ARECA: oops when removing arcmsr module

Dear Support,

The following bug is reported on a 2.6.17.6 (kernel.org) kernel, SMP
system with 4 (dual core) AMD 64 Opteron CPUs.
When I remove the arcmsr module, the following kernel oops comes up:

-------------

Unable to handle kernel paging request at ffffffff88064608 RIP:
<ffffffff80249e54>{do_ioctl+36}
PGD 203027 PUD 205027 PMD 2fbd7f067 PTE 0
Oops: 0000 [1] SMP
CPU 7
Modules linked in: autofs4 sunrpc ip_conntrack_netbios_ns ipt_REJECT xt_state ip_conntrack nfnetlink xt_tcpudp iptable_filter ip_tables x_tables dm_mirror dm_mod sg floppy tg3 i2c_nforce2 i2c_core sata_nv libata sd_mod scsi_mod
Pid: 2806, comm: areca_archttp64 Not tainted 2.6.17.6-GB4 #2
RIP: 0010:[<ffffffff80249e54>] <ffffffff80249e54>{do_ioctl+36}
RSP: 0018:ffff8102f6475ee8  EFLAGS: 00010286
RAX: ffffffff880645c0 RBX: ffff8102fbb2b840 RCX: 00002ba15df7cb40
RDX: 00002ba15df7cb40 RSI: 0000000090000804 RDI: ffff8102fbb2b840
RBP: 00002ba15df7cb40 R08: ffff8102f6475dc8 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000090000804
R13: 0000000000000006 R14: 0000000090000804 R15: 00002ba15ce01fc0
FS:  00002ba15ce01fc0(0000) GS:ffff810300227640(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffffffff88064608 CR3: 00000001f9bf4000 CR4: 00000000000006e0
Process areca_archttp64 (pid: 2806, threadinfo ffff8102f6474000, task ffff810200358780)
Stack: ffff8102fbb2b840 00002ba15df7cb40 0000000000000006 ffffffff8023501b
       0000000090000804 0000000000000000 0000000000000000 ffff8102fbb2b840
       00002ba15df7cb40 0000000000000006
Call Trace: <ffffffff8023501b>{vfs_ioctl+683} <ffffffff8025683c>{sys_ioctl+108}
       <ffffffff8026bc01>{tracesys+209}

Code: 48 8b 48 48 48 85 c9 74 17 ff d1 48 c7 c1 ea ff ff ff 48 63
RIP <ffffffff80249e54>{do_ioctl+36} RSP <ffff8102f6475ee8>
CR2: ffffffff88064608
 <3>BUG: sleeping function called from invalid context at /usr/local/myper/usr/src/linux-2.6.17.6/include/linux/rwsem.h:43
in_atomic():0, irqs_disabled():1

Call Trace: <ffffffff802a164c>{blocking_notifier_call_chain+44}
       <ffffffff80216a52>{do_exit+34} <ffffffff80428eb5>{do_unblank_screen+133}
       <ffffffff80273f75>{do_page_fault+2037} <ffffffff803ae2ca>{avc_has_perm+90}
       <ffffffff803ae2ca>{avc_has_perm+90} <ffffffff8026c965>{error_exit+0}
       <ffffffff80249e54>{do_ioctl+36} <ffffffff8023501b>{vfs_ioctl+683}
       <ffffffff8025683c>{sys_ioctl+108} <ffffffff8026bc01>{tracesys+209}
Unable to handle kernel paging request at ffffffff88064628 RIP:
<ffffffff80226d09>{filp_close+57}
PGD 203027 PUD 205027 PMD 2fbd7f067 PTE 0
Oops: 0000 [2] SMP
CPU 7
Modules linked in: autofs4 sunrpc ip_conntrack_netbios_ns ipt_REJECT xt_state ip_conntrack nfnetlink xt_tcpudp iptable_filter ip_tables x_tables dm_mirror dm_mod sg floppy tg3 i2c_nforce2 i2c_core sata_nv libata sd_mod scsi_mod
Pid: 2804, comm: areca_archttp64 Not tainted 2.6.17.6-GB4 #2
RIP: 0010:[<ffffffff80226d09>] <ffffffff80226d09>{filp_close+57}
RSP: 0018:ffff8102f6471cd8  EFLAGS: 00010286
RAX: ffffffff880645c0 RBX: ffff8102fbb2b840 RCX: 0000000000000020
RDX: 0000000000000000 RSI: ffff8103fbd64700 RDI: ffff8102fbb2b840
RBP: ffff8103fbcd4f40 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: ffffffff802400c0 R12: ffff8103fbd64700
R13: ffff8103fbd64700 R14: 0000000000000000 R15: 0000000000000000
FS:  00000000006e6c00(0000) GS:ffff810300227640(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffffffff88064628 CR3: 0000000000201000 CR4: 00000000000006e0
Process areca_archttp64 (pid: 2804, threadinfo ffff8102f6470000, task ffff810200398140)
Stack: 00000000000007bf ffff8103fbcd4f40 0000000000000000 ffffffff8023f32e
       0000000000000030 ffff8103fbd64700 ffff810200398140 ffff810200398778
       0000000000000001 0000000000000009
Call Trace: <ffffffff8023f32e>{put_files_struct+110}
       <ffffffff80216ca9>{do_exit+633} <ffffffff8029f07e>{__dequeue_signal+478}
       <ffffffff80252cb8>{do_group_exit+200} <ffffffff8022f6ad>{get_signal_to_deliver+1197}
       <ffffffff8022deb1>{do_signal+129} <ffffffff8029f29e>{signal_wake_up+30}
       <ffffffff8023003c>{sys_recvfrom+332} <ffffffff8029fdd6>{kill_proc_info+86}
       <ffffffff802b877d>{audit_syscall_exit+109} <ffffffff8026bca2>{int_signal+18}

Code: 48 8b 40 68 48 85 c0 74 06 ff d0 89 c5 eb 02 31 ed 48 89 df
RIP <ffffffff80226d09>{filp_close+57} RSP <ffff8102f6471cd8>
CR2: ffffffff88064628
 <1>Fixing recursive fault but reboot is needed!

-------------

I note that the poor user-space areca_archttp64 daemon was indeed
running when the module was removed from below, but the kernel oops
still should not happen.

The kernel config is at :

http://www.cfa.harvard.edu/~gbakos/cf7/config

Best Regards,
Gaspar
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