Date: Fri, 9 Apr 2004 14:04:29 +0400 From: "Artem Koutchine" <matrix@itlegion.ru> To: <freebsd-current@freebsd.org> Subject: What does 'lock order reversal' mean? Message-ID: <01aa01c41e1a$0e916890$0c00a8c0@artem>
next in thread | raw e-mail | index | archive | help
When i run test perl scripts (6 processes in parallel) which crate a big array, manupulate it, free and over again so 2GB of ram is used up and system starts using swap i see the message below (only onces). What does it mean? Apr 7 20:16:34 new kernel: lock order reversal Apr 7 20:16:34 new kernel: 1st 0xc79446b4 vm object (vm object) @ /usr/src/sys/vm/swap_pager.c:1313 Apr 7 20:16:35 new kernel: 2nd 0xc08b9e00 swap_pager swhash (swap_pager swhash) @ /usr/src/sys/vm/swap_pager.c:1803 Apr 7 20:16:35 new kernel: 3rd 0xc7898294 vm object (vm object) @ /usr/src/sys/vm/uma_core.c:886 Apr 7 20:16:35 new kernel: Stack backtrace: Apr 7 20:16:35 new kernel: backtrace(0,1,c0888798,c08898f0,c08174bc) at backtrace+0x12 Apr 7 20:16:35 new kernel: witness_checkorder(c7898294,9,c07d43dd,376) at witness_checkorder+0x593 Apr 7 20:16:35 new kernel: _mtx_lock_flags(c7898294,0,c07d43dd,376,c78888d4) at _mtx_lock_flags+0x67 Apr 7 20:16:35 new kernel: obj_alloc(c78888c0,1000,e32ffa2f,101,c78888d4) at obj_alloc+0x31 Apr 7 20:16:35 new kernel: slab_zalloc(c78888c0,1,c78888c0,c78888d4,1) at slab_zalloc+0x82 Apr 7 20:16:35 new kernel: uma_zone_slab(c78888c0,1,c78888d4,0,c07d43dd,68f) at uma_zone_slab+0xb5 Apr 7 20:16:35 new kernel: uma_zalloc_internal(c78888c0,0,1,c78888d4,0) at uma_zalloc_internal+0x28 Apr 7 20:16:35 new kernel: uma_zalloc_arg(c78888c0,0,1) at uma_zalloc_arg+0x2f8 Apr 7 20:16:35 new kernel: swp_pager_meta_build(c79446b4,38,0,2,0) at swp_pager_meta_build+0x108 Apr 7 20:16:36 new kernel: swap_pager_putpages(c79446b4,e32ffc00,4,0,e32ffb70) at swap_pager_putpages+0x2b4 Apr 7 20:16:36 new kernel: default_pager_putpages(c79446b4,e32ffc00,4,0,e32ffb70) at default_pager_putpages+0x18 Apr 7 20:16:36 new kernel: vm_pageout_flush(e32ffc00,4,0,0,e32ffbdc) at vm_pageout_flush+0x11e Apr 7 20:16:36 new kernel: vm_pageout_clean(c2c26308) at vm_pageout_clean+0x2a5 Apr 7 20:16:36 new kernel: vm_pageout_scan(0) at vm_pageout_scan+0x54b Apr 7 20:16:36 new kernel: vm_pageout(0,e32ffd48,0,c071cc3c,0) at vm_pageout+0x2d2 Apr 7 20:16:36 new kernel: fork_exit(c071cc3c,0,e32ffd48) at fork_exit+0xa8 Apr 7 20:16:36 new kernel: fork_trampoline() at fork_trampoline+0x8 Apr 7 20:16:36 new kernel: --- trap 0x1, eip = 0, esp = 0xe32ffd7c, ebp = 0 ---
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?01aa01c41e1a$0e916890$0c00a8c0>