[Bug 1808626] Re: Triple buffer flickering and weird display updating
And another video of just dragging the display settings window around: https://www.youtube.com/watch?v=8Eo9hzA51X4 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1808626 Title: Triple buffer flickering and weird display updating To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1808626/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1808626] Re: Triple buffer flickering and weird display updating
Been fiddling with rotating and unrotating displays and when it starts drawing improperly when rotated, I can unrotate the displays and the improper drawing/flickering disappears. Also the improper drawing disappears when I go to mirror mode. I would imagine most people don't see this bug because few people have one monitor rotated left and have a second monitor in normal orientation. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1808626 Title: Triple buffer flickering and weird display updating To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1808626/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1808626] Re: Triple buffer flickering and weird display updating
I've been hesitant to try to reproduce this because my system runs so well for a long time when this doesn't crop up. So I rebooted without the video=VGA-1:e parameter and it starts doing this sort of thing immediately. I uploaded a video at youtube: https://www.youtube.com/watch?v=2JOy_ilLAlw Strangely, when I add the video=VGA-1:e parameter it comes up fine and I tried to rotate and unrotate my monitors and various manipulations with ubuntu's display settings and xrandr and I couldn't get it to do the flickering thing. And I think I misspoke, it doesn't seem like triple buffering flicker but perhaps double buffering flicker. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1808626 Title: Triple buffer flickering and weird display updating To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1808626/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1808626] Re: Triple buffer flickering and weird display updating
I've been running the same setup and it runs absolutely perfectly if I boot up with editing the Ubuntu command line in grub and add video=VGA-1:e BOOT_IMAGE=/boot/vmlinuz-4.15.0-43-generic root=UUID= ro drm_kms_helper.edid_firmware=VGA-1:edid/hannsg.bin video=VGA-1:e adding the video=VGA-1:e will allow the drm_kms_helper.edid_firmware parameter to work and I get my proper display. If I don't add the video=VGA-1:e line it will come up at 1024x768 mode and give a "Could not apply the stored configuration for monitors". After I do this following xrandr command and the stored configuration is restored I get the flickering problem virtually INSTANTLY. $ xrandr --newmode "1920x1080R" 138.50 1920 1968 2000 2080 1080 1083 1088 +hsync -vsync; xrandr --addmode VGA-1 "1920x1080R" With the video=VGA-1:e the stored configuration comes up properly on initial boot and the video drivers work perfectly, no flickering. https://ptouchman.blogspot.com/2018/12/my-edid-was-going-unrecognized- until-i.html I'll post a video when I dig out my digital camera. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1808626 Title: Triple buffer flickering and weird display updating To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1808626/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1808626] [NEW] Triple buffer flickering and weird display updating
Public bug reported: I've got a dual display setup, with one monitor rotated and I've been running into some weird bugs. The screen will not update properly at times and there will be areas that will intermittently flicker and show old areas that should have been overdrawn. Once it starts doing this, the only way to get things back to normal is to reboot. Going into standby and coming out of standby won't fix it. Actually, sometimes coming out of standby the screen won't refresh properly and I'll see the whole screen get some triple-buffer epilepsy inducing flicker. When I move the mouse from screen to screen and hover over the ubuntu launcher dock so that it scrolls the icons it will flip the triple buffers and the areas that have old data flickers. I think the display is triple buffered and one of the buffers gets old data. I can refresh the screen by dragging windows around manually like an "eraser" where I'm using the window to "erase old data" but this tends to get super annoying. It seems to get brought out by rotating one of my displays. I have a 1920x1200 pivoting display that is rotated to the left. My other display is 1920x1080 normal at position +1200+364. I seem to hit this a lot because my monitor doesn't have a good EDID so it comes up in ubuntu with an error message about crtcs (since it wants to do a 1920x1080 and it thinks the max is 1024x768) so after I set a new mode with: $ xrandr --newmode "1920x1080R" 138.50 1920 1968 2000 2080 1080 1083 1088 +hsync -vsync; xrandr --addmode VGA-1 "1920x1080R" Once the new mode gets added Ubuntu will automatically restore my desktop to its old settings pre-reboot and I start getting the flicker/update problems. I would imagine that the bug should show itself up if you do a few rotate/unrotate displays. $ lsb_release -rd Description:Ubuntu 18.04.1 LTS Release:18.04 $ apt-cache policy xserver-xorg-video-intel xserver-xorg-video-intel: Installed: 2:2.99.917+git20171229-1 Candidate: 2:2.99.917+git20171229-1 Version table: *** 2:2.99.917+git20171229-1 500 500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages 100 /var/lib/dpkg/status $ xrandr Screen 0: minimum 320 x 200, current 3120 x 1920, maximum 8192 x 8192 VGA-1 connected primary 