* Re: [x86-tip] panic during cpu_up [not found] <20080702190651.GA13252@linux.vnet.ibm.com> @ 2008-07-02 20:55 ` Dhaval Giani 2008-07-03 7:02 ` Ingo Molnar 0 siblings, 1 reply; 4+ messages in thread From: Dhaval Giani @ 2008-07-02 20:55 UTC (permalink / raw) To: Ingo Molnar, Thomas Gleixner; +Cc: Arun Bharadwaj, lkml [Missed cc'ing the LKML last time around] On Thu, Jul 03, 2008 at 12:36:51AM +0530, Dhaval Giani wrote: > Hi Ingo, Thomas, > > I am hitting this on -tip. With 200a86b5d435a217c3d77f3b53cd32cb78c1fde8 > as the top level commit. Wondering if it is known? > > I am trying to fix it atm. > > Thanks, > > Red Hat Enterprise Linux AS release 4 (Nahant Update 2) > Kernel 2.6.26-rc8-tip on an i686 > > llm11.in.ibm.com login: root > Password: > Last login: Thu Jul 3 00:30:47 on ttyS0 > You have new mail. > cd[root@llm11 ~]# cd /sys/devices/system/cpu/cpu1/ > [root@llm11 cpu1]# echo 0 > online > Breaking affinity for irq 45 > [root@llm11 cpu1]# echo 1 > online > lockdep: fixing up alternatives. > BUG: unable to handle kernel <1>BUG: unable to handle kernel NULL > pointer dereference at 00000000 > IP: [<00000000>] > *pde = 00000000 > Oops: 0000 [#1] SMP > Modules linked in: > > Pid: 0, comm: swapper Not tainted (2.6.26-rc8-tip #1) > EIP: 0060:[<00000000>] EFLAGS: 00010002 CPU: 2 > EIP is at 0x0 > EAX: c0614c00 EBX: 00000002 ECX: 0799d000 EDX: ffff3bdf > BUG: unable to handle kernel NULL pointer dereference at 00000000 > IP:ESI: 00000000 EDI: 00000000 EBP: f7cadfac ESP: f7cadfa4 > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > [<00000000>] > BUG: unable to handle kernel NULL pointer dereference*pde = 00000000 > <1>BUG: unable to handle kernel at 00000000 > IP:<0>Process swapper (pid: 0, ti=f7cac000 task=f7caaee0 > task.ti=f7cac000)NULL pointer dereference [<00000000>] > *pde = 00000000 <1>BUG: unable to handle kernel > Stack: > at 00000000 > IP:NULL pointer dereference [<00000000>] > at 00000000 > c01020c7 *pde = 00000000 <1>IP: > > [<00000000>] > 0402080c *pde = 00000000 f7cadfb4 > c040b6cf 00000000 00000000 00000000 00000000 > 00000000 00000000 00000000 00000000 00000000 00000000 000000d8 > 00000000 > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > Call Trace: > [<c01020c7>] ? cpu_idle+0x8a/0x9e > [<c040b6cf>] ? start_secondary+0xbb/0xbd > ======================= > Code: Bad EIP value. > EIP: [<00000000>] 0x0 SS:ESP 0068:f7cadfa4 > Kernel panic - not syncing: Fatal exception > Oops: 0000 [#2] SMP > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > Modules linked in: [<c01276d7>] > > panic+0x38/0xe0 > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 3 > [<c0104bcd>] EIP is at 0x0 > EAX: c0614c00 EBX: 00000003 ECX: 079a5000 EDX: ffff3bdf > ESI: 00000000 EDI: 00000000 EBP: f7cbbfac ESP: f7cbbfa4 > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > Process swapper (pid: 0, ti=f7cba000 task=f7cb8fe0 task.ti=f7cba000) > Stack: die+0x130/0x147 > c01020c7 0602080c f7cbbfb4 c040b6cf 00000000 [<c0411795>] 00000000 > 00000000 00000000 > 00000000 do_page_fault+0x3bd/0x482 > 00000000 [<c04113d8>] ? 00000000 00000000 00000000 00000000 > do_page_fault+0x0/0x482 > 000000d8 00000000 [<c040fbda>] > 00000000 error_code+0x72/0x78 > 00000000 00000000 [<c01020c7>] ? 00000000 00000000 cpu_idle+0x8a/0x9e > 00000000 00000000 > Call Trace: > [<c040b6cf>] <0> [<c01020c7>] start_secondary+0xbb/0xbd > ? ======================= > cpu_idle+0x8a/0x9e > [<c040b6cf>] ? start_secondary+0xbb/0xbd > ======================= > Code: Bad EIP value. > EIP: [<00000000>] 0x0 SS:ESP 0068:f7cbbfa4 > Oops: 0000 [#3] <0>Kernel panic - not syncing: Fatal exception > SMP Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > > [<c01276d7>] Modules linked in: > > panic+0x38/0xe0 > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > [<c0104bcd>] EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 7 > die+0x130/0x147 > EIP is at 0x0 > [<c0411795>] EAX: c0614c00 EBX: 00000007 ECX: 079c5000 EDX: ffff3bdf > ESI: 00000000 EDI: 00000000 EBP: f7d1bfac ESP: f7d1bfa4 > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > Process swapper (pid: 0, ti=f7d1a000 task=f7d18be0 > task.ti=f7d1a000)do_page_fault+0x3bd/0x482 > > Stack: [<c04113d8>] c01020c7 ? 0702080c f7d1bfb4 > do_page_fault+0x0/0x482 > c040b6cf [<c040fbda>] 00000000 00000000 error_code+0x72/0x78 > 00000000 00000000 > [<c01020c7>] ? 00000000 00000000 cpu_idle+0x8a/0x9e > 00000000 00000000 [<c040b6cf>] 00000000 00000000 000000d8 > start_secondary+0xbb/0xbd > 00000000 ======================= > > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > Call Trace: > [<c01020c7>] ? cpu_idle+0x8a/0x9e > [<c040b6cf>] ? start_secondary+0xbb/0xbd > ======================= > Code: Bad EIP value. > EIP: [<00000000>] 0x0 SS:ESP 0068:f7d1bfa4 > Kernel panic - not syncing: Fatal exception > Oops: 0000 [#4] SMP > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > Modules linked in: [<c01276d7>] > panic+0x38/0xe0 > > [<c0104bcd>] Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip > #1) > EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 4 > die+0x130/0x147 > EIP is at 0x0 > EAX: c0614c00 EBX: 00000004 ECX: 079ad000 EDX: ffff3bdf > ESI: 00000000 EDI: 00000000 EBP: f7ccbfac ESP: f7ccbfa4 > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > Process swapper (pid: 0, ti=f7cca000 task=f7cc90e0 task.ti=f7cca000) > [<c0411795>] > Stack: c01020c7 do_page_fault+0x3bd/0x482 > 0102080c [<c04113d8>] f7ccbfb4 c040b6cf 00000000 00000000 00000000 > 00000000 ? > 00000000 00000000 00000000 00000000 00000000 > do_page_fault+0x0/0x482 > 00000000 000000d8 00000000 > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > Call Trace: > [<c040fbda>] <0> [<c01020c7>] ? error_code+0x72/0x78 > [<c01020c7>] ? cpu_idle+0x8a/0x9e > cpu_idle+0x8a/0x9e > [<c040b6cf>] ? [<c040b6cf>] start_secondary+0xbb/0xbd > ======================= > start_secondary+0xbb/0xbd > ======================= > Code: Bad EIP value. > EIP: [<00000000>] 0x0 SS:ESP 0068:f7ccbfa4 > Oops: 0000 [#5] <0>Kernel panic - not syncing: Fatal exception > SMP > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > Modules linked in: [<c01276d7>] > > panic+0x38/0xe0 > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > [<c0104bcd>] EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 6 > die+0x130/0x147 > EIP is at 0x0 > EAX: c0614c00 EBX: 00000006 ECX: 079bd000 EDX: ffff3bdf > ESI: 00000000 EDI: 00000000 EBP: f7d0bfac ESP: f7d0bfa4 > [<c0411795>] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > Process swapper (pid: 0, ti=f7d0a000 task=f7d092e0 > task.ti=f7d0a000)do_page_fault+0x3bd/0x482 > > Stack: [<c04113d8>] ? c01020c7 0502080c do_page_fault+0x0/0x482 > f7d0bfb4 [<c040fbda>] c040b6cf error_code+0x72/0x78 > 00000000 [<c01020c7>] ? 