panic: mutex 0xffffffff839ca6c8 not held in in_pcb_iterator Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 51724 87400 32767 0x10 0x4000000 1 syz-executor 72011 47686 32767 0x10 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833ec5b0) at panic+0x1e5 sys/kern/subr_prf.c:198 in_pcb_iterator(ffffffff839ca6c8,fffffd80656d9e20,ffff80003c47ad70) at in_pcb_iterator+0x21d sys/netinet/in_pcb.c:683 sysctl_file(ffff80003c47b038,4,200000000100,ffff80003c47b068,ffff80002a296ce8) at sysctl_file+0x18d2 sys/kern/kern_sysctl.c:-1 kern_sysctl(ffff80003c47b034,5,200000000100,ffff80003c47b068,0,ffffffffffffff67,81d20b6e02eae9fe) at kern_sysctl+0x251 sys/kern/kern_sysctl.c:526 sys_sysctl(ffff80002a296ce8,ffff80003c47b1a0,ffff80003c47b0f0) at sys_sysctl+0x3f2 sys/kern/kern_sysctl.c:-1 syscall(ffff80003c47b1a0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c47b1a0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x80654c85d70, count: 7 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 *cpu1: mutex 0xffffffff839ca6c8 not held in in_pcb_iterator ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833ec5b0) at panic+0x1e5 sys/kern/subr_prf.c:198 in_pcb_iterator(ffffffff839ca6c8,fffffd80656d9e20,ffff80003c47ad70) at in_pcb_iterator+0x21d sys/netinet/in_pcb.c:683 sysctl_file(ffff80003c47b038,4,200000000100,ffff80003c47b068,ffff80002a296ce8) at sysctl_file+0x18d2 sys/kern/kern_sysctl.c:-1 kern_sysctl(ffff80003c47b034,5,200000000100,ffff80003c47b068,0,ffffffffffffff67,81d20b6e02eae9fe) at kern_sysctl+0x251 sys/kern/kern_sysctl.c:526 sys_sysctl(ffff80002a296ce8,ffff80003c47b1a0,ffff80003c47b0f0) at sys_sysctl+0x3f2 sys/kern/kern_sysctl.c:-1 syscall(ffff80003c47b1a0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c47b1a0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x80654c85d70, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c47ac30 rbx 0xffff8000299dedd7 rdx 0 rcx 0xffff80002a296ce8 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xc58954382b7beebc r11 0x51544bd1039d4215 r12 0xffff8000299debd8 r13 0 r14 0 r15 0x1 rip 0xffffffff81a737d5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c47ac20 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=51724 pid=87400 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=36, usrpri=86, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff1c50,0xffff80003c43fc68 process=0xffff800038c13568 user=0xffff80003c476000, vmspace=0xfffffd806c3025c8 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 87400 370574 71962 32767 3 0x90 nanoslp syz-executor *87400 51724 71962 32767 7 0x4000010 syz-executor 87400 34917 71962 32767 3 0x4000090 fsleep syz-executor 87400 278579 71962 32767 3 0x4000090 fsleep syz-executor 67163 137399 95720 32767 2 0x10 syz-executor 67163 439739 95720 32767 3 0x4000090 fsleep syz-executor 47863 159843 38019 32767 2 0x4000010 syz-executor 47863 148899 38019 32767 3 0x4000090 kqread syz-executor 47863 264649 38019 32767 3 0x4000090 kqread syz-executor 47686 221879 72076 32767 2 0x10 syz-executor 47686 72011 72076 32767 7 0x4000010 syz-executor 8373 191125 0 0 3 0x14200 bored sosplice 56153 476007 58982 32767 3 0x90 nanoslp syz-executor 56153 93640 58982 32767 3 0x4000090 kqpoll syz-executor 