panic: assertwaitok: non-zero mutex count: 2 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *248983 81514 0 0x1000 0x4080000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82ff7797) at panic+0x1cf sys/kern/subr_prf.c:198 assertwaitok() at assertwaitok+0x16f sys/kern/subr_xxx.c:163 mi_switch() at mi_switch+0x2b6 sys/kern/sched_bsd.c:412 yield() at yield+0x61 sys/kern/sched_bsd.c:320 pool_get(ffffffff83575180,1) at pool_get+0x1e9 sys/kern/subr_pool.c:589 m_copym(fffffd805b220100,0,1,1) at m_copym+0x1f5 sys/kern/uipc_mbuf.c:653 somove(fffffd8070d28008,1) at somove+0xd0d sys/kern/uipc_socket.c:1803 sosplice(fffffd8070d28008,4,1,fffffd806c4aea30) at sosplice+0x88c sys/kern/uipc_socket.c:1510 sys_setsockopt(ffff80002a4d02b8,ffff800037417220,ffff800037417170) at sys_setsockopt+0x2b9 sys/kern/uipc_syscalls.c:1231 syscall(ffff800037417220) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x36c44b0e380, count: 3 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: assertwaitok: non-zero mutex count: 2 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82ff7797) at panic+0x1cf sys/kern/subr_prf.c:198 assertwaitok() at assertwaitok+0x16f sys/kern/subr_xxx.c:163 mi_switch() at mi_switch+0x2b6 sys/kern/sched_bsd.c:412 yield() at yield+0x61 sys/kern/sched_bsd.c:320 pool_get(ffffffff83575180,1) at pool_get+0x1e9 sys/kern/subr_pool.c:589 m_copym(fffffd805b220100,0,1,1) at m_copym+0x1f5 sys/kern/uipc_mbuf.c:653 somove(fffffd8070d28008,1) at somove+0xd0d sys/kern/uipc_socket.c:1803 sosplice(fffffd8070d28008,4,1,fffffd806c4aea30) at sosplice+0x88c sys/kern/uipc_socket.c:1510 sys_setsockopt(ffff80002a4d02b8,ffff800037417220,ffff800037417170) at sys_setsockopt+0x2b9 sys/kern/uipc_syscalls.c:1231 syscall(ffff800037417220) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x36c44b0e380, count: -12 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800037416d20 rbx 0 rdx 0 rcx 0 rax 0xffff80002a4d02b8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x6b1ef490f15f09f3 r11 0xe46e4dcae55c8204 r12 0 r13 0 r14 0 r15 0x1 rip 0xffffffff812c4455 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800037416d10 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=248983 pid=81514 tcnt=2 stat=onproc flags process=1000 proc=4080000 runpri=79, usrpri=79, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a4d0cd8 scnt=1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a4b0a30,0xffff80002a4d0ce8 process=0xffff80002a465570 user=0xffff800037412000, vmspace=0xfffffd8070217008 estcpu=29, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 23201 73305 67829 0 2 0 syz-executor 23201 346896 67829 0 3 0x4000080 fsleep syz-executor 14732 453739 3246 0 2 0 syz-executor 14732 103400 3246 0 3 0x4000080 fsleep syz-executor 42825 143125 67762 0 2 0 syz-executor 42825 462622 67762 0 3 0x4000080 fsleep syz-executor 42432 260418 17202 0 3 0x82 netio sshd-session 15938 211057 17202 0 3 0x82 netio