00000000 cpu_idle+0x8a/0x9e > 00000000 [<c040b6cf>] 00000000 start_secondary+0xbb/0xbd > > ======================= > 00000000 00000000 00000000 00000000 00000000 00000000 000000d8 00000000 > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > Call Trace: > [<c01020c7>] ? cpu_idle+0x8a/0x9e > [<c040b6cf>] ? start_secondary+0xbb/0xbd > ======================= > Code: Bad EIP value. > EIP: [<00000000>] 0x0 SS:ESP 0068:f7d0bfa4 > Kernel panic - not syncing: Fatal exception > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > [<c01276d7>] panic+0x38/0xe0 > [<c0104bcd>] die+0x130/0x147 > [<c0411795>] do_page_fault+0x3bd/0x482 > [<c04113d8>] ? do_page_fault+0x0/0x482 > [<c040fbda>] error_code+0x72/0x78 > [<c01020c7>] ? cpu_idle+0x8a/0x9e > [<c040b6cf>] start_secondary+0xbb/0xbd > ======================= > NULL pointer dereference at 00000000 > IP: [<00000000>] > *pde = 00000000 > Oops: 0000 [#6] SMP > Modules linked in: > > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > EIP: 0060:[<00000000>] EFLAGS: 00010006 CPU: 1 > EIP is at 0x0 > EAX: c0614c00 EBX: 00000001 ECX: 07995000 EDX: ffff3bdf > ESI: 00000000 EDI: 00000000 EBP: f7c7ffb4 ESP: f7c7ffac > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > Process swapper (pid: 0, ti=f7c7e000 task=f7c7cde0 task.ti=f7c7e000) > Stack: c01020c7 0202080c f7c7ffbc c040b6cf 00000000 00000000 00000000 > 00000000 > 00000000 00000000 00000000 00000000 000000d8 00000000 00000000 > 00000000 > 00000000 00000000 00000000 00000000 00000000 > Call Trace: > [<c01020c7>] ? cpu_idle+0x8a/0x9e > [<c040b6cf>] ? start_secondary+0xbb/0xbd > ======================= > Code: Bad EIP value. > EIP: [<00000000>] 0x0 SS:ESP 0068:f7c7ffac > Kernel panic - not syncing: Fatal exception > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > [<c01276d7>] panic+0x38/0xe0 > [<c0104bcd>] die+0x130/0x147 > [<c0411795>] do_page_fault+0x3bd/0x482 > [<c04113d8>] ? do_page_fault+0x0/0x482 > [<c040fbda>] error_code+0x72/0x78 > [<c01020c7>] ? cpu_idle+0x8a/0x9e > [<c040b6cf>] start_secondary+0xbb/0xbd > ======================= > BUG: NMI Watchdog detected LOCKUP on CPU6, ip c0111959, registers: > Modules linked in: > > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > EIP: 0060:[<c0111959>] EFLAGS: 00000093 CPU: 6 > EIP is at __smp_call_function+0x5d/0x7a > EAX: 0000009e EBX: 00000005 ECX: 00000006 EDX: f7d092e0 > ESI: c01047d4 EDI: c0111a5a EBP: f7d0bf00 ESP: f7d0bed0 > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > Process swapper (pid: 0, ti=f7d0a000 task=f7d092e0 task.ti=f7d0a000) > Stack: 00000000 c0111a5a 00000000 00000000 c01047d4 00000000 c029915b > f7d0bf6c > 00000006 00000001 00000046 00000000 f7d0bf14 c0111acb 00000000 > f7d0bf6c > 00000006 f7d0bf20 c01276ee f7d0bf6c f7d0bf3c c0104bcd c04d922f > c04e06cf > Call Trace: > [<c0111a5a>] ? stop_this_cpu+0x0/0x3a > [<c01047d4>] ? show_trace+0x10/0x12 > [<c029915b>] ? do_unblank_screen+0x2a/0xf9 > [<c0111acb>] ? native_smp_send_stop+0x37/0x6a > [<c01276ee>] ? panic+0x4f/0xe0 > [<c0104bcd>] ? die+0x130/0x147 > [<c0411795>] ? do_page_fault+0x3bd/0x482 > [<c04113d8>] ? do_page_fault+0x0/0x482 > [<c040fbda>] ? error_code+0x72/0x78 > [<c01020c7>] ? cpu_idle+0x8a/0x9e > [<c040b6cf>] ? start_secondary+0xbb/0xbd > ======================= > Code: 85 c0 0f 44 75 e0 89 45 e4 8d 45 d4 a3 d4 33 62 c0 89 75 e0 0f ae > f0 0f 1f 00 8b 15 e0 69 57 c0 b8 fb 00 00 00 ff 52 78 39 5d dc <74> 04 > f3 90 eb f7 83 7d 08 00 74 09 39 5d e0 74 04 f3 90 eb f7 > So after digging around a bit, it turns out the pm_idle is NULL. For some reason it is not getting set to default_idle if nothing works. I am not sure of the path being followed, and its a bit late for me to be trying anything serious :). This seems to work as a temporary workaround, but obviously is not the right fix yet. --- arch/x86/kernel/process_32.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletion(-) Index: linux-2.6.26-rc8-tip/arch/x86/kernel/process_32.c =================================================================== --- linux-2.6.26-rc8-tip.orig/arch/x86/kernel/process_32.c +++ linux-2.6.26-rc8-tip/arch/x86/kernel/process_32.c @@ -144,7 +144,10 @@ void cpu_idle(void) __get_cpu_var(irq_stat).idle_timestamp = jiffies; /* Don't trace irqs off for idle */ stop_critical_timings(); - pm_idle(); + if (pm_idle) + pm_idle(); + else + default_idle(); start_critical_timings(); } tick_nohz_restart_sched_tick(); -- regards, Dhaval ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [x86-tip] panic during cpu_up 2008-07-02 20:55 ` [x86-tip] panic during cpu_up Dhaval Giani @ 2008-07-03 7:02 ` Ingo Molnar 2008-07-03 8:06 ` Dhaval Giani 0 siblings, 1 reply; 4+ messages in thread From: Ingo Molnar @ 2008-07-03 7:02 UTC (permalink / raw) To: Dhaval Giani; +Cc: Thomas Gleixner, Arun Bharadwaj, lkml * Dhaval Giani <dhaval@linux.vnet.ibm.com> wrote: > [Missed cc'ing the LKML last time around] > > On Thu, Jul 03, 2008 at 12:36:51AM +0530, Dhaval Giani wrote: > > Hi Ingo, Thomas, > > > > I am hitting this on -tip. With 200a86b5d435a217c3d77f3b53cd32cb78c1fde8 > > as the top level commit. Wondering if it is known? > > > > I am trying to fix it atm. > > > > Thanks, > > > > Red Hat Enterprise Linux AS release 4 (Nahant Update 2) > > Kernel 2.6.26-rc8-tip on an i686 > > > > llm11.in.ibm.com login: root > > Password: > > Last login: Thu Jul 3 00:30:47 on ttyS0 > > You have new mail. > > cd[root@llm11 ~]# cd /sys/devices/system/cpu/cpu1/ > > [root@llm11 cpu1]# echo 0 > online > > Breaking affinity for irq 45 > > [root@llm11 cpu1]# echo 1 > online > > lockdep: fixing up alternatives. > > BUG: unable to handle kernel <1>BUG: unable to handle kernel NULL > > pointer dereference at 00000000 > > IP: [<00000000>] > > *pde = 00000000 > > Oops: 0000 [#1] SMP > > Modules linked in: > > > > Pid: 0, comm: swapper Not tainted (2.6.26-rc8-tip #1) > > EIP: 0060:[<00000000>] EFLAGS: 