aufs 20080707 /tmp is mounted as tmpfs Here goes couple very similar situations with very different results:
#### 1 #### [/]# mount -t aufs -o br:/tmp:/etc aufs /etc [42949437.380000] aufs test_add:367:mount[31]: uid/gid/perm /etc 500/500/0775, 0/0/0755 System just hangs at this point. #### 2 #### [/]# mount -t aufs -o br:/tmp/tmp_etc:/etc aufs /etc [42949415.830000] aufs test_add:367:mount[31]: uid/gid/perm /etc 500/500/0775, 0/0/0755 [/]# Everything works here as expected #### 3 #### [/]# mount -t aufs -o br:/tmp/etc:/etc aufs /etc [42949589.030000] aufs test_add:367:mount[47]: uid/gid/perm /etc 500/500/0775, 0/0/0755 [42949589.040000] Alignment trap: not handling swp instruction [42949589.050000] Alignment trap: not handling instruction e1002093 at [<c0187600>] [42949589.060000] Unhandled fault: alignment exception (0x803) at 0xc3d0ff16 [42949589.060000] Internal error: : 803 [#1] [42949589.060000] Modules linked in: cirrus [42949589.060000] CPU: 0 Not tainted (2.6.26-rc9 #4) [42949589.060000] PC is at mutex_lock+0x14/0x28 [42949589.060000] LR is at aufs_lookup+0x198/0x1ec [42949589.060000] pc : [<c0187604>] lr : [<c00d0004>] psr: 20000013 [42949589.060000] sp : c3d0dd10 ip : c3d0dd20 fp : c3d0dd1c [42949589.060000] r10: c3d0dee4 r9 : c3d0e9c0 r8 : c3d10c08 [42949589.060000] r7 : c3d1be70 r6 : 00000000 r5 : 00000001 r4 : c3d0ff16 [42949589.060000] r3 : 00000000 r2 : c3d0e1bc r1 : 01000000 r0 : c3d0ff16 [42949589.060000] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [42949589.060000] Control: 0000317f Table: 0bd14000 DAC: 00000015 [42949589.060000] Process sh (pid: 29, stack limit = 0xc3d0c260) [42949589.060000] Stack: (0xc3d0dd10 to 0xc3d0e000) [42949589.060000] dd00: c3d0dda8 c3d0dd20 c00d0004 c0187600 [42949589.060000] dd20: c3d0e9c0 c3d0ea3c 40040ee8 c3c000dc ffffff9c 00000101 00000001 00000000 [42949589.060000] dd40: 00000000 c3d0df24 c3d0df18 c0050264 c004fe54 c3d0df34 c3d0df28 c0063658 [42949589.060000] dd60: c0050260 00000001 00000000 c3d1be00 c3d0ddec c3d0dda8 c3d1bec8 c3d1be70 [42949589.060000] dd80: c0078520 c3d0dee4 c3d1be70 c3d0ea3c c3d0de00 c3d0ddec c3d10940 c3d0ddd8 [42949589.060000] dda0: c3d0ddac c006da1c c00cfe7c c3d109ac c3d0ddec c3cd900b 00000000 c3d0dee4 [42949589.060000] ddc0: 00000000 00000000 00000000 c3d0de30 c3d0dddc c006f26c c006d8ac c3d0c000 [42949589.060000] dde0: c3d0de20 00000101 c00630bc ceb0fa2e 00000006 c3cd9005 c028b360 00000070 [42949589.060000] de00: c3d0e9c0 c3d0ea3c c3d1bb80 c3d0dee4 c3cd9000 c3d0de34 00000003 00000000 [42949589.060000] de20: 00000000 c3d0de58 c3d0de34 c006f930 c006eae0 c3ca92a0 c3cc74d8 c3d1bb80 [42949589.060000] de40: c3d0dee4 c3cd9000 00000001 c3d0de80 c3d0de5c c006fb3c c006f8f0 ffffff9c [42949589.060000] de60: c3d0dee4 ffffff9c c3cd9000 00000001 00000003 c3d0dea0 c3d0de84 c007087c [42949589.060000] de80: c006fad8 00000000 