panic: tcp_output Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *467885 59417 0 0 0x4000000 0 syz-executor.5 11817 59477 0 0x2 0 1 syz-executor.3 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257e141) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000bd7b00) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806e402b88,fffffd80707c3100,0,fffffd80707c3000) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd806e402b88,0,ffff80002133be70,0,fffffd80707c3000,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806e402b88,0,ffff80002133be70,0,fffffd80707c3000,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800021317510,3,ffff80002133bff0,0,ffff80002133c0e0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800021317510,ffff80002133c098,ffff80002133c0e0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002133c160) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002133c160) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x66dc28444d0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: tcp_output ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257e141) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000bd7b00) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806e402b88,fffffd80707c3100,0,fffffd80707c3000) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd806e402b88,0,ffff80002133be70,0,fffffd80707c3000,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806e402b88,0,ffff80002133be70,0,fffffd80707c3000,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800021317510,3,ffff80002133bff0,0,ffff80002133c0e0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800021317510,ffff80002133c098,ffff80002133c0e0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002133c160) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002133c160) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x66dc28444d0, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002133bad0 rbx 0xffffffff82941b8f cpu_info_full_primary+0x2b8f rdx 0xffff800000bf4a40 rcx 0 rax 0xffff800021317510 r8 0 r9 0x8080808080808080 r10 0x5c0b6f84274ff185 r11 0x5158e8da3eb6a44f r12 0xffffffff82941990 cpu_info_full_primary+0x2990 r13 0 r14 0 r15 0x1 rip 0xffffffff81927ac8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002133bac0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.5) pid=467885 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff8000213177b0,0xffff800021317a60 process=0xffff800027be3a48 user=0xffff800021337000, vmspace=0xfffffd806c6742f8 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 87923 303710 61425 0 2 0 syz-executor.2 7723 76192 15254 0 2 0 syz-executor.0 7723 108327 15254 0 2 0x4000000 syz-executor.0 34448 416979 29190 0 2 0 syz-executor.4 15353 20913 42471 0 2 0 syz-executor.7 15353 73823 42471 0 2 0x4000000 syz-executor.7 22729 61607 1544 0 2 0 syz-executor.6 22729 243869 1544 0 3 0x4000080 fsleep syz-executor.6 59417 337132 57884 0 2 0 syz-executor.5 *59417 467885 57884 0 7 0x4000000 syz-executor.5 2380 519171 2723 0 2 0x2 syz-executor.1 58935 434281 1 0 3 0 vmmapbsy syz-executor.1 58935 472241 1 0 3 0x4000000 vmmaplk syz-executor.1 29190 264547 2723 0 3 0x82 nanoslp syz-executor.4 66918 453942 82821 0 3 0x100082 netio ndp 82821 16504 1 0 3 0x10008a sigsusp sh 1544 312115 2723 0 3 0x82 nanoslp syz-executor.6 42471 237630 2723 0 2 0x2 syz-executor.7 57884 293798 2723 0 3 0x82 nanoslp syz-executor.5 61425 171381 2723 0 3 0x82 nanoslp syz-executor.2 59477 11817 2723 0 7 0x2 syz-executor.3 15254 240035 2723 0 2 0x482 syz-executor.0 2723 431805 44974 0 3 0x82 wait syz-fuzzer 2723 16705 44974 0 3 0x4000082 thrsleep syz-fuzzer 2723 376095 44974 0 3 0x4000082 thrsleep syz-fuzzer 2723 180004 44974 0 3 0x4000082 wait syz-fuzzer 2723 20324 44974 0 3 0x4000082 thrsleep syz-fuzzer 2723 156756 44974 0 3 0x4000082 wait syz-fuzzer 2723 521383 44974 0 3 0x4000082 thrsleep syz-fuzzer 2723 134493 44974 0 3 0x4000082 thrsleep syz-fuzzer 2723 489186 44974 0 3 