uvm_fault(0xffff800000dbc000, 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 258428 9972 0 0 0x4000001 0 syz-executor *324922 9972 0 0 0x4000000 1K syz-executor knote_processfork(ffffffff85e32ee0,6495) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85e32b80,f0,ffffffff8349e060,0,0,ffff80003bb28900) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff8349e060,0,0,ffffffff84c49da0) 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(ffff80003bb28b08,1,0,ffff80003bb28ae0,200000000200,0,ffff80003bb28d60) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045ff5a10,ffff80003bb28d60,ffff80003bb28cc0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bb28d60) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb28d60) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdccedc99ec0, 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(0xffff800000dbc000, 0x8, 0, 1) -> e ddb{1}> show kasan kasan: no report recorded this boot ddb{1}> trace knote_processfork(ffffffff85e32ee0,6495) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85e32b80,f0,ffffffff8349e060,0,0,ffff80003bb28900) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff8349e060,0,0,ffffffff84c49da0) 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(ffff80003bb28b08,1,0,ffff80003bb28ae0,200000000200,0,ffff80003bb28d60) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045ff5a10,ffff80003bb28d60,ffff80003bb28cc0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bb28d60) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb28d60) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdccedc99ec0, count: -8 ddb{1}> show registers rdi 0x8 rsi 0x1 rbp 0xffff80003bb287d0 rbx 0xffff800001b03472 rdx 0 rcx 0xffff800028fe3ff0 rax 0x1 r8 0x8 r9 0x1 r10 0 r11 0xffffffff835906e0 filt_proc r12 0xffff80003bb28680 r13 0xffff80003bb28680 r14 0xffffffff85e33020 process0+0x140 r15 0 rip 0xffffffff8359eaf7 knote_processfork+0x287 cs 0x8 rflags 0x10282 __ALIGN_SIZE+0xf282 rsp 0xffff80003bb28620 ss 0x10 knote_processfork+0x287: movq 0x8(%r15),%r14 ddb{1}> show proc PROC (syz-executor) tid=324922 pid=9972 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003bb5a7f0,0xffff800045ff4fc0 process=0xffff800045ff89b8 user=0xffff80003bb1d000, vmspace=0xffff800000dbc000 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 25749 427157 0 0 2 0x14000 0x200 swapper 18838 457372 61570 0 2 0 0 syz-executor 43379 138235 17219 0 2 0 0 syz-executor 43379 395557 17219 0 3 0 0x4000080 fsleep syz-executor 83093 180169 868 0 2 0 0 syz-executor 83093 363148 868 0 2 0 0x4000080 syz-executor 59466 189818 14429 0 3 0 0x80 nanoslp syz-executor 59466 505385 14429 0 3 0 0x4000080 kqread syz-executor 59466 134048 14429 0 3 0 0x4000080 fsleep syz-executor 9534 454241 62998 0 2 0 0 syz-executor 9534 229993 62998 0 3 0 0x4000080 fsleep syz-executor 9534 82883 62998 0 2 0 0x4000000 syz-executor 92237 166649 32754 0 2 0 0 syz-executor 92237 282322 32754 0 3 0 0x4000080 fsleep syz-executor 9972 331886 33089 0 2 0 0 syz-executor 9972 62839 33089 0 2 0 0x4000080 syz-executor 9972 258428 33089 0 7 0 0x4000001 syz-executor * 9972 324922 33089 0 7 0 0x4000000 syz-executor 13777 235334 0 0 3 0x14000 0x200 acct acct 32754 401445 63146 0 3 0x2 0x80 nanoslp syz-executor 61570 263293 63146 0 3 0x2 0x80 nanoslp