…ßxùÿÿÿ./file0uvm_fault(0xffff800001c4f5d0, 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 109396 81633 0 0x100000 0 0 sh *200044 57392 0 0 0x4000000 1 syz-executor knote_processfork(ffffffff85d370e0,14ffb) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff800029a09b20) 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(ffff800029a09d28,1,0,ffff800029a09d00,200000000200,0,ffff800029a09f70) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff80003bb6f4e8,ffff800029a09f70,ffff800029a09ee0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff800029a09f70) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800029a09f70) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6bafd3786f0, 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(0xffff800001c4f5d0, 0x8, 0, 1) -> e ddb{1}> show kasan kasan: no report recorded this boot ddb{1}> trace knote_processfork(ffffffff85d370e0,14ffb) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff800029a09b20) 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(ffff800029a09d28,1,0,ffff800029a09d00,200000000200,0,ffff800029a09f70) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff80003bb6f4e8,ffff800029a09f70,ffff800029a09ee0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff800029a09f70) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800029a09f70) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6bafd3786f0, count: -8 ddb{1}> show registers rdi 0x8 rsi 0x1 rbp 0xffff800029a099f0 rbx 0xffff800001d9df32 rdx 0 rcx 0xffff800028fe3ff0 rax 0x1 r8 0x8 r9 0x1 r10 0 r11 0xffffffff8301f780 filt_proc r12 0xffff800029a098a0 r13 0xffff800029a098a0 r14 0xffffffff85d37220 process0+0x140 r15 0 rip 0xffffffff8302db97 knote_processfork+0x287 cs 0x8 rflags 0x10286 __ALIGN_SIZE+0xf286 rsp 0xffff800029a09840 ss 0x10 knote_processfork+0x287: movq 0x8(%r15),%r14 ddb{1}> show proc PROC (syz-executor) tid=200044 pid=57392 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=75, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003bb6f250,0xffff80003bb6e800 process=0xffff80003bb704f0 user=0xffff8000299ff000, vmspace=0xffff800001c4f5d0 estcpu=25, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 86011 122 0 0 2 0x14000 0x200 swapper 81633 109396 15018 0 7 0x100000 0 sh 15018 134938 82913 0 2 0x100002 0 sh 57392 352723 68803 0 2 0 0 syz-executor 57392 194919 68803 0 3 0 0x4000080 fsleep syz-executor 57392 224857 68803 0 3 0 0x4000080 fsleep syz-executor *57392 200044 68803 0 7 0 0x4000000 syz-executor 82913 39898 57103 0 3 0x2 0x80 wait syz-executor 29003 267958 57103 0 3 0x2 0 biowait syz-executor 81305 363785 57103 0 3 0x2 0x80 piperd syz-executor 68803 359644 57103 0 3 0x2 0x80 nanoslp syz-executor 79860 470840 0 0 3 0x14000 0x200 acct acct 57103 130075 24784 0 3 0x2 0x80 wait syz-executor 24784 82656 62148 0 3 0x100002 0x88 sigsusp ksh 62148 286167 43665 0 3 0x10 0x88 kqread sshd-session 43665 366899 97730 0 3 0x12 0x80 kqread sshd-session 32661 352938 1 0 3 0x100003 0x80 ttyin getty 97730 97720 1 0 3 0 0x88 kqread sshd 37652 32840 10318 74 3 0x1100012 0x80 bpf pflogd 10318 463494 1 0 3 0 0x80 sbwait pflogd 27875 386421 32884 73 3 0x1100010 0x80 kqread syslogd 32884 205462 1 0 3 0x100002 0x80 sbwait syslogd 41420 82063 1 0 3 0x100000 0x80 kqread resolvd 40432 62203 0 0 3 0x14000 0x200 bored smr 97251 191561 0 0 2 0x14000 0x200 zerothread 69150 7128 0 0 3 0x14000 0x200 aiodoned aiodoned 22198 84336 0 0 3 0x14000 0x200 syncer update 72352 98908 0 0 3 0x14000 0x200 cleaner cleaner 10307 141209 0 0 3 0x14000 0x200 reaper reaper 29534 256657 0 0 3 0x14000 0x200 pgdaemon pagedaemon 256 214597 0 0 3 0x14000 0x200 bored viomb 36038 90718 0 0 3 0x14000 0x40000200 acpi0 acpi0 15529 95880 0 0 3 0x14000 0x40000200 idle1 55467 509712 0 0 3 0x14000 0x200 bored softnet1 14804 197285 0 0 3 0x14000 0x200 bored softnet0 27679 479527 0 0 3 0x14000 0x200 bored systqmp 93053 334431 0 0 3 0x14000 0x200 bored systq 