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



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

    x86_64,vsyscall: Make vsyscall emulation configurable
    
    This adds CONFIG_X86_VSYSCALL_EMULATION, guarded by CONFIG_EXPERT.
    Turning it off completely disables vsyscall emulation, saving ~3.5k
    for vsyscall_64.c, 4k for vsyscall_emu_64.S (the fake vsyscall
    page), some tiny amount of core mm code that supports a gate area,
    and possibly 4k for a wasted pagetable.  The latter is because the
    vsyscall addresses are misaligned and fit poorly in the fixmap.
    
    Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>

===================================================
PARENT COMMIT NOT CLEAN. LOOK OUT FOR WRONG BISECT!
===================================================
Attached dmesg for the parent commit, too, to help confirm whether it is a 
noise error.

+-----------------------------------------------------------+------------+------------+------------------+
|                                                           | e1656ab2ad | 
442aba0c61 | v3.16-rc4_071018 |
+-----------------------------------------------------------+------------+------------+------------------+
| boot_successes                                            | 1160       | 99   
      | 3                |
| boot_failures                                             | 160        | 231  
      | 8                |
| BUG:kernel_boot_hang                                      | 160        | 51   
      | 2                |
| Kernel_panic-not_syncing:Attempted_to_kill_init_exitcode= | 0          | 180  
      | 6                |
| INFO:suspicious_RCU_usage                                 | 0          | 180  
      | 6                |
+-----------------------------------------------------------+------------+------------+------------------+