1920x1080+1200+364 (normal left inverted right x axis y axis) 0mm x 0mm 1024x768 60.00 800x600 60.3256.25 848x480 60.00 640x480 59.94 1920x1080R59.93* HDMI-1 connected 1200x1920+0+0 left (normal left inverted right x axis y axis) 519mm x 324mm 1920x1200 59.95*+ 1600x1200 60.00 1680x1050 59.88 1600x1000 60.01 1280x1024 85.0275.0260.02 1280x960 60.00 1152x864 75.00 1152x720 59.97 1024x768 75.0360.00 832x624 74.55 800x600 75.0060.32 640x480 75.0059.94 720x400 70.08 DP-1 disconnected (normal left inverted right x axis y axis) ** Affects: xserver-xorg-video-intel (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1808626 Title: Triple buffer flickering and weird display updating To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1808626/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1808626] Re: Triple buffer flickering and weird display updating
Here's a listing of my hardware: $ lscpu Architecture:x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 4 On-line CPU(s) list: 0-3 Thread(s) per core: 2 Core(s) per socket: 2 Socket(s): 1 NUMA node(s):1 Vendor ID: GenuineIntel CPU family: 6 Model: 58 Model name: Intel(R) Core(TM) i3-3220 CPU @ 3.30GHz Stepping:9 CPU MHz: 1596.441 CPU max MHz: 3300. CPU min MHz: 1600. BogoMIPS:6585.26 Virtualization: VT-x L1d cache: 32K L1i cache: 32K L2 cache:256K L3 cache:3072K NUMA node0 CPU(s): 0-3 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 popcnt tsc_deadline_timer xsave avx f16c lahf_lm cpuid_fault epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase sme $ lspci -nn 00:00.0 Host bridge [0600]: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller [8086:0150] (rev 09) 00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller [8086:0152] (rev 09) 00:16.0 Communication controller [0780]: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 [8086:1c3a] (rev 04) 00:1a.0 USB controller [0c03]: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 [8086:1c2d] (rev 04) 00:1b.0 Audio device [0403]: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller [8086:1c20] (rev 04) 00:1c.0 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 [8086:1c10] (rev b4) 00:1c.5 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 6 [8086:1c1a] (rev b4) 00:1d.0 USB controller [0c03]: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 [8086:1c26] (rev 04) 00:1f.0 ISA bridge [0601]: Intel Corporation H61 Express Chipset Family LPC Controller [8086:1c5c] (rev 04) 00:1f.2 SATA controller [0106]: Intel Corporation 6 Series/C200 Series Chipset Family SATA AHCI Controller [8086:1c02] (rev 04) 00:1f.3 SMBus [0c05]: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller [8086:1c22] (rev 04) 02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 06) $ lspci -k 00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller (rev 09) Subsystem: Lenovo Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller Kernel driver in use: ivb_uncore Kernel modules: ie31200_edac 00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller (rev 09) Subsystem: Lenovo Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller Kernel driver in use: i915 Kernel modules: i915 00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04) Subsystem: Lenovo 6 Series/C200 Series Chipset Family MEI Controller Kernel driver in use: mei_me Kernel modules: mei_me 00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 04) Subsystem: Lenovo 6 Series/C200 Series Chipset Family USB Enhanced Host Controller Kernel driver in use: ehci-pci 00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04) Subsystem: Lenovo 6 Series/C200 Series Chipset Family High Definition Audio Controller Kernel driver in use: snd_hda_intel Kernel modules: snd_hda_intel 00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b4) Kernel driver in use: pcieport Kernel modules: shpchp 00:1c.5 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 6 (rev b4) Kernel driver in use: pcieport Kernel modules: shpchp 00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 04) Subsystem: Lenovo 6 Series/C200 Series Chipset Family USB Enhanced Host Controller Kernel driver in use: ehci-pci 00:1f.0 ISA bridge: Intel Corporation H61 Express Chipset Family LPC Controller (rev 04) Subsystem: Lenovo H61 Express Chipset Family LPC Controller Kernel driver in use: lpc_ich Kernel modules: lpc_ich 00:1f.2 SATA
[Bug 1808626] Re: Triple buffer flickering and weird display updating
I didn't think that Ubuntu's SimpleScreenRecorder would record the corruption but it records it just fine: Here's an HD video of the screen corruption: https://www.youtube.com/watch?v=6dG_awbM5oo -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1808626 Title: Triple buffer flickering and weird display updating To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1808626/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1830519] Re: firefox 67 keeps crashing on me
I decided to do a memory test by booting Ubuntu with the shift-key held down and selecting memtest and surprisingly there's some bad memory around the end of the 32GB (there's 4x8GB sticks installed). Booting with the kernel parameter mem=24000M seems to get the system back to stability. I guess the update may have used the memory space differently or maybe the memory just all of a sudden went bad. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1830519 Title: firefox 67 keeps crashing on me To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1830519/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1830519] [NEW] firefox 67 keeps crashing on me
Public bug reported:
A system that's been extremely good and stable has all of a sudden
become completely unusable after running Software Update.
