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SubjectRe: 2.6.17-rc5-mm1
On Tue, 30 May 2006, Arjan van de Ven wrote:

> On Tue, 2006-05-30 at 23:07 +0200, Laurent Riffard wrote:
>> Le 30.05.2006 11:29, Andrew Morton a écrit :
>>> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.17-rc5/2.6.17-rc5-mm1/
>>> ...
>>> Runtime locking validation.
>>
>> ============================
>> [ BUG: illegal lock usage! ]
>> ----------------------------
>> illegal {hardirq-on-W} -> {in-hardirq-W} usage.
>> events/0/4 [HC1[1]:SC0[0]:HE0:SE1] takes:
>> (&list->lock){+...}, at: [<c0247689>] skb_dequeue+0x12/0x43
>
> hmmm skb_dequeue is called in a hard irq...
>
>
>
>> {hardirq-on-W} state was registered at:
>> [<c012d2a1>] lockdep_acquire+0x56/0x6f
>> [<c029595b>] _spin_lock_bh+0x1c/0x29
>> [<c02922e0>] unix_stream_connect+0x2d8/0x3a7
>
> .. yet it was taken only with spin_lock_bh() in unix_stream_connect,
> leaving interrupts enabled (and thus not allowing use inside a hard irq)
>
>> [<c0243fb4>] sys_connect+0x54/0x71
>> [<c0244c5c>] sys_socketcall+0x6f/0x166
>> [<c0295afd>] sysenter_past_esp+0x56/0x8d
>> irq event stamp: 1886
>> hardirqs last enabled at (1885): [<c0295a2b>] _spin_unlock_irqrestore+0x35/0x3b
>> hardirqs last disabled at (1886): [<c01032fb>] common_interrupt+0x1b/0x2c
>> softirqs last enabled at (0): [<c0114af0>] copy_process+0x265/0x11dc
>> softirqs last disabled at (0): [<00000000>] init+0x3feffde0/0x1da
>>
>> other info that might help us debug this:
>> no locks held by events/0/4.
>>
>> stack backtrace:
>> [<c0103810>] show_trace_log_lvl+0x4b/0xf4
>> [<c0103e11>] show_trace+0xd/0x10
>> [<c0103e58>] dump_stack+0x19/0x1b
>> [<c012b8be>] print_usage_bug+0x1a4/0x1ae
>> [<c012c3c6>] mark_lock+0x8a/0x411
>> [<c012cc55>] __lockdep_acquire+0x302/0x8f8
>> [<c012d2a1>] lockdep_acquire+0x56/0x6f
>> [<c0295906>] _spin_lock_irqsave+0x20/0x2f
>> [<c0247689>] skb_dequeue+0x12/0x43
>> [<e0bdb7ac>] hpsb_bus_reset+0x55/0xa2 [ieee1394]
>
> yet hpsb_bus_reset() calls skb_dequeue (indirectly, via the inlined
> abort_requests() function) in a hard irq.
>

On x86_64, I'm seeing what may be flakiness related to skb_dequeue. I
haven't had a chance to look too closely, but the serial excerpt I have is
below. The real BUG of interest is near the end with

BUG: sleeping function called from invalid context at include/linux/rwsem.h:49

At the time of failure, a kernel compile was taking place. I've also seen
one ppc machine (not ppc64) lock up. There was no output to console so it
may or may not be related.

