panic: tcp_output: template len != hdrlen - optlen Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 395034 41126 0 0x2 0x4000000 0K syz-fuzzer *296458 6115 0 0x12 0 1 sshd db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82421839) at panic+0x164 sys/kern/subr_prf.c:218 tcp_output(ffff800000adb280) at tcp_output+0x2c4b tcp_setpersist sys/netinet/tcp_output.c:1130 [inline] tcp_output(ffff800000adb280) at tcp_output+0x2c4b sys/netinet/tcp_output.c:333 tcp_usrreq(fffffd806eae7c88,9,fffffd806d428e00,0,0,ffff8000fffffb38) at tcp_usrreq+0xa55 sosend(fffffd806eae7c88,0,ffff800020e042c8,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000fffffb38,4,ffff800020e042c8,0,ffff800020e043b0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000fffffb38,ffff800020e04360,ffff800020e043b0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e04430) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e04430) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe2850, 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(ffffffff82421839) at panic+0x164 sys/kern/subr_prf.c:218 tcp_output(ffff800000adb280) at tcp_output+0x2c4b tcp_setpersist sys/netinet/tcp_output.c:1130 [inline] tcp_output(ffff800000adb280) at tcp_output+0x2c4b sys/netinet/tcp_output.c:333 tcp_usrreq(fffffd806eae7c88,9,fffffd806d428e00,0,0,ffff8000fffffb38) at tcp_usrreq+0xa55 sosend(fffffd806eae7c88,0,ffff800020e042c8,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000fffffb38,4,ffff800020e042c8,0,ffff800020e043b0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000fffffb38,ffff800020e04360,ffff800020e043b0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e04430) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e04430) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe2850, count: -9 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020e03e30 rbx 0xffff800020e03ee0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffff800020e03df0 r9 0xffffffff814bc41f kprintf+0x16f r10 0x1 r11 0x91dcd582fc94b1e2 r12 0x3000000008 r13 0xffff800020e03e40 r14 0x100 r15 0x1 rip 0xffffffff81c991c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020e03e20 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (sshd) pid=296458 stat=onproc flags process=12 proc=0 pri=50, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffe778,0xffff8000ffffe020 process=0xffff8000ffffc7e0 user=0xffff800020dff000, vmspace=0xfffffd806e9068a8 estcpu=1, cpticks=3, pctcpu=0.0 user=0, sys=3, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 30777 108080 41126 0 2 0x482 syz-executor.1 15090 267754 41126 0 2 0x2 syz-executor.0 41126 496153 71889 0 3 0x82 thrsleep syz-fuzzer 41126 269208 71889 0 2 0x4000482 syz-fuzzer 41126 91069 71889 0 3 0x4000082 thrsleep syz-fuzzer 41126 122417 71889 0 3 0x4000082 thrsleep syz-fuzzer 41126 270232 71889 0 2 0x4000482 syz-fuzzer 41126 216762 71889 0 3 0x4000082 thrsleep syz-fuzzer 41126 395034 71889 0 7 0x4000002 syz-fuzzer 41126 158974 71889 0 3 0x4000082 thrsleep syz-fuzzer 71889 159578 6115 0 3 0x10008a pause ksh * 6115 296458 59229 0 7 0x12 sshd 71665 301508 1 0 3 0x100083 ttyin getty 59229 412211 1 0 3 0x80 select sshd 12012 86529 32807 74 3 0x100092 bpf pflogd 32807 490359 1 0 3 0x80 netio pflogd 61666 384596 50992 73 3 0x100090 kqread syslogd 50992 415408 1 0 3 0x100082 netio syslogd 14197 306483 1 77 3 0x100090 poll dhclient 49343 311447 1 0 3 0x80 poll dhclient 84276 15933 0 0 3 0x14200 bored smr 88973 76513 0 0 3 0x14200 pgzero zerothread 56603 484266 0 0 3 0x14200 aiodoned aiodoned 87288 180477 0 0 3 0x14200 syncer update 3211 493446 0 0 3 0x14200 cleaner cleaner 52964 283484 0 0 3 0x14200 reaper reaper 36131 158557 0 0 3 0x14200 pgdaemon pagedaemon 14731 487942 0 0 3 0x14200 bored crynlk 44342 448606 0 0 3 0x14200 bored crypto 41823 30537 0 0 3 0x40014200 acpi0 acpi0 87154 486946 0 0 3 0x40014200 idle1 89250 458928 0 0 3 0x14200 bored softnet 2227 298640 0 0 3 0x14200 bored systqmp 35968 411606 0 0 3 0x14200 bored systq 32011 322271 0 0 3 0x40014200 bored softclock 79337 201033 0 0 3 0x40014200 idle0 1 407853 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 15090 (syz-executor.0) thread 0xffff800020dd69e8 (267754) exclusive rrwlock inode r = 0 (0xfffffd80680955f0) #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 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x13e sys/ufs/ffs/ffs_vfsops.c:1358 #5 ffs_inode_alloc+0x1e2 sys/ufs/ffs/ffs_alloc.c:394 #6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #7 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 #8 domkdirat+0x121 sys/kern/vfs_syscalls.c:3051 #9 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #9 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8068095a30) #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 domkdirat+0x75 sys/kern/vfs_syscalls.c:3036 #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 41126 (syz-fuzzer) thread 0xffff800020dd7640 (158974) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828dd3d0) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 uvm_map_inentry+0xbe sys/uvm/uvm_map.c:1890 #2 syscall+0x397 mi_syscall sys/sys/syscall_mi.h:81 [inline] #2 syscall+0x397 sys/arch/amd64/amd64/trap.c:570 #3 Xsyscall+0x128 Process 6115 (sshd) thread 0xffff8000fffffb38 (296458) exclusive rwlock netlock r = 0 (0xffffffff827a6120) #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 9474 6399K 6404K 78643K 10571 0 pcb 13 8K 8K 78643K 13 0 rtable 105 3K 3K 78643K 201 0 ifaddr 49 11K 11K 78643K 52 0 counters 43 33K 33K 78643K 43 0 ioctlops 0 0K 4K 78643K 1469 0 iov 0 0K 2K 78643K 2 0 mount 1 1K 1K 78643K 1 0 vnodes 1217 77K 77K 78643K 1223 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 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 4 9K 25K 78643K 41 0 proc 59 63K 95K 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 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 19 95K 95K 78643K 19 0 exec 0 0K 1K 78643K 207 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 188 30K 30K 78643K 1114 0 UVM aobj 7 2K 2K 78643K 7 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 7 0K 0K 78643K 11 0 temp 72 3860K 3924K 78643K 2029 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 88 19 0 17 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 272 4 0 4 1 1 0 1 0 8 0 tcpqe 32 148 0 148 2 1 1 1 0 8 1 tcpcb 592 11 0 6 1 0 1 1 0 8 0 inpcb 296 42 0 35 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 12 0 2 1 0 1 1 0 8 0 pfstkey 112 12 0 2 1 0 1 1 0 8 0 pfstate 328 12 0 2 1 0 1 1 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 256 187 0 0 12 0 12 12 0 8 0 art_table 32 188 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 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 1435 0 31 88 0 88 88 0 8 0 ffsino 272 1435 0 31 95 1 94 94 0 8 0 nchpl 144 1665 0 59 60 0 60 60 0 8 0 uvmvnodes 72 1479 0 0 27 0 27 27 0 8 0 vnodes 208 1479 0 0 78 0 78 78 0 8 0 namei 1024 4361 0 4360 2 1 1 1 0 8 0 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 200 4921 0 4921 8 1 7 7 0 8 7 plimitpl 152 15 0 7 1 0 1 1 0 8 0 sigapl 424 256 0 226 4 0 4 4 0 8 0 futexpl 56 115 0 115 1 0 1 1 0 8 1 knotepl 112 62 0 42 1 0 1 1 0 8 0 kqueuepl 152 2 0 0 1 0 1 1 0 8 0 pipepl 304 79 0 68 2 0 2 2 0 8 1 fdescpl 496 241 0 226 3 0 3 3 0 8 0 filepl 152 1186 0 1084 6 1 5 5 0 8 0 lockfpl 104 7 0 6 1 0 1 1 0 8 0 lockfspl 48 4 0 3 1 0 1 1 0 8 0 sessionpl 120 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 53 0 44 1 0 1 1 0 8 0 zombiepl 144 226 0 225 2 1 1 1 0 8 0 processpl 1008 256 0 225 6 1 5 5 0 8 0 procpl 632 277 0 239 5 1 4 4 0 8 0 sockpl 400 104 0 85 4 1 3 3 0 8 1 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 156 0 0 19 0 19 19 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 178 0 0 11 0 11 11 0 8 0 mbufpl: pool(0xffffffff828ce6d0:mbufpl): free list modified: page 0xfffffd806b7e6000; item ordinal 13; addr 0xfffffd806b7e6f00 (p 0xfffffd807eb44000); offset 0x0=0x0 pool(mbufpl): free list modified: page 0xfffffd806b7e6000; item ordinal 13; addr 0xfffffd806b7e6f00 (p 0xfffffd807eb44000); offset 0x0=0x0 mbufpl: pool(0xffffffff828ce6d0:mbufpl): page inconsistency: page 0xfffffd806b7e6000; item ordinal 14; addr 0x549aae57cab10b bufpl 280 3318 0 127 228 0 228 228 0 8 0 anonpl 16 39433 0 23050 67 1 66 66 0 124 0 amapchunkpl 152 1357 0 1033 15 0 15 15 0 158 0 amappl16 192 849 0 147 36 0 36 36 0 8 0 amappl15 184 2 0 0 1 0 1 1 0 8 0 amappl14 176 11 0 7 1 0 1 1 0 8 0 amappl13 168 29 0 26 1 0 1 1 0 8 0 amappl12 160 24 0 19 1 0 1 