uvm_fault(0xffff800001c7d9a8, 0x8, 0, 1) -> e kernel: page fault trap, code=0 Stopped at knote_processfork+0x287: movq 0x8(%r15),%r14 TID PID UID PRFLAGS PFLAGS CPU COMMAND 121759 45955 0 0 0x4000001 0 syz-executor *497355 45955 0 0 0x4000000 1K syz-executor knote_processfork(ffffffff85d370e0,ed10) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff800039afad20) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff800039afaf28,1,0,ffff800039afaf00,200000000200,0,ffff800039afb180) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff8000298f3a08,ffff800039afb180,ffff800039afb0e0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff800039afb180) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039afb180) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x413ca701a40, 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: uvm_fault(0xffff800001c7d9a8, 0x8, 0, 1) -> e ddb{1}> show kasan kasan: no report recorded this boot ddb{1}> trace knote_processfork(ffffffff85d370e0,ed10) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff800039afad20) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff800039afaf28,1,0,ffff800039afaf00,200000000200,0,ffff800039afb180) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff8000298f3a08,ffff800039afb180,ffff800039afb0e0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff800039afb180) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039afb180) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x413ca701a40, count: -8 ddb{1}> show registers rdi 0x8 rsi 0x1 rbp 0xffff800039afabf0 rbx 0xffff800001c028b2 rdx 0 rcx 0xffff800028fe3ff0 rax 0x1 r8 0x8 r9 0x1 r10 0 r11 0xffffffff8301f780 filt_proc r12 0xffff800039afaaa0 r13 0xffff800039afaaa0 r14 0xffffffff85d37220 process0+0x140 r15 0 rip 0xffffffff8302db97 knote_processfork+0x287 cs 0x8 rflags 0x10286 __ALIGN_SIZE+0xf286 rsp 0xffff800039afaa40 ss 0x10 knote_processfork+0x287: movq 0x8(%r15),%r14 ddb{1}> show proc PROC (syz-executor) tid=497355 pid=45955 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000298f2a78,0xffff80003b73a7f8 process=0xffff8000298a5348 user=0xffff800039af0000, vmspace=0xffff800001c7d9a8 estcpu=34, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 60688 515037 0 0 2 0x14000 0x200 swapper 45027 445098 97777 0 2 0 0 syz-executor 10830 31303 5503 0 2 0x40 0 syz-executor 6536 235443 35489 0 2 0 0 syz-executor 6536 197967 35489 0 3 0 0x4000080 fsleep syz-executor 45955 228422 90447 0 2 0 0 syz-executor 45955 121759 90447 0 7 0 0x4000001 syz-executor 45955 368482 90447 0 2 0 0x4000080 syz-executor *45955 497355 90447 0 7 0 0x4000000 syz-executor 5503 471818 27419 0 3 0x82 0 ppwait syz-executor 69712 412718 27419 0 3 0x2 0x80 piperd syz-executor 35489 369217 27419 0 3 0x2 0x80 nanoslp syz-executor 97777 186317 27419 0 3 0x2 0x80 nanoslp syz-executor 90447 172631 27419 0 3 0x2 0x80 nanoslp syz-executor 84750 353377 27419 0 3 0x2 0x80 piperd syz-executor 27419 317458 20448 0 2 0x2 0 syz-executor 20448 309412 41670 0 3 0x100002 0x88 sigsusp ksh 41670 372640 98629 0 3 0x10 0x88 kqread sshd-session 98629 13887 12745 0 3 0x12 0x80 kqread sshd-session 30018 397061 1 0 3 0x100003 0x80 ttyin getty 12745 461255 1 0 3 0 0x88 kqread sshd 39329 406792 11896 74 3 0x1100012 0x80 bpf pflogd 11896 273318 1 0 3 0 0x80 sbwait pflogd 23463 475081 72192 73 3 0x1100010 0x80 kqread syslogd 