panic: tcp_ouptapunit cStopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *399709 38401 32767 0x10 0x4000000 1 syz-executor.0 324511 22286 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257befc) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000c2e628) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd807b208030,fffffd80763f8c00,0,fffffd80763f8700) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd807b208030,0,ffff80002e4ab8c0,0,fffffd80763f8700,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd807b208030,0,ffff80002e4ab8c0,0,fffffd80763f8700,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff80002d07e2a8,3,ffff80002e4aba40,0,ffff80002e4abb30) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff80002d07e2a8,ffff80002e4abae8,ffff80002e4abb30) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e4abbb0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e4abbb0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4de36937ec0, 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 cpu0: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_map.c", line 2486 *cpu1: tcp_output ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257befc) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000c2e628) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd807b208030,fffffd80763f8c00,0,fffffd80763f8700) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd807b208030,0,ffff80002e4ab8c0,0,fffffd80763f8700,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd807b208030,0,ffff80002e4ab8c0,0,fffffd80763f8700,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff80002d07e2a8,3,ffff80002e4aba40,0,ffff80002e4abb30) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff80002d07e2a8,ffff80002e4abae8,ffff80002e4abb30) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e4abbb0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e4abbb0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4de36937ec0, count: -9 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e4ab520 rbx 0xffff800020dd9b8f rdx 0xffff800000bd1240 rcx 0 rax 0xffff80002d07e2a8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x540f0505db77b548 r11 0x1e310a9952814052 r12 0xffff800020dd9990 r13 0 r14 0 r15 0x1 rip 0xffffffff823fc058 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e4ab510 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=399709 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=77, nice=20 forw=0xffffffffffffffff, list=0xffff80002d07e008,0xffff80002d07f278 process=0xffff8000ffff2158 user=0xffff80002e4a6000, vmspace=0xfffffd806c955460 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 62685 496049 35496 32767 2 0x10 syz-executor.7 38401 84732 41064 32767 2 0x10 syz-executor.0 *38401 399709 41064 32767 7 0x4000010 syz-executor.0 45174 342436 72388 32767 2 0x10 syz-executor.1 45174 409350 72388 32767 2 0x4000010 syz-executor.1 29604 81629 32056 32767 2 0x10 syz-executor.5 29604 154458 32056 32767 3 0x4000090 fsleep syz-executor.5 97173 288747 85444 32767 2 0x10 syz-executor.3 17917 307516 12339 32767 2 0x10 syz-executor.2 17917 344987 12339 32767 3 0x4000090 fsleep syz-executor.2 19897 336724 0 0 3 0x14200 bored sosplice 35496 336043 28053 32767 3 0x90 nanoslp syz-executor.7 53365 325337 19734 32767 3 0x90 nanoslp syz-executor.6 19734 493653 28041 0 3 0x82 wait syz-executor.6 28053 509498 28041 0 3 0x82 wait syz-executor.7 85444 234162 21323 32767 3 0x90 nanoslp syz-executor.3 26642 288423 45035 32767 3 0x90 nanoslp syz-executor.4 45035 241826 28041 0 3 0x82 wait syz-executor.4 32056 224309 6380 32767 3 0x90 nanoslp syz-executor.5 72388 332406 79319 32767 3 