00010002 CPU: 2 > > EIP is at 0x0 > > EAX: c0614c00 EBX: 00000002 ECX: 0799d000 EDX: ffff3bdf > > BUG: unable to handle kernel NULL pointer dereference at 00000000 > > IP:ESI: 00000000 EDI: 00000000 EBP: f7cadfac ESP: f7cadfa4 > > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > [<00000000>] > > BUG: unable to handle kernel NULL pointer dereference*pde = 00000000 > > <1>BUG: unable to handle kernel at 00000000 > > IP:<0>Process swapper (pid: 0, ti=f7cac000 task=f7caaee0 > > task.ti=f7cac000)NULL pointer dereference [<00000000>] > > *pde = 00000000 <1>BUG: unable to handle kernel > > Stack: > > at 00000000 > > IP:NULL pointer dereference [<00000000>] > > at 00000000 > > c01020c7 *pde = 00000000 <1>IP: > > > > [<00000000>] > > 0402080c *pde = 00000000 f7cadfb4 > > c040b6cf 00000000 00000000 00000000 00000000 > > 00000000 00000000 00000000 00000000 00000000 00000000 000000d8 > > 00000000 > > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > > Call Trace: > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > [<c040b6cf>] ? start_secondary+0xbb/0xbd > > ======================= > > Code: Bad EIP value. > > EIP: [<00000000>] 0x0 SS:ESP 0068:f7cadfa4 > > Kernel panic - not syncing: Fatal exception > > Oops: 0000 [#2] SMP > > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > > Modules linked in: [<c01276d7>] > > > > panic+0x38/0xe0 > > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > > EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 3 > > [<c0104bcd>] EIP is at 0x0 > > EAX: c0614c00 EBX: 00000003 ECX: 079a5000 EDX: ffff3bdf > > ESI: 00000000 EDI: 00000000 EBP: f7cbbfac ESP: f7cbbfa4 > > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > Process swapper (pid: 0, ti=f7cba000 task=f7cb8fe0 task.ti=f7cba000) > > Stack: die+0x130/0x147 > > c01020c7 0602080c f7cbbfb4 c040b6cf 00000000 [<c0411795>] 00000000 > > 00000000 00000000 > > 00000000 do_page_fault+0x3bd/0x482 > > 00000000 [<c04113d8>] ? 00000000 00000000 00000000 00000000 > > do_page_fault+0x0/0x482 > > 000000d8 00000000 [<c040fbda>] > > 00000000 error_code+0x72/0x78 > > 00000000 00000000 [<c01020c7>] ? 00000000 00000000 cpu_idle+0x8a/0x9e > > 00000000 00000000 > > Call Trace: > > [<c040b6cf>] <0> [<c01020c7>] start_secondary+0xbb/0xbd > > ? ======================= > > cpu_idle+0x8a/0x9e > > [<c040b6cf>] ? start_secondary+0xbb/0xbd > > ======================= > > Code: Bad EIP value. > > EIP: [<00000000>] 0x0 SS:ESP 0068:f7cbbfa4 > > Oops: 0000 [#3] <0>Kernel panic - not syncing: Fatal exception > > SMP Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > > > > [<c01276d7>] Modules linked in: > > > > panic+0x38/0xe0 > > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > > [<c0104bcd>] EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 7 > > die+0x130/0x147 > > EIP is at 0x0 > > [<c0411795>] EAX: c0614c00 EBX: 00000007 ECX: 079c5000 EDX: ffff3bdf > > ESI: 00000000 EDI: 00000000 EBP: f7d1bfac ESP: f7d1bfa4 > > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > Process swapper (pid: 0, ti=f7d1a000 task=f7d18be0 > > task.ti=f7d1a000)do_page_fault+0x3bd/0x482 > > > > Stack: [<c04113d8>] c01020c7 ? 0702080c f7d1bfb4 > > do_page_fault+0x0/0x482 > > c040b6cf [<c040fbda>] 00000000 00000000 error_code+0x72/0x78 > > 00000000 00000000 > > [<c01020c7>] ? 00000000 00000000 cpu_idle+0x8a/0x9e > > 00000000 00000000 [<c040b6cf>] 00000000 00000000 000000d8 > > start_secondary+0xbb/0xbd > > 00000000 ======================= > > > > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > > Call Trace: > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > [<c040b6cf>] ? start_secondary+0xbb/0xbd > > ======================= > > Code: Bad EIP value. > > EIP: [<00000000>] 0x0 SS:ESP 0068:f7d1bfa4 > > Kernel panic - not syncing: Fatal exception > > Oops: 0000 [#4] SMP > > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > > Modules linked in: [<c01276d7>] > > panic+0x38/0xe0 > > > > [<c0104bcd>] Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip > > #1) > > EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 4 > > die+0x130/0x147 > > EIP is at 0x0 > > EAX: c0614c00 EBX: 00000004 ECX: 079ad000 EDX: ffff3bdf > > ESI: 00000000 EDI: 00000000 EBP: f7ccbfac ESP: f7ccbfa4 > > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > Process swapper (pid: 0, ti=f7cca000 task=f7cc90e0 task.ti=f7cca000) > > [<c0411795>] > > Stack: c01020c7 do_page_fault+0x3bd/0x482 > > 0102080c [<c04113d8>] f7ccbfb4 c040b6cf 00000000 00000000 00000000 > > 00000000 ? > > 00000000 00000000 00000000 00000000 00000000 > > do_page_fault+0x0/0x482 > > 00000000 000000d8 00000000 > > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > > Call Trace: > > [<c040fbda>] <0> [<c01020c7>] ? error_code+0x72/0x78 > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > cpu_idle+0x8a/0x9e > > [<c040b6cf>] ? [<c040b6cf>] start_secondary+0xbb/0xbd > > ======================= > > start_secondary+0xbb/0xbd > > ======================= > > Code: Bad EIP value. > > EIP: [<00000000>] 0x0 SS:ESP 0068:f7ccbfa4 > > Oops: 0000 [#5] <0>Kernel panic - not syncing: Fatal exception > > SMP > > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > > Modules linked in: [<c01276d7>] > > > > panic+0x38/0xe0 > > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > > [<c0104bcd>] EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 6 > > die+0x130/0x147 > > EIP is at 0x0 > > EAX: c0614c00 EBX: 00000006 ECX: 079bd000 EDX: ffff3bdf > > ESI: 00000000 EDI: 00000000 EBP: f7d0bfac ESP: f7d0bfa4 > > [<c0411795>] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > Process swapper (pid: 0, ti=f7d0a000 task=f7d092e0 > > task.ti=f7d0a000)do_page_fault+0x3bd/0x482 > > > > Stack: [<c04113d8>] ? c01020c7 0502080c do_page_fault+0x0/0x482 > > f7d0bfb4 [<c040fbda>] c040b6cf error_code+0x72/0x78 > > 00000000 [<c01020c7>] ? 