THP bug and crash on sparc64 3.8

From: Meelis Roos
Date: Tue Feb 19 2013 - 06:57:15 EST


I am receiving this with 3.8.0 on Sun E420R (4G RAM, 4 CPUs). System
hangs after logging this to syslog. It was busy running ap at the
moment of crash.

CONFIG_TRANSPARENT_HUGEPAGE=y
CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y
# CONFIG_TRANSPARENT_HUGEPAGE_MADVISE is not set

BUG: sleeping function called from invalid context at mm/slub.c:925
in_atomic(): 1, irqs_disabled(): 0, pid: 327, name: khugepaged
2 locks held by khugepaged/327:
#0: (&mm->mmap_sem){++++++}, at: [<0000000000516964>]
khugepaged+0x624/0xf80
#1: (&(&mm->page_table_lock)->rlock){+.+.+.}, at: [<0000000000517078>]
khugepaged+0xd38/0xf

Call Trace:
[0000000000488d9c] __might_sleep+0x13c/0x240
[000000000051204c] kmem_cache_alloc+0xcc/0x120
[000000000044bfc0] tsb_grow+0x80/0x480
[000000000044e814] hugetlb_setup+0x14/0xc0
[000000000044bcb0] set_pmd_at+0x110/0x120
[00000000005170b8] khugepaged+0xd78/0xf80
[000000000047e508] kthread+0x88/0xa0
[00000000004060a4] ret_from_syscall+0x1c/0x2c
[0000000000000000] (null)

--
Meelis Roos (mroos@xxxxxxxx)
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