On a CentOS 4.4 system on a x86_64, using bash 3.0 (Redhat's bash-3.0-19.3 package), bash coredumped when the stack filled up. Looks like signals being received from within a signal handler to me. This happened after someone hit ctrl-c many times while tail -f'ing a log file that was being written to at an insane rate.
Below is the stack trace from when their login bash shell coredumped. I have never seen bash coredump on these systems (hundreds of HP DL360 G5's running CentOS 4.4 with kernel 2.6.9-67). This system, however, is running Linux kernel 2.6.25.3. I wanted to deploy this kernel to a few more systems, therefore my concern that I have uncovered a kernel bug, or a change in signal handling behavior that will confuse bash or other processes. # rpm -q bash bash-3.0-19.3.x86_64 # uname -r 2.6.25.3 Core was generated by `-bash'. Program terminated with signal 11, Segmentation fault. [...] #0 0x0000003fd4a76200 in mbrtowc () from /lib64/tls/libc.so.6 (gdb) bt #0 0x0000003fd4a76200 in mbrtowc () from /lib64/tls/libc.so.6 #1 0x0000000000473888 in rl_redisplay () #2 0x0000000000471968 in rl_clear_message () #3 0x0000000000474505 in rl_free_line_state () #4 0x00000000004745c1 in rl_free_line_state () #5 <signal handler called> #6 0x0000003fd4a2e743 in sigprocmask () from /lib64/tls/libc.so.6 #7 0x0000000000474582 in rl_free_line_state () #8 <signal handler called> #9 0x0000003fd4a2e743 in sigprocmask () from /lib64/tls/libc.so.6 #10 0x0000000000474582 in rl_free_line_state () #11 <signal handler called> #12 0x0000003fd4a2e743 in sigprocmask () from /lib64/tls/libc.so.6 #13 0x0000000000474582 in rl_free_line_state () [...repeat many times...] #33417 0x0000003fd4a2e743 in sigprocmask () from /lib64/tls/libc.so.6 #33418 0x0000000000474582 in rl_free_line_state () #33419 <signal handler called> #33420 0x0000003fd4a2e743 in sigprocmask () from /lib64/tls/libc.so.6 #33421 0x0000000000474582 in rl_free_line_state () #33422 <signal handler called> #33423 0x0000003fd4a2e5ed in sigaction () from /lib64/tls/libc.so.6 #33424 0x000000000047417d in _rl_current_display_line () #33425 0x000000000047421c in _rl_current_display_line () #33426 0x00000000004742dc in rl_set_signals () #33427 0x0000000000466e75 in readline () #33428 0x000000000041a3ea in yy_input_name () #33429 0x000000000041c1c5 in execute_prompt_command () #33430 0x000000000041d291 in execute_prompt_command () #33431 0x000000000041fd0d in yyparse () #33432 0x0000000000419e42 in parse_command () #33433 0x0000000000419ee8 in read_command () #33434 0x000000000041a05d in reader_loop () #33435 0x00000000004192a0 in main () Also seen in syslog: kernel: bash[9443]: segfault at 7ffff65ddff8 ip 3fd4a76200 sp7ffff65ddfe0 error 6 in libc-2.3.4.so[3fd4a00000+12b000] kernel: bash used greatest stack depth: 3096 bytes left
