Although it just happens for the first time I'd like to share this.
Got by fuzzyinga 32bit stable Gentoo guest with trinity,
guest kernel is linux-v3.10-rc1-36 (strnlen + stub4 patch included) :
2013-05-14T18:06:15.405+02:00 trinity kernel:
=============================================================================
2013-05-14T18:06:15.405+02:00 trinity kernel: BUG anon_vma (Not tainted):
Redzone overwritten
2013-05-14T18:06:15.405+02:00 trinity kernel:
-----------------------------------------------------------------------------
2013-05-14T18:06:15.405+02:00 trinity kernel:
2013-05-14T18:06:15.405+02:00 trinity kernel: Disabling lock debugging due to
kernel taint
2013-05-14T18:06:15.405+02:00 trinity kernel: INFO: 0x405084f8-0x405084fb.
First byte 0xe8 instead of 0xcc
2013-05-14T18:06:15.405+02:00 trinity kernel: INFO: Allocated in
anon_vma_prepare+0x6a/0x160 age=1631 cpu=0 pid=856
2013-05-14T18:06:15.405+02:00 trinity kernel: INFO: Freed in
__put_anon_vma+0x93/0xa0 age=1651 cpu=0 pid=854
2013-05-14T18:06:15.405+02:00 trinity kernel: INFO: Slab 0x0ae47800 objects=46
used=7 fp=0x40508108 flags=0x0081
2013-05-14T18:06:15.405+02:00 trinity kernel: INFO: Object 0x405084d0
@offset=1232 fp=0x405084e8
2013-05-14T18:06:15.410+02:00 trinity kernel:
2013-05-14T18:06:15.410+02:00 trinity kernel: Bytes b4 405084c0: 59 03 00 00 00
99 ff ff 5a 5a 5a 5a 5a 5a 5a 5a Y.......ZZZZZZZZ
2013-05-14T18:06:15.410+02:00 trinity kernel: Object 405084d0: d0 84 50 40 00
00 00 00 01 00 00 00 ad 4e ad de ..P@.........N..
2013-05-14T18:06:15.410+02:00 trinity kernel: Object 405084e0: ff ff ff ff ff
ff ff ff e8 84 50 40 e8 84 50 40 ..........P@..P@
2013-05-14T18:06:15.410+02:00 trinity kernel: Object 405084f0: 00 00 00 00 00
00 00 00 ........
2013-05-14T18:06:15.410+02:00 trinity kernel: Redzone 405084f8: e8 84 50 40
..P@
2013-05-14T18:06:15.410+02:00 trinity kernel: Padding 40508520: 5a 5a 5a 5a 5a
5a 5a 5a ZZZZZZZZ
2013-05-14T18:06:15.410+02:00 trinity kernel: CPU: 0 PID: 856 Comm: rc Tainted:
G B 3.10.0-rc1-00036-g05d129d #9
2013-05-14T18:06:15.410+02:00 trinity kernel: 416a7c1c 416a7c48 080f9da0
083db92c 405084d0 000004d0 405084e8 0ae47800
2013-05-14T18:06:15.410+02:00 trinity kernel: 405084f8 00000004 405084fb
416a7c80 080fa378 083dba0c 405084f8 405084fb
2013-05-14T18:06:15.411+02:00 trinity kernel: 000000e8 000000cc 0000005a
405084d0 0ae47800 414496c0 414496c0 405084d0 416a7bf0: [<08060cff>]
show_stack+0xcf/0x100
2013-05-14T18:06:15.411+02:00 trinity kernel: 416a7c14: [<0835ed79>]
dump_stack+0x26/0x28
2013-05-14T18:06:15.411+02:00 trinity kernel: 416a7c24: [<080f9da0>]
print_trailer+0xe0/0xf0