00000000 cpu_idle+0x8a/0x9e > > 00000000 [<c040b6cf>] 00000000 start_secondary+0xbb/0xbd > > > > ======================= > > 00000000 00000000 00000000 00000000 00000000 00000000 000000d8 00000000 > > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > > Call Trace: > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > [<c040b6cf>] ? start_secondary+0xbb/0xbd > > ======================= > > Code: Bad EIP value. > > EIP: [<00000000>] 0x0 SS:ESP 0068:f7d0bfa4 > > Kernel panic - not syncing: Fatal exception > > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > > [<c01276d7>] panic+0x38/0xe0 > > [<c0104bcd>] die+0x130/0x147 > > [<c0411795>] do_page_fault+0x3bd/0x482 > > [<c04113d8>] ? do_page_fault+0x0/0x482 > > [<c040fbda>] error_code+0x72/0x78 > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > [<c040b6cf>] start_secondary+0xbb/0xbd > > ======================= > > NULL pointer dereference at 00000000 > > IP: [<00000000>] > > *pde = 00000000 > > Oops: 0000 [#6] SMP > > Modules linked in: > > > > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > > EIP: 0060:[<00000000>] EFLAGS: 00010006 CPU: 1 > > EIP is at 0x0 > > EAX: c0614c00 EBX: 00000001 ECX: 07995000 EDX: ffff3bdf > > ESI: 00000000 EDI: 00000000 EBP: f7c7ffb4 ESP: f7c7ffac > > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > Process swapper (pid: 0, ti=f7c7e000 task=f7c7cde0 task.ti=f7c7e000) > > Stack: c01020c7 0202080c f7c7ffbc c040b6cf 00000000 00000000 00000000 > > 00000000 > > 00000000 00000000 00000000 00000000 000000d8 00000000 00000000 > > 00000000 > > 00000000 00000000 00000000 00000000 00000000 > > Call Trace: > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > [<c040b6cf>] ? start_secondary+0xbb/0xbd > > ======================= > > Code: Bad EIP value. > > EIP: [<00000000>] 0x0 SS:ESP 0068:f7c7ffac > > Kernel panic - not syncing: Fatal exception > > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > > [<c01276d7>] panic+0x38/0xe0 > > [<c0104bcd>] die+0x130/0x147 > > [<c0411795>] do_page_fault+0x3bd/0x482 > > [<c04113d8>] ? do_page_fault+0x0/0x482 > > [<c040fbda>] error_code+0x72/0x78 > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > [<c040b6cf>] start_secondary+0xbb/0xbd > > ======================= > > BUG: NMI Watchdog detected LOCKUP on CPU6, ip c0111959, registers: > > Modules linked in: > > > > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > > EIP: 0060:[<c0111959>] EFLAGS: 00000093 CPU: 6 > > EIP is at __smp_call_function+0x5d/0x7a > > EAX: 0000009e EBX: 00000005 ECX: 00000006 EDX: f7d092e0 > > ESI: c01047d4 EDI: c0111a5a EBP: f7d0bf00 ESP: f7d0bed0 > > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > Process swapper (pid: 0, ti=f7d0a000 task=f7d092e0 task.ti=f7d0a000) > > Stack: 00000000 c0111a5a 00000000 00000000 c01047d4 00000000 c029915b > > f7d0bf6c > > 00000006 00000001 00000046 00000000 f7d0bf14 c0111acb 00000000 > > f7d0bf6c > > 00000006 f7d0bf20 c01276ee f7d0bf6c f7d0bf3c c0104bcd c04d922f > > c04e06cf > > Call Trace: > > [<c0111a5a>] ? stop_this_cpu+0x0/0x3a > > [<c01047d4>] ? show_trace+0x10/0x12 > > [<c029915b>] ? do_unblank_screen+0x2a/0xf9 > > [<c0111acb>] ? native_smp_send_stop+0x37/0x6a > > [<c01276ee>] ? panic+0x4f/0xe0 > > [<c0104bcd>] ? die+0x130/0x147 > > [<c0411795>] ? do_page_fault+0x3bd/0x482 > > [<c04113d8>] ? do_page_fault+0x0/0x482 > > [<c040fbda>] ? error_code+0x72/0x78 > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > [<c040b6cf>] ? start_secondary+0xbb/0xbd > > ======================= > > Code: 85 c0 0f 44 75 e0 89 45 e4 8d 45 d4 a3 d4 33 62 c0 89 75 e0 0f ae > > f0 0f 1f 00 8b 15 e0 69 57 c0 b8 fb 00 00 00 ff 52 78 39 5d dc <74> 04 > > f3 90 eb f7 83 7d 08 00 74 09 39 5d e0 74 04 f3 90 eb f7 > > > > So after digging around a bit, it turns out the pm_idle is NULL. For > some reason it is not getting set to default_idle if nothing works. I am > not sure of the path being followed, and its a bit late for me to be > trying anything serious :). > > This seems to work as a temporary workaround, but obviously is not the > right fix yet. hm, interesting - this is a new bug. I'm wondering where that NULL came from. x86 boot itself does not leave room for pm_idle to be NULL AFAICS. One suspect would be cpuidle: void cpuidle_uninstall_idle_handler(void) { if (enabled_devices && (pm_idle != pm_idle_old)) { pm_idle = pm_idle_old; cpuidle_kick_cpus(); The other suspect would be acpi idle: /* Fall back to the default idle loop */ pm_idle = pm_idle_save; Could you try latest tip/master or the debug patch below? It should show where the NULL comes from, without crashing. A third possibility is if pm_idle itself got genuinely corrupted via something else. In that case you should get a warning from process*.c. Ingo --------------------> commit 3d02d03d4974e0776baf2bc03cbb71d4d670aa85 Author: Ingo Molnar <mingo@elte.hu> Date: Thu Jul 3 08:52:57 2008 +0200 debug: "[x86-tip] panic during cpu_up" Dhaval Giani wrote: > I am hitting this on -tip. With 200a86b5d435a217c3d77f3b53cd32cb78c1fde8 > as the top level commit. Wondering if it is known? > > I am trying to fix it atm. > > Thanks, > > Red Hat Enterprise Linux AS release 4 (Nahant Update 2) > Kernel 2.6.26-rc8-tip on an i686 > > llm11.in.ibm.com login: root > Password: > Last login: Thu Jul 3 00:30:47 on ttyS0 > You have new mail. > cd[root@llm11 ~]# cd /sys/devices/system/cpu/cpu1/ > [root@llm11 cpu1]# echo 0 > online > Breaking affinity for irq 45 > [root@llm11 cpu1]# echo 1 > online > lockdep: fixing up alternatives. > BUG: unable to handle kernel <1>BUG: unable to handle kernel NULL > pointer dereference at 00000000 > IP: [<00000000>] > *pde = 00000000 > Oops: 0000 [#1] SMP > Modules linked in: > > Pid: 0, comm: swapper Not tainted (2.6.26-rc8-tip #1) > EIP: 0060:[<00000000>] EFLAGS: 00010002 CPU: 2 > EIP is at 0x0 > EAX: c0614c00 EBX: 00000002 ECX: 0799d000 EDX: ffff3bdf > BUG: unable to handle kernel NULL pointer dereference at 00000000 > IP:ESI: 00000000 EDI: 00000000 EBP: f7cadfac ESP: f7cadfa4 > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > [<00000000>] > BUG: unable to handle kernel NULL pointer dereference*pde = 00000000 > <1>BUG: unable to handle kernel at 00000000 > IP:<0>Process swapper (pid: 0, ti=f7cac000 task=f7caaee0 > task.ti=f7cac000)NULL pointer dereference [<00000000>] > *pde = 00000000 <1>BUG: unable to handle kernel > Stack: > at 00000000 > IP:NULL pointer dereference [<00000000>] > at 00000000 > c01020c7 *pde = 00000000 <1>IP: > > [<00000000>] > 0402080c *pde = 00000000 f7cadfb4 > c040b6cf 00000000 00000000 00000000 00000000 > 00000000 00000000 00000000 00000000 00000000 00000000 000000d8 > 00000000 > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > Call Trace: > [<c01020c7>] ? cpu_idle+0x8a/0x9e > [<c040b6cf>] ? start_secondary+0xbb/0xbd > ======================= > Code: Bad EIP value. > EIP: [<00000000>] 0x0 SS:ESP 0068:f7cadfa4 > Kernel panic - not syncing: Fatal exception > Oops: 0000 [#2] SMP > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > Modules linked in: [<c01276d7>] > > panic+0x38/0xe0 > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 3 > [<c0104bcd>] EIP is at 0x0 > EAX: c0614c00 EBX: 00000003 ECX: 079a5000 EDX: ffff3bdf > ESI: 00000000 EDI: 00000000 EBP: f7cbbfac ESP: f7cbbfa4 > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > Process swapper (pid: 0, ti=f7cba000 task=f7cb8fe0 task.ti=f7cba000) > Stack: die+0x130/0x147 > c01020c7 0602080c f7cbbfb4 c040b6cf 00000000 [<c0411795>] 00000000 > 00000000 00000000 > 00000000 do_page_fault+0x3bd/0x482 > 00000000 [<c04113d8>] ? 