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Date: Sun, 27 Apr 2008 02:36:42 -0400
From: Dan Noe <dpn@...merica.net>
To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: NULL dereference OOPS on SysRq-w
I've experienced the following on a build done today from Linus's
linux-2.6 tree. After a fresh boot I do "echo "w" >
/proc/sysrq_trigger" and I get the OOPS, every time. I looked at the
sched_debug code but I admit I was lost. Not sure why sched.c includes
sched_debug.c.
Cheers,
Dan
Via netconsole:
SysRq : Show Blocked State
task PC stack pid father
Sched Debug Version: v0.07, 2.6.25 #12
now at 275558.648467 msecs
.sysctl_sched_latency : 40.000000
.sysctl_sched_min_granularity : 8.000000
.sysctl_sched_wakeup_granularity : 20.000000
.sysctl_sched_child_runs_first : 0.000001
.sysctl_sched_features : 895
cpu#0, 2194.491 MHz
.nr_running : 3
.load : 3145728
.nr_switches : 13171
.nr_load_updates : 6476
.nr_uninterruptible : -94
.jiffies : 4294961186
.next_balance : 4294.961046
.curr->pid : 3078
.clock : 101239.537371
.idle_clock : 0.000000
.prev_clock_raw : 296931.974646
.clock_warps : 0
.clock_overflows : 12189
.clock_underflows : 4657
.clock_deep_idle_events : 4
.clock_max_delta : 499.306905
.cpu_load[0] : 0
.cpu_load[1] : 96
.cpu_load[2] : 14028
.cpu_load[3] : 62524
.cpu_load[4] : 91704
cfs_rq[0]:
.exec_clock : 400.314576
.MIN_vruntime : 17300.019734
.min_vruntime : 2099676.053218
.max_vruntime : 17300.019734
.spread : 0.000000
.spread0 : 0.000000
.nr_running : 1
.load : 1024
.bkl_count : 353
.nr_spread_over : 44
.shares : 1024
cfs_rq[0]:
.exec_clock : 1.281845
.MIN_vruntime : 0.000001
.min_vruntime : 2099676.053218
.max_vruntime : 0.000001
.spread : 0.000000
.spread0 : 0.000000
.nr_running : 0
.load : 0
.bkl_count : 353
.nr_spread_over : 2
.shares : 0
cfs_rq[0]:
.exec_clock : 13.306219
.MIN_vruntime : 0.000001
.min_vruntime : 2099676.053218
.max_vruntime : 0.000001
.spread : 0.000000
.spread0 : 0.000000
.nr_running : 0
.load : 0
.bkl_count : 353
.nr_spread_over : 3
.shares : 0
cfs_rq[0]:
.exec_clock : 0.380305
.MIN_vruntime : 0.000001
.min_vruntime : 2099676.053218
.max_vruntime : 0.000001
.spread : 0.000000
.spread0 : 0.000000
.nr_running : 0
.load : 0
.bkl_count : 353
.nr_spread_over : 1
.shares : 0
cfs_rq[0]:
.exec_clock : 6.341858
.MIN_vruntime : 0.000001
.min_vruntime : 2099676.053218
.max_vruntime : 0.000001
.spread : 0.000000
.spread0 : 0.000000
.nr_running : 0
.load : 0
.bkl_count : 353
.nr_spread_over : 1
.shares : 0
cfs_rq[0]:
.exec_clock : 6.341858
.MIN_vruntime : 0.000001
.min_vruntime : 2099676.053218
.max_vruntime : 0.000001
.spread : 0.000000
.spread0 : 0.000000
.nr_running : 0
.load : 0
.bkl_count : 353
.nr_spread_over : 16
.shares : 1024
cfs_rq[0]:
.exec_clock : 12850.277817
.MIN_vruntime : 69710.961030
.min_vruntime : 2099676.053218
.max_vruntime : 69751.539537
.spread : 40.578507
.spread0 : 0.000000
.nr_running : 3
.load : 5169 .bkl_count
: 353 .nr_spread_over : 2038 .shares
: 2048BUG: unable to handle kernel NULL pointer dereference at
0000000000000018IP: [<ffffffff802b9ab6>] seq_printf+0x2e/0xa7
PGD 7dd05067 PUD 7e0fb067 PMD 0 Oops: 0000 [1] PREEMPT SMP
DEBUG_PAGEALLOCCPU 0
Modules linked in: netconsole nfsd lockd nfs_acl auth_rpcgss sunrpc
exportfs ac battery ipv6 dm_snapshot dm_mirror dm_log dm_mod eeprom
coretemp loop parport_pc parport snd_hda_intel rtc iTCO_wdt
iTCO_vendor_support i2c_i801 i2c_core snd_pc
m snd_timer snd soundcore snd_page_alloc button intel_agp evdev ext3 jbd
mbcache sd_mod ata_generic ata_piix pata_acpi libata scsi_mod dock
ehci_hcd uhci_hcd ide_pci_generic piix ide_core r8169 usbcore thermal
processor fan
Pid: 3078, comm: zsh Not tainted 2.6.25 #12
RIP: 0010:[<ffffffff802b9ab6>] [<ffffffff802b9ab6>] seq_printf+0x2e/0xa7
RSP: 0018:ffff81007e387c68 EFLAGS: 00010092
RAX: ffffffff804eec79 RBX: 0000000000000000 RCX: ffffee71806668f8
RDX: ffff810001091f80 RSI: ffffffff804eec79 RDI: 0000000000000000