61415 110869 0 0 3 0x14000 0x200 tmoslp softclockmp 12082 195573 0 0 3 0x14000 0x40000200 tmoslp softclock 55238 161573 0 0 3 0x14000 0x40000200 idle0 1 119250 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 57392 (syz-executor) thread 0xffff80003bb6f4e8 (200044) 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 Process 29003 (syz-executor) thread 0xffff80003bb6fa18 (267958) exclusive rrwlock inode r = 0 (0xffff800001e00ef8) #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 rrw_enter+0xf0 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0x17e sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0xda sys/ufs/ufs/ufs_ihash.c:146 #5 ffs_vget+0x2e9 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x576 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0x25d sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x1a8 sys/kern/vfs_vops.c:394 #9 domkdirat+0x1f9 sys/kern/vfs_syscalls.c:3063 #10 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xffff800001d4eed8) #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 rrw_enter+0xf0 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0x17e sys/kern/vfs_vops.c:527 #4 vn_lock+0xca sys/kern/vfs_vnops.c:576 #5 vfs_lookup+0x1f7 sys/kern/vfs_lookup.c:431 #6 namei+0xe19 sys/kern/vfs_lookup.c:250 #7 domkdirat+0xe1 sys/kern/vfs_syscalls.c:3048 #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 11057 12241K 12386K 166960K 12307 0 pcb 17 24K 24K 166960K 47 0 rtable 228 21K 22K 166960K 996 0 pf 39 24K 26K 166960K 104 0 ifaddr 41 12K 12K 166960K 135 0 ifgroup 59 2K 2K 166960K 149 0 sysctl 1 1K 13K 166960K 7 0 counters 72 43K 43K 166960K 118 0 ioctlops 0 0K 4K 166960K 1541 0 iov 0 0K 16K 166960K 7 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1364 88K 88K 166960K 1915 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 8 0K 0K 166960K 8 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 13 45K 93K 166960K 628 0 sigio 0 0K 0K 166960K 1 0 proc 66 96K 226K 166960K 1142 0 subproc 72 9K 9K 166960K 261 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 ip_moptions 0 0K 0K 166960K 14 0 in_multi 88 6K 7K 166960K 333 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 19 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 55 384K 384K 166960K 55 0 exec 0 0K 2K 166960K 656 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 168 218K 277K 166960K 6451 0 UVM aobj 7 4K 4K 166960K 7 0 pinsyscall 1056 1796K 1822K 166960K 2317 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 1 0 NDP 23 1K 2K 166960K 94 0 temp 36 9162K 9190K 166960K 7299 0 kqueue 8 26K 65K 166960K 87 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 74 0 73 1 0 1 1 0 8 0 rtentry 176 343 0 243 7 1 6 6 0 8 1 unpcb 144 360 0 349 3 2 1 3 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 60 0 43 1 0 1 1 0 8 0 inpcb 328 274 0 269 2 1 1 2 0 8 0 nd6 152 88 0 67 1 0 1 1 0 8 0 kcovpl 48 29 0 21 1 0 1 1 0 8 0 ppxss 1192 1 0 1 1 1 0 1 0 8 0 pfstscr 40 1 0 0 1 0 1 1 0 8 0 pffrag 232 3 0 0 1 0 1 1 0 482 0 pffrnode 88 3 0 0 1 0 1 1 0 8 0 pffrent 40 3 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 pfrktable 1344 3 0 1 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 3 0 0 1 0 1 1 0 8 0 pfstitem 24 52 0 10 1 0 1 1 0 8 0 pfstkey 128 56 0 14 2 0 2 2 0 8 0 pfstate 448 53 0 12 6 0 6 6 0 8 0 pfrule 1360 25 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 1424 0 1010 32 3 29 29 0 8 0 art_table 40 1425 0 1010 5 0 5 5 0 8 0 art_node 32 343 0 252 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semapl 72 6 0 0 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2046 0 524 96 0 96 96 0 8 0 ffsino 296 2046 0 524 118 0 118 118 0 8 0 nchpl 144 2514 0 729 67 0 67 67 0 8 0 vnodes 216 2508 0 0 140 0 140 140 0 8 0 namei 1024 11324 0 11323 3 2 1 2 0 8 0 percpumem 16 75 0 23 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 0 1 0 1 1 0 8 0 kstatmem 264 77 0 46 3 0 3 3 0 8 0 scxspl 216 8793 0 8792 11 4 7 8 1 8 6 plimitpl 