Most recent kernel where this bug did not occur: I have the most recent stable kernel Distribution: Gentoo Hardware Environment: Laptop with P4 "prescott" 3200MHz, 1024MB of RAM, matherboard Sis 648FX, Ati mobility radeon 9700 with 128MB Software Environment: Kernel 2.6.17.11 #1 SMP PREEMPT Fri Aug 25 00:18:56 CEST 2006 i686 Intel(R) Pentium(R) 4 CPU 3.20GHz GenuineIntel GNU/Linux gcc version 4.1.1 (Gentoo 4.1.1) and Thread model: posix Problem Description: I have unloaded radeon module and then drm with the command modprobe -r radeon drm. This is what I found later on screen: (this was happened 2 times) First: BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000 printing eip: f989bfda *pde = 00000000 Oops: 0000 [#1] PREEMPT SMP Modules linked in: radeon drm usbhid CPU: 0 EIP: 0060:[pg0+960786394/1069192192] Not tainted VLI EIP: 0060:[<f989bfda>] Not tainted VLI EFLAGS: 00010293 (2.6.17.11 #1) EIP is at drm_lastclose+0xb3/0x36b [drm] eax: 00000000 ebx: f721a400 ecx: 00000000 edx: 00000000 esi: f721a400 edi: fffffff4 ebp: 00000000 esp: e8127f08 ds: 007b es: 007b ss: 0068 Process modprobe (pid: 19630, threadinfo=e8126000 task=c1a33540) Stack: 00000000 e8126000 00000202 f721a41c f721a400 00000000 f9a1c7a0 00000000 f98a21b3 00100100 00200200 f6c96030 f721a400 00000000 f98a2369 c012c917 00000001 00000080 f9a1d900 e8126000 c0133979 65646172 00006e6f f72abc7c Call Trace: <f98a21b3> drm_cleanup+0x24/0x16f [drm] <f98a2369> drm_exit+0x6b/0xb9 [drm] <c012c917> kthread_stop_sem+0xa1/0xb3 <c0133979> sys_delete_module+0x13d/0x19a <c0145513> remove_vma+0x31/0x36 <c0145ebf> do_munmap+0x16e/0x1c3 <c0102b63> sysenter_past_esp+0x54/0x75 Code: 74 20 31 c0 b9 ff ff ff ff f2 ae f7 d1 49 8b 06 e8 be 37 8b c6 c7 06 00 00 00 00 c7 46 04 00 00 00 00 8b be dc 00 00 00 83 ef 0c <8b> 47 0c 8d 4f 0c 8d 96 dc 00 00 00 89 54 24 08 39 ca 74 45 8d EIP: [pg0+960786394/1069192192] drm_lastclose+0xb3/0x36b [drm] SS:ESP 0068:e8127f08 EIP: [<f989bfda>] drm_lastclose+0xb3/0x36b [drm] SS:ESP 0068:e8127f08 Second: BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000 printing eip: f9884fda *pde = 00000000 Oops: 0000 [#1] PREEMPT SMP Modules linked in: radeon drm usbhid CPU: 0 EIP: 0060:[pg0+960692186/1069192192] Not tainted VLI EIP: 0060:[<f9884fda>] Not tainted VLI EFLAGS: 00010293 (2.6.17.11 #1) EIP is at drm_lastclose+0xb3/0x36b [drm] eax: 00000000 ebx: f797c800 ecx: 00000000 edx: 00000000 esi: f797c800 edi: fffffff4 ebp: 00000000 esp: f7091f08 ds: 007b es: 007b ss: 0068 Process modprobe (pid: 5742, threadinfo=f7090000 task=c1a61030) Stack: 00000000 f7090000 00000202 f797c81c f797c800 00000000 f98a97a0 00000000 f988b1b3 00100100 00200200 c19c9070 f797c800 00000000 f988b369 c012c917 00000001 00000080 f98aa900 f7090000 c0133979 65646172 00006e6f f798fbcc Call Trace: <f988b1b3> drm_cleanup+0x24/0x16f [drm] <f988b369> drm_exit+0x6b/0xb9 [drm] <c012c917> kthread_stop_sem+0xa1/0xb3 <c0133979> sys_delete_module+0x13d/0x19a <c0145513> remove_vma+0x31/0x36 <c0145ebf> do_munmap+0x16e/0x1c3 <c0102b63> sysenter_past_esp+0x54/0x75 Code: 74 20 31 c0 b9 ff ff ff ff f2 ae f7 d1 49 8b 06 e8 be a7 8c c6 c7 06 00 00 00 00 c7 46 04 00 00 00 00 8b be dc 00 00 00 83 ef 0c <8b> 47 0c 8d 4f 0c 8d 96 dc 00 00 00 89 54 24 08 39 ca 74 45 8d EIP: [pg0+960692186/1069192192] drm_lastclose+0xb3/0x36b [drm] SS:ESP 0068:f7091f08 EIP: [<f9884fda>] drm_lastclose+0xb3/0x36b [drm] SS:ESP 0068:f7091f08 Steps to reproduce: On my machine, just unload the drm driver :-)
Is this bug still present in 2.6.20-rc7? Thanks.
Please reopen this bug if it's still present with kernel 2.6.20.