panic(ffffffff82210322) at panic+0x15c sys/kern/subr_prf.c:207 tcp_output(ffff800000a0b540) at tcp_output+0x2c4b tcp_setpersist sys/netinet/tcp_output.c:1130 [inline] tcp_output(ffff800000a0b540) at tcp_output+0x2c4b sys/netinet/tcp_output.c:333 tcp_usrreq(fffffd806eb31648,9,fffffd806f305300,0,0,ffff800020ed1d50) at tcp_usrreq+0xa55 sosend(fffffd806eb31648,0,ffff800020e8d0f8,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:549 dofilewritev(ffff800020ed1d50,4,ffff800020e8d0f8,0,ffff800020e8d1e0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020ed1d50,ffff800020e8d190,ffff800020e8d1e0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e8d260) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e8d260) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc6b50, count: 6 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic tcp_output: template len != hdrlen - optlen ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82210322) at panic+0x15c sys/kern/subr_prf.c:207 tcp_output(ffff800000a0b540) at tcp_output+0x2c4b tcp_setpersist sys/netinet/tcp_output.c:1130 [inline] tcp_output(ffff800000a0b540) at tcp_output+0x2c4b sys/netinet/tcp_output.c:333 tcp_usrreq(fffffd806eb31648,9,fffffd806f305300,0,0,ffff800020ed1d50) at tcp_usrreq+0xa55 sosend(fffffd806eb31648,0,ffff800020e8d0f8,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:549 dofilewritev(ffff800020ed1d50,4,ffff800020e8d0f8,0,ffff800020e8d1e0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020ed1d50,ffff800020e8d190,ffff800020e8d1e0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e8d260) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e8d260) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc6b50, count: -9 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020e8cc60 rbx 0xffff800020e8cd10 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff811b7d2f kprintf+0x16f r9 0x1 r10 0x2 r11 0xc13dd85238287b73 r12 0x3000000008 r13 0xffff800020e8cc70 r14 0x100 r15 0x1 rip 0xffffffff81e2d538 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020e8cc50 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (sshd) pid=413599 stat=onproc flags process=12 proc=0 pri=24, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020ed04f0,0xffff800020ed0020 process=0xffff800020ec9350 user=0xffff800020e88000, vmspace=0xfffffd806e943008 estcpu=1, cpticks=1, pctcpu=0.1 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 44419 352060 0 0 3 0x14200 bored sosplice 89466 13643 15472 0 3 0x82 nanosleep syz-executor.1 9025 355447 15472 0 7 0x2 syz-executor.0 15472 347049 81968 0 3 0x82 thrsleep syz-fuzzer 15472 503460 81968 0 3 0x4000082 nanosleep syz-fuzzer 15472 465340 81968 0 3 0x4000082 thrsleep syz-fuzzer 15472 433774 81968 0 3 0x4000082 thrsleep syz-fuzzer 15472 199194 81968 0 3 0x4000082 thrsleep syz-fuzzer 15472 15443 81968 0 3 0x4000082 thrsleep syz-fuzzer 15472 292188 81968 0 3 0x4000082 nanosleep syz-fuzzer 15472 486081 81968 0 3 0x4000082 thrsleep syz-fuzzer 15472 489091 81968 0 3 0x4000082 thrsleep syz-fuzzer 15472 166116 81968 0 3 0x4000082 kqread syz-fuzzer 15472 260241 81968 0 3 0x4000082 thrsleep syz-fuzzer 81968 32776 44886 0 3 0x10008a pause ksh *44886 413599 76961 0 7 0x12 sshd 95866 473490 1 0 3 0x100083 ttyin getty 76961 199439 1 0 3 0x80 select sshd 9642 332711 96453 74 3 0x100092 bpf pflogd 96453 502588 1 0 3 0x80 netio pflogd 11053 358579 19772 73 3 0x100090 kqread syslogd 19772 304110 1 0 3 0x100082 netio syslogd 79890 185147 1 