Tag Archives: kernel

linux 系统 tcp_mark_head_lost 错误处理

By | 2019-07-10

问题说明 近期一台主机报以下 kernel 信息: Jul 8 10:47:42 cztest kernel: ————[ cut here ]———— Jul 8 10:47:42 cztest kernel: WARNING: at net/ipv4/tcp_input.c:2269 tcp_mark_head_lost+0x113/0x290() Jul 8 10:47:42 cztest kernel: Modules linked in: iptable_filter ip_tables binfmt_misc cdc_ether usbnet mii xt_multiport dm_mirror dm_region_hash dm_log dm_mod intel_powerclamp coretemp intel_rapl iosf_mbi kvm_intel kvm irqbypass crc32_p clmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper… Read More »

linux 系统 bad pmd 错误处理

By | 2019-05-08

问题说明 近期一台主机报以下 kernel 警告信息: May 4 22:19:52 cztest kernel: mm/memory.c:413: bad pmd ffff9f1b3127e710(80000010ba8008e7) May 4 22:19:52 cztest telegraf: fatal error: s.freeindex > s.nelems May 4 22:19:52 cztest telegraf: goroutine 33796712 [running]: …… May 4 22:19:52 cztest kernel: ————[ cut here ]———— May 4 22:19:52 cztest kernel: WARNING: CPU: 16 PID: 1646 at mm/mmap.c:3042 exit_mmap+0x196/0x1a0 May… Read More »

linux 系统 page allocation failure 问题处理

By | 2019-04-28

问题说明 近期一台主机报以下 kernel 警告信息: Apr 28 05:30:51 cztest kernel: swapper/13: page allocation failure: order:5, mode:0x4020 Apr 28 05:30:51 cztest kernel: Pid: 0, comm: swapper/13 Not tainted 3.4.24-x86_64 #3 Apr 28 05:30:51 cztest kernel: Call Trace: Apr 28 05:30:51 cztest kernel: <IRQ> [<ffffffff8109b77b>] warn_alloc_failed+0xeb/0x130 Apr 28 05:30:51 cztest kernel: [<ffffffff8105611e>] ? __wake_up+0x4e/0x70 Apr 28 05:30:51 cztest… Read More »

linux 系统 rcu_bh self-detected stall 问题处理

By | 2019-04-26

问题说明 近期几台 linux 机器都报了以下 kernel 提示: Apr 24 21:02:09 cztest kernel: INFO: rcu_bh self-detected stall on CPU { 0} (t=0 jiffies) Apr 24 21:02:09 cztest kernel: Pid: 0, comm: swapper/0 Not tainted 3.4.95.R620.CentOS6.5-x86_64.OpenBeta.KVM #1 Apr 24 21:02:09 cztest kernel: Call Trace: Apr 24 21:02:09 cztest kernel: <IRQ> [<ffffffff810bbca2>] __rcu_pending+0x192/0x4e0 Apr 24 21:02:09 cztest kernel: [<ffffffff810a1e70>]… Read More »

linux 系统 xfs_vm_releasepage 警告问题处理

By | 2019-03-27

问题说明 最近的几台机器在同一天的不同时段都出现以下警告信息: Mar 26 20:55:03 host1 kernel: WARNING: at fs/xfs/xfs_aops.c:1045 xfs_vm_releasepage+0xcb/0x100 [xfs]() Mar 26 20:55:03 host1 kernel: Modules linked in: nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack iptable_filter ip_tables ebtable_filter ebtables ip6table_ filter ip6_tables devlink bridge stp llc xt_multiport sunrpc dm_mirror dm_region_hash dm_log dm_mod intel_powerclamp coretemp intel_rapl iosf_mbi kvm_intel kvm irqbypa ss crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper… Read More »

cve-2016-5195 漏洞处理说明

By | 2016-10-21

详见以下链接: cve-2016-5195 360 bobao redhat mitigation 漏洞影响描述: A race condition was found in the way Linux kernel’s memory subsystem handled breakage of the read only private mappings COW situation on write access. An unprivileged local user could use this flaw to gain write access to otherwise read only memory mappings and thus increase their privileges… Read More »