INIT: version 2.86 booting
Welcome to Fedora Core
Press 'I' to enter interactive startup.
Setting clock (localtime): Tue May 30 11:04:10 CDT 2006 [ OK ]
Starting udev: [ OK ]
Setting hostname bl6-13.ltc.austin.ibm.com: [ OK ]
Setting up Logical Volume Management: 2 logical volume(s) in volume group "VolGroup00" now active
[ OK ]
Checking filesystems
Checking all file systems.
[/sbin/fsck.ext3 (1) -- /] fsck.ext3 -a /dev/VolGroup00/LogVol00
/dev/VolGroup00/LogVol00: clean, 275453/7929856 files, 2546251/7929856 blocks
[/sbin/fsck.ext3 (1) -- /boot] fsck.ext3 -a /dev/sda1
/boot: clean, 62/512512 files, 43374/512064 blocks
[ OK ]
Remounting root filesystem in read-write mode: [ OK ]
Mounting local filesystems: [ OK ]
Enabling local filesystem quotas: [ OK ]
Enabling swap space: [ OK ]
INIT: Entering runlevel: 3
Entering non-interactive startup
Starting readahead_early: Starting background readahead: [ OK ]
[ OK ]
FATAL: Error inserting acpi_cpufreq (/lib/modules/2.6.17-rc5-mm1-autokern1/kernel/arch/x86_64/kernel/cpufreq/acpi-cpufreq.ko): No such device
Bringing up loopback interface: [ OK ]
Bringing up interface eth1: [ OK ]
Starting system logger: [ OK ]
Starting kernel logger: [ OK ]
Starting irqbalance: [ OK ]
Starting portmap: [ OK ]
Starting NFS statd: [ OK ]
Starting RPC idmapd: FATAL: Module sunrpc not found.
FATAL: Error running install command for sunrpc
Starting system message bus: [ OK ]
Starting Bluetooth services:[ OK ][ OK ]
Mounting other filesystems: [ OK ]
Starting hidd: [ OK ]
Starting automount: [ OK ]
Starting smartd: [ OK ]
Starting acpi daemon: [ OK ]
Starting hpiod: [ OK ]
Starting hpssd: [ OK ]
Starting cups: [ OK ]
Starting sshd: [ OK ]
Starting sendmail: [ OK ]
Starting sm-client: [ OK ]
Starting console mouse services: [ OK ]
Starting crond: [ OK ]
Starting xfs: [ OK ]
Starting anacron: [ OK ]
Starting atd: [ OK ]
Starting Avahi daemon: [ OK ]
Starting cups-config-daemon: [ OK ]
Starting HAL daemon: [ OK ]

Fedora Core release 5 (Bordeaux)
Kernel 2.6.17-rc5-mm1-autokern1 on an x86_64

bl6-13.ltc.austin.ibm.com login: -- 0:conmux-control -- time-stamp -- May/30/06 9:04:37 --
-- 0:conmux-control -- time-stamp -- May/30/06 9:08:26 --
NMI Watchdog detected LOCKUP on CPU 2
CPU 2
Modules linked in: ipv6 ppdev hidp rfcomm l2cap bluetooth video sony_acpi button battery asus_acpi ac lp parport_pc parport nvram
Pid: 25254, comm: cc1 Not tainted 2.6.17-rc5-mm1-autokern1 #1
RIP: 0010:[<ffffffff810814de>] [<ffffffff810814de>] cache_alloc_refill+0x16a/0x200
RSP: 0018:ffff81001d9edb88 EFLAGS: 00000097
RAX: 00000000ffffffff RBX: 000000000000000f RCX: ffff81001d9edcd4
RDX: ffff8100016df440 RSI: ffff81003c0cc000 RDI: ffff810037fd9400
RBP: ffff81003c0cc000 R08: ffff810037fda000 R09: ffff810037fd7000
R10: ffff81001d9ec000 R11: 0000000000000246 R12: ffff8100016df440
R13: ffff810037fda000 R14: 000000000000002c R15: ffff810037fd9400
FS: 00002b18bc9bcd30(0000) GS:ffff810037e09bc0(0063) knlGS:00000000f7f9e6b0
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f665c000 CR3: 000000001af2d000 CR4: 00000000000006e0
Process cc1 (pid: 25254, threadinfo ffff81001d9ec000, task ffff81003e048050)
Stack: 000000d000000246 0000000000000246 00000000000000d0 ffff810037fd9400
ffff810037fd9400 ffff81001d9edd68 0000000000000000 ffffffff81082a00
ffff81003b7b14c0 00000000000000d0
Call Trace:
[<ffffffff81082a00>] kmem_cache_alloc+0x7c/0x86
[<ffffffff8122e081>] __alloc_skb+0x30/0x11d
[<ffffffff8122c6e8>] sock_alloc_send_skb+0x6d/0x1ea
[<ffffffff8102c0d5>] __wake_up+0x36/0x4d
[<ffffffff8128949d>] unix_stream_sendmsg+0x14d/0x2ff
[<ffffffff81229fad>] do_sock_write+0xc7/0xd2
[<ffffffff8122a0fd>] sock_aio_write+0x4f/0x5e
[<ffffffff81086f28>] do_sync_write+0xc9/0x106
[<ffffffff812924f2>] do_page_fault+0x46f/0x7b0
[<ffffffff81046b6c>] autoremove_wake_function+0x0/0x2e
[<ffffffff810731f4>] do_mmap_pgoff+0x673/0x774
[<ffffffff8108704c>] vfs_write+0xe7/0x175
[<ffffffff8108718d>] sys_write+0x45/0x6e
[<ffffffff81022994>] cstar_do_call+0x1b/0x65


