[Bugme-new] [Bug 19512] New: kmemcheck reports reads from uninitialized memory in drm_kms_helper when switching vt from X
bugzilla-daemon at bugzilla.kernel.org
bugzilla-daemon at bugzilla.kernel.org
Sat Oct 2 03:58:56 PDT 2010
https://bugzilla.kernel.org/show_bug.cgi?id=19512
Summary: kmemcheck reports reads from uninitialized memory in
drm_kms_helper when switching vt from X
Product: Drivers
Version: 2.5
Kernel Version: 2.6.35.6 (+ tuxonice patches)
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI - Intel)
AssignedTo: drivers_video-dri-intel at kernel-bugs.osdl.org
ReportedBy: sliedes at cc.hut.fi
Regression: No
After starting X in a computer with kmemcheck turned on in kernel config, I get
the following warnings when switching to a text console with alt-ctrl-F1:
WARNING: kmemcheck: Caught 16-bit read from uninitialized memory
(ffff880132b57a20)
0000000000000000000000000000000000000000000000000000000000000000
u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u
^
Pid: 3852, comm: Xorg Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire
5810T/Aspire 5810T
RIP: 0010:[<ffffffffa04550a7>] [<ffffffffa04550a7>]
drm_fb_helper_setcmap+0xa7/0x390 [drm_kms_helper]
RSP: 0018:ffff8801329f3908 EFLAGS: 00010206
RAX: 0000000000000010 RBX: 0000000000000020 RCX: 0000000000000000
RDX: ffff880132b57a00 RSI: 000000000000000f RDI: ffff880132b57050
RBP: ffff8801329f39b8 R08: 0000000000000000 R09: ffff880130158800
R10: 2222222222222222 R11: 00000000000000ff R12: 0000000000000010
R13: ffff880132b570b0 R14: ffff880132b57000 R15: 0000000000000010
FS: 00007fa9d195f700(0000) GS:ffff880002800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffff880130158978 CR3: 00000001329a1000 CR4: 00000000000406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
[<ffffffffa0404805>] fb_set_cmap+0x65/0x150 [fb]
[<ffffffffa0401672>] fb_set_var+0x1a2/0x390 [fb]
[<ffffffffa01258cc>] fbcon_blank+0x17c/0x250 [fbcon]
[<ffffffff81342193>] do_unblank_screen+0xa3/0x170
[<ffffffff81338029>] complete_change_console+0x59/0xf0
[<ffffffff81339c52>] vt_ioctl+0x1af2/0x1d90
[<ffffffff8132e0ad>] tty_ioctl+0x9d/0x9a0
[<ffffffff8113b4d8>] vfs_ioctl+0x38/0xd0
[<ffffffff8113b6aa>] do_vfs_ioctl+0x8a/0x580
[<ffffffff8113bbea>] sys_ioctl+0x4a/0x80
[<ffffffff81002dab>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
WARNING: kmemcheck: Caught 16-bit read from uninitialized memory
(ffff880132b57820)
0000000000000000000000000000000000000000000000000000000000000000
u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u
^
Pid: 3852, comm: Xorg Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire
5810T/Aspire 5810T
RIP: 0010:[<ffffffffa04550b2>] [<ffffffffa04550b2>]
drm_fb_helper_setcmap+0xb2/0x390 [drm_kms_helper]
RSP: 0018:ffff8801329f3908 EFLAGS: 00010206
RAX: 0000000000000010 RBX: 0000000000000020 RCX: 0000000000000000
RDX: ffff880132b57800 RSI: 000000000000000f RDI: ffff880132b57050
RBP: ffff8801329f39b8 R08: 0000000000000000 R09: ffff880130158800
R10: 2222222222222222 R11: 00000000000000ff R12: 0000000000000010
R13: ffff880132b570b0 R14: ffff880132b57000 R15: 0000000000000010
FS: 00007fa9d195f700(0000) GS:ffff880002800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffff880130158978 CR3: 00000001329a1000 CR4: 00000000000406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
[<ffffffffa0404805>] fb_set_cmap+0x65/0x150 [fb]
