Is this only with yaffs as root or will stress also break non-root?
 

> -----Original Message-----
> From: yaffs-bounces@stoneboat.aleph1.co.uk 
> [mailto:yaffs-bounces@stoneboat.aleph1.co.uk] On Behalf Of 
> Andre Renaud
> Sent: Monday, 14 November 2005 2:05 p.m.
> To: yaffs@stoneboat.aleph1.co.uk
> Cc: manningc2@actrix.gen.nz
> Subject: Re: [Yaffs] Kernel panic in clear_inode when using 
> yaffs as rootfs
> 
> Andre Renaud wrote:
> > It is 100% reproducable, but not in a nice small test case. 
> I have a 
> > unit here that I can boot, and it will fail 100% of the time on 
> > startup in the same way.
> 
> I've found another way of reproducing the fault, that seems 
> reasonably regular (although not fool proof). Using "stress"
> http://weather.ou.edu/~apw/projects/stress/, with the 
> following options ./stress --hdd 10 --io 10 If I leave the 
> application running for a while (around 1 minute), then once 
> I Ctrl-C the application, the following fault is produced 
> (very similar to the previously reported one). The fault is 
> produced probably about 10 times in rapid succession. The 
> fault also doesn't happen instantly after the Ctrl-C, it 
> kicks in after about 5 seconds of idle time.
> 
> I'm not quite sure why this occurs only after I Ctrl-C the 
> application - I assume some kind of kernel level garbage 
> collection of file descriptors (this may explain the 5 
> seconds of idle time)?
> 
> kernel BUG at fs/inode.c:252!
> Unable to handle kernel NULL pointer dereference at virtual 
> address 00000000 pgd = c0004000 [00000000] *pgd=00000000 
> Internal error: Oops: 817 [#1] Modules linked in:
> CPU: 0
> PC is at __bug+0x40/0x54
> LR is at 0x1
> pc : [<c005a61c>]    lr : [<00000001>]    Not tainted
> sp : c5677d60  ip : 60000093  fp : c5677d70
> r10: 00000002  r9 : c5677fb0  r8 : c5530228
> r7 : c03f7780  r6 : c558a2b8  r5 : c5dcc174  r4 : 00000000
> r3 : 00000000  r2 : 00000000  r1 : 00001e13  r0 : 00000001
> Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  Segment user
> Control: 397F  Table: A5678000  DAC: 00000015 Process stress 
> (pid: 865, stack limit = 0xc5676194)
> Stack: (0xc5677d60 to 0xc5678000)
> 7d60: c558a2b8 c5677d84 c5677d74 c00c2ac4 c005a5e8 c5e6e000 c5677da0
> c5677d88
> 7d80: c010e114 c00c2a7c c558a2b8 c010e0a4 c558a2b8 c5677db8 c5677da4
> c00c3978
> 7da0: c010e0b0 c558a2b8 c558a2b8 c5677dc8 c5677dbc c00c3b5c 
> c00c38f0 c5677ddc
> 7dc0: c5677dcc c00c3bfc c00c3b4c c5530228 c5677df4 c5677de0 c00c0af8
> c00c3b74
> 7de0: c5c3d8c0 00000000 c5677e18 c5677df8 c00a8ac8 c00c0920 
> c5c3d8c0 00000000
> 7e00: c03eb900 c03eb908 00000001 c5677e28 c5677e1c c00a8980 c00a8990
> c5677e44
> 7e20: c5677e2c c00a70fc c00a894c 00000001 c03eb900 00000003 c5677e68
> c5677e48
> 7e40: c006c178 c00a709c 00000000 c565bd60 c5676000 c5676000 
> 00000001 c5677e90
> 7e60: c5677e6c c006ce28 c006c0f4 00000002 c5640114 c5676000 
> c5640104 c5677ee0