0x4000082 wait syz-fuzzer 2723 7458 44974 0 3 0x4000082 wait syz-fuzzer 2723 276409 44974 0 3 0x4000082 kqread syz-fuzzer 2723 268162 44974 0 3 0x4000082 thrsleep syz-fuzzer 2723 103928 44974 0 3 0x4000082 wait syz-fuzzer 2723 246068 44974 0 3 0x4000082 wait syz-fuzzer 2723 388240 44974 0 3 0x4000082 wait syz-fuzzer 2723 449753 44974 0 3 0x4000082 thrsleep syz-fuzzer 44974 368529 49099 0 3 0x10008a sigsusp ksh 49099 494032 83374 0 3 0x9a kqread sshd 66418 210231 1 0 3 0x100083 ttyin getty 83374 204879 1 0 3 0x88 kqread sshd 87898 258986 27234 74 3 0x1100092 bpf pflogd 27234 228364 1 0 3 0x80 netio pflogd 48014 13632 7497 73 3 0x1100090 kqread syslogd 7497 503577 1 0 3 0x100082 netio syslogd 68380 485952 1 0 3 0x100080 kqread resolvd 58275 190249 42401 77 3 0x100092 kqread dhcpleased 87571 416930 42401 77 3 0x100092 kqread dhcpleased 42401 190317 1 0 3 0x80 kqread dhcpleased 98279 32237 0 0 3 0x14200 bored smr 32196 192565 0 0 2 0x14200 zerothread 84447 426681 0 0 3 0x14200 aiodoned aiodoned 63099 134121 0 0 3 0x14200 syncer update 96398 522545 0 0 3 0x14200 cleaner cleaner 57185 440968 0 0 3 0x14200 reaper reaper 5151 463625 0 0 3 0x14200 pgdaemon pagedaemon 49519 316087 0 0 3 0x14200 bored viomb 37250 265795 0 0 3 0x40014200 acpi0 acpi0 42682 152091 0 0 3 0x40014200 idle1 14340 395778 0 0 3 0x14200 bored softnet 41544 283950 0 0 3 0x14200 bored softnet 49910 24486 0 0 3 0x14200 bored softnet 88305 356530 0 0 3 0x14200 bored softnet 84476 371517 0 0 3 0x14200 bored systqmp 28903 452761 0 0 3 0x14200 bored systq 75412 146211 0 0 3 0x40014200 bored softclock 54840 111565 0 0 3 0x40014200 idle0 1 257328 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 59417 (syz-executor.5) thread 0xffff800021317510 (467885) exclusive rwlock netlock r = 0 (0xffffffff829d5f30) #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 Process 58935 (syz-executor.1) thread 0xffff80002132ed20 (472241) shared rwlock vmmaplk r = 0 (0xfffffd806c6741a0) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5209 #3 uvm_map_pageable+0x11a sys/uvm/uvm_map.c:2240 #4 sys_mlock+0x184 sys/uvm/uvm_mmap.c:804 #5 syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] #5 syscall+0x435 sys/arch/amd64/amd64/trap.c:585 #6 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10195 6495K 6817K 78643K 35856 0 pcb 13 12K 14K 78643K 1900 0 rtable 234 6K 6K 78643K 403 0 ifaddr 87 17K 17K 78643K 106 0 sysctl 2 0K 0K 78643K 2 0 counters 56 35K 35K 78643K 60 0 ioctlops 0 0K 4K 78643K 2588 0 iov 0 0K 8K 78643K 1123 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1429 89K 89K 78643K 14103 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 17K 78643K 1315 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1330 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 19 69K 93K 78643K 58524 0 sigio 0 0K 0K 78643K 2528 0 proc 67 91K 128K 78643K 562 0 subproc 130 8K 8K 78643K 130 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 99 6K 6K 78643K 121 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 103 466K 466K 78643K 103 0 exec 0 0K 2K 78643K 691 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 282 90K 98K 78643K 299603 0 UVM aobj 131 4K 4K 78643K 185 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 12 0K 1K 78643K 34 0 temp 132 4722K 4850K 78643K 135851 0 kqueue 12 18K 20K 78643K 436 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> 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 37 0 33 1 0 1 1 0 8 0 rtentry 112 132 0 22 4 0 4 4 0 8 0 unpcb 144 9571 0 9554 66 62 4 6 0 8 3 syncache 296 4 0 4 1 1 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpcb 768 109 0 104 6 5 1 3 0 8 0 arp 120 22 0 4 1 0 1 1 0 8 0 inpcb 368 8315 0 8307 76 75 1 7 0 8 0 nd6 48 29 0 5 1 0 1 1 0 8 0 kcovpl 48 10 0 0 1 0 1 1 0 8 0 pffrag 232 32 0 32 4 4 0 2 0 482 0 pffrnode 88 27 0 27 3 3 0 1 0 8 0 pffrent 40 317 0 317 3 3 0 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 78 0 72 1 0 1 1 0 8 0 pfstkey 120 78 0 72 1 