panic: kernel diagnostic assertion "pr->ps_threadcnt == 0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_exit.c", line 886 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *504731 65835 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8337c983) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b6779,ffffffff833d6a1f,376,ffffffff833d6a54) at __assert+0x29 sys/kern/subr_prf.c:-1 process_zap(ffff8000fffec020) at process_zap+0x31d sys/kern/kern_exit.c:887 reaper(ffff80002a72d4c0) at reaper+0x290 sys/kern/kern_exit.c:521 end trace frame: 0x0, count: 10 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: kernel diagnostic assertion "pr->ps_threadcnt == 0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_exit.c", line 886 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8337c983) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b6779,ffffffff833d6a1f,376,ffffffff833d6a54) at __assert+0x29 sys/kern/subr_prf.c:-1 process_zap(ffff8000fffec020) at process_zap+0x31d sys/kern/kern_exit.c:887 reaper(ffff80002a72d4c0) at reaper+0x290 sys/kern/kern_exit.c:521 end trace frame: 0x0, count: -5 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002a7635e0 rbx 0x40000 acpi_pdirpa+0x2be71 rdx 0 rcx 0 rax 0xffff80002a72d4c0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x234b9b363674ab11 r11 0x3334b670c6f5e82a r12 0 r13 0 r14 0 r15 0x1 rip 0xffffffff82115c45 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a7635d0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (reaper) tid=504731 pid=65835 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a72ccf8,0xffff80002a72d768 process=0xffff8000ffffd200 user=0xffff80002a75e000, vmspace=0xffffffff839b5e00 estcpu=0, cpticks=10, pctcpu=0.0, user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 66133 65733 71203 0 2 0 syz-executor 66133 210335 71203 0 2 0x4000000 syz-executor 92205 96614 46611 0 2 0 syz-executor 92205 201729 46611 0 3 0x4000080 fsleep syz-executor 56679 83665 3196 0 2 0 syz-executor 56679 243622 3196 0 2 0x4000000 syz-executor 20710 519495 23891 0 2 0 syz-executor 20710 354166 23891 0 3 0x4000080 fsleep syz-executor 10447 166864 0 0 3 0x14280 nfsidl nfsio 62541 510275 43821 0 3 0 vmmaplk syz-executor 62541 144669 43821 0 2 0x4000000 syz-executor 12813 19030 0 0 3 0x14200 acct acct 76817 83237 18642 0 2 0 syz-executor 76817 167336 18642 0 2 0x4000000 syz-executor 76817 170177 18642 0 3 0x4000080 fsleep syz-executor 44291 309362 1 0 3 0x100083 ttyin getty 47338 232302 58250 0 3 0x82 nanoslp syz-executor 71203 190650 58250 0 3 0x2 kqpsl syz-executor 4738 429164 58250 0 3 0x82 wait syz-executor 18642 246419 58250 0 3 0x82 nanoslp syz-executor 43821 389174 58250 0 3 0x82 nanoslp syz-executor 46611 408330 58250 0 3 0x2 kqpsl syz-executor 3196 211083 58250 0 2 0x2 syz-executor 23891 213260 58250 0 2 0x2 syz-executor 58250 153661 83186 0 3 0x82 kqread syz-executor 83186 89300 22553 0 3 0x10008a sigsusp ksh 22553 433066 86975 0 3 0x98 kqread sshd-session 86975 103379 28153 0 3 0x92 kqread sshd-session 28153 87377 1 0 3 0x88 kqread sshd 75591 233222 99083 73 3 0x1100090 kqread syslogd 99083 405118 1 0 3 0x100082 sbwait syslogd 92505 122158 1 0 3 0x100080 kqread resolvd 59043 510394 