From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.nokia.com ([192.100.105.134] helo=mgw-mx09.nokia.com) by bombadil.infradead.org with esmtps (Exim 4.69 #1 (Red Hat Linux)) id 1OBNiE-0003XA-1x for linux-mtd@lists.infradead.org; Mon, 10 May 2010 07:47:39 +0000 Message-ID: <4BE7B9EE.8040806@nokia.com> Date: Mon, 10 May 2010 10:46:54 +0300 From: Adrian Hunter MIME-Version: 1.0 To: Daniel Mack Subject: Re: UBIFS: Oops while rebooting 2.6.34-rc6 References: <20100507131652.GT30801@buzzloop.caiaq.de> In-Reply-To: <20100507131652.GT30801@buzzloop.caiaq.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Sven Neumann , "linux-mtd@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Artem Bityutskiy List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Daniel Mack wrote: > Hi, > > We've had a kernel Oops today when rebooting an ARM PXA based machine > while file I/O via SSH was outstanding. It could be that VFS un-mounting has been broken. For example, it looks like perhaps writeback is being run by bdi_destroy after the file system has been unmounted? > > Daniel > > # reboot > # [ 671.190085] UBIFS: un-mount UBI device 0, volume 1 > The system is going down NOW! > Sent SIGTERM to all processes > [ 672.083833] Unable to handle kernel NULL pointer dereference at virtual address 000000ac > [ 672.094587] pgd = c0004000 > [ 672.097301] [000000ac] *pgd=00000000 > [ 672.100850] Internal error: Oops: 817 [#1] > [ 672.104919] last sysfs file: /sys/devices/platform/spi_gpio.0/spi0.2/value > [ 672.111741] Modules linked in: eeti_ts libertas_sdio libertas pxamci ds2760_battery w1_ds2760 wire > [ 672.120641] CPU: 0 Tainted: G W (2.6.34-rc6 #154) > [ 672.126376] PC is at mutex_lock+0x4/0x14 > [ 672.130291] LR is at make_reservation+0x74/0x328 > [ 672.134880] pc : [] lr : [] psr: 60000013 > [ 672.134890] sp : c775fd18 ip : 00000088 fp : 000000ac > [ 672.146281] r10: 00000000 r9 : 00000000 r8 : c7eb8000 > [ 672.151469] r7 : 00000088 r6 : c7a68310 r5 : c7eb8000 r4 : 00000001 > [ 672.157947] r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : 000000ac > [ 672.164429] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel > [ 672.171691] Control: 0000397f Table: a7f54018 DAC: 00000035 > [ 672.177394] Process flush-ubifs_0_0 (pid: 1289, stack limit = 0xc775e278) > [ 672.184131] Stack: (0xc775fd18 to 0xc7760000) > [ 672.188458] fd00: c7f5ea00 00000000 > [ 672.196588] fd20: 00000000 c775fde0 c7f6c000 000000a0 00000001 c7eb8144 00000000 c775e000 > [ 672.204721] fd40: 00000001 00000088 00000004 00000000 00000004 c7a68310 c7eb8000 c7a68310 > [ 672.212853] fd60: 00000000 000000a0 c6894180 00000000 00000000 c0143aa4 c775fde0 000006d0 > [ 672.220978] fd80: 0000a1e0 c7eb8000 c775fdb4 c015634c 00000001 00000080 c7a68310 00000001 > [ 672.229111] fda0: c7a68458 c7eb8000 00000000 00000000 00000063 c01489b0 c775fe74 c0085400 > [ 672.237245] fdc0: c775e000 c775e000 c7a68310 c0558b00 00000063 c014559c c7a683ac c7a683ac > [ 672.245377] fde0: 00000001 