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Message #24223
[Bug 1743529] Re: Merge kexec-tools 2.0.16-1 from Debian: System hung with Kernel panic -not syncing: Out of memory message when crash is triggered.
** Changed in: ubuntu-power-systems
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1743529
Title:
Merge kexec-tools 2.0.16-1 from Debian: System hung with Kernel panic
-not syncing: Out of memory message when crash is triggered.
Status in The Ubuntu-power-systems project:
Fix Released
Status in kexec-tools package in Ubuntu:
Fix Released
Status in kexec-tools source package in Xenial:
Fix Released
Status in kexec-tools source package in Artful:
Fix Released
Status in kexec-tools source package in Bionic:
Fix Released
Bug description:
[Impact]
Latest kexec-tools is needed to load/kexec recent kernels. For older releases, like xenial, it's needed to support linux-hwe kernels.
[Regression Potential]
It might fail to load the GA kernels, like a 4.4 kernel on xenial.
[Test case]
Different kernels on different architectures have been tested.
== Comment: #0 - INDIRA P. JOGA
Problem Description:
===================
System hung with kernel panic Kernel panic - not syncing: Out of memory message when crash is triggered
Steps to re-create:
==================
> Installed ubuntu1804 daily build on Witherspoon test system
root@whip:~# uname -a
Linux whip 4.13.0-17-generic #20-Ubuntu SMP Mon Nov 6 10:03:08 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
root@whip:~# uname -r
4.13.0-17-generic
> root@whip:~# free -h
total used free shared buff/cache available
Mem: 507G 2.0G 504G 19M 728M 503G
Swap: 2.0G 0B 2.0G
> Edited the grub /etc/default/grub.d/kexec-tools.cfg file and set the
crash kernel parameter=4096M
> Updated grub using update-grub command and reboot system.
cat root@whip:~# cat /proc/cmdline
root=UUID=46c6aa02-8215-44cc-b3fc-0bc79c3c8815 ro splash quiet crashkernel=4096M
> kdump status before triggering crash
root@whip:~# kdump-config show
DUMP_MODE: kdump
USE_KDUMP: 1
KDUMP_SYSCTL: kernel.panic_on_oops=1
KDUMP_COREDIR: /var/crash
crashkernel addr:
/var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinux-4.13.0-17-generic
kdump initrd:
/var/lib/kdump/initrd.img: symbolic link to /var/lib/kdump/initrd.img-4.13.0-17-generic
current state: ready to kdump
kexec command:
/sbin/kexec -p --command-line="root=UUID=46c6aa02-8215-44cc-b3fc-0bc79c3c8815 ro splash quiet irqpoll noirqdistrib nr_cpus=1 nousb systemd.unit=kdump-tools.service ata_piix.prefer_ms_hyperv=0" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz
root@whip:~# kdump-config status
current state : ready to kdump
> Enabled sysrq
root@whip:~# sysctl -w kernel.sysrq=1
kernel.sysrq = 1
> Triggered crash and it hangs with kernel panic- OOM message as below
root@whip:~# echo c > /proc/sysrq-trigger
[ 85.731415] sysrq: SysRq : Trigger a crash
[ 85.731472] Unable to handle kernel paging request for data at address 0x00000000
[ 85.731584] Faulting instruction address: 0xc00000000078f588
[ 85.731670] Oops: Kernel access of bad area, sig: 11 [#1]
[ 85.731744] SMP NR_CPUS=2048
[ 85.731745] NUMA
[ 85.731790] PowerNV
[ 85.731853] Modules linked in: rpcsec_gss_krb5 nfsv4 nfs fscache sctp_diag sctp dccp_diag dccp tcp_diag udp_diag raw_diag inet_diag unix_diag af_packet_diag netlink_diag binfmt_misc vmx_crypto crct10dif_vpmsum ofpart cmdlinepart idt_89hpesx powernv_flash ipmi_powernv opal_prd ibmpowernv mtd ipmi_devintf ipmi_msghandler at24 uio_pdrv_genirq uio dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua nfsd auth_rpcgss sch_fq_codel nfs_acl lockd grace sunrpc ip_tables x_tables autofs4 btrfs xor raid6_pq nouveau bnx2x ast i2c_algo_bit ttm drm_kms_helper mdio libcrc32c crc32c_vpmsum mlx5_core syscopyarea sysfillrect sysimgblt fb_sys_fops tg3 drm ahci mlxfw libahci nvme devlink nvme_core