syz-executor 33089 249061 63146 0 3 0x2 0x80 nanoslp syz-executor 51808 176336 63146 0 3 0x2 0x80 nanoslp syz-executor 14429 204553 63146 0 3 0x2 0x80 nanoslp syz-executor 62998 192155 63146 0 3 0x2 0x80 nanoslp syz-executor 868 172232 63146 0 3 0x2 0x80 nanoslp syz-executor 17219 30773 63146 0 3 0x2 0x80 nanoslp syz-executor 63146 21064 9272 0 3 0x2 0x80 kqread syz-executor 9272 319601 55169 0 3 0x100002 0x88 sigsusp ksh 55169 64980 2267 0 3 0x10 0x88 kqread sshd-session 2267 325529 62510 0 3 0x12 0x80 kqread sshd-session 80385 185158 1 0 3 0x100003 0x80 ttyin getty 62510 266146 1 0 3 0 0x88 kqread sshd 80055 283127 46000 74 3 0x1100012 0x80 bpf pflogd 46000 453444 1 0 3 0 0x80 sbwait pflogd 21581 20692 18056 73 3 0x1100010 0x80 kqread syslogd 18056 61070 1 0 3 0x100002 0x80 sbwait syslogd 95217 492652 1 0 3 0x100000 0x80 kqread resolvd 6249 399341 75855 77 3 0x100012 0x80 kqread dhcpleased 87009 178129 75855 77 3 0x100012 0x80 kqread dhcpleased 75855 300656 1 0 3 0 0x80 kqread dhcpleased 22512 259260 0 0 3 0x14000 0x200 bored smr 17081 376879 0 0 2 0x14000 0x200 zerothread 15479 9647 0 0 3 0x14000 0x200 aiodoned aiodoned 83544 471245 0 0 3 0x14000 0x200 syncer update 99925 314829 0 0 3 0x14000 0x200 cleaner cleaner 43089 483679 0 0 3 0x14000 0x200 reaper reaper 39334 21706 0 0 3 0x14000 0x200 pgdaemon pagedaemon 31329 116606 0 0 3 0x14000 0x200 bored viomb 40166 392798 0 0 3 0x14000 0x40000200 acpi0 acpi0 15284 401493 0 0 3 0x14000 0x40000200 idle1 2617 346194 0 0 3 0x14000 0x200 bored softnet1 93957 227732 0 0 3 0x14000 0x200 bored softnet0 8608 123978 0 0 3 0x14000 0x200 bored systqmp 33901 396765 0 0 3 0x14000 0x200 bored systq 14557 376574 0 0 3 0x14000 0x200 tmoslp softclockmp 21684 52331 0 0 3 0x14000 0x40000200 tmoslp softclock 6521 361630 0 0 3 0x14000 0x40000200 idle0 1 283165 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 (0xffffffff85e32ff8) #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 9972 (syz-executor) thread 0xffff800045ff5a10 (324922) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff85449c80) #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 (0xffffffff853d3ef8) #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 (0xffffffff85e32ff8) #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 11085 12292K 12394K 166960K 12234 0 pcb 17 24K 24K 166960K 20 0 rtable 232 13K 31K 166960K 354 0 pf 45 26K 30K 166960K 69 0 ifaddr 46 12K 13K 166960K 55 0 ifgroup 74 3K 4K 166960K 94 0 sysctl 1 1K 13K 166960K 5 0 counters 78 44K 46K 166960K 86 0 ioctlops 5 10K 194K 166960K 1489 0 iov 0 0K 12K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1328 86K 88K 166960K 1425 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 2K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 4 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 413K 166960K 11964 0 file desc 18 65K 117K 166960K 185 0 sigio 0 0K 0K 166960K 2 0 proc 70 128K 194K 166960K 552 0 subproc 72 9K 9K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 ip_moptions 4 0K 0K 166960K 12 0 in_multi 98 7K 7K 166960K 99 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 16K 166960K 382 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 464 257K 360K 166960K 3503 0 UVM aobj 3 4K 4K 166960K 3 0 pinsyscall 70 140K 361K 166960K 1341 