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

[Andy Lutomirski]

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?  Is there an easy way to see exactly what was
tested?  I had a buggy commit called "x86: Split syscall_trace_enter
into two phases" that could have caused this problem.
3f649f5658a163645e3ce15156176c325283762e was bad, but
714cf438762d342673b3b131d5c90bc69ca921a9 (the newer version of that
commit) should be okay.  Neither is an ancestor of the commit that the
bisect identified, though.

Thanks,
Andy

>
>     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
>
> _______________________________________________
> LKP mailing list
> LKP@xxxxxxxxxxxxxxx
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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