After the last update, my system won't load firefox properly half of the
time. After loading pages like youtube it crashes the tab or just
crashes the entire browser. Sometimes it will immediately crash upon
launch and either restart the X server or just freeze.
I really don't know if it's firefox to blame or some kernel update.
My good system has become completely and totally unusable. Terribly
frustrating.
Ubuntu 18.04.2 LTS, firefox 67.0, core i7-2600, AMD Cedar graphics.
dmesg reports:
[ 139.743013] show_signal_msg: 36 callbacks suppressed
[ 139.743015] Web Content[2569]: segfault at 8021 ip 3e6b02233b3f sp
7ffd874d1988 error 4
[ 140.332634] apport[2683]: segfault at 8 ip 00572d98 sp
7fff0a7db4f0 error 6 in python3.6[40+3b2000]
[ 140.332651] Process 2683(apport) has RLIMIT_CORE set to 1
[ 140.332652] Aborting core
[ 162.224785] gnome-software[2707]: segfault at 55dca8ef8b68 ip
7f2ced519038 sp 7ffde7376160 error 4 in
libglib-2.0.so.0.5600.4[7f2ced4c4000+114000]
[ 221.530201] BUG: Bad page map in process IPC Launch #1 pte:696052845
pmd:78bfc6067
[ 221.530205] page:ba01da581480 count:0 mapcount:-1
mapping: index:0x0
[ 221.530208] flags: 0x17c010(dirty)
[ 221.530210] raw: 0017c010
fffe
[ 221.530212] raw: ba01da5814a0 ba01da5814a0
[ 221.530213] page dumped because: bad pte
[ 221.530215] addr:b80393c8 vm_flags:08100075
anon_vma:c17218bd mapping: (null) index:8cee1767
[ 221.530216] file: (null) fault: (null) mmap:
(null) readpage: (null)
[ 221.530218] CPU: 1 PID: 3113 Comm: IPC Launch #1 Not tainted
4.15.0-50-generic #54-Ubuntu
[ 221.530219] Hardware name: Hewlett-Packard HP Compaq 8200 Elite CMT PC/1494,
BIOS J01 v02.01 04/06/2011
[ 221.530220] Call Trace:
[ 221.530226] dump_stack+0x63/0x8b
[ 221.530228] print_bad_pte+0x222/0x2e0
[ 221.530230] unmap_page_range+0x881/0xd00
[ 221.530232] unmap_single_vma+0x7d/0xf0
[ 221.530233] unmap_vmas+0x51/0xb0
[ 221.530235] exit_mmap+0xb5/0x1c0
[ 221.530237] mmput+0x57/0x140
[ 221.530239] do_exit+0x295/0xb40
[ 221.530241] ? __do_page_fault+0x270/0x4d0
[ 221.530243] ? vfs_write+0x166/0x1a0
[ 221.530245] do_group_exit+0x43/0xb0
[ 221.530246] SyS_exit_group+0x14/0x20
[ 221.530248] do_syscall_64+0x73/0x130
[ 221.530257] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[ 221.530259] RIP: 0033:0x7fd2f674ae06
[ 221.530260] RSP: 002b:7fd2c8385518 EFLAGS: 0206 ORIG_RAX:
00e7
[ 221.530261] RAX: ffda RBX: 7fd2c420a540 RCX: 7fd2f674ae06
[ 221.530262] RDX: RSI: 003c RDI:
[ 221.530262] RBP: 7fd2c838552f R08: 00e7 R09: ff58
[ 221.530263] R10: 0058 R11: 0206 R12: 03e8
[ 221.530264] R13: R14: 7fd2c83856e0 R15: 7fd2c420a540
[ 221.530265] Disabling lock debugging due to kernel taint
[ 221.535775] BUG: Bad rss-counter state mm:d3b63ddd idx:0 val:-1
[ 221.535779] BUG: Bad rss-counter state mm:d3b63ddd idx:1 val:1
[ 221.782881] BUG: Bad page map in process JS Helper pte:80069e0e6025
pmd:78a4ee067
[ 221.782886] page:ba01da783980 count:0 mapcount:-1
mapping: index:0x0
[ 221.782889] flags: 0x17c004(referenced)
[ 221.782891] raw: 0017c004
fffe
[ 221.782893] raw: ba01da7839a0 ba01da7839a0
[ 221.782894] page dumped because: bad pte
[ 221.782897] addr:9865cc11 vm_flags:0871 anon_vma:
(null) mapping:a5605d93 index:97