56153 176363 58982 32767 3 0x4000090 fsleep syz-executor 35720 448395 14040 32767 3 0x90 nanoslp syz-executor 35720 245635 14040 32767 3 0x4000090 kqread syz-executor 35720 348604 14040 32767 3 0x4000090 fsleep syz-executor 82575 401203 98647 32767 3 0x90 nanoslp syz-executor 82575 357550 98647 32767 3 0x4000090 sbwait syz-executor 82575 491365 98647 32767 3 0x4000090 fsleep syz-executor 18865 479450 67216 32767 3 0x90 nanoslp syz-executor 18865 408103 67216 32767 3 0x4000090 kqsel syz-executor 18865 461944 67216 32767 3 0x4000090 fsleep syz-executor 58982 149314 76143 32767 3 0x90 nanoslp syz-executor 14040 15935 46867 32767 3 0x90 nanoslp syz-executor 72076 476744 29888 32767 3 0x90 nanoslp syz-executor 98647 4673 45031 32767 3 0x90 nanoslp syz-executor 71962 474228 13171 32767 3 0x90 nanoslp syz-executor 67216 393852 33352 32767 3 0x90 nanoslp syz-executor 95720 404211 92606 32767 3 0x90 nanoslp syz-executor 38019 192299 6886 32767 3 0x90 nanoslp syz-executor 76143 207626 61743 0 3 0x82 wait syz-executor 29888 61756 61743 0 3 0x82 wait syz-executor 45031 141267 61743 0 3 0x82 wait syz-executor 46867 152794 61743 0 3 0x82 wait syz-executor 6886 48929 61743 0 3 0x82 wait syz-executor 92606 176195 61743 0 3 0x82 wait syz-executor 33352 314568 61743 0 3 0x82 wait syz-executor 13171 432733 61743 0 3 0x82 wait syz-executor 61743 338362 81814 0 3 0x82 kqread syz-executor 81814 459240 10892 0 3 0x10008a sigsusp ksh 10892 52414 86498 0 3 0x98 kqread sshd-session 86498 171101 59191 0 3 0x92 kqread sshd-session 18459 295335 1 0 3 0x100083 ttyin getty 59191 67666 1 0 3 0x88 kqread sshd 50356 463034 7705 73 3 0x1100090 kqread syslogd 7705 433785 1 0 3 0x100082 sbwait syslogd 19705 81767 1 0 3 0x100080 kqread resolvd 47533 58102 1852 77 3 0x100092 kqread dhcpleased 71089 51681 1852 77 3 0x100092 kqread dhcpleased 1852 128760 1 0 3 0x80 kqread dhcpleased 32775 489257 0 0 3 0x14200 bored smr 18826 360768 0 0 2 0x14200 zerothread 69478 45153 0 0 3 0x14200 aiodoned aiodoned 50094 33402 0 0 3 0x14200 syncer update 47642 225071 0 0 3 0x14200 cleaner cleaner 93081 235207 0 0 3 0x14200 reaper reaper 2553 326087 0 0 3 0x14200 pgdaemon pagedaemon 90696 451550 0 0 3 0x14200 bored viomb 50154 124542 0 0 3 0x40014200 acpi0 acpi0 93412 471605 0 0 3 0x40014200 idle1 18859 432539 0 0 3 0x14200 bored softnet3 26588 485915 0 0 3 0x14200 bored softnet2 75376 176291 0 0 3 0x14200 bored softnet1 80802 114933 0 0 3 0x14200 bored softnet0 55957 265800 0 0 3 0x14200 bored systqmp 44141 407684 0 0 3 0x14200 bored systq 84586 175291 0 0 3 0x14200 tmoslp softclockmp 91742 33684 0 0 3 0x40014200 tmoslp softclock 9003 177980 0 0 3 0x40014200 idle0 1 502555 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 87400 (syz-executor) thread 0xffff80002a296ce8 (51724) shared rwlock netlock r = 0 (0xffffffff83805e30) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x36e sys/kern/kern_rwlock.c:397 #2 sysctl_file+0x190c sys/kern/kern_sysctl.c:1769 #3 kern_sysctl+0x251 sys/kern/kern_sysctl.c:526 #4 sys_sysctl+0x3f2 sys/kern/kern_sysctl.c:-1 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 #6 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10191 10955K 10966K 166960K 11268 0 pcb 17 12K 