Well, fuzzying an UML (32 bit Gentoo Linux) system with SLUB for current git kernel 3.9-rc5-x gives for the mentioned 4 syscalls very quickly a warning like the seen below.
What I (as usual) do not know, is, if these warnings are UML architecture specific or if I should Cc: the LKML ? 2013-04-02T21:44:05.800+02:00 trinity kernel: ------------[ cut here ]------------ 2013-04-02T21:44:05.800+02:00 trinity kernel: WARNING: at mm/page_alloc.c:2386 __alloc_pages_nodemask+0x153/0x750() 2013-04-02T21:44:05.800+02:00 trinity kernel: 405dfd14: [<0836f888>] dump_stack+0x22/0x24 2013-04-02T21:44:05.800+02:00 trinity kernel: 405dfd2c: [<0807f14a>] warn_slowpath_common+0x5a/0x80 2013-04-02T21:44:05.800+02:00 trinity kernel: 405dfd54: [<0807f213>] warn_slowpath_null+0x23/0x30 2013-04-02T21:44:05.800+02:00 trinity kernel: 405dfd64: [<080d03a3>] __alloc_pages_nodemask+0x153/0x750 2013-04-02T21:44:05.800+02:00 trinity kernel: 405dfdf0: [<080d09c8>] __get_free_pages+0x28/0x50 2013-04-02T21:44:05.800+02:00 trinity kernel: 405dfe08: [<080f9e0f>] __kmalloc_track_caller+0x3f/0x180 2013-04-02T21:44:05.800+02:00 trinity kernel: 405dfe30: [<080dbee6>] memdup_user+0x26/0x70 2013-04-02T21:44:05.800+02:00 trinity kernel: 405dfe4c: [<080dc0ee>] strndup_user+0x3e/0x60 2013-04-02T21:44:05.801+02:00 trinity kernel: 405dfe68: [<081190f0>] copy_mount_string+0x30/0x50 2013-04-02T21:44:05.801+02:00 trinity kernel: 405dfe7c: [<08119af2>] sys_mount+0x52/0xe0 2013-04-02T21:44:05.801+02:00 trinity kernel: 405dfeac: [<08064a92>] handle_syscall+0x82/0xb0 2013-04-02T21:44:05.801+02:00 trinity kernel: 405dfef4: [<08076edd>] userspace+0x46d/0x590 2013-04-02T21:44:05.801+02:00 trinity kernel: 405dffec: [<080617cc>] fork_handler+0x6c/0x70 2013-04-02T21:44:05.801+02:00 trinity kernel: 405dfffc: [<5a5a5a5a>] 0x5a5a5a5a 2013-04-02T21:44:05.801+02:00 trinity kernel: 2013-04-02T21:44:05.801+02:00 trinity kernel: ---[ end trace c1c5349b53f54f0a ]--- or 2013-04-02T21:47:23.646+02:00 trinity kernel: ------------[ cut here ]------------ 2013-04-02T21:47:23.646+02:00 trinity kernel: WARNING: at mm/page_alloc.c:2386 __alloc_pages_nodemask+0x153/0x750() 2013-04-02T21:47:23.646+02:00 trinity kernel: 40167d1c: [<0836f888>] dump_stack+0x22/0x24 2013-04-02T21:47:23.646+02:00 trinity kernel: 40167d34: [<0807f14a>] warn_slowpath_common+0x5a/0x80 2013-04-02T21:47:23.646+02:00 trinity kernel: 40167d5c: [<0807f213>] warn_slowpath_null+0x23/0x30 2013-04-02T21:47:23.646+02:00 trinity kernel: 40167d6c: [<080d03a3>] __alloc_pages_nodemask+0x153/0x750 2013-04-02T21:47:23.646+02:00 trinity kernel: 40167df8: [<080d09c8>] __get_free_pages+0x28/0x50 2013-04-02T21:47:23.646+02:00 trinity kernel: 40167e10: [<080f9e0f>] __kmalloc_track_caller+0x3f/0x180 