Re: kernel BUG at kernel/sched/core.c:2702!

[Meelis Roos]

> > I am seeing this BUG on 3 different sparc64 machines with yesterdays 
> > git. sparc64-specific known problems were just fixed before, 
> > 3.17.0-07551-g052db7e + slab alignment fix patch + sparc64 SIGBUS fix 
> > patch is working stable for me, whereas 3.17.0-09670-g0429fbc + SIGBUS 
> > patch fails on 3 machines (all I tried). Will try bisecting later if I 
> > get time.
> 
> Dave Miller identified it as a sparc64-specific problem with 
> CONFIG_SCHED_STACK_END_CHECK in another thread and his fix is working 
> for me.

The fix commit was 
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e2653143d7d79a49f1a961aeae1d82612838b12c 
for sparc64 (for background).

Now I hit the same problem on ia64 (rx2620) with 3.18-rc1 and 
CONFIG_SCHED_STACK_END_CHECK enabled:

[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x01000000-0x3e873fff]
[    0.000000]   node   0: [mem 0x3eb90000-0x3ee77fff]
[    0.000000]   node   0: [mem 0x3fc00000-0x3fe27fff]
[    0.000000]   node   0: [mem 0x100000000-0x5ffffbfff]
[    0.000000]   node   0: [mem 0x4040000000-0x40feffbfff]
[    0.000000]   node   0: [mem 0x40ff000000-0x40ffc2ffff]
[    0.000000]   node   0: [mem 0x40ffc9c000-0x40ffe03fff]
[    0.000000]   node   0: [mem 0x40ffe80000-0x40fffe3fff]
[    0.000000] Initmem setup node 0 [mem 0x01000000-0x40fffe3fff]
[    0.000000] Built 1 zonelists in Node order, mobility grouping on.  Total pages: 1565221
[    0.000000] Policy zone: Normal
[    0.000000] Kernel command line: BOOT_IMAGE=scsi0:/EFI/gentoo/boot/vmlinuz root=/dev/sda3  ro
[    0.000000] PID hash table entries: 4096 (order: 1, 32768 bytes)
[    0.000000] Sorting __ex_table...
[    0.000000] Memory: 25028864K/25129440K available (8621K kernel code, 528K rwdata, 932K rodata, 656K init, 286K bss, 100576K reserved)
[    0.000000] SLUB: HWalign=128, Order=0-3, MinObjects=0, CPUs=2, Nodes=8
[    0.000000] Hierarchical RCU implementation.
[    0.000000]  RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=2.
[    0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
[    0.000000] NR_IRQS:384
[    0.000000] ACPI: Local APIC address c0000000fee00000
[    0.000000] GSI 36 (level, low) -> CPU 0 (0x0000) vector 48
[    0.000000] Console: colour VGA+ 80x25
[    0.008000] Calibrating delay loop... 2390.01 BogoMIPS (lpj=4780032)
[    0.016088] pid_max: default: 32768 minimum: 301
[    0.016225] ACPI: Core revision 20140828
[    0.020263] ACPI: All ACPI Tables successfully acquired
[    0.021734] Dentry cache hash table entries: 4194304 (order: 11, 33554432 bytes)
[    0.050128] Inode-cache hash table entries: 2097152 (order: 10, 16777216 bytes)
[    0.062884] Mount-cache hash table entries: 65536 (order: 5, 524288 bytes)
[    0.063092] Mountpoint-cache hash table entries: 65536 (order: 5, 524288 bytes)
[    0.064677] kernel BUG at kernel/sched/core.c:2702!
[    0.064811] swapper/0[0]: bugcheck! 0 [1]
[    0.068000] Modules linked in:
[    0.068000] 
[    0.068000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.18.0-rc1 #13
[    0.068000] task: a000000100b40000 ti: a000000100b40cb0 task.ti: a000000100b40cb0
[    0.068000] psr : 00001010084a6010 ifs : 80000000000015ae ip  : [<a0000001008624e0>]    Not tainted (3.18.0-rc1)
[    0.068000] ip is at __schedule+0x1100/0x1520
[    0.068000] unat: 0000000000000000 pfs : 00000000000015ae rsc : 0000000000000003
[    0.068000] rnat: e000000001200880 bsps: a000000100b40000 pr  : 80000000ff509669
[    0.068000] ldrs: 0000000000000000 ccv : 0000000003dad2c2 fpsr: 0009804c8a70433f
[    0.068000] csd : 0000000000000000 ssd : 0000000000000000
[    0.068000] b0  : a0000001008624e0 b6  : a000000100a50350 b7  : a00000010049ff00
[    0.068000] f6  : 000000000000000000000 f7  : 1003e0044b82fa09b5a53
[    0.068000] f8  : 1003e0000000000000084 f9  : 1003e00000000007b5ccd
[    0.068000] f10 : 1003e20c49ba5e353f7cf f11 : 1003e00000000000fca57
[    0.068000] r1  : a000000100dab340 r2  : a000000100b934d8 r3  : a000000100b934e0
[    0.068000] r8  : 0000000000000027 r9  : 00000000000004d8 r10 : 000000000000fffe
[    0.068000] r11 : 00000000000004d6 r12 : a000000100b47e20 r13 : a000000100b40000
[    0.068000] r14 : a000000100babbc0 r15 : a000000100b934e0 r16 : 000000000000026b
[    0.068000] r17 : 0000000000007fff r18 : a000000100b83ca8 r19 : 000000000000000f
[    0.068000] r20 : 000000000000000f r21 : 0000000000000004 r22 : 0000000000000004
[    0.068000] r23 : 0000000000000000 r24 : a000000100a10588 r25 : 0000000000000000
[    0.068000] r26 : 0000000000000000 r27 : a000000100b69a28 r28 : a000000100b83b30
[    0.068000] r29 : 0000000000000005 r30 : c0000000f4050000 r31 : a000000100b83b30
[    0.068000] 
[    0.068000] Call Trace:
[    0.068000]  [<a000000100013090>] show_stack+0x90/0xc0
[    0.068000]                                 sp=a000000100b47a00 bsp=a000000100b41198
[    0.068000] Disabling lock debugging due to kernel taint
[    0.184005] Kernel panic - not syncing: Attempted to kill the idle task!

-- 
Meelis Roos (mroos@xxxxxxxx)
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