[ 221.782903] file:{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}.xpi
fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
[ 221.782906] CPU: 3 PID: 2951 Comm: JS Helper Tainted: GB
4.15.0-50-generic #54-Ubuntu
[ 221.782907] Hardware name: Hewlett-Packard HP Compaq 8200 Elite CMT PC/1494,
BIOS J01 v02.01 04/06/2011
[ 221.782908] Call Trace:
[ 221.782914] dump_stack+0x63/0x8b
[ 221.782916] print_bad_pte+0x222/0x2e0
[ 221.782918] unmap_page_range+0x881/0xd00
[ 221.782920] unmap_single_vma+0x7d/0xf0
[ 221.782922] unmap_vmas+0x51/0xb0
[ 221.782924] exit_mmap+0xb5/0x1c0
[ 221.782926] mmput+0x57/0x140
[ 221.782928] do_exit+0x295/0xb40
[ 221.782930] do_group_exit+0x43/0xb0
[ 221.782932] get_signal+0x27b/0x590
[ 221.782935] do_signal+0x37/0x730
[ 221.782939] ? do_futex+0x325/0x500
[ 221.782941] ? SyS_madvise+0x4ac/0x920
[ 221.782943] ? SyS_futex+0x13b/0x180
[ 221.782945] exit_to_usermode_loop+0x73/0xd0
[ 221.782947] do_syscall_64+0x121/0x130
[
[Bug 1829415] Re: printing bitset to_string().c_str() in template produces junk
I took the code out of the bigger program and made another small program
to show the bug:
=
#include
#include
#include
#include
#include
#include
template const char * mybitset(mytype myobj){
return std::bitset(myobj).to_string().c_str(); }
template const char * mybitset2(int myobj){ return
std::bitset(myobj).to_string().c_str(); }
#define bitsetvalue 0x255+0xf000
int main (int argc, char *argv[]) {
printf("COMPILER VERSION %s\n",__VERSION__);
printf("bitset 32 %s \n",std::bitset<32>(bitsetvalue).to_string().c_str());
printf("bitset 16 %s \n",std::bitset<16>(bitsetvalue).to_string().c_str());
printf("bitset 15 %s \n",std::bitset<15>(bitsetvalue).to_string().c_str());
printf("testing mybitset 32 %s \n",mybitset<32,int>(bitsetvalue));
printf("testing mybitset 16 %s \n",mybitset<16,int>(bitsetvalue));
printf("testing mybitset 15 %s \n",mybitset<15,int>(bitsetvalue));
printf("testing mybitset 15 %s \n",mybitset<15>(bitsetvalue));
printf("testing mybitset %s size %ld
\n",mybitset<32>(bitsetvalue),strlen(mybitset<32>(bitsetvalue)));
printf("testing mybitset %s size %ld
\n",mybitset<32,int>(bitsetvalue),strlen(mybitset<32,int>(bitsetvalue)));
printf("testing mybitset %s size %ld
\n",mybitset<4,int>(bitsetvalue),strlen(mybitset<4,int>(bitsetvalue)));
printf("testing mybitset %s size %ld
\n",mybitset<8,int>(bitsetvalue),strlen(mybitset<8,int>(bitsetvalue)));
printf("testing mybitset %s size %ld
\n",mybitset<12,int>(bitsetvalue),strlen(mybitset<12,int>(bitsetvalue)));
printf("testing mybitset %s size %ld
\n",mybitset<15,int>(bitsetvalue),strlen(mybitset<15,int>(bitsetvalue)));
printf("testing mybitset %s size %ld
\n",mybitset<16,int>(bitsetvalue),strlen(mybitset<16,int>(bitsetvalue)));
printf("testing mybitset2 16 %s \n",mybitset2<16>(bitsetvalue));
printf("testing mybitset2 15 %s \n",mybitset2<15>(bitsetvalue));
}
=
and the output gets:
$ g++ mybitsetsimple.cpp;./a.out
COMPILER VERSION 7.4.0
bitset 32 001001010101
bitset 16 001001010101
bitset 15 111001001010101
testing mybitset 32
testing mybitset 16
testing mybitset 15 111001001010101
testing mybitset 15 111001001010101
testing mybitset size 0
testing mybitset size 0
testing mybitset 0101 size 4
testing mybitset 01010101 size 8