12K 166960K 17 0 rtable 234 6K 6K 166960K 348 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 1 1K 9K 166960K 5 0 counters 68 36K 36K 166960K 68 0 ioctlops 0 0K 2K 166960K 30 0 iov 0 0K 12K 166960K 5 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1360 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 4 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 26 97K 121K 166960K 194 0 sigio 0 0K 0K 166960K 2 0 proc 58 79K 103K 166960K 473 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 8 0 in_multi 99 7K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 340 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 273 168K 178K 166960K 3233 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 47 94K 110K 166960K 1191 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 7 0 NDP 13 0K 2K 166960K 27 0 temp 39 8687K 8747K 166960K 3852 0 kqueue 18 28K 28K 166960K 38 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 105 0 102 3 0 3 3 0 8 2 rtentry 176 111 0 1 5 0 5 5 0 8 0 unpcb 144 87 0 63 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 808 24 0 15 1 0 1 1 0 8 0 arp 128 18 0 0 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 328 101 0 86 2 0 2 2 0 8 0 nd6 144 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 256 453 0 0 29 0 29 29 0 8 0 art_table 32 454 0 0 4 0 4 4 0 8 0 art_node 16 110 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 40 0 40 1 0 1 1 0 8 1 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 2 0 0 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1621 0 114 95 0 95 95 0 8 0 ffsino 288 1621 0 114 108 0 108 108 0 8 0 nchpl 144 1885 0 205 63 0 63 63 0 8 0 uvmvnodes 80 1702 0 0 35 0 35 35 0 8 0 vnodes 216 1702 0 0 95 0 95 95 0 8 0 namei 1024 5518 0 5518 3 1 2 2 0 8 2 percpumem 16 49 0 0 1 0 1 1 0 8 0 kstatmem 264 24 0 0 2 0 2 2 0 8 0 scxspl 216 6240 0 6240 10 2 8 8 1 8 8 plimitpl 152 44 0 16 2 0 2 2 0 8 0 sigapl 424 466 0 409 7 0 7 7 0 8 0 knotepl 120 536 0 0 17 0 17 17 0 8 0 kqueuepl 224 45 0 26 2 0 2 2 0 8 0 pipepl 336 100 0 73 4 1 3 3 0 8 0 fdescpl 520 447 0 409 3 0 3 3 0 8 0 filepl 160 1717 0 1473 12 0 12 12 0 8 1 lockfpl 104 20 0 16 1 0 1 1 0 8 0 lockfspl 48 12 0 8 1 0 1 1 0 8 0 sessionpl 144 22 0 6 1 0 1 1 0 8 0 pgrppl 48 31 0 7 1 0 1 1 0 8 0 ucredpl 104 183 0 164 1 0 1 1 0 8 0 zombiepl 144 409 0 409 2 1 1 1 0 8 1 processpl 1240 466 0 409 5 0 5 5 0 8 0 procpl 656 560 0 488 6 0 6 6 0 8 0 sosppl 168 2 0 2 1 0 1 1 0 8 1 sockpl 728 294 0 249 10 0 10 10 0 8 5 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 112 0 0 14 0 14 14 0 8 0 mcl2k 2048 13 0 0 2 0 2 2 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 275 0 0 18 0 18 18 0 8 0 bufpl 280 2289 0 115 156 0 156 156 0 8 0 anonpl 32 5308 0 0 43 0 43 43 0 246 0 amapchunkpl 152 9367 0 8739 30 1 29 29 0 158 4 amappl16 200 1807 0 1783 5 0 5 5 0 8 3 amappl15 192 5 0 5 2 1 1 1 0 8 1 amappl14 184 123 0 113 1 0 1 1 0 8 0 amappl13 176 5 0 5 1 0 1 1 0 8 1 amappl12 168 1039 0 1001 2 0 2 2 0 8 0 amappl11 160 48 0 38 1 0 1 1 0 8 0 amappl10 152 18 0 18 2 1 1 1 0 8 1 amappl9 144 245 0 245 2 1 1 1 0 8 1 amappl8 136 18 0 17 1 0 1 1 0 8 0 amappl7 128 108 0 98 1 0 1 1 0 8 0 amappl6 120 172 0 169 2 1 1 1 0 8 0 amappl5 112 176 0 170 1 0 1 1 0 8 0 amappl4 104 284 0 