> 7e80: c565bf54 c5677ea4 c5677e94 c006d160 c006ccbc 00000009 c5677ed4
> c5677ea8
> 7ea0: c0076c94 c006d0d8 c5677f60 c5677fb0 c5676000 00000000 
> c5677f60 c5677ee0
> 7ec0: c565bf54 c0054e84 c5677f9c c5677ed8 c0058dc4 c00769ec c5677ed8
> c5677ed8
> 7ee0: 00000009 00000000 00000000 00000000 00000000 c558a358 c5c3d8c0
> c558a2b8
> 7f00: c5c3d8c0 00000000 c5677f48 c5677f18 c008ae1c 00000000 00000000
> 00000002
> 7f20: 00000002 c558a2b8 c5c3d8c0 000e000d c5676000 00000000 
> c5677f74 c5677f70
> 7f40: c5677f4c c00a7bfc c00d0758 c5c3d8e0 fffffff7 c5c3d8c0 c5677f74
> 00cffff3
> 7f60: 401ba4b8 c5677fa4 c5677f74 c00a7d08 c00a7ad8 00000000 
> befd4ca4 00008830
> 7f80: 00000004 c0054e84 c5676000 401ba4b8 c5677fac c5677fa0 
> c0058ef8 c0058d6c
> 7fa0: 00000000 c5677fb0 c0054d4c c0058edc 000e000d beed4c60 
> 000fffff 40000000
> 7fc0: 00000000 befd4ca4 00008830 4000b99c 00000007 00008b98 401ba4b8
> befd4cd4
> 7fe0: 00016488 beed4c58 0000c104 4015e7b4 20000010 00000003 
> 00000000 00000000
> Backtrace:
> 
> [<c005a5dc>] (__bug+0x0/0x54) from [<c00c2ac4>] 
> (clear_inode+0x54/0xc8)
>  r4 = C558A2B8
> [<c00c2a70>] (clear_inode+0x0/0xc8) from [<c010e114>]
> (yaffs_delete_inode+0x70/0x84)
>  r4 = C5E6E000
> 
> [<c010e0a4>] (yaffs_delete_inode+0x0/0x84) from [<c00c3978>]
> (generic_delete_inode+0x94/0x108)
>  r6 = C558A2B8  r5 = C010E0A4  r4 = C558A2B8
> 
> [<c00c38e4>] (generic_delete_inode+0x0/0x108) from [<c00c3b5c>]
> (generic_drop_inode+0x1c/0x28)
>  r5 = C558A2B8  r4 = C558A2B8
> 
> [<c00c3b40>] (generic_drop_inode+0x0/0x28) from [<c00c3bfc>]
> (iput+0x94/0xa8)
> [<c00c3b68>] (iput+0x0/0xa8) from [<c00c0af8>] (dput+0x1e4/0x214)
> 
>  r4 = C5530228
> [<c00c0914>] (dput+0x0/0x214) from [<c00a8ac8>] (__fput+0x144/0x180)
>  r5 = 00000000  r4 = C5C3D8C0
> [<c00a8984>] (__fput+0x0/0x180) from [<c00a8980>] (fput+0x40/0x44)
>  r8 = 00000001  r7 = C03EB908  r6 = C03EB900  r5 = 00000000
>  r4 = C5C3D8C0
> [<c00a8940>] (fput+0x0/0x44) from [<c00a70fc>] 
> (filp_close+0x6c/0x78) [<c00a7090>] (filp_close+0x0/0x78) 
> from [<c006c178>]
> (put_files_struct+0x90/0xd0)
>  r6 = 00000003  r5 = C03EB900  r4 = 00000001
> 
> [<c006c0e8>] (put_files_struct+0x0/0xd0) from [<c006ce28>]
> (do_exit+0x178/0x3cc)
>  r8 = 00000001  r7 = C5676000  r6 = C5676000  r5 = C565BD60
> 
>  r4 = 00000000
> [<c006ccb0>] (do_exit+0x0/0x3cc) from [<c006d160>] 
> (do_group_exit+0x94/0x9c) [<c006d0cc>] 
> (do_group_exit+0x0/0x9c) from [<c0076c94>]
> (get_signal_to_deliver+0x2b4/0x2d4)
>  r4 = 00000009
> 
> [<c00769e0>] (get_signal_to_deliver+0x0/0x2d4) from [<c0058dc4>]
> (do_signal+0x64/0x170)
> [<c0058d60>] (do_signal+0x0/0x170) from [<c0058ef8>]
> (do_notify_resume+0x28/0x2c)
> [<c0058ed0>] (do_notify_resume+0x0/0x2c) from [<c0054d4c>]
> (work_pending+0x1c/0x24)
> Code: 1b00412c e59f0014 eb00412a e3a03000 (e5833000)
> 
>  <1>Fixing recursive fault but reboot is needed!
> 
> 
> 
> 
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