# gdb ../sbin/nginx core
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Reading symbols from ../sbin/nginx...

warning: Can't open file /dev/zero (deleted) during file-backed mapping note processing
[New LWP 95634]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `nginx: worker process                                       '.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  ngx_http_core_access_phase (r=0x560e39e40880, ph=0x560e39e541e8) at src/http/ngx_http_core_module.c:1127
1127	                h->hash = 0;
(gdb) backtrace full
#0  ngx_http_core_access_phase (r=0x560e39e40880, ph=0x560e39e541e8) at src/http/ngx_http_core_module.c:1127
        rc = 0
        h = 0x4e13f3427c687526
        clcf = <optimized out>
#1  0x0000560e391ebebc in ngx_http_core_run_phases (r=r@entry=0x560e39e40880) at src/http/ngx_http_core_module.c:875
        rc = <optimized out>
        ph = 0x560e39e54140
        cmcf = <optimized out>
#2  0x0000560e391ebf5f in ngx_http_handler (r=r@entry=0x560e39e40880) at src/http/ngx_http_core_module.c:858
        cmcf = <optimized out>
#3  0x0000560e391f654a in ngx_http_process_request (r=r@entry=0x560e39e40880) at src/http/ngx_http_request.c:2104
        c = 0x560e39e3f920
#4  0x0000560e392254ae in ngx_http_v2_run_request (r=0x560e39e40880) at src/http/v2/ngx_http_v2.c:3982
        fc = 0x560e39e3f920
        h2c = <optimized out>
#5  0x0000560e392255d9 in ngx_http_v2_state_header_complete (h2c=h2c@entry=0x560e39ce72c0, pos=pos@entry=0x560e39ec57e6 "", end=end@entry=0x560e39ec5997 "") at src/http/v2/ngx_http_v2.c:1914
        stream = <optimized out>
#6  0x0000560e39225a3b in ngx_http_v2_state_process_header (h2c=h2c@entry=0x560e39ce72c0, pos=0x560e39ec57e6 "", end=end@entry=0x560e39ec5997 "") at src/http/v2/ngx_http_v2.c:1878
        len = <optimized out>
        rc = <optimized out>
        h = <optimized out>
        fc = 0x560e39e3f920
        hh = <optimized out>
        r = 0x560e39e40880
        header = 0x560e39ce7360
        cscf = <optimized out>
        cmcf = <optimized out>
        cookie = <optimized out>
#7  0x0000560e392260c4 in ngx_http_v2_state_field_huff (h2c=h2c@entry=0x560e39ce72c0, pos=0x560e39ec57e6 "", end=end@entry=0x560e39ec5997 "") at src/http/v2/ngx_http_v2.c:1619
        size = 28
#8  0x0000560e3922631f in ngx_http_v2_state_field_len (h2c=h2c@entry=0x560e39ce72c0, pos=<optimized out>, end=end@entry=0x560e39ec5997 "") at src/http/v2/ngx_http_v2.c:1577
        alloc = <optimized out>
        len = <optimized out>
        huff = 1
        cscf = <optimized out>
#9  0x0000560e3922656b in ngx_http_v2_state_header_block (h2c=0x560e39ce72c0, pos=<optimized out>, end=0x560e39ec5997 "") at src/http/v2/ngx_http_v2.c:1493
        ch = <optimized out>
        value = <optimized out>
        indexed = 0
        size_update = 0
        prefix = <optimized out>
#10 0x0000560e392241c8 in ngx_http_v2_read_handler (rev=rev@entry=0x560e39e95860) at src/http/v2/ngx_http_v2.c:435
        p = 0x560e39ec57c8 "`\234\327\217^\354\033\267d\277\003\335\255\244b\236s\366d\223LYi\242\244\325GA\327\037"
        end = 0x560e39ec5997 ""
        available = <optimized out>
        n = 855
        c = 0x560e39e57be0
        h2mcf = <optimized out>
        h2c = 0x560e39ce72c0
#11 0x0000560e3922479c in ngx_http_v2_idle_handler (rev=0x560e39e95860) at src/http/v2/ngx_http_v2.c:4862
        c = 0x560e39e57be0
        h2scf = <optimized out>
        h2c = 0x560e39ce72c0
        clcf = <optimized out>
#12 0x0000560e391cac7c in ngx_epoll_process_events (cycle=<optimized out>, timer=<optimized out>, flags=1) at src/event/modules/ngx_epoll_module.c:901
        events = 1
        revents = 1
        instance = 0
        i = 0
        level = <optimized out>