0 1 1 0 8 0 pfstate 336 78 0 72 4 3 1 3 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 256 539 0 87 29 0 29 29 0 8 0 art_table 32 540 0 87 4 0 4 4 0 8 0 art_node 16 131 0 31 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 0 1 0 1 1 0 8 0 semapl 112 1328 0 1318 1 0 1 1 0 8 0 shmpl 112 182 0 54 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 60701 0 59263 91 0 91 91 0 8 0 ffsino 272 60701 0 59263 97 0 97 97 0 8 0 nchpl 144 123352 0 121707 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 350336 0 350336 4 3 1 2 0 8 1 percpumem 16 42 0 2 1 0 1 1 0 8 0 kstatmem 264 28 0 4 2 0 2 2 0 8 0 scxspl 216 359129 0 359129 13 12 1 8 0 8 1 plimitpl 152 208 0 191 1 0 1 1 0 8 0 sigapl 424 58824 0 58774 8 1 7 7 0 8 0 futexpl 64 298091 0 298090 3 2 1 1 0 8 0 knotepl 120 109 0 0 4 0 4 4 0 8 0 kqueuepl 216 2468 0 2460 44 43 1 5 0 8 0 pipepl 320 4440 0 4408 83 80 3 9 0 8 0 fdescpl 496 58807 0 58775 5 0 5 5 0 8 0 filepl 152 191572 0 191298 174 160 14 19 0 8 3 lockfpl 104 5164 0 5162 7 6 1 2 0 8 0 lockfspl 48 1736 0 1734 1 0 1 1 0 8 0 sessionpl 144 26 0 7 1 0 1 1 0 8 0 pgrppl 48 312 0 293 1 0 1 1 0 8 0 ucredpl 104 4193 0 4181 1 0 1 1 0 8 0 zombiepl 144 58775 0 58774 3 2 1 1 0 8 0 processpl 1064 58824 0 58774 4 0 4 4 0 8 0 procpl 672 136177 0 136107 24 17 7 8 0 8 0 srpgc 96 4 0 4 2 1 1 1 0 8 1 sockpl 488 17923 0 17894 281 268 13 28 0 8 9 mcl64k 65536 25 0 0 4 1 3 3 0 8 0 mcl16k 16384 36 0 0 5 3 2 3 0 8 0 mcl12k 12288 41 0 0 2 0 2 2 0 8 0 mcl9k 9216 46 0 0 2 0 2 2 0 8 0 mcl8k 8192 42 0 0 3 0 3 3 0 8 0 mcl4k 4096 49 0 0 4 1 3 3 0 8 0 mcl2k2 2112 12 0 0 1 0 1 1 0 8 0 mcl2k 2048 232 0 0 13 0 13 13 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1482 0 0 28 7 21 22 0 8 0 bufpl 288 62148 0 55813 453 0 453 453 0 8 0 anonpl 24 9696724 0 9688355 178 113 65 100 0 186 0 amapchunkpl 152 861768 0 861135 79 50 29 29 0 158 2 amappl16 200 123262 0 123057 108 96 12 37 0 8 1 amappl15 192 29010 0 28999 1 0 1 1 0 8 0 amappl14 184 7430 0 7420 1 0 1 1 0 8 0 amappl13 176 7235 0 7232 1 0 1 1 0 8 0 amappl12 168 10 0 6 1 0 1 1 0 8 0 amappl11 160 86 0 68 1 0 1 1 0 8 0 amappl10 152 23 0 20 1 0 1 1 0 8 0 amappl9 144 22866 0 22857 1 0 1 1 0 8 0 amappl8 136 1292 0 1153 6 1 5 5 0 8 0 amappl7 128 218 0 198 1 0 1 1 0 8 0 amappl6 120 22591 0 22572 2 1 1 2 0 8 0 amappl5 112 52750 0 52733 1 0 1 1 0 8 0 amappl4 104 10217 0 10180 2 0 2 2 0 8 0 amappl3 96 163483 0 163430 2 0 2 2 0 8 0 amappl2 88 11267 0 11227 2 1 1 2 0 8 0 amappl1 80 1387360 0 1386637 44 27 17 20 0 8 0 amappl 88 296958 0 296808 5 1 4 4 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 72 184 0 54 3 0 3 3 0 8 0 uaddrrnd 24 58807 0 58775 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 58807 0 58775 1 0 1 1 0 8 0 vmmpekpl 168 323448 0 323397 3 0 3 3 0 8 0 vmmpepl 168 5422649 0 5420191 359 241 118 130 0 357 5 vmsppl 368 58806 0 58775 4 0 4 4 0 8 0 rwobjpl 56 1233009 0 1225585 125 17 108 112 0 8 0 pdppl 4096 117621 0 117550 1493 1418 75 85 0 8 4 pvpl 32 18739722 0 18726714 546 426 120 258 0 265 0 pmappl 248 58806 0 58775 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2317 0 1514 24 0 24 24 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257e141) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000bd7b00) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806e402b88,fffffd80707c3100,0,fffffd80707c3000) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd806e402b88,0,ffff80002133be70,0,fffffd80707c3000,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806e402b88,0,ffff80002133be70,0,fffffd80707c3000,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800021317510,3,ffff80002133bff0,0,ffff80002133c0e0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800021317510,ffff80002133c098,ffff80002133c0e0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002133c160) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002133c160) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x66dc28444d0, count: -9 ddb{0}> machine ddbcpu 1