sshd-session 17762 207778 66285 0 2 0 syz-executor 17762 329800 66285 0 3 0x4000080 fsleep syz-executor 40714 214579 27810 0 2 0 syz-executor 40714 37759 27810 0 3 0x4000080 fsleep syz-executor 40714 70843 27810 0 3 0x4000080 fsleep syz-executor *81514 248983 12557 0 7 0x4081000 syz-executor 81514 68327 12557 0 3 0x4003000 suspend syz-executor 4145 110280 92357 0 3 0x3000 suspend syz-executor 4145 223328 92357 0 2 0x4081000 syz-executor 92837 440005 0 0 3 0x14200 acct acct 66285 191486 58856 0 3 0x82 nanoslp syz-executor 74033 468971 58856 0 3 0x82 nanoslp syz-executor 67829 59405 58856 0 3 0x82 nanoslp syz-executor 27810 318452 58856 0 3 0x82 nanoslp syz-executor 67762 146383 58856 0 3 0x82 nanoslp syz-executor 3246 116377 58856 0 3 0x82 nanoslp syz-executor 92357 124882 58856 0 3 0x82 wait syz-executor 12557 77912 58856 0 3 0x82 wait syz-executor 60746 321411 0 0 3 0x14200 bored sosplice 58856 158044 15724 0 3 0x82 kqread syz-executor 15724 60400 71400 0 3 0x10008a sigsusp ksh 71400 198228 46385 0 3 0x98 kqread sshd-session 46385 210911 17202 0 3 0x92 kqread sshd-session 74373 306181 1 0 3 0x100083 ttyin getty 17202 388196 1 0 3 0x88 kqread sshd 39974 410140 83059 73 3 0x1100010 biowait syslogd 83059 502520 1 0 3 0x100082 sbwait syslogd 66284 489299 1 0 3 0x100080 kqread resolvd 59309 324213 31093 77 3 0x100092 kqread dhcpleased 90954 202396 31093 77 3 0x100092 kqread dhcpleased 31093 257436 1 0 3 0x80 kqread dhcpleased 19442 217305 0 0 3 0x14200 bored smr 70546 111397 0 0 2 0x14200 zerothread 47701 67620 0 0 3 0x14200 aiodoned aiodoned 95192 373851 0 0 3 0x14200 syncer update 11667 175035 0 0 3 0x14200 cleaner cleaner 68872 184313 0 0 3 0x14200 reaper reaper 68611 199552 0 0 3 0x14200 pgdaemon pagedaemon 93265 99972 0 0 3 0x14200 bored viomb 85620 368102 0 0 3 0x40014200 acpi0 acpi0 56297 418746 0 0 3 0x14200 bored softnet3 386 57111 0 0 3 0x14200 bored softnet2 70351 68962 0 0 3 0x14200 bored softnet1 77612 499580 0 0 3 0x14200 bored softnet0 94925 442805 0 0 3 0x14200 bored systqmp 11697 205386 0 0 3 0x14200 bored systq 40851 327302 0 0 3 0x40014200 tmoslp softclock 96935 363145 0 0 3 0x40014200 idle0 1 60742 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10211 11063K 11525K 166960K 12145 0 pcb 17 15K 16K 166960K 275 0 rtable 226 7K 8K 166960K 1434 0 pf 38 14K 18K 166960K 127 0 ifaddr 44 8K 8K 166960K 195 0 ifgroup 56 2K 2K 166960K 207 0 sysctl 2 0K 1K 166960K 3 0 counters 32 17K 17K 166960K 73 0 ioctlops 0 0K 4K 166960K 140 0 iov 0 0K 32K 166960K 47 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1506 95K 95K 166960K 2411 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 16 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 23 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 97K 166960K 1181 0 sigio 0 0K 0K 166960K 11 0 proc 60 59K 124K 166960K 1470 0 subproc 104 6K 7K 166960K 560 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 126 0 