9807 77 3 0x100092 kqread dhcpleased 69427 102266 9807 77 3 0x100092 kqread dhcpleased 9807 72200 1 0 3 0x80 kqread dhcpleased 16113 253717 0 0 3 0x14200 bored smr 21487 126162 0 0 2 0x14200 zerothread 62260 224048 0 0 3 0x14200 aiodoned aiodoned 65603 71303 0 0 3 0x14200 syncer update 56533 354549 0 0 3 0x14200 cleaner cleaner *65835 504731 0 0 7 0x14200 reaper 32049 432909 0 0 3 0x14200 pgdaemon pagedaemon 74191 270611 0 0 3 0x14200 bored viomb 85905 439142 0 0 3 0x40014200 acpi0 acpi0 2744 393967 0 0 3 0x14200 bored softnet0 51105 277644 0 0 3 0x14200 bored systqmp 8390 127625 0 0 3 0x14200 bored systq 42049 449034 0 0 3 0x40014200 tmoslp softclock 94353 451568 0 0 3 0x40014200 idle0 1 143183 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11046 12126K 12619K 166960K 13991 0 pcb 17 15K 16K 166960K 244 0 rtable 207 9K 10K 166960K 857 0 pf 32 13K 15K 166960K 129 0 ifaddr 36 6K 8K 166960K 109 0 ifgroup 52 2K 2K 166960K 179 0 sysctl 3 1K 9K 166960K 15 0 counters 34 17K 18K 166960K 128 0 ioctlops 0 0K 4K 166960K 247 0 iov 1 2K 16K 166960K 52 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1420 89K 90K 166960K 2299 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 6K 166960K 19 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 69 0 dirhash 12 2K 2K 166960K 39 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 97K 166960K 1119 0 sigio 0 0K 0K 166960K 22 0 proc 60 59K 124K 166960K 616 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 133 0 in_multi 75 5K 7K 166960K 160 0 ether_multi 1 0K 0K 166960K 9 0 mrt 65 4K 4K 166960K 85 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 552 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 221 150K 169K 166960K 12057 0 UVM aobj 34 12K 14K 166960K 43 0 pinsyscall 38 76K 96K 166960K 2263 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 87 0 NDP 12 0K 2K 166960K 71 0 temp 78 8672K 8744K 166960K 37404 0 kqueue 16 22K 35K 166960K 231 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 120 128 0 124 1 0 1 1 0 8 0 rtentry 136 239 0 164 4 0 4 4 0 8 0 unpcb 144 767 0 752 6 0 6 6 0 8 5 syncache 336 6 0 6 2 1 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 349 0 343 7 0 7 7 0 8 6 arp 96 24 0 12 1 0 1 1 0 8 0 ipq 40 5 0 3 1 0 1 1 0 8 0 ipqe 40 6 0 4 1 0 1 1 0 8 0 inpcb 328 1106 0 1097 8 0 8 8 0 8 6 ip6q 72 1 0 1 1 0 1 1 0 8 1 ip6af 40 2 0 2 1 0 1 1 0 8 1 nd6 112 33 0 13 1 0 1 1 0 8 0 pkpcb 40 5 0 5 1 0 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1072 75 0 75 1 0 1 1 0 8 1 pppxif 1384 42 0 42 1 0 1 1 0 8 1 pfrktable 1344 3 0 3 1 0 1 1 0 8 1 rttmr 136 7 0 7 1 0 1 1 0 8 1 art_heap8 4096 4 0 1 3 0 3 3 0 8 0 art_heap4 256 850 0 516 32 2 30 31 0 8 5 art_table 40 854 0 517 5 0 5 5 0 8 0 art_node 32 171 0 105 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 6 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 67 0 57 1 0 1 1 0 8 0 shmpl 112 32 0 6 1 0 1 1 0 8 0 dirhash 1024 35 0 18 3 0 3 3 0 8 0 dino2pl 256 3329 0 1831 95 0 95 95 0 8 0 ffsino 256 3329 0 1831 95 0 95 95 0 8 0 nchpl 144 4881 0 3182 65 1 64 64 0 8 0 rtmask 32 7 0 7 1 0 1 1 0 8 1 vnodes 216 4014 0 0 223 0 223 223 0 8 0 namei 1024 17065 0 17064 2 1 1 2 0 8 0 vcpupl 3904 5 0 0 1 0 1 1 0 8 0 vmpool 808 7 0 2 1 0 1 1 0 8 