00000000 00000000 00000000 00000000 > do_page_fault+0x0/0x482 > 000000d8 00000000 [<c040fbda>] > 00000000 error_code+0x72/0x78 > 00000000 00000000 [<c01020c7>] ? 00000000 00000000 cpu_idle+0x8a/0x9e > 00000000 00000000 > Call Trace: > [<c040b6cf>] <0> [<c01020c7>] start_secondary+0xbb/0xbd > ? ======================= > cpu_idle+0x8a/0x9e > [<c040b6cf>] ? start_secondary+0xbb/0xbd > ======================= > Code: Bad EIP value. > EIP: [<00000000>] 0x0 SS:ESP 0068:f7cbbfa4 > Oops: 0000 [#3] <0>Kernel panic - not syncing: Fatal exception > SMP Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > > [<c01276d7>] Modules linked in: > > panic+0x38/0xe0 > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > [<c0104bcd>] EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 7 > die+0x130/0x147 > EIP is at 0x0 > [<c0411795>] EAX: c0614c00 EBX: 00000007 ECX: 079c5000 EDX: ffff3bdf > ESI: 00000000 EDI: 00000000 EBP: f7d1bfac ESP: f7d1bfa4 > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > Process swapper (pid: 0, ti=f7d1a000 task=f7d18be0 > task.ti=f7d1a000)do_page_fault+0x3bd/0x482 > > Stack: [<c04113d8>] c01020c7 ? 0702080c f7d1bfb4 > do_page_fault+0x0/0x482 > c040b6cf [<c040fbda>] 00000000 00000000 error_code+0x72/0x78 > 00000000 00000000 > [<c01020c7>] ? 00000000 00000000 cpu_idle+0x8a/0x9e > 00000000 00000000 [<c040b6cf>] 00000000 00000000 000000d8 > start_secondary+0xbb/0xbd > 00000000 ======================= > > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > Call Trace: > [<c01020c7>] ? cpu_idle+0x8a/0x9e > [<c040b6cf>] ? start_secondary+0xbb/0xbd > ======================= > Code: Bad EIP value. > EIP: [<00000000>] 0x0 SS:ESP 0068:f7d1bfa4 > Kernel panic - not syncing: Fatal exception > Oops: 0000 [#4] SMP > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > Modules linked in: [<c01276d7>] > panic+0x38/0xe0 > > [<c0104bcd>] Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip > #1) > EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 4 > die+0x130/0x147 > EIP is at 0x0 > EAX: c0614c00 EBX: 00000004 ECX: 079ad000 EDX: ffff3bdf > ESI: 00000000 EDI: 00000000 EBP: f7ccbfac ESP: f7ccbfa4 > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > Process swapper (pid: 0, ti=f7cca000 task=f7cc90e0 task.ti=f7cca000) > [<c0411795>] > Stack: c01020c7 do_page_fault+0x3bd/0x482 > 0102080c [<c04113d8>] f7ccbfb4 c040b6cf 00000000 00000000 00000000 > 00000000 ? > 00000000 00000000 00000000 00000000 00000000 > do_page_fault+0x0/0x482 > 00000000 000000d8 00000000 > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > Call Trace: > [<c040fbda>] <0> [<c01020c7>] ? error_code+0x72/0x78 > [<c01020c7>] ? cpu_idle+0x8a/0x9e > cpu_idle+0x8a/0x9e > [<c040b6cf>] ? [<c040b6cf>] start_secondary+0xbb/0xbd > ======================= > start_secondary+0xbb/0xbd > ======================= > Code: Bad EIP value. > EIP: [<00000000>] 0x0 SS:ESP 0068:f7ccbfa4 > Oops: 0000 [#5] <0>Kernel panic - not syncing: Fatal exception > SMP > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > Modules linked in: [<c01276d7>] > > panic+0x38/0xe0 > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > [<c0104bcd>] EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 6 > die+0x130/0x147 > EIP is at 0x0 > EAX: c0614c00 EBX: 00000006 ECX: 079bd000 EDX: ffff3bdf > ESI: 00000000 EDI: 00000000 EBP: f7d0bfac ESP: f7d0bfa4 > [<c0411795>] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > Process swapper (pid: 0, ti=f7d0a000 task=f7d092e0 > task.ti=f7d0a000)do_page_fault+0x3bd/0x482 > > Stack: [<c04113d8>] ? c01020c7 0502080c do_page_fault+0x0/0x482 > f7d0bfb4 [<c040fbda>] c040b6cf error_code+0x72/0x78 > 00000000 [<c01020c7>] ? 00000000 cpu_idle+0x8a/0x9e > 00000000 [<c040b6cf>] 00000000 start_secondary+0xbb/0xbd > > ======================= > 00000000 00000000 00000000 00000000 00000000 00000000 000000d8 00000000 > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > Call Trace: > [<c01020c7>] ? cpu_idle+0x8a/0x9e > [<c040b6cf>] ? start_secondary+0xbb/0xbd > ======================= > Code: Bad EIP value. > EIP: [<00000000>] 0x0 SS:ESP 0068:f7d0bfa4 > Kernel panic - not syncing: Fatal exception > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > [<c01276d7>] panic+0x38/0xe0 > [<c0104bcd>] die+0x130/0x147 > [<c0411795>] do_page_fault+0x3bd/0x482 > [<c04113d8>] ? do_page_fault+0x0/0x482 > [<c040fbda>] error_code+0x72/0x78 > [<c01020c7>] ? cpu_idle+0x8a/0x9e > [<c040b6cf>] start_secondary+0xbb/0xbd > ======================= > NULL pointer dereference at 00000000 > IP: [<00000000>] > *pde = 00000000 > Oops: 0000 [#6] SMP > Modules linked in: > > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > EIP: 0060:[<00000000>] EFLAGS: 00010006 CPU: 1 > EIP is at 0x0 > EAX: c0614c00 EBX: 00000001 ECX: 07995000 EDX: ffff3bdf > ESI: 00000000 EDI: 00000000 EBP: f7c7ffb4 ESP: f7c7ffac > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > Process swapper (pid: 0, ti=f7c7e000 task=f7c7cde0 task.ti=f7c7e000) > Stack: c01020c7 0202080c f7c7ffbc c040b6cf 00000000 00000000 00000000 > 00000000 > 00000000 00000000 00000000 00000000 000000d8 00000000 00000000 > 00000000 > 00000000 00000000 00000000 00000000 00000000 > Call Trace: > [<c01020c7>] ? cpu_idle+0x8a/0x9e > [<c040b6cf>] ? start_secondary+0xbb/0xbd > ======================= > Code: Bad EIP value. > EIP: [<00000000>] 0x0 SS:ESP 0068:f7c7ffac > Kernel panic - not syncing: Fatal exception > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > [<c01276d7>] panic+0x38/0xe0 > [<c0104bcd>] die+0x130/0x147 > [<c0411795>] do_page_fault+0x3bd/0x482 > [<c04113d8>] ? do_page_fault+0x0/0x482 > [<c040fbda>] error_code+0x72/0x78 > [<c01020c7>] ? cpu_idle+0x8a/0x9e > [<c040b6cf>] start_secondary+0xbb/0xbd > ======================= > BUG: NMI Watchdog detected LOCKUP on CPU6, ip c0111959, registers: > Modules linked in: > > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > EIP: 0060:[<c0111959>] EFLAGS: 00000093 CPU: 6 > EIP is at __smp_call_function+0x5d/0x7a > EAX: 0000009e EBX: 00000005 ECX: 00000006 EDX: f7d092e0 > ESI: c01047d4 EDI: c0111a5a EBP: f7d0bf00 ESP: f7d0bed0 > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > Process swapper (pid: 0, ti=f7d0a000 task=f7d092e0 task.ti=f7d0a000) > Stack: 00000000 c0111a5a 00000000 00000000 c01047d4 00000000 c029915b > f7d0bf6c > 00000006 00000001 00000046 00000000 f7d0bf14 c0111acb 00000000 > f7d0bf6c > 00000006 f7d0bf20 c01276ee f7d0bf6c f7d0bf3c c0104bcd c04d922f > c04e06cf > Call Trace: > [<c0111a5a>] ? stop_this_cpu+0x0/0x3a > [<c01047d4>] ? show_trace+0x10/0x12 > [<c029915b>] ? do_unblank_screen+0x2a/0xf9 > [<c0111acb>] ? native_smp_send_stop+0x37/0x6a > [<c01276ee>] ? panic+0x4f/0xe0 > [<c0104bcd>] ? die+0x130/0x147 > [<c0411795>] ? do_page_fault+0x3bd/0x482 > [<c04113d8>] ? do_page_fault+0x0/0x482 > [<c040fbda>] ? error_code+0x72/0x78 > [<c01020c7>] ? cpu_idle+0x8a/0x9e > [<c040b6cf>] ? start_secondary+0xbb/0xbd > ======================= > Code: 85 c0 0f 44 75 e0 89 45 e4 8d 45 d4 a3 d4 33 62 c0 89 75 e0 0f ae > f0 0f 1f 00 8b 15 e0 69 57 c0 b8 fb 00 00 00 ff 52 78 39 5d dc <74> 04 > f3 90 eb f7 83 7d 08 00 74 09 39 5d e0 74 04 f3 90 eb f7 > > > So after digging around a bit, it turns out the pm_idle is NULL. For > some reason it is not getting set to default_idle if nothing works. Signed-off-by: Ingo Molnar <mingo@elte.hu> diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c index 28e77d2..75755e2 100644 --- a/arch/x86/kernel/process_32.c +++ b/arch/x86/kernel/process_32.c @@ -144,6 +144,8 @@ void cpu_idle(void) __get_cpu_var(irq_stat).idle_timestamp = jiffies; /* Don't trace irqs off for idle */ stop_critical_timings(); + if (WARN_ON_ONCE(!pm_idle)) + pm_idle = default_idle; pm_idle(); start_critical_timings(); } diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 395a72f..f07278f 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -148,6 +148,8 @@ void cpu_idle(void) enter_idle(); /* Don't trace irqs off for idle */ stop_critical_timings(); + if (WARN_ON_ONCE(!pm_idle)) + pm_idle = default_idle; pm_idle(); start_critical_timings(); /* In many cases the interrupt that ended idle diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 4976e5d..ff57bb2 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -1313,7 +1313,9 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr) return -ENODEV; /* Fall back to the default idle loop */ - pm_idle = pm_idle_save; + WARN_ON_ONCE(!pm_idle_save); + if (pm_idle_save) + pm_idle = pm_idle_save; synchronize_sched(); /* Relies on interrupts forcing exit from idle. */ pr->flags.power = 0; @@ -1864,7 +1866,9 @@ int acpi_processor_power_exit(struct acpi_processor *pr, /* Unregister the idle handler when processor #0 is removed. */ if (pr->id == 0) { - pm_idle = pm_idle_save; + WARN_ON_ONCE(!pm_idle_save); + if (pm_idle_save) + pm_idle = pm_idle_save; /* * We are about to unload the current idle thread pm callback diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 5405769..bb0ba6e 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -95,7 +95,9 @@ void cpuidle_install_idle_handler(void) void cpuidle_uninstall_idle_handler(void) { if (enabled_devices && (pm_idle != pm_idle_old)) { - pm_idle = pm_idle_old; + WARN_ON_ONCE(!pm_idle_old); + if (pm_idle_old) + pm_idle = pm_idle_old; cpuidle_kick_cpus(); } } ^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [x86-tip] panic during cpu_up 2008-07-03 7:02 ` Ingo Molnar @ 2008-07-03 8:06 ` Dhaval Giani 2008-07-03 16:30 ` Dhaval Giani 0 siblings, 1 reply; 4+ messages in thread From: Dhaval Giani @ 2008-07-03 8:06 UTC (permalink / raw) To: Ingo Molnar; +Cc: Thomas Gleixner, Arun Bharadwaj, lkml On Thu, Jul 03, 2008 at 09:02:42AM +0200, Ingo Molnar wrote: > > * Dhaval Giani <dhaval@linux.vnet.ibm.com> wrote: > > > [Missed cc'ing the LKML last time around] > > > > On Thu, Jul 03, 2008 at 12:36:51AM +0530, Dhaval Giani wrote: > > > Hi Ingo, Thomas, > > > > > > I am hitting this on -tip. With 200a86b5d435a217c3d77f3b53cd32cb78c1fde8 > > > as the top level commit. Wondering if it is known? > > > > > > I am trying to fix it atm. > > > > > > Thanks, > > > > > > Red Hat Enterprise Linux AS release 4 (Nahant Update 2) > > > Kernel 2.6.26-rc8-tip on an i686 > > > > > > llm11.in.ibm.com login: root > > > Password: > > > Last login: Thu Jul 3 00:30:47 on ttyS0 > > > You have new mail. > > > cd[root@llm11 ~]# cd /sys/devices/system/cpu/cpu1/ > > > [root@llm11 cpu1]# echo 0 > online > > > Breaking affinity for irq 45 > > > [root@llm11 cpu1]# echo 1 > online > > > lockdep: fixing up alternatives. > > > BUG: unable to handle kernel <1>BUG: unable to handle kernel NULL > > > pointer dereference at 00000000 > > > IP: [<00000000>] > > > *pde = 00000000 > > > Oops: 0000 [#1] SMP > > > Modules linked in: > > > > > > Pid: 0, comm: swapper Not tainted (2.6.26-rc8-tip #1) > > > EIP: 0060:[<00000000>] EFLAGS: 00010002 CPU: 2 > > > EIP is at 0x0 > > > EAX: c0614c00 EBX: 00000002 ECX: 0799d000 EDX: ffff3bdf > > > BUG: unable to handle kernel NULL pointer dereference at 00000000 > > > IP:ESI: 00000000 EDI: 00000000 EBP: f7cadfac ESP: f7cadfa4 > > > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > > [<00000000>] > > > BUG: unable to handle kernel NULL pointer dereference*pde = 00000000 > > > <1>BUG: unable to handle kernel at 00000000 > > > IP:<0>Process swapper (pid: 0, ti=f7cac000 task=f7caaee0 > > > task.ti=f7cac000)NULL pointer dereference [<00000000>] > > > *pde = 00000000 <1>BUG: unable to handle kernel > > > Stack: > > > at 00000000 > > > IP:NULL pointer dereference [<00000000>] > > > at 00000000 > > > c01020c7 *pde = 00000000 <1>IP: > > > > > > [<00000000>] > > > 0402080c *pde = 00000000 f7cadfb4 > > > c040b6cf 00000000 00000000 00000000 00000000 > > > 00000000 00000000 00000000 00000000 00000000 00000000 000000d8 > > > 00000000 > > > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > > > Call Trace: > > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > > [<c040b6cf>] ? start_secondary+0xbb/0xbd > > > ======================= > > > Code: Bad EIP value. > > > EIP: [<00000000>] 0x0 SS:ESP 0068:f7cadfa4 > > > Kernel panic - not syncing: Fatal exception > > > Oops: 0000 [#2] SMP > > > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > > > Modules linked in: [<c01276d7>] > > > > > > panic+0x38/0xe0 > > > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > > > EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 3 > > > [<c0104bcd>] EIP is at 0x0 > > > EAX: c0614c00 EBX: 00000003 ECX: 079a5000 EDX: ffff3bdf > > > ESI: 00000000 EDI: 00000000 EBP: f7cbbfac ESP: f7cbbfa4 > > > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > > Process swapper (pid: 0, ti=f7cba000 task=f7cb8fe0 task.ti=f7cba000) > > > Stack: die+0x130/0x147 > > > c01020c7 0602080c f7cbbfb4 c040b6cf 00000000 [<c0411795>] 00000000 > > > 00000000 00000000 > > > 00000000 do_page_fault+0x3bd/0x482 > > > 00000000 [<c04113d8>] ? 00000000 00000000 00000000 00000000 > > > do_page_fault+0x0/0x482 > > > 000000d8 00000000 [<c040fbda>] > > > 00000000 error_code+0x72/0x78 > > > 00000000 00000000 [<c01020c7>] ? 00000000 00000000 cpu_idle+0x8a/0x9e > > > 00000000 00000000 > > > Call Trace: > > > [<c040b6cf>] <0> [<c01020c7>] start_secondary+0xbb/0xbd > > > ? ======================= > > > cpu_idle+0x8a/0x9e > > > [<c040b6cf>] ? start_secondary+0xbb/0xbd > > > ======================= > > > Code: Bad EIP value. > > > EIP: [<00000000>] 0x0 SS:ESP 0068:f7cbbfa4 > > > Oops: 0000 [#3] <0>Kernel panic - not syncing: Fatal exception > > > SMP Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > > > > > > [<c01276d7>] Modules linked in: > > > > > > panic+0x38/0xe0 > > > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > > > [<c0104bcd>] EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 7 > > > die+0x130/0x147 > > > EIP is at 0x0 > > > [<c0411795>] EAX: c0614c00 EBX: 00000007 ECX: 079c5000 EDX: ffff3bdf > > > ESI: 00000000 EDI: 00000000 EBP: f7d1bfac ESP: f7d1bfa4 > > > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > > Process swapper (pid: 0, ti=f7d1a000 task=f7d18be0 > > > task.ti=f7d1a000)do_page_fault+0x3bd/0x482 > > > > > > Stack: [<c04113d8>] c01020c7 ? 0702080c f7d1bfb4 > > > do_page_fault+0x0/0x482 > > > c040b6cf [<c040fbda>] 00000000 00000000 error_code+0x72/0x78 > > > 00000000 00000000 > > > [<c01020c7>] ? 00000000 00000000 cpu_idle+0x8a/0x9e > > > 00000000 00000000 [<c040b6cf>] 00000000 00000000 000000d8 > > > start_secondary+0xbb/0xbd > > > 00000000 ======================= > > > > > > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > > > Call Trace: > > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > > [<c040b6cf>] ? start_secondary+0xbb/0xbd > > > ======================= > > > Code: Bad EIP value. > > > EIP: [<00000000>] 0x0 SS:ESP 0068:f7d1bfa4 > > > Kernel panic - not syncing: Fatal exception > > > Oops: 0000 [#4] SMP > > > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > > > Modules linked in: [<c01276d7>] > > > panic+0x38/0xe0 > > > > > > [<c0104bcd>] Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip > > > #1) > > > EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 4 > > > die+0x130/0x147 > > > EIP is at 0x0 > > > EAX: c0614c00 EBX: 00000004 ECX: 079ad000 EDX: ffff3bdf > > > ESI: 00000000 EDI: 00000000 EBP: f7ccbfac ESP: f7ccbfa4 > > > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > > Process swapper (pid: 0, ti=f7cca000 task=f7cc90e0 task.ti=f7cca000) > > > [<c0411795>] > > > Stack: c01020c7 do_page_fault+0x3bd/0x482 > > > 0102080c [<c04113d8>] f7ccbfb4 c040b6cf 00000000 00000000 00000000 > > > 00000000 ? > > > 00000000 00000000 00000000 00000000 00000000 > > > do_page_fault+0x0/0x482 > > > 00000000 000000d8 00000000 > > > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > > > Call Trace: > > > [<c040fbda>] <0> [<c01020c7>] ? error_code+0x72/0x78 > > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > > cpu_idle+0x8a/0x9e > > > [<c040b6cf>] ? [<c040b6cf>] start_secondary+0xbb/0xbd > > > ======================= > > > start_secondary+0xbb/0xbd > > > ======================= > > > Code: Bad EIP value. > > > EIP: [<00000000>] 0x0 SS:ESP 0068:f7ccbfa4 > > > Oops: 0000 [#5] <0>Kernel panic - not syncing: Fatal exception > > > SMP > > > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > > > Modules linked in: [<c01276d7>] > > > > > > panic+0x38/0xe0 > > > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > > > [<c0104bcd>] EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 6 > > > die+0x130/0x147 > > > EIP is at 0x0 > > > EAX: c0614c00 EBX: 00000006 ECX: 079bd000 EDX: ffff3bdf > > > ESI: 00000000 EDI: 00000000 EBP: f7d0bfac ESP: f7d0bfa4 > > > [<c0411795>] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > > Process swapper (pid: 0, ti=f7d0a000 task=f7d092e0 > > > task.ti=f7d0a000)do_page_fault+0x3bd/0x482 > > > > > > Stack: [<c04113d8>] ? c01020c7 0502080c do_page_fault+0x0/0x482 > > > f7d0bfb4 [<c040fbda>] c040b6cf error_code+0x72/0x78 > > > 00000000 [<c01020c7>] ? 00000000 cpu_idle+0x8a/0x9e > > > 00000000 [<c040b6cf>] 00000000 start_secondary+0xbb/0xbd > > > > > > ======================= > > > 00000000 00000000 00000000 00000000 00000000 00000000 000000d8 00000000 > > > 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > > > Call Trace: > > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > > [<c040b6cf>] ? start_secondary+0xbb/0xbd > > > ======================= > > > Code: Bad EIP value. > > > EIP: [<00000000>] 0x0 SS:ESP 0068:f7d0bfa4 > > > Kernel panic - not syncing: Fatal exception > > > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > > > [<c01276d7>] panic+0x38/0xe0 > > > [<c0104bcd>] die+0x130/0x147 > > > [<c0411795>] do_page_fault+0x3bd/0x482 > > > [<c04113d8>] ? do_page_fault+0x0/0x482 > > > [<c040fbda>] error_code+0x72/0x78 > > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > > [<c040b6cf>] start_secondary+0xbb/0xbd > > > ======================= > > > NULL pointer dereference at 00000000 > > > IP: [<00000000>] > > > *pde = 00000000 > > > Oops: 0000 [#6] SMP > > > Modules linked in: > > > > > > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > > > EIP: 0060:[<00000000>] EFLAGS: 