uvm_fault(0xffff800001c4bb88, 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 422162 37180 0 0x100002 0 0 ndp *189097 88103 0 0 0x4000000 1 syz-executor knote_processfork(ffffffff85d370e0,3017) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff800034ee2ec0) 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(ffff800034ee30c8,1,0,ffff800034ee30a0,200000000200,0,ffff800034ee3320) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff80003bb3bca8,ffff800034ee3320,ffff800034ee3280) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff800034ee3320) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800034ee3320) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x972738ff90, 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(0xffff800001c4bb88, 0x8, 0, 1) -> e ddb{1}> show kasan kasan: no report recorded this boot ddb{1}> trace knote_processfork(ffffffff85d370e0,3017) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff800034ee2ec0) 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(ffff800034ee30c8,1,0,ffff800034ee30a0,200000000200,0,ffff800034ee3320) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff80003bb3bca8,ffff800034ee3320,ffff800034ee3280) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff800034ee3320) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800034ee3320) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x972738ff90, count: -8 ddb{1}> show registers rdi 0x8 rsi 0x1 rbp 0xffff800034ee2d90 rbx 0xffff800001d594ea rdx 0 rcx 0xffff800028fe3ff0 rax 0x1 r8 0x8 r9 0x1 r10 0 r11 0xffffffff8301f780 filt_proc r12 0xffff800034ee2c40 r13 0xffff800034ee2c40 r14 0xffffffff85d37220 process0+0x140 r15 0 rip 0xffffffff8302db97 knote_processfork+0x287 cs 0x8 rflags 0x10286 __ALIGN_SIZE+0xf286 rsp 0xffff800034ee2be0 ss 0x10 knote_processfork+0x287: movq 0x8(%r15),%r14 ddb{1}> show proc PROC (syz-executor) tid=189097 pid=88103 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=76, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003bb3a020,0xffff800029894018 process=0xffff80003bb6d830 user=0xffff800034ed8000, vmspace=0xffff800001c4bb88 estcpu=26, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 12311 487315 0 0 2 0x14000 0x200 swapper 55105 172862 7392 0 3 0x100002 0x80 sysctllk ndp 7392 221903 37305 0 3 0x100002 0x88 sigsusp sh 37180 422162 11344 0 7 0x100002 0 ndp 11344 139383 567 0 3 0x100002 0x88 sigsusp sh 44567 350419 19682 20 3 0x10 0x80 nanoslp syz-executor 44567 251869 19682 20 3 0x10 0x4000080 kqread syz-executor 44567 161202 19682 20 3 0x10 0x4000080 fsleep syz-executor 88103 276205 81548 0 2 0 0 syz-executor 88103 212021 81548 0 3 0 0x4000080 fsleep syz-executor 88103 372746 81548 0 2 0 0x4000080 syz-executor *88103 189097 81548 0 7 0 0x4000000 syz-executor 4939 62899 41517 0 3 0 0x80 nanoslp syz-executor 4939 70621 41517 0 3 0 0x4000080 kqsel syz-executor 4939 403206 41517 0 3 0 0x4000080 fsleep syz-executor 4939 492993 41517 0 3 0 0x4000080 fsleep syz-executor 567 429997 50374 0 3 0x2 0x80 wait syz-executor 37305 383341 50374 0 3 0x2 0x80 wait syz-executor 68088 169071 31711 0 3 0x100002 0x80 sbwait arp 31711 473390 88267 0 3 0x100002 0x88 sigsusp sh 38400 516851 50374 0 3 0x2 0x80 piperd syz-executor 19682 144761 50374 0 3 0x2 0x80 nanoslp syz-executor 88267 430754 50374 0 3 0x2 0x80 wait syz-executor 81548 408440 50374 0 3 0x2 0x80 nanoslp syz-executor 41517 303119 50374 0 3 0x2 0x80 nanoslp syz-executor 50374 401261 16276 0 3 0x2 0x80 wait syz-executor 16276 253107 83946 0 3 0x100002 0x88 sigsusp ksh 83946 242040 40348 0 3 0x10 0x88 kqread sshd-session 40348 439823 63234 0 3 0x12 0x80 kqread sshd-session 38446 40257 1 0 3 0x100003 0x80 ttyin getty 63234 102369 1 0 3 0 0x88 kqread sshd 7543 361873 36293 74 3 0x1100012 0x80 bpf pflogd 