RE: [x86] BUG: unable to handle kernel paging request at ffff880012770000

From: Artem Fetishev
Date: Mon Aug 04 2014 - 08:21:28 EST

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Are we talking about error in rapl_pmu_init()? I ran your script on v3.14 and the error (in rapl_pmu_init) did not appear. Once again, for 3.14-rc8 the error does show up. My patch was merged between v3.14-rc8 and v3.14. The purpose of the patch was fixing that GPF in rapl_pmu_init. So I doubt the bisect is correct.

-----Original Message-----
From: Artem Fetishev
Sent: Thursday, July 31, 2014 9:42 AM
To: 'Fengguang Wu'
Cc: Jet Chen; Su Tao; Yuanhan Liu; LKP; linux-kernel@xxxxxxxxxxxxxxx
Subject: RE: [x86] BUG: unable to handle kernel paging request at ffff880012770000

Hi Fengguang,

Reproduced with your config and script. Working on locating the cause...

Thanks,
-Artem

-----Original Message-----
From: Fengguang Wu [mailto:fengguang.wu@xxxxxxxxx]
Sent: Wednesday, July 30, 2014 7:08 AM
To: Artem Fetishev
Cc: Jet Chen; Su Tao; Yuanhan Liu; LKP; linux-kernel@xxxxxxxxxxxxxxx
Subject: [x86] BUG: unable to handle kernel paging request at ffff880012770000

Hi Artem,

FYI, this bisect has noise errors, so I'm not sure if it's a correct bisect.

git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit 825600c0f20e595daaa7a6dd8970f84fa2a2ee57
Author: Artem Fetishev <artem_fetishev@xxxxxxxx>
AuthorDate: Fri Mar 28 13:33:39 2014 -0700
Commit: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
CommitDate: Fri Mar 28 13:56:58 2014 -0700

x86: fix boot on uniprocessor systems

On x86 uniprocessor systems topology_physical_package_id() returns -1
which causes rapl_cpu_prepare() to leave rapl_pmu variable uninitialized
which leads to GPF in rapl_pmu_init().

See arch/x86/kernel/cpu/perf_event_intel_rapl.c.

It turns out that physical_package_id and core_id can actually be
retreived for uniprocessor systems too. Enabling them also fixes
rapl_pmu code.

Signed-off-by: Artem Fetishev <artem_fetishev@xxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

===================================================
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.

+-----------------------------------------------------------+------------+------------+---------------+
| | d9060742fb | 825600c0f2 | next-20140723 |
+-----------------------------------------------------------+------------+------------+---------------+
| boot_successes | 167 | 48 | 9 |
| boot_failures | 97 | 18 | 2 |
| BUG:unable_to_handle_kernel_NULL_pointer_dereference | 97 | 14 | 2 |
| Oops | 97 | 3 | 2 |
| RIP:rapl_pmu_init | 97 | | |
| Kernel_panic-not_syncing:Attempted_to_kill_init_exitcode= | 97 | | |
| backtrace:rapl_pmu_init | 97 | | |
| backtrace:kernel_init_freeable | 97 | 3 | |
| BUG:unable_to_handle_kernel_paging_request | 0 | 17 | 2 |
| BUG:unable_to_handle_kernel_NULL_pointer | 0 | 1 | |
| RIP:slob_page_alloc | 0 | 3 | |
| backtrace:proc_create_data | 0 | 3 | |
| backtrace:init_timer_list_procfs | 0 | 3 | |
| BUG:unable_to_handle | 0 | 1 | |
| BUG:unable_to_handl | 0 | 1 | |
| BUG:unable_to_handle_ker | 0 | 1 | |
| BUG:kernel_boot_hang | 0 | 1 | |
| RIP:memset | 0 | 0 | 2 |
| RIP:__rmqueue | 0 | 0 | 2 |
| backtrace:cryptomgr_test | 0 | 0 | 2 |
| backtrace:do_fork | 0 | 0 | 2 |
+-----------------------------------------------------------+------------+------------+---------------+

