** Attachment added: "membomb.py" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1709591/+attachment/4929308/+files/membomb.py
** Description changed: Hello. I use unprivileged LXC containers with running systemd, systemd-journald, apache and nginx on it. Each lxc config have memory limits (lxc.cgroup.memory.limit_in_bytes) and this scheme stable work long time. After I add MemoryLimit to apache service file sometime the kernel crashes with unix_gc RIP. For simulate situation I running script "membomb.py" using service file "membomb.service" (with included MemoryLimit) on each container and the kernel stable crashes. I try update the kernel from 4.4.0-77 to 4.4.0-89 and change server (from IBM to Supermicro), stack trace changed but problem still exist. + [ 2477.309371] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 + [ 2477.310336] IP: [<ffffffff817def24>] unix_gc+0xc4/0x3a0 + [ 2477.311236] PGD 0 + [ 2477.312104] Oops: 0000 [#1] SMP + [ 2477.312952] Modules linked in: ebt_arpreply ebt_arp ebtable_nat ebtables veth nfnetlink_queue nfnetlink_log nfnetlink bluetooth netconsole configfs ip6table_filter ip6_tables ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_nat xt_tcpudp iptable_nat nf_nat_ipv4 nf_nat ipt_REJECT nf_reject_ipv4 nf_conntrack_ipv4 nf_defrag_ + ipv4 xt_multiport xt_conntrack iptable_filter ip_tables x_tables bridge ipmi_ssif intel_rapl x86_pkg_temp_thermal coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 8021q lrw garp gf128mul mrp glue_helper stp ablk_helper llc cryptd joydev input_leds sb_edac edac_ + core mei_me mei lpc_ich shpchp ioatdma ipmi_si 8250_fintek ipmi_msghandler acpi_power_meter mac_hid binfmt_misc nf_conntrack_ftp nf_conntrack autofs4 xfs btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear ast ttm drm_kms_helper hid_gener + ic igb syscopyarea sysfillrect usbhid sysimgblt dca fb_sys_fops ptp drm hid ahci pps_core libahci i2c_algo_bit wmi fjes + [ 2477.321346] CPU: 1 PID: 2264 Comm: systemd-cgroups Not tainted 4.4.0-89-generic #112-Ubuntu + [ 2477.322281] Hardware name: Supermicro Super Server/X10DRW-i, BIOS 2.0 12/17/2015 + [ 2477.323211] task: ffff880873b7aa00 ti: ffff8808239e8000 task.ti: ffff8808239e8000 + [ 2477.324143] RIP: 0010:[<ffffffff817def24>] [<ffffffff817def24>] unix_gc+0xc4/0x3a0 + [ 2477.325078] RSP: 0018:ffff8808239ebd58 EFLAGS: 00010287 + [ 2477.326000] RAX: ffff88167eb09ff8 RBX: ffff8808239ebd68 RCX: 0000000000000000 + [ 2477.326926] RDX: ffff88167eb0a328 RSI: ffff88167eb08ff8 RDI: ffff88167eb0f400 + [ 2477.327852] RBP: ffff8808239ebdb0 R08: 0000000000000002 R09: 0000000000000000 + [ 2477.328777] R10: ffff880860f096b0 R11: ffff88086c08c710 R12: ffff88080b51b0a8 + [ 2477.329698] R13: 0000000000000001 R14: ffff88080b51b080 R15: ffff88080b519400 + [ 2477.330617] FS: 00007f9239bc4840(0000) GS:ffff88103fc40000(0000) knlGS:0000000000000000 + [ 2477.331551] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 + [ 2477.332485] CR2: 0000000000000018 CR3: 000000082cadd000 CR4: 00000000001406e0 + [ 2477.333429] Stack: + [ 2477.334365] 0000000000000000 0000000000000246 ffff8808239ebd68 ffff8808239ebd68 + [ 2477.335331] 0000000000000202 0000000000000202 ffff8808239ebdb0 ddb43b7044268f20 + [ 2477.336294] ffff88080b51b000 ffff88080b51b0a8 