panic: tcp_output Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 71329 60415 32767 0x10 0 1 syz-executor.5 *200383 22054 32767 0x10 0x4000000 0 syz-executor.2 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(ffff800000caacc8) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd807476bba0,fffffd806ef72f00,fffffd8068ccef00,fffffd807caa1200) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd807476bba0,fffffd8068ccef00,ffff800022b78bb0,0,fffffd807caa1200,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd807476bba0,fffffd8068ccef00,ffff800022b78bb0,0,fffffd807caa1200,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000233c8550,4,ffff800022b78d30,0,ffff800022b78e20) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000233c8550,ffff800022b78dd8,ffff800022b78e20) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff800022b78ea0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff800022b78ea0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x906cba244b0, 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(ffff800000caacc8) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd807476bba0,fffffd806ef72f00,fffffd8068ccef00,fffffd807caa1200) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd807476bba0,fffffd8068ccef00,ffff800022b78bb0,0,fffffd807caa1200,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd807476bba0,fffffd8068ccef00,ffff800022b78bb0,0,fffffd807caa1200,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000233c8550,4,ffff800022b78d30,0,ffff800022b78e20) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000233c8550,ffff800022b78dd8,ffff800022b78e20) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff800022b78ea0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff800022b78ea0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x906cba244b0, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800022b78810 rbx 0xffffffff829a1b8f cpu_info_full_primary+0x2b8f rdx 0xffff800000be8940 rcx 0 rax 0xffff8000233c8550 r8 0x101010101010101 r9 0x8080808080808080 r10 0x99d6a2b7d6b36b24 r11 0x90a51a22f2f8aed3 r12 0xffffffff829a1990 cpu_info_full_primary+0x2990 r13 0 r14 0 r15 0x1 rip 0xffffffff81a16d08 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022b78800 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.2) pid=200383 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff8000233c8010,0xffff800022f96a98 process=0xffff8000ffff8858 user=0xffff800022b73000, vmspace=0xfffffd8008752b80 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 60415 71329 91589 32767 7 0x10 syz-executor.5 60415 200296 91589 32767 3 0x4000090 netcon syz-executor.5 60415 330506 91589 32767 3 0x4000090 fsleep syz-executor.5 53531 426887 27464 32767 3 0x90 nanoslp syz-executor.1 53531 7618 27464 32767 3 0x4000090 fsleep syz-executor.1 53531 396770 27464 32767 3 0x4000090 fsleep syz-executor.1 53531 128758 27464 32767 3 0x4000090 fsleep syz-executor.1 22054 363842 70390 32767 2 0x10 syz-executor.2 *22054 200383 70390 32767 7 0x4000010 syz-executor.2 70390 398038 32964 32767 3 0x90 nanoslp syz-executor.2 32964 256792 93964 0 3 0x82 wait syz-executor.2 91589 149045 51818 32767 3 0x90 nanoslp syz-executor.5 51818 242768 93964 0 3 0x82 wait syz-executor.5 22788 212843 1219 32767 3 0x90 piperd syz-executor.4 1219 258330 93964 0 3 0x82 wait syz-executor.4 27464 118048 98590 32767 3 0x90 nanoslp syz-executor.1 98590 100371 93964 0 3 0x82 wait syz-executor.1 83848 301601 81382 32767 3 0x90 nanoslp syz-executor.0 81382 36205 93964 0 3 0x82 wait syz-executor.0 33157 151794 0 0 3 0x14200 bored sosplice 6335 496152 78135 0 3 0x100082 netio arp 78135 190213 52036 0 3 0x10008a sigsusp sh 84285 268412 32755 32767 3 0x90 piperd syz-executor.6 11665 110485 4945 32767 3 0x90 piperd syz-executor.7 4945 185120 93964 0 3 0x82 wait syz-executor.7 52036 301621 1 0 3 0x80 wait syz-executor.5 76352 274652 5626 32767 3 0x90 