152 134 0 118 1 0 1 1 0 8 0 sigapl 424 906 0 864 7 1 6 7 0 8 0 knotepl 120 226 0 0 7 0 7 7 0 8 0 kqueuepl 224 182 0 174 5 0 5 5 0 8 4 pipepl 344 217 0 190 3 0 3 3 0 8 0 fdescpl 528 888 0 864 3 0 3 3 0 8 0 filepl 160 4212 0 4021 15 3 12 15 0 8 1 lockfpl 104 87 0 86 1 0 1 1 0 8 0 lockfspl 48 35 0 34 1 0 1 1 0 8 0 sessionpl 144 49 0 41 1 0 1 1 0 8 0 pgrppl 48 82 0 66 1 0 1 1 0 8 0 ucredpl 104 696 0 685 1 0 1 1 0 8 0 zombiepl 144 868 0 864 1 0 1 1 0 8 0 processpl 1232 906 0 864 5 1 4 5 0 8 0 procpl 664 1257 0 1212 6 0 6 6 0 8 1 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 752 711 0 694 9 3 6 9 0 8 4 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k128 9344 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mextrefs 64 20 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 183 0 0 12 0 12 12 0 8 0 bufpl 272 2860 0 106 184 0 184 184 0 8 0 anonpl 32 5386 0 0 45 1 44 44 0 222 0 amapchunkpl 152 18369 0 18051 28 5 23 28 0 158 5 amappl16 200 2287 0 2282 6 4 2 5 0 8 0 amappl15 192 5 0 4 1 0 1 1 0 8 0 amappl14 184 676 0 674 1 0 1 1 0 8 0 amappl13 176 168 0 158 1 0 1 1 0 8 0 amappl12 168 1217 0 1195 2 0 2 2 0 8 0 amappl11 160 45 0 45 2 2 0 1 0 8 0 amappl10 152 66 0 57 1 0 1 1 0 8 0 amappl9 144 299 0 299 2 2 0 1 0 8 0 amappl8 136 178 0 176 1 0 1 1 0 8 0 amappl7 128 188 0 178 1 0 1 1 0 8 0 amappl6 120 358 0 356 1 0 1 1 0 8 0 amappl5 112 131 0 123 1 0 1 1 0 8 0 amappl4 104 366 0 346 1 0 1 1 0 8 0 amappl3 96 3348 0 3285 3 0 3 3 0 8 0 amappl2 88 934 0 875 2 0 2 2 0 8 0 amappl1 80 13939 0 13447 16 3 13 15 0 8 0 amappl 88 5363 0 5250 5 1 4 5 0 92 0 uvmvnodes 80 102 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 7 0 7 2 2 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 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 888 0 864 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 888 0 864 1 0 1 1 0 8 0 vmmpekpl 168 9207 0 9162 3 0 3 3 0 8 0 vmmpepl 168 65806 0 64420 87 8 79 87 0 357 4 vmsppl 488 887 0 864 5 0 5 5 0 8 0 rwobjpl 80 21457 0 20615 24 2 22 24 0 8 0 pdppl 4096 1784 0 1728 130 56 74 86 0 8 18 pvpl 32 11533 0 0 94 0 94 94 0 265 0 pmappl 256 887 0 864 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 120 500 0 67 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 sys/dev/kcov.c:153 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x290 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x290 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 end trace frame: 0x0, count: 6 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 sys/dev/kcov.c:153 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x290 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x290 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 end trace frame: 0x0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at knote_processfork+0x287: movq 0x8(%r15),%r14 knote_processfork(ffffffff85d370e0,14ffb) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff800029a09b20) 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(ffff800029a09d28,1,0,ffff800029a09d00,200000000200,0,ffff800029a09f70) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff80003bb6f4e8,ffff800029a09f70,ffff800029a09ee0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff800029a09f70) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800029a09f70) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6bafd3786f0, count: 7 ddb{1}> trace knote_processfork(ffffffff85d370e0,14ffb) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff800029a09b20) 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(ffff800029a09d28,1,0,ffff800029a09d00,200000000200,0,ffff800029a09f70) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff80003bb6f4e8,ffff800029a09f70,ffff800029a09ee0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff800029a09f70) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800029a09f70) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6bafd3786f0, count: -8