Dear Maintainer, from the segfault and also the code line this may be a duplicate of #926212.
At least the crash points to the same source line: src/shell-app.c, line 1485. Kind regards, Bernhard #926212 https://bugs.debian.org/926212
# Buster amd64 qemu VM 2019-04-19 apt update apt dist-upgrade apt install dpkg-dev devscripts systemd-coredump bc xserver-xorg dbus-x11 gdm3 gnome gdb elfutils binutils gnome-shell-dbgsym systemctl start gdm3 ################ # From submitter [20044.478027] gnome-shell[19403]: segfault at 0 ip 00007f2bca1d03bf sp 00007ffcdcc37660 error 4 in libgnome-shell.so[7f2bca1c8000+1f000] [20044.478034] Code: f7 86 ff ff 48 8b 78 20 48 89 c3 48 c7 40 20 00 00 00 00 48 85 ff 74 1a e8 46 bb ff ff eb 13 0f 1f 40 00 48 8b 42 08 48 89 df <48> 8b 30 e8 d9 82 ff ff 48 8b 53 28 48 85 d2 75 e8 8b 43 1c 85 c0 https://www.enodev.fr/posts/decode-segfault-errors-in-dmesg.html https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/x86/mm/fault.c?h=linux-4.9.y#n31 /* * Page fault error code bits: * * bit 0 ==<-> 0: no page found<----->1: protection fault * bit 1 ==<-> 0: read access><------>1: write access * bit 2 ==<-> 0: kernel-mode access<>1: user-mode access * bit 3 ==<-><------><------><------>1: use of reserved bit detected * bit 4 ==<-><------><------><------>1: fault was an instruction fetch * bit 5 ==<-><------><------><------>1: protection keys block access */ enum x86_pf_error_code { <------>PF_PROT><------>=<-----><------>1 << 0, <------>PF_WRITE<------>=<-----><------>1 << 1, <------>PF_USER><------>=<-----><------>1 << 2, <------>PF_RSVD><------>=<-----><------>1 << 3, <------>PF_INSTR<------>=<-----><------>1 << 4, <------>PF_PK<-><------>=<-----><------>1 << 5, }; "error 4" == 0b100 bit 0 ==<------> 0: no page found bit 1 ==<------> 0: read access bit 2 ==<------> 1: user-mode access ################ # From submitter [20044.478027] gnome-shell[19403]: segfault at 0 ip 00007f2bca1d03bf sp 00007ffcdcc37660 error 4 in libgnome-shell.so[7f2bca1c8000+1f000] [20044.478034] Code: f7 86 ff ff 48 8b 78 20 48 89 c3 48 c7 40 20 00 00 00 00 48 85 ff 74 1a e8 46 bb ff ff eb 13 0f 1f 40 00 48 8b 42 08 48 89 df <48> 8b 30 e8 d9 82 ff ff 48 8b 53 28 48 85 d2 75 e8 8b 43 1c 85 c0 crash instruction - start .init == diff 0x00007f2bca1d03bf - 0x7f2bca1c8000 == 0x83BF benutzer@debian:~$ gdb -q -ex 'set width 0' -ex 'set pagination off' -ex 'info share' -ex 'info target' -ex 'detach' -ex 'quit' --pid $(pidof gnome-shell) 2>&1 | grep libgnome-shell.so 0x00007f956bd67f10 0x00007f956bd8222e Yes /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bd4d238 - 0x00007f956bd4d25c is .note.gnu.build-id in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bd4d260 - 0x00007f956bd4e004 is .gnu.hash in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bd4e008 - 0x00007f956bd54d40 is .dynsym in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bd54d40 - 0x00007f956bd5c075 is .dynstr in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bd5c076 - 0x00007f956bd5c990 is .gnu.version in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bd5c990 - 0x00007f956bd5ca50 is .gnu.version_r in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bd5ca50 - 0x00007f956bd5d7d0 is .rela.dyn in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bd5d7d0 - 0x00007f956bd635c0 is .rela.plt in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bd64000 - 0x00007f956bd64017 is .init in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bd64020 - 0x00007f956bd67ed0 is .plt in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bd67ed0 - 0x00007f956bd67f08 is .plt.got in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bd67f10 - 0x00007f956bd8222e is .text in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bd82230 - 0x00007f956bd82239 is .fini in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bd83000 - 0x00007f956bd87b29 is .rodata in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bd87b30 - 0x00007f956bf897d8 is .gresource.shell_js_resources in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bf897d8 - 0x00007f956bf8ac94 is .eh_frame_hdr in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bf8ac98 - 0x00007f956bf92908 is .eh_frame in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bf94200 - 0x00007f956bf94210 is .init_array in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bf94210 - 0x00007f956bf94220 is .fini_array in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bf94220 - 0x00007f956bf94bf0 is .data.rel.ro in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bf94bf0 - 0x00007f956bf94fa0 is .dynamic in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bf94fa0 - 0x00007f956bf96fe8 is .got in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bf97000 - 0x00007f956bf970e0 is .data in /usr/lib/gnome-shell/libgnome-shell.so 0x00007f956bf970e0 - 0x00007f956bf974b8 is .bss in /usr/lib/gnome-shell/libgnome-shell.so current start .init + diff == current ip 0x00007f956bd64000 + 0x83BF == 0x7F956BD6C3BF benutzer@debian:~$ gdb -q -ex 'set width 0' -ex 'set pagination off' -ex 'disassemble 0x00007f956bd67f10,0x00007f956bd8222e' -ex 'b *0x7F956BD6C3BF' -ex 'detach' -ex 'quit' --pid $(pidof gnome-shell) 2>&1 | grep -i "7F956BD6C3BF" 0x00007f956bd6c3bf <shell_app_dispose+63>: mov (%rax),%rsi Breakpoint 1 at 0x7f956bd6c3bf: file ../src/shell-app.c, line 1485. ############# # From submitter [20044.478027] gnome-shell[19403]: segfault at 0 ip 00007f2bca1d03bf sp 00007ffcdcc37660 error 4 in libgnome-shell.so[7f2bca1c8000+1f000] [20044.478034] Code: f7 86 ff ff 48 8b 78 20 48 89 c3 48 c7 40 20 00 00 00 00 48 85 ff 74 1a e8 46 bb ff ff eb 13 0f 1f 40 00 48 8b 42 08 48 89 df <48> 8b 30 e8 d9 82 ff ff 48 8b 53 28 48 85 d2 75 e8 8b 43 1c 85 c0 -> 42 bytes before the crashing instruction -> 22 bytes the crashing instruction and following benutzer@debian:~$ gdb -q --pid $(pidof gnome-shell) Attaching to process 4180 [New LWP 4182] ... [New LWP 4249] [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". 0x00007f956ad8bb69 in __GI___poll (fds=0x55749da60010, nfds=15, timeout=84207) at ../sysdeps/unix/sysv/linux/poll.c:29 29 ../sysdeps/unix/sysv/linux/poll.c: Datei oder Verzeichnis nicht gefunden. (gdb) find /b 0x00007f956bd4d238, 0x00007f956bf974b8, 0xf7, 0x86, 0xff, 0xff, 0x48, 0x8b, 0x78, 0x20, 0x48, 0x89, 0xc3, 0x48, 0xc7, 0x40, 0x20, 0x00, 0x00, 0x00, 0x00, 0x48, 0x85, 0xff, 0x74, 0x1a, 0xe8, 0x46, 0xbb, 0xff, 0xff, 0xeb, 0x13, 0x0f, 0x1f, 0x40, 0x00, 0x48, 0x8b, 0x42, 0x08, 0x48, 0x89, 0xdf, 0x48, 0x8b, 0x30, 0xe8, 0xd9, 0x82, 0xff, 0xff, 0x48, 0x8b, 0x53, 0x28, 0x48, 0x85, 0xd2, 0x75, 0xe8, 0x8b, 0x43, 0x1c, 0x85, 0xc0 0x7f956bd6c395 <shell_app_dispose+21> 1 pattern found. (gdb) disassemble 0x7f956bd6c395,0x7f956bd6c395+64 Dump of assembler code from 0x7f956bd6c395 to 0x7f956bd6c3d5: 0x00007f956bd6c395 <shell_app_dispose+21>: testl $0x89482078,-0x74b70001(%rsi) 0x00007f956bd6c39f <shell_app_dispose+31>: retq 0x00007f956bd6c3a0 <shell_app_dispose+32>: movq $0x0,0x20(%rax) 0x00007f956bd6c3a8 <shell_app_dispose+40>: test %rdi,%rdi 0x00007f956bd6c3ab <shell_app_dispose+43>: je 0x7f956bd6c3c7 <shell_app_dispose+71> 0x00007f956bd6c3ad <shell_app_dispose+45>: callq 0x7f956bd67ef8 <g_object_unref@plt> 0x00007f956bd6c3b2 <shell_app_dispose+50>: jmp 0x7f956bd6c3c7 <shell_app_dispose+71> 0x00007f956bd6c3b4 <shell_app_dispose+52>: nopl 0x0(%rax) 0x00007f956bd6c3b8 <shell_app_dispose+56>: mov 0x8(%rdx),%rax 0x00007f956bd6c3bc <shell_app_dispose+60>: mov %rbx,%rdi 0x00007f956bd6c3bf <shell_app_dispose+63>: mov (%rax),%rsi 0x00007f956bd6c3c2 <shell_app_dispose+66>: callq 0x7f956bd646a0 <_shell_app_remove_window@plt> 0x00007f956bd6c3c7 <shell_app_dispose+71>: mov 0x28(%rbx),%rdx 0x00007f956bd6c3cb <shell_app_dispose+75>: test %rdx,%rdx 0x00007f956bd6c3ce <shell_app_dispose+78>: jne 0x7f956bd6c3b8 <shell_app_dispose+56> 0x00007f956bd6c3d0 <shell_app_dispose+80>: mov 0x1c(%rbx),%eax 0x00007f956bd6c3d3 <shell_app_dispose+83>: test %eax,%eax End of assembler dump. (gdb) b *(0x7f956bd6c395+42) Breakpoint 1 at 0x7f956bd6c3bf: file ../src/shell-app.c, line 1485. ######### Duplicate of 926212 ?