0000000000000001 ffff8808239ebe10 + [ 2477.337262] Call Trace: + [ 2477.338220] [<ffffffff817dc882>] unix_release_sock+0x1c2/0x2f0 + [ 2477.339187] [<ffffffff817dc9d0>] unix_release+0x20/0x30 + [ 2477.340152] [<ffffffff8171857f>] sock_release+0x1f/0x80 + [ 2477.341112] [<ffffffff817185f2>] sock_close+0x12/0x20 + [ 2477.342069] [<ffffffff81211284>] __fput+0xe4/0x220 + [ 2477.343005] [<ffffffff812113fe>] ____fput+0xe/0x10 + [ 2477.343918] [<ffffffff8109f0d1>] task_work_run+0x81/0xa0 + [ 2477.344824] [<ffffffff81003242>] exit_to_usermode_loop+0xc2/0xd0 + [ 2477.345729] [<ffffffff81003c6e>] syscall_return_slowpath+0x4e/0x60 + [ 2477.346631] [<ffffffff81842090>] int_ret_from_sys_call+0x25/0x8f + [ 2477.347512] Code: 74 51 48 8b b0 30 03 00 00 48 8d 90 30 03 00 00 48 81 ee 30 03 00 00 48 81 fa a0 0d f0 81 0f 84 af 00 00 00 48 8b 88 48 02 00 00 <48> 8b 49 18 4c 8b 41 38 48 8b 88 40 03 00 00 48 85 c9 0f 8e 8e + [ 2477.349382] RIP [<ffffffff817def24>] unix_gc+0xc4/0x3a0 + [ 2477.350254] RSP <ffff8808239ebd58> + [ 2477.351107] CR2: 0000000000000018 + [ 2477.355696] ---[ end trace 5c1dd6254f090648 ]--- + + ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-89-generic 4.4.0-89.112 ProcVersionSignature: Ubuntu 4.4.0-89.112-generic 4.4.76 Uname: Linux 4.4.0-89-generic x86_64 AlsaDevices: - total 0 - crw-rw---- 1 root audio 116, 1 Aug 9 13:09 seq - crw-rw---- 1 root audio 116, 33 Aug 9 13:09 timer + total 0 + crw-rw---- 1 root audio 116, 1 Aug 9 13:09 seq + crw-rw---- 1 root audio 116, 33 Aug 9 13:09 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.1-0ubuntu2.10 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: Date: Wed Aug 9 13:10:47 2017 HibernationDevice: RESUME=/dev/mapper/vg_system-swap IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' MachineType: Supermicro Super Server PciMultimedia: - + ProcEnviron: - TERM=xterm-256color - PATH=(custom, no user) - LANG=en_US.UTF-8 - SHELL=/bin/bash + TERM=xterm-256color + PATH=(custom, no user) + LANG=en_US.UTF-8 + SHELL=/bin/bash ProcFB: 0 astdrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-89-generic root=/dev/mapper/vg_system-lv_root ro noquiet nosplash net.ifnames=0 biosdevname=0 RelatedPackageVersions: - linux-restricted-modules-4.4.0-89-generic N/A - linux-backports-modules-4.4.0-89-generic N/A - linux-firmware 1.157.11 + linux-restricted-modules-4.4.0-89-generic N/A + linux-backports-modules-4.4.0-89-generic N/A + linux-firmware 1.157.11 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/17/2015 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 2.0 dmi.board.asset.tag: Default string dmi.board.name: X10DRW-i dmi.board.vendor: Supermicro dmi.board.version: 1.02 dmi.chassis.asset.tag: Default string dmi.chassis.type: 17 dmi.chassis.vendor: Supermicro dmi.chassis.version: 0123456789 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.0:bd12/17/2015:svnSupermicro:pnSuperServer:pvr0123456789:rvnSupermicro:rnX10DRW-i:rvr1.02:cvnSupermicro:ct17:cvr0123456789: dmi.product.name: Super Server dmi.product.version: 0123456789 dmi.sys.vendor: Supermicro -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1709591 Title: kernel crash on unix_gc To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1709591/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