mount: can't read '/proc/mounts': No such file or directory
[   33.736413] init[1]: segfault at ffffffffff600400 ip ffffffffff600400 sp 
00007fff2894a8a8 error 15
[   33.737608] init[1]: segfault at ffffffffff600400 ip ffffffffff600400 sp 
00007fff28949eb8 error 15
[   33.739046] Kernel panic - not syncing: Attempted to kill init! 
exitcode=0x0000000b
[   33.739046] 
[   33.740015] CPU: 0 PID: 1 Comm: init Not tainted 3.16.0-rc3-00010-g442aba0 #4
[   33.740015]  0000000000000000 ffff880000033cc0 ffffffff81ff485f 
ffff880000033d38
[   33.740015]  ffffffff81ff1342 ffff880000000010 ffff880000033d48 
ffff880000033ce8
[   33.740015]  ffffffff82c440c0 000000000000000b 8c6318c6318c6320 
00000007db00a678
[   33.740015] Call Trace:
[   33.740015]  [<ffffffff81ff485f>] dump_stack+0x19/0x1b
[   33.740015]  [<ffffffff81ff1342>] panic+0xcb/0x1fb
[   33.740015]  [<ffffffff81093b2f>] do_exit+0x3dd/0x80f
[   33.740015]  [<ffffffff810b071d>] ? local_clock+0x14/0x1d
[   33.740015]  [<ffffffff81094002>] do_group_exit+0x75/0xb4
[   33.740015]  [<ffffffff8109c7e7>] get_signal_to_deliver+0x48a/0x4aa
[   33.740015]  [<ffffffff8100231a>] do_signal+0x43/0x5ba
[   33.740015]  [<ffffffff810b4b79>] ? lock_release_holdtime+0x6c/0x77
[   33.740015]  [<ffffffff810b83b5>] ? lock_release_non_nested+0xd0/0x21e
[   33.740015]  [<ffffffff810b0646>] ? sched_clock_cpu+0x4e/0x62
[   33.740015]  [<ffffffff810fd465>] ? might_fault+0x4f/0x9c
[   33.740015]  [<ffffffff810b6163>] ? trace_hardirqs_off_caller+0x36/0xa5
[   33.740015]  [<ffffffff82004298>] ? retint_signal+0x11/0x99
[   33.740015]  [<ffffffff810028b5>] do_notify_resume+0x24/0x53
[   33.740015]  [<ffffffff820042d4>] retint_signal+0x4d/0x99
[   33.740015] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 
0xffffffff80000000-0xffffffff9fffffff)
[   33.740015] drm_kms_helper: panic occurred, switching back to text console
[   33.740015] 
[   33.740015] ===============================
[   33.740015] [ INFO: suspicious RCU usage. ]
[   33.740015] 3.16.0-rc3-00010-g442aba0 #4 Not tainted
[   33.740015] -------------------------------
[   33.740015] include/linux/rcupdate.h:539 Illegal context switch in RCU 
read-side critical section!
[   33.740015] 
[   33.740015] other info that might help us debug this:
[   33.740015] 
[   33.740015] 
[   33.740015] rcu_scheduler_active = 1, debug_locks = 0
[   33.740015] 3 locks held by init/1:
[   33.740015]  #0:  (panic_lock){....+.}, at: [<ffffffff81ff12ba>] 
panic+0x43/0x1fb
[   33.740015]  #1:  (rcu_read_lock){......}, at: [<ffffffff810ab879>] 
rcu_lock_acquire+0x0/0x23
[   33.740015]  #2:  (&dev->mode_config.mutex){+.+.+.}, at: 
[<ffffffff814a74d7>] drm_fb_helper_panic+0x5d/0xab
[   33.740015] 
[   33.740015] stack backtrace:
[   33.740015] CPU: 0 PID: 1 Comm: init Not tainted 3.16.0-rc3-00010-g442aba0 #4
[   33.740015]  0000000000000000 ffff8800000339d0 ffffffff81ff485f 
ffff880000033a00
[   33.740015]  ffffffff810b8824 ffffffff82836248 000000000000024a 
0000000000000000
[   33.740015]  ffff88001012e008 ffff880000033a10 ffffffff810adce3 
ffff880000033a38
[   33.740015] Call Trace:
[   33.740015]  [<ffffffff81ff485f>] dump_stack+0x19/0x1b
[   33.740015]  [<ffffffff810b8824>] lockdep_rcu_suspicious+0xf6/0xff
[   33.740015]  [<ffffffff810adce3>] rcu_preempt_sleep_check+0x45/0x47
[   33.740015]  [<ffffffff810afedf>] __might_sleep+0x17/0x19a
[   33.740015]  [<ffffffff8200019e>] mutex_lock_nested+0x2e/0x369
[   33.740015]  [<ffffffff810b8657>] ? lock_release+0x154/0x185
[   33.740015]  [<ffffffff810b61df>] ? trace_hardirqs_off+0xd/0xf
[   33.740015]  [<ffffffff814b4ad3>] _object_find+0x25/0x6c
[   33.740015]  [<ffffffff814b5283>] drm_mode_object_find+0x38/0x53
[   33.740015]  [<ffffffff81593f6e>] cirrus_connector_best_encoder+0x21/0x2f
[   33.740015]  [<ffffffff814a5382>] drm_crtc_helper_set_config+0x38c/0x83c
[   33.740015]  [<ffffffff814b6c44>] drm_mode_set_config_internal+0x53/0xca
[   33.740015]  [<ffffffff814a731f>] restore_fbdev_mode+0x91/0xad
[   33.740015]  [<ffffffff814a74e3>] drm_fb_helper_panic+0x69/0xab
[   33.740015]  [<ffffffff810ab92c>] notifier_call_chain+0x61/0x8b
[   33.740015]  [<ffffffff810aba4f>] __atomic_notifier_call_chain+0x7e/0xe6
[   33.740015]  [<ffffffff810abac6>] atomic_notifier_call_chain+0xf/0x11
[   33.740015]  [<ffffffff81ff1367>] panic+0xf0/0x1fb
[   33.740015]  [<ffffffff81093b2f>] do_exit+0x3dd/0x80f
[   33.740015]  [<ffffffff810b071d>] ? local_clock+0x14/0x1d
[   33.740015]  [<ffffffff81094002>] do_group_exit+0x75/0xb4
[   33.740015]  [<ffffffff8109c7e7>] get_signal_to_deliver+0x48a/0x4aa
[   33.740015]  [<ffffffff8100231a>] do_signal+0x43/0x5ba
[   33.740015]  [<ffffffff810b4b79>] ? lock_release_holdtime+0x6c/0x77
[   33.740015]  [<ffffffff810b83b5>] ? lock_release_non_nested+0xd0/0x21e
[   33.740015]  [<ffffffff810b0646>] ? sched_clock_cpu+0x4e/0x62
[   33.740015]  [<ffffffff810fd465>] ? might_fault+0x4f/0x9c
[   33.740015]  [<ffffffff810b6163>] ? trace_hardirqs_off_caller+0x36/0xa5
[   33.740015]  [<ffffffff82004298>] ? retint_signal+0x11/0x99
[   33.740015]  [<ffffffff810028b5>] do_notify_resume+0x24/0x53
[   33.740015]  [<ffffffff820042d4>] retint_signal+0x4d/0x99
[   33.740015] Rebooting in 10 seconds..
Elapsed time: 40
qemu-system-x86_64 -cpu kvm64 -enable-kvm -kernel 
/kernel/x86_64-randconfig-hsxa0-07110255/442aba0c6131f0c41dfc5edb6bfb88335556523f/vmlinuz-3.16.0-rc3-00010-g442aba0
 -append 'hung_task_panic=1 earlyprintk=ttyS0,115200 debug apic=debug 
sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=10 
softlockup_panic=1 nmi_watchdog=panic  prompt_ramdisk=0 console=ttyS0,115200 
console=tty0 vga=normal  root=/dev/ram0 rw 
link=/kbuild-tests/run-queue/kvm/x86_64-randconfig-hsxa0-07110255/linux-devel:devel-hourly-2014071018:442aba0c6131f0c41dfc5edb6bfb88335556523f:bisect-linux9/.vmlinuz-442aba0c6131f0c41dfc5edb6bfb88335556523f-20140711073043-10-ivb41
 branch=linux-devel/devel-hourly-2014071018 
BOOT_IMAGE=/kernel/x86_64-randconfig-hsxa0-07110255/442aba0c6131f0c41dfc5edb6bfb88335556523f/vmlinuz-3.16.0-rc3-00010-g442aba0
 drbd.minor_count=8'  -initrd /kernel-tests/initrd/yocto-minimal-x86_64.cgz -m 
320 -smp 1 -net nic,vlan=1,model=e1000 -net user,vlan=1 -boot order=nc 
-no-reboot -watchdog i6300esb -rtc base=localtime -pidfile 
/dev/shm/kboot/pid-yocto-ivb41-17 -serial 
file:/dev/shm/kboot/serial-yocto-ivb41-17 -daemonize -display none -monitor 
null 

