login: panic: tcp_output: template len != hdrlen - optlen Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 247307 93897 0 0x2 0 0 syz-executor.0 *348645 88879 0 0x12 0 1 sshd db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82413b0c) at panic+0x15c sys/kern/subr_prf.c:207 tcp_output(ffff800000ad9ee0) at tcp_output+0x2c4b tcp_setpersist sys/netinet/tcp_output.c:1130 [inline] tcp_output(ffff800000ad9ee0) at tcp_output+0x2c4b sys/netinet/tcp_output.c:333 tcp_usrreq(fffffd806eae8c88,9,fffffd806d6aa300,0,0,ffff800020e41d50) at tcp_usrreq+0xa55 sosend(fffffd806eae8c88,0,ffff800020e63788,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff800020e41d50,4,ffff800020e63788,0,ffff800020e63870) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020e41d50,ffff800020e63820,ffff800020e63870) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e638f0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e638f0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc68b0, 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(ffffffff82413b0c) at panic+0x15c sys/kern/subr_prf.c:207 tcp_output(ffff800000ad9ee0) at tcp_output+0x2c4b tcp_setpersist sys/netinet/tcp_output.c:1130 [inline] tcp_output(ffff800000ad9ee0) at tcp_output+0x2c4b sys/netinet/tcp_output.c:333 tcp_usrreq(fffffd806eae8c88,9,fffffd806d6aa300,0,0,ffff800020e41d50) at tcp_usrreq+0xa55 sosend(fffffd806eae8c88,0,ffff800020e63788,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff800020e41d50,4,ffff800020e63788,0,ffff800020e63870) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020e41d50,ffff800020e63820,ffff800020e63870) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e638f0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e638f0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc68b0, count: -9 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020e632f0 rbx 0xffff800020e633a0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff8151256f kprintf+0x16f r9 0x1 r10 0x2 r11 0x493e9e79a80f8a1 r12 0x3000000008 r13 0xffff800020e63300 r14 0x100 r15 0x1 rip 0xffffffff81f0cec8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020e632e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (sshd) pid=348645 stat=onproc flags process=12 proc=0 pri=50, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020e409d0,0xffff800020e40020 process=0xffff800020e387c8 user=0xffff800020e5e000, vmspace=0xfffffd806e8f8458 estcpu=0, cpticks=0, pctcpu=0.1 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 22934 463242 29467 0 3 0x82 nanosleep syz-executor.1 93897 247307 29467 0 7 0x2 syz-executor.0 29467 508343 90598 0 3 0x82 kqread syz-fuzzer 29467 520841 90598 0 3 0x4000082 nanosleep syz-fuzzer 29467 476419 90598 0 3 0x4000082 thrsleep syz-fuzzer 29467 266058 90598 0 3 0x4000082 thrsleep syz-fuzzer 29467 113043 90598 0 3 0x4000082 thrsleep syz-fuzzer 29467 378336 90598 0 3 0x4000082 nanosleep syz-fuzzer 29467 302097 90598 0 3 0x4000082 thrsleep syz-fuzzer 29467 229129 90598 0 3 0x4000082 thrsleep syz-fuzzer 29467 27041 90598 0 3 0x4000082 thrsleep syz-fuzzer 29467 36441 90598 0 3 0x4000082 thrsleep syz-fuzzer 90598 238220 88879 0 3 0x10008a pause ksh *88879 348645 46713 0 7 0x12 sshd 38359 45291 1 0 3 0x100083 ttyin getty 46713 161178 1 0 3 0x80 select sshd 3272 13192 6376 74 3 0x100092 bpf pflogd 6376 479012 1 0 3 0x80 netio pflogd 60169 435869 18555 73 3 0x100090 kqread syslogd 18555 337478 1 0 3 0x100082 netio syslogd 73866 88780 1 77 3 0x100090 poll dhclient 88741 415180 1 0 3 0x80 poll dhclient 96915 229508 0 0 3 0x14200 bored smr 88735 67195 0 0 3 0x14200 pgzero zerothread 67649 278966 0 0 3 0x14200 aiodoned aiodoned 57383 435472 0 0 3 0x14200 syncer update 23899 316614 0 0 3 0x14200 cleaner cleaner 19257 52930 0 0 3 0x14200 reaper reaper 49812 93764 0 0 3 0x14200 pgdaemon pagedaemon 6610 353666 0 0 3 0x14200 bored crynlk 84201 83545 0 0 3 0x14200 bored crypto 54362 27506 0 0 3 0x40014200 acpi0 acpi0 96799 501680 0 0 3 0x40014200 idle1 13934 248462 0 0 3 0x14200 bored softnet 99011 278934 0 0 3 0x14200 bored systqmp 44426 154578 0 0 3 0x14200 bored systq 