[Bugme-new] [Bug 10736] New: ip2main has issues

bugme-daemon at bugzilla.kernel.org bugme-daemon at bugzilla.kernel.org
Sat May 17 13:24:46 PDT 2008


http://bugzilla.kernel.org/show_bug.cgi?id=10736

           Summary: ip2main has issues
           Product: Drivers
           Version: 2.5
     KernelVersion: 2.6.26-rc2
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Serial
        AssignedTo: rmk at arm.linux.org.uk
        ReportedBy: devzero at web.de


Latest working kernel version: n/a
Earliest failing kernel version: 2.6.25

Distribution: suse 10.1
Hardware Environment: vmware & system with p4 and gigabyte i915 based mainboard
Software Environment: 
Problem Description:
i get system crashes when loading/unloading ip2main module

Steps to reproduce:
build a mostly allmodconfig kernel
load modules like this:
while true;do cat modulelist |while read a;do echo $a;modprobe $a;modprobe -r
$a;done;done

exclude ip2main and other unstable modules from this list ;)

let this run for a while.
no crashes? good!

now do modprobe ip2main, modprobe -r ip2main and you may get:

[ 3184.393663] BUG: unable to handle kernel NULL pointer dereference at
00000094
[ 3184.393663] IP: [<c025641e>] tty_unregister_driver+0x7/0xf8
[ 3184.393663] *pde = 00000000
[ 3184.393663] Oops: 0000 [#1] SMP
[ 3184.393663] Modules linked in: ip2main(-) ar7part mtd eql sha1_generic arc4
ecb ide_generic siimage aec62xx trm290 alim15x3 hpt34x hpt366 cmd64x cmd640
piix rz1000 slc90e66 jmicron cs5535 cs5530 cs5520 sc1200 triflex
ide_pci_generic atiixp pdc202xx_old pdc202xx_new tc86c001 opti621 ns87415
cy82c693 amd74xx sis5513 via82cxxx serverworks it821x it8213 ide_core eni suni
zatm uPD98402 atm non_fatal p4_clockmod speedstep_lib freq_table decnet fcrypt
pcbc crypto_blkcipher cryptomgr sctp libcrc32c ts_kmp ip_gre dccp_ipv6
dccp_ipv4 dccp sunrpc psmouse vboxdrv ipv6 loop mousedev evdev e100 mii
8250_pnp iTCO_wdt iTCO_vendor_support usbcore intel_agp agpgart parport_pc lp
parport 8250 serial_core edd sg megaraid_mbox megaraid_mm sr_mod cdrom sd_mod
scsi_mod [last unloaded: drm]
[ 3184.393772]
[ 3184.393772] Pid: 28941, comm: modprobe Not tainted (2.6.26-rc2-git5 #4)
[ 3184.393772] EIP: 0060:[<c025641e>] EFLAGS: 00010246 CPU: 1
[ 3184.393772] EIP is at tty_unregister_driver+0x7/0xf8
[ 3184.393772] EAX: 00000000 EBX: 00000000 ECX: 000002e5 EDX: 00000000
[ 3184.393772] ESI: 00000000 EDI: 00000010 EBP: f68ebf3c ESP: f68ebf34
[ 3184.393772]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[ 3184.393772] Process modprobe (pid: 28941, ti=f68eb000 task=f553f080
task.ti=f68eb000)
[ 3184.393772] Stack: 00000004 00000010 f68ebf50 f886afc6 f886d780 00000000
00000080 f68ebfb0
[ 3184.393772]        c0140899 6d327069 006e6961 f660b528 f68ebf74 c016813d
f7b7cc00 f660b528
[ 3184.393772]        f68ebfa0 c0168aa7 ffffffff b7fe2000 f660b160 b7fe3000
f660b16c 0060b160
[ 3184.393772] Call Trace:
[ 3184.393772]  [<f886afc6>] ? ip2_cleanup_module+0xf2/0x1a0 [ip2main]
[ 3184.393772]  [<c0140899>] ? sys_delete_module+0x18e/0x1d9
[ 3184.393772]  [<c016813d>] ? remove_vma+0x41/0x47
[ 3184.393772]  [<c0168aa7>] ? do_munmap+0x17d/0x197
[ 3184.393772]  [<c0103811>] ? sysenter_past_esp+0x6a/0x91
[ 3184.393772]  [<c02f0000>] ? pcibios_setup+0xa8/0x2a0
[ 3184.393772]  =======================
[ 3184.393772] Code: 8d 65 f4 5b 5e 5f 5d c3 55 89 d1 8b 50 50 89 e5 c1 e2 14
0b 50 54 a1 9c 65 4b c0 01 ca e8 4d 11 01 00 5d c3 55 89 e5 57 56 89 c6 <83> be
94 00 00 00 00 b8 f0 ff ff ff 53 0f 85 d9 00 00 00 8b 46
[ 3184.393772] EIP: [<c025641e>] tty_unregister_driver+0x7/0xf8 SS:ESP
0068:f68ebf34
[ 3184.393772] ---[ end trace aa241cd23893ce1c ]---


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