piperd syz-executor.3 32755 396798 93964 0 3 0x82 wait syz-executor.6 5626 421892 93964 0 3 0x82 wait syz-executor.3 93964 430731 88907 0 3 0x82 wait syz-fuzzer 93964 328951 88907 0 3 0x4000082 nanoslp syz-fuzzer 93964 246651 88907 0 3 0x4000082 thrsleep syz-fuzzer 93964 35219 88907 0 3 0x4000082 wait syz-fuzzer 93964 235887 88907 0 3 0x4000082 thrsleep syz-fuzzer 93964 497724 88907 0 3 0x4000082 wait syz-fuzzer 93964 364129 88907 0 3 0x4000082 thrsleep syz-fuzzer 93964 425503 88907 0 3 0x4000082 thrsleep syz-fuzzer 93964 507750 88907 0 3 0x4000082 wait syz-fuzzer 93964 456092 88907 0 3 0x4000082 wait syz-fuzzer 93964 363411 88907 0 3 0x4000082 wait syz-fuzzer 93964 45654 88907 0 3 0x4000082 wait syz-fuzzer 93964 496760 88907 0 3 0x4000082 thrsleep syz-fuzzer 93964 25981 88907 0 3 0x4000082 wait syz-fuzzer 93964 101596 88907 0 3 0x4000082 thrsleep syz-fuzzer 93964 491104 88907 0 3 0x4000082 kqread syz-fuzzer 88907 266150 96790 0 3 0x10008a sigsusp ksh 96790 297899 63110 0 3 0x9a kqread sshd 16875 278264 1 0 3 0x100083 ttyin getty 63110 165112 1 0 3 0x88 kqread sshd 84034 381305 16363 73 3 0x1100090 kqread syslogd 16363 225180 1 0 3 0x100082 netio syslogd 85835 364232 1 0 3 0x100080 kqread resolvd 94589 488232 2546 77 3 0x100092 kqread dhcpleased 19801 363448 2546 77 3 0x100092 kqread dhcpleased 2546 500421 1 0 3 0x80 kqread dhcpleased 64597 15809 0 0 3 0x14200 bored smr 61083 293018 0 0 2 0x14200 zerothread 19442 124789 0 0 3 0x14200 aiodoned aiodoned 57932 224778 0 0 3 0x14200 syncer update 36914 410187 0 0 3 0x14200 cleaner cleaner 86712 227789 0 0 3 0x14200 reaper reaper 36678 203997 0 0 3 0x14200 pgdaemon pagedaemon 12537 101339 0 0 3 0x14200 bored viomb 29264 177515 0 0 3 0x40014200 acpi0 acpi0 39083 389940 0 0 3 0x40014200 idle1 41113 403260 0 0 3 0x14200 bored softnet 50359 306336 0 0 3 0x14200 bored softnet 34904 353805 0 0 3 0x14200 bored softnet 37519 41916 0 0 3 0x14200 bored softnet 26358 511948 0 0 3 0x14200 bored systqmp 54354 31628 0 0 3 0x14200 bored systq 62530 179912 0 0 3 0x40014200 bored softclock 67972 463648 0 0 3 0x40014200 idle0 1 318372 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 22054 (syz-executor.2) thread 0xffff8000233c8550 (200383) 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 10223 6413K 6419K 78643K 11345 0 pcb 13 12K 14K 78643K 17 0 rtable 238 6K 7K 78643K 907 0 ifaddr 82 17K 17K 78643K 154 0 sysctl 2 0K 2K 78643K 5 0 counters 56 35K 35K 78643K 76 0 ioctlops 0 0K 2K 78643K 166 0 iov 0 0K 24K 78643K 1655 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1284 80K 80K 78643K 4126 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 64 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 2931 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 25 93K 125K 78643K 6366 0 sigio 0 0K 0K 78643K 100 0 proc 56 78K 139K 78643K 1191 0 subproc 117 7K 7K 78643K 234 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 593 0 in_multi 99 6K 6K 78643K 257 0 ether_multi 1 0K 0K 78643K 15 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 319 1420K 1420K 78643K 319 0 exec 0 0K 2K 78643K 1380 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 348 100K 115K 78643K 40974 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 160 0 NDP 11 0K 2K 78643K 55 0 temp 128 4726K 4806K 78643K 18829 0 kqueue 12 18K 44K 78643K 2285 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 120 684 0 680 12 10 2 3 0 8 1 rtentry 112 224 0 112 4 0 4 4 0 8 0 unpcb 144 8501 0 8423 60 54 6 6 0 8 3 syncache 296 68 0 68 13 13 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 191 0 191 11 11 0 1 0 8 0 tcpcb 768 2873 0 2861 128 126 2 18 0 8 0 arp 120 39 0 21 1 0 1 1 0 8 0 ipq 40 7 0 6 4 3 1 1 0 8 0 ipqe 40 22 0 21 4 3 1 1 0 8 0 inpcb 368 5242 0 5229 120 118 2 14 0 8 0 nd6 48 60 0 34 1 0 1 1 0 8 0 kcovpl 48 18 0 9 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 903 0 439 32 2 30 31 0 8 0 