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 16 0K 2K 166960K 36 0 temp 722 9206K 9449K 166960K 4647 0 kqueue 17 53K 84K 166960K 30 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 33 0 30 1 0 1 1 0 8 0 rtentry 176 111 0 5 5 0 5 5 0 8 0 unpcb 144 74 0 56 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 8 0 4 1 0 1 1 0 8 0 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 79 0 72 1 0 1 1 0 8 0 nd6 152 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 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 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 pfrktable 1344 1 0 1 1 0 1 1 0 8 1 pfstitem 24 35 0 0 1 0 1 1 0 8 0 pfstkey 128 35 0 0 2 0 2 2 0 8 0 pfstate 448 35 0 0 4 0 4 4 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 256 451 0 4 29 0 29 29 0 8 0 art_table 40 452 0 4 5 0 5 5 0 8 0 art_node 32 111 0 15 1 0 1 1 0 8 0 semapl 72 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1669 0 198 93 0 93 93 0 8 0 ffsino 296 1669 0 198 114 0 114 114 0 8 0 nchpl 144 1917 0 215 64 0 64 64 0 8 0 vnodes 216 1782 0 0 99 0 99 99 0 8 0 namei 1024 6489 0 6489 1 0 1 1 0 8 1 percpumem 16 59 0 7 1 0 1 1 0 8 0 kstatmem 264 43 0 14 3 0 3 3 0 8 0 scxspl 216 7303 0 7303 10 2 8 8 1 8 8 plimitpl 152 32 0 14 1 0 1 1 0 8 0 sigapl 424 504 0 454 7 0 7 7 0 8 1 knotepl 120 67 0 0 3 0 3 3 0 8 0 kqueuepl 224 32 0 18 1 0 1 1 0 8 0 pipepl 344 139 0 112 3 0 3 3 0 8 0 fdescpl 528 486 0 454 3 0 3 3 0 8 0 filepl 160 1763 0 1542 10 0 10 10 0 8 0 lockfpl 104 30 0 26 1 0 1 1 0 8 0 lockfspl 48 17 0 13 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 35 0 18 1 0 1 1 0 8 0 ucredpl 104 113 0 100 1 0 1 1 0 8 0 zombiepl 144 455 0 454 1 0 1 1 0 8 0 processpl 1232 504 0 454 5 0 5 5 0 8 1 procpl 664 582 0 522 6 0 6 6 0 8 0 sockpl 752 186 0 158 4 0 4 4 0 8 1 mcl64k 65536 11 0 0 2 0 2 2 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k128 9344 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k 2048 17 0 0 3 0 3 3 0 8 0 mextrefs 64 17 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 198 0 0 13 0 13 13 0 8 0 bufpl 272 2403 0 106 154 0 154 154 0 8 0 anonpl 32 7566 0 0 61 0 61 61 0 222 0 amapchunkpl 152 9655 0 9146 23 0 23 23 0 158 3 amappl16 200 2075 0 2050 16 5 11 14 0 8 8 amappl15 192 4 0 3 1 0 1 1 0 8 0 amappl14 184 447 0 446 1 0 1 1 0 8 0 amappl13 176 121 0 109 1 0 1 1 0 8 0 amappl12 168 774 0 743 2 0 2 2 0 8 0 amappl11 160 22 0 22 1 1 0 1 0 8 0 amappl10 152 66 0 52 1 0 1 1 0 8 0 amappl9 144 277 0 276 1 0 1 1 0 8 0 amappl8 136 100 0 99 1 0 1 1 0 8 0 amappl7 128 144 0 131 1 0 1 1 0 8 0 amappl6 120 159 0 157 1 0 1 1 0 8 0 amappl5 112 110 0 100 1 0 1 1 0 8 0 amappl4 104 302 0 284 1 0 1 1 0 8 0 amappl3 96 1700 0 1600 3 0 3 3 0 8 0 amappl2 88 600 0 523 2 0 2 2 0 8 0 amappl1 80 10556 0 9949 15 0 15 15 0 8 2 amappl 88 2777 0 2608 5 0 5 5 0 92 0 uvmvnodes 80 99 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 486 0 454 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 486 0 454 1 0 1 1 0 8 0 vmmpekpl 168 6034 0 6003 2 0 2 2 0 8 0 vmmpepl 168 40713 0 38752 97 0 97 97 0 357 7 vmsppl 488 485 0 454 5 0 5 5 0 8 1 rwobjpl 80 15208 0 14185 27 0 27 27 0 8 3 pdppl 4096 981 0 908 97 24 73 87 0 8 0 pvpl 32 18627 0 0 153 2 151 151 0 265 0 pmappl 256 485 0 454 3 0 3 3 0 8 0 extentpl 40 47 0 29 1 0 1 1 0 8 0 phpool 120 427 0 27 