Message-ID: <564DA363.9060303@linux.vnet.ibm.com>
Date:	Thu, 19 Nov 2015 15:54:35 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Tejun Heo <tj@...nel.org>, axboe@...com, jack@...e.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>, "Theodore Ts'o" <tytso@....edu>
Subject: BUG:  Unable to handle kernel paging request for data at address
 __percpu_counter_add

Hi,

While I was creating thousands of docker container on a power8 baremetal
(config: 4.3.0 kernel 1TB RAM, 20core (=160 cpu) system. After creating 
around 5600 container
I have hit below problem.
[This is looking similar to 
https://bugzilla.kernel.org/show_bug.cgi?id=101011, but
kernel had Revert "ext4: remove block_device_ejected" (bdfe0cbd746aa9) 
since it is 4.3.0 tagged kernel]

Any hints on how to go about the fix. Please let me know if you think 
any more information needed.

docker daemon is device mapper based. (and it took a day to recreate the 
problem)

[ by disabling  CONFIG_BLK_CGROUP and CONFIG_CGROUP_WRITEBACK I am able 
to create 10k containers without any problem]

Nov 14 17:27:00 docker5 kernel: [40161.570029] Unable to handle kernel 
paging request for data at address 0x3fedfa0000
Nov 14 17:27:00 docker5 kernel: [40161.570125] Faulting instruction 
address: 0xc00000000056de90
Nov 14 17:27:00 docker5 kernel: [40161.570136] Oops: Kernel access of 
bad area, sig: 11 [#1]
Nov 14 17:27:00 docker5 kernel: [40161.570143] SMP NR_CPUS=256 NUMA PowerNV
Nov 14 17:27:00 docker5 kernel: [40161.570177] Modules linked in: 
veth(E) xt_nat(E) xt_tcpudp(E) xt_addrtype(E) xt_conntrack(E) 
ipt_MASQUERADE(E) nf_nat_masquerade_ipv4(E) iptable_nat(E) 
nf_conntrack_ipv4(E) nf_defrag_ipv4(E) nf_nat_ipv4(E) iptable_filter(E) 
ip_tables(E) x_tables(E) nf_nat(E) nf_conntrack(E) bridge(E) stp(E) 
llc(E) dm_thin_pool(E) dm_persistent_data(E) dm_bio_prison(E) 
dm_bufio(E) libcrc32c(E) uio_pdrv_genirq(E) powernv_rng(E) uio(E) 
autofs4(E) ses(E) enclosure(E) mlx4_en(E) vxlan(E) ip6_udp_tunnel(E) 
udp_tunnel(E) lpfc(E) mlx4_core(E) scsi_transport_fc(E) ipr(E)
Nov 14 17:27:00 docker5 kernel: [40161.570755] CPU: 154 PID: 77177 Comm: 
docker Tainted: G            E   4.3.0+ #34
Nov 14 17:27:00 docker5 kernel: [40161.570830] task: c00000eaec7f2780 
ti: c00000eaa4ac0000 task.ti: c00000eaa4ac0000
Nov 14 17:27:00 docker5 kernel: [40161.570904] NIP: c00000000056de90 LR: 
c0000000002273e0 CTR: 0000000000000000
Nov 14 17:27:00 docker5 kernel: [40161.570978] REGS: c00000eaa4ac3530 
TRAP: 0300   Tainted: G            E    (4.3.0+)
Nov 14 17:27:00 docker5 kernel: [40161.571051] MSR: 9000000100009033 
<SF,HV,EE,ME,IR,DR,RI,LE>  CR: 28028428  XER: 20000000
Nov 14 17:27:00 docker5 kernel: [40161.571244] CFAR: c000000000008468 
DAR: 0000003fedfa0000 DSISR: 40000000 SOFTE: 0
Nov 14 17:27:00 docker5 kernel: [40161.571244] GPR00: c0000000002273e0 
c00000eaa4ac37b0 c0000000014d6c00 c00000f1f7603fb8
Nov 14 17:27:00 docker5 kernel: [40161.571244] GPR04: 0000000000000001 
0000000000000040 0000000000000001 0000000000000001
Nov 14 17:27:00 docker5 kernel: [40161.571244] GPR08: 000000000000007d 
0000000000000000 0000003fedfa0000 0000003fedfa0000
