Re: OF-related boot crash in 3.3.0-rc3-00188-g3ec1e88

[Meelis Roos]

> Meelis, can you get your tree back into a state where the crash happens
> and then add the following debugging patch and see what happens?

Tried it, no obvious results in dmesg, except the crash is in a slightly 
different location.

[    0.000000] PROMLIB: Sun IEEE Boot Prom 'OBP 3.2.30 2002/10/25 14:03'
[    0.000000] PROMLIB: Root node compatible: 
[    0.000000] Linux version 3.2.0-rc3-00076-g7bd0b0f-dirty (mroos@korvits) (gcc version 4.6.2 (Debian 4.6.2-14) ) #84 SMP Tue Feb 28 23:28:49 EET 2012
[    0.000000] debug: ignoring loglevel setting.
[    0.000000] bootconsole [earlyprom0] enabled
[    0.000000] ARCH: SUN4U
[    0.000000] Ethernet address: 08:00:20:b6:ee:e2
[    0.000000] Kernel: Using 4 locked TLB entries for main kernel image.
[    0.000000] Remapping the kernel... done.
[    0.000000] Unable to handle kernel paging request at virtual address 000000007fcf2000
[    0.000000] tsk->{mm,active_mm}->context = 0000000000000000
[    0.000000] tsk->{mm,active_mm}->pgd = fffff800007db7d0
[    0.000000]               \|/ ____ \|/
[    0.000000]               "@'/ .. \`@"
[    0.000000]               /_| \__/ |_\
[    0.000000]                  \__U_/
[    0.000000] swapper(0): Oops [#1]
[    0.000000] TSTATE: 0000008880e01600 TPC: 000000000057b4c8 TNPC: 000000000057b4cc Y: 00000037    Not tainted
[    0.000000] TPC: <strcmp+0x8/0x60>
[    0.000000] g0: 000000000077f7f0 g1: 0000000000000000 g2: 000000000000002f g3: 00000000000000f0
[    0.000000] g4: 000000000077f350 g5: 0000000000000000 g6: 0000000000760000 g7: 0000000000000050
[    0.000000] o0: 000000000079dbc8 o1: 0000000000000000 o2: 0000000000000000 o3: 0000000000000002
[    0.000000] o4: 0000000000000002 o5: 0000000000000000 sp: 0000000000763181 ret_pc: 00000000006a9984
[    0.000000] RPC: <_raw_read_lock+0x24/0x40>
[    0.000000] l0: 0000000001028000 l1: fffff8007fcbc380 l2: 8000000000000000 l3: 0800000000000000
[    0.000000] l4: 0000000000000080 l5: 0000000000000002 l6: 0000000000000000 l7: 0020280000000000
[    0.000000] i0: 000000007fcf3c80 i1: fffff8007fcec480 i2: 0000000001010101 i3: 0000000080808080
[    0.000000] i4: fffff8007fcb8ccd i5: 0000000000028337 i6: 0000000000763231 i7: 0000000000606250
[    0.000000] I7: <of_find_node_by_path+0x30/0x80>
[    0.000000] Call Trace:
[    0.000000]  [0000000000606250] of_find_node_by_path+0x30/0x80
[    0.000000]  [0000000000606e0c] of_alias_scan+0xcc/0x1c0
[    0.000000]  [00000000007c328c] of_pdt_build_devicetree+0x90/0xa0
[    0.000000]  [00000000007b0680] prom_build_devicetree+0x10/0x3c
[    0.000000]  [00000000007b4614] paging_init+0x59c/0x6bc
[    0.000000]  [00000000007afffc] setup_arch+0xf8/0x110
[    0.000000]  [00000000007ae514] start_kernel+0x84/0x32c
[    0.000000]  [00000000006918c8] tlb_fixup_done+0xa0/0xa8
[    0.000000]  [0000000000000000]           (null)
[    0.000000] Disabling lock debugging due to kernel taint
[    0.000000] Caller[0000000000606250]: of_find_node_by_path+0x30/0x80
[    0.000000] Caller[0000000000606e0c]: of_alias_scan+0xcc/0x1c0
[    0.000000] Caller[00000000007c328c]: of_pdt_build_devicetree+0x90/0xa0
[    0.000000] Caller[00000000007b0680]: prom_build_devicetree+0x10/0x3c
[    0.000000] Caller[00000000007b4614]: paging_init+0x59c/0x6bc
[    0.000000] Caller[00000000007afffc]: setup_arch+0xf8/0x110
[    0.000000] Caller[00000000007ae514]: start_kernel+0x84/0x32c
[    0.000000] Caller[00000000006918c8]: tlb_fixup_done+0xa0/0xa8
[    0.000000] Caller[0000000000000000]:           (null)
[    0.000000] Instruction DUMP: 01000000  9de3bf50  82102000 <c40e0001> c60e4001  80a08003  12400008  82006001  80a0a000 
[    0.000000] Kernel panic - not syncing: Attempted to kill the idle task!
[    0.000000] Call Trace:
[    0.000000]  [000000000069c7fc] panic+0x68/0x1e4
[    0.000000]  [0000000000461a30] do_exit+0x230/0x2c0
[    0.000000]  [00000000004292c0] die_if_kernel+0x180/0x260
[    0.000000]  [000000000069c224] unhandled_fault+0x8c/0x98
[    0.000000]  [0000000000445778] do_kernel_fault+0xd8/0x100
[    0.000000]  [000000000044584c] do_sparc64_fault+0xac/0x540
[    0.000000]  [0000000000407948] sparc64_realfault_common+0x10/0x20
[    0.000000]  [000000000057b4c8] strcmp+0x8/0x60
[    0.000000]  [0000000000606250] of_find_node_by_path+0x30/0x80
[    0.000000]  [0000000000606e0c] of_alias_scan+0xcc/0x1c0
[    0.000000]  [00000000007c328c] of_pdt_build_devicetree+0x90/0xa0
[    0.000000]  [00000000007b0680] prom_build_devicetree+0x10/0x3c
[    0.000000]  [00000000007b4614] paging_init+0x59c/0x6bc
[    0.000000]  [00000000007afffc] setup_arch+0xf8/0x110
[    0.000000]  [00000000007ae514] start_kernel+0x84/0x32c
[    0.000000]  [00000000006918c8] tlb_fixup_done+0xa0/0xa8
[    0.000000] Press Stop-A (L1-A) to return to the boot prom

-- 
Meelis Roos (mroos@xxxxxxxx)
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