77 3 0x100090 poll dhclient 39562 5501 1 0 3 0x80 poll dhclient 2072 485660 0 0 3 0x14200 bored smr 80591 189063 0 0 3 0x14200 pgzero zerothread 31836 361505 0 0 3 0x14200 aiodoned aiodoned 58293 443513 0 0 3 0x14200 syncer update 46369 432723 0 0 3 0x14200 cleaner cleaner 79801 208583 0 0 3 0x14200 reaper reaper 61193 414042 0 0 3 0x14200 pgdaemon pagedaemon 92982 83428 0 0 3 0x14200 bored crynlk 98420 285963 0 0 3 0x14200 bored crypto 57418 200849 0 0 3 0x40014200 acpi0 acpi0 5697 135430 0 0 3 0x40014200 idle1 21595 287931 0 0 3 0x14200 bored softnet 77166 112272 0 0 3 0x14200 bored systqmp 79610 174207 0 0 3 0x14200 bored systq 65295 422309 0 0 3 0x40014200 bored softclock 4532 171123 0 0 3 0x40014200 idle0 1 259805 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 9025 (syz-executor.0) thread 0xffff800020e6d868 (355447) exclusive rrwlock inode r = 0 (0xfffffd806858fd60) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:311 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:575 #5 vget+0x1c8 sys/kern/vfs_subr.c:671 #6 ufs_ihashget+0x141 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x74 sys/ufs/ffs/ffs_vfsops.c:1329 #8 ufs_lookup+0x14b7 sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90 #10 vfs_lookup+0x7a6 sys/kern/vfs_lookup.c:568 #11 namei+0x63c sys/kern/vfs_lookup.c:249 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1853 #13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b33b6f8) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:311 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:575 #5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419 #6 namei+0x63c sys/kern/vfs_lookup.c:249 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1853 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #9 Xsyscall+0x128 Process 44886 (sshd) thread 0xffff800020ed1d50 (413599) exclusive rwlock netlock r = 0 (0xffffffff824efd38) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sosend+0x559 sys/kern/uipc_socket.c:537 #3 dofilewritev+0x1b6 sys/kern/sys_generic.c:365 #4 sys_write+0x83 sys/kern/sys_generic.c:285 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #6 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9505 6412K 6733K 78643K 10794 0 pcb 13 8K 8K 78643K 59 0 rtable 106 3K 4K 78643K 251 0 ifaddr 63 13K 13K 78643K 91 0 counters 43 33K 34K 78643K 53 0 ioctlops 0 0K 4K 78643K 1481 0 iov 0 0K 12K 78643K 20 0 mount 1 1K 1K 78643K 1 0 vnodes 1226 77K 77K 78643K 1290 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 3 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 23 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 4 9K 25K 78643K 148 0 proc 59 63K 83K 78643K 438 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 17 0 in_multi 40 2K 2K 78643K 61 0 ether_multi 1 0K 0K 78643K 5 0 mrt 0 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 49 228K 228K 78643K 49 0 exec 0 0K 1K 78643K 212 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 117 54K 55K 78643K 1447 0 UVM aobj 6 2K 2K 78643K 6 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 22 0 NDP 10 0K 0K 78643K 20 0 temp 85 3032K 3097K 78643K 3370 0 kqueue 3 4K 16K 78643K 20 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 25 0 23 1 0 1 1 0 8 0 rtentry 112 52 0 9 2 0 2 2 0 8 0 unpcb 120 73 0 63 1 0 1 1 0 8 0 syncache 264 6 0 6 2 2 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 262 0 262 1 1 0 1 0 8 0 tcpcb 544 159 0 155 1 0 1 1 0 8 0 inpcb 280 302 0 295 2 1 1 2 0 8 0 rttmr 72 1 0 1 