Re: [Bugme-new] [Bug 18912] New: BUG: unable to handle kernel NULL pointer dereference at (null)
From: Andrew Morton <akpm@linux-foundation.org>
Date: 2010-09-20 23:11:53
(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). On Mon, 20 Sep 2010 22:34:17 GMT bugzilla-daemon@bugzilla.kernel.org wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=18912 Summary: BUG: unable to handle kernel NULL pointer dereference at (null) Product: IO/Storage Version: 2.5 Kernel Version: 2.6.35 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Other AssignedTo: io_other@kernel-bugs.osdl.org ReportedBy: thomas.creutz@gmx.de Regression: No Created an attachment (id=30872) --> (https://bugzilla.kernel.org/attachment.cgi?id=30872) full dmesg at restart with ubuntu mainline kernel from there (http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.35.4-maverick/) I get the following bug:
This is a bit strange. We dereferenced a NULL pointer in __mutex_lock_slowpath(), but where did it come from? fb_release() does mutex_lock(&info->lock); but for that to be exactly zero, `info' must have been a small negative number.
[ 43.635104] BUG: unable to handle kernel NULL pointer dereference at (null) [ 43.635125] IP: [<ffffffff81576249>] __mutex_lock_slowpath+0xa9/0x170 [ 43.635144] PGD 2333cd067 PUD 2333ce067 PMD 0 [ 43.635159] Oops: 0002 [#1] SMP [ 43.635171] last sysfs file: /sys/devices/platform/f71882fg.2560/temp3_input [ 43.635185] CPU 4 [ 43.635188] Modules linked in: ipt_LOG ip6t_LOG ip6t_rt ipt_REDIRECT xt_multiport xt_recent xt_tcpudp xt_limit nf_conntrack_ipv6 xt_state ip6table_filter ip6_tables iptable_mangle iptable_nat nf_nat iptable_filter nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables nouveau ttm drm_kms_helper drm i7core_edac i2c_algo_bit edac_core f71882fg coretemp raid10 raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy async_tx raid0 multipath linear raid1 r8169 mii ahci libahci [ 43.635293] [ 43.635297] Pid: 451, comm: plymouthd Not tainted 2.6.35-02063504-generic #201008271919 MSI X58 Pro-E (MS-7522)/MS-7522 [ 43.635305] RIP: 0010:[<ffffffff81576249>] [<ffffffff81576249>] __mutex_lock_slowpath+0xa9/0x170 [ 43.635315] RSP: 0018:ffff8802331cbe18 EFLAGS: 00010246 [ 43.635321] RAX: ffff8802331cbe28 RBX: ffff88023429000c RCX: 00000000ffffffff [ 43.635327] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff88023429000c [ 43.635334] RBP: ffff8802331cbe78 R08: 0000000000000000 R09: 0000000000000000 [ 43.635340] R10: 00007fff508c4d70 R11: 0000000000000246 R12: ffff880234290008 [ 43.635346] R13: ffff880232fa8000 R14: ffff880232fa8000 R15: ffff880234290010 [ 43.635353] FS: 00007f374ac96700(0000) GS:ffff880001e80000(0000) knlGS:0000000000000000 [ 43.635360] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.635365] CR2: 0000000000000000 CR3: 00000002331a0000 CR4: 00000000000006a0 [ 43.635372] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 43.635378] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 43.635385] Process plymouthd (pid: 451, threadinfo ffff8802331ca000, task ffff880232fa8000) [ 43.635392] Stack: [ 43.635395] ffff8802331cbe28 ffffffff815774fe ffff880234290010 ffffffff8113e2a6 [ 43.635407] <0> ffff880001e8f970 ffffea0007ad5ff0 ffff880231892cf0 ffff880234290008 [ 43.635420] <0> ffff880234290008 ffff8802342980d0 ffff880226b35c00 ffff8802342980d0 [ 43.635434] Call Trace: [ 43.635440] [<ffffffff815774fe>] ? _raw_spin_lock+0xe/0x20 [ 43.635447] [<ffffffff8113e2a6>] ? add_partial+0x56/0x90 [ 43.635453] [<ffffffff81575ecb>] mutex_lock+0x2b/0x50 [ 43.635460] [<ffffffff812e4839>] fb_release+0x29/0x70 [ 43.635467] [<ffffffff81152d63>] __fput+0xf3/0x220 [ 43.635472] [<ffffffff81152eac>] fput+0x1c/0x30 [ 43.635478] [<ffffffff8114f6bd>] filp_close+0x5d/0x90 [ 43.635484] [<ffffffff8115095f>] sys_close+0xaf/0x110 [ 43.635492] [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b [ 43.635591] Code: 75 07 41 83 7e 20 63 7f b1 49 8d 5c 24 04 4d 8d 7c 24 08 48 89 df e8 b7 12 00 00 49 8b 57 08 48 8d 45 b0 4c 89 7d b0 49 89 47 08 <48> 89 02 48 89 55 b8 ba ff ff ff ff 4c 89 75 c0 89 d0 41 87 04 [ 43.635716] RIP [<ffffffff81576249>] __mutex_lock_slowpath+0xa9/0x170 [ 43.635724] RSP <ffff8802331cbe18> [ 43.635728] CR2: 0000000000000000 [ 43.635732] ---[ end trace 977d55bf15636e33 ]--- Kernel is 2.6.35-02063504-generic
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