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SubjectRe: panic with strcmp

(Vegard Cc:-ed. Incidentally he found a use-after-free bug via
kmemcheck in the sysfs code. Could it be related?)

* Yinghai Lu <yinghai@kernel.org> wrote:

> happen on kexec loop test, it seems it only do kexec three
> time continuous. only on one two sockets with quad core
> opteron + 16 sas disks.
>
> YH
>
> [ 11.139038] calling pty_init+0x0/0x606 @ 1
> [ 11.163070] general protection fault: 0000 [#1] SMP
> [ 11.167058] last sysfs file:
> [ 11.167058] CPU 5
> [ 11.167058] Modules linked in:
> [ 11.167058] Pid: 1, comm: swapper Not tainted
> 2.6.29-rc7-tip-02233-ga94bfce-dirty #736 SMP Mon Mar 9 11:24:51 PDT
> 2009 Sun Fire X4240
> [ 11.167058] RIP: 0010:[<ffffffff8053244d>] [<ffffffff8053244d>]
> strcmp+0x19/0x45
> [ 11.167058] RSP: 0018:ffff8804270499f0 EFLAGS: 00010246
> [ 11.167058] RAX: 0000000000000000 RBX: ffff88042403e050 RCX: ffff880424776270
> [ 11.167058] RDX: 0000000000000000 RSI: ffff880224676080 RDI: 0010c2c018100dbf
> [ 11.167058] RBP: ffff880427049a00 R08: 0000000000000001 R09: ffff880427049978
> [ 11.167058] R10: 000000003ce73f1d R11: 000000003ce73f20 R12: ffff880224676080
> [ 11.167058] R13: ffff880427049ab0 R14: ffff880424776280 R15: ffff880427049b28
> [ 11.167058] FS: 0000000000000000(0000) GS:ffffc20000069000(0000)
> knlGS:0000000000000000
> [ 11.167058] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
> [ 11.167058] CR2: 0000000000000000 CR3: 0000000000201000 CR4: 00000000000006e0
> [ 11.167058] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 11.167058] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [ 11.167058] Process swapper (pid: 1, threadinfo ffff880427048000,
> task ffff880227060000)
> [ 11.167058] Stack:
> [ 11.167058] 0000000000000006 000000003ce73f1d ffff880427049a30
> ffffffff8034562e
> [ 11.167058] ffff880227c0b800 000000003ce73f1d ffff880224675f50
> ffff880224675f50
> [ 11.167058] ffff880427049a70 ffffffff803457ed 0000000000000001
> ffff880427049a6c
> [ 11.167058] Call Trace:
> [ 11.167058] [<ffffffff8034562e>] sysfs_find_dirent+0x2f/0x5a
> [ 11.167058] [<ffffffff803457ed>] __sysfs_add_one+0x2e/0xd8
> [ 11.167058] [<ffffffff803458b9>] sysfs_add_one+0x22/0x68
> [ 11.167058] [<ffffffff80345fd9>] create_dir+0x67/0xb6
> [ 11.167058] [<ffffffff8034606f>] sysfs_create_dir+0x47/0x72
> [ 11.167058] [<ffffffff8052e05e>] kobject_add_internal+0xe4/0x1ba
> [ 11.167058] [<ffffffff8052e264>] kobject_add_varg+0x50/0x73
> [ 11.167058] [<ffffffff8052e374>] kobject_add+0x73/0x89
> [ 11.167058] [<ffffffff805dcbd6>] device_add+0xcf/0x56f
> [ 11.167058] [<ffffffff8052dbe4>] ? kobject_init+0x56/0xac
> [ 11.167058] [<ffffffff805dd09e>] device_register+0x28/0x43
> [ 11.167058] [<ffffffff805dd167>] device_create_vargs+0xae/0xf0
> [ 11.167058] [<ffffffff805dd1e4>] device_create+0x3b/0x51
> [ 11.167058] [<ffffffff805e1f1a>] ? kobj_map+0x12f/0x154
> [ 11.167058] [<ffffffff8059f792>] tty_register_device+0xe9/0x10a
> [ 11.167058] [<ffffffff8059f996>] tty_register_driver+0x1e3/0x221
> [ 11.167058] [<ffffffff8112938d>] ? pty_init+0x0/0x606
> [ 11.167058] [<ffffffff8112963b>] pty_init+0x2ae/0x606
> [ 11.167058] [<ffffffff80209092>] do_one_initcall+0x65/0x14e
> [ 11.167058] [<ffffffff810fa80e>] kernel_init+0x14a/0x1b6
> [ 11.167058] [<ffffffff80230d5a>] child_rip+0xa/0x20
> [ 11.167058] [<ffffffff810fa6c4>] ? kernel_init+0x0/0x1b6
> [ 11.167058] [<ffffffff80230d50>] ? child_rip+0x0/0x20
> [ 11.167058] Code: 14 25 28 00 00 00 48 89 f8 74 05 e8 57 98 d3 ff
> c9 c3 55 31 d2 48 89 e5 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89
> 45 f8 31 c0 <8a> 0c 17 88 c8 2a 04 16 84 c0 75 07 48 ff c2 84 c9 75 ed
> 48 8b
> [ 11.167058] RIP [<ffffffff8053244d>] strcmp+0x19/0x45
> [ 11.167058] RSP <ffff8804270499f0>
> [ 11.461778] ---[ end trace 800948b0be98e94c ]---


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