        err = <optimized out>
        rev = <optimized out>
        wev = <optimized out>
        queue = <optimized out>
        c = 0x560e39e57be0
#13 0x0000560e391c16e3 in ngx_process_events_and_timers (cycle=cycle@entry=0x560e39d00fb0) at src/event/ngx_event.c:248
        flags = 1
--Type <RET> for more, q to quit, c to continue without paging--c
        timer = 59982
        delta = 5626107826396493094
#14 0x0000560e391c913f in ngx_worker_process_cycle (cycle=0x560e39d00fb0, data=<optimized out>) at src/os/unix/ngx_process_cycle.c:721
        worker = <optimized out>
#15 0x0000560e391c78a4 in ngx_spawn_process (cycle=cycle@entry=0x560e39d00fb0, proc=0x560e391c9059 <ngx_worker_process_cycle>, data=0x3, name=0x560e392714ef "worker process", respawn=respawn@entry=3)
    at src/os/unix/ngx_process.c:199
        on = 1
        pid = 0
        s = <optimized out>
#16 0x0000560e391c9a5a in ngx_reap_children (cycle=0x560e39d00fb0) at src/os/unix/ngx_process_cycle.c:598
        i = <optimized out>
        live = 1
        n = <optimized out>
        ch = {command = 2, pid = 93570, slot = 3, fd = -1}
        ccf = <optimized out>
        i = <optimized out>
        n = <optimized out>
        live = <optimized out>
        ch = <optimized out>
        ccf = <optimized out>
#17 ngx_master_process_cycle (cycle=cycle@entry=0x560e39d00fb0) at src/os/unix/ngx_process_cycle.c:174
        title = <optimized out>
        p = <optimized out>
        size = <optimized out>
        i = <optimized out>
        sigio = 0
        set = {__val = {0 <repeats 13 times>, 6, 0, 94619099467720}}
        itv = {it_interval = {tv_sec = 0, tv_usec = 0}, it_value = {tv_sec = 0, tv_usec = 0}}
        live = <optimized out>
        delay = 0
        ccf = 0x560e39d02f50
#18 0x0000560e391a230e in main (argc=<optimized out>, argv=<optimized out>) at src/core/nginx.c:383
        b = <optimized out>
        log = <optimized out>
        i = <optimized out>
        cycle = 0x560e39d00fb0
        init_cycle = {conf_ctx = 0x0, pool = 0x560e39d002a0, log = 0x560e392bebe0 <ngx_log>, new_log = {log_level = 0, file = 0x0, connection = 0, disk_full_time = 0, handler = 0x0, data = 0x0, writer = 0x0, 
            wdata = 0x0, action = 0x0, next = 0x0}, log_use_stderr = 0, files = 0x0, free_connections = 0x0, free_connection_n = 0, modules = 0x0, modules_n = 0, modules_used = 0, reusable_connections_queue = {
            prev = 0x0, next = 0x0}, reusable_connections_n = 0, connections_reuse_time = 0, listening = {elts = 0x0, nelts = 0, size = 0, nalloc = 0, pool = 0x0}, paths = {elts = 0x0, nelts = 0, size = 0, 
            nalloc = 0, pool = 0x0}, config_dump = {elts = 0x0, nelts = 0, size = 0, nalloc = 0, pool = 0x0}, config_dump_rbtree = {root = 0x0, sentinel = 0x0, insert = 0x0}, config_dump_sentinel = {key = 0, 
            left = 0x0, right = 0x0, parent = 0x0, color = 0 '\000', data = 0 '\000'}, open_files = {last = 0x0, part = {elts = 0x0, nelts = 0, next = 0x0}, size = 0, nalloc = 0, pool = 0x0}, shared_memory = {
            last = 0x0, part = {elts = 0x0, nelts = 0, next = 0x0}, size = 0, nalloc = 0, pool = 0x0}, connection_n = 0, files_n = 0, connections = 0x0, read_events = 0x0, write_events = 0x0, old_cycle = 0x0, 
          conf_file = {len = 32, data = 0x560e39d002f0 "/secure/viewqwest.css"}, conf_param = {len = 29, data = 0x7ffc56ecfee4 ""}, conf_prefix = {len = 22, data = 0x560e39d002f0 "/secure/viewqwest.css"}, prefix = {
            len = 17, data = 0x560e3926d13c "/usr/local/nginx/"}, error_log = {len = 14, data = 0x560e3926d15e "logs/error.log"}, lock_file = {len = 0, data = 0x0}, hostname = {len = 0, data = 0x0}}
        cd = <optimized out>
        ccf = 0x560e39d02f50
(gdb)