> - on a 2.6.20 system, try "dd if=/dev/sdb of=/dev/null bs=4k count=1" or
> something like this (with NFS root) - does this crash, too?
no it does not crash it is also no problem to set the count= to 10000 or
so or change the bs to 16k ...
> - do you have ACLs on files in /dev?
no
> - enable the sysrq key, make sure kernel messages go to the console
> by using "dmesg -n7", and when the kernel hangs, try sysrq-p, and
> sysrq-t
> (sysrq is documented in Documation/sysrq.txt in the kernel source)
> - try to capture the oops message - there must be one.
OK i've done the following:
1.) I've set up netconsole
2.) dmesg -n7
3.) fdisk /dev/sda
4.) sysrq-t / sysrq-p
So here is the output of -p and -t it hangs at nfs_sync_mapping_wait:
SysRq : Show Regs
Pid: 1598, comm: fdisk
EIP: 0060:[<c03bf506>] CPU: 0
EIP is at _spin_lock+0x7/0xf
EFLAGS: 00000286 Not tainted (2.6.20.3 #6)
EAX: c3117afc EBX: c3117a2c ECX: 00000020 EDX: 00000000
ESI: f7b63ed4 EDI: f7b63f04 EBP: f7b63edc DS: 007b ES: 007b GS: 00d8
CR0: 8005003b CR2: b7f00f90 CR3: 033ea000 CR4: 000006d0
[<c01b5c92>] nfs_sync_mapping_wait+0x83/0x1aa
[<c01516c5>] cache_alloc_refill+0xc8/0x196
[<c01b5eca>] nfs_sync_mapping_range+0x97/0xb6
[<c01ae5cf>] nfs_getattr+0x3a/0x96
[<c01ae595>] nfs_getattr+0x0/0x96
[<c01565d9>] vfs_getattr+0x21/0x30
[<c01566a3>] vfs_fstat+0x22/0x31
[<c0156c51>] sys_fstat64+0xf/0x23
[<c015da9c>] sys_ioctl+0x33/0x4b
[<c0114358>] do_page_fault+0x0/0x549
[<c010291c>] syscall_call+0x7/0xb
[<c03b0033>] call_verify+0x182/0x36f
=======================
SysRq : Show State
free sibling
task PC stack pid father child younger older
init S C0117721 0 1 0 2 (NOTLB)
c313fc48 00000082 c312fa90 c0117721 00100100 00200200 f7da9600
f7941e40
00000010 c313fc04 00000008 00000002 c3022700 c312fa90 c312fb9c
000008dd
64bf803e 00000029 c312f030 c313fc90 00000000 c30013c0 c03b3515
c03b352f
Call Trace:
[<c0117721>] default_wake_function+0x0/0xc
[<c03b3515>] rpc_wait_bit_interruptible+0x0/0x1f
[<c03b352f>] rpc_wait_bit_interruptible+0x1a/0x1f
[<c03beb38>] __wait_on_bit+0x2c/0x51
[<c03b3515>] rpc_wait_bit_interruptible+0x0/0x1f
[<c03bebd0>] out_of_line_wait_on_bit+0x73/0x7b
[<c012c950>] wake_bit_function+0x0/0x3c
[<c012c950>] wake_bit_function+0x0/0x3c
[<c03b3c6a>] __rpc_execute+0xdb/0x18b
[<c03b354d>] rpc_set_active+0x19/0x57
[<c03af1ef>] rpc_call_sync+0x71/0x98
[<c01b1824>] nfs_proc_getattr+0x5b/0x7f
[<c01ae981>] __nfs_revalidate_inode+0xe7/0x21a
[<c01ad415>] nfs_permission+0x0/0x133
[<c01ad415>] nfs_permission+0x0/0x133
[<c01ad527>] nfs_permission+0x112/0x133
[<c01ad415>] nfs_permission+0x0/0x133
[<c0159928>] permission+0x94/0xa2
[<c0159e57>] __link_path_walk+0x6c/0xa59
[<c013e20c>] __alloc_pages+0x4a/0x2a3
[<c015a883>] link_path_walk+0x3f/0xa4
[<c015abc5>] do_path_lookup+0x170/0x18b
[<c015ae0c>] __user_walk_fd+0x2d/0x43
[<c0156601>] vfs_stat_fd+0x19/0x40
[<c0156c0b>] sys_stat64+0xf/0x23
[<c02456d4>] copy_to_user+0x2f/0x37
[<c01234f6>] do_gettimeofday+0x35/0x119
[<c011f93e>] sys_time+0x1e/0x2e
[<c010291c>] syscall_call+0x7/0xb
=======================
ksoftirqd/0 S C33442C0 0 3 1 4 2 (L-TLB)
c3149fb8 00000046 c013cd73 c33442c0 00000000 c30131e0 00000003
f7931900
c301321c 00000000 c33f5030 00000000 c3012700 c3136030 c313613c
000001d9
a733fbbd 00000004 c04a8cc0 c0539380 c0539380 c0120494 fffffffc
c01204d6
Call Trace:
[<c013cd73>] mempool_free+0x65/0x6a
[<c0120494>] ksoftirqd+0x0/0xa7
[<c01204d6>] ksoftirqd+0x42/0xa7
[<c012c5e6>] kthread+0x72/0x96
[<c012c574>] kthread+0x0/0x96
[<c01034f7>] kernel_thread_helper+0x7/0x10
=======================
migration/1 S F745BF24 0 4 1 5 3 (L-TLB)
c314bfb0 00000046 00000092 f745bf24 00000001 f745bf70 c314bf94
f7ab03c0
00000000 00000001 f745bf74 00000001 c301a700 c3139a90 c3139b9c
000023c5
b7d09ccb 00000004 c312f560 c301b054 c301a700 00000001 c314bfc4
c0118643
Call Trace:
[<c0118643>] migration_thread+0x7a/0xd2
[<c01185c9>] migration_thread+0x0/0xd2
[<c012c5e6>] kthread+0x72/0x96
[<c012c574>] kthread+0x0/0x96
[<c01034f7>] kernel_thread_helper+0x7/0x10
=======================
ksoftirqd/1 S C301B1A0 0 5 1 6 4 (L-TLB)
c316ffb8 00000046 00000000 c301b1a0 00000008 c012a884 c301b1e0
f7f39040
c012aa25 c301b21c 00000000 00000001 c301a700 c3139560 c313966c
00000c4f
48c808e9 00000004 c312f560 c0539380 c0539380 c0120494 fffffffc
c01204d6
Call Trace:
[<c012a884>] rcu_do_batch+0x1a/0x7f
[<c012aa25>] __rcu_process_callbacks+0x8f/0xa1
[<c0120494>] ksoftirqd+0x0/0xa7
[<c01204d6>] ksoftirqd+0x42/0xa7
[<c012c5e6>] kthread+0x72/0x96
[<c012c574>] kthread+0x0/0x96
[<c01034f7>] kernel_thread_helper+0x7/0x10
=======================
migration/2 S F7B63F24 0 6 1 7 5 (L-TLB)
c3171fb0 00000046 00000092 f7b63f24 00000001 f7b63f70 c3171f94
f79703c0
00000000 00000001 f7b63f74 00000002 c3022700 c3139030 c313913c
000011f0
482d3411 00000022 c312f030 c3023054 c3022700 00000002 c3171fc4
c0118643
Call Trace:
[<c0118643>] migration_thread+0x7a/0xd2
[<c01185c9>] migration_thread+0x0/0xd2
[<c012c5e6>] kthread+0x72/0x96
[<c012c574>] kthread+0x0/0x96
[<c01034f7>] kernel_thread_helper+0x7/0x10
=======================
ksoftirqd/2 S C324D780 0 7 1 8 6 (L-TLB)
c3175fb8 00000046 c013cd73 c324d780 00000000 c30231e0 00000003
f7ba2740
c302321c 00000000 c053ab90 00000002 c3022700 c3155a90 c3155b9c
00000564
610707d5 00000004 c312f030 c0539380 c0539380 c0120494 fffffffc
c01204d6
Call Trace:
[<c013cd73>] mempool_free+0x65/0x6a
[<c0120494>] ksoftirqd+0x0/0xa7
[<c01204d6>] ksoftirqd+0x42/0xa7
[<c012c5e6>] kthread+0x72/0x96
[<c012c574>] kthread+0x0/0x96
[<c01034f7>] kernel_thread_helper+0x7/0x10
=======================
migration/3 S F74F1F24 0 8 1 9 7 (L-TLB)
c3177fb0 00000046 00000092 f74f1f24 00000001 f74f1f70 c3177f94
f7ab03c0
00000000 00000001 f74f1f74 00000003 c302a700 c3155560 c315566c
00000ea1
b2116928 00000004 c3136a90 c302b054 c302a700 00000003 c3177fc4
c0118643
Call Trace:
[<c0118643>] migration_thread+0x7a/0xd2
[<c01185c9>] migration_thread+0x0/0xd2
[<c012c5e6>] kthread+0x72/0x96
[<c012c574>] kthread+0x0/0x96
[<c01034f7>] kernel_thread_helper+0x7/0x10
=======================
ksoftirqd/3 S C317BFC4 0 9 1 10 8 (L-TLB)
c317bfb8 00000046 c03be392 c317bfc4 00000046 00000086 c313fee8
00000002 c312f560 kthread+0x72/0x96
0000002e schedule_timeout+0x70/0x8d
00000082 prep_new_page+0xb2/0xea
[<c02456d4>] inet_csk_accept+0x51/0x125
Stefan
Olaf Kirch schrieb:
> On Tuesday 20 March 2007 11:59, Stefan Priebe wrote:
>> Kernel command line: nfs root=/dev/nfs nfsroot=192.168.0.100:/PXE/debian
>> ip=dhcp
>
> Some things that may be worth trying:
>
> - on a 2.6.20 system, try "dd if=/dev/sdb of=/dev/null bs=4k count=1" or
> something like this (with NFS root) - does this crash, too?
>
> - do you have ACLs on files in /dev?
>
> - enable the sysrq key, make sure kernel messages go to the console
> by using "dmesg -n7", and when the kernel hangs, try sysrq-p, and
sysrq-t
> (sysrq is documented in Documation/sysrq.txt in the kernel source)
>
> - try to capture the oops message - there must be one.
>
> Olaf
-
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