0x90 nanoslp syz-executor.1 6380 441890 28041 0 3 0x82 wait syz-executor.5 21323 13518 28041 0 3 0x82 wait syz-executor.3 79319 444849 28041 0 3 0x82 wait syz-executor.1 12339 163322 58874 32767 3 0x90 nanoslp syz-executor.2 41064 494820 31662 32767 3 0x90 nanoslp syz-executor.0 58874 268902 28041 0 3 0x82 wait syz-executor.2 31662 3018 28041 0 3 0x82 wait syz-executor.0 28041 420080 76077 0 3 0x82 wait syz-fuzzer 28041 118285 76077 0 3 0x4000082 thrsleep syz-fuzzer 28041 92053 76077 0 3 0x4000082 wait syz-fuzzer 28041 238445 76077 0 3 0x4000082 thrsleep syz-fuzzer 28041 39637 76077 0 3 0x4000082 thrsleep syz-fuzzer 28041 492809 76077 0 3 0x4000082 wait syz-fuzzer 28041 256605 76077 0 3 0x4000082 wait syz-fuzzer 28041 453869 76077 0 3 0x4000082 thrsleep syz-fuzzer 28041 51286 76077 0 3 0x4000082 thrsleep syz-fuzzer 28041 165573 76077 0 3 0x4000082 wait syz-fuzzer 28041 169850 76077 0 3 0x4000082 wait syz-fuzzer 28041 365737 76077 0 3 0x4000082 thrsleep syz-fuzzer 28041 285100 76077 0 3 0x4000082 wait syz-fuzzer 28041 76383 76077 0 3 0x4000082 wait syz-fuzzer 28041 216348 76077 0 3 0x4000082 thrsleep syz-fuzzer 28041 367935 76077 0 3 0x4000082 kqread syz-fuzzer 76077 256095 16891 0 3 0x10008a sigsusp ksh 16891 397768 27293 0 3 0x9a kqread sshd 15345 169711 1 0 3 0x100083 ttyin getty 27293 233573 1 0 3 0x88 kqread sshd 75398 329452 30516 73 3 0x1100090 kqread syslogd 30516 112963 1 0 3 0x100082 netio syslogd 19016 76924 1 0 3 0x100080 kqread resolvd 17599 142481 55876 77 3 0x100092 kqread dhcpleased 39199 276537 55876 77 3 0x100092 kqread dhcpleased 55876 203219 1 0 3 0x80 kqread dhcpleased 82862 194166 0 0 3 0x14200 bored smr 33648 354450 0 0 2 0x14200 zerothread 50920 408735 0 0 3 0x14200 aiodoned aiodoned 16147 253014 0 0 3 0x14200 syncer update 59972 220062 0 0 3 0x14200 cleaner cleaner 22286 324511 0 0 7 0x14200 reaper 56178 471467 0 0 3 0x14200 pgdaemon pagedaemon 51531 397341 0 0 3 0x14200 bored viomb 79414 408463 0 0 3 0x40014200 acpi0 acpi0 58708 168815 0 0 3 0x40014200 idle1 35043 168711 0 0 3 0x14200 bored softnet 40955 52304 0 0 3 0x14200 bored softnet 14413 133998 0 0 3 0x14200 bored softnet 77970 168288 0 0 3 0x14200 bored softnet 92979 114504 0 0 3 0x14200 bored systqmp 560 445423 0 0 3 0x14200 bored systq 41400 494760 0 0 3 0x40014200 bored softclock 76805 136944 0 0 3 0x40014200 idle0 1 345848 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex pvpl r = 0 (0xffffffff82a0c500) #0 witness_lock+0x44d #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pool_put+0x80 sys/kern/subr_pool.c:797 #4 pmap_do_remove+0x607 sys/arch/amd64/amd64/pmap.c:1878 #5 uvm_unmap_kill_entry_withlock+0x1af sys/uvm/uvm_map.c:1891 #6 uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] #6 uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2523 #7 uvmspace_free+0xa6 sys/uvm/uvm_map.c:3436 #8 reaper+0x19a sys/kern/kern_exit.c:448 #9 proc_trampoline+0x1c Process 38401 (syz-executor.0) thread 0xffff80002d07e2a8 (399709) exclusive rwlock netlock r = 0 (0xffffffff8292fbb0) #0 witness_lock+0x44d #1 sosend+0x500 sys/kern/uipc_socket.c:632 #2 sendit+0x65d sys/kern/uipc_syscalls.c:694 #3 sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 #4 syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] #4 syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 #5 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10179 6408K 6419K 78643K 11269 0 pcb 13 8K 8K 78643K 13 0 rtable 234 6K 6K 78643K 423 0 ifaddr 82 16K 16K 78643K 84 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 2K 78643K 35 0 iov 0 0K 16K 78643K 89 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1270 