linux-next: runtime warning after merge of the cel-fixes tree

From: Stephen Rothwell <sfr@canb.auug.org.au>
To: Chuck Lever <chuck.lever@oracle.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux Next Mailing List <linux-next@vger.kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>
Subject: linux-next: runtime warning after merge of the cel-fixes tree
Date: Thu, 7 Apr 2022 14:45:24 +1000	[thread overview]
Message-ID: <20220407144524.2a592ed6@canb.auug.org.au> (raw)

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Hi all,

After merging the cel-fixes tree, today's linux-next build (powerpc
pseries_le_defconfig) produced this warning:

ftrace: allocating 33539 entries in 13 pages
ftrace: allocated 13 pages with 3 groups
trace event string verifier disabled
rcu: Hierarchical RCU implementation.
rcu: 	RCU event tracing is enabled.
rcu: 	RCU restricting CPUs from NR_CPUS=2048 to nr_cpu_ids=1.
	Rude variant of Tasks RCU enabled.
	Tracing variant of Tasks RCU enabled.
rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
------------[ cut here ]------------
WARNING: CPU: 0 PID: 0 at kernel/trace/trace_events.c:431 trace_event_raw_init+0x1a4/0x7d0
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.18.0-rc1 #2
NIP:  c0000000002c0924 LR: c0000000002c0ce8 CTR: c0000000002c0990
REGS: c000000002787a00 TRAP: 0700   Not tainted  (5.18.0-rc1)
MSR:  8000000002021033 <SF,VEC,ME,IR,DR,RI,LE>  CR: 44000282  XER: 20000000
CFAR: c0000000002c0b34 IRQMASK: 1 
GPR00: c0000000002c0cd0 c000000002787ca0 c00000000278ae00 0000000000000000 
GPR04: 000000000000002c 0000000000000005 0000000000000057 c0000000002c08ac 
GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
GPR12: c0000000002c0780 c000000002950000 0000000000000003 0000000000000000 
GPR16: 0000000002bf00d0 000000007e68ebc8 c000000000fb0758 000508b58019388f 
GPR20: 0000000000000000 0000000000000001 c000000000fb0748 0000000000000003 
GPR24: 0000000000000000 0000000000000000 0000000000000001 0000000000000000 
GPR28: c0000000026fcde0 c0000000026f60e0 000000000000005f c0000000026f613f 
NIP [c0000000002c0924] trace_event_raw_init+0x1a4/0x7d0
LR [c0000000002c0ce8] trace_event_raw_init+0x568/0x7d0
Call Trace:
[c000000002787ca0] [c0000000002c0cd0] trace_event_raw_init+0x550/0x7d0 (unreliable)
[c000000002787da0] [c0000000002bd908] event_init+0x78/0x100
[c000000002787e10] [c0000000020346ac] trace_event_init+0xc8/0x334
[c000000002787eb0] [c000000002033d20] trace_init+0x18/0x2c
[c000000002787ed0] [c000000002004318] start_kernel+0x598/0x8d8
[c000000002787f90] [c00000000000d19c] start_here_common+0x1c/0x600
Instruction dump:
41800348 60000000 60420000 3bde0001 7fdf07b4 7ffdfa14 891f0000 710a00ff 
4082ff5c 2c3a0000 38600000 41820230 <0fe00000> f9c10070 f9e10078 fa010080 
---[ end trace 0000000000000000 ]---
event svc_defer_recv has unsafe dereference of argument 1
print_fmt: "addr=%pISpc dr=%p xid=0x%08x", (struct sockaddr *)__get_dynamic_array(addr), REC->dr, REC->xid
event svc_defer_queue has unsafe dereference of argument 1
print_fmt: "addr=%pISpc dr=%p xid=0x%08x", (struct sockaddr *)__get_dynamic_array(addr), REC->dr, REC->xid
event svc_defer_drop has unsafe dereference of argument 1
print_fmt: "addr=%pISpc dr=%p xid=0x%08x", (struct sockaddr *)__get_dynamic_array(addr), REC->dr, REC->xid
NR_IRQS: 512, nr_irqs: 512, preallocated irqs: 16
rcu: srcu_init: Setting srcu_struct sizes based on contention.

Introduced by commit

  e2e917f8677d ("SUNRPC: Fix the svc_deferred_event trace class")

At least reverting that commit makes the warning go away.

I have left that commit reverted for today.

-- 
Cheers,
Stephen Rothwell

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