72192 285570 1 0 3 0x100002 0x80 sbwait syslogd 13912 250630 1 0 3 0x100000 0x80 kqread resolvd 85932 385487 22995 77 3 0x100012 0x80 kqread dhcpleased 1253 317643 22995 77 3 0x100012 0x80 kqread dhcpleased 22995 218098 1 0 3 0 0x80 kqread dhcpleased 33686 33278 0 0 3 0x14000 0x200 bored smr 95844 290718 0 0 2 0x14000 0x200 zerothread 37791 165512 0 0 3 0x14000 0x200 aiodoned aiodoned 59710 455664 0 0 3 0x14000 0x200 syncer update 39036 226499 0 0 3 0x14000 0x200 cleaner cleaner 33471 193747 0 0 3 0x14000 0x200 reaper reaper 93182 299080 0 0 3 0x14000 0x200 pgdaemon pagedaemon 97485 305867 0 0 3 0x14000 0x200 bored viomb 33523 70140 0 0 3 0x14000 0x40000200 acpi0 acpi0 35540 68590 0 0 3 0x14000 0x40000200 idle1 90718 86822 0 0 3 0x14000 0x200 bored softnet1 44812 330986 0 0 3 0x14000 0x200 bored softnet0 78188 133487 0 0 3 0x14000 0x200 bored systqmp 89838 250894 0 0 3 0x14000 0x200 bored systq 24060 444610 0 0 3 0x14000 0x200 tmoslp softclockmp 29422 64943 0 0 3 0x14000 0x40000200 tmoslp softclock 48456 514671 0 0 3 0x14000 0x40000200 idle0 1 80292 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &pr->ps_mtx r = 0 (0xffffffff85d371f8) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x683 sys/kern/kern_lock.c:487 #2 knote_processfork+0x666 sys/kern/kern_event.c:-1 #3 fork1+0x1225 sys/kern/kern_fork.c:511 #4 kthread_create+0xa8 sys/kern/kern_kthread.c:61 #5 nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 #6 nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 #7 sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 #8 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #9 Xsyscall+0x128 Process 45955 (syz-executor) thread 0xffff8000298f3a08 (497355) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff85cda380) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 sysctl_vslock+0x72 sys/kern/kern_sysctl.c:197 #2 sys_sysctl+0x460 sys/kern/kern_sysctl.c:304 #3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #4 Xsyscall+0x128 exclusive rwlock sysctllk r = 0 (0xffffffff85073238) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320 #2 sysctl_vslock+0x37 sys/kern/kern_sysctl.c:192 #3 sys_sysctl+0x460 sys/kern/kern_sysctl.c:304 #4 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #5 Xsyscall+0x128 exclusive mutex &pr->ps_mtx r = 0 (0xffffffff85d371f8) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x683 sys/kern/kern_lock.c:487 #2 knote_processfork+0x666 sys/kern/kern_event.c:-1 #3 fork1+0x1225 sys/kern/kern_fork.c:511 #4 kthread_create+0xa8 sys/kern/kern_kthread.c:61 #5 nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 #6 nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 #7 sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 #8 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11061 12254K 12349K 166960K 12357 0 pcb 17 30K 35K 166960K 125 0 rtable 226 21K 23K 166960K 1346 0 pf 37 23K 29K 166960K 132 0 ifaddr 40 12K 12K 166960K 179 0 ifgroup 55 2K 2K 166960K 192 0 sysctl 3 1K 13K 166960K 10 0 counters 70 42K 43K 166960K 138 0 ioctlops 0 0K 4K 166960K 1692 0 iov 0 0K 16K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1297 83K 84K 166960K 1777 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 6K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 47 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 14 49K 93K 166960K 801 0 sigio 