79K 79K 78643K 1298 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 12 0K 0K 78643K 76 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 24 89K 121K 78643K 360 0 proc 56 78K 103K 78643K 463 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 3 0 in_multi 99 6K 6K 78643K 105 0 ether_multi 1 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 2K 78643K 630 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 62K 78643K 8 0 UVM amap 239 78K 83K 78643K 3686 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 9 0 NDP 11 0K 2K 78643K 27 0 temp 99 4719K 4783K 78643K 4026 0 kqueue 12 18K 22K 78643K 35 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 plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 55 0 52 1 0 1 1 0 8 0 rtentry 112 111 0 1 4 0 4 4 0 8 0 unpcb 144 287 0 271 1 0 1 1 0 8 0 syncache 296 11 0 11 2 1 1 1 0 8 1 tcpqe 32 52 0 52 1 0 1 1 0 8 1 tcpcb 768 184 0 156 7 0 7 7 0 8 4 arp 120 18 0 0 1 0 1 1 0 8 0 ipq 40 2 0 0 1 0 1 1 0 8 0 ipqe 40 7 0 5 1 0 1 1 0 8 0 inpcb 368 289 0 276 4 0 4 4 0 8 2 nd6 48 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 452 0 0 29 0 29 29 0 8 0 art_table 32 453 0 0 4 0 4 4 0 8 0 art_node 16 110 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 16 1 0 1 1 0 8 1 semapl 112 74 0 64 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1751 0 321 90 0 90 90 0 8 0 ffsino 272 1751 0 321 96 0 96 96 0 8 0 nchpl 144 2330 0 656 63 0 63 63 0 8 0 uvmvnodes 80 1864 0 0 39 0 39 39 0 8 0 vnodes 216 1864 0 0 104 0 104 104 0 8 0 namei 1024 7830 0 7830 2 1 1 2 0 8 1 percpumem 16 40 0 0 1 0 1 1 0 8 0 kstatmem 264 22 0 0 2 0 2 2 0 8 0 scxspl 216 6792 0 6792 2 1 1 2 0 8 1 plimitpl 152 71 0 48 1 0 1 1 0 8 0 sigapl 424 645 0 590 7 0 7 7 0 8 0 futexpl 64 2387 0 2385 1 0 1 1 0 8 0 knotepl 120 108 0 0 4 0 4 4 0 8 0 kqueuepl 216 60 0 51 1 0 1 1 0 8 0 pipepl 320 225 0 197 8 0 8 8 0 8 5 fdescpl 496 627 0 592 7 1 6 6 0 8 1 filepl 152 3416 0 3174 15 0 15 15 0 8 5 lockfpl 104 18 0 16 1 0 1 1 0 8 0 lockfspl 48 10 0 8 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 23 0 7 1 0 1 1 0 8 0 ucredpl 104 277 0 259 1 0 1 1 0 8 0 zombiepl 144 592 0 590 1 0 1 1 0 8 0 processpl 1064 645 0 590 5 0 5 5 0 8 1 procpl 672 1162 0 1086 8 0 8 8 0 8 0 sosppl 168 6 0 6 1 0 1 1 0 8 1 sockpl 488 667 0 635 8 0 8 8 0 8 4 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 8 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 268 0 0 33 0 33 33 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 386 0 0 24 0 24 24 0 8 0 bufpl 288 3822 0 128 264 0 264 264 0 8 0 anonpl 24 111324 0 99434 103 3 100 100 0 186 21 amapchunkpl 152 9179 0 8535 29 0 29 29 0 158 1 amappl16 200 1719 0 1379 31 1 30 30 0 8 10 amappl15 192 173 0 165 1 0 1 1 0 8 0 amappl14 184 108 0 100 1 0 1 1 0 8 0 amappl13 176 79 0 78 1 0 1 1 0 8 0 amappl12 168 104 0 95 1 0 1 1 0 8 0 amappl11 160 79 0 65 1 0 1 1 0 8 0 amappl10 152 56 0 53 1 0 1 1 0 8 0 amappl9 144 524 0 518 1 0 1 1 0 8 0 amappl8 136 574 0 524 2 0 2 2 0 8 0 amappl7 128 115 0 97 1 0 1 1 0 8 0 amappl6 120 221 0 206 2 1 1 2 0 8 0 amappl5 112 240 0 221 1 0 1 1 0 8 0 amappl4 104 860 0 830 2 0 2 2 0 8 0 amappl3 96 1390 0 1325 2 0 2 2 0 8 0 amappl2 88 503 0 464 2 0 2 2 0 8 0 amappl1 80 16922 0 16203 19 2 17 19 0 8 1 amappl 88 3237 0 3067 6 1 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 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 72 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 628 0 592 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 628 0 592 1 0 1 1 0 8 0 vmmpekpl 168 9929 0 9876 3 0 3 3 0 8 0 vmmpepl 168 63113 0 60423 135 0 135 135 0 357 13 vmsppl 368 627 0 592 4 0 4 4 0 8 0 rwobjpl 56 18789 0 15612 