[<ffffffffa0401672>] fb_set_var+0x1a2/0x390 [fb]
[<ffffffffa01258cc>] fbcon_blank+0x17c/0x250 [fbcon]
[<ffffffff81342193>] do_unblank_screen+0xa3/0x170
[<ffffffff81338029>] complete_change_console+0x59/0xf0
[<ffffffff81339c52>] vt_ioctl+0x1af2/0x1d90
[<ffffffff8132e0ad>] tty_ioctl+0x9d/0x9a0
[<ffffffff8113b4d8>] vfs_ioctl+0x38/0xd0
[<ffffffff8113b6aa>] do_vfs_ioctl+0x8a/0x580
[<ffffffff8113bbea>] sys_ioctl+0x4a/0x80
[<ffffffff81002dab>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
WARNING: kmemcheck: Caught 16-bit read from uninitialized memory
(ffff880132b57620)
0000000000000000000000000000000000000000000000000000000000000000
u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u
^
Pid: 3852, comm: Xorg Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire
5810T/Aspire 5810T
RIP: 0010:[<ffffffffa04550bb>] [<ffffffffa04550bb>]
drm_fb_helper_setcmap+0xbb/0x390 [drm_kms_helper]
RSP: 0018:ffff8801329f3908 EFLAGS: 00010206
RAX: 0000000000000010 RBX: 0000000000000020 RCX: 0000000000000000
RDX: ffff880132b57600 RSI: 000000000000000f RDI: ffff880132b57050
RBP: ffff8801329f39b8 R08: 0000000000000000 R09: ffff880130158800
R10: 2222222222222222 R11: 0000000000000000 R12: 0000000000000010
R13: ffff880132b570b0 R14: ffff880132b57000 R15: 0000000000000010
FS: 00007fa9d195f700(0000) GS:ffff880002800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffff880130158978 CR3: 00000001329a1000 CR4: 00000000000406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
[<ffffffffa0404805>] fb_set_cmap+0x65/0x150 [fb]
[<ffffffffa0401672>] fb_set_var+0x1a2/0x390 [fb]
[<ffffffffa01258cc>] fbcon_blank+0x17c/0x250 [fbcon]
[<ffffffff81342193>] do_unblank_screen+0xa3/0x170
[<ffffffff81338029>] complete_change_console+0x59/0xf0
[<ffffffff81339c52>] vt_ioctl+0x1af2/0x1d90
[<ffffffff8132e0ad>] tty_ioctl+0x9d/0x9a0
[<ffffffff8113b4d8>] vfs_ioctl+0x38/0xd0
[<ffffffff8113b6aa>] do_vfs_ioctl+0x8a/0x580
[<ffffffff8113bbea>] sys_ioctl+0x4a/0x80
[<ffffffff81002dab>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
WARNING: kmemcheck: Caught 16-bit read from uninitialized memory
(ffff880132b57a22)
0000000000000000000000000000000000000000000000000000000000000000
i i u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u
^
Pid: 3852, comm: Xorg Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire
5810T/Aspire 5810T
RIP: 0010:[<ffffffffa04550a7>] [<ffffffffa04550a7>]
drm_fb_helper_setcmap+0xa7/0x390 [drm_kms_helper]
RSP: 0018:ffff8801329f3908 EFLAGS: 00010212
RAX: 0000000000000011 RBX: 0000000000000022 RCX: 0000000000000000
RDX: ffff880132b57a00 RSI: 0000000000000010 RDI: ffff880132b57050
RBP: ffff8801329f39b8 R08: 0000000000000000 R09: ffff880130158800
R10: 2222222222222222 R11: 0000000000000000 R12: 0000000000000011
R13: ffff880132b570b0 R14: ffff880132b57000 R15: 0000000000000011
FS: 00007fa9d195f700(0000) GS:ffff880002800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffff880130158978 CR3: 00000001329a1000 CR4: 00000000000406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
[<ffffffffa0404805>] fb_set_cmap+0x65/0x150 [fb]
[<ffffffffa0401672>] fb_set_var+0x1a2/0x390 [fb]
[<ffffffffa01258cc>] fbcon_blank+0x17c/0x250 [fbcon]
[<ffffffff81342193>] do_unblank_screen+0xa3/0x170
[<ffffffff81338029>] complete_change_console+0x59/0xf0
[<ffffffff81339c52>] vt_ioctl+0x1af2/0x1d90
