Re: [Xen-devel] [x86_64, vsyscall] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

[Fengguang Wu <fengguang.wu@xxxxxxxxx>]

On Wed, Jul 30, 2014 at 01:14:06PM -0700, Andy Lutomirski wrote:
> On Wed, Jul 30, 2014 at 8:33 AM, Fengguang Wu <fengguang.wu@xxxxxxxxx> wrote:
> > On Wed, Jul 30, 2014 at 07:58:13AM -0700, Andy Lutomirski wrote:
> >> On Wed, Jul 30, 2014 at 7:29 AM, Fengguang Wu <fengguang.wu@xxxxxxxxx> 
> >> wrote:
> >> > Greetings,
> >> >
> >> > 0day kernel testing robot got the below dmesg and the first bad commit is
> >> >
> >> > git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/vsyscall
> >> > commit 442aba0c6131f0c41dfc5edb6bfb88335556523f
> >> > Author:     Andy Lutomirski <luto@xxxxxxxxxxxxxx>
> >> > AuthorDate: Mon Jun 16 18:50:12 2014 -0700
> >> > Commit:     Andy Lutomirski <luto@xxxxxxxxxxxxxx>
> >> > CommitDate: Mon Jun 30 14:32:44 2014 -0700
> >>
> >> Was this a merge?
> >
> > It's not a merge commit.
> 
> Hmm.  It looks like that commit is from a version of x86/vsyscall
> that's rather out-of-date.  Is it possible that the script is testing
> an old version of the tree?  I haven't touched it in almost a week, I
> think.

The current luto/x86/vsyscall HEAD commit
1e67c32df4dddf763271c3ace52fdec66877740c has these errors:

+-----------------------------------------------------------+---+
|                                                           |   |
+-----------------------------------------------------------+---+
| boot_successes                                            | 1 |
| boot_failures                                             | 9 |
| general_protection_fault                                  | 3 |
| RIP:crypto_ahash_setkey                                   | 3 |
| Kernel_panic-not_syncing:Fatal_exception                  | 8 |
| backtrace:cryptomgr_test                                  | 8 |
| BUG:unable_to_handle_kernel_paging_request                | 5 |
| Oops                                                      | 5 |
| RIP:kzfree                                                | 5 |
| Kernel_panic-not_syncing:Attempted_to_kill_init_exitcode= | 1 |
| INFO:suspicious_RCU_usage                                 | 1 |
+-----------------------------------------------------------+---+