00010006 CPU: 1 > > > EIP is at 0x0 > > > EAX: c0614c00 EBX: 00000001 ECX: 07995000 EDX: ffff3bdf > > > ESI: 00000000 EDI: 00000000 EBP: f7c7ffb4 ESP: f7c7ffac > > > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > > Process swapper (pid: 0, ti=f7c7e000 task=f7c7cde0 task.ti=f7c7e000) > > > Stack: c01020c7 0202080c f7c7ffbc c040b6cf 00000000 00000000 00000000 > > > 00000000 > > > 00000000 00000000 00000000 00000000 000000d8 00000000 00000000 > > > 00000000 > > > 00000000 00000000 00000000 00000000 00000000 > > > Call Trace: > > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > > [<c040b6cf>] ? start_secondary+0xbb/0xbd > > > ======================= > > > Code: Bad EIP value. > > > EIP: [<00000000>] 0x0 SS:ESP 0068:f7c7ffac > > > Kernel panic - not syncing: Fatal exception > > > Pid: 0, comm: swapper Tainted: G D 2.6.26-rc8-tip #1 > > > [<c01276d7>] panic+0x38/0xe0 > > > [<c0104bcd>] die+0x130/0x147 > > > [<c0411795>] do_page_fault+0x3bd/0x482 > > > [<c04113d8>] ? do_page_fault+0x0/0x482 > > > [<c040fbda>] error_code+0x72/0x78 > > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > > [<c040b6cf>] start_secondary+0xbb/0xbd > > > ======================= > > > BUG: NMI Watchdog detected LOCKUP on CPU6, ip c0111959, registers: > > > Modules linked in: > > > > > > Pid: 0, comm: swapper Tainted: G D (2.6.26-rc8-tip #1) > > > EIP: 0060:[<c0111959>] EFLAGS: 00000093 CPU: 6 > > > EIP is at __smp_call_function+0x5d/0x7a > > > EAX: 0000009e EBX: 00000005 ECX: 00000006 EDX: f7d092e0 > > > ESI: c01047d4 EDI: c0111a5a EBP: f7d0bf00 ESP: f7d0bed0 > > > DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > > Process swapper (pid: 0, ti=f7d0a000 task=f7d092e0 task.ti=f7d0a000) > > > Stack: 00000000 c0111a5a 00000000 00000000 c01047d4 00000000 c029915b > > > f7d0bf6c > > > 00000006 00000001 00000046 00000000 f7d0bf14 c0111acb 00000000 > > > f7d0bf6c > > > 00000006 f7d0bf20 c01276ee f7d0bf6c f7d0bf3c c0104bcd c04d922f > > > c04e06cf > > > Call Trace: > > > [<c0111a5a>] ? stop_this_cpu+0x0/0x3a > > > [<c01047d4>] ? show_trace+0x10/0x12 > > > [<c029915b>] ? do_unblank_screen+0x2a/0xf9 > > > [<c0111acb>] ? native_smp_send_stop+0x37/0x6a > > > [<c01276ee>] ? panic+0x4f/0xe0 > > > [<c0104bcd>] ? die+0x130/0x147 > > > [<c0411795>] ? do_page_fault+0x3bd/0x482 > > > [<c04113d8>] ? do_page_fault+0x0/0x482 > > > [<c040fbda>] ? error_code+0x72/0x78 > > > [<c01020c7>] ? cpu_idle+0x8a/0x9e > > > [<c040b6cf>] ? start_secondary+0xbb/0xbd > > > ======================= > > > Code: 85 c0 0f 44 75 e0 89 45 e4 8d 45 d4 a3 d4 33 62 c0 89 75 e0 0f ae > > > f0 0f 1f 00 8b 15 e0 69 57 c0 b8 fb 00 00 00 ff 52 78 39 5d dc <74> 04 > > > f3 90 eb f7 83 7d 08 00 74 09 39 5d e0 74 04 f3 90 eb f7 > > > > > > > So after digging around a bit, it turns out the pm_idle is NULL. For > > some reason it is not getting set to default_idle if nothing works. I am > > not sure of the path being followed, and its a bit late for me to be > > trying anything serious :). > > > > This seems to work as a temporary workaround, but obviously is not the > > right fix yet. > > hm, interesting - this is a new bug. I'm wondering where that NULL came > from. x86 boot itself does not leave room for pm_idle to be NULL AFAICS. > Well, it is not null at boot time, since the system does boot up. It is lost (corrupted?) sometime later. > One suspect would be cpuidle: > > void cpuidle_uninstall_idle_handler(void) > { > if (enabled_devices && (pm_idle != pm_idle_old)) { > pm_idle = pm_idle_old; > cpuidle_kick_cpus(); > > The other suspect would be acpi idle: > > /* Fall back to the default idle loop */ > pm_idle = pm_idle_save; > > Could you try latest tip/master or the debug patch below? It should show > where the NULL comes from, without crashing. > Sure, will give it a run sometime soon. thanks, -- regards, Dhaval ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [x86-tip] panic during cpu_up 2008-07-03 8:06 ` Dhaval Giani @ 2008-07-03 16:30 ` Dhaval Giani 0 siblings, 0 replies; 4+ messages in thread From: Dhaval Giani @ 2008-07-03 16:30 UTC (permalink / raw) To: Ingo Molnar; +Cc: Thomas Gleixner, Arun Bharadwaj, lkml > > > > The other suspect would be acpi idle: > > > > /* Fall back to the default idle loop */ > > pm_idle = pm_idle_save; > > Yep, you are right. > > Could you try latest tip/master or the debug patch below? It should show > > where the NULL comes from, without crashing. > > > > Sure, will give it a run sometime soon. > ------------[ cut here ]------------ WARNING: at drivers/acpi/processor_idle.c:1316 acpi_processor_cst_has_changed+0x64/0xc0() Modules linked in: Pid: 4433, comm: bash Not tainted 2.6.26-rc8-tip #15 [<c0127a0a>] warn_on_slowpath+0x41/0x60 [<c0393a00>] ? __cpufreq_set_policy+0x135/0x1bf [<c0141c28>] ? mark_held_locks+0x46/0x61 [<c0141d7d>] ? trace_hardirqs_on+0xb/0xd [<c0141d4a>] ? trace_hardirqs_on_caller+0xe9/0x111 [<c0141d7d>] ? trace_hardirqs_on+0xb/0xd [<c027fc1d>] ? acpi_processor_get_platform_limit+0x9f/0xac [<c027f285>] acpi_processor_cst_has_changed+0x64/0xc0 [<c027cadd>] acpi_cpu_soft_notify+0x2a/0x39 [<c041193c>] notifier_call_chain+0x32/0x64 [<c013b87f>] __raw_notifier_call_chain+0xe/0x10 [<c013b88d>] raw_notifier_call_chain+0xc/0xe [<c040cb33>] _cpu_up+0xb3/0xdc [<c040cb9e>] cpu_up+0x42/0x52 [<c03fab35>] store_online+0x39/0x5d [<c03faafc>] ? store_online+0x0/0x5d [<c02c1e6c>] sysdev_store+0x20/0x25 [<c01b2190>] flush_write_buffer+0x3e/0x53 [<c01b21e3>] sysfs_write_file+0x3e/0x5d [<c017e281>] vfs_write+0x8d/0x105 [<c017e394>] sys_write+0x3b/0x60 [<c0103931>] sysenter_past_esp+0x6a/0xa5 ======================= ---[ end trace 987615de2ae7cfa5 ]--- Which corresponds to /* Fall back to the default idle loop */ WARN_ON_ONCE(!pm_idle_save); if (pm_idle_save) pm_idle = pm_idle_save; synchronize_sched(); /* Relies on interrupts forcing exit from idle. */ -- regards, Dhaval ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2008-07-03 16:32 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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[not found] <20080702190651.GA13252@linux.vnet.ibm.com>
2008-07-02 20:55 ` [x86-tip] panic during cpu_up Dhaval Giani
2008-07-03 7:02 ` Ingo Molnar
2008-07-03 8:06 ` Dhaval Giani
2008-07-03 16:30 ` Dhaval Giani
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