Code: 49 8b 04 24 48 89 68 08 48 89 45 00 4c 89 65 08 49 89 2c 24
console shuts up ...
NMI Watchdog detected LOCKUP on CPU 1
CPU 1
Modules linked in: ipv6 ppdev hidp rfcomm l2cap bluetooth video sony_acpi button battery asus_acpi ac lp parport_pc parport nvram
Pid: 15, comm: events/1 Not tainted 2.6.17-rc5-mm1-autokern1 #1
RIP: 0010:[<ffffffff81135167>] [<ffffffff81135167>] __delay+0xa/0x10
RSP: 0018:ffff810037f43d80 EFLAGS: 00000012
RAX: 0000000000000008 RBX: ffff8100016df480 RCX: 00000000a155bf6d
RDX: 0000000000000101 RSI: ffff8100016df440 RDI: 0000000000000001
RBP: 000000002e69b72b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffff8100016dfc40 R12: 0000000000000001
R13: 0000000000000000 R14: ffff8100016df440 R15: ffff810037fd9400
FS: 00002b99ea9c72d0(0000) GS:ffff81003efb98c0(0000) knlGS:00000000f7fdb6b0
CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 00000000009afb30 CR3: 000000003ebc6000 CR4: 00000000000006e0
Process events/1 (pid: 15, threadinfo ffff810037f42000, task ffff810037fef050)
Stack: ffffffff81140cfc 0000000000000000 ffff8100016df440 ffff810037fda400
ffffffff81081c7a ffff8100016df440 0000000000000000 ffff8100016df440
ffff81003ebd7880 ffff810037fd9400
Call Trace:
[<ffffffff81140cfc>] _raw_spin_lock+0x8b/0xf1
[<ffffffff81081c7a>] drain_array+0x51/0xd3
[<ffffffff810837af>] cache_reap+0x0/0x2ce
[<ffffffff8108389b>] cache_reap+0xec/0x2ce
[<ffffffff810837af>] cache_reap+0x0/0x2ce
[<ffffffff81043354>] run_workqueue+0xa1/0xeb
[<ffffffff8104339e>] worker_thread+0x0/0x137
[<ffffffff810434a3>] worker_thread+0x105/0x137
[<ffffffff8102c02e>] default_wake_function+0x0/0xe
[<ffffffff8102c02e>] default_wake_function+0x0/0xe
[<ffffffff81046652>] kthread+0x107/0x133
[<ffffffff8104339e>] worker_thread+0x0/0x137
[<ffffffff8100a146>] child_rip+0x8/0x12
[<ffffffff8104339e>] worker_thread+0x0/0x137
[<ffffffff8104654b>] kthread+0x0/0x133
[<ffffffff8100a13e>] child_rip+0x0/0x12