2013-05-14T18:06:15.411+02:00 trinity kernel: 416a7c4c: [<080fa378>]
check_bytes_and_report+0xa8/0x100
2013-05-14T18:06:15.411+02:00 trinity kernel: 416a7c84: [<080fa41f>]
check_object+0x4f/0x210
2013-05-14T18:06:15.411+02:00 trinity kernel: 416a7cc0: [<0835d4c9>]
free_debug_processing+0xd0/0x216
2013-05-14T18:06:15.411+02:00 trinity kernel: 416a7cec: [<0835d6fd>]
__slab_free+0x2d/0x282
2013-05-14T18:06:15.411+02:00 trinity kernel: 416a7d50: [<080fba79>]
kmem_cache_free+0xe9/0x100
2013-05-14T18:06:15.411+02:00 trinity kernel: 416a7d74: [<080ee373>]
__put_anon_vma+0x93/0xa0
2013-05-14T18:06:15.411+02:00 trinity kernel: 416a7d8c: [<080ee61c>]
unlink_anon_vmas+0x13c/0x1a0
2013-05-14T18:06:15.413+02:00 trinity kernel: 416a7db4: [<080e4355>]
free_pgtables+0x55/0xe0
2013-05-14T18:06:15.413+02:00 trinity kernel: 416a7ddc: [<080eb84e>]
exit_mmap+0xbe/0x170
2013-05-14T18:06:15.413+02:00 trinity kernel: 416a7e14: [<0807991d>]
mmput+0x3d/0xb0
2013-05-14T18:06:15.413+02:00 trinity kernel: 416a7e28: [<08081086>]
do_exit+0x2f6/0x880
2013-05-14T18:06:15.413+02:00 trinity kernel: 416a7e78: [<080816f9>]
do_group_exit+0xa9/0xf0
2013-05-14T18:06:15.413+02:00 trinity kernel: 416a7ea0: [<08081759>]
SyS_exit_group+0x19/0x20
2013-05-14T18:06:15.413+02:00 trinity kernel: 416a7eac: [<08062ac2>]
handle_syscall+0x82/0xb0
2013-05-14T18:06:15.413+02:00 trinity kernel: 416a7ef4: [<0807519d>]
userspace+0x46d/0x590
2013-05-14T18:06:15.413+02:00 trinity kernel: 416a7fec: [<0805f7fc>]
fork_handler+0x6c/0x70
2013-05-14T18:06:15.413+02:00 trinity kernel: 416a7ffc: [<00000000>] 0x0
2013-05-14T18:06:15.414+02:00 trinity kernel:
2013-05-14T18:06:15.414+02:00 trinity kernel: FIX anon_vma: Restoring
0x405084f8-0x405084fb=0xcc
2013-05-14T18:06:15.414+02:00 trinity kernel:
2013-05-14T18:06:22.639+02:00 trinity kernel: INFO: 0x405084f8-0x405084fb.
First byte 0xcc instead of 0xbb
2013-05-14T18:06:22.639+02:00 trinity kernel: INFO: Allocated in
anon_vma_prepare+0x6a/0x160 age=2360 cpu=0 pid=856
2013-05-14T18:06:22.639+02:00 trinity kernel: INFO: Freed in
__put_anon_vma+0x93/0xa0 age=2380 cpu=0 pid=854
2013-05-14T18:06:22.639+02:00 trinity kernel: INFO: Slab 0x0ae47800 objects=46
used=46 fp=0x (null) flags=0x0080
2013-05-14T18:06:22.639+02:00 trinity kernel: INFO: Object 0x405084d0
@offset=1232 fp=0x40508108
2013-05-14T18:06:22.639+02:00 trinity kernel:
2013-05-14T18:06:22.644+02:00 trinity kernel: Bytes b4 405084c0: 59 03 00 00 00
99 ff ff 5a 5a 5a 5a 5a 5a 5a 5a Y.......ZZZZZZZZ
2013-05-14T18:06:22.644+02:00 trinity kernel: Object 405084d0: d0 84 50 40 00
00 00 00 01 00 00 00 ad 4e ad de ..P@.........N..