268 1 0 1 1 0 8 0 amappl3 96 1512 0 1368 4 0 4 4 0 8 0 amappl2 88 594 0 542 2 0 2 2 0 8 0 amappl1 80 8129 0 7548 15 1 14 14 0 8 0 amappl 88 2604 0 2397 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 447 0 409 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 447 0 409 1 0 1 1 0 8 0 vmmpekpl 168 5192 0 5165 2 0 2 2 0 8 0 vmmpepl 168 35047 0 32877 100 5 95 95 0 357 0 vmsppl 480 446 0 409 7 1 6 6 0 8 0 rwobjpl 72 14027 0 11454 47 0 47 47 0 8 0 pdppl 4096 901 0 818 113 26 87 95 0 8 4 pvpl 32 13321 0 0 108 0 108 108 0 265 0 pmappl 256 446 0 409 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 401 0 31 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83859ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff839595f8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:129 [inline] __mp_lock(ffffffff839595f8) at __mp_lock+0x192 sys/kern/kern_lock.c:160 doopenat(ffff80003c43f738,ffffff9c,200000000740,8000,0,ffff800037ffc590) at doopenat+0x314 sys/kern/vfs_syscalls.c:1137 syscall(ffff800037ffc640) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800037ffc640) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe509231e840, count: 8 ddb{0}> trace x86_ipi_db(ffffffff83859ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff839595f8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:129 [inline] __mp_lock(ffffffff839595f8) at __mp_lock+0x192 sys/kern/kern_lock.c:160 doopenat(ffff80003c43f738,ffffff9c,200000000740,8000,0,ffff800037ffc590) at doopenat+0x314 sys/kern/vfs_syscalls.c:1137 syscall(ffff800037ffc640) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800037ffc640) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe509231e840, count: -7 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833ec5b0) at panic+0x1e5 sys/kern/subr_prf.c:198 in_pcb_iterator(ffffffff839ca6c8,fffffd80656d9e20,ffff80003c47ad70) at in_pcb_iterator+0x21d sys/netinet/in_pcb.c:683 sysctl_file(ffff80003c47b038,4,200000000100,ffff80003c47b068,ffff80002a296ce8) at sysctl_file+0x18d2 sys/kern/kern_sysctl.c:-1 kern_sysctl(ffff80003c47b034,5,200000000100,ffff80003c47b068,0,ffffffffffffff67,81d20b6e02eae9fe) at kern_sysctl+0x251 sys/kern/kern_sysctl.c:526 sys_sysctl(ffff80002a296ce8,ffff80003c47b1a0,ffff80003c47b0f0) at sys_sysctl+0x3f2 sys/kern/kern_sysctl.c:-1 syscall(ffff80003c47b1a0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c47b1a0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x80654c85d70, count: 7 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833ec5b0) at panic+0x1e5 sys/kern/subr_prf.c:198 in_pcb_iterator(ffffffff839ca6c8,fffffd80656d9e20,ffff80003c47ad70) at in_pcb_iterator+0x21d sys/netinet/in_pcb.c:683 sysctl_file(ffff80003c47b038,4,200000000100,ffff80003c47b068,ffff80002a296ce8) at sysctl_file+0x18d2 sys/kern/kern_sysctl.c:-1 kern_sysctl(ffff80003c47b034,5,200000000100,ffff80003c47b068,0,ffffffffffffff67,81d20b6e02eae9fe) at kern_sysctl+0x251 sys/kern/kern_sysctl.c:526 sys_sysctl(ffff80002a296ce8,ffff80003c47b1a0,ffff80003c47b0f0) at sys_sysctl+0x3f2 sys/kern/kern_sysctl.c:-1 syscall(ffff80003c47b1a0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c47b1a0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x80654c85d70, count: -8