c775fef0 00000400 00000000 ffffffff c775fe34 00000000 c008b2e4 > [ 672.253510] fe00: c0558b00 c008bb3c 0000000e c00865b4 00000007 ffffffff c7a683ac c008b2d0 > [ 672.261642] fe20: c7a683ac 00000001 00000001 00000001 c775fe5c 00000001 00000000 c0558b00 > [ 672.269767] fe40: c062cf40 c062cf60 c0629080 c06290a0 c06290c0 c06290e0 c062cd60 00000000 > [ 672.277900] fe60: c062d0a0 00006872 00000000 c775fef0 00000000 00000001 c04eb4f8 00000007 > [ 672.286034] fe80: c7a68310 c775fef0 c7eb8068 c7a683ac c04eb4f8 c775fef0 c7eb8088 c00c3f28 > [ 672.294166] fea0: 00000000 c7a68310 00000000 c7eb8068 c7e12600 c00c4b48 c0246d3c c7eb8090 > [ 672.302298] fec0: c7ac17b0 c7a68318 c7eb8068 00000000 c7eb8090 c0537a6c c775fef0 00000400 > [ 672.310431] fee0: c775ff60 00000000 c7eb8068 c00c4d98 c7eb8008 00000000 00000000 00000000 > [ 672.318555] ff00: 0000a277 00000400 00000000 00000000 00000000 00000000 ffffffff 7fffffff > [ 672.326680] ff20: 00000000 00000000 c035b804 c0053aa8 c04f1f08 c04f1dbc c77a9f04 c68958c0 > [ 672.334813] ff40: c7eb8068 0000a270 c775ff60 00000000 00000000 c7eb80a8 00000001 c00c4f74 > [ 672.342944] ff60: 00000009 00000000 00000000 00000000 00000000 000001f4 c775e000 0000a270 > [ 672.351070] ff80: c7eb8068 c04eb4f8 c04f22b0 0000000a 00007530 c00c50e0 00000000 c7eb8008 > [ 672.359202] ffa0: c7eb8068 c7eb8068 c0095e18 00000000 00000000 00000000 00000000 c0095ec0 > [ 672.367328] ffc0: c775ffd4 c7c4bf2c c7eb8068 c006ac50 00000000 00000000 c775ffd8 c775ffd8 > [ 672.375459] ffe0: 00000000 00000000 00000000 00000000 00000000 c00458bc 5f455349 48504943 > [ 672.383609] [] (mutex_lock+0x4/0x14) from [] (make_reservation+0x74/0x328) > [ 672.392184] [] (make_reservation+0x74/0x328) from [] (ubifs_jnl_write_inode+0x80/0x1b8) > [ 672.401871] [] (ubifs_jnl_write_inode+0x80/0x1b8) from [] (ubifs_write_inode+0x64/0xc4) > [ 672.411554] [] (ubifs_write_inode+0x64/0xc4) from [] (ubifs_writepage+0x124/0x15c) > [ 672.420830] [] (ubifs_writepage+0x124/0x15c) from [] (__writepage+0x14/0x64) > [ 672.429572] [] (__writepage+0x14/0x64) from [] (write_cache_pages+0x1e4/0x2c0) > [ 672.438498] [] (write_cache_pages+0x1e4/0x2c0) from [] (writeback_single_inode+0xd4/0x2b8) > [ 672.448447] [] (writeback_single_inode+0xd4/0x2b8) from [] (writeback_inodes_wb+0x434/0x52c) > [ 672.458568] [] (writeback_inodes_wb+0x434/0x52c) from [] (wb_writeback+0x158/0x1cc) > [ 672.467907] [] (wb_writeback+0x158/0x1cc) from [] (wb_do_writeback+0x64/0x198) > [ 672.476815] [] (wb_do_writeback+0x64/0x198) from [] (bdi_writeback_task+0x38/0xbc) > [ 672.486084] [] (bdi_writeback_task+0x38/0xbc) from [] (bdi_start_fn+0xa8/0xf8) > [ 672.495009] [] (bdi_start_fn+0xa8/0xf8) from [] (kthread+0x78/0x80) > [ 672.502992] [] (kthread+0x78/0x80) from [] (kernel_thread_exit+0x0/0x8) > [ 672.511293] Code: 05843000 e28dd010 e8bd81f0 e3a02000 (e1001092) > [ 672.517534] ---[ end trace f5c79b7be5adbe31 ]--- > Sent SIGKILL to all processes > Requesting system reboot[ 674.543613] Restarting system. >