On Fri, Mar 22, 2013 at 09:52:29PM +0530, Viresh Kumar wrote: > What does "?" mean before a functions name in trace? http://stackoverflow.com/questions/13113384/the-meaning-of-in-linux-kernel-panic-call-trace Here's what's in dmesg before that (basically the machine is hibernating): Mar 20 10:14:40 pd vmunix: [34172.600018] PM: Syncing filesystems ... done. Mar 20 10:14:40 pd vmunix: [34172.606180] Freezing user space processes ... (elapsed 0.01 seconds) done. Mar 20 10:14:40 pd vmunix: [34172.620559] PM: Preallocating image memory... done (allocated 573862 pages) Mar 20 10:14:40 pd vmunix: [34173.370592] PM: Allocated 2295448 kbytes in 0.75 seconds (3060.59 MB/s) Mar 20 10:14:40 pd vmunix: [34173.370615] Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done. Mar 20 10:14:40 pd vmunix: [34173.388082] serial 00:09: disabled Mar 20 10:14:40 pd vmunix: [34173.388117] serial 00:09: System wakeup disabled by ACPI Mar 20 10:14:40 pd vmunix: [34173.695941] PM: freeze of devices complete after 311.852 msecs Mar 20 10:14:40 pd vmunix: [34173.696673] PM: late freeze of devices complete after 0.722 msecs Mar 20 10:14:40 pd vmunix: [34173.698914] PM: noirq freeze of devices complete after 2.234 msecs Mar 20 10:14:40 pd vmunix: [34173.698932] Disabling non-boot CPUs ... Mar 20 10:14:40 pd vmunix: [34173.703351] smpboot: CPU 1 is now offline Mar 20 10:14:40 pd vmunix: [34173.708298] smpboot: CPU 2 is now offline Mar 20 10:14:40 pd vmunix: [34173.712056] smpboot: CPU 3 is now offline Mar 20 10:14:40 pd vmunix: [34173.717512] smpboot: CPU 4 is now offline Mar 20 10:14:40 pd vmunix: [34173.722044] smpboot: CPU 5 is now offline Mar 20 10:14:40 pd vmunix: [34173.728418] smpboot: CPU 6 is now offline Mar 20 10:14:40 pd vmunix: [34173.731577] smpboot: CPU 7 is now offline Mar 20 10:14:40 pd vmunix: [34173.732828] PM: Creating hibernation image: Mar 20 10:14:40 pd vmunix: [34174.371451] PM: Need to copy 596216 pages Mar 20 10:14:40 pd vmunix: [34173.879106] Enabling non-boot CPUs ... Mar 20 10:14:40 pd vmunix: [34173.879171] SMP alternatives: lockdep: fixing up alternatives Mar 20 10:14:40 pd vmunix: [34173.879182] smpboot: Booting Node 0 Processor 1 APIC 0x11 Mar 20 10:14:40 pd vmunix: [34173.890627] LVT offset 0 assigned for vector 0x400 Mar 20 10:14:40 pd vmunix: [34173.893305] ------------[ cut here ]------------ Mar 20 10:14:40 pd vmunix: [34173.893321] WARNING: at kernel/mutex.c:199 mutex_lock_nested+0x39c/0x3b0() Mar 20 10:14:40 pd vmunix: [34173.893328] Hardware name: To be filled by O.E.M. Mar 20 10:14:40 pd vmunix: [34173.893333] Modules linked in: nls_iso8859_15 nls_cp437 fuse tun cpufreq_powersave cpufreq_userspace cpufreq_stats cpufreq_conservative dm_crypt dm_mod ipv6 vfat fat acpi_cpufreq mperf kvm_amd kvm