panic: tcp_output Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *476778 46135 0 0x2 0 0 syz-executor2631851858 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257b2ef) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000bb8c00) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806e9acd68,fffffd806d8da200,0,fffffd807af2fc00) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806e9acd68,0,ffff8000212c7ec0,0,fffffd807af2fc00,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806e9acd68,0,ffff8000212c7ec0,0,fffffd807af2fc00,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800021233268,3,ffff8000212c8040,0,ffff8000212c8130) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800021233268,ffff8000212c80e8,ffff8000212c8130) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff8000212c81b0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff8000212c81b0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff21a0, 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(ffffffff8257b2ef) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000bb8c00) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806e9acd68,fffffd806d8da200,0,fffffd807af2fc00) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806e9acd68,0,ffff8000212c7ec0,0,fffffd807af2fc00,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806e9acd68,0,ffff8000212c7ec0,0,fffffd807af2fc00,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800021233268,3,ffff8000212c8040,0,ffff8000212c8130) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800021233268,ffff8000212c80e8,ffff8000212c8130) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff8000212c81b0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff8000212c81b0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff21a0, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000212c7b20 rbx 0xffffffff829a1b8f cpu_info_full_primary+0x2b8f rdx 0x3fd rcx 0 rax 0x12 r8 0x101010101010101 r9 0x8080808080808080 r10 0x9f897faa7a264fb4 r11 0xabb30ba524039f6c r12 0xffffffff829a1990 cpu_info_full_primary+0x2990 r13 0 r14 0 r15 0x1 rip 0xffffffff81a16d08 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000212c7b10 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor2631851858) pid=476778 stat=onproc flags process=2 proc=0 pri=56, usrpri=56, nice=20 forw=0xffffffffffffffff, list=0xffff800021233a48,0xffffffff82af9b68 process=0xffff80002129a150 user=0xffff8000212c3000, vmspace=0xfffffd80087525c0 estcpu=6, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *46135 476778 69383 0 7 0x2 syz-executor2631851858 69383 494586 13861 0 3 0x10008a sigsusp ksh 13861 6569 56541 0 3 0x9a kqread sshd 98189 521183 1 0 3 0x100083 ttyin getty 56541 200305 1 0 3 0x88 kqread sshd 889 41707 28833 73 3 0x1100090 kqread syslogd 28833 38860 1 0 3 0x100082 netio syslogd 45907 420913 1 0 3 0x100080 kqread resolvd 51496 448863 73966 77 3 0x100092 kqread dhcpleased 2331 256337 73966 77 3 0x100092 kqread dhcpleased 73966 95548 1 0 3 0x80 kqread dhcpleased 54359 281767 0 0 3 0x14200 bored smr 17218 306459 0 0 3 0x14200 pgzero zerothread 1126 295803 0 0 3 0x14200 aiodoned aiodoned 9876 477730 0 0 3 0x14200 syncer update 14402 62171 0 0 3 0x14200 cleaner cleaner 16550 281992 0 0 3 0x14200 reaper reaper 67367 237642 0 0 3 0x14200 pgdaemon pagedaemon 35182 9057 0 0 3 0x14200 bored viomb 79218 434437 0 0 3 0x40014200 acpi0 acpi0 89170 463701 0 0 7 0x40014200 idle1 93869 103467 0 0 3 0x14200 bored softnet 50077 154717 0 0 3 0x14200 bored softnet 74182 38064 0 0 3 0x14200 bored softnet 33820 295327 0 0 3 0x14200 bored softnet 91624 162988 0 0 3 0x14200 bored systqmp 14403 218123 0 0 3 0x14200 bored systq 89815 20567 0 0 3 0x40014200 bored softclock 82968 325554 0 0 3 0x40014200 idle0 1 352949 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 46135 (syz-executor2631851858) thread 0xffff800021233268 (476778) exclusive rwlock netlock r = 0 (0xffffffff8291ebe0) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10149 6388K 6419K 78643K 11239 0 pcb 13 8K 8K 78643K 13 0 rtable 58 1K 2K 78643K 103 0 ifaddr 25 7K 7K 78643K 25 0 counters 40 33K 33K 78643K 40 0 ioctlops 0 0K 2K 78643K 25 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1166 73K 73K 78643K 1179 