netdev - OOPS: unable to handle kernel NULL pointer dereference in unix_detach

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Date:	Mon, 22 Dec 2014 21:52:14 +0100
From:	Wolfgang Walter <linux@...m.de>
To:	netdev@...r.kernel.org
Subject: OOPS: unable to handle kernel NULL pointer dereference in unix_detach_fds

Hello,

today I saw this oops with kernel 3.18.1:

Dec 22 14:30:26 hobel kernel: [   37.476849] BUG: unable to handle kernel NULL pointer dereference at 0000000000000001
Dec 22 14:30:26 hobel kernel: [   37.476856] IP: [<ffffffff81a7c70c>] unix_detach_fds.isra.28+0x1c/0x50
Dec 22 14:30:26 hobel kernel: [   37.476862] PGD a90ab067 PUD a8d2c067 PMD 0 
Dec 22 14:30:26 hobel kernel: [   37.476866] Oops: 0000 [#1] PREEMPT SMP 
Dec 22 14:30:26 hobel kernel: [   37.476868] Modules linked in: bnep bluetooth rfkill vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) nfsd xt_conntrack xt_socket xt_helper nf_conntrack_tftp nf_conntrack_snmp nf_conntrack_broadcast nf_conntrack_sip nf_conntrack_irc nf_conntrack_h323 nf_conntrack_ftp nf_conntrack_ipv6 nf_defrag_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack uvcvideo videobuf2_vmalloc snd_usb_audio snd_hwdep snd_usbmidi_lib snd_rawmidi nvidia(PO) i2c_piix4
Dec 22 14:30:26 hobel kernel: [   37.476887] CPU: 4 PID: 2234 Comm: plasma-desktop Tainted: P           O   3.18.1-ei+6.9 #2
Dec 22 14:30:26 hobel kernel: [   37.476890] Hardware name: System manufacturer System Product Name/M4A89GTD-PRO/USB3, BIOS 1104    03/12/2010
Dec 22 14:30:26 hobel kernel: [   37.476892] task: ffff88022aa2e320 ti: ffff8800aebec000 task.ti: ffff8800aebec000
Dec 22 14:30:26 hobel kernel: [   37.476894] RIP: 0010:[<ffffffff81a7c70c>]  [<ffffffff81a7c70c>] unix_detach_fds.isra.28+0x1c/0x50
Dec 22 14:30:26 hobel kernel: [   37.476897] RSP: 0018:ffff8800aebefb68  EFLAGS: 00010202
Dec 22 14:30:26 hobel kernel: [   37.476898] RAX: 0000000000000001 RBX: 0000000040000040 RCX: 00000000000000f0
Dec 22 14:30:26 hobel kernel: [   37.476900] RDX: 0000000000000006 RSI: ffff880206110300 RDI: ffff8800aebefc18
Dec 22 14:30:26 hobel kernel: [   37.476901] RBP: ffff8800aebefb78 R08: 0000000000000000 R09: ffff88022f001700
Dec 22 14:30:26 hobel kernel: [   37.476902] R10: ffff880206110300 R11: 00000000000000f0 R12: ffff8800aebefc18
Dec 22 14:30:26 hobel kernel: [   37.476904] R13: 0000000000000000 R14: ffff8802076a2710 R15: ffff880206110300
Dec 22 14:30:26 hobel kernel: [   37.476906] FS:  00007f3a37991800(0000) GS:ffff880237d00000(0000) knlGS:0000000000000000
Dec 22 14:30:26 hobel kernel: [   37.476907] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Dec 22 14:30:26 hobel kernel: [   37.476909] CR2: 0000000000000001 CR3: 00000000a9190000 CR4: 00000000000007e0
Dec 22 14:30:26 hobel kernel: [   37.476910] Stack:
Dec 22 14:30:26 hobel kernel: [   37.476911]  0000000040000040 ffff8802076a2680 ffff8800aebefc88 ffffffff81a7caec
Dec 22 14:30:26 hobel kernel: [   37.476914]  ffff8800a8d0ba01 ffff88022aa2e320 ffff8800aebefc48 ffff88022aa2e320
Dec 22 14:30:26 hobel kernel: [   37.476916]  ffff8802076a2938 000000010000000d 0000000000000000 0000000700000000
Dec 22 14:30:26 hobel kernel: [   37.476918] Call Trace:
Dec 22 14:30:26 hobel kernel: [   37.476922]  [<ffffffff81a7caec>] unix_stream_recvmsg+0x32c/0x870
Dec 22 14:30:26 hobel kernel: [   37.476925]  [<ffffffff81a7dedb>] ? unix_stream_sendmsg+0x3fb/0x430
Dec 22 14:30:26 hobel kernel: [   37.476928]  [<ffffffff819416ae>] sock_recvmsg+0x6e/0x90
Dec 22 14:30:26 hobel kernel: [   37.476931]  [<ffffffff81201280>] ? poll_select_copy_remaining+0x130/0x130
Dec 22 14:30:26 hobel kernel: [   37.476933]  [<ffffffff81201280>] ? poll_select_copy_remaining+0x130/0x130
Dec 22 14:30:26 hobel kernel: [   37.476936]  [<ffffffff819501a2>] ? verify_iovec+0x42/0xd0
Dec 22 14:30:26 hobel kernel: [   37.476938]  [<ffffffff819427b6>] ___sys_recvmsg+0x106/0x2e0
Dec 22 14:30:26 hobel kernel: [   37.476941]  [<ffffffff81201280>] ? poll_select_copy_remaining+0x130/0x130
Dec 22 14:30:26 hobel kernel: [   37.476943]  [<ffffffff8123078b>] ? eventfd_ctx_read+0x1ab/0x220
Dec 22 14:30:26 hobel kernel: [   37.476946]  [<ffffffff81133e70>] ? wake_up_process+0x50/0x50
Dec 22 14:30:26 hobel kernel: [   37.476949]  [<ffffffff8120a704>] ? __fget+0x74/0xb0
Dec 22 14:30:26 hobel kernel: [   37.476952]  [<ffffffff8120a77f>] ? __fget_light+0x1f/0x80
Dec 22 14:30:26 hobel kernel: [   37.476954]  [<ffffffff81943e84>] __sys_recvmsg+0x44/0x80
Dec 22 14:30:26 hobel kernel: [   37.476957]  [<ffffffff81943ecd>] SyS_recvmsg+0xd/0x20
Dec 22 14:30:26 hobel kernel: [   37.476961]  [<ffffffff81b34c69>] system_call_fastpath+0x12/0x17
Dec 22 14:30:26 hobel kernel: [   37.476962] Code: ff ff 48 8b 5d f0 4c 8b 65 f8 c9 c3 0f 1f 00 55 48 8b 46 38 48 89 e5 41 54 49 89 fc 53 48 89 07 48 c7 46 38 00 00 00 00 48 8b 07 <0f> bf 18 ff cb 79 09 eb 1b 0f 1f 00 49 8b 04 24 48 63 d3 ff cb 
Dec 22 14:30:26 hobel kernel: [   37.476983] RIP  [<ffffffff81a7c70c>] unix_detach_fds.isra.28+0x1c/0x50
Dec 22 14:30:26 hobel kernel: [   37.476985]  RSP <ffff8800aebefb68>
Dec 22 14:30:26 hobel kernel: [   37.476986] CR2: 0000000000000001
Dec 22 14:30:26 hobel kernel: [   37.476988] ---[ end trace 05163e1048a933ce ]---

Regards,
-- 
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
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