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Subjectraidsetfaulty (on raid5) gives kernel oops

tried to fail a disk on my raid5 array
so i did : 'raidsetfaulty /dev/md0 /dev/sdf1'

and then i have this in my kernel log :

raid5: Disk failure on sdf1, disabling device. Operation continuing on 4
md: updating md0 RAID superblock on device
md: sdf1 [events: 00000002]<6>(write) sdf1's sb offset: 117218176
md: recovery thread got woken up ...
md0: no spare disk to reconstruct array! -- continuing in degraded mode
Unable to handle kernel NULL pointer dereference at virtual address
printing eip:
*pde = 00000000
md: recovery thread finished ...
Oops: 0000
CPU: 3
EIP: 0010:[<c025a526>] Not tainted
EFLAGS: 00010206
eax: 00000000 ebx: 00000000 ecx: 00000400 edx: de718000
esi: 00000000 edi: de718000 ebp: 00001000 esp: de6e1f34
ds: 0018 es: 0018 ss: 0018
Process raid5d (pid: 575, stackpage=de6e1000)
Stack: dfb05780 dfb05780 de719000 c02557e2 de718000 00000000 00001000
00000851 ce919200 dfb05780 df748500 dea14c94 dea14c80 c0255b57
00000002 c166b72c 00000064 00000000 de6e0000 c166b400 dfb05700
Call Trace: [<c02557e2>] [<c0255b57>] [<c0250816>] [<c0258e3f>]

Code: f3 a5 e9 53 ff ff ff 8d 76 00 c1 e9 02 89 d7 f3 a5 a4 e9 43

i can still access my raid5 device (so i don't know if this is just
something i can ignore ?)

/proc/mdstat gives me :

Personalities : [raid0] [raid5]
read_ahead 1024 sectors
md0 : active raid5 sdf1[4](F) sde1[3] sdd1[2] sdc1[1] sdb1[0]
468872704 blocks level 5, 64k chunk, algorithm 0 [5/4] [UUUU_]

unused devices: <none>

System is an Intel Dual Xeon 2 Ghz (with htt enabled)
512mb memory
3ware 7850 with 6*120gb 7200 2mb wdc ide

kernel 2.4.20-pre10

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