Code: 48 39 f8 72 f5 c3 65 8b 04 25 24 00 00 00 48 98 48 69 c0 c0
console shuts up ...
<1>Unable to handle kernel NULL pointer dereference at 0000000000000008 RIP:
[<ffffffff8122f9aa>] skb_dequeue+0x2c/0x50
PGD 330cf067 PUD 0
Oops: 0002 [1] SMP
last sysfs file: /block/sda/sda1/size
CPU 0
Modules linked in: ipv6 ppdev hidp rfcomm l2cap bluetooth video sony_acpi button battery asus_acpi ac lp parport_pc parport nvram
Pid: 1871, comm: sshd Not tainted 2.6.17-rc5-mm1-autokern1 #1
RIP: 0010:[<ffffffff8122f9aa>] [<ffffffff8122f9aa>] skb_dequeue+0x2c/0x50
RSP: 0018:ffff810032c81c28 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff810032a96510 RCX: 000000000000003f
RDX: 000000000000001f RSI: 0000000000000246 RDI: ffff810032a96528
RBP: ffff81003c0cc2c0 R08: 0000000100000000 R09: 0000000000000246
R10: 0000000000000246 R11: 000000000000001a R12: ffff810032a96528
R13: ffff810032c81da0 R14: ffff810032c81d68 R15: 0000000000000000
FS: 00002ac772097be0(0000) GS:ffffffff8146e000(0000) knlGS:00000000f7fad6b0
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000008 CR3: 000000003d28b000 CR4: 00000000000006e0
Process sshd (pid: 1871, threadinfo ffff810032c80000, task ffff810037f4c7d0)
Stack: ffff810032a96510 ffff81003c0cc2c0 ffff810032a96440 ffffffff812899a6
ffffffa100000001 0000001a00000001 0000000000000000 00000040000000d0
0000000000003fe6 ffff81003280c180
Call Trace:
[<ffffffff812899a6>] unix_stream_recvmsg+0x101/0x4bf
[<ffffffff8122c946>] release_sock+0x10/0xae
[<ffffffff81258520>] tcp_sendmsg+0x9b0/0xa82
[<ffffffff81229d87>] do_sock_read+0xc6/0xd1
[<ffffffff81229ed7>] sock_aio_read+0x4f/0x5e
[<ffffffff81086cb0>] do_sync_read+0xc9/0x106
[<ffffffff81046b6c>] autoremove_wake_function+0x0/0x2e
[<ffffffff812905e8>] _spin_unlock_irq+0x6/0xa
[<ffffffff8128e4e5>] thread_return+0x64/0xec
[<ffffffff81086dd1>] vfs_read+0xe4/0x172
[<ffffffff8108711f>] sys_read+0x45/0x6e
[<ffffffff810092be>] system_call+0x7e/0x83


Code: 48 89 58 08 48 c7 45 00 00 00 00 00 48 c7 45 08 00 00 00 00
RIP [<ffffffff8122f9aa>] skb_dequeue+0x2c/0x50 RSP <ffff810032c81c28>
CR2: 0000000000000008
<3>BUG: sleeping function called from invalid context at include/linux/rwsem.h:49
in_atomic():0, irqs_disabled():1

Call Trace:
[<ffffffff81029ba0>] __might_sleep+0xc0/0xc2
[<ffffffff810403ed>] blocking_notifier_call_chain+0x1f/0x4e
[<ffffffff81035a8a>] do_exit+0x22/0x8ce
[<ffffffff81184817>] do_unblank_screen+0x29/0x121
[<ffffffff812927c5>] do_page_fault+0x742/0x7b0
[<ffffffff81029f49>] activate_task+0x4b/0x99
[<ffffffff81098aad>] __pollwait+0x0/0xdd
[<ffffffff81009f8d>] error_exit+0x0/0x84
[<ffffffff8122f9aa>] skb_dequeue+0x2c/0x50
[<ffffffff8122f993>] skb_dequeue+0x15/0x50
[<ffffffff812899a6>] unix_stream_recvmsg+0x101/0x4bf
[<ffffffff8122c946>] release_sock+0x10/0xae
[<ffffffff81258520>] tcp_sendmsg+0x9b0/0xa82
[<ffffffff81229d87>] do_sock_read+0xc6/0xd1
[<ffffffff81229ed7>] sock_aio_read+0x4f/0x5e
[<ffffffff81086cb0>] do_sync_read+0xc9/0x106
[<ffffffff81046b6c>] autoremove_wake_function+0x0/0x2e
[<ffffffff812905e8>] _spin_unlock_irq+0x6/0xa
[<ffffffff8128e4e5>] thread_return+0x64/0xec
[<ffffffff81086dd1>] vfs_read+0xe4/0x172
[<ffffffff8108711f>] sys_read+0x45/0x6e
[<ffffffff810092be>] system_call+0x7e/0x83