[ 85.732704] CPU: 10 PID: 4316 Comm: bash Not tainted 4.13.0-17-generic #20-Ubuntu
[ 85.732764] task: c000003fcb141700 task.stack: c000003fc2374000
[ 85.732858] NIP: c00000000078f588 LR: c0000000007904b8 CTR: c00000000078f560
[ 85.732977] REGS: c000003fc23779f0 TRAP: 0300 Not tainted (4.13.0-17-generic)
[ 85.733066] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE>
[ 85.733075] CR: 28422222 XER: 20040000
[ 85.733201] CFAR: c0000000007904b4 DAR: 0000000000000000 DSISR: 42000000 SOFTE: 1
[ 85.733201] GPR00: c0000000007904b8 c000003fc2377c70 c0000000015f6000 0000000000000063
[ 85.733201] GPR04: c000003feedfade8 c000003feee12068 9000000000009033 000000000000000a
[ 85.733201] GPR08: 0000000000000007 0000000000000001 0000000000000000 9000000000001003
[ 85.733201] GPR12: c00000000078f560 c000000007a66900 0000000010180df8 0000000010189e30
[ 85.733201] GPR16: 0000000010189ea8 0000000010151210 000000001018bd58 000000001018de48
[ 85.733201] GPR20: 00000000321168d8 0000000000000001 0000000010164590 0000000010163bb0
[ 85.733201] GPR24: 00007fffcfa6e7d4 00007fffcfa6e7d0 c0000000014fa570 0000000000000002
[ 85.733201] GPR28: 0000000000000063 0000000000000004 c0000000014822f4 c0000000014fa910
[ 85.734116] NIP [c00000000078f588] sysrq_handle_crash+0x28/0x30
[ 85.734211] LR [c0000000007904b8] __handle_sysrq+0xf8/0x2b0
[ 85.734285] Call Trace:
[ 85.734316] [c000003fc2377c70] [c000000000790498] __handle_sysrq+0xd8/0x2b0 (unreliable)
[ 85.734418] [c000003fc2377d10] [c000000000790cb4] write_sysrq_trigger+0x64/0x90
[ 85.734541] [c000003fc2377d40] [c00000000044c0c8] proc_reg_write+0x88/0xd0
[ 85.734656] [c000003fc2377d70] [c00000000039db8c] __vfs_write+0x3c/0x70
[ 85.734741] [c000003fc2377d90] [c00000000039f7c8] vfs_write+0xd8/0x220
[ 85.734845] [c000003fc2377de0] [c0000000003a1648] SyS_write+0x68/0x110
[ 85.734959] [c000003fc2377e30] [c00000000000b184] system_call+0x58/0x6c
[ 85.735053] Instruction dump:
[ 85.735102] 4bfff9f1 4bfffe50 3c4c00e6 38426aa0 7c0802a6 60000000 39200001 3d42001d
[ 85.735209] 394ad788 912a0000 7c0004ac 39400000 <992a0000> 4e800020 3c4c00e6 38426a70
[ 85.735319] ---[ end trace 711a5d30c86f0359 ]---
[ 86.742408]
[ 86.742572] Sending IPI to o[ 184.508956788,5] OPAL: Switch to big-endian OS
ther CPUs
[ 86.743959] IPI[ 187.269699704,5] OPAL: Switch to little-endian OS
complete
[ 86.749730] kexec: waiting for cpu 16 (physical 16) to enter OPAL
[ 88.909562] kexec: Starting switchover sequence.
[ 0.000000] OF: reserved mem: not enough space all defined regions.
[ 0.000000] OF: reserved mem: not enough space all defined regions.
[ 0.000000] OF: reserved mem: not enough space all defined regions.
[ 0.000000] OF: reserved mem: not enough space all defined regions.
-> smp_release_cpus()
spinning_secondaries = 159
<- smp_release_cpus()
[ 1.433082] Unable to open file: /etc/keys/x509_ima.der (-2)
[ 1.433086] Unable to open file: /etc/keys/x509_evm.der (-2)
[ 1.500890] vio vio: uevent: failed to send synthetic uevent
[ 1.670523] nouveau 0004:04:00.0: unknown chipset (140000a1)
[ 1.670632] nouveau 0004:05:00.0: unknown chipset (140000a1)
[ 1.670768] nouveau 0035:03:00.0: unknown chipset (140000a1)
[ 1.670872] nouveau 0035:04:00.0: unknown chipset (140000a1)
/dev/nvme0n1p2: recovering journal
/dev/nvme0n1p2: clean, 81988/25001984 files, 3168955/99997696 blocks
[ 4.042999] vio vio: uevent: failed to send synthetic uevent
. . . .[ 8.856941] Kernel panic - not syncing: Out of memory and no killable processes...