RBP: ffff81007e387d48 R08: 0000000000000002 R09: ffffffff8024fb76
R10: 00000000d59bb5d6 R11: ffff81007e387968 R12: 0000000000000000
R13: 0000000000000000 R14: ffff810001091740 R15: 0000000000000007
FS: 00007f7dce0896e0(0000) GS:ffffffff8057a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000018 CR3: 000000007e3ed000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process zsh (pid: 3078, threadinfo ffff81007e386000, task ffff81007e090000)
Stack: 0000000000000002 ffffffff8024fb76 ffff81007e090090 ffff81007e090000
ffffffff8022dc31 0000000000000046 ffff810001091f80 ffffee71806668f8
0000000000000002 ffffffff8024fb76 0000000000000096 0000000000000000
Call Trace:
[<ffffffff8024fb76>] ? up+0xf/0x39
[<ffffffff8022dc31>] ? print_cfs_rq+0x130/0x465
[<ffffffff8024fb76>] ? up+0xf/0x39
[<ffffffff8041dfa5>] ? _spin_unlock_irqrestore+0x66/0x74
[<ffffffff8022df57>] ? print_cfs_rq+0x456/0x465
[<ffffffff8022e920>] sched_debug_show+0x9ba/0xd28
[<ffffffff8022f978>] ? cpu_clock+0xf0/0xff
[<ffffffff802745fe>] ? get_timestamp+0x9/0xf
[<ffffffff80274628>] ? touch_softlockup_watchdog+0x24/0x2d
[<ffffffff802319ec>] show_state_filter+0x8b/0xaa
[<ffffffff80375848>] sysrq_handle_showstate_blocked+0xe/0x10
[<ffffffff803757a3>] __handle_sysrq+0x9e/0x135
[<ffffffff802e2544>] ? write_sysrq_trigger+0x0/0x3a
[<ffffffff802e2574>] write_sysrq_trigger+0x30/0x3a
[<ffffffff802dc6b2>] proc_reg_write+0x8a/0xa7
[<ffffffff802a0118>] vfs_write+0xa7/0xe1
[<ffffffff802a020c>] sys_write+0x47/0x6d
[<ffffffff8020c3ab>] system_call_after_swapgs+0x7b/0x80
Code: f0 48 89 e5 53 48 89 fb 48 81 ec d8 00 00 00 48 89 95 50 ff ff ff
48 89 8d 58 ff ff ff 4c 89 85 60 ff ff ff 4c 89 8d 68 ff ff ff <48> 8b
7f 18 48 3b 7b 08 73 5a 48 8b 73 08 48 8d 55 10 48 8d 8d
RIP [<ffffffff802b9ab6>] seq_printf+0x2e/0xa7
RSP <ffff81007e387c68>
CR2: 0000000000000018
---[ end trace ffd04a8c8a72749a ]---
note: zsh[3078] exited with preempt_count 2
BUG: sleeping function called from invalid context at kernel/rwsem.c:21
in_atomic():1, irqs_disabled():1
INFO: lockdep is turned off.
irq event stamp: 136430
hardirqs last enabled at (136429): [<ffffffff8041d4c0>]
trace_hardirqs_on_thunk+0x35/0x3a
hardirqs last disabled at (136430): [<ffffffff8041de72>]
_spin_lock_irqsave+0x19/0x73
softirqs last enabled at (131948): [<ffffffff8023dcec>]
__do_softirq+0x9e/0xa7
softirqs last disabled at (131911): [<ffffffff8020d68c>]
call_softirq+0x1c/0x28
Pid: 3078, comm: zsh Tainted: G D 2.6.25 #12
Call Trace:
[<ffffffff80255f3d>] ? print_irqtrace_events+0x110/0x114
[<ffffffff8022f7fc>] __might_sleep+0xda/0xdc
[<ffffffff8041c7f6>] down_read+0x20/0x68
[<ffffffff802681eb>] acct_collect+0x42/0x1a7
[<ffffffff8023ba57>] do_exit+0x205/0x713
[<ffffffff803723e2>] ? do_unblank_screen+0x29/0x125
[<ffffffff8020d90d>] oops_begin+0x0/0x8f
[<ffffffff80223c64>] do_page_fault+0x69f/0x757
[<ffffffff8041e2ed>] error_exit+0x0/0xa9
[<ffffffff8024fb76>] ? up+0xf/0x39
[<ffffffff802b9ab6>] ? seq_printf+0x2e/0xa7
[<ffffffff8024fb76>] ? up+0xf/0x39
[<ffffffff8022dc31>] ? print_cfs_rq+0x130/0x465
[<ffffffff8024fb76>] ? up+0xf/0x39
[<ffffffff8041dfa5>] ? _spin_unlock_irqrestore+0x66/0x74
[<ffffffff8022df57>] ? print_cfs_rq+0x456/0x465
[<ffffffff8022e920>] ? sched_debug_show+0x9ba/0xd28
[<ffffffff8022f978>] ? cpu_clock+0xf0/0xff
[<ffffffff802745fe>] ? get_timestamp+0x9/0xf
[<ffffffff80274628>] ? touch_softlockup_watchdog+0x24/0x2d
[<ffffffff802319ec>] ? show_state_filter+0x8b/0xaa
[<ffffffff80375848>] ? sysrq_handle_showstate_blocked+0xe/0x10
[<ffffffff803757a3>] ? __handle_sysrq+0x9e/0x135
[<ffffffff802e2544>] ? write_sysrq_trigger+0x0/0x3a
[<ffffffff802e2574>] ? write_sysrq_trigger+0x30/0x3a
[<ffffffff802dc6b2>] ? proc_reg_write+0x8a/0xa7
[<ffffffff802a0118>] ? vfs_write+0xa7/0xe1
[<ffffffff802a020c>] ? sys_write+0x47/0x6d
[<ffffffff8020c3ab>] ? system_call_after_swapgs+0x7b/0x80
--
/--------------- - - - - - -
| Dan Noe
| http://isomerica.net/~dpn/
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