2013-04-02T21:47:23.646+02:00 trinity kernel: 40167e38: [<080dbee6>] memdup_user+0x26/0x70 2013-04-02T21:47:23.646+02:00 trinity kernel: 40167e54: [<080dc0ee>] strndup_user+0x3e/0x60 2013-04-02T21:47:23.655+02:00 trinity kernel: 40167e70: [<0823ba63>] keyctl_join_session_keyring+0x23/0x60 2013-04-02T21:47:23.655+02:00 trinity kernel: 40167e88: [<0823ce48>] sys_keyctl+0x58/0x240 2013-04-02T21:47:23.655+02:00 trinity kernel: 40167eac: [<08064a92>] handle_syscall+0x82/0xb0 2013-04-02T21:47:23.655+02:00 trinity kernel: 40167ef4: [<08076edd>] userspace+0x46d/0x590 2013-04-02T21:47:23.655+02:00 trinity kernel: 40167fec: [<080617cc>] fork_handler+0x6c/0x70 2013-04-02T21:47:23.655+02:00 trinity kernel: 40167ffc: [<00000000>] 0x0 2013-04-02T21:47:23.655+02:00 trinity kernel: 2013-04-02T21:47:23.655+02:00 trinity kernel: ---[ end trace e5cc052314f8b4fd ]--- 2013-04-02T21:49:34.162+02:00 trinity kernel: ------------[ cut here ]------------ 2013-04-02T21:49:34.162+02:00 trinity kernel: WARNING: at mm/page_alloc.c:2386 __alloc_pages_nodemask+0x153/0x750() 2013-04-02T21:49:34.162+02:00 trinity kernel: 40197cfc: [<0836f888>] dump_stack+0x22/0x24 2013-04-02T21:49:34.162+02:00 trinity kernel: 40197d14: [<0807f14a>] warn_slowpath_common+0x5a/0x80 2013-04-02T21:49:34.162+02:00 trinity kernel: 40197d3c: [<0807f213>] warn_slowpath_null+0x23/0x30 2013-04-02T21:49:34.162+02:00 trinity kernel: 40197d4c: [<080d03a3>] __alloc_pages_nodemask+0x153/0x750 2013-04-02T21:49:34.162+02:00 trinity kernel: 40197dd8: [<080d09c8>] __get_free_pages+0x28/0x50 2013-04-02T21:49:34.162+02:00 trinity kernel: 40197df0: [<080f9e0f>] __kmalloc_track_caller+0x3f/0x180 2013-04-02T21:49:34.162+02:00 trinity kernel: 40197e18: [<080dbee6>] memdup_user+0x26/0x70 2013-04-02T21:49:34.162+02:00 trinity kernel: 40197e34: [<080dc0ee>] strndup_user+0x3e/0x60 2013-04-02T21:49:34.163+02:00 trinity kernel: 40197e50: [<0823b709>] sys_add_key+0x49/0x1c0 2013-04-02T21:49:34.163+02:00 trinity kernel: 40197eac: [<08064a92>] handle_syscall+0x82/0xb0 2013-04-02T21:49:34.163+02:00 trinity kernel: 40197ef4: [<08076edd>] userspace+0x46d/0x590 2013-04-02T21:49:34.163+02:00 trinity kernel: 40197fec: [<080617cc>] fork_handler+0x6c/0x70 2013-04-02T21:49:34.163+02:00 trinity kernel: 40197ffc: [<00000000>] 0x0 2013-04-02T21:49:34.163+02:00 trinity kernel: 2013-04-02T21:49:34.163+02:00 trinity kernel: ---[ end trace 04c0afacb31314cf ]--- respectively. -- MfG/Sincerely Toralf Förster pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3 ------------------------------------------------------------------------------ Minimize network downtime and maximize team effectiveness. 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