This bug was fixed in the package linux - 4.4.0-79.100 --------------- linux (4.4.0-79.100) xenial; urgency=low
* linux: 4.4.0-79.100 -proposed tracker (LP: #1691180) * linux-aws/linux-gke incorrectly producing and using linux-*-tools- common/linux-*-cloud-tools-common (LP: #1688579) - [Config] make linux-tools-common and linux-cloud-tools-common provide linux- gke versions - [Config] make linux-tools-common and linux-cloud-tools-common provide linux- aws versions - [Packaging] prevent linux-*-tools-common from being produced from non linux packages * CVE-2017-0605 - tracing: Use strlcpy() instead of strcpy() in __trace_find_cmdline() * i915-bpo crashes on external hdmi input (LP: #1580272) - SAUCE: i915_bpo: Silence the warning about watermark entries not changing * Kernel panics on Xenial when using cgroups and strict CFS limits (LP: #1687512) - sched/fair: Initialize throttle_count for new task-groups lazily - sched/fair: Do not announce throttled next buddy in dequeue_task_fair() * bonding - mlx5 - speed changed to 0 after changing ring size (LP: #1687877) - bonding: allow notifications for bond_set_slave_link_state * Xenial update to 4.4.67 stable release (LP: #1689296) - timerfd: Protect the might cancel mechanism proper - Handle mismatched open calls - ASoC: intel: Fix PM and non-atomic crash in bytcr drivers - ALSA: ppc/awacs: shut up maybe-uninitialized warning - drbd: avoid redefinition of BITS_PER_PAGE - mtd: avoid stack overflow in MTD CFI code - net: tg3: avoid uninitialized variable warning - netlink: Allow direct reclaim for fallback allocation - IB/qib: rename BITS_PER_PAGE to RVT_BITS_PER_PAGE - IB/ehca: fix maybe-uninitialized warnings - ext4: require encryption feature for EXT4_IOC_SET_ENCRYPTION_POLICY - ext4 crypto: revalidate dentry after adding or removing the key - ext4 crypto: use dget_parent() in ext4_d_revalidate() - ext4/fscrypto: avoid RCU lookup in d_revalidate - nfsd4: minor NFSv2/v3 write decoding cleanup - nfsd: stricter decoding of write-like NFSv2/v3 ops - dm ioctl: prevent stack leak in dm ioctl call - Linux 4.4.67 * Precision Rack failed to resume from S4 (LP: #1686061) - x86 / hibernate: Use hlt_play_dead() when resuming from hibernation - x86/boot: Split out kernel_ident_mapping_init() - x86/power/64: Always create temporary identity mapping correctly * Xenial update to 4.4.66 stable release (LP: #1688505) - f2fs: do more integrity verification for superblock - xc2028: unlock on error in xc2028_set_config() - ARM: OMAP2+: timer: add probe for clocksources - clk: sunxi: Add apb0 gates for H3 - crypto: testmgr - fix out of bound read in __test_aead() - drm/amdgpu: fix array out of bounds - ext4: check if in-inode xattr is corrupted in ext4_expand_extra_isize_ea() - md:raid1: fix a dead loop when read from a WriteMostly disk - MIPS: Fix crash registers on non-crashing CPUs - net: cavium: liquidio: Avoid dma_unmap_single on uninitialized ndata - net_sched: close another race condition in tcf_mirred_release() - RDS: Fix the atomicity for congestion map update - regulator: core: Clear the supply pointer if enabling fails - usb: gadget: f_midi: Fixed a bug when buflen was smaller than wMaxPacketSize - xen/x86: don't lose event interrupts - sparc64: kern_addr_valid regression - sparc64: Fix kernel panic