Hi Seth,
Yes, thanks for your reminder. I found a kernel panic! The logs are below:
[ 3629.66] audit: type=1400 audit(1486525969.972:2717):
apparmor="ALLOWED" operation="create"
profile="snap.paradrop-daemon.paradrop//null-/usr/bin/snap" pid=2475
comm="docker" family="inet6" sock_type="stream" protocol=6
requested_mask="create" denied_mask="create"
[ 3629.712878] BUG: unable to handle kernel paging request at
fff3
[ 3629.796735] IP: [] strlen+0x0/0x20
[ 3629.856430] *PGD 1e0d067 PUD 1e0f067 PMD 0 *
[ 3629.906140] Oops*: [#4] SMP *
[ 3629.945243] Modules linked in*: xt_nat xt_tcpudp veth xt_comment
ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4
nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype xt_conntrack nf_nat nf_conntrack
br_netfilter bridge stp llc overlay aufs arc4 ath10k_pci ath9k ath10k_core
ath9k_common ath9k_hw ath mac80211 kvm_amd kvm uas irqbypass cfg80211
k10temp sp5100_tco r8169 i2c_piix4 mii shpchp mac_hid iptable_filter
ip_tables ip6table_filter ip6_tables x_tables autofs4 mmc_block sdhci_acpi
sdhci_pci sdhci virtio_scsi nls_iso8859_1 usb_storage ahci libahci*
[ 3630.543640] CPU*: 0 PID: 2479 Comm: snap-confine Tainted: G D
4.4.0-59-generic #80-Ubuntu*
[ 3630.654077] Hardware name*: PC Engines APU/APU, BIOS 4.0 09/08/2014*
[ 3630.728123] task*: 88007a338000 ti: 88007a388000 task.ti:
88007a388000*
[ 3630.817768] RIP*: 0010:[] []
strlen+0x0/0x20*
[ 3630.906581] RSP*: 0018:88007a38ba20 EFLAGS: 00010246*
[ 3630.970226] RAX*: 88007a38bb20 RBX: fff3 RCX:
*
[ 3631.055710] RDX*: 0151 RSI: fff3 RDI:
fff3*
[ 3631.141195] RBP*: 88007a38ba38 R08: 880060a4c93b R09:
88007a38ba94*
[ 3631.226679] R10*: 000e R11: 880060a4c934 R12:
88007a701240*
[ 3631.312163] R13*: 88007a338000 R14: 8139b3d0 R15:
fff3*
[ 3631.397650] FS*: 7f0e8d98b740() GS:88007de0()
knlGS:*
[ 3631.494574] CS*: 0010 DS: ES: CR0: 80050033*
[ 3631.563417] CR2*: fff3 CR3: 6719a000 CR4:
06f0*
[ 3631.648901] *Stack:*
[ 3631.673030] * 8112333a 88007a701240 88007a38bb00
88007a38ba60*
[ 3631.762464] * 8139b438 88007a701240 88007a38bb00
88007a338000*
[ 3631.851901] * 88007a38bad8 81370498 81229680
88007a38baf0*
[ 3631.941337] *Call Trace:*
[ 3631.970675] * [] ? audit_log_untrustedstring+0x1a/0x30*
[ 3632.049919] * [] audit_cb+0x68/0x3f0*
[ 3632.110444] * [] common_lsm_audit+0x1b8/0x740*
[ 3632.180330] * [] ? alloc_inode+0x50/0x90*
[ 3632.245011] * [] ? prepend_path+0xc6/0x2a0*
[ 3632.311779] * [] aa_audit+0x5f/0x170*
[ 3632.372300] * [] audit_mount+0x152/0x160*
[ 3632.436988] * [] match_mnt_path_str+0x1dd/0x490*
[ 3632.508951] * [] ? dentry_path+0x18/0x70*
[ 3632.573638] * [] match_mnt+0xda/0x150*
[ 3632.635203] * [] aa_bind_mount+0x100/0x180*
[ 3632.701969] * [] wrap_apparmor_sb_mount+0x1c0/0x270*
[ 3632.778095] * [] security_sb_mount+0x57/0x80*
[ 3632.846939] * [] do_mount+0xab/0xda0*
[ 3632.907468] * [] ? __kmalloc_track_caller+0x1b4/0x250*
[ 3632.985668] * [] ? hrtimer_try_to_cancel+0xd1/0x130*
[ 3633.061798] * [] ? memdup_user+0x42/0x70*
[ 3633.126479] * [] SyS_mount+0x9f/0x100*
[ 3633.188050] * [] entry_SYSCALL_64_fastpath+0x16/0x71*
[ 3633.265205] Code*: 89 f8 48 89 e5 f6 82 e0 0d a5 81 20 74 10 48 83 c0 01
0f b6 10 f6 82 e0 0d a5 81 20 75 f0 5d c3 90 66 2e 0f 1f 84 00 00 00 00 00
<80> 3f 00 55 48 89 e5 74 11 48 89 f8 48 83 c0 01 80 38 00 75 f7 *
[ 3633.504601] RIP [] strlen+0x0/0x20
[ 3633.565335] * RSP *
[ 3633.607143] CR2*: fff3*
[ 3633.646880] *---[ end trace 23ca1e52db270fbd ]---*
Thanks.
Peng
On Tue, Feb 7, 2017 at 9:46 PM, Seth Arnold
wrote:
> On Tue, Feb 07, 2017 at 09:43:38PM -0600, Peng Liu wrote:
> > I built a snap which needs to call "docker" command instead of using
> > bindings like docker-py to get logs from a container. Unfortunately, the
> > command reported an error with messages "support process for mount
> > namespace capture exited abnormally".
>
> Are there any hints in dmesg or more detailed log files that might provide
> a direction to start looking?
>
> Thanks
>
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