49 0 49 49 0 8 1 pdppl 4096 1263 0 1184 114 33 81 93 0 8 2 pvpl 32 320490 0 303632 251 6 245 250 0 265 94 pmappl 248 627 0 592 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 671 0 36 19 0 19 19 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff82933ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x28 sys/arch/amd64/amd64/bus_space.c:651 comcnputc(800,3a) at comcnputc+0x97 sys/dev/ic/com.c:1259 cnputc(3a) at cnputc+0x4b sys/dev/cons.c:218 db_putchar(3a) at db_putchar+0x3fc sys/ddb/db_output.c:155 kprintf() at kprintf+0x6ac sys/kern/subr_prf.c:724 db_printf(ffffffff8261ba78) at db_printf+0x85 sys/kern/subr_prf.c:498 panic(ffffffff825a1bd6) at panic+0xd7 sys/kern/subr_prf.c:216 __assert(ffffffff82619795,ffffffff826448c7,9b6,ffffffff825d77c8) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_map_teardown(fffffd80759a4b98) at uvm_map_teardown+0x2e8 sys/uvm/uvm_map.c:2488 uvmspace_free(fffffd80759a4b98) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3436 reaper(ffff800021233508) at reaper+0x19a sys/kern/kern_exit.c:448 end trace frame: 0x0, count: 1 ddb{0}> trace x86_ipi_db(ffffffff82933ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x28 sys/arch/amd64/amd64/bus_space.c:651 comcnputc(800,3a) at comcnputc+0x97 sys/dev/ic/com.c:1259 cnputc(3a) at cnputc+0x4b sys/dev/cons.c:218 db_putchar(3a) at db_putchar+0x3fc sys/ddb/db_output.c:155 kprintf() at kprintf+0x6ac sys/kern/subr_prf.c:724 db_printf(ffffffff8261ba78) at db_printf+0x85 sys/kern/subr_prf.c:498 panic(ffffffff825a1bd6) at panic+0xd7 sys/kern/subr_prf.c:216 __assert(ffffffff82619795,ffffffff826448c7,9b6,ffffffff825d77c8) at __assert+0x25 sys/kern/subr_prf.c:157 uvm_map_teardown(fffffd80759a4b98) at uvm_map_teardown+0x2e8 sys/uvm/uvm_map.c:2488 uvmspace_free(fffffd80759a4b98) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3436 reaper(ffff800021233508) at reaper+0x19a sys/kern/kern_exit.c:448 end trace frame: 0x0, count: -14 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:437 panic(ffffffff8257befc) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000c2e628) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd807b208030,fffffd80763f8c00,0,fffffd80763f8700) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd807b208030,0,ffff80002e4ab8c0,0,fffffd80763f8700,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd807b208030,0,ffff80002e4ab8c0,0,fffffd80763f8700,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff80002d07e2a8,3,ffff80002e4aba40,0,ffff80002e4abb30) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff80002d07e2a8,ffff80002e4abae8,ffff80002e4abb30) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e4abbb0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e4abbb0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4de36937ec0, count: 6 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257befc) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000c2e628) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd807b208030,fffffd80763f8c00,0,fffffd80763f8700) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd807b208030,0,ffff80002e4ab8c0,0,fffffd80763f8700,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd807b208030,0,ffff80002e4ab8c0,0,fffffd80763f8700,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff80002d07e2a8,3,ffff80002e4aba40,0,ffff80002e4abb30) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff80002d07e2a8,ffff80002e4abae8,ffff80002e4abb30) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e4abbb0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e4abbb0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4de36937ec0, count: -9