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 1697 195K 286K 78643K 12548 0 file desc 1 0K 0K 78643K 1 0 proc 55 78K 79K 78643K 226 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 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 25 122K 122K 78643K 25 0 exec 0 0K 2K 78643K 390 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 54 3K 4K 78643K 1408 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 3 0K 0K 78643K 3 0 temp 18 4709K 4773K 78643K 2251 0 kqueue 11 16K 18K 78643K 24 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 17 0 14 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 144 33 0 20 1 0 1 1 0 8 0 syncache 296 5 0 5 2 1 1 1 0 8 1 tcpcb 768 9 0 5 1 0 1 1 0 8 0 arp 120 2 0 0 1 0 1 1 0 8 0 inpcb 368 26 0 19 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1415 0 38 87 0 87 87 0 8 0 ffsino 272 1415 0 38 92 0 92 92 0 8 0 nchpl 144 1600 0 46 58 0 58 58 0 8 0 uvmvnodes 80 1424 0 0 30 0 30 30 0 8 0 vnodes 216 1424 0 0 80 0 80 80 0 8 0 namei 1024 4093 0 4093 2 1 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 kstatmem 264 6 0 0 1 0 1 1 0 8 0 scxspl 216 3792 0 3792 2 1 1 2 0 8 1 plimitpl 152 15 0 9 1 0 1 1 0 8 0 sigapl 424 294 0 264 4 0 4 4 0 8 0 knotepl 120 43 0 0 2 0 2 2 0 8 0 kqueuepl 216 20 0 13 1 0 1 1 0 8 0 pipepl 320 79 0 76 2 1 1 1 0 8 0 fdescpl 496 277 0 264 3 1 2 3 0 8 0 filepl 152 1044 0 990 3 0 3 3 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 104 64 0 54 1 0 1 1 0 8 0 zombiepl 144 264 0 264 2 1 1 1 0 8 1 processpl 1064 294 0 264 3 0 3 3 0 8 0 procpl 672 294 0 264 3 0 3 3 0 8 0 sockpl 488 76 0 53 3 0 3 3 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 74 0 0 9 0 9 9 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 122 0 0 8 0 8 8 0 8 0 bufpl 288 1912 0 77 132 0 132 132 0 8 0 anonpl 24 35314 0 33467 15 3 12 13 0 186 0 amapchunkpl 152 2575 0 2484 5 1 4 5 0 158 0 amappl16 200 26 0 25 2 1 1 1 0 8 0 amappl15 192 59 0 55 1 0 1 1 0 8 0 amappl13 176 32 0 31 2 1 1 1 0 8 0 amappl12 168 3 0 3 2 1 1 1 0 8 1 amappl11 160 61 0 47 1 0 1 1 0 8 0 amappl9 144 473 0 471 1 0 1 1 0 8 0 amappl8 136 334 0 333 2 1 1 1 0 8 0 amappl7 128 63 0 56 1 0 1 1 0 8 0 amappl6 120 78 0 71 1 0 1 1 0 8 0 amappl5 112 80 0 72 1 0 1 1 0 8 0 amappl4 104 569 0 550 1 0 1 1 0 8 0 amappl3 96 423 0 399 1 0 1 1 0 8 0 amappl2 88 285 0 258 1 0 1 1 0 8 0 amappl1 80 8768 0 8387 11 2 9 9 0 8 0 amappl 88 1155 0 1118 2 1 1 2 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 24 277 0 264 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 277 0 264 1 0 1 1 0 8 0 vmmpekpl 168 5885 0 5867 1 0 1 1 0 8 0 vmmpepl 168 24821 0 24036 43 5 38 38 0 357 3 vmsppl 368 276 0 264 2 0 2 2 0 8 0 rwobjpl 56 9023 0 7076 29 0 29 29 0 8 0 pdppl 4096 561 0 528 51 18 33 41 0 8 0 pvpl 32 116321 0 112617 40 7 33 33 0 265 3 pmappl 248 276 0 264 2 1 1 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 399 0 21 11 0 11 11 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(ffffffff8257b2ef) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000bb8c00) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806e9acd68,fffffd806d8da200,0,fffffd807af2fc00) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806e9acd68,0,ffff8000212c7ec0,0,fffffd807af2fc00,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806e9acd68,0,ffff8000212c7ec0,0,fffffd807af2fc00,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800021233268,3,ffff8000212c8040,0,ffff8000212c8130) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800021233268,ffff8000212c80e8,ffff8000212c8130) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff8000212c81b0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff8000212c81b0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff21a0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020dd8ff0) 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 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020dd8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:175 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800020dd8ff0) 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 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020dd8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:175 end trace frame: 0x0, count: -5 ddb{1}>