testing mybitset 001001010101 size 12
testing mybitset 111001001010101 size 15
testing mybitset size 0
testing mybitset2 16
testing mybitset2 15 111001001010101
--
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https://bugs.launchpad.net/bugs/1829415
Title:
printing bitset to_string().c_str() in template produces junk
To manage notifications about this bug go to:
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[Bug 1829415] [NEW] printing bitset to_string().c_str() in template produces junk
Public bug reported:
I am trying to print a bitset with printf using a template, but I keep getting
junk on the output.
I can print a bitset with
printf("%s",std::bitset<32>(valuetoprint).to_string().to_cstr());
but I thought it would be nice to do that with a template so I could
just go:
printf("%s",mybitset<32>(valuetoprint));
template const char * mybitset(mytype myobj){
return std::bitset(myobj).to_string().c_str(); }
template const char * mybitset2(int myobj){ return
std::bitset(myobj).to_string().c_str(); }
template const char * mybitset3(int myobj){ return
std::bitset(myobj).template
to_string,std::allocator>().c_str(); }
template const char * mybitset4(int myobj){ return
std::bitset(myobj).template
to_string,std::allocator>().c_str();
}
template std::string mybitset5(int myobj){ return
std::bitset(myobj).template
to_string,std::allocator>(); }
printf("testing bitset32 %s "
,std::bitset<32>(0x255+0xf000).to_string().c_str());
printf("testing bitset16 %s "
,std::bitset<16>(0x255+0xf000).to_string().c_str());
printf("testing mybitset32 %s " ,mybitset<32,int>(0x255+0xf000));
printf("testing mybitset8 %s ",mybitset<8,int>(0x255+0xf000));
printf("testing mybitset2 16 %s " ,mybitset2<16>(0x255+0xf000));
printf("testing mybitset2 15 %s " ,mybitset2<15>(0x255+0xf000));
printf("testing mybitset2 8 %s " ,mybitset2<8>(0x255+0xf000));
printf("testing mybitset2 16 %s " ,mybitset2<16>(0x255+0xf000));
printf("testing mybitset3 15 %s " ,mybitset3<15>(0x255+0xf000));
printf("testing mybitset3 8 %s " ,mybitset3<8>(0x255+0xf000));
printf("testing mybitset3 16 %s \n",mybitset3<16>(0x255+0xf000));
printf("testing mybitset4 16 %s \n",mybitset4<16>(0x255+0xf000));
std::cout << "mybitset5" << mybitset5<16>(0x255+0xf000) << "\n";
and the output I get is:
testing bitset32 001001010101 testing bitset16
001001010101 testing mybitset32 `w�3V testing mybitset8 01010101
testing mybitset2 16 `w�3V testing mybitset2 15 111001001010101 testing
mybitset2 8 01010101 testing mybitset2 16 `w�3V testing mybitset3 15
111001001010101 testing mybitset3 8 01010101 testing mybitset3 16 `w�3V
testing mybitset4 16 `w�3V
mybitset5001001010101
So my template works fine up until I try to make it print a bitset of
size 16. It works fine for a bitset of size 15 but not for 16.
I also tried this compiling with clang and it did the same thing,
outputting garbage, working fine for a template with bitset size 15 and
garbage for 16.
** Affects: gcc-7 (Ubuntu)
Importance: Undecided
Status: New
--
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https://bugs.launchpad.net/bugs/1829415
Title:
printing bitset to_string().c_str() in template produces junk
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