4>] (show_stack+0x20/0x24)
[  657.399051] [<c00311b4>] (show_stack) from [<c02fc27c>] (dump_stack+0xa0/0xb4)
[  657.411627] [<c02fc27c>] (dump_stack) from [<c0170170>] (panic+0xc0/0x258)
[  657.423871] [<c0170170>] (panic) from [<c0070b1c>] (do_exit+0xa54/0xa78)
[  657.435964] [<c0070b1c>] (do_exit) from [<c008f948>] (SyS_reboot+0x1c8/0x238)
[  657.448589] [<c008f948>] (SyS_reboot) from [<c002cbc0>] (ret_fast_syscall+0x0/0x34)
[  657.461841] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000000
[  657.461841]

In order to pinpoint the kernel version that introduced the
regression, I tested the following kernels from snapshot.d.o:

linux-image-4.0.0-2-armmp-lpae  4.0.8-2  OK
linux-image-4.1.0-2-armmp-lpae  4.1.6-1  OK
linux-image-4.2.0-1-armmp-lpae  4.2.6-3  PANIC
linux-image-4.3.0-1-armmp-lpae  4.3.5-1  PANIC
linux-image-4.4.0-1-armmp-lpae  4.4.6-1  PANIC

The regression has been introduced in Linux 4.2. I compared the serial
console output of Linux 4.2/4.3/4.4, and, apart from the address offsets,
the stack traces of the kernel panic are identical.

Please let me know how I can help with further debugging.

Regards,
Peter

--- End Message ---
--- Begin Message --- 
Version: 4.6.4-1

With this kernel version my Cubieboard powers down again.

Peter

--- End Message ---
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