| Summary: | infiniband: INFO: suspicious rcu_dereference_check() usage | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Jay Fenlason <fenlason> |
| Component: | kernel | Assignee: | Kernel Maintainer List <kernel-maint> |
| Status: | CLOSED RAWHIDE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | low | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | rawhide | CC: | gansalmon, itamar, jfeeney, jonathan, kernel-maint, madhu.chinakonda |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-12-06 16:54:32 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
I recommend just telling upstream about it. Infiniband gets basically zero attention in Fedora. should be fixed in commit 580da35a31f91a594f3090b7a2c39b85cb051a12 |
Description of problem: I was trying out my QDR Infiniband hardware when this showed up on my console 709.600148] =================================================== [ 709.600331] [ INFO: suspicious rcu_dereference_check() usage. ] [ 709.600434] --------------------------------------------------- [ 709.600538] include/net/dst.h:91 invoked rcu_dereference_check() without protection! [ 709.600674] [ 709.600675] other info that might help us debug this: [ 709.600676] [ 709.600939] [ 709.600940] rcu_scheduler_active = 1, debug_locks = 0 [ 709.601120] 4 locks held by kworker/u:5/115: [ 709.601211] #0: ((name)){.+.+.+}, at: [<ffffffff81075b25>] process_one_work+0x14d/0x3e7 [ 709.601558] #1: ((&port_priv->work)){+.+.+.}, at: [<ffffffff81075b25>] process_one_work+0x14d/0x3e7 [ 709.601972] #2: (rcu_read_lock_bh){.+....}, at: [<ffffffff81418e24>] dev_queue_xmit+0x0/0x618 [ 709.602336] #3: (_xmit_INFINIBAND#2){+.-...}, at: [<ffffffff814310d6>] sch_direct_xmit+0x4e/0x14e [ 709.602766] [ 709.602767] stack backtrace: [ 709.602968] Pid: 115, comm: kworker/u:5 Tainted: G W 3.1.0-0.rc8.git0.0.fc17.x86_64 #1 [ 709.603095] Call Trace: [ 709.603176] [<ffffffff8108caef>] lockdep_rcu_dereference+0xa7/0xaf [ 709.603293] [<ffffffffa03d9a0d>] dst_get_neighbour+0x52/0x5a [ib_ipoib] [ 709.603414] [<ffffffffa03da568>] ipoib_start_xmit+0x3a/0x3b8 [ib_ipoib] [ 709.603531] [<ffffffff8108efbf>] ? lock_release+0x1b1/0x1de [ 709.603655] [<ffffffff81418cef>] dev_hard_start_xmit+0x44f/0x584 [ 709.603774] [<ffffffff814310fa>] sch_direct_xmit+0x72/0x14e [ 709.603911] [<ffffffff81419219>] dev_queue_xmit+0x3f5/0x618 [ 709.604048] [<ffffffff81418e24>] ? dev_hard_start_xmit+0x584/0x584 [ 709.604162] [<ffffffff8108f527>] ? trace_hardirqs_on_caller+0x121/0x158 [ 709.604282] [<ffffffffa03da293>] path_rec_completion+0x30d/0x35e [ib_ipoib] [ 709.604405] [<ffffffffa0192000>] ib_sa_path_rec_callback+0x51/0x75 [ib_sa] [ 709.604526] [<ffffffffa019133b>] recv_handler+0x41/0x4d [ib_sa] [ 709.604657] [<ffffffffa013dd7e>] ib_mad_completion_handler+0x44d/0x643 [ib_mad] [ 709.604789] [<ffffffff8108b951>] ? trace_hardirqs_off+0xd/0xf [ 709.604932] [<ffffffffa013d931>] ? ib_mad_send_done_handler+0x157/0x157 [ib_mad] [ 709.605085] [<ffffffff81075bdd>] process_one_work+0x205/0x3e7 [ 709.605195] [<ffffffff81075b25>] ? process_one_work+0x14d/0x3e7 [ 709.605305] [<ffffffff8108cfb7>] ? lock_acquired+0x210/0x243 [ 709.605413] [<ffffffff8107688b>] worker_thread+0xda/0x15d [ 709.605518] [<ffffffff810767b1>] ? manage_workers+0x176/0x176 [ 709.605641] [<ffffffff8107a251>] kthread+0xa8/0xb0 [ 709.605748] [<ffffffff8150de84>] kernel_thread_helper+0x4/0x10 [ 709.605883] [<ffffffff815052f4>] ? retint_restore_args+0x13/0x13 [ 709.606047] [<ffffffff8107a1a9>] ? __init_kthread_worker+0x5a/0x5a [ 709.606164] [<ffffffff8150de80>] ? gs_change+0x13/0x13 Version-Release number of selected component (if applicable): 3.1.0-0.rc8.git0.fc17 How reproducible: Haven't tried. Steps to Reproduce: 1.Install a QLogic dual-port QDR Infiniband card 2.Have one cable fully connected, the other not quite pushed in all the way 3.boot and configure ib0 and ib1 4.Notice the not-quite-plugged-in cable, plug it in Actual results: Messages about RCU on console Expected results: No messages Additional info: