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Message-ID: <u2u4aa525de1004270454v4da1cb28ld5f2a3e54962f182@mail.gmail.com> Date: Tue, 27 Apr 2010 13:54:09 +0200 From: Paolo Minazzi <paolo.minazzi@...il.com> To: Jörn Engel <joern@...fs.org> Cc: Jens Axboe <jens.axboe@...cle.com>, Linus Torvalds <torvalds@...ux-foundation.org>, David Woodhouse <dwmw2@...radead.org>, linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org, Christoph Hellwig <hch@...radead.org> Subject: Re: [PATCH 2/2] [MTD] Call bdi_init() and bdi_register() Ok, now it is very better. My problem now is that logfs does not save files in the following case: 1) power-off, then power-on (without umount) 2) sync, then power-off, then power-on (without umount) Using umount sometimes seems works, sometimes I have the following oop : ~ # mount -t logfs /dev/mtdblock7 /mitrolbackup ~ # cd /mitrolbackup /mitrolbackup # echo ciao > ciao /mitrolbackup # echo pino > pino /mitrolbackup # ls ciao pino /mitrolbackup # cd .. ~ # umount /mitrolbackup/ kernel BUG at fs/logfs/readwrite.c:1976! Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = c7db0000 [00000000] *pgd=c7dac031, *pte=00000000, *ppte=00000000 Internal error: Oops: 817 [#1] last sysfs file: Modules linked in: CPU: 0 Not tainted (2.6.34-rc5 #19) PC is at __bug+0x20/0x2c LR is at release_console_sem+0x1b8/0x1ec pc : [<c003a1ac>] lr : [<c004760c>] psr: 60000013 sp : c7d5fe60 ip : c7d5fd98 fp : c7d5fe6c r10: 00000003 r9 : 00000000 r8 : c7d5feb4 r7 : 00000003 r6 : c7d5feb4 r5 : c7819878 r4 : c7819870 r3 : 00000000 r2 : 60000013 r1 : 000019c2 r0 : 0000002f Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: c000717f Table: c7db0000 DAC: 00000015 Process umount (pid: 307, stack limit = 0xc7d5e260) Stack: (0xc7d5fe60 to 0xc7d60000) fe60: c7d5fe7c c7d5fe70 c00fb2f0 c003a19c c7d5fe90 c7d5fe80 c00ad358 c00fb274 fe80: c7819870 c7d5feb0 c7d5fe94 c00ad3e4 c00ad2bc c7d46a64 c7d46a54 c7819880 fea0: c7d46a64 c7d5fee4 c7d5feb4 c00ad5a8 c00ad3d0 c7d5feb4 c7d5feb4 c7d46a00 fec0: c7d5e000 c022a324 00000000 c7d5ff54 c7d2b880 00000000 c7d5ff00 c7d5fee8 fee0: c009c8ec c00ad4c0 c7d46a00 c7c14000 c7d2b880 c7d5ff1c c7d5ff04 c00feb38 ff00: c009c84c c7d46a00 c02b7b84 c7d2b880 c7d5ff34 c7d5ff20 c009c740 c00feb00 ff20: c7d2b880 c7d46a00 c7d5ff4c c7d5ff38 c00b0bd0 c009c708 00000000 c7d2b898 ff40: c7d5ff94 c7d5ff50 c00b1e90 c00b0b7c 00000000 c7d5ff54 c7d5ff54 c7d5ff5c ff60: c7d5ff5c c7d2b880 c7817500 be8e3e0c 00000000 be8e5fb4 00000016 c00370a4 ff80: c7d5e000 be8e5eec c7d5ffa4 c7d5ff98 c00b2164 c00b1e34 00000000 c7d5ffa8 ffa0: c0036f00 c00b2160 be8e3e0c 00000000 be8e5fb4 be8e3e0c be8e3e1a 00000000 ffc0: be8e3e0c 00000000 be8e5fb4 00000000 00000000 00000000 be8e5eec 00000000 ffe0: 40099450 be8e3de4 0006779c 40099458 20000010 be8e5fb4 e0830007 e0833006 Backtrace: [<c003a18c>] (__bug+0x0/0x2c) from [<c00fb2f0>] (logfs_clear_inode+0x8c/0xb0) [<c00fb264>] (logfs_clear_inode+0x0/0xb0) from [<c00ad358>] (clear_inode+0xac/0x114) [<c00ad2ac>] (clear_inode+0x0/0x114) from [<c00ad3e4>] (dispose_list+0x24/0xf0) r4:c7819870 [<c00ad3c0>] (dispose_list+0x0/0xf0) from [<c00ad5a8>] (invalidate_inodes+0xf8/0x12c) r7:c7d46a64 r6:c7819880 r5:c7d46a54 r4:c7d46a64 [<c00ad4b0>] (invalidate_inodes+0x0/0x12c) from [<c009c8ec>] (generic_shutdown_super+0xb0/0x11c) [<c009c83c>] (generic_shutdown_super+0x0/0x11c) from [<c00feb38>] (logfs_kill_sb+0x48/0xfc) r6:c7d2b880 r5:c7c14000 r4:c7d46a00 [<c00feaf0>] (logfs_kill_sb+0x0/0xfc) from [<c009c740>] (deactivate_super+0x48/0x60) r6:c7d2b880 r5:c02b7b84 r4:c7d46a00 [<c009c6f8>] (deactivate_super+0x0/0x60) from [<c00b0bd0>] (mntput_no_expire+0x64/0xbc) r5:c7d46a00 r4:c7d2b880 [<c00b0b6c>] (mntput_no_expire+0x0/0xbc) from [<c00b1e90>] (sys_umount+0x6c/0x32c) r5:c7d2b898 r4:00000000 [<c00b1e24>] (sys_umount+0x0/0x32c) from [<c00b2164>] (sys_oldumount+0x14/0x18) [<c00b2150>] (sys_oldumount+0x0/0x18) from [<c0036f00>] (ret_fast_syscall+0x0/0x2c) Code: e1a01000 e59f000c eb003605 e3a03000 (e5833000) ---[ end trace 979e02c61e928049 ]--- ------------[ cut here ]------------ WARNING: at kernel/exit.c:907 do_exit+0x50c/0x628() Modules linked in: Backtrace: [<c003a3dc>] (dump_backtrace+0x0/0x12c) from [<c003a520>] (dump_stack+0x18/0x1c) r7:00000000 r6:c00493a4 r5:c02794cc r4:0000038b [<c003a508>] (dump_stack+0x0/0x1c) from [<c0046a38>] (warn_slowpath_common+0x4c/0x64) [<c00469ec>] (warn_slowpath_common+0x0/0x64) from [<c0046a68>] (warn_slowpath_null+0x18/0x1c) r7:c7d5fcdf r6:c7c8cc00 r5:00000000 r4:0000000b [<c0046a50>] (warn_slowpath_null+0x0/0x1c) from [<c00493a4>] (do_exit+0x50c/0x628) [<c0048e98>] (do_exit+0x0/0x628) from [<c003a7bc>] (die+0x27c/0x2b4) [<c003a540>] (die+0x0/0x2b4) from [<c003be7c>] (__do_kernel_fault+0x6c/0x8c) [<c003be10>] (__do_kernel_fault+0x0/0x8c) from [<c003c108>] (do_page_fault+0x198/0x1d8) r8:00000000 r7:00010000 r6:c7d341b4 r5:c7d34180 r4:c7d33d74 [<c003bf70>] (do_page_fault+0x0/0x1d8) from [<c0036210>] (do_DataAbort+0x40/0xa8) [<c00361d0>] (do_DataAbort+0x0/0xa8) from [<c0036a80>] (__dabt_svc+0x40/0x60) Exception stack(0xc7d5fe18 to 0xc7d5fe60) fe00: 0000002f 000019c2 fe20: 60000013 00000000 c7819870 c7819878 c7d5feb4 00000003 c7d5feb4 00000000 fe40: 00000003 c7d5fe6c c7d5fd98 c7d5fe60 c004760c c003a1ac 60000013 ffffffff r8:c7d5feb4 r7:00000003 r6:c7d5feb4 r5:c7d5fe4c r4:ffffffff [<c003a18c>] (__bug+0x0/0x2c) from [<c00fb2f0>] (logfs_clear_inode+0x8c/0xb0) [<c00fb264>] (logfs_clear_inode+0x0/0xb0) from [<c00ad358>] (clear_inode+0xac/0x114) [<c00ad2ac>] (clear_inode+0x0/0x114) from [<c00ad3e4>] (dispose_list+0x24/0xf0) r4:c7819870 [<c00ad3c0>] (dispose_list+0x0/0xf0) from [<c00ad5a8>] (invalidate_inodes+0xf8/0x12c) r7:c7d46a64 r6:c7819880 r5:c7d46a54 r4:c7d46a64 [<c00ad4b0>] (invalidate_inodes+0x0/0x12c) from [<c009c8ec>] (generic_shutdown_super+0xb0/0x11c) [<c009c83c>] (generic_shutdown_super+0x0/0x11c) from [<c00feb38>] (logfs_kill_sb+0x48/0xfc) r6:c7d2b880 r5:c7c14000 r4:c7d46a00 [<c00feaf0>] (logfs_kill_sb+0x0/0xfc) from [<c009c740>] (deactivate_super+0x48/0x60) r6:c7d2b880 r5:c02b7b84 r4:c7d46a00 [<c009c6f8>] (deactivate_super+0x0/0x60) from [<c00b0bd0>] (mntput_no_expire+0x64/0xbc) r5:c7d46a00 r4:c7d2b880 [<c00b0b6c>] (mntput_no_expire+0x0/0xbc) from [<c00b1e90>] (sys_umount+0x6c/0x32c) r5:c7d2b898 r4:00000000 [<c00b1e24>] (sys_umount+0x0/0x32c) from [<c00b2164>] (sys_oldumount+0x14/0x18) [<c00b2150>] (sys_oldumount+0x0/0x18) from [<c0036f00>] (ret_fast_syscall+0x0/0x2c) ---[ end trace 979e02c61e92804a ]--- Segmentation fault Today I have to work for money....probably I have no much time to test .... As soon as I can I'm happy to give my contribute to test. Paolo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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