due to erroneous #ifdef surrounding pmd_write() - net: neigh: guard against NULL solicit() method - net: phy: handle state correctly in phy_stop_machine - l2tp: purge socket queues in the .destruct() callback - l2tp: take reference on sessions being dumped - l2tp: fix PPP pseudo-wire auto-loading - net: ipv4: fix multipath RTM_GETROUTE behavior when iif is given - sctp: listen on the sock only when it's state is listening or closed - tcp: clear saved_syn in tcp_disconnect() - dp83640: don't recieve time stamps twice - net: ipv6: RTF_PCPU should not be settable from userspace - netpoll: Check for skb->queue_mapping - ip6mr: fix notification device destruction - macvlan: Fix device ref leak when purging bc_queue - ipv6: check skb->protocol before lookup for nexthop - ipv6: check raw payload size correctly in ioctl - ALSA: firewire-lib: fix inappropriate assignment between signed/unsigned type - ALSA: seq: Don't break snd_use_lock_sync() loop by timeout - MIPS: KGDB: Use kernel context for sleeping threads - MIPS: Avoid BUG warning in arch_check_elf - p9_client_readdir() fix - Input: i8042 - add Clevo P650RS to the i8042 reset list - nfsd: check for oversized NFSv2/v3 arguments - ARCv2: save r30 on kernel entry as gcc uses it for code-gen - ftrace/x86: Fix triple fault with graph tracing and suspend-to-ram - Linux 4.4.66 * Xenial update to 4.4.65 stable release (LP: #1688483) - tipc: make sure IPv6 header fits in skb headroom - tipc: make dist queue pernet - tipc: re-enable compensation for socket receive buffer double counting - tipc: correct error in node fsm - tty: nozomi: avoid a harmless gcc warning - hostap: avoid uninitialized variable use in hfa384x_get_rid - gfs2: avoid uninitialized variable warning - tipc: fix random link resets while adding a second bearer - tipc: fix socket timer deadlock - xc2028: avoid use after free - netfilter: nfnetlink: correctly validate length of batch messages - tipc: check minimum bearer MTU - vfio/pci: Fix integer overflows, bitmask check - staging/android/ion : fix a race condition in the ion driver - ping: implement proper locking - perf/core: Fix concurrent sys_perf_event_open() vs. 'move_group' race - Linux 4.4.65 * Xenial update to 4.4.64 stable release (LP: #1687638) - KEYS: Disallow keyrings beginning with '.' to be joined as session keyrings - KEYS: Change the name of the dead type to ".dead" to prevent user access - KEYS: fix keyctl_set_reqkey_keyring() to not leak thread keyrings - tracing: Allocate the snapshot buffer before enabling probe - ring-buffer: Have ring_buffer_iter_empty() return true when empty - cifs: Do not send echoes before Negotiate is complete - CIFS: remove bad_network_name flag - s390/mm: fix CMMA vs KSM vs others - VSOCK: Detach QP check should filter out non matching QPs. - Input: elantech - add Fujitsu Lifebook E547 to force crc_enabled - ACPI / power: Avoid maybe-uninitialized warning - mmc: sdhci-esdhc-imx: increase the pad I/O drive strength for DDR50 card - mac80211: reject ToDS broadcast data frames - ubi/upd: Always flush after prepared for an update - powerpc/kprobe: Fix oops when kprobed on 'stdu' instruction - x86/mce/AMD: Give a name to MCA bank 3 when accessed with legacy MSRs - kvm: arm/arm64: Fix locking for kvm_free_stage2_pgd - x86, pmem: fix