mount: can't read '/proc/mounts': No such file or directory
[   32.915296] init[1]: segfault at ffffffffff600400 ip ffffffffff600400 sp 
00007fff994dc878 error 15
[   32.916078] init[1]: segfault at ffffffffff600400 ip ffffffffff600400 sp 
00007fff994dbe78 error 15
[   32.916925] Kernel panic - not syncing: Attempted to kill init! 
exitcode=0x0000000b
[   32.916925]
[   32.917698] CPU: 0 PID: 1 Comm: init Not tainted 3.16.0-rc4-00019-g1e67c32 #1
[   32.918301]  0000000000000000 ffff880000033cc0 ffffffff81ff4e8f 
ffff880000033d38
[   32.918944]  ffffffff81ff1972 ffff880000000010 ffff880000033d48 
ffff880000033ce8
[   32.919611]  ffffffff82c440c0 000000000000000b 8c6318c6318c6320 
00000007aa003caf
[   32.920011] Call Trace:
[   32.920011]  [<ffffffff81ff4e8f>] dump_stack+0x19/0x1b
[   32.920011]  [<ffffffff81ff1972>] panic+0xcb/0x1fb
[   32.920011]  [<ffffffff81093b3c>] do_exit+0x3dd/0x80f
[   32.920011]  [<ffffffff810b0739>] ? local_clock+0x14/0x1d
[   32.920011]  [<ffffffff8109400f>] do_group_exit+0x75/0xb4
[   32.920011]  [<ffffffff8109c803>] get_signal_to_deliver+0x48a/0x4aa
[   32.920011]  [<ffffffff8100231a>] do_signal+0x43/0x5ba
[   32.920011]  [<ffffffff810b4b95>] ? lock_release_holdtime+0x6c/0x77
[   32.920011]  [<ffffffff810b83d1>] ? lock_release_non_nested+0xd0/0x21e
[   32.920011]  [<ffffffff810b0662>] ? sched_clock_cpu+0x4e/0x62
[   32.920011]  [<ffffffff810fd43f>] ? might_fault+0x4f/0x9c
[   32.920011]  [<ffffffff810b617f>] ? trace_hardirqs_off_caller+0x36/0xa5
[   32.920011]  [<ffffffff820048d8>] ? retint_signal+0x11/0x99
[   32.920011]  [<ffffffff810028b5>] do_notify_resume+0x24/0x53
[   32.920011]  [<ffffffff82004914>] retint_signal+0x4d/0x99
[   32.920011] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 
0xffffffff80000000-0xffffffff9fffffff)
[   32.920011] drm_kms_helper: panic occurred, switching back to text console
[   32.920011]
[   32.920011] ===============================
[   32.920011] [ INFO: suspicious RCU usage. ]
[   32.920011] 3.16.0-rc4-00019-g1e67c32 #1 Not tainted
[   32.920011] -------------------------------
[   32.920011] include/linux/rcupdate.h:539 Illegal context switch in RCU 
read-side critical section!
[   32.920011]
[   32.920011] other info that might help us debug this:
[   32.920011]
[   32.920011]
[   32.920011] rcu_scheduler_active = 1, debug_locks = 0
[   32.920011] 3 locks held by init/1:
[   32.920011]  #0:  (panic_lock){....+.}, at: [<ffffffff81ff18ea>] 
panic+0x43/0x1fb
[   32.920011]  #1:  (rcu_read_lock){......}, at: [<ffffffff810ab895>] 
rcu_lock_acquire+0x0/0x23
[   32.920011]  #2:  (&dev->mode_config.mutex){+.+.+.}, at: 
[<ffffffff814a7847>] drm_fb_helper_panic+0x5d/0xab
[   32.920011]
[   32.920011] stack backtrace:
[   32.920011] CPU: 0 PID: 1 Comm: init Not tainted 3.16.0-rc4-00019-g1e67c32 #1
[   32.920011]  0000000000000000 ffff8800000339d0 ffffffff81ff4e8f 
ffff880000033a00
[   32.920011]  ffffffff810b8840 ffffffff82836348 000000000000024a 
0000000000000000
[   32.920011]  ffff880010144008 ffff880000033a10 ffffffff810adcff 
ffff880000033a38
[   32.920011] Call Trace:
[   32.920011]  [<ffffffff81ff4e8f>] dump_stack+0x19/0x1b
[   32.920011]  [<ffffffff810b8840>] lockdep_rcu_suspicious+0xf6/0xff
[   32.920011]  [<ffffffff810adcff>] rcu_preempt_sleep_check+0x45/0x47
[   32.920011]  [<ffffffff810afefb>] __might_sleep+0x17/0x19a
[   32.920011]  [<ffffffff820007ce>] mutex_lock_nested+0x2e/0x369
[   32.920011]  [<ffffffff810b8673>] ? lock_release+0x154/0x185
[   32.920011]  [<ffffffff810b61fb>] ? trace_hardirqs_off+0xd/0xf
[   32.920011]  [<ffffffff814b4e43>] _object_find+0x25/0x6c
[   32.920011]  [<ffffffff814b55f3>] drm_mode_object_find+0x38/0x53
[   32.920011]  [<ffffffff815943e0>] cirrus_connector_best_encoder+0x21/0x2f
[   32.920011]  [<ffffffff814a56f2>] drm_crtc_helper_set_config+0x38c/0x83c
[   32.920011]  [<ffffffff814b6fb4>] drm_mode_set_config_internal+0x53/0xca
[   32.920011]  [<ffffffff814a768f>] restore_fbdev_mode+0x91/0xad
[   32.920011]  [<ffffffff814a7853>] drm_fb_helper_panic+0x69/0xab
[   32.920011]  [<ffffffff810ab948>] notifier_call_chain+0x61/0x8b
[   32.920011]  [<ffffffff810aba6b>] __atomic_notifier_call_chain+0x7e/0xe6
[   32.920011]  [<ffffffff810abae2>] atomic_notifier_call_chain+0xf/0x11
[   32.920011]  [<ffffffff81ff1997>] panic+0xf0/0x1fb
[   32.920011]  [<ffffffff81093b3c>] do_exit+0x3dd/0x80f
[   32.920011]  [<ffffffff810b0739>] ? local_clock+0x14/0x1d
[   32.920011]  [<ffffffff8109400f>] do_group_exit+0x75/0xb4
[   32.920011]  [<ffffffff8109c803>] get_signal_to_deliver+0x48a/0x4aa
[   32.920011]  [<ffffffff8100231a>] do_signal+0x43/0x5ba
[   32.920011]  [<ffffffff810b4b95>] ? lock_release_holdtime+0x6c/0x77
[   32.920011]  [<ffffffff810b83d1>] ? lock_release_non_nested+0xd0/0x21e
[   32.920011]  [<ffffffff810b0662>] ? sched_clock_cpu+0x4e/0x62
[   32.920011]  [<ffffffff810fd43f>] ? might_fault+0x4f/0x9c
[   32.920011]  [<ffffffff810b617f>] ? trace_hardirqs_off_caller+0x36/0xa5
[   32.920011]  [<ffffffff820048d8>] ? retint_signal+0x11/0x99
[   32.920011]  [<ffffffff810028b5>] do_notify_resume+0x24/0x53
[   32.920011]  [<ffffffff82004914>] retint_signal+0x4d/0x99
[   32.920011] Rebooting in 10 seconds..
> >
> >> Is there an easy way to see exactly what was tested?
> >
> > This script may reproduce the error. Note that it's not 100% reproducible.
> 
> It fails with:
> 
> [    1.214573] VFS: Cannot open root device "ram0" or
> unknown-block(0,0): error -6
> [    1.216567] Please append a correct "root=" boot option; here are
> the available partitions:
> [    1.218692] 0b00         1048575 sr0  driver: sr

Oops, github needs this link for downloading big files:

https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/yocto-minimal-i386.cgz

Thanks,
Fengguang

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