0 0K 0K 166960K 5 0 proc 73 128K 193K 166960K 1464 0 subproc 72 9K 9K 166960K 370 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 ip_moptions 0 0K 0K 166960K 6 0 in_multi 88 6K 7K 166960K 452 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 32 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 49 344K 344K 166960K 49 0 exec 0 0K 2K 166960K 811 0 fusefs mount 1 36K 36K 166960K 1 0 tdb 3 1K 1K 166960K 3 0 VM swap 14 124K 124K 166960K 15 0 UVM amap 192 243K 277K 166960K 7464 0 UVM aobj 12 12K 12K 166960K 12 0 pinsyscall 1063 1769K 1817K 166960K 2789 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 5 0 NDP 16 0K 2K 166960K 126 0 temp 38 9162K 9190K 166960K 15367 0 kqueue 14 41K 58K 166960K 71 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 99 0 96 1 0 1 1 0 8 0 rtentry 176 464 0 365 6 1 5 6 0 8 0 unpcb 144 428 0 410 4 0 4 4 0 8 3 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 736 25 0 21 1 0 1 1 0 8 0 arp 136 82 0 66 1 0 1 1 0 8 0 inpcb 328 793 0 786 9 3 6 9 0 8 5 nd6 152 121 0 100 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 41 0 33 1 0 1 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 3 0 2 1 0 1 1 0 8 0 pfosfp 40 1461 0 1037 5 0 5 5 0 8 0 pfosfpen 112 1461 0 746 21 0 21 21 0 8 0 pfrktable 1344 8 0 6 1 0 1 1 0 8 0 pfanchor 1288 3 0 2 1 0 1 1 0 8 0 pfstitem 24 43 0 13 1 0 1 1 0 8 0 pfstkey 128 43 0 13 2 0 2 2 0 8 0 pfstate 448 43 0 13 4 0 4 4 0 8 0 pfrule 1360 26 0 19 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1874 0 1460 35 8 27 29 0 8 1 art_table 40 1875 0 1460 5 0 5 5 0 8 0 art_node 32 464 0 374 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 72 43 0 33 1 0 1 1 0 8 0 shmpl 112 9 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1904 0 347 98 0 98 98 0 8 0 ffsino 296 1904 0 347 120 0 120 120 0 8 0 nchpl 144 2363 0 534 68 0 68 68 0 8 0 vnodes 216 2362 0 0 132 0 132 132 0 8 0 namei 1024 12428 0 12428 6 4 2 3 0 8 2 percpumem 16 85 0 34 1 0 1 1 0 8 0 pfiaddrpl 120 2 0 1 1 0 1 1 0 8 0 kstatmem 264 97 0 68 3 0 3 3 0 8 0 scxspl 216 8756 0 8756 14 6 8 8 1 8 8 plimitpl 152 73 0 56 1 0 1 1 0 8 0 sigapl 424 1053 0 1008 7 1 6 7 0 8 0 knotepl 120 170 0 0 5 0 5 5 0 8 0 kqueuepl 224 89 0 78 2 1 1 2 0 8 0 pipepl 344 249 0 222 4 0 4 4 0 8 1 fdescpl 528 1036 0 1008 3 0 3 3 0 8 0 filepl 160 4720 0 4509 17 2 15 15 0 8 2 lockfpl 104 68 0 66 1 0 1 1 0 8 0 lockfspl 48 33 0 31 1 0 1 1 0 8 0 sessionpl 144 66 0 57 1 0 1 1 0 8 0 pgrppl 48 110 0 93 1 0 1 1 0 8 0 ucredpl 104 309 0 296 1 0 1 1 0 8 0 zombiepl 144 1010 0 1008 1 0 1 1 0 8 0 processpl 1232 1053 0 1008 6 1 5 5 0 8 0 procpl 664 1453 0 1404 6 0 6 6 0 8 1 sosppl 176 1 0 1 1 1 0 1 0 8 0 sockpl 752 1327 0 1299 14 3 11 13 0 8 8 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 117 0 0 15 0 15 15 0 8 0 mcl2k 2048 28 0 0 4 0 4 4 0 8 0 mextrefs 64 28 0 0 1 0 1 1 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 225 0 0 14 0 14 14 0 8 0 bufpl 272 2927 0 106 189 0 189 189 0 8 0 anonpl 32 10641 0 0 86 0 86 86 0 222 0 amapchunkpl 152 20861 0 20506 23 4 19 23 0 158 3 amappl16 200 3585 0 3571 34 27 7 25 0 8 5 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 820 0 818 1 0 1 1 0 8 0 amappl13 176 190 0 178 1 0 1 1 0 8 0 amappl12 168 1410 0 1384 2 0 2 2 0 8 0 amappl11 160 13 0 13 2 1 1 1 0 8 1 amappl10 152 65 0 51 1 0 1 1 0 8 0 amappl9 144 269 0 269 1 1 0 1 0 8 0 amappl8 136 229 0 225 1 0 1 1 