[ 8.856941]
[ 8.857009] CPU: 0 PID: 175 Comm: kworker/u8:5 Tainted: G W 4.13.0-17-generic #20-Ubuntu
[ 8.857131] Workqueue: mkey_cache cache_work_func [mlx5_ib]
[ 8.857188] Call Trace:
[ 8.857215] [c0000000ea90b4f0] [c000000008c5365c] dump_stack+0xb0/0xf4 (unreliable)
[ 8.857297] [c0000000ea90b530] [c0000000080f9e2c] panic+0x144/0x338
[ 8.857381] [c0000000ea90b5c0] [c0000000082bf530] out_of_memory+0x3e0/0x6f0
[ 8.857456] [c0000000ea90b660] [c0000000082c71a8] __alloc_pages_nodemask+0xfe8/0x1080
[ 8.857568] [c0000000ea90b860] [c00000000834d2b0] alloc_pages_current+0xa0/0x140
[ 8.857658] [c0000000ea90b8a0] [c00000000835c834] new_slab+0x3d4/0x810
[ 8.857752] [c0000000ea90b970] [c00000000835e96c] ___slab_alloc+0x3fc/0x7a0
[ 8.857826] [c0000000ea90baa0] [c00000000835ed44] __slab_alloc+0x34/0x60
[ 8.857901] [c0000000ea90bad0] [c00000000835f1a4] kmem_cache_alloc_trace+0x124/0x300
[ 8.857977] [c0000000ea90bb30] [c0080000033863e4] add_keys+0x5c/0x3a0 [mlx5_ib]
[ 8.858083] [c0000000ea90bc20] [c008000003386d84] __cache_work_func+0x12c/0x2b0 [mlx5_ib]
[ 8.858199] [c0000000ea90bca0] [c000000008120a58] process_one_work+0x298/0x5a0
[ 8.858299] [c0000000ea90bd30] [c000000008120de8] worker_thread+0x88/0x620
[ 8.858383] [c0000000ea90bdc0] [c000000008129c5c] kthread+0x1ac/0x1c0
[ 8.858476] [c0000000ea90be30] [c00000000800b4e8] ret_from_kernel_thread+0x5c/0x74
[ 9.666011] ---[ end Kernel panic - not syncing: Out of memory and no killable processes...
[ 9.666
> System is available for debugging.
== Comment: #1 - INDIRA P. JOGA
> Tried with default crash kernel parameter
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M and still facing same kernel panic hung issue with the system
root@whip:~# cat /proc/cmdline
root=UUID=46c6aa02-8215-44cc-b3fc-0bc79c3c8815 ro splash quiet crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
> Triggered crash and it hangs
Regards,
Indira
== Comment: #6 - INDIRA P. JOGA
Hi Urvashi,
Tried triggering crash with higher crash kernel parameter like 16384M
and i see issue recreated like it throws similar messages like
"uevent: failed to send synthetic uevent" but it rebooted and hangs
this time while booting.
> Crashkernel parameter
root@whip:~# cat /proc/cmdline
root=UUID=2f422155-c251-4bc1-abd8-47cb17a13e65 ro splash quiet crashkernel=16384M
> Triggered crash
> Attached console logs
Regards,
Indira
== Comment: #8 - INDIRA P. JOGA <indira.priya@xxxxxxxxxx> - 2018-01-03 22:45:02 ==
> kexectools and makeudmp file verisons from test system
kexec-tools/bionic,now 1:2.0.15-0ubuntu1 ppc64el [installed,automatic]
makedumpfile/bionic,now 1:1.6.2-1ubuntu1 ppc64el [installed,automatic]
Regards,
Indira
== Comment: #10 - Hari Krishna Bathini <hbathini@xxxxxxxxxx> - 2018-01-04 04:50:01 ==
(In reply to comment #6)
This is due to checkstop that occurs on systems with GPUs connected.