broken __copy_user_nocache cache-bypass assumptions - block: fix del_gendisk() vs blkdev_ioctl crash - tipc: fix crash during node removal - Linux 4.4.64 * Xenial update to 4.4.63 stable release (LP: #1687629) - cgroup, kthread: close race window where new kthreads can be migrated to non-root cgroups - thp: fix MADV_DONTNEED vs clear soft dirty race - drm/nouveau/mpeg: mthd returns true on success now - drm/nouveau/mmu/nv4a: use nv04 mmu rather than the nv44 one - CIFS: store results of cifs_reopen_file to avoid infinite wait - Input: xpad - add support for Razer Wildcat gamepad - perf/x86: Avoid exposing wrong/stale data in intel_pmu_lbr_read_32() - x86/vdso: Ensure vdso32_enabled gets set to valid values only - x86/vdso: Plug race between mapping and ELF header setup - acpi, nfit, libnvdimm: fix interleave set cookie calculation (64-bit comparison) - iscsi-target: Fix TMR reference leak during session shutdown - iscsi-target: Drop work-around for legacy GlobalSAN initiator - scsi: sr: Sanity check returned mode data - scsi: sd: Consider max_xfer_blocks if opt_xfer_blocks is unusable - scsi: sd: Fix capacity calculation with 32-bit sector_t - xen, fbfront: fix connecting to backend - libnvdimm: fix reconfig_mutex, mmap_sem, and jbd2_handle lockdep splat - irqchip/irq-imx-gpcv2: Fix spinlock initialization - ftrace: Fix removing of second function probe - char: Drop bogus dependency of DEVPORT on !M68K - char: lack of bool string made CONFIG_DEVPORT always on - Revert "MIPS: Lantiq: Fix cascaded IRQ setup" - kvm: fix page struct leak in handle_vmon - zram: do not use copy_page with non-page aligned address - powerpc: Disable HFSCR[TM] if TM is not supported - crypto: ahash - Fix EINPROGRESS notification callback - ath9k: fix NULL pointer dereference - dvb-usb-v2: avoid use-after-free - ext4: fix inode checksum calculation problem if i_extra_size is small - platform/x86: acer-wmi: setup accelerometer when machine has appropriate notify event - rtc: tegra: Implement clock handling - mm: Tighten x86 /dev/mem with zeroing reads - dvb-usb: don't use stack for firmware load - dvb-usb-firmware: don't do DMA on stack - virtio-console: avoid DMA from stack - pegasus: Use heap buffers for all register access - rtl8150: Use heap buffers for all register access - catc: Combine failure cleanup code in catc_probe() - catc: Use heap buffer for memory size test - tty/serial: atmel: RS485 half duplex w/DMA: enable RX after TX is done - net: ipv6: check route protocol when deleting routes - MIPS: fix Select HAVE_IRQ_EXIT_ON_IRQ_STACK patch. - Linux 4.4.63 -- Kleber Sacilotto de Souza <kleber.so...@canonical.com> Wed, 17 May 2017 16:44:58 +0200 ** Changed in: linux (Ubuntu Xenial) Status: Fix Committed => Fix Released ** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-0605 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1687512 Title: Kernel panics on Xenial when using cgroups and strict CFS limits Status in linux package in Ubuntu: Triaged Status in linux source package in Xenial: Fix Released Bug description: SRU Justification ----------------- [Impact] Apache Mesos and Kubernetes workloads on Xenial cause a panic (NULL pointer dereference) in the completely fair scheduler. These panics are in pick_next_entity and include pick_next_task_fair