1 1 0 1 0 8 0 nd6 48 8 0 3 1 0 1 1 0 8 0 ppxss 1128 2 0 2 1 1 0 1 0 8 0 pffrag 232 5 0 5 1 1 0 1 0 482 0 pffrnode 88 5 0 5 1 1 0 1 0 8 0 pffrent 40 12 0 12 1 1 0 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 30 0 3 1 0 1 1 0 8 0 pfstkey 112 30 0 3 1 0 1 1 0 8 0 pfstate 328 30 0 3 3 0 3 3 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 220 0 40 13 0 13 13 0 8 0 art_table 32 222 0 40 2 0 2 2 0 8 0 art_node 16 51 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 21 0 11 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1613 0 207 89 0 89 89 0 8 0 ffsino 272 1613 0 207 95 0 95 95 0 8 0 nchpl 144 1999 0 391 60 0 60 60 0 8 0 uvmvnodes 72 1698 0 0 31 0 31 31 0 8 0 vnodes 208 1698 0 0 90 0 90 90 0 8 0 namei 1024 5336 0 5336 1 0 1 1 0 8 1 percpumem 16 37 0 5 1 0 1 1 0 8 0 vcpupl 1984 3 0 0 1 0 1 1 0 8 0 vmpool 560 3 0 0 1 0 1 1 0 8 0 scxspl 192 5233 0 5233 8 4 4 7 0 8 4 plimitpl 152 19 0 11 1 0 1 1 0 8 0 sigapl 424 364 0 333 4 0 4 4 0 8 0 futexpl 56 1945 0 1945 1 0 1 1 0 8 1 knotepl 112 79 0 60 1 0 1 1 0 8 0 kqueuepl 144 42 0 40 1 0 1 1 0 8 0 pipelkpl 48 91 0 81 1 0 1 1 0 8 0 pipepl 120 182 0 163 1 0 1 1 0 8 0 fdescpl 496 348 0 333 3 0 3 3 0 8 0 filepl 152 1992 0 1892 5 0 5 5 0 8 1 lockfpl 104 29 0 28 1 0 1 1 0 8 0 lockfspl 48 13 0 12 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 22 0 11 1 0 1 1 0 8 0 ucredpl 96 146 0 137 1 0 1 1 0 8 0 zombiepl 144 333 0 332 1 0 1 1 0 8 0 processpl 984 364 0 332 5 0 5 5 0 8 0 procpl 624 656 0 614 4 0 4 4 0 8 0 sosppl 128 2 0 2 1 1 0 1 0 8 0 sockpl 400 400 0 381 3 0 3 3 0 8 1 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 170 0 0 21 0 21 21 0 8 0 mtagpl 80 13 0 0 1 0 1 1 0 8 0 mbufpl 256 185 0 0 12 0 12 12 0 8 0 bufpl 280 3474 0 133 239 0 239 239 0 8 0 anonpl 16 43883 0 29927 58 1 57 57 0 124 0 amapchunkpl 152 1736 0 1608 7 1 6 7 0 158 0 amappl16 192 1359 0 613 38 0 38 38 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 28 0 22 1 0 1 1 0 8 0 amappl13 168 25 0 24 1 0 1 1 0 8 0 amappl12 160 19 0 13 1 0 1 1 0 8 0 amappl11 152 108 0 92 1 0 1 1 0 8 0 amappl10 144 75 0 69 1 0 1 1 0 8 0 amappl9 136 386 0 383 1 0 1 1 0 8 0 amappl8 128 340 0 312 1 0 1 1 0 8 0 amappl7 120 178 0 165 1 0 1 1 0 8 0 amappl6 112 26 0 22 1 0 1 1 0 8 0 amappl5 104 247 0 233 1 0 1 1 0 8 0 amappl4 96 486 0 457 1 0 1 1 0 8 0 amappl3 88 107 0 99 1 0 1 1 0 8 0 amappl2 80 1831 0 1768 2 0 2 2 0 8 0 amappl1 72 17597 0 17172 23 13 10 18 0 8 0 amappl 80 937 0 894 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 64 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 351 0 333 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 351 0 333 1 0 1 1 0 8 0 vmmpekpl 168 6703 0 6673 2 0 2 2 0 8 0 vmmpepl 168 49020 0 47228 109 11 98 105 0 357 14 vmsppl 368 350 0 333 2 0 2 2 0 8 0 pdppl 4096 710 0 669 6 0 6 6 0 8 0 pvpl 32 155593 0 138604 144 0 144 144 0 265 4 pmappl 232 350 0 333 2 0 2 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 259 0 3 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff824fbff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff8265b7f8) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8265b7f8) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff8265b7f8,1) at __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x392 sys/kern/sched_bsd.c:435 sleep_finish(ffff800020f72c40,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020f72c40,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020f72c40,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(fffffd8068eee118,11,ffffffff82257c51,0) at