NMI Watchdog detected LOCKUP on CPU 3
CPU 3
Modules linked in: ipv6 ppdev hidp rfcomm l2cap bluetooth video sony_acpi button battery asus_acpi ac lp parport_pc parport nvram
Pid: 1710, comm: sshd Not tainted 2.6.17-rc5-mm1-autokern1 #1
RIP: 0010:[<ffffffff81140cfc>] [<ffffffff81140cfc>] _raw_spin_lock+0x8b/0xf1
RSP: 0018:ffff81003319db68 EFLAGS: 00000002
RAX: 0000000000000008 RBX: ffff8100016df480 RCX: 00000000b3e3ec80
RDX: 0000000000000105 RSI: 00000000000000d0 RDI: 0000000000000001
RBP: 000000001713db5d R08: ffff81003c0d0440 R09: ffff81003d177340
R10: 00005555556bf377 R11: 0000000000000246 R12: 0000000000000001
R13: ffff810037fd8c00 R14: 000000000000003c R15: ffff810037fd9400
FS: 00002b2015099be0(0000) GS:ffff8100016dfec0(0000) knlGS:00000000f7fb26b0
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00005555556bf168 CR3: 00000000348c8000 CR4: 00000000000006e0
Process sshd (pid: 1710, threadinfo ffff81003319c000, task ffff810037f57810)
Stack: 0000000000000246 00000000000000d0 ffff8100016df440 ffffffff810813ef
000000d000000246 0000000000000246 00000000000000d0 ffff810037fd9400
ffff810037fd9400 ffff81003319dd68
Call Trace:
[<ffffffff810813ef>] cache_alloc_refill+0x7b/0x200
[<ffffffff81082a00>] kmem_cache_alloc+0x7c/0x86
[<ffffffff8122e081>] __alloc_skb+0x30/0x11d
[<ffffffff8122c6e8>] sock_alloc_send_skb+0x6d/0x1ea
[<ffffffff810381e0>] current_fs_time+0x4d/0x52
[<ffffffff8128949d>] unix_stream_sendmsg+0x14d/0x2ff
[<ffffffff81229fad>] do_sock_write+0xc7/0xd2
[<ffffffff8122a0fd>] sock_aio_write+0x4f/0x5e
[<ffffffff8106f6e8>] do_wp_page+0x38e/0x3c1
[<ffffffff81086f28>] do_sync_write+0xc9/0x106
[<ffffffff812924f2>] do_page_fault+0x46f/0x7b0
[<ffffffff81046b6c>] autoremove_wake_function+0x0/0x2e
[<ffffffff812905e8>] _spin_unlock_irq+0x6/0xa
[<ffffffff8128e4e5>] thread_return+0x64/0xec
[<ffffffff81032628>] do_fork+0x138/0x1b0
[<ffffffff8108704c>] vfs_write+0xe7/0x175
[<ffffffff8108718(bot:conmon-payload) disconnected
d>] sys_write+0x45/0x6e
[<ffffffff810092be>] system_call+0x7e/0x83


Code: eb d9 45 85 e4 74 d2 45 31 e4 65 48 8b 04 25 00 00 00 00 65
console shuts up ...

--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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