36293 233382 1 0 3 0 0x80 sbwait pflogd 13825 366517 91989 73 3 0x1100010 0x80 kqread syslogd 91989 353571 1 0 3 0x100002 0x80 sbwait syslogd 60026 152118 1 0 3 0x100000 0x80 kqread resolvd 39635 376561 7642 77 3 0x100012 0x80 kqread dhcpleased 48939 490849 7642 77 3 0x100012 0x80 kqread dhcpleased 7642 256358 1 0 3 0 0x80 kqread dhcpleased 57201 243973 0 0 3 0x14000 0x200 pause smr 53294 118672 0 0 2 0x14000 0x200 zerothread 33204 410416 0 0 3 0x14000 0x200 aiodoned aiodoned 77414 220766 0 0 3 0x14000 0x200 syncer update 80780 12077 0 0 3 0x14000 0x200 cleaner cleaner 43836 3901 0 0 3 0x14000 0x200 reaper reaper 71256 383969 0 0 3 0x14000 0x200 pgdaemon pagedaemon 93439 327421 0 0 3 0x14000 0x200 bored viomb 29650 338195 0 0 3 0x14000 0x40000200 acpi0 acpi0 71749 296171 0 0 3 0x14000 0x40000200 idle1 16122 240136 0 0 3 0x14000 0x200 bored softnet1 81343 226074 0 0 3 0x14000 0x200 bored softnet0 23085 416338 0 0 3 0x14000 0x200 bored systqmp 74357 426077 0 0 3 0x14000 0x200 bored systq 45410 78188 0 0 3 0x14000 0x200 tmoslp softclockmp 33463 372012 0 0 3 0x14000 0x40000200 tmoslp softclock 44367 460553 0 0 3 0x14000 0x40000200 idle0 1 440557 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 88103 (syz-executor) thread 0xffff80003bb3bca8 (189097) 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 11052 12248K 12397K 166960K 12257 0 pcb 17 24K 24K 166960K 35 0 rtable 195 10K 12K 166960K 503 0 pf 33 22K 24K 166960K 64 0 ifaddr 37 10K 11K 166960K 71 0 ifgroup 51 2K 2K 166960K 88 0 sysctl 1 1K 13K 166960K 5 0 counters 68 42K 42K 166960K 86 0 ioctlops 0 0K 4K 166960K 1505 0 iov 0 0K 0K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1299 84K 84K 166960K 1505 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 6K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 89K 166960K 305 0 sigio 0 0K 0K 166960K 1 0 proc 74 144K 177K 166960K 729 0 subproc 72 9K 9K 166960K 126 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 ip_moptions 0 0K 0K 166960K 4 0 in_multi 78 5K 6K 166960K 156 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 8 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 43 303K 303K 166960K 43 0 exec 0 0K 2K 166960K 460 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 231 230K 254K 166960K 4315 0 UVM aobj 6 4K 4K 166960K 6 0 pinsyscall 1071 1776K 1777K 166960K 1611 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 4 0 NDP 17 0K 1K 166960K 46 0 temp 35 9162K 9190K 166960K 7015 0 kqueue 14 41K 60K 166960K 44 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 44 0 38 1 0 1 1 0 8 0 rtentry 176 170 0 81 5 0 5 5 0 8 0 unpcb 144 96 0 74 1 0 1 1 0 8 0 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 736 19 0 15 1 0 1 1 0 8 0 arp 136 30 0 15 1 0 1 1 0 8 0 inpcb 328 144 0 137 2 0 2 2 0 8 1 nd6 152 39 0 23 1 0 1 1 0 8 0 kcovpl 48 14 0 6 1 0 1 1 0 8 0 pfstscr 40 2 0 2 1 0 1 1 0 8 1 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 1 0 0 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 43 0 0 1 0 1 1 0 8 0 pfstkey 128 45 0 2 2 0 2 2 0 8 0 pfstate 448 44 0 1 5 0 5 5 0 8 0 pfrule 1360 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 685 0 316 26 0 26 26 0 8 2 art_table 40 686 0 316 5 0 5 5 0 8 0 art_node 32 170 0 89 1 0 1 1 0 8 0 semapl 72 3 0 0 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1711 0 228 93 0 93 93 0 8 0 ffsino 296 1711 0 228 115 0 115 115 0 8 0 nchpl 144 2031 0 308 64 0 64 64 0 8 0 vnodes 216 1925 0 0 107 0 107 107 0 8 0 namei 1024 7722 0 7722 5 4 1 2 0 8 1 percpumem 16 59 0 9 1 0 1 1 0 8 0 kstatmem 264 43 0 18 2 0 2 2 0 8 0 scxspl 216 7730 0 7730 3 2 1 2 1 8 1 plimitpl 152 40 0 23 1 0 1 1 0 8 0 sigapl 424 612 0 562 7 0 7 7 0 8 0 knotepl 120 153 0 0 5 0 5 5 0 8 0 kqueuepl 224 57 0 44 1 0 1 1 0 8 0 pipepl 344 182 0 155 