in the call stack. [Fix] Cherry-picking both 754bd598be9bbc953bc709a9e8ed7f3188bfb9d7 (http://lkml.kernel.org/r/146608183552.21905.15924473394414832071.stgit@buzz) and 094f469172e00d6ab0a3130b0e01c83b3cf3a98d (http://lkml.kernel.org/r/146608182119.21870.8439834428248129633.stgit@buzz) fix the crash. They appear to be intended as a series - they were posted to LKML at the same time. [Testcase] The fix has been validated by the user who reported the bug Bug description --------------- We see a number of kernel panics on servers running Apache Mesos using cgroups with small (0.1-0.2) cpu limits. These all appear as NULL pointer dereferences in and around pick_next_entity and pick_next_task_fair, for example: [24334.493331] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050 [24334.501611] IP: [<ffffffff810b2f0f>] pick_next_entity+0x7f/0x160 [24334.507868] PGD 3eacfa067 PUD 3eacfb067 PMD 0 [24334.512806] Oops: 0000 [#1] SMP [24334.516420] Modules linked in: ipvlan xt_nat xt_tcpudp veth ipt_MASQUERADE nf_nat_masquerade_ipv4 xfrm_user xfrm_algo iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter ip_tables xt_conntrack x_tables nf_nat nf_conntrack br_netfilter bridge stp llc aufs tcp_diag inet_diag nfsd auth_rpcgss nfs_acl nfs lockd grace sunrpc fscache dm_crypt ppdev input_leds mac_hid i2c_piix4 8250_fintek parport_pc pvpanic parport serio_raw crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse virtio_scsi [24334.576359] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.4.0-66-generic #87~14.04.1-Ubuntu [24334.584748] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [24334.594188] task: ffff8803ee671c00 ti: ffff8803ee67c000 task.ti: ffff8803ee67c000 [24334.601799] RIP: 0010:[<ffffffff810b2f0f>] [<ffffffff810b2f0f>] pick_next_entity+0x7f/0x160 [24334.610490] RSP: 0018:ffff8803ee67fdd8 EFLAGS: 00010086 [24334.615924] RAX: ffff8803ebed4c00 RBX: ffff880036529800 RCX: 0000000000000000 [24334.623190] RDX: 000000000225341f RSI: 0000000000000000 RDI: 0000000000000000 [24334.630479] RBP: ffff8803ee67fe00 R08: 0000000000000004 R09: 0000000000000000 [24334.637758] R10: ffff8803e7ed7600 R11: 0000000000000001 R12: 0000000000000000 [24334.645153] R13: 0000000000000000 R14: 00000009067729c4 R15: ffff8803ee672178 [24334.652512] FS: 0000000000000000(0000) GS:ffff8803ffd00000(0000) knlGS:0000000000000000 [24334.660721] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [24334.666587] CR2: 0000000000000050 CR3: 00000003eacf9000 CR4: 00000000001406e0 [24334.673851] Stack: [24334.675980] ffff8803ffd16e00 ffff8803ffd16e00 ffff8803e855a200 ffff880036529800 [24334.683995] 0000000000000002 ffff8803ee67fe68 ffffffff810b98a6 ffff8803ffd16e70 [24334.692024] 0000000000016e00 ffff8803e7ed7600 ffff8803ee671c00 0000000000000000 [24334.700172] Call Trace: [24334.702750] [<ffffffff810b98a6>] pick_next_task_fair+0x66/0x4b0 [24334.708886] [<ffffffff818043c4>] __schedule+0x7f4/0x980 [24334.714349] [<ffffffff81804585>] schedule+0x35/0x80 [24334.719445] [<ffffffff8180481e>] schedule_preempt_disabled+0xe/0x10 [24334.725962] [<ffffffff810bf9fa>] cpu_startup_entry+0x18a/0x350 [24334.732012] [<ffffffff8104f3d9>] start_secondary+0x149/0x170 [24334.737895] Code: 8b 70 50 4d 2b 74 24 50 4d 85 f6 7e 59 4c 89 e7 e8 67 ff ff ff 49 39 c6 7f 04 4c 8b 6b 48 48 8b 43 