0 kstatmem 264 102 0 78 3 0 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 3 0 3 1 0 1 1 0 8 1 scxspl 216 20787 0 20787 9 1 8 8 1 8 8 plimitpl 152 187 0 171 1 0 1 1 0 8 0 sigapl 424 1434 0 1389 9 1 8 8 0 8 2 knotepl 120 40518 0 40466 30 19 11 17 0 8 7 kqueuepl 184 378 0 368 4 0 4 4 0 8 3 pipepl 304 267 0 240 7 0 7 7 0 8 4 fdescpl 448 1394 0 1365 5 1 4 5 0 8 0 filepl 120 9088 0 8877 13 1 12 12 0 8 4 lockfpl 104 290 0 287 1 0 1 1 0 8 0 lockfspl 48 133 0 130 1 0 1 1 0 8 0 sessionpl 144 26 0 18 1 0 1 1 0 8 0 pgrppl 48 52 0 36 1 0 1 1 0 8 0 ucredpl 104 1752 0 1740 1 0 1 1 0 8 0 zombiepl 144 1854 0 1852 1 0 1 1 0 8 0 processpl 1152 1434 0 1389 5 0 5 5 0 8 0 procpl 664 2975 0 2923 8 1 7 7 0 8 1 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 552 2070 0 2042 12 1 11 12 0 8 8 mcl64k 65536 52 0 52 2 1 1 1 0 8 1 mcl16k 16384 5 0 5 2 1 1 1 0 8 1 mcl9k 9216 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 22 0 22 2 1 1 1 0 8 1 mcl4k 4096 3744 0 3694 14 6 8 13 0 8 1 mcl2k 2048 1743 0 1738 16 7 9 12 0 8 8 mtagpl 96 30 0 17 1 0 1 1 0 8 0 mbufpl 256 16705 0 16520 23 0 23 23 0 8 6 bufpl 280 7706 0 1485 445 0 445 445 0 8 0 anonpl 24 233795 0 227770 56 11 45 45 0 187 8 amapchunkpl 152 39866 0 39410 37 4 33 33 0 158 12 amappl16 200 4972 0 4758 26 14 12 15 0 8 0 amappl15 192 10 0 8 1 0 1 1 0 8 0 amappl14 184 2 0 2 1 1 0 1 0 8 0 amappl13 176 435 0 433 1 0 1 1 0 8 0 amappl12 168 1752 0 1714 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 50 0 40 1 0 1 1 0 8 0 amappl9 144 271 0 271 1 1 0 1 0 8 0 amappl8 136 24 0 23 1 0 1 1 0 8 0 amappl7 128 91 0 89 1 0 1 1 0 8 0 amappl6 120 290 0 279 1 0 1 1 0 8 0 amappl5 112 73 0 65 1 0 1 1 0 8 0 amappl4 104 403 0 378 1 0 1 1 0 8 0 amappl3 96 6832 0 6745 3 0 3 3 0 8 0 amappl2 88 1522 0 1450 2 0 2 2 0 8 0 amappl1 80 13380 0 12840 14 1 13 13 0 8 0 amappl 88 11139 0 10985 5 0 5 5 0 92 0 uvmvnodes 80 128 0 0 3 0 3 3 0 8 0 dma4096 4096 2 0 2 2 1 1 1 0 8 1 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 42 0 9 1 0 1 1 0 8 0 uaddrrnd 24 1394 0 1365 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1394 0 1365 1 0 1 1 0 8 0 vmmpekpl 168 12387 0 12347 4 0 4 4 0 8 1 vmmpepl 168 94261 0 92288 92 0 92 92 0 357 3 vmsppl 368 1393 0 1364 4 1 3 4 0 8 0 rwobjpl 40 26991 0 25809 13 0 13 13 0 8 0 pdppl 4096 2809 0 2737 108 36 72 83 0 8 0 pvpl 32 624969 0 612373 134 17 117 117 0 265 14 pmappl 216 1400 0 1366 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 421 0 60 11 0 11 11 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:438 panic(ffffffff8337c983) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b6779,ffffffff833d6a1f,376,ffffffff833d6a54) at __assert+0x29 sys/kern/subr_prf.c:-1 process_zap(ffff8000fffec020) at process_zap+0x31d sys/kern/kern_exit.c:887 reaper(ffff80002a72d4c0) at reaper+0x290 sys/kern/kern_exit.c:521 end trace frame: 0x0, count: -5 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8337c983) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b6779,ffffffff833d6a1f,376,ffffffff833d6a54) at __assert+0x29 sys/kern/subr_prf.c:-1 process_zap(ffff8000fffec020) at process_zap+0x31d sys/kern/kern_exit.c:887 reaper(ffff80002a72d4c0) at reaper+0x290 sys/kern/kern_exit.c:521 end trace frame: 0x0, count: -5