6 0 6 6 0 8 3 fdescpl 528 595 0 562 3 0 3 3 0 8 0 filepl 160 2209 0 1984 13 0 13 13 0 8 3 lockfpl 104 71 0 69 1 0 1 1 0 8 0 lockfspl 48 26 0 24 1 0 1 1 0 8 0 sessionpl 144 37 0 28 1 0 1 1 0 8 0 pgrppl 48 51 0 34 1 0 1 1 0 8 0 ucredpl 104 137 0 122 1 0 1 1 0 8 0 zombiepl 144 563 0 562 1 0 1 1 0 8 0 processpl 1232 612 0 562 5 0 5 5 0 8 0 procpl 664 766 0 708 6 0 6 6 0 8 0 sosppl 176 4 0 4 1 0 1 1 0 8 1 sockpl 752 285 0 250 4 0 4 4 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mextrefs 64 27 0 0 1 0 1 1 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 192 0 0 12 0 12 12 0 8 0 bufpl 272 2732 0 106 176 0 176 176 0 8 0 anonpl 32 3780 0 0 31 0 31 31 0 222 0 amapchunkpl 152 11913 0 11481 20 0 20 20 0 158 1 amappl16 200 1840 0 1823 6 3 3 5 0 8 1 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 498 0 494 1 0 1 1 0 8 0 amappl13 176 151 0 136 1 0 1 1 0 8 0 amappl12 168 900 0 870 2 0 2 2 0 8 0 amappl11 160 29 0 29 4 3 1 1 0 8 1 amappl10 152 64 0 50 1 0 1 1 0 8 0 amappl9 144 280 0 280 1 1 0 1 0 8 0 amappl8 136 179 0 177 1 0 1 1 0 8 0 amappl7 128 157 0 141 1 0 1 1 0 8 0 amappl6 120 214 0 210 1 0 1 1 0 8 0 amappl5 112 110 0 99 1 0 1 1 0 8 0 amappl4 104 309 0 288 1 0 1 1 0 8 0 amappl3 96 2149 0 2056 3 0 3 3 0 8 0 amappl2 88 690 0 610 2 0 2 2 0 8 0 amappl1 80 11417 0 10744 15 0 15 15 0 8 1 amappl 88 3487 0 3340 4 0 4 4 0 92 0 uvmvnodes 80 100 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 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 595 0 562 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 595 0 562 1 0 1 1 0 8 0 vmmpekpl 168 6931 0 6895 3 0 3 3 0 8 0 vmmpepl 168 47423 0 45493 90 2 88 89 0 357 2 vmsppl 488 594 0 562 5 0 5 5 0 8 0 rwobjpl 80 16594 0 15469 24 0 24 24 0 8 0 pdppl 4096 1198 0 1124 106 26 80 84 0 8 6 pvpl 32 10711 0 0 88 1 87 87 0 265 0 pmappl 256 594 0 562 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 120 460 0 35 13 0 13 13 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 __asan_load4_noabort(ffffffff85cd9b80) at __asan_load4_noabort 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 syscall(ffff80003bb6ba10) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003bb6ba10) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e1ac77d34a0, count: 5 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 __asan_load4_noabort(ffffffff85cd9b80) at __asan_load4_noabort 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 syscall(ffff80003bb6ba10) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003bb6ba10) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e1ac77d34a0, count: -10 ddb{0}> machine ddbcpu 1 Stopped at knote_processfork+0x287: movq 0x8(%r15),%r14 knote_processfork(ffffffff85d370e0,3017) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff800034ee2ec0) 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(ffff800034ee30c8,1,0,ffff800034ee30a0,200000000200,0,ffff800034ee3320) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff80003bb3bca8,ffff800034ee3320,ffff800034ee3280) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff800034ee3320) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800034ee3320) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x972738ff90, count: 7 ddb{1}> trace knote_processfork(ffffffff85d370e0,3017) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff800034ee2ec0) 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(ffff800034ee30c8,1,0,ffff800034ee30a0,200000000200,0,ffff800034ee3320) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff80003bb3bca8,ffff800034ee3320,ffff800034ee3280) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff800034ee3320) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800034ee3320) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x972738ff90, count: -8