in_multi 99 7K 7K 166960K 494 0 ether_multi 1 0K 0K 166960K 5 0 mrt 0 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 247 1102K 1102K 166960K 247 0 exec 0 0K 1K 166960K 885 0 pfkey data 0 0K 4K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 250 73K 90K 166960K 10428 0 UVM aobj 59 4K 4K 166960K 61 0 pinsyscall 43 86K 102K 166960K 3067 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 29 0 NDP 13 0K 2K 166960K 138 0 temp 58 6811K 6888K 166960K 48535 0 kqueue 13 20K 32K 166960K 127 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 179 0 176 2 1 1 2 0 8 0 rtentry 112 503 0 400 4 1 3 4 0 8 0 unpcb 144 592 0 574 5 3 2 4 0 8 1 syncache 336 8 0 8 2 1 1 1 0 8 1 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 808 148 0 136 3 1 2 2 0 8 0 arp 88 86 0 68 1 0 1 1 0 8 0 ipq 40 4 0 1 1 0 1 1 0 8 0 ipqe 40 50 0 46 1 0 1 1 0 8 0 inpcb 336 1010 0 992 12 5 7 7 0 8 5 nd6 104 135 0 109 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 43 0 35 1 0 1 1 0 8 0 ppxss 1072 8 0 7 2 1 1 1 0 8 0 pfstscr 40 3 0 3 2 1 1 1 0 8 1 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pfstitem 24 4 0 0 1 0 1 1 0 8 0 pfstkey 128 10 0 6 1 0 1 1 0 8 0 pfstate 344 5 0 3 1 0 1 1 0 8 0 pfrule 1344 6 0 5 2 1 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2071 0 1620 30 1 29 30 0 8 0 art_table 32 2072 0 1620 4 0 4 4 0 8 0 art_node 16 500 0 408 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 20 0 10 1 0 1 1 0 8 0 shmpl 112 58 0 2 2 0 2 2 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2659 0 1096 99 0 99 99 0 8 0 ffsino 240 2659 0 1096 93 0 93 93 0 8 0 nchpl 144 3662 0 1935 65 0 65 65 0 8 0 uvmvnodes 80 3574 0 0 73 0 73 73 0 8 0 vnodes 216 3574 0 0 199 0 199 199 0 8 0 namei 1024 15801 0 15801 3 2 1 2 0 8 1 kstatmem 264 108 0 82 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 28628 0 28627 10 7 3 8 1 8 2 plimitpl 152 316 0 300 1 0 1 1 0 8 0 sigapl 424 1393 0 1343 7 1 6 7 0 8 0 futexpl 64 9144 0 9138 1 0 1 1 0 8 0 knotepl 120 21228 0 21179 17 7 10 10 0 8 8 kqueuepl 184 219 0 209 2 1 1 2 0 8 0 pipepl 288 250 0 221 3 0 3 3 0 8 0 fdescpl 432 1375 0 1343 5 1 4 5 0 8 0 filepl 120 7304 0 7039 16 6 10 15 0 8 0 lockfpl 104 343 0 341 2 1 1 2 0 8 0 lockfspl 48 89 0 87 1 0 1 1 0 8 0 sessionpl 144 57 0 47 1 0 1 1 0 8 0 pgrppl 48 112 0 94 1 0 1 1 0 8 0 ucredpl 104 1168 0 1157 1 0 1 1 0 8 0 zombiepl 144 1452 0 1450 2 1 1 1 0 8 0 processpl 1096 1393 0 1343 4 0 4 4 0 8 0 procpl 648 2284 0 2225 7 1 6 6 0 8 0 sosppl 168 2 0 0 1 0 1 1 0 8 0 sockpl 504 1791 0 1752 21 9 12 14 0 8 6 mcl64k 65536 6 0 6 2 1 1 1 0 8 1 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl9k 9216 2 0 2 2 1 1 1 0 8 1 mcl8k 8192 11 0 11 2 1 1 1 0 8 1 mcl4k 4096 3423 0 3369 14 6 8 14 0 8 0 mcl2k 2048 1506 0 1501 5 3 2 4 0 8 1 mtagpl 96 27 0 21 1 0 1 1 0 8 0 mbufpl 256 15369 0 15171 133 111 22 75 0 8 8 bufpl 280 8660 0 1347 523 0 523 523 0 8 0 anonpl 24 237129 0 233368 83 38 45 74 0 187 8 amapchunkpl 152 34050 0 33519 