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Subject3.15 drivers/net/ethernet/broadcom/cnic.c:576 suspicious rcu_dereference_check() usage!
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Hi All,

We've had a report [1] of the bnx2i/cnic driver(s) throwing suspicious
RCU usage with 3.15 merge window kernels on an i686 machine. This
corresponds to Linux v3.14-12812-g321d03c86732. I've included the
dump below.

Has anyone seen this issue before?

josh

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1087813

[ 90.432418] ===============================
[ 90.511920] [ INFO: suspicious RCU usage. ]
[ 90.511922] 3.15.0-0.rc0.git13.1.fc21.i686 #1 Not tainted
[ 90.511922] -------------------------------
[ 90.511923] drivers/net/ethernet/broadcom/cnic.c:576 suspicious
rcu_dereference_check() usage!
[ 90.511923]
[ 90.511923] other info that might help us debug this:
[ 90.511923]
[ 90.511924]
[ 90.511924] rcu_scheduler_active = 1, debug_locks = 0
[ 90.511925] 3 locks held by anaconda/1320:
[ 90.511932] #0: (rtnl_mutex){+.+.+.}, at: [<c09c6474>] rtnl_lock+0x14/0x20
[ 90.511937] #1: (&bnx2i_dev_lock){+.+...}, at: [<f80d45df>]
bnx2i_ulp_init+0x2f/0x140 [bnx2i]
[ 90.511940] #2: (cnic_lock){+.+...}, at: [<f80c8328>]
cnic_register_device+0x38/0x2d0 [cnic]
[ 90.511941]
[ 90.511941] stack backtrace:
[ 90.511942] CPU: 3 PID: 1320 Comm: anaconda Not tainted
3.15.0-0.rc0.git13.1.fc21.i686 #1
[ 90.511943] Hardware name: HP ProLiant DL360 G7, BIOS P68 01/28/2011
[ 90.511946] 00000000 2cd0aecd 00000000 dc0d3cf4 c0ae271d 00000001
dc0d3d1c c04ac226
[ 90.511948] c0cb548e c0cdb161 00000001 00000000 dc160000 00000001
ec75a2c0 ec75a32c
[ 90.511950] dc0d3d90 f80c8442 00000003 f80d45df 00000001 df49393c
00000000 ec75a330
[ 90.511951] Call Trace:
[ 90.511956] [<c0ae271d>] dump_stack+0x48/0x60
[ 90.511959] [<c04ac226>] lockdep_rcu_suspicious+0xd6/0x100
[ 90.511961] [<f80c8442>] cnic_register_device+0x152/0x2d0 [cnic]
[ 90.511967] [<f80d45df>] ? bnx2i_ulp_init+0x2f/0x140 [bnx2i]
[ 90.511969] [<c04add2b>] ? trace_hardirqs_on+0xb/0x10
[ 90.511972] [<f80d45df>] ? bnx2i_ulp_init+0x2f/0x140 [bnx2i]
[ 90.511974] [<f80d45df>] ? bnx2i_ulp_init+0x2f/0x140 [bnx2i]
[ 90.511977] [<f80d45f9>] bnx2i_ulp_init+0x49/0x140 [bnx2i]
[ 90.511979] [<f80c65e1>] cnic_register_driver+0xe1/0x180 [cnic]
[ 90.511982] [<f7d93000>] ? 0xf7d92fff
[ 90.511984] [<f7d9308b>] bnx2i_mod_init+0x8b/0x1000 [bnx2i]
[ 90.511986] [<f7d93000>] ? 0xf7d92fff
[ 90.511988] [<c040049a>] do_one_initcall+0xca/0x1a0
[ 90.511990] [<f7d93000>] ? 0xf7d92fff
[ 90.511992] [<c0445777>] ? set_memory_ro+0x37/0x40
[ 90.511995] [<c04e3b96>] load_module+0x1fe6/0x2480
[ 90.511999] [<c04dfb99>] ? copy_module_from_fd.isra.45+0x109/0x1a0
[ 90.512001] [<c04e41ed>] SyS_finit_module+0x8d/0xd0
[ 90.512003] [<c04a97ab>] ? up_write+0x1b/0x30
[ 90.512005] [<c056defb>] ? vm_mmap_pgoff+0x9b/0xc0
[ 90.512010] [<c0af39df>] sysenter_do_call+0x12/0x38
[ 90.512012] [<c0ae0000>] ? mtrr_check.part.2+0x32/0x57
[ 90.512304] bnx2i [04:00.01]: ISCSI_INIT passed
[ 155.484180] INFO: rcu_sched detected stalls on CPUs/tasks: {}
(detected by 7, t=65099 jiffies, g=4371, c=4370, q=172)
[ 155.634698] INFO: Stall ended before state dump start
[-- MARK -- Tue Apr 15 09:30:01 2014]


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