onenand_sim crashes

[Kyungmin Park]

Hi,

Thank you for point out.
There is a bug. It frees the static variable.

Please see the attached patch.

Thank you,
Kyungmin Park

> -----Original Message-----
> From: linux-mtd-bounces at lists.infradead.org [mailto:linux-mtd-bounces at lists.infradead.org] On
> Behalf Of Randy Dunlap
> Sent: Wednesday, October 17, 2007 2:15 PM
> To: lkml
> Cc: linux-mtd at lists.infradead.org; dwmw2 at infradead.org
> Subject: mtd: onenand_sim crashes
> 
> on x86_64, 2.6.23-git7, no MTD devices.
> Same config file as mtd crash a few minutes earlier.
> 
> loading onenand_sim a _second_ time crashes:
> 
> OneNAND Manufacturer: Samsung (0xec)
> OneNAND 16MB 1.8V 16-bit (0x04)
> OneNAND version = 0x001e
> Lock scheme is Continuous Lock
> Scanning device for bad blocks
> Creating 1 MTD partitions on "OneNAND simulator":
> 0x00000000-0x01000000 : "OneNAND simulator partition"
> mtd: Giving out device 0 to OneNAND simulator partition
> ------------[ cut here ]------------
> kernel BUG at mm/slab.c:2983!
> invalid opcode: 0000 [1] SMP
> CPU 0
> Modules linked in: hidp l2cap bluetooth snd_via82xx snd_ac97_codec ac97_bus snd_seq_dummy s
> nd_seq_oss snd_seq_midi_event snd_seq snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd_page_
> alloc snd_mpu401_uart parport snd_rawmidi snd_seq_device snd soundcore
> Pid: 3676, comm: bash Not tainted 2.6.23-git7 #11
> RIP: 0010:[<ffffffff8028a1af>]  [<ffffffff8028a1af>] cache_alloc_refill+0xcc/0x1b3
> RSP: 0018:ffff81002f199e18  EFLAGS: 00010046
> RAX: 0000000000000004 RBX: 0000000000000006 RCX: ffff8100010ff8a0
> RDX: ffff81003e7c0800 RSI: ffff8100010ff880 RDI: ffff81003d545680
> RBP: ffff81002f199e68 R08: ffff8100010ff880 R09: ffff810037ff4000
> R10: ffffffff8028a15c R11: 0000000000000202 R12: ffff81003d545680
> R13: ffff810037ff1a00 R14: ffff8100010ff880 R15: 000000000000000a
> FS:  00002b8d51d76f10(0000) GS:ffffffff806b4000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 00000000008e1f28 CR3: 0000000030508000 CR4: 00000000000006e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process bash (pid: 3676, threadinfo ffff81002f198000, task ffff81002fc5c040)
> Stack:  ffff81002fc5c040 000080d0806708d8 ffff81003e7c0800 ffff8100010ff8c0
>  0000000000000246 0000000000000246 00000000000080d0 ffff81003e7c0800
>  00000000ffffffff 0000000000000000 ffff81002f199e98 ffffffff8028a42b
> Call Trace:
>  [<ffffffff8028a42b>] kmem_cache_alloc+0x8c/0xd1
>  [<ffffffff80294579>] alloc_pipe_info+0x1b/0x48
>  [<ffffffff80294603>] create_write_pipe+0x5d/0x1b5
>  [<ffffffff80295115>] do_pipe+0x1a/0x105
>  [<ffffffff80211460>] sys_pipe+0x1c/0x4b
>  [<ffffffff8020be81>] tracesys+0x71/0xe1
>  [<ffffffff8020beec>] tracesys+0xdc/0xe1
> 
> 
> Code: 0f 0b eb fe 41 8b 5d 00 8b 55 d4 4c 89 e6 48 8b 7d c0 e8 1e
> RIP  [<ffffffff8028a1af>] cache_alloc_refill+0xcc/0x1b3
>  RSP <ffff81002f199e18>
> BUG: spinlock lockup on CPU#0, events/0/6, ffff8100010ff8c0
> 
> Call Trace:
>  [<ffffffff80328c19>] _raw_spin_lock+0xd1/0xf9
>  [<ffffffff8050bd0a>] _spin_lock_irq+0x47/0x54
>  [<ffffffff8028abc7>] drain_array+0x4e/0xc9
>  [<ffffffff8028b8ec>] cache_reap+0x0/0x20a
>  [<ffffffff8028b999>] cache_reap+0xad/0x20a
>  [<ffffffff8028b8ec>] cache_reap+0x0/0x20a
>  [<ffffffff80244def>] run_workqueue+0x97/0x16a
>  [<ffffffff8024589e>] worker_thread+0x0/0xea
>  [<ffffffff8024597d>] worker_thread+0xdf/0xea
>  [<ffffffff80248981>] autoremove_wake_function+0x0/0x38
>  [<ffffffff80248869>] kthread+0x49/0x78
>  [<ffffffff8020cb88>] child_rip+0xa/0x12
>  [<ffffffff802486e4>] kthreadd+0x120/0x145
>  [<ffffffff80248820>] kthread+0x0/0x78
>  [<ffffffff8020cb7e>] child_rip+0x0/0x12
> 
> ---
> ~Randy
> 
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