50 20 30 39 0 158 9 amappl16 200 4386 0 4358 26 12 14 14 0 8 8 amappl15 192 54 0 54 1 1 0 1 0 8 0 amappl14 184 176 0 164 1 0 1 1 0 8 0 amappl13 176 9 0 9 1 1 0 1 0 8 0 amappl12 168 2510 0 2478 3 1 2 3 0 8 0 amappl11 160 72 0 62 1 0 1 1 0 8 0 amappl10 152 10 0 10 1 1 0 1 0 8 0 amappl9 144 128 0 128 1 1 0 1 0 8 0 amappl8 136 47 0 46 1 0 1 1 0 8 0 amappl7 128 176 0 162 1 0 1 1 0 8 0 amappl6 120 492 0 490 1 0 1 1 0 8 0 amappl5 112 261 0 250 1 0 1 1 0 8 0 amappl4 104 390 0 373 1 0 1 1 0 8 0 amappl3 96 6494 0 6374 4 0 4 4 0 8 0 amappl2 88 1152 0 1075 2 0 2 2 0 8 0 amappl1 80 13064 0 12368 17 2 15 15 0 8 0 amappl 88 9746 0 9561 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 3 0 2 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 7 0 7 1 1 0 1 0 8 0 dma128 128 255 0 255 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 60 0 2 2 0 2 2 0 8 0 uaddrrnd 24 1375 0 1343 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1375 0 1343 1 0 1 1 0 8 0 vmmpekpl 168 12148 0 12105 3 0 3 3 0 8 0 vmmpepl 168 91359 0 89288 93 2 91 91 0 357 0 vmsppl 344 1374 0 1343 4 1 3 4 0 8 0 rwobjpl 24 31554 0 26851 29 0 29 29 0 8 0 pdppl 4096 2757 0 2686 151 80 71 83 0 8 0 pvpl 32 686458 0 674869 268 149 119 258 0 265 7 pmappl 216 1374 0 1343 3 1 2 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 582 0 225 13 0 13 13 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82ff7797) at panic+0x1cf sys/kern/subr_prf.c:198 assertwaitok() at assertwaitok+0x16f sys/kern/subr_xxx.c:163 mi_switch() at mi_switch+0x2b6 sys/kern/sched_bsd.c:412 yield() at yield+0x61 sys/kern/sched_bsd.c:320 pool_get(ffffffff83575180,1) at pool_get+0x1e9 sys/kern/subr_pool.c:589 m_copym(fffffd805b220100,0,1,1) at m_copym+0x1f5 sys/kern/uipc_mbuf.c:653 somove(fffffd8070d28008,1) at somove+0xd0d sys/kern/uipc_socket.c:1803 sosplice(fffffd8070d28008,4,1,fffffd806c4aea30) at sosplice+0x88c sys/kern/uipc_socket.c:1510 sys_setsockopt(ffff80002a4d02b8,ffff800037417220,ffff800037417170) at sys_setsockopt+0x2b9 sys/kern/uipc_syscalls.c:1231 syscall(ffff800037417220) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x36c44b0e380, count: -12 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82ff7797) at panic+0x1cf sys/kern/subr_prf.c:198 assertwaitok() at assertwaitok+0x16f sys/kern/subr_xxx.c:163 mi_switch() at mi_switch+0x2b6 sys/kern/sched_bsd.c:412 yield() at yield+0x61 sys/kern/sched_bsd.c:320 pool_get(ffffffff83575180,1) at pool_get+0x1e9 sys/kern/subr_pool.c:589 m_copym(fffffd805b220100,0,1,1) at m_copym+0x1f5 sys/kern/uipc_mbuf.c:653 somove(fffffd8070d28008,1) at somove+0xd0d sys/kern/uipc_socket.c:1803 sosplice(fffffd8070d28008,4,1,fffffd806c4aea30) at sosplice+0x88c sys/kern/uipc_socket.c:1510 sys_setsockopt(ffff80002a4d02b8,ffff800037417220,ffff800037417170) at sys_setsockopt+0x2b9 sys/kern/uipc_syscalls.c:1231 syscall(ffff800037417220) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x36c44b0e380, count: -12