Nov 14 17:27:00 docker5 kernel: [40161.571244] GPR12: c0000000003a4700 
c000000007fbb700 c000000000cff0f8 0000000000000000
Nov 14 17:27:00 docker5 kernel: [40161.571244] GPR16: c00000e790430400 
0000000000000000 0000000000000000 c00000e7a7e1a000
Nov 14 17:27:00 docker5 kernel: [40161.571244] GPR20: c00000e7c9d16800 
0000000000000000 c00000000176cfc4 0000000000000001
Nov 14 17:27:00 docker5 kernel: [40161.571244] GPR24: 000000000009eca9 
0000000000000001 0000000000000000 c00000ffcf8cb800
Nov 14 17:27:00 docker5 kernel: [40161.571244] GPR28: c00000f21a739af0 
0000000000000001 c000000001505414 c00000f1f7603fb8
Nov 14 17:27:00 docker5 kernel: [40161.572243] NIP [c00000000056de90] 
__percpu_counter_add+0x30/0x100
Nov 14 17:27:00 docker5 kernel: [40161.572310] LR [c0000000002273e0] 
account_page_dirtied+0x100/0x250
Nov 14 17:27:00 docker5 kernel: [40161.572373] Call Trace:
Nov 14 17:27:00 docker5 kernel: [40161.572401] [c00000eaa4ac37b0] 
[c00000eaa4ac37f0] 0xc00000eaa4ac37f0 (unreliable)
Nov 14 17:27:00 docker5 kernel: [40161.572491] [c00000eaa4ac37f0] 
[c0000000002273e0] account_page_dirtied+0x100/0x250
Nov 14 17:27:00 docker5 kernel: [40161.572580] [c00000eaa4ac3840] 
[c00000000031031c] __set_page_dirty+0x7c/0x130
Nov 14 17:27:00 docker5 kernel: [40161.572656] [c00000eaa4ac3890] 
[c0000000003106f8] mark_buffer_dirty+0x178/0x1c0
Nov 14 17:27:00 docker5 kernel: [40161.572746] [c00000eaa4ac38d0] 
[c0000000003a5c54] ext4_commit_super+0x1d4/0x340
Nov 14 17:27:00 docker5 kernel: [40161.572835] [c00000eaa4ac3970] 
[c0000000003a8d58] ext4_setup_super+0x118/0x250
Nov 14 17:27:00 docker5 kernel: [40161.572924] [c00000eaa4ac3a00] 
[c0000000003abce4] ext4_fill_super+0x1c04/0x3250
Nov 14 17:27:00 docker5 kernel: [40161.573013] [c00000eaa4ac3b50] 
[c0000000002c9964] mount_bdev+0x234/0x270
Nov 14 17:27:00 docker5 kernel: [40161.573089] [c00000eaa4ac3bd0] 
[c0000000003a3178] ext4_mount+0x48/0x60
Nov 14 17:27:00 docker5 kernel: [40161.573165] [c00000eaa4ac3c10] 
[c0000000002cad9c] mount_fs+0x8c/0x230
Nov 14 17:27:00 docker5 kernel: [40161.573242] [c00000eaa4ac3cb0] 
[c0000000002f0518] vfs_kern_mount+0x78/0x180
Nov 14 17:27:00 docker5 kernel: [40161.573319] [c00000eaa4ac3d00] 
[c0000000002f5150] do_mount+0x2e0/0xf60
Nov 14 17:27:00 docker5 kernel: [40161.573436] [c00000eaa4ac3dd0] 
[c0000000002f61c4] SyS_mount+0xa4/0x110
Nov 14 17:27:00 docker5 kernel: [40161.573579] [c00000eaa4ac3e30] 
[c000000000009260] system_call+0x38/0xd0
Nov 14 17:27:00 docker5 kernel: [40161.573718] Instruction dump:
Nov 14 17:27:00 docker5 kernel: [40161.573790] 3c4c00f7 38428da0 
7c0802a6 fba1ffe8 fbc1fff0 fbe1fff8 f8010010 f821ffc1
Nov 14 17:27:00 docker5 kernel: [40161.574046] 7c7f1b78 7c9d2378 
e94d0030 e9230020 <7fc952aa> 7fde2214 7fbe2800 409c0014
Nov 14 17:27:00 docker5 kernel: [40161.574298] ---[ end trace 
25e9f03d556f3e5b ]---

root@...ker5:~/linux# addr2line 0xc00000000056de90 -e vmlinux.nostrip
lib/percpu_counter.c:80
root@...ker5:~/linux# addr2line c0000000002273e0 -e vmlinux.nostrip
include/linux/backing-dev.h:61

- Raghu

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