linux-kernel - Re: 2.6.23-rc2-mm1: sleeping function called from invalid context at kernel/mutex.c:86

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Message-Id: <200708100123.07762.m.kozlowski@tuxland.pl>
Date:	Fri, 10 Aug 2007 01:23:07 +0200
From:	Mariusz Kozlowski <m.kozlowski@...land.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>, josh@...edesktop.org
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.23-rc2-mm1: sleeping function called from invalid context at kernel/mutex.c:86

Hello,

	This probably doesn't have great impact ;) but ...
To reproduce: run torture tests for RCU and then sysrq+q.

SysRq : Show Pending Timers
Timer List Version: v0.3
HRTIMER_MAX_CLOCK_BASES: 2
now at 1764338760370 nsecs

cpu: 0
 clock 0:
  .index:      0
  .resolution: 1 nsecs
  .get_time:   ktime_get_real
  .offset:     1186699025823815427 nsecs
active timers:
 clock 1:
  .index:      1
  .resolution: 1 nsecs
  .get_time:   ktime_get
  .offset:     0 nsecs
active timers:
 #0: <3>BUG: sleeping function called from invalid context at kernel/mutex.c:86
in_atomic():1, irqs_disabled():1
INFO: lockdep is turned off.
irq event stamp: 0
hardirqs last  enabled at (0): [<00000000>] 0x0
hardirqs last disabled at (0): [<c0117def>] copy_process+0x4a8/0x144c
softirqs last  enabled at (0): [<c0117e0d>] copy_process+0x4c6/0x144c
softirqs last disabled at (0): [<00000000>] 0x0
 [<c0104869>] show_trace_log_lvl+0x1a/0x30
 [<c01053ad>] show_trace+0x12/0x14
 [<c0105515>] dump_stack+0x15/0x17
 [<c0114da7>] __might_sleep+0xb7/0xc9
 [<c0451771>] mutex_lock+0x15/0x1f
 [<c0141b75>] lookup_module_symbol_name+0x17/0xc0
 [<c014272a>] lookup_symbol_name+0x3f/0x43
 [<c013287e>] print_name_offset+0x1f/0x96
 [<c01330f7>] timer_list_show+0x802/0xcbd
 [<c01335be>] sysrq_timer_list_show+0xc/0xe
 [<c02cc4a1>] sysrq_handle_show_timers+0x8/0xa
 [<c02cc3ac>] __handle_sysrq+0x7b/0x115
 [<c02cc466>] handle_sysrq+0x20/0x24
 [<c02c69c1>] kbd_event+0x3a8/0x5c7
 [<c0362f8f>] input_pass_event+0x8f/0x91
 [<c0363e77>] input_handle_event+0x98/0x38d
 [<c0364e6d>] input_event+0x54/0x67
 [<c03682c2>] atkbd_interrupt+0x200/0x59e
 [<c0360cd0>] serio_interrupt+0x7c/0x80
 [<c0361965>] i8042_interrupt+0x17a/0x289
 [<c0147a5d>] handle_IRQ_event+0x28/0x59
 [<c01493ca>] handle_level_irq+0xad/0x10b
 [<c0105a13>] do_IRQ+0x93/0xd0
 [<c010441e>] common_interrupt+0x2e/0x34
 [<df39d7e3>] rcu_read_delay+0x8/0x36 [rcutorture]
 [<df39d99a>] rcu_torture_reader+0x6e/0x169 [rcutorture]
 [<c012c11e>] kthread+0x36/0x58
 [<c010451b>] kernel_thread_helper+0x7/0x1c
 =======================
<c4ce1d38>, tick_sched_timer, S:01, tick_nohz_restart_sched_tick, swapper/0
 # expires at 1764339000000 nsecs [in 239630 nsecs]
 #1: <c4ce1d38>, it_real_fn, S:01, do_setitimer, artsd/7461
 # expires at 1764742781512 nsecs [in 404021142 nsecs]
 #2: <c4ce1d38>, hrtimer_wakeup, S:01, do_nanosleep, kwrapper/7452
 # expires at 1764922105491 nsecs [in 583345121 nsecs]
 #3: <c4ce1d38>, it_real_fn, S:01, do_setitimer, syslogd/6719
 # expires at 1790027922194 nsecs [in 25689161824 nsecs]
  .expires_next   : 1764339000000 nsecs
  .hres_active    : 1
  .nr_events      : 1422687
  .nohz_mode      : 2
  .idle_tick      : 465859000000 nsecs
  .tick_stopped   : 0
  .idle_jiffies   : 165857
  .idle_calls     : 1812679
  .idle_sleeps    : 1761361
  .idle_entrytime : 466865075138 nsecs
  .idle_sleeptime : 357976883572 nsecs
  .last_jiffies   : 166865
  .next_jiffies   : 166866
  .idle_expires   : 465951000000 nsecs
jiffies: 1464338


Tick Device: mode:     1
Clock Event Device: pit
 max_delta_ns:   27461866
 min_delta_ns:   12571
 mult:           5124677
 shift:          32
 mode:           3
 next_event:     1764339000000 nsecs
 set_next_event: pit_next_event
 set_mode:       init_pit_timer
 event_handler:  hrtimer_interrupt

Regards,

	Mariusz

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