git bisect start c80be3ae11770011071103d3e920864c275472a8 
cd3de83f147601356395b57a8673e9c5ff1e59d1 --
git bisect  bad 6e36d433610a3ebfdef000f1fb283e3f218a8a32  # 20:54      0-     
19  Merge 'omap/omap-for-v3.16/fixes' into devel-hourly-2014071018
git bisect  bad 14604ab36faba88a89cb2c9611509f5a1c1cac21  # 20:54      0-    
222  Merge 'ulf.hansson-mmc/next' into devel-hourly-2014071018
git bisect good 9141a68d71aa193f78aac5306fc728fba8fb59f4  # 21:50    330+     
94  Merge 'm68k/for-linus' into devel-hourly-2014071018
git bisect  bad 13987d1746951b727146fef187406b7be00a3fd0  # 22:12      0-      
7  Merge 'luto/x86/vsyscall' into devel-hourly-2014071018
git bisect good 7104a2e08de8bddb52d4714fad63d8a7977ea7f2  # 23:19    330+     
22  x86_64: Move getcpu code from vsyscall_64.c to vdso/vma.c
git bisect good e1656ab2adfd1891f62610abe3e85ad992ee0cbf  # 23:26    330+    
113  arm64,ia64,ppc,s390,sh,tile,um,x86,mm: Remove default gate area
git bisect  bad 465c34985bb9823bb4536eb6751197f2d295ca32  # 23:29     54-     
91  x86,vdso: Set VM_MAYREAD for the vvar vma
git bisect  bad 442aba0c6131f0c41dfc5edb6bfb88335556523f  # 23:31      0-     
37  x86_64,vsyscall: Make vsyscall emulation configurable
# first bad commit: [442aba0c6131f0c41dfc5edb6bfb88335556523f] x86_64,vsyscall: 
Make vsyscall emulation configurable
git bisect good e1656ab2adfd1891f62610abe3e85ad992ee0cbf  # 12:09    990+    
160  arm64,ia64,ppc,s390,sh,tile,um,x86,mm: Remove default gate area
git bisect  bad c80be3ae11770011071103d3e920864c275472a8  # 12:10      0-      
8  0day head guard for 'devel-hourly-2014071018'
git bisect good 85d90faed31ec74fb28a450fbc368d982a785924  # 13:11    990+    
518  Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
git bisect good 47cf0ce945c8310228ff2d4bd756e5313f4659c1  # 13:21    990+    
418  Add linux-next specific files for 20140710



Thanks,
Fengguang

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Attachment: x86_64-randconfig-hsxa0-07110255-c80be3ae11770011071103d3e920864c275472a8-Kernel-panic---not-syncing:-Attempted-to-kill----exitcode--114769.log
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Attachment: config-3.16.0-rc3-00010-g442aba0
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