[ 1.026545] cryptomgr_test (20) used greatest stack depth: 5632 bytes left
[ 1.030491] AVX version of gcm_enc/dec engaged.
[ 1.033812] alg: No test for __gcm-aes-aesni (__driver-gcm-aes-aesni)
[ 1.038806] BUG: unable to handle kernel paging request at ffff880012770000
[ 1.040058] IP: [<ffffffff8161d18f>] memset+0x1f/0xb0
[ 1.040058] PGD 4170067 PUD 4171067 PMD 13bee067 PTE 8000000012770060
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] BUG: unable to handle kernel paging request at ffff880012776440
[ 1.040058] IP: [<ffffffff810fb846>] match_held_lock+0x16/0x2f0
[ 1.040058] PGD 4170067 PUD 4171067 PMD 13bee067 PTE 8000000012776060
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000072
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a
[ 1.040058] IP: [<ffffffff820d66f6>] no_context+0x34e/0x3f4
[ 1.040058] PGD 0
[ 1.040058] BUG: unable to handle kernel NULL pointer dereference at 000000000000006a

git bisect start v3.14 v3.13 --
git bisect good 494479038d97f1b9f76fc633a360a681acdf035c # 20:32 66+ 28 Merge tag 'pinctrl-v3.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
git bisect good 751a03c3728ed393287374078b98c3094a0b3bd2 # 20:36 66+ 67 Merge tag 'pm+acpi-3.14-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
git bisect good 18f2af2d68815e1c4d5c275ebd030e27ef627582 # 20:43 66+ 55 Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
git bisect good 708f04d2abf4e90abee61d9ffb1f165038017ecf # 20:46 66+ 58 block: free q->flush_rq in blk_init_allocated_queue error paths
git bisect good 75c5a52da3fc2a06abb6c6192bdf5d680e56d37d # 20:48 66+ 31 vfs: Allocate anon_inode_inode in anon_inode_init()
git bisect bad 0f2776e6151a123552fd06b666fe755fa780a967 # 20:48 0- 18 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client
git bisect good 1fac1fa965a9fbdb38d8a4b945db3521f801c946 # 20:57 66+ 26 Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
git bisect bad bc53267e97e4942e7f22c31cd8cf87840796accb # 21:01 1- 5 Merge branch 'akpm' (patches from Andrew Morton)
git bisect good 2946369ee277fa9fcc3372aabddc9c15dfabf744 # 21:11 66+ 0 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
git bisect bad 825600c0f20e595daaa7a6dd8970f84fa2a2ee57 # 21:30 0- 7 x86: fix boot on uniprocessor systems
git bisect good d9060742fbf630fe31951dfc10b798deb2813f01 # 22:39 66+ 29 ocfs2: check if cluster name exists before deref
# first bad commit: [825600c0f20e595daaa7a6dd8970f84fa2a2ee57] x86: fix boot on uniprocessor systems
git bisect good d9060742fbf630fe31951dfc10b798deb2813f01 # 22:49 198+ 97 ocfs2: check if cluster name exists before deref
git bisect bad 5eb00b037d9bb650b18b8f331bb9fb7a66559b5f # 22:51 0- 2 Add linux-next specific files for 20140723
git bisect bad 82e13c71bc655b6dc7110da4e164079dadb44892 # 23:12 0- 77 Merge branch 'for-3.16' of git://linux-nfs.org/~bfields/linux
git bisect bad 1a58d9909611972fd1c081bb04a9f7dc2571e612 # 23:23 2- 1 Add linux-next specific files for 20140724

This script may reproduce the error.

----------------------------------------------------------------------------
#!/bin/bash

kernel=$1
initrd=yocto-minimal-x86_64.cgz

wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/blob/master/initrd/$initrd

kvm=(
qemu-system-x86_64
-enable-kvm
-cpu Haswell,+smep,+smap
-kernel $kernel
-initrd $initrd
-m 320
-smp 1
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)

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
drbd.minor_count=8
)

"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------

Thanks,
Fengguang
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