2013-05-14T18:06:22.644+02:00 trinity kernel: Object 405084e0: ff ff ff ff ff
ff ff ff e8 84 50 40 e8 84 50 40 ..........P@..P@
2013-05-14T18:06:22.644+02:00 trinity kernel: Object 405084f0: 00 00 00 00 00
00 00 00 ........
2013-05-14T18:06:22.644+02:00 trinity kernel: Redzone 405084f8: cc cc cc cc
....
2013-05-14T18:06:22.644+02:00 trinity kernel: Padding 40508520: 5a 5a 5a 5a 5a
5a 5a 5a ZZZZZZZZ
2013-05-14T18:06:22.644+02:00 trinity kernel: CPU: 0 PID: 964 Comm: sshd
Tainted: G B 3.10.0-rc1-00036-g05d129d #9
2013-05-14T18:06:22.644+02:00 trinity kernel: 41837c0c 41837c38 080f9da0
083db92c 405084d0 000004d0 40508108 0ae47800
2013-05-14T18:06:22.644+02:00 trinity kernel: 405084f8 00000004 405084fb
41837c70 080fa378 083dba0c 405084f8 405084fb
2013-05-14T18:06:22.644+02:00 trinity kernel: 000000cc 000000bb 0000005a
405084d0 0ae47800 414496c0 414496c0 405084d0 41837be0: [<08060cff>]
show_stack+0xcf/0x100
2013-05-14T18:06:22.653+02:00 trinity kernel: 41837c04: [<0835ed79>]
dump_stack+0x26/0x28
2013-05-14T18:06:22.653+02:00 trinity kernel: 41837c14: [<080f9da0>]
print_trailer+0xe0/0xf0
2013-05-14T18:06:22.653+02:00 trinity kernel: 41837c3c: [<080fa378>]
check_bytes_and_report+0xa8/0x100
2013-05-14T18:06:22.653+02:00 trinity kernel: 41837c74: [<080fa41f>]
check_object+0x4f/0x210
2013-05-14T18:06:22.653+02:00 trinity kernel: 41837cb0: [<0835d368>]
alloc_debug_processing+0x7d/0x10e
2013-05-14T18:06:22.653+02:00 trinity kernel: 41837cd4: [<0835ddd9>]
__slab_alloc.constprop.66+0x3ca/0x41c
2013-05-14T18:06:22.653+02:00 trinity kernel: 41837d68: [<080fb833>]
kmem_cache_alloc+0x33/0xf0
2013-05-14T18:06:22.653+02:00 trinity kernel: 41837d94: [<080ee85a>]
anon_vma_fork+0x4a/0x110
2013-05-14T18:06:22.653+02:00 trinity kernel: 41837db4: [<08079e61>]
dup_mm+0x261/0x490
2013-05-14T18:06:22.653+02:00 trinity kernel: 41837e04: [<0807aa7a>]
copy_process+0x9aa/0x11c0
2013-05-14T18:06:22.658+02:00 trinity kernel: 41837e4c: [<0807b375>]
do_fork+0x95/0x250
2013-05-14T18:06:22.658+02:00 trinity kernel: 41837e90: [<0807b61e>]
SyS_clone+0x2e/0x30
2013-05-14T18:06:22.658+02:00 trinity kernel: 41837eac: [<08062ac2>]
handle_syscall+0x82/0xb0
2013-05-14T18:06:22.658+02:00 trinity kernel: 41837ef4: [<0807519d>]
userspace+0x46d/0x590
2013-05-14T18:06:22.658+02:00 trinity kernel: 41837fec: [<0805f7fc>]
fork_handler+0x6c/0x70
2013-05-14T18:06:22.658+02:00 trinity kernel: 41837ffc: [<00000000>] 0x0
2013-05-14T18:06:22.658+02:00 trinity kernel:
2013-05-14T18:06:22.658+02:00 trinity kernel: FIX anon_vma: Restoring
0x405084f8-0x405084fb=0xbb
2013-05-14T18:06:22.658+02:00 trinity kernel:
2013-05-14T18:06:22.658+02:00 trinity kernel: FIX anon_vma: Marking all objects
used
--
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
------------------------------------------------------------------------------
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