Hi. I have more details about the snapshot hang. Below you can find a kernel stack track. It seams that the two processes are in an dead-lock situation. The affected processes are: - dd (look for '[82038.781639] dd'); - lvcreate (look for '[82038.783758] lvcreate'). I guess following sitiation occoured because of an inconsistant locking between various kernel parts. Any idea / fix ;) / ... will be appreciated ;) The stack trace: ---- [82038.778744] mingetty S C1708040 2816 1112 1 1113 1110 (NOTLB) [82038.778808] f777ae94 00000082 f7a11560 c1708040 00000000 00000000 00001c26 001d4536 [82038.778858] 00000000 f7a11698 f7a11560 c1708040 98737eda 00000005 f777a000 00000000 [82038.778926] f777af20 986b184a 00000005 00000000 fffffff9 00000001 00000000 f63b8f60 [82038.778995] Call Trace: [82038.779022] [<c02e3015>] schedule_timeout+0x95/0xe0 [82038.779051] [<c0203afd>] read_chan+0x36d/0x6d0 [82038.779080] [<c01fe1e4>] tty_read+0x94/0xe0 [82038.779109] [<c0162e61>] vfs_read+0xc1/0x150 [82038.779136] [<c0163187>] sys_read+0x47/0x70 [82038.779165] [<c0102dcf>] sysenter_past_esp+0x54/0x75 [82038.779194] mingetty S C1708040 2840 1113 1 1934 1112 (NOTLB) [82038.779263] f7134e94 00000086 00000000 c1708040 c17089e0 00000000 0000b728 001fe826 [82038.779312] 00000000 f7e74158 f7e74020 c1708040 98c95abb 00000005 f7134000 00000000 [82038.779380] f7134f20 98c6728e 00000005 00000000 fffffff9 00000001 00000000 f72cc4c0 [82038.779447] Call Trace: [82038.779475] [<c02e3015>] schedule_timeout+0x95/0xe0 [82038.779507] [<c0203afd>] read_chan+0x36d/0x6d0 [82038.779536] [<c01fe1e4>] tty_read+0x94/0xe0 [82038.779563] [<c0162e61>] vfs_read+0xc1/0x150 [82038.779590] [<c0163187>] sys_read+0x47/0x70 [82038.779616] [<c0102dcf>] sysenter_past_esp+0x54/0x75 [82038.779643] kjournald S C1708040 2676 1934 1 2055 1113 (L-TLB) [82038.779707] f3fc4f80 00000046 00000000 c1708040 c17089e0 f733c080 00000373 000db43d [82038.779755] 00000000 f7b60158 f7b60020 c1708040 d93a215b 00004a91 f3fc4000 f7aabc64 [82038.779822] 00000003 d92d7d74 00004a91 f3fc4f80 c0133e1d 00000282 0000069a f7aabc00 [82038.779889] Call Trace: [82038.779917] [<c01b960e>] kjournald+0x22e/0x240 [82038.779947] [<c0100f99>] kernel_thread_helper+0x5/0xc [82038.779975] bash S C17104F4 2356 1975 1105 2058 (NOTLB) [82038.780037] f21d1f34 00000082 f7b80020 c17104f4 00004a9b 00000001 000051e1 0343e401 [82038.780089] 00000000 f707d158 f707d020 c1710040 87f4172b 00004a9b f21d1000 87f3e131 [82038.780153] 00004a9b 87ecc245 00004a9b f707d020 00000004 f21d1f34 f707d0dc 00000000 [82038.780216] Call Trace: [82038.780243] [<c0121820>] do_wait+0x280/0x3d0 [82038.780270] [<c0121a2e>] sys_wait4+0x3e/0x40 [82038.780298] [<c0121a55>] sys_waitpid+0x25/0x27 [82038.780328] [<c0102dcf>] sysenter_past_esp+0x54/0x75 [82038.780355] bash S C170807C 2620 2008 1107 2060 (NOTLB) [82038.780419] f0075f34 00000086 f74e8020 c170807c 00004a9c 00000001 00005be7 033bc7fa [82038.780470] 00000000 f7778698 f7778560 c1708040 650122b6 00004a9c f0075000 6500e5c2 [82038.780543] 00004a9c 64f960f9 00004a9c f7778560 00000004 f0075f34 f777861c 00000000 [82038.780611] Call Trace: [82038.780639] [<c0121820>] do_wait+0x280/0x3d0 [82038.780668] [<c0121a2e>] sys_wait4+0x3e/0x40 [82038.780696] [<c0121a55>] sys_waitpid+0x25/0x27 [82038.780724] [<c0102dcf>] sysenter_past_esp+0x54/0x75 [82038.780753] kjournald D C1708040 2640 2055 1 1934 (L-TLB) [82038.780817] f5a8ce9c 00000046 00000000 c1708040 c17089e0 f71d33bc 0000038a 00214f36 [82038.780870] 00000000 f76ce698 f76ce560 c1708040 b1df3d50 00004a9c f5a8c000 f5a8ce84 [82038.780937] c027a036 b1df106c 00004a9c f5a8ce98 c027c595 f76b1b00 c1708040 00000000 [82038.781003] Call Trace: [82038.781032] [<c02e2f08>] io_schedule+0x28/0x40 [82038.781060] [<c01641c1>] sync_buffer+0x41/0x50 [82038.781090] [<c02e3136>] __wait_on_bit+0x46/0x70 [82038.781119] [<c02e31cf>] out_of_line_wait_on_bit+0x6f/0x80 [82038.781148] [<c01b63f9>] journal_commit_transaction+0x4e9/0x1110 [82038.781179] [<c01b94d0>] kjournald+0xf0/0x240 [82038.781207] [<c0100f99>] kernel_thread_helper+0x5/0xc [82038.781235] bash S C1710040 2512 2058 1975 2059 (NOTLB) [82038.781303] f4195f34 00000082 00000001 c1710040 c17109e0 00000001 000026d5 0036985d [82038.781356] 00000000 f7b80158 f7b80020 c1710040 882baec3 00004a9b f4195000 00000000 [82038.781422] f4195f24 8829bf8f 00004a9b f7b80020 00000004 f4195f34 f7b800dc f7e74560 [82038.781494] Call Trace: [82038.781522] [<c0121820>] do_wait+0x280/0x3d0 [82038.781553] [<c0121a2e>] sys_wait4+0x3e/0x40 [82038.781582] [<c0121a55>] sys_waitpid+0x25/0x27 [82038.781611] [<c0102dcf>] sysenter_past_esp+0x54/0x75 [82038.781639] dd D C1708040 2840 2059 2058 (NOTLB) [82038.781705] f3ecfd68 00000086 00000000 c1708040 c17089e0 f3ecff50 000260db 00136672 [82038.781756] 00000000 f7e74698 f7e74560 c1708040 883b24cf 00004a9b f3ecf000 f3ecfd6c [82038.781823] 00000006 8838cd8e 00004a9b f3ecfd68 c0133e1d 00000282 f7aabe00 c1703f20 [82038.781891] Call Trace: [82038.781920] [<c01b3f62>] do_get_write_access+0x372/0x5c0 [82038.781949] [<c01b41de>] journal_get_write_access+0x2e/0x50 [82038.781980] [<c01a992b>] ext3_orphan_add+0xeb/0x250 [82038.782009] [<c01a6046>] ext3_setattr+0x1c6/0x240 [82038.782036] [<c017ffb6>] notify_change+0x246/0x2d5 [82038.782065] [<c0160f8c>] do_truncate+0x5c/0x80 [82038.783232] [<c01736d5>] may_open+0x1a5/0x220 [82038.783260] [<c01737eb>] open_namei+0x9b/0x6e0 [82038.783288] [<c016200a>] filp_open+0x3a/0x60 [82038.783314] [<c0162436>] sys_open+0x46/0x80 [82038.783342] [<c0102dcf>] sysenter_past_esp+0x54/0x75 [82038.783372] bash S C1708040 2372 2060 2008 2079 (NOTLB) [82038.783438] f4671f34 00000082 00000000 c1708040 c17089e0 00000001 000041c6 00f36a74 [82038.783492] 00000000 f74e8158 f74e8020 c1708040 78f829f2 00004a9c f4671000 00000000 [82038.783555] f4671f24 78e9a7fc 00004a9c f74e8020 00000004 f4671f34 f74e80dc f70c1560 [82038.783619] Call Trace: [82038.783646] [<c0121820>] do_wait+0x280/0x3d0 [82038.783676] [<c0121a2e>] sys_wait4+0x3e/0x40 [82038.783704] [<c0121a55>] sys_waitpid+0x25/0x27 [82038.783731] [<c0102dcf>] sysenter_past_esp+0x54/0x75 [82038.783758] lvcreate D C1708040 2480 2079 2060 (NOTLB) [82038.783822] efebce40 00000082 00000000 c1708040 c17089e0 00000000 00052162 0f5d4ed1 [82038.783872] 00000000 f70c1698 f70c1560 c1708040 a1232701 00004a9c efebc000 efebce4c [82038.783936] f70fb894 a1166816 00004a9c 00000000 00000286 0000013b f70fb854 f70fb85c [82038.784001] Call Trace: [82038.784029] [<c02e1cf5>] __down+0xd5/0x100 [82038.784058] [<c02e1e42>] __down_failed+0xa/0x10 [82038.784087] [<c0168128>] .text.lock.buffer+0x2e/0xa6 [82038.784118] [<c027aa35>] __lock_fs+0x55/0xd0 [82038.784151] [<c027ab9c>] dm_suspend+0x9c/0x240 [82038.784179] [<c027e399>] do_suspend+0xf9/0x1a0 [82038.784209] [<c027f98c>] ctl_ioctl+0xfc/0x150 [82038.784238] [<c0176edb>] do_ioctl+0x8b/0xa0 [82038.784265] [<c01770b0>] vfs_ioctl+0x60/0x210 [82038.784293] [<c01772da>] sys_ioctl+0x7a/0x90 [82038.784322] [<c0102dcf>] sysenter_past_esp+0x54/0x75 ---- Regards, Dezo