00000001 00000004 00000000 c3d0debc c3d0dea4 c00708e8 [42949589.060000] dea0: c0070838 00000001 00000000 00000000 c3d0df6c c3d0dec0 c0070958 c00708d4 [42949589.060000] dec0: 00000001 c01f47a0 00000000 00000000 00000010 00000001 c028ab20 00000000 [42949589.060000] dee0: c3d0c000 c3d0e9c0 c3d0ea3c 40040ee8 c3c000dc ffffff9c 00000101 00000001 [42949589.060000] df00: 00000000 00000000 c3d0df24 c3d0df18 c0050264 c004fe54 c3d0df34 c3d0df28 [42949589.060000] df20: c0063658 c0050260 00000001 00000000 c3d1be00 c3d0c000 00000000 c3d0df6c [42949589.060000] df40: c3d0df4c 00000000 00000000 ffffff9c c3cd9000 00000003 c3d0c000 00000000 [42949589.060000] df60: c3d0df94 c3d0df70 c0063d98 c0070900 00005413 00000000 00000000 ffffffff [42949589.060000] df80: 00000005 c0018bc4 c3d0dfa4 c3d0df98 c0063e5c c0063d50 00000000 c3d0dfa8 [42949589.060000] dfa0: c0018a20 c0063e48 00000000 00000000 40040ee8 00000000 00000000 00000001 [42949589.060000] dfc0: 00000000 00000000 ffffffff 40040ee8 4004c080 0003c9b0 00000000 4004ae84 [42949589.060000] dfe0: 00000000 bef88938 4002a174 40017e14 60000010 40040ee8 00000000 00000000 [42949589.060000] Backtrace: [42949589.060000] [<c01875f0>] (mutex_lock+0x0/0x28) from [<c00d0004>] (aufs_lookup+0x198/0x1ec) [42949589.060000] [<c00cfe6c>] (aufs_lookup+0x0/0x1ec) from [<c006da1c>] (do_lookup+0x180/0x1bc) [42949589.060000] [<c006d89c>] (do_lookup+0x0/0x1bc) from [<c006f26c>] (__link_path_walk+0x79c/0xe10) [42949589.060000] [<c006ead0>] (__link_path_walk+0x0/0xe10) from [<c006f930>] (path_walk+0x50/0xa4) [42949589.060000] [<c006f8e0>] (path_walk+0x0/0xa4) from [<c006fb3c>] (do_path_lookup+0x74/0x168) [42949589.060000] r7:00000001 r6:c3cd9000 r5:c3d0dee4 r4:c3d1bb80 [42949589.060000] [<c006fac8>] (do_path_lookup+0x0/0x168) from [<c007087c>] (__path_lookup_intent_open+0x54/0x9c) [42949589.060000] r8:00000003 r7:00000001 r6:c3cd9000 r5:ffffff9c r4:c3d0dee4 [42949589.060000] [<c0070828>] (__path_lookup_intent_open+0x0/0x9c) from [<c00708e8>] (path_lookup_open+0x24/0x2c) [42949589.060000] r7:00000000 r6:00000004 r5:00000001 r4:00000000 [42949589.060000] [<c00708c4>] (path_lookup_open+0x0/0x2c) from [<c0070958>] (do_filp_open+0x68/0x784) [42949589.060000] r4:00000000 [42949589.060000] [<c00708f0>] (do_filp_open+0x0/0x784) from [<c0063d98>] (do_sys_open+0x58/0xe4) [42949589.060000] [<c0063d40>] (do_sys_open+0x0/0xe4) from [<c0063e5c>] (sys_open+0x24/0x28) [42949589.060000] r8:c0018bc4 r7:00000005 r6:ffffffff r5:00000000 r4:00000000 [42949589.060000] [<c0063e38>] (sys_open+0x0/0x28) from [<c0018a20>] (ret_fast_syscall+0x0/0x2c) [42949589.060000] Code: e92dd800 e24cb004 e3a03000 e1002093 (e3520001) [42949589.490000] ---[ end trace e4520229fccad28d ]--- process '-/bin/sh' (pid 29) exited. Scheduling for restart. starting pid 48, tty '': '-/bin/sh'
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