0 8 0 amappl7 128 213 0 199 1 0 1 1 0 8 0 amappl6 120 482 0 481 1 0 1 1 0 8 0 amappl5 112 141 0 131 1 0 1 1 0 8 0 amappl4 104 390 0 368 1 0 1 1 0 8 0 amappl3 96 3756 0 3682 3 0 3 3 0 8 0 amappl2 88 1049 0 974 2 0 2 2 0 8 0 amappl1 80 15372 0 14794 16 2 14 15 0 8 0 amappl 88 6174 0 6052 4 0 4 4 0 92 0 uvmvnodes 80 101 0 0 3 0 3 3 0 8 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 11 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1036 0 1008 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1036 0 1008 1 0 1 1 0 8 0 vmmpekpl 168 10380 0 10350 3 0 3 3 0 8 0 vmmpepl 168 76920 0 75199 99 11 88 99 0 357 5 vmsppl 488 1035 0 1008 5 0 5 5 0 8 0 rwobjpl 80 25314 0 24335 31 6 25 31 0 8 0 pdppl 4096 2080 0 2016 154 84 70 86 0 8 6 pvpl 32 19048 0 0 156 2 154 154 0 265 0 pmappl 256 1035 0 1008 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 120 537 0 101 14 0 14 14 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x19: leave x86_ipi_db(ffffffff84f15ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x215 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x7b sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 sys/kern/kern_lock.c:173 ktrstruct(ffff8000298f2018,ffffffff84b77c60,ffff800029aaf880,20) at ktrstruct+0x13f sys/kern/kern_ktrace.c:314 sys_kevent(ffff8000298f2018,ffff800029aafbb0,ffff800029aafb20) at sys_kevent+0xacb sys/kern/kern_event.c:1343 syscall(ffff800029aafbb0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800029aafbb0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x41358c1a680, count: 3 ddb{0}> trace x86_ipi_db(ffffffff84f15ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x215 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x7b sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 sys/kern/kern_lock.c:173 ktrstruct(ffff8000298f2018,ffffffff84b77c60,ffff800029aaf880,20) at ktrstruct+0x13f sys/kern/kern_ktrace.c:314 sys_kevent(ffff8000298f2018,ffff800029aafbb0,ffff800029aafb20) at sys_kevent+0xacb sys/kern/kern_event.c:1343 syscall(ffff800029aafbb0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800029aafbb0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x41358c1a680, count: -12 ddb{0}> machine ddbcpu 1 Stopped at knote_processfork+0x287: movq 0x8(%r15),%r14 knote_processfork(ffffffff85d370e0,ed10) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff800039afad20) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff800039afaf28,1,0,ffff800039afaf00,200000000200,0,ffff800039afb180) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff8000298f3a08,ffff800039afb180,ffff800039afb0e0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff800039afb180) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039afb180) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x413ca701a40, count: 7 ddb{1}> trace knote_processfork(ffffffff85d370e0,ed10) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff800039afad20) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff800039afaf28,1,0,ffff800039afaf00,200000000200,0,ffff800039afb180) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff8000298f3a08,ffff800039afb180,ffff800039afb0e0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff800039afb180) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039afb180) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x413ca701a40, count: -8