40 48 85 c0 74 1f 4c 8b 70 50 <4d> 2b 74 24 50 4d 85 f6 7e 2c 4c 89 e7 e8 3f ff ff ff 49 39 c6 [24334.765124] RIP [<ffffffff810b2f0f>] pick_next_entity+0x7f/0x160 [24334.771473] RSP <ffff8803ee67fdd8> [24334.775077] CR2: 0000000000000050 [24334.779121] ---[ end trace 05d941efb97b7bae ]--- and [155852.028575] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050 [155852.036931] IP: [<ffffffff810b2f0f>] pick_next_entity+0x7f/0x160 [155852.043491] PGD 3ebae8067 PUD 3ebae9067 PMD 0 [155852.048550] Oops: 0000 [#1] SMP [155852.052437] Modules linked in: ipvlan veth xt_nat xt_tcpudp ipt_MASQUERADE nf_nat_masquerade_ipv4 xfrm_user xfrm_algo iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter ip_tables xt_conntrack x_tables nf_nat nf_conntrack br_netfilter bridge stp llc aufs nfsd auth_rpcgss nfs_acl nfs lockd grace sunrpc fscache dm_crypt ppdev input_leds mac_hid i2c_piix4 parport_pc 8250_fintek pvpanic parport serio_raw crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse virtio_scsi [155852.109847] CPU: 1 PID: 2215 Comm: ruby Not tainted 4.4.0-66-generic #87~14.04.1-Ubuntu [155852.118233] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [155852.127661] task: ffff8803ed29aa00 ti: ffff8800bbb10000 task.ti: ffff8800bbb10000 [155852.135347] RIP: 0010:[<ffffffff810b2f0f>] [<ffffffff810b2f0f>] pick_next_entity+0x7f/0x160 [155852.144120] RSP: 0018:ffff8800bbb13ce0 EFLAGS: 00010086 [155852.149631] RAX: ffff8801725b5c00 RBX: ffff8800bb777600 RCX: ffff8800bb777400 [155852.156970] RDX: ffff8803ffc96e70 RSI: 0000000000000000 RDI: 0000000000000000 [155852.164384] RBP: ffff8800bbb13d08 R08: ffff8803eb92e800 R09: ffff8803ed29aa00 [155852.171718] R10: 0000000000000001 R11: 00000000000003cb R12: 0000000000000000 [155852.179052] R13: 0000000000000000 R14: 000009ad6846ff10 R15: 0000000000000001 [155852.186387] FS: 00007f387d1c9700(0000) GS:ffff8803ffc80000(0000) knlGS:0000000000000000 [155852.194677] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [155852.200626] CR2: 0000000000000050 CR3: 00000003eb706000 CR4: 00000000001406e0 [155852.207967] Stack: [155852.210180] ffffffff810369c9 ffff8803ffc96e00 ffff8800bb777600 0000000000000000 [155852.218278] 00000000000012a4 ffff8800bbb13d70 ffffffff810b9b65 ffff8803ffc96e70 [155852.226402] 0000000000016e00 00008dbf20ccb260 ffff8803ed29aa00 0000000000000001 [155852.234506] Call Trace: [155852.237156] [<ffffffff810369c9>] ? sched_clock+0x9/0x10 [155852.242673] [<ffffffff810b9b65>] pick_next_task_fair+0x325/0x4b0 [155852.248968] [<ffffffff81803cd9>] __schedule+0x109/0x980 [155852.254491] [<ffffffff81804585>] schedule+0x35/0x80 [155852.259667] [<ffffffff8180727c>] schedule_hrtimeout_range_clock+0xac/0x130 [155852.266838] [<ffffffff810e9fb0>] ? hrtimer_init+0x180/0x180 [155852.272712] [<ffffffff81807270>] ? schedule_hrtimeout_range_clock+0xa0/0x130 [155852.280052] [<ffffffff81807313>] schedule_hrtimeout_range+0x13/0x20 [155852.288558] [<ffffffff812479b9>] ep_poll+0x249/0x310 [155852.293817] [<ffffffff810a8c30>] ? wake_up_q+0x80/0x80 [155852.299271] [<ffffffff81248efc>] SyS_epoll_wait+0xbc/0xe0 [155852.304967] [<ffffffff81807df6>] entry_SYSCALL_64_fastpath+0x16/0x75 [155852.311618] Code: 8b 70 50 4d 2b 74 24 50 4d 85 f6 7e 59 4c 89 e7 e8 67 ff ff ff 49 39 c6 7f 04 4c 8b 6b 48 48 8b 43 40 48 85 c0 74 1f 