tsleep+0x1cc sys/kern/kern_synch.c:155 biowait(fffffd8068eee118) at biowait+0xa6 sys/kern/vfs_bio.c:1256 bwrite(fffffd8068eee118) at bwrite+0x1e4 sys/kern/vfs_bio.c:765 ufs_dirremove(fffffd8068fa7680,fffffd806858fcc8,800c,1) at ufs_dirremove+0x291 ufs_rmdir(ffff800020f72e68) at ufs_rmdir+0x247 sys/ufs/ufs/ufs_vnops.c:1328 VOP_RMDIR(fffffd8068fa7680,fffffd8064dba0f0,ffff800020f72f68) at VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474 end trace frame: 0xffff800020f73000, count: 0 ddb{0}> trace x86_ipi_db(ffffffff824fbff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff8265b7f8) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8265b7f8) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff8265b7f8,1) at __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x392 sys/kern/sched_bsd.c:435 sleep_finish(ffff800020f72c40,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020f72c40,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020f72c40,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(fffffd8068eee118,11,ffffffff82257c51,0) at tsleep+0x1cc sys/kern/kern_synch.c:155 biowait(fffffd8068eee118) at biowait+0xa6 sys/kern/vfs_bio.c:1256 bwrite(fffffd8068eee118) at bwrite+0x1e4 sys/kern/vfs_bio.c:765 ufs_dirremove(fffffd8068fa7680,fffffd806858fcc8,800c,1) at ufs_dirremove+0x291 ufs_rmdir(ffff800020f72e68) at ufs_rmdir+0x247 sys/ufs/ufs/ufs_vnops.c:1328 VOP_RMDIR(fffffd8068fa7680,fffffd8064dba0f0,ffff800020f72f68) at VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474 dounlinkat(ffff800020e6d868,ffffff9c,7f7ffffe0ca0,8) at dounlinkat+0x14c sys/kern/vfs_syscalls.c:1886 syscall(ffff800020f730e0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020f730e0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe0c90, count: -17 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82210322) at panic+0x15c sys/kern/subr_prf.c:207 tcp_output(ffff800000a0b540) at tcp_output+0x2c4b tcp_setpersist sys/netinet/tcp_output.c:1130 [inline] tcp_output(ffff800000a0b540) at tcp_output+0x2c4b sys/netinet/tcp_output.c:333 tcp_usrreq(fffffd806eb31648,9,fffffd806f305300,0,0,ffff800020ed1d50) at tcp_usrreq+0xa55 sosend(fffffd806eb31648,0,ffff800020e8d0f8,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:549 dofilewritev(ffff800020ed1d50,4,ffff800020e8d0f8,0,ffff800020e8d1e0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020ed1d50,ffff800020e8d190,ffff800020e8d1e0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e8d260) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e8d260) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc6b50, count: 6 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82210322) at panic+0x15c sys/kern/subr_prf.c:207 tcp_output(ffff800000a0b540) at tcp_output+0x2c4b tcp_setpersist sys/netinet/tcp_output.c:1130 [inline] tcp_output(ffff800000a0b540) at tcp_output+0x2c4b sys/netinet/tcp_output.c:333 tcp_usrreq(fffffd806eb31648,9,fffffd806f305300,0,0,ffff800020ed1d50) at tcp_usrreq+0xa55 sosend(fffffd806eb31648,0,ffff800020e8d0f8,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:549 dofilewritev(ffff800020ed1d50,4,ffff800020e8d0f8,0,ffff800020e8d1e0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020ed1d50,ffff800020e8d190,ffff800020e8d1e0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e8d260) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e8d260) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc6b50, count: -9