art_table 32 904 0 439 4 0 4 4 0 8 0 art_node 16 223 0 121 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 4 1 1 0 1 0 8 0 semapl 112 2925 0 2915 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 11532 0 10094 91 0 91 91 0 8 0 ffsino 272 11532 0 10094 97 0 97 97 0 8 0 nchpl 144 20431 0 18797 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 79571 0 79571 7 6 1 2 0 8 1 percpumem 16 50 0 10 1 0 1 1 0 8 0 kstatmem 264 42 0 20 2 0 2 2 0 8 0 scxspl 216 60067 0 60067 34 32 2 8 0 8 2 plimitpl 152 1599 0 1576 23 22 1 2 0 8 0 sigapl 424 6641 0 6587 7 0 7 7 0 8 0 futexpl 64 59445 0 59441 7 6 1 1 0 8 0 knotepl 120 525 0 0 10 1 9 10 0 8 0 kqueuepl 216 8187 0 8179 89 84 5 10 0 8 4 pipepl 320 1534 0 1503 48 45 3 11 0 8 0 fdescpl 496 6623 0 6587 7 1 6 6 0 8 0 filepl 152 62110 0 61787 136 118 18 23 0 8 5 lockfpl 104 622 0 619 1 0 1 1 0 8 0 lockfspl 48 258 0 255 1 0 1 1 0 8 0 sessionpl 144 33 0 16 1 0 1 1 0 8 0 pgrppl 48 99 0 82 1 0 1 1 0 8 0 ucredpl 104 18862 0 18844 1 0 1 1 0 8 0 zombiepl 144 6588 0 6587 2 1 1 1 0 8 0 processpl 1064 6641 0 6587 5 1 4 5 0 8 0 procpl 672 20041 0 19966 22 14 8 10 0 8 0 sosppl 168 123 0 123 14 13 1 1 0 8 1 sockpl 488 14654 0 14559 288 275 13 25 0 8 1 mcl64k 65536 36 0 0 4 1 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 28 0 0 2 0 2 2 0 8 0 mcl9k 9216 12 0 0 1 0 1 1 0 8 0 mcl8k 8192 33 0 0 3 0 3 3 0 8 0 mcl4k 4096 33 0 0 3 0 3 3 0 8 0 mcl2k2 2112 8 0 0 1 0 1 1 0 8 0 mcl2k 2048 444 0 0 34 11 23 34 0 8 0 mtagpl 96 20 0 0 1 0 1 1 0 8 0 mbufpl 256 3826 0 0 216 0 216 216 0 8 0 bufpl 288 14291 0 7961 453 0 453 453 0 8 0 anonpl 24 1426029 0 1412662 225 126 99 112 0 186 0 amapchunkpl 152 132933 0 132272 124 96 28 41 0 158 0 amappl16 200 22443 0 22043 121 97 24 36 0 8 0 amappl15 192 121 0 113 1 0 1 1 0 8 0 amappl14 184 187 0 182 1 0 1 1 0 8 0 amappl13 176 153 0 151 1 0 1 1 0 8 0 amappl12 168 678 0 674 1 0 1 1 0 8 0 amappl11 160 1991 0 1965 2 0 2 2 0 8 0 amappl10 152 2047 0 2035 1 0 1 1 0 8 0 amappl9 144 1324 0 1320 1 0 1 1 0 8 0 amappl8 136 1667 0 1542 5 0 5 5 0 8 0 amappl7 128 810 0 789 1 0 1 1 0 8 0 amappl6 120 1110 0 1086 2 1 1 2 0 8 0 amappl5 112 7685 0 7659 1 0 1 1 0 8 0 amappl4 104 3031 0 2993 4 2 2 2 0 8 1 amappl3 96 20909 0 20848 2 0 2 2 0 8 0 amappl2 88 1512 0 1467 8 6 2 2 0 8 0 amappl1 80 166851 0 166088 26 8 18 19 0 8 0 amappl 88 40045 0 39852 5 0 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 6623 0 6587 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6623 0 6587 1 0 1 1 0 8 0 vmmpekpl 168 59288 0 59226 5 1 4 4 0 8 0 vmmpepl 168 662910 0 660066 268 127 141 151 0 357 5 vmsppl 368 6622 0 6587 4 0 4 4 0 8 0 rwobjpl 56 174161 0 166562 115 4 111 112 0 8 0 pdppl 4096 13253 0 13174 369 282 87 95 0 8 8 pvpl 32 2864717 0 2845977 491 316 175 238 0 265 0 pmappl 248 6622 0 6587 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1444 0 423 30 0 30 30 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(ffff800000caacc8) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd807476bba0,fffffd806ef72f00,fffffd8068ccef00,fffffd807caa1200) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd807476bba0,fffffd8068ccef00,ffff800022b78bb0,0,fffffd807caa1200,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd807476bba0,fffffd8068ccef00,ffff800022b78bb0,0,fffffd807caa1200,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000233c8550,4,ffff800022b78d30,0,ffff800022b78e20) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000233c8550,ffff800022b78dd8,ffff800022b78e20) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff800022b78ea0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff800022b78ea0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x906cba244b0, 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 end of kernel end trace frame: 0x7f7fffff4f20, count: 12 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 end of kernel end trace frame: 0x7f7fffff4f20, count: -3