https://bugzilla.kernel.org/show_bug.cgi?id=216388 --- Comment #9 from Robert Dinse (nanook@xxxxxxxxxx) --- I spent some time digging through web server logs, these are the logs from the machine that produced the last three CPU stall messages, but this time the stall occurred on apache2, this is cool because that is something I can readily test. Here is the stall message: Sep 1 14:26:53 ftp kernel: [ 18.819394][ T298] rcu: INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 3-... } 4 jiffies s: 441 root: 0x8/. Sep 1 14:26:53 ftp kernel: [ 18.819413][ T298] rcu: blocking rcu_node structures (internal RCU debug): Sep 1 14:26:53 ftp kernel: [ 18.819417][ T298] Task dump for CPU 3: Sep 1 14:26:53 ftp kernel: [ 18.819418][ T298] task:httpd state:R running task stack: 0 pid: 2798 ppid: 2460 flags:0x0000400a Sep 1 14:26:53 ftp kernel: [ 18.819424][ T298] Call Trace: Sep 1 14:26:53 ftp kernel: [ 18.819428][ T298] <TASK> Sep 1 14:26:53 ftp kernel: [ 18.819437][ T298] ? alloc_pages+0x90/0x1a0 Sep 1 14:26:53 ftp kernel: [ 18.819443][ T298] ? allocate_slab+0x274/0x460 Sep 1 14:26:53 ftp kernel: [ 18.819445][ T298] ? xa_load+0xa6/0xc0 Sep 1 14:26:53 ftp kernel: [ 18.819448][ T298] ? ___slab_alloc.constprop.0+0x50b/0x5f0 Sep 1 14:26:53 ftp kernel: [ 18.819451][ T298] ? kmem_cache_alloc_lru+0x297/0x360 Sep 1 14:26:53 ftp kernel: [ 18.819456][ T298] ? nfs_find_actor+0x90/0x90 [nfs] Sep 1 14:26:53 ftp kernel: [ 18.819504][ T298] ? nfs_alloc_inode+0x21/0x60 [nfs] Sep 1 14:26:53 ftp kernel: [ 18.819519][ T298] ? alloc_inode+0x23/0xc0 Sep 1 14:26:53 ftp kernel: [ 18.819526][ T298] ? nfs_alloc_fhandle+0x30/0x30 [nfs] Sep 1 14:26:53 ftp kernel: [ 18.819541][ T298] ? iget5_locked+0x53/0xa0 Sep 1 14:26:53 ftp kernel: [ 18.819543][ T298] ? list_lru_add+0x13f/0x190 Sep 1 14:26:53 ftp kernel: [ 18.819547][ T298] ? nfs_fhget+0xd2/0x6d0 [nfs] Sep 1 14:26:53 ftp kernel: [ 18.819570][ T298] ? nfs_readdir_entry_decode+0x31e/0x440 [nfs] Sep 1 14:26:53 ftp kernel: [ 18.819581][ T298] ? nfs_readdir_page_filler+0x10d/0x4f0 [nfs] Sep 1 14:26:53 ftp kernel: [ 18.819592][ T298] ? nfs_readdir_xdr_to_array+0x45e/0x4a0 [nfs] Sep 1 14:26:53 ftp kernel: [ 18.819602][ T298] ? nfs_readdir+0x2e6/0xea0 [nfs] Sep 1 14:26:53 ftp kernel: [ 18.819613][ T298] ? iterate_dir+0x9b/0x1d0 Sep 1 14:26:53 ftp kernel: [ 18.819615][ T298] ? __x64_sys_getdents64+0x84/0x120 Sep 1 14:26:53 ftp kernel: [ 18.819616][ T298] ? __ia32_sys_getdents64+0x120/0x120 Sep 1 14:26:53 ftp kernel: [ 18.819618][ T298] ? do_syscall_64+0x5b/0x80 Sep 1 14:26:53 ftp kernel: [ 18.819620][ T298] ? do_user_addr_fault+0x1c1/0x620 Sep 1 14:26:53 ftp kernel: [ 18.819622][ T298] ? exit_to_user_mode_prepare+0x41/0x1e0 Sep 1 14:26:53 ftp kernel: [ 18.819625][ T298] ? irqentry_exit_to_user_mode+0x9/0x30 Sep 1 14:26:53 ftp kernel: [ 18.819626][ T298] ? irqentry_exit+0x1d/0x30 Sep 1 14:26:53 ftp kernel: [ 18.819627][ T298] ? exc_page_fault+0x86/0x160 Sep 1 14:26:53 ftp kernel: [ 18.819628][ T298] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd Sep 1 14:26:53 ftp kernel: [ 18.819631][ T298] </TASK> Now that process is gone, but the parent process is still running and Apache still seems to be responding fine. Checking the error log, there were no errors with that PID. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
