Kyle McMartin wrote on 31.05.2010 18:12: > https://koji.fedoraproject.org/koji/taskinfo?taskID=2219923 > > New build posted with updated DRM and forward ports of the iwlwifi > patches from F-13. It's running mostly well for me on two machines. But I get one infos and lot's of warnings on one machine. The info comes quite early during boot: > [...] > ACPI: Core revision 20100121 > ftrace: converting mcount calls to 0f 1f 44 00 00 > ftrace: allocating 20930 entries in 83 pages > Setting APIC routing to flat > ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1 > CPU0: Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz stepping 05 > > =================================================== > [ INFO: suspicious rcu_dereference_check() usage. ] > --------------------------------------------------- > include/linux/cgroup.h:534 invoked rcu_dereference_check() without protection! > > other info that might help us debug this: > > > rcu_scheduler_active = 1, debug_locks = 0 > no locks held by watchdog/0/5. > > stack backtrace: > Pid: 5, comm: watchdog/0 Not tainted 2.6.34-14.fc13.x86_64 #1 > Call Trace: > [<ffffffff8107bf96>] lockdep_rcu_dereference+0xaa/0xb3 > [<ffffffff8103ecff>] task_subsys_state+0x4e/0x65 > [<ffffffff81048974>] __sched_setscheduler+0x1a2/0x305 > [<ffffffff81480c5d>] ? schedule+0x5eb/0x653 > [<ffffffff81483401>] ? _raw_read_lock+0x62/0x6e > [<ffffffff810ac6cf>] ? watchdog+0x0/0x91 > [<ffffffff81048afc>] sched_setscheduler+0x13/0x15 > [<ffffffff810ac6fe>] watchdog+0x2f/0x91 > [<ffffffff810ac6cf>] ? watchdog+0x0/0x91 > [<ffffffff8106a9b4>] kthread+0x9a/0xa2 > [<ffffffff8107c8e0>] ? trace_hardirqs_on_caller+0x111/0x135 > [<ffffffff8100aae4>] kernel_thread_helper+0x4/0x10 > [<ffffffff814837d0>] ? restore_args+0x0/0x30 > [<ffffffff8106a91a>] ? kthread+0x0/0xa2 > [<ffffffff8100aae0>] ? kernel_thread_helper+0x0/0x10 > lockdep: fixing up alternatives. > Booting Node 0, Processors #1lockdep: fixing up alternatives. > #2lockdep: fixing up alternatives. > #3 > Brought up 4 CPUs > Total of 4 processors activated (21274.14 BogoMIPS). > [...] The warning comes later when I mount a CIFS share using mount.cifs: > SELinux: initialized (dev cifs, type cifs), uses genfs_contexts > ------------[ cut here ]------------ > WARNING: at fs/fs-writeback.c:589 writeback_inodes_wb+0x1d0/0x3ca() > Hardware name: Studio XPS 8000 > Modules linked in: nls_utf8 cifs fuse ipt_MASQUERADE iptable_nat nf_nat bridge stp llc nfsd lockd nfs_acl auth_rpcgss exportfs sunrpc cpufreq_ondemand acpi_cpufreq freq_table xt_physdev ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_t > ables ipv6 kvm_intel kvm uinput snd_hda_codec_atihdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm broadcom snd_timer tg3 snd serio_raw soundcore iTCO_wdt i2c_i801 snd_page_alloc dcdbas micro > code iTCO_vendor_support firewire_ohci firewire_core crc_itu_t usb_storage radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: scsi_wait_scan] > Pid: 1316, comm: flush-253:2 Not tainted 2.6.34-14.fc13.x86_64 #1 > Call Trace: > [<ffffffff81050430>] warn_slowpath_common+0x7c/0x94 > [<ffffffff8105045c>] warn_slowpath_null+0x14/0x16 > [<ffffffff8113daf0>] writeback_inodes_wb+0x1d0/0x3ca > [<ffffffff8113de35>] wb_writeback+0x14b/0x1d2 > [<ffffffff810b1185>] ? call_rcu_sched+0x15/0x17 > [<ffffffff810b1195>] ? call_rcu+0xe/0x10 > [<ffffffff8113dfe7>] wb_do_writeback+0x74/0x19a > [<ffffffff8113e003>] ? wb_do_writeback+0x90/0x19a > [<ffffffff8113e14c>] bdi_writeback_task+0x3f/0xb0 > [<ffffffff810f15a0>] ? bdi_start_fn+0x0/0xdc > [<ffffffff810f1616>] bdi_start_fn+0x76/0xdc > [<ffffffff810f15a0>] ? bdi_start_fn+0x0/0xdc > [<ffffffff8106a9b4>] kthread+0x9a/0xa2 > [<ffffffff8100aae4>] kernel_thread_helper+0x4/0x10 > [<ffffffff814837d0>] ? restore_args+0x0/0x30 > [<ffffffff8106a91a>] ? kthread+0x0/0xa2 > [<ffffffff8100aae0>] ? kernel_thread_helper+0x0/0x10 > ---[ end trace d2b88eb54b570740 ]--- > ------------[ cut here ]------------ Later I get lot's of similar warnings: > WARNING: at fs/fs-writeback.c:589 writeback_inodes_wb+0x1d0/0x3ca() > Hardware name: Studio XPS 8000 > Modules linked in: nls_utf8 cifs fuse ipt_MASQUERADE iptable_nat nf_nat bridge stp llc nfsd lockd nfs_acl auth_rpcgss exportfs sunrpc cpufreq_ondemand acpi_cpufreq freq_table xt_physdev ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_tables ipv6 kvm_intel kvm uinput snd_hda_codec_atihdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm broadcom snd_timer tg3 snd serio_raw soundcore iTCO_wdt i2c_i801 snd_page_alloc dcdbas microcode iTCO_vendor_support firewire_ohci firewire_core crc_itu_t usb_storage radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: scsi_wait_scan] > Pid: 1316, comm: flush-253:2 Tainted: G W 2.6.34-14.fc13.x86_64 #1 > Call Trace: > [<ffffffff81050430>] warn_slowpath_common+0x7c/0x94 > [<ffffffff8105045c>] warn_slowpath_null+0x14/0x16 > [<ffffffff8113daf0>] writeback_inodes_wb+0x1d0/0x3ca > [<ffffffff8113de35>] wb_writeback+0x14b/0x1d2 > [<ffffffff810b1185>] ? call_rcu_sched+0x15/0x17 > [<ffffffff810b1195>] ? call_rcu+0xe/0x10 > [<ffffffff8113dfe7>] wb_do_writeback+0x74/0x19a > [<ffffffff8113e003>] ? wb_do_writeback+0x90/0x19a > [<ffffffff8113e14c>] bdi_writeback_task+0x3f/0xb0 > [<ffffffff810f15a0>] ? bdi_start_fn+0x0/0xdc > [<ffffffff810f1616>] bdi_start_fn+0x76/0xdc > [<ffffffff810f15a0>] ? bdi_start_fn+0x0/0xdc > [<ffffffff8106a9b4>] kthread+0x9a/0xa2 > [<ffffffff8100aae4>] kernel_thread_helper+0x4/0x10 > [<ffffffff814837d0>] ? restore_args+0x0/0x30 > [<ffffffff8106a91a>] ? kthread+0x0/0xa2 > [<ffffffff8100aae0>] ? kernel_thread_helper+0x0/0x10 > ---[ end trace d2b88eb54b570741 ]--- > ------------[ cut here ]------------ Want a bug or is this expect for now or known already? 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