[<ffffffff8132e0ad>] tty_ioctl+0x9d/0x9a0
[<ffffffff8113b4d8>] vfs_ioctl+0x38/0xd0
[<ffffffff8113b6aa>] do_vfs_ioctl+0x8a/0x580
[<ffffffff8113bbea>] sys_ioctl+0x4a/0x80
[<ffffffff81002dab>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
WARNING: kmemcheck: Caught 16-bit read from uninitialized memory
(ffff880132b57822)
0000000000000000000000000000000000000000000000000000000000000000
i i u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u
^
Pid: 3852, comm: Xorg Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire
5810T/Aspire 5810T
RIP: 0010:[<ffffffffa04550b2>] [<ffffffffa04550b2>]
drm_fb_helper_setcmap+0xb2/0x390 [drm_kms_helper]
RSP: 0018:ffff8801329f3908 EFLAGS: 00010212
RAX: 0000000000000011 RBX: 0000000000000022 RCX: 0000000000000000
RDX: ffff880132b57800 RSI: 0000000000000010 RDI: ffff880132b57050
RBP: ffff8801329f39b8 R08: 0000000000000000 R09: ffff880130158800
R10: 2222222222222222 R11: 0000000000000000 R12: 0000000000000011
R13: ffff880132b570b0 R14: ffff880132b57000 R15: 0000000000000011
FS: 00007fa9d195f700(0000) GS:ffff880002800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffff880130158978 CR3: 00000001329a1000 CR4: 00000000000406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
[<ffffffffa0404805>] fb_set_cmap+0x65/0x150 [fb]
[<ffffffffa0401672>] fb_set_var+0x1a2/0x390 [fb]
[<ffffffffa01258cc>] fbcon_blank+0x17c/0x250 [fbcon]
[<ffffffff81342193>] do_unblank_screen+0xa3/0x170
[<ffffffff81338029>] complete_change_console+0x59/0xf0
[<ffffffff81339c52>] vt_ioctl+0x1af2/0x1d90
[<ffffffff8132e0ad>] tty_ioctl+0x9d/0x9a0
[<ffffffff8113b4d8>] vfs_ioctl+0x38/0xd0
[<ffffffff8113b6aa>] do_vfs_ioctl+0x8a/0x580
[<ffffffff8113bbea>] sys_ioctl+0x4a/0x80
[<ffffffff81002dab>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
WARNING: kmemcheck: Caught 16-bit read from uninitialized memory
(ffff880132b57622)
0000000000000000000000000000000000000000000000000000000000000000
i i u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u
^
Pid: 3852, comm: Xorg Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire
5810T/Aspire 5810T
RIP: 0010:[<ffffffffa04550bb>] [<ffffffffa04550bb>]
drm_fb_helper_setcmap+0xbb/0x390 [drm_kms_helper]
RSP: 0018:ffff8801329f3908 EFLAGS: 00010212
RAX: 0000000000000011 RBX: 0000000000000022 RCX: 0000000000000000
RDX: ffff880132b57600 RSI: 0000000000000010 RDI: ffff880132b57050
RBP: ffff8801329f39b8 R08: 0000000000000000 R09: ffff880130158800
R10: 2222222222222222 R11: 0000000000000000 R12: 0000000000000011
R13: ffff880132b570b0 R14: ffff880132b57000 R15: 0000000000000011
FS: 00007fa9d195f700(0000) GS:ffff880002800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffff880130158978 CR3: 00000001329a1000 CR4: 00000000000406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
[<ffffffffa0404805>] fb_set_cmap+0x65/0x150 [fb]
[<ffffffffa0401672>] fb_set_var+0x1a2/0x390 [fb]
[<ffffffffa01258cc>] fbcon_blank+0x17c/0x250 [fbcon]
[<ffffffff81342193>] do_unblank_screen+0xa3/0x170
[<ffffffff81338029>] complete_change_console+0x59/0xf0
[<ffffffff81339c52>] vt_ioctl+0x1af2/0x1d90
[<ffffffff8132e0ad>] tty_ioctl+0x9d/0x9a0
[<ffffffff8113b4d8>] vfs_ioctl+0x38/0xd0
[<ffffffff8113b6aa>] do_vfs_ioctl+0x8a/0x580
[<ffffffff8113bbea>] sys_ioctl+0x4a/0x80
[<ffffffff81002dab>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
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