19473 312070 0 0 3 0x40014200 bored softclock 79082 150016 0 0 3 0x40014200 idle0 1 245781 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 93897 (syz-executor.0) thread 0xffff800020dddad8 (247307) exclusive rrwlock inode r = 0 (0xfffffd8064c6ec50) #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 (0xfffffd806b208918) #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 88879 (sshd) thread 0xffff800020e41d50 (348645) exclusive rwlock netlock r = 0 (0xffffffff8276eb48) #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:543 #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 9480 6401K 6856K 78643K 10626 0 pcb 13 8K 8K 78643K 19 0 rtable 108 3K 4K 78643K 235 0 ifaddr 49 11K 12K 78643K 58 0 counters 43 33K 34K 78643K 45 0 ioctlops 0 0K 4K 78643K 1475 0 iov 0 0K 12K 78643K 2 0 mount 1 1K 1K 78643K 1 0 vnodes 1222 77K 77K 78643K 1237 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 6 0K 0K 78643K 6 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 4 9K 25K 78643K 54 0 proc 60 63K 95K 78643K 449 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 2 0 in_multi 33 2K 2K 78643K 33 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 31 148K 148K 78643K 31 0 exec 0 0K 1K 78643K 210 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 118 22K 23K 78643K 1088 0 UVM aobj 4 2K 2K 78643K 4 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 2 0 NDP 11 0K 0K 78643K 12 0 temp 71 3856K 3920K 78643K 2075 0 kqueue 3 4K 4K 78643K 3 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 45 0 43 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 43 0 33 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 14 0 10 1 0 1 1 0 8 0 inpcb 296 53 0 46 1 0 1 1 0 8 0 nd6 48 6 0 0 1 0 1 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 13 0 1 1 0 1 1 0 8 0 pfstkey 112 13 0 1 1 0 1 1 0 8 0 pfstate 328 13 0 0 2 0 2 2 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 188 0 0 12 0 12 12 0 8 0 art_table 32 189 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 semapl 112 4 0 0 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1458 0 51 89 0 89 89 0 8 0 ffsino 272 1458 0 51 95 0 95 95 0 8 0 nchpl 144 1706 0 97 60 0 60 60 0 8 0 uvmvnodes 72 1514 0 0 28 0 28 28 0 8 0 vnodes 208 1514 0 0 80 0 80 80 0 8 0 namei 1024 4496 0 4496 1 0 1 1 0 8 1 percpumem 16 33 0 1 1 0 1 1 0 8 0 scxspl 192 4896 0 4896 2 1 1 2 0 8 1 plimitpl 152 17 0 9 1 0 1 1 0 8 0 sigapl 424 269 0 239 4 0 4 4 0 8 0 futexpl 56 448 0 448 1 0 1 1 0 8 1 knotepl 112 61 0 42 1 0 1 1 0 8 0 kqueuepl 144 2 0 0 1 0 1 1 0 8 0 pipelkpl 48 89 0 79 1 0 1 1 0 8 0 pipepl 120 178 0 159 2 0 2 2 0 8 1 fdescpl 496 254 0 239 3 0 3 3 0 8 0 filepl 152 1288 0 1188 5 0 5 5 0 8 1 lockfpl 104 12 0 11 1 0 1 1 0 8 0 lockfspl 48 5 0 4 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 60 0 51 1 0 1 1 0 8 0 zombiepl 144 239 0 238 1 0 1 1 0 8 0 processpl 984 269 0 238 5 0 5 5 0 8 0 procpl 624 320 0 280 4 0 4 4 0 8 0 sockpl 400 141 0 122 3 0 3 3 0 8 1 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 222 0 0 27 0 27 27 0 8 0 mtagpl 96 8 0 0 1 0 1 1 0 8 0 mbufpl 256 234 0 0 15 0 15 15 0 8 0 bufpl 280 3388 0 133 233 0 233 233 0 8 0 anonpl 16 38466 0 23859 61 1 60 60 0 124 1 amapchunkpl 152 1197 0 1054 8 0 8 8 0 158 1 amappl16 192 975 0 197 40 0 40 40 0 8 0 amappl15 184 17 0 14 1 0 1 1 0 8 0 amappl14 176 22 0 18 1 0 1 1 0 8 0 amappl13 168 30 0 26 1 0 1 1 0 8 0 amappl12 160 6 0 3 1 0 1 1 0 8 0 amappl11 152 58 0 43 1 0 1 1 0 8 0 amappl10 144 15 0 11 1 0 1 1 0 8 0 amappl9 136 393 0 390 1 0 1 1 0 8 0 amappl8 128 363 0 331 2 0 2 2 0 8 0 amappl7 120 117 0 107 1 0 1 1 0 8 0 amappl6 112 24 0 20 1 0 1 1 0 8 0 amappl5 104 173 0 159 1 0 1 1 0 8 0 amappl4 96 485 0 459 1 0 1 1 0 8 0 amappl3 88 98 0 93 1 0 1 1 0 8 0 amappl2 80 1082 0 1018 2 0 2 2 0 8 0 amappl1 72 15552 0 15127 23 5 18 18 0 8 8 amappl 80 569 0 527 1 0 1 1 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 254 0 239 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 254 0 239 1 0 1 1 0 8 0 vmmpekpl 168 6057 0 6027 2 0 2 2 0 8 0 vmmpepl 168 38107 0 36288 120 5 115 115 0 357 30 vmsppl 368 253 0 239 2 0 2 2 0 8 0 