[Bug 254309] [tcp] frequent panics in tcp_output

Mon Mar 15 15:41:58 UTC 2021

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254309

            Bug ID: 254309
           Summary: [tcp] frequent panics in tcp_output
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: rozhuk.im at gmail.com

__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
55              __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct
pcpu,
(kgdb) #0  __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
#1  doadump (textdump=<optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:399
#2  0xffffffff805ee215 in kern_reboot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:486
#3  0xffffffff805ee680 in vpanic (fmt=<optimized out>, ap=<optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:919
#4  0xffffffff805ee483 in panic (fmt=<unavailable>)
    at /usr/src/sys/kern/kern_shutdown.c:843
#5  0xffffffff808e58f7 in trap_fatal (frame=0xfffffe01140f6540, eva=24)
    at /usr/src/sys/amd64/amd64/trap.c:915
#6  0xffffffff808e594f in trap_pfault (frame=frame at entry=0xfffffe01140f6540,
    usermode=false, signo=<optimized out>, signo at entry=0x0,
    ucode=<optimized out>, ucode at entry=0x0)
    at /usr/src/sys/amd64/amd64/trap.c:732
#7  0xffffffff808e5116 in trap (frame=0xfffffe01140f6540)
    at /usr/src/sys/amd64/amd64/trap.c:398
#8  <signal handler called>
#9  m_copydata (m=0x0, m at entry=0xfffff80576236400, off=0, len=1,
    cp=<optimized out>) at /usr/src/sys/kern/uipc_mbuf.c:656
#10 0xffffffff8076eb5a in tcp_output (tp=0xfffffe0169d87ca8)
    at /usr/src/sys/netinet/tcp_output.c:1068
#11 0xffffffff80765fbb in tcp_do_segment (m=<optimized out>,
    th=<optimized out>, so=0xfffff802a3cb03b0, tp=0xfffffe0169d87ca8,
    drop_hdrlen=52, tlen=<optimized out>, iptos=0 '\000')
    at /usr/src/sys/netinet/tcp_input.c:2817
#12 0xffffffff80763588 in tcp_input (mp=<optimized out>,
    offp=<optimized out>, proto=<optimized out>)
    at /usr/src/sys/netinet/tcp_input.c:1135
#13 0xffffffff80757912 in ip_input (m=0x0)
    at /usr/src/sys/netinet/ip_input.c:833
#14 0xffffffff8072c318 in netisr_process_workstream_proto (
    nwsp=<optimized out>, proto=1) at /usr/src/sys/net/netisr.c:919
#15 swi_net (arg=<optimized out>) at /usr/src/sys/net/netisr.c:966
#16 0xffffffff805bb045 in intr_event_execute_handlers (p=<optimized out>,
    ie=0xfffff800029d6500) at /usr/src/sys/kern/kern_intr.c:1168
#17 ithread_execute_handlers (p=<optimized out>, ie=0xfffff800029d6500)
    at /usr/src/sys/kern/kern_intr.c:1181
#18 ithread_loop (arg=0xfffff80002a05020)
    at /usr/src/sys/kern/kern_intr.c:1269
#19 0xffffffff805b7c77 in fork_exit (
    callout=0xffffffff805bad30 <ithread_loop>, arg=0xfffff80002a05020,
    frame=0xfffffe01140f6c00) at /usr/src/sys/kern/kern_fork.c:1069
#20 <signal handler called>


__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
55              __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct
pcpu,
(kgdb) #0  __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
#1  doadump (textdump=<optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:399
#2  0xffffffff805ee6a5 in kern_reboot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:486
#3  0xffffffff805eeb10 in vpanic (fmt=<optimized out>, ap=<optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:919
#4  0xffffffff805ee913 in panic (fmt=<unavailable>)
    at /usr/src/sys/kern/kern_shutdown.c:843
#5  0xffffffff808e5d57 in trap_fatal (frame=0xfffffe0113ba9540, eva=80)
    at /usr/src/sys/amd64/amd64/trap.c:915
#6  0xffffffff808e5daf in trap_pfault (frame=frame at entry=0xfffffe0113ba9540,
    usermode=false, signo=<optimized out>, signo at entry=0x0,
    ucode=<optimized out>, ucode at entry=0x0)
    at /usr/src/sys/amd64/amd64/trap.c:732
#7  0xffffffff808e5576 in trap (frame=0xfffffe0113ba9540)
    at /usr/src/sys/amd64/amd64/trap.c:398
#8  <signal handler called>
#9  0xffffffff80650d6c in turnstile_wait (ts=0xfffff8000229c780,
    owner=<optimized out>, queue=queue at entry=0)
    at /usr/src/sys/kern/subr_turnstile.c:794
#10 0xffffffff805d5d75 in __mtx_lock_sleep (c=0xfffff80004cf5618,
    v=<optimized out>) at /usr/src/sys/kern/kern_mutex.c:664
#11 0xffffffff80771f9a in tcp_hpts_thread (ctx=0xfffff80004cf5600)
    at /usr/src/sys/netinet/tcp_hpts.c:1816
#12 0xffffffff80609166 in softclock_call_cc (c=0xfffff80004cf56c0,
    cc=cc at entry=0xffffffff80c6bd40 <cc_cpu+4800>, direct=direct at entry=1)
    at /usr/src/sys/kern/kern_timeout.c:696
#13 0xffffffff80608f3f in callout_process (now=now at entry=8227146370453)
    at /usr/src/sys/kern/kern_timeout.c:479
#14 0xffffffff80590355 in handleevents (now=8227146370453, fake=fake at entry=0)
    at /usr/src/sys/kern/kern_clocksource.c:213
#15 0xffffffff8059011c in hardclockintr ()
    at /usr/src/sys/kern/kern_clocksource.c:148
#16 0xffffffff808b78a1 in ipi_bitmap_handler (frame=...)
    at /usr/src/sys/x86/x86/mp_x86.c:1318
#17 <signal handler called>
#18 acpi_cpu_c1 () at /usr/src/sys/x86/x86/cpu_machdep.c:211
#19 0xffffffff804180cb in acpi_cpu_idle (sbt=<optimized out>)
    at /usr/src/sys/dev/acpica/acpi_cpu.c:1185
#20 0xffffffff808acde1 in cpu_idle_acpi (sbt=0)
    at /usr/src/sys/x86/x86/cpu_machdep.c:509
#21 0xffffffff808ace97 in cpu_idle (busy=0)
    at /usr/src/sys/x86/x86/cpu_machdep.c:629
#22 0xffffffff8061fcb4 in sched_idletd (dummy=<optimized out>)
    at /usr/src/sys/kern/sched_ule.c:2874
#23 0xffffffff805b7c77 in fork_exit (
    callout=0xffffffff8061f920 <sched_idletd>, arg=0x0,
    frame=0xfffffe0113ba9c00) at /usr/src/sys/kern/kern_fork.c:1069
#24 <signal handler called>

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