4c 8b 70 50 <4d> 2b 74 24 50 4d 85 f6 7e 2c 4c 89 e7 e8 3f ff ff ff 49 39 c6 [155852.338852] RIP [<ffffffff810b2f0f>] pick_next_entity+0x7f/0x160 [155852.345270] RSP <ffff8800bbb13ce0> [155852.348958] CR2: 0000000000000050 [155852.353086] ---[ end trace 8ce693b2314611c4 ]--- Similar issues have been reported in the community for kernels based on 4.4: https://github.com/kubernetes/kops/issues/874 These panics occur in the CFS code when a next buddy is set on an entity that is not on a run-queue. This causes pick_next_entity to end up with curr == left == NULL, which means it will call into wakeup_preempt_entity() with a valid next buddy and a NULL left, which it will try to dereference, causing a panic. This was confirmed by placing a WARN_ON_ONCE in set_next_buddy to catch when a sched_entity in the hierarchy was not on_rq, as per https://marc.info/?l=linux-kernel&m=146651668921468&w=2 The stack-trace for the WARN is quite involved: Apr 25 14:14:48 (none) kernel: [ 5339.764597] ------------[ cut here ]------------ Apr 25 14:14:48 (none) kernel: [ 5339.764606] WARNING: CPU: 1 PID: 13121 at /build/linux-PwPelj/linux-4.4.0/kernel/sched/fair.c:5170 set_next_buddy+0x55/0x70() Apr 25 14:14:48 (none) kernel: [ 5339.764608] Modules linked in: xt_nat xt_tcpudp ipvlan ipt_MASQUERADE nf_nat_masquerade_ipv4 xfrm_user xfrm_algo iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter ip_tables xt_conntrack x_tables nf_nat nf_conntrack br_netfilter bridge stp llc aufs nfsd auth_rpcgss nfs_acl nfs dm_crypt lockd grace sunrpc fscache ppdev input_leds serio_raw parport_pc 8250_fintek parport pvpanic mac_hid i2c_piix4 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse virtio_scsi Apr 25 14:14:48 (none) kernel: [ 5339.764644] CPU: 1 PID: 13121 Comm: executor Not tainted 4.4.0-72-generic #93+hf135461v20170420b2-Ubuntu Apr 25 14:14:48 (none) kernel: [ 5339.764646] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Apr 25 14:14:48 (none) kernel: [ 5339.764647] 0000000000000086 00000000d5fbe9e0 ffff8803ed947608 ffffffff813f83c3 Apr 25 14:14:48 (none) kernel: [ 5339.764650] 0000000000000000 ffffffff81cbae20 ffff8803ed947640 ffffffff81081302 Apr 25 14:14:48 (none) kernel: [ 5339.764652] ffff8800bb5fc800 ffff8803e7c9f000 0000000000000008 ffff8800ba1bd400 Apr 25 14:14:48 (none) kernel: [ 5339.764655] Call Trace: Apr 25 14:14:48 (none) kernel: [ 5339.764665] [<ffffffff813f83c3>] dump_stack+0x63/0x90 Apr 25 14:14:48 (none) kernel: [ 5339.764669] [<ffffffff81081302>] warn_slowpath_common+0x82/0xc0 Apr 25 14:14:48 (none) kernel: [ 5339.764672] [<ffffffff8108144a>] warn_slowpath_null+0x1a/0x20 Apr 25 14:14:48 (none) kernel: [ 5339.764674] [<ffffffff810b52b5>] set_next_buddy+0x55/0x70 Apr 25 14:14:48 (none) kernel: [ 5339.764676] [<ffffffff810b59a4>] check_preempt_wakeup+0x244/0x250 Apr 25 14:14:48 (none) kernel: [ 5339.764679] [<ffffffff810ab580>] check_preempt_curr+0x80/0x90 Apr 25 14:14:48 (none) kernel: [ 5339.764682] [<ffffffff810b42eb>] attach_task+0x4b/0x60 Apr 25 14:14:48 (none) kernel: [ 5339.764685] [<ffffffff810be067>] load_balance+0x5b7/0x980 Apr 25 14:14:48 (none) kernel: [ 5339.764688] [<ffffffff810be6e1>] pick_next_task_fair+0x2b1/0x4f0 Apr 25 14:14:48 (none) kernel: [ 5339.764692] [<ffffffff81837c5f>] __schedule+0x15f/0xa30 Apr 25 14:14:48 (none) kernel: [ 5339.764694] [<ffffffff81838565>] schedule+0x35/0x80 Apr 25 14:14:48 (none) kernel: [ 5339.764697] [<ffffffff8183ba85>] schedule_hrtimeout_range_clock+0xc5/0x1b0 Apr 25 14:14:48 (none) kernel: [ 5339.764700] [<ffffffff810ef880>] ? __hrtimer_init+0x90/0x90 Apr 25 14:14:48 (none) kernel: [ 5339.764703] [<ffffffff8183ba79>] ? schedule_hrtimeout_range_clock+0xb9/0x1b0 Apr 25 14:14:48 (none) kernel: [ 5339.764705] [<ffffffff8183bb83>] schedule_hrtimeout_range+0x13/0x20 Apr 25 14:14:48 (none) kernel: [ 5339.764709] [<ffffffff81223914>] poll_schedule_timeout+0x44/0x70 Apr 25 14:14:48 (none) kernel: [ 5339.764711] [<ffffffff81224407>] do_select+0x727/0x810 Apr 25 14:14:48 (none) kernel: [ 5339.764715] [<ffffffff811fb932>] ? page_counter_uncharge+0x22/0x40 Apr 25 14:14:48 (none) kernel: [ 5339.764718] [<ffffffff811fdb1c>] ? drain_stock.isra.33+0x6c/0xa0 Apr 25 14:14:48 (none) kernel: [ 5339.764720] [<ffffffff810b5349>] ? update_curr+0x79/0x160 Apr 25 14:14:48 (none) kernel: [ 5339.764722] [<ffffffff810b550c>] ? update_cfs_shares+0xbc/0x100 Apr 25 14:14:48 (none) kernel: [ 5339.764724] [<ffffffff810b742b>] ? dequeue_entity+0x41b/0xa80 Apr 25 14:14:48 (none) kernel: [ 5339.764729] [<ffffffff810719f7>] ? gup_pud_range+0x127/0x220 Apr 25 14:14:48 (none) kernel: [ 5339.764731] [<ffffffff810baa9c>] ? set_next_entity+0x9c/0xb0 Apr 25 14:14:48 (none) kernel: [ 5339.764736] [<ffffffff8102d66c>] ? __switch_to+0x1dc/0x5c0 Apr 25 14:14:48 (none) kernel: [ 5339.764740] [<ffffffff81401304>] ? timerqueue_del+0x24/0x70 Apr 25 14:14:48 (none) kernel: [ 5339.764742] [<ffffffff810efa3c>] ? __remove_hrtimer+0x3c/0x90 Apr 25 14:14:48 (none) kernel: [ 5339.764744] [<ffffffff810efb61>] ? hrtimer_try_to_cancel+0xd1/0x130 Apr 25 14:14:48 (none) kernel: [ 5339.764746] [<ffffffff810efbd9>] ? hrtimer_cancel+0x19/0x20 Apr 25 14:14:48 (none) kernel: [ 5339.764751] [<ffffffff81101166>] ? futex_wait+0x206/0x280 Apr 25 14:14:48 (none) kernel: [ 5339.764753] [<ffffffff810ab5a9>] ? ttwu_do_wakeup+0x19/0xe0 Apr 25 14:14:48 (none) kernel: [ 5339.764756] [<ffffffff812246bf>] core_sys_select+0x1cf/0x2f0 Apr 25 14:14:48 (none) kernel: [ 5339.764758] [<ffffffff810ef880>] ? __hrtimer_init+0x90/0x90 Apr 25 14:14:48 (none) kernel: [ 5339.764762] [<ffffffff81128447>] ? audit_filter_rules+0x217/0xe30 Apr 25 14:14:48 (none) kernel: [ 5339.764764] [<ffffffff81103860>] ? do_futex+0x120/0x540 Apr 25 14:14:48 (none) kernel: [ 5339.764768] [<ffffffff8106428e>] ? kvm_clock_get_cycles+0x1e/0x20 Apr 25 14:14:48 (none) kernel: [ 5339.764772] [<ffffffff810f53aa>] ? ktime_get_ts64+0x4a/0xf0 Apr 25 14:14:48 (none) kernel: [ 5339.764774] [<ffffffff8122489a>] SyS_select+0xba/0x110 Apr 25 14:14:48 (none) kernel: [ 5339.764777] [<ffffffff8183c672>] entry_SYSCALL_64_fastpath+0x16/0x71 Apr 25 14:14:48 (none) kernel: [ 5339.764779] ---[ end trace ace97b626b47e1f9 ]--- Cherry-picking both 754bd598be9bbc953bc709a9e8ed7f3188bfb9d7 (http://lkml.kernel.org/r/146608183552.21905.15924473394414832071.stgit@buzz) and 094f469172e00d6ab0a3130b0e01c83b3cf3a98d (http://lkml.kernel.org/r/146608182119.21870.8439834428248129633.stgit@buzz) fix the crash. They appear to be intended as a series. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1687512/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp