linux-kernel - [tty bug] kernel BUG at drivers/char/tty

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Date:	Tue, 13 Jan 2009 13:10:39 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: [tty bug] kernel BUG at drivers/char/tty_ldisc.c:359!


FYI, -tip testing found a new warning in drivers/char/tty_ldisc.c:

[   37.725942] device: 'vcsa6': device_add
[   37.725970] PM: Adding info for No Bus:vcsa6
[   37.732059] ------------[ cut here ]------------
[   37.732063] kernel BUG at drivers/char/tty_ldisc.c:359!
[   37.732066] invalid opcode: 0000 [#1] SMP 
[   37.732069] last sysfs file: /sys/devices/system/cpu/cpu1/online
[   37.732072] Modules linked in:
[   37.732074] 
[   37.732078] Pid: 2179, comm: agetty Not tainted (2.6.29-rc1-tip #16016) System Product Name
[   37.732081] EIP: 0060:[<c03b405f>] EFLAGS: 00010246 CPU: 0
[   37.732088] EIP is at tty_ldisc_deref+0x6f/0x80
[   37.732090] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
[   37.732093] ESI: 00000000 EDI: 00000002 EBP: f5aeae64 ESP: f5aeae58
[   37.732095]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[   37.732099] Process agetty (pid: 2179, ti=f5aea000 task=f6528000 task.ti=f5aea000)
[   37.732102] Stack:
[   37.732103]  00000002 f5a1e000 00000000 f5aeae7c c03b2dd2 00000000 f5a1e000 f5a1e000
[   37.732110]  f5a1e000 f5aeae94 c03b39c8 c03b4e00 f5a1e000 f653b300 f5a1e000 f5aeaea8
[   37.732118]  c03b052c 00000002 c03b0500 f653b300 f5aeaef8 c03ae853 00000002 f5aeaf70
[   37.732127] Call Trace:
[   37.732129]  [<c03b2dd2>] ? tty_perform_flush+0x82/0xa0
[   37.732135]  [<c03b39c8>] ? n_tty_ioctl_helper+0xf8/0x180
[   37.732140]  [<c03b4e00>] ? tty_buffer_flush+0xb0/0xc0
[   37.732144]  [<c03b052c>] ? n_tty_ioctl+0x2c/0xe0
[   37.732148]  [<c03b0500>] ? n_tty_ioctl+0x0/0xe0
[   37.732152]  [<c03ae853>] ? tty_ioctl+0xb3/0x880
[   37.732156]  [<c0315cf3>] ? inode_has_perm+0x53/0x80
[   37.732162]  [<c01da53b>] ? mnt_drop_write+0x4b/0xf0
[   37.732167]  [<c03ae7a0>] ? tty_ioctl+0x0/0x880
[   37.732171]  [<c01cf68d>] ? vfs_ioctl+0x2d/0x90
[   37.732175]  [<c01cfacd>] ? do_vfs_ioctl+0x2dd/0x510
[   37.732178]  [<c0315dc1>] ? file_has_perm+0xa1/0xb0
[   37.732183]  [<c0318446>] ? selinux_file_ioctl+0x46/0x50
[   37.732188]  [<c01cfd57>] ? sys_ioctl+0x57/0x70
[   37.732191]  [<c010404b>] ? sysenter_do_call+0x12/0x3f
[   37.732197] Code: 24 00 00 00 00 e8 22 44 d7 ff 89 f2 b8 c0 5d c5 c0 e8 e6 16 52 00 83 c4 04 5b 5e 5d c3 c7 04 24 c8 0f b4 c0 e8 63 6c d8 ff eb bd <0f> 0b eb fe 8d b6 00 00 00 00 8d bc 27 00 00 00 00 55 89 e5 57 
[   37.732235] EIP: [<c03b405f>] tty_ldisc_deref+0x6f/0x80 SS:ESP 0068:f5aeae58
[   37.732242] ---[ end trace 592f7f7fd8339f40 ]---

kernel 37a76bd. No prior kernel showed this warning.

	Ingo

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