The below two patches are need to fix this:
commit aec4d0f7a2502a13fc21e90ff32dc306b0ad1190
Author: Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx>
Date: Thu Aug 17 18:01:51 2017 +0530
kexec-tools: ppc64: avoid adding coherent memory regions to crash
memory ranges
Accelerator devices like GPU and FPGA cards contain onboard memory. This
onboard memory is represented as a memory only NUMA node, integrating it
with core memory subsystem. Since, the link through which these devices
are integrated to core memory goes down after a system crash and they are
meant for user workloads, avoid adding coherent device memory regions to
crash memory ranges. Without this change, makedumpfile tool tries to save
unaccessible coherent device memory regions, crashing the system.
Signed-off-by: Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx>
Tested-by: Pingfan Liu <piliu@xxxxxxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
--
commit 69431282f075ab723c4886f20aa248976920aaae
Author: Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx>
Date: Tue Aug 29 23:08:02 2017 +0530
kexec-tools: ppc64: fix leak while checking for coherent device
memory
Signed-off-by: Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
--
Thanks
Hari
== Comment: #11 - Hari Krishna Bathini <hbathini@xxxxxxxxxx> - 2018-01-04 04:52:40 ==
urvashi, also check if the below patches are included in the kexec-tools shipped
with 18.04. If not, they should also be included:
commit 21eb397a5fc9227cd95d23e8c74a49cf6a293e57
Author: Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx>
Date: Wed Aug 9 23:47:42 2017 +0530
kexec-tools: powerpc: fix command line overflow error
Since kernel commit a5980d064fe2 ("powerpc: Bump COMMAND_LINE_SIZE
to 2048"), powerpc bumped command line size to 2048 but the size
used here is still the default value of 512. Bump it to 2048 to
fix command line overflow errors observed when command line length
is above 512 bytes. Also, get rid of the multiple definitions of
COMMAND_LINE_SIZE macro in ppc architecture.
Signed-off-by: Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
--
commit 47478ea66d4301b12a07862aebc8447a2932f0ed
Author: Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx>
Date: Wed Jul 26 22:49:41 2017 +0530
kexec-tools: ppc64: fix how RMA top is deduced
Hang was observed, in purgatory, on a machine configured with
single LPAR. This was because one of the segments was loaded
outside the actual Real Memory Area (RMA) due to wrongly
deduced RMA top value.
Currently, top of real memory area, which is crucial for loading
kexec/kdump kernel, is obtained by iterating through mem nodes
and setting its value based on the base and size values of the
last mem node in the iteration. That can't always be correct as
the order of iteration may not be same and RMA base & size are
always based on the first memory property. Fix this by setting
RMA top value based on the base and size values of the memory
node that has the smallest base value (first memory property)
among all the memory nodes.
Also, correct the misnomers rmo_base and rmo_top to rma_base
and rma_top respectively.
While how RMA top is deduced was broken for sometime, the issue
may not have been seen so far, for couple of possible reasons:
1. Only one mem node was available.
2. First memory property has been the last node in
iteration when multiple mem nodes were present.
Fixes: 02f4088ffded ("kexec fix ppc64 device-tree mem node")
Reported-by: Ankit Kumar <ankit@xxxxxxxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Geoff Levand <geoff@xxxxxxxxxxxxx>
Signed-off-by: Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
--
Thanks
Hari
== Comment:
As discussed with Hari,
commit 21eb397a5fc9227cd95d23e8c74a49cf6a293e57
kexec-tools: powerpc: fix command line overflow error
commit 47478ea66d4301b12a07862aebc8447a2932f0ed
kexec-tools: ppc64: fix how RMA top is deduced
Both the commits are not present in Ubuntu 18.04
Comment 19 Urvashi Jawere
Hi Indira,
Installed updated kexec tools (which includes all the 4 patches) in
the whip system. Please retest and update us with your findings.
== Comment: #20 - INDIRA P. JOGA <indira.priya@xxxxxxxxxx> - 2018-01-10 10:40:06 ==
Hi Urvashi,
I have tried the kdump (triggering crash) test scenario and observed
below findings
-->> For both default and 4096M crash kernel parameters system did not
hang when triggered crash and it booted it up properly but did not
find /var/crash logs saved.
Regards,
Indira
== Comment: #
Hi,
Urvashi/Indira, that is probably because of the below..