crc32_pclmul aesni_intel aes_x86_64 ablk_helper cryptd xts lrw gf128mul microcode radeon amd64_edac_mod edac_core k10temp fam15h_power drm_kms_helper ttm cfbfillrect cfbimgblt r8169 cfbcopyarea Mar 20 10:14:40 pd vmunix: [34173.893395] Pid: 15316, comm: kworker/0:0 Not tainted 3.9.0-rc3 #1 Mar 20 10:14:40 pd vmunix: [34173.893402] Call Trace: Mar 20 10:14:40 pd vmunix: [34173.893409] [<ffffffff8103b33f>] warn_slowpath_common+0x7f/0xc0 Mar 20 10:14:40 pd vmunix: [34173.893417] [<ffffffff8103b39a>] warn_slowpath_null+0x1a/0x20 Mar 20 10:14:40 pd vmunix: [34173.893424] [<ffffffff8159654c>] mutex_lock_nested+0x39c/0x3b0 Mar 20 10:14:40 pd vmunix: [34173.893432] [<ffffffff8144b94d>] ? cpufreq_governor_dbs+0x3bd/0x560 Mar 20 10:14:40 pd vmunix: [34173.893441] [<ffffffff8106bded>] ? __blocking_notifier_call_chain+0x7d/0xd0 Mar 20 10:14:40 pd vmunix: [34173.893449] [<ffffffff8144b94d>] ? cpufreq_governor_dbs+0x3bd/0x560 Mar 20 10:14:40 pd vmunix: [34173.893457] [<ffffffff81074ce1>] ? get_parent_ip+0x11/0x50 Mar 20 10:14:40 pd vmunix: [34173.893464] [<ffffffff81074d99>] ? sub_preempt_count+0x79/0xd0 Mar 20 10:14:40 pd vmunix: [34173.893472] [<ffffffff8144b94d>] cpufreq_governor_dbs+0x3bd/0x560 Mar 20 10:14:40 pd vmunix: [34173.893480] [<ffffffff8144b24a>] od_cpufreq_governor_dbs+0x1a/0x20 Mar 20 10:14:40 pd vmunix: [34173.893487] [<ffffffff81448f13>] __cpufreq_governor+0x53/0xf0 Mar 20 10:14:40 pd vmunix: [34173.893494] [<ffffffff814494a5>] __cpufreq_set_policy+0x155/0x180 Mar 20 10:14:40 pd vmunix: [34173.893502] [<ffffffff8144a483>] cpufreq_update_policy+0xf3/0x130 Mar 20 10:14:40 pd vmunix: [34173.893510] [<ffffffff8144a4c0>] ? cpufreq_update_policy+0x130/0x130 Mar 20 10:14:40 pd vmunix: [34173.893519] [<ffffffff8144a4d1>] handle_update+0x11/0x20 Mar 20 10:14:40 pd vmunix: [34173.893526] [<ffffffff8105f3f7>] process_one_work+0x1f7/0x670 Mar 20 10:14:40 pd vmunix: [34173.893533] [<ffffffff8105f38c>] ? process_one_work+0x18c/0x670 Mar 20 10:14:40 pd vmunix: [34173.893541] [<ffffffff8105fbfe>] worker_thread+0x10e/0x370 Mar 20 10:14:40 pd vmunix: [34173.893548] [<ffffffff8105faf0>] ? rescuer_thread+0x240/0x240 Mar 20 10:14:40 pd vmunix: [34173.893556] [<ffffffff810654fb>] kthread+0xdb/0xe0 Mar 20 10:14:40 pd vmunix: [34173.893563] [<ffffffff81071ba5>] ? finish_task_switch+0x85/0x110 Mar 20 10:14:40 pd vmunix: [34173.893572] [<ffffffff81065420>] ? __init_kthread_worker+0x70/0x70 Mar 20 10:14:40 pd vmunix: [34173.893579] [<ffffffff8159a71c>] ret_from_fork+0x7c/0xb0 Mar 20 10:14:40 pd vmunix: [34173.893587] [<ffffffff81065420>] ? __init_kthread_worker+0x70/0x70 Mar 20 10:14:40 pd vmunix: [34173.893594] ---[ end trace 66f5addf492b41b2 ]--- HTH. -- Regards/Gruss, Boris. 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