pdppl 4096 515 0 478 6 0 6 6 0 8 1 pvpl 32 136170 0 118544 146 0 146 146 0 265 2 pmappl 232 253 0 239 2 0 2 2 0 8 1 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 265 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(ffffffff826eaff0) 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(ffffffff828c2938) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828c2938) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff828c2938,1) 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(ffff800020edcc40,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020edcc40,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020edcc40,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(fffffd806abb7e58,11,ffffffff8246a8a2,0) at tsleep+0x1cc sys/kern/kern_synch.c:155 biowait(fffffd806abb7e58) at biowait+0xa6 sys/kern/vfs_bio.c:1256 bwrite(fffffd806abb7e58) at bwrite+0x1e4 sys/kern/vfs_bio.c:765 ufs_dirremove(fffffd8068754680,fffffd8064c6ebb8,800c,1) at ufs_dirremove+0x291 ufs_rmdir(ffff800020edce68) at ufs_rmdir+0x247 sys/ufs/ufs/ufs_vnops.c:1328 VOP_RMDIR(fffffd8068754680,fffffd8064b1c5d0,ffff800020edcf68) at VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474 end trace frame: 0xffff800020edd000, count: 0 ddb{0}> trace x86_ipi_db(ffffffff826eaff0) 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(ffffffff828c2938) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828c2938) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff828c2938,1) 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(ffff800020edcc40,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020edcc40,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020edcc40,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(fffffd806abb7e58,11,ffffffff8246a8a2,0) at tsleep+0x1cc sys/kern/kern_synch.c:155 biowait(fffffd806abb7e58) at biowait+0xa6 sys/kern/vfs_bio.c:1256 bwrite(fffffd806abb7e58) at bwrite+0x1e4 sys/kern/vfs_bio.c:765 ufs_dirremove(fffffd8068754680,fffffd8064c6ebb8,800c,1) at ufs_dirremove+0x291 ufs_rmdir(ffff800020edce68) at ufs_rmdir+0x247 sys/ufs/ufs/ufs_vnops.c:1328 VOP_RMDIR(fffffd8068754680,fffffd8064b1c5d0,ffff800020edcf68) at VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474 dounlinkat(ffff800020dddad8,ffffff9c,7f7ffffbd470,8) at dounlinkat+0x14c sys/kern/vfs_syscalls.c:1886 syscall(ffff800020edd0e0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020edd0e0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbd460, 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(ffffffff82413b0c) at panic+0x15c sys/kern/subr_prf.c:207 tcp_output(ffff800000ad9ee0) at tcp_output+0x2c4b tcp_setpersist sys/netinet/tcp_output.c:1130 [inline] tcp_output(ffff800000ad9ee0) at tcp_output+0x2c4b sys/netinet/tcp_output.c:333 tcp_usrreq(fffffd806eae8c88,9,fffffd806d6aa300,0,0,ffff800020e41d50) at tcp_usrreq+0xa55 sosend(fffffd806eae8c88,0,ffff800020e63788,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff800020e41d50,4,ffff800020e63788,0,ffff800020e63870) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020e41d50,ffff800020e63820,ffff800020e63870) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e638f0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e638f0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc68b0, count: 6 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82413b0c) at panic+0x15c sys/kern/subr_prf.c:207 tcp_output(ffff800000ad9ee0) at tcp_output+0x2c4b tcp_setpersist sys/netinet/tcp_output.c:1130 [inline] tcp_output(ffff800000ad9ee0) at tcp_output+0x2c4b sys/netinet/tcp_output.c:333 tcp_usrreq(fffffd806eae8c88,9,fffffd806d6aa300,0,0,ffff800020e41d50) at tcp_usrreq+0xa55 sosend(fffffd806eae8c88,0,ffff800020e63788,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff800020e41d50,4,ffff800020e63788,0,ffff800020e63870) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020e41d50,ffff800020e63820,ffff800020e63870) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e638f0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e638f0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc68b0, count: -9