Messages in this thread Patch in this message | | | Subject | Re: [2.6.25-rc5-mm1] BUG() at mnt_want_write(). | From | Tetsuo Handa <> | Date | Wed, 12 Mar 2008 15:35:38 +0900 |
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Hello.
I modified /usr/share/initrd-tools/init and tested.
----- start of patch ----- diff -u /usr/share/initrd-tools/init.org /usr/share/initrd-tools/init --- /usr/share/initrd-tools/init.org 2005-05-27 08:44:00.000000000 +0900 +++ /usr/share/initrd-tools/init 2008-03-12 15:14:31.000000000 +0900 @@ -359,7 +359,10 @@
read root < bin/root umount -n bin +echo "About to write real-root-dev" +echo "hello" > proc/version echo $root > proc/sys/kernel/real-root-dev +echo "Wrote real-root-dev"
get_cmdline
@@ -415,7 +418,9 @@
cd / mount -nt proc proc proc +echo "About to read real-root-dev" rootdev=$(cat proc/sys/kernel/real-root-dev) +echo "Read real-root-dev" cmdline=$(cat /proc/cmdline) umount -n proc if [ $rootdev != 256 ]; then ----- end of patch ----- The result was
----------------------------------------------------------------------------- initrd-tools: 0.1.81.1 do_sys_open: bin/root do_sys_open: /etc/ld.so.preload do_sys_open: /etc/ld.so.cache do_sys_open: /lib/tls/i686/mmx/cmov/libblkid.so.1 do_sys_open: /lib/tls/i686/mmx/libblkid.so.1 do_sys_open: /lib/tls/i686/cmov/libblkid.so.1 do_sys_open: /lib/tls/i686/libblkid.so.1 do_sys_open: /lib/tls/mmx/cmov/libblkid.so.1 do_sys_open: /lib/tls/mmx/libblkid.so.1 do_sys_open: /lib/tls/cmov/libblkid.so.1 do_sys_open: /lib/tls/libblkid.so.1 do_sys_open: /lib/i686/mmx/cmov/libblkid.so.1 do_sys_open: /lib/i686/mmx/libblkid.so.1 do_sys_open: /lib/i686/cmov/libblkid.so.1 do_sys_open: /lib/i686/libblkid.so.1 do_sys_open: /lib/mmx/cmov/libblkid.so.1 do_sys_open: /lib/mmx/libblkid.so.1 do_sys_open: /lib/cmov/libblkid.so.1 do_sys_open: /lib/libblkid.so.1 do_sys_open: /lib/tls/libuuid.so.1 do_sys_open: /lib/libuuid.so.1 do_sys_open: /lib/tls/libc.so.6 do_sys_open: /etc/mtab About to write real-root-dev do_sys_open: proc/version BUG: unable to handle kernel paging request at df366fe8 IP: [<c017e0d0>] mnt_want_write+0x41/0x5f *pde = 1f884163 *pte = 1f366160 Oops: 0002 [#1] SMP DEBUG_PAGEALLOC last sysfs file: Modules linked in: Pid: 1, comm: init Not tainted (2.6.25-rc5-mm1 #2) EIP: 0060:[<c017e0d0>] EFLAGS: 00010286 CPU: 0 EIP is at mnt_want_write+0x41/0x5f EAX: 00000000 EBX: c1453460 ECX: 00000001 EDX: df366f78 ESI: df363f78 EDI: 00000000 EBP: df8e1ef0 ESP: df8e1ee4 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 Process init (pid: 1, ti=df8e1000 task=df8f8020 task.ti=df8e1000) Stack: ffffffeb 00000200 df8e1f20 df8e1f7c c0173481 ffffa87b 00000000 ffffff9c c053481a 00008242 00000000 00000002 00008241 df363f78 df56cf50 df363f78 df56cf50 57b32ee9 00000007 df911005 00000300 00000000 00000000 c016a9ca Call Trace: [<c0173481>] ? do_filp_open+0x233/0x52f [<c016a9ca>] ? get_unused_fd_flags+0xb3/0xbe [<c016aabd>] ? do_sys_open+0x50/0xd0 [<c016ab53>] ? sys_open+0x16/0x18 [<c0103966>] ? syscall_call+0x7/0xb ======================= Code: 8d 1c 02 89 d8 e8 d3 b4 1c 00 89 f0 e8 7e ff ff ff 85 c0 74 07 bf e2 ff ff ff eb 1f 8b 53 2c 39 f2 74 15 85 d2 74 0e 8b 43 28 90 <01> 42 70 c7 43 28 00 00 00 00 89 73 2c ff 43 28 89 d8 e8 cf b5 EIP: [<c017e0d0>] mnt_want_write+0x41/0x5f SS:ESP 0068:df8e1ee4 ---[ end trace e13043ee7a72cd3f ]--- Kernel panic - not syncing: Attempted to kill init! ----------------------------------------------------------------------------- "proc/version" caused the same problem with "proc/sys/kernel/real-root-dev".
And if I specify "bin/foo" instead of "proc/version", the result was
----------------------------------------------------------------------------- About to write real-root-dev do_sys_open: bin/foo /sbin/init: 363: cannot create bin/foo: Read-only file system do_sys_open: proc/sys/kernel/real-root-dev BUG: unable to handle kernel paging request at df379fe8 ----------------------------------------------------------------------------- So, no problem with accessing "bin/", but has problem with "proc/".
Regards.
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