>[ 154.241351] Faulting instruction address: 0xc000000000792f88
> [ 154.241447] Oops: Kernel access of bad area, sig: 11 [#1]
> [ 154.241517] SMP NR_CPUS=2048
> [ 154.241518] NUMA
>
The above shows that kdump kernel has failed with OOM.
Can you try using "crashkernel=8192M" and see if dump capture is successful with that?
Thanks
Hari
== Comment: #24 - INDIRA P. JOGA
Hi Hari/Urvashi,
Tried kdump (triggering crash) test scenario with "crashkernel=8192M"
and crash logs are saved as below
> root@whip:~# cat /proc/cmdline
root=UUID=49ed695c-a4dc-4e55-9ca6-319145265826 ro splash quiet crashkernel=8192M
root@whip:~# free -h
total used free shared buff/cache available
Mem: 503G 3.2G 499G 12M 909M 498G
Swap: 2.0G 0B 2.0G
> root@whip:~# kdump-config show
DUMP_MODE: kdump
USE_KDUMP: 1
KDUMP_SYSCTL: kernel.panic_on_oops=1
KDUMP_COREDIR: /var/crash
crashkernel addr:
/var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinux-4.13.0-25-generic
kdump initrd:
/var/lib/kdump/initrd.img: symbolic link to /var/lib/kdump/initrd.img-4.13.0-25-generic
current state: ready to kdump
kexec command:
/sbin/kexec -p --command-line="root=UUID=49ed695c-a4dc-4e55-9ca6-319145265826 ro splash quiet irqpoll noirqdistrib nr_cpus=1 nousb systemd.unit=kdump-tools.service ata_piix.prefer_ms_hyperv=0" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz
> root@whip:~# kdump-config status
current state : ready to kdump
root@whip:~# sysctl -w kernel.sysrq=1
kernel.sysrq = 1
root@whip:~#
> Triggered crash as below
root@whip:~# echo c > /proc/sysrq-trigger
[ 533.615228] sysrq: SysRq : Trigger a crash
[ 533.615288] Unable to handle kernel paging request for data at address 0x00000000
[ 533.615397] Faulting instruction address: 0xc000000000792f88
[ 533.615479] Oops: Kernel access of bad area, sig: 11 [#1]
[ 533.615550] SMP NR_CPUS=2048
[ 533.615551] NUMA
[ 533.615590] PowerNV
[ 533.615657] Modules linked in: rpcsec_gss_krb5 nfsv4 nfs fscache sctp_diag sctp dccp_diag dccp tcp_diag udp_diag raw_diag inet_diag unix_diag af_packet_diag netlink_diag vmx_crypto crct10dif_vpmsum idt_89hpesx ofpart cmdlinepart ipmi_powernv powernv_flash ipmi_devintf ibmpowernv ipmi_msghandler mtd opal_prd at24 uio_pdrv_genirq uio binfmt_misc dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua sch_fq_codel nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables x_tables autofs4 btrfs xor raid6_pq uas usb_storage nouveau bnx2x ast i2c_algo_bit ttm drm_kms_helper mdio libcrc32c mlx5_core crc32c_vpmsum syscopyarea sysfillrect sysimgblt fb_sys_fops tg3 drm ahci libahci mlxfw nvme devlink nvme_core
[ 533.616497] CPU: 10 PID: 4887 Comm: bash Not tainted 4.13.0-25-generic #29-Ubuntu
[ 533.616600] task: c000003fa20ab200 task.stack: c000003fa80d4000
[ 533.616702] NIP: c000000000792f88 LR: c000000000793eb8 CTR: c000000000792f60
[ 533.616795] REGS: c000003fa80d79f0 TRAP: 0300 Not tainted (4.13.0-25-generic)
[ 533.616895] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE>
[ 533.616904] CR: 28422222 XER: 20040000
> Crash logs as below
root@whip:~# ls -lr /var/crash
total 21528
-rw-r----- 1 root root 22002927 Jan 12 04:06 _usr_lpp_htx_bin_hxestorage.0.crash
-rw-r----- 1 root root 28945 Jan 16 01:14 linux-image-4.13.0-25-generic-201801160110.crash
-rw-r--r-- 1 root root 251 Jan 16 01:14 kexec_cmd
drwxr-xr-x 2 root root 4096 Jan 16 01:11 201801160110
root@whip:~# date
Tue Jan 16 01:14:44 CST 2018
Regards,
Indira
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