1 0 8 0 amappl11 152 63 0 46 1 0 1 1 0 8 0 amappl10 144 17 0 12 1 0 1 1 0 8 0 amappl9 136 232 0 231 1 0 1 1 0 8 0 amappl8 128 392 0 329 3 0 3 3 0 8 0 amappl7 120 115 0 104 1 0 1 1 0 8 0 amappl6 112 35 0 27 1 0 1 1 0 8 0 amappl5 104 395 0 380 1 0 1 1 0 8 0 amappl4 96 492 0 464 1 0 1 1 0 8 0 amappl3 88 123 0 112 1 0 1 1 0 8 0 amappl2 80 987 0 925 2 0 2 2 0 8 0 amappl1 72 15454 0 15029 24 11 13 18 0 8 3 amappl 80 575 0 488 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 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 241 0 226 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 241 0 226 1 0 1 1 0 8 0 vmmpekpl 168 6020 0 5989 2 0 2 2 0 8 0 vmmpepl 168 37333 0 35496 130 12 118 118 0 357 33 vmsppl 368 240 0 226 2 0 2 2 0 8 0 pdppl 4096 489 0 452 7 1 6 6 0 8 0 pvpl 32 135993 0 116589 160 0 160 160 0 265 2 pmappl 232 240 0 226 2 0 2 2 0 8 1 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 250 0 8 7 0 7 7 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff827b4ff0) 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 spllower(d) at spllower+0x46 intr_disable machine/cpufunc.h:216 [inline] spllower(d) at spllower+0x46 sys/arch/amd64/amd64/intr.c:719 tsleep(fffffd806e8cde40,118,ffffffff8246f490,50) at tsleep+0x1aa sys/kern/kern_synch.c:146 kqueue_sleep(fffffd806e8cde40,ffff800020ea2220) at kqueue_sleep+0x101 sys/kern/kern_event.c:885 kqueue_scan(fffffd806e8cde40,40,c000201638,ffff800020ea2220,ffff800020dd64f8,ffff800020ea226c) at kqueue_scan+0x2b6 sys/kern/kern_event.c:928 sys_kevent(ffff800020dd64f8,ffff800020ea22e0,ffff800020ea2330) at sys_kevent+0x464 sys/kern/kern_event.c:640 syscall(ffff800020ea23b0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020ea23b0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc000201e38, count: 5 ddb{0}> trace x86_ipi_db(ffffffff827b4ff0) 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 spllower(d) at spllower+0x46 intr_disable machine/cpufunc.h:216 [inline] spllower(d) at spllower+0x46 sys/arch/amd64/amd64/intr.c:719 tsleep(fffffd806e8cde40,118,ffffffff8246f490,50) at tsleep+0x1aa sys/kern/kern_synch.c:146 kqueue_sleep(fffffd806e8cde40,ffff800020ea2220) at kqueue_sleep+0x101 sys/kern/kern_event.c:885 kqueue_scan(fffffd806e8cde40,40,c000201638,ffff800020ea2220,ffff800020dd64f8,ffff800020ea226c) at kqueue_scan+0x2b6 sys/kern/kern_event.c:928 sys_kevent(ffff800020dd64f8,ffff800020ea22e0,ffff800020ea2330) at sys_kevent+0x464 sys/kern/kern_event.c:640 syscall(ffff800020ea23b0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020ea23b0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc000201e38, count: -10 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(ffffffff82421839) at panic+0x164 sys/kern/subr_prf.c:218 tcp_output(ffff800000adb280) at tcp_output+0x2c4b tcp_setpersist sys/netinet/tcp_output.c:1130 [inline] tcp_output(ffff800000adb280) at tcp_output+0x2c4b sys/netinet/tcp_output.c:333 tcp_usrreq(fffffd806eae7c88,9,fffffd806d428e00,0,0,ffff8000fffffb38) at tcp_usrreq+0xa55 sosend(fffffd806eae7c88,0,ffff800020e042c8,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000fffffb38,4,ffff800020e042c8,0,ffff800020e043b0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000fffffb38,ffff800020e04360,ffff800020e043b0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e04430) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e04430) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe2850, count: 6 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82421839) at panic+0x164 sys/kern/subr_prf.c:218 tcp_output(ffff800000adb280) at tcp_output+0x2c4b tcp_setpersist sys/netinet/tcp_output.c:1130 [inline] tcp_output(ffff800000adb280) at tcp_output+0x2c4b sys/netinet/tcp_output.c:333 tcp_usrreq(fffffd806eae7c88,9,fffffd806d428e00,0,0,ffff8000fffffb38) at tcp_usrreq+0xa55 sosend(fffffd806eae7c88,0,ffff800020e042c8,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000fffffb38,4,ffff800020e042c8,0,ffff800020e043b0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000fffffb38,ffff800020e04360,ffff800020e043b0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e04430) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e04430) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe2850, count: -9