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x19: leave x86_ipi_db(ffffffff850c7ff0) 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(ffffffff85449480) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85449480) 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 kasan_shadow_4byte_isvalid(ffffffff85449c78) at kasan_shadow_4byte_isvalid+0x2d kasan_addr_to_shad sys/kern/subr_kasan.c:91 [inline] kasan_shadow_4byte_isvalid(ffffffff85449c78) at kasan_shadow_4byte_isvalid+0x2d sys/kern/kasan_shadow.h:127 __asan_load4_noabort(ffffffff85449c78) at __asan_load4_noabort+0x53 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline] __asan_load4_noabort(ffffffff85449c78) at __asan_load4_noabort+0x53 sys/kern/subr_kasan.c:1098 __mp_lock(ffffffff85449480) at __mp_lock+0x27a __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85449480) at __mp_lock+0x27a sys/kern/kern_lock.c:173 ktrstruct(ffff80003bb5a7f0,ffffffff84c5c520,ffff800039310580,20) at ktrstruct+0x13f sys/kern/kern_ktrace.c:314 sys_kevent(ffff80003bb5a7f0,ffff8000393108b0,ffff800039310820) at sys_kevent+0xacb sys/kern/kern_event.c:1343 syscall(ffff8000393108b0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000393108b0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdcd3bdb4da0, count: 1 ddb{0}> trace x86_ipi_db(ffffffff850c7ff0) 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(ffffffff85449480) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85449480) 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 kasan_shadow_4byte_isvalid(ffffffff85449c78) at kasan_shadow_4byte_isvalid+0x2d kasan_addr_to_shad sys/kern/subr_kasan.c:91 [inline] kasan_shadow_4byte_isvalid(ffffffff85449c78) at kasan_shadow_4byte_isvalid+0x2d sys/kern/kasan_shadow.h:127 __asan_load4_noabort(ffffffff85449c78) at __asan_load4_noabort+0x53 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline] __asan_load4_noabort(ffffffff85449c78) at __asan_load4_noabort+0x53 sys/kern/subr_kasan.c:1098 __mp_lock(ffffffff85449480) at __mp_lock+0x27a __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85449480) at __mp_lock+0x27a sys/kern/kern_lock.c:173 ktrstruct(ffff80003bb5a7f0,ffffffff84c5c520,ffff800039310580,20) at ktrstruct+0x13f sys/kern/kern_ktrace.c:314 sys_kevent(ffff80003bb5a7f0,ffff8000393108b0,ffff800039310820) at sys_kevent+0xacb sys/kern/kern_event.c:1343 syscall(ffff8000393108b0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000393108b0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdcd3bdb4da0, count: -14 ddb{0}> machine ddbcpu 1 Stopped at knote_processfork+0x287: movq 0x8(%r15),%r14 knote_processfork(ffffffff85e32ee0,6495) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85e32b80,f0,ffffffff8349e060,0,0,ffff80003bb28900) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff8349e060,0,0,ffffffff84c49da0) 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(ffff80003bb28b08,1,0,ffff80003bb28ae0,200000000200,0,ffff80003bb28d60) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045ff5a10,ffff80003bb28d60,ffff80003bb28cc0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bb28d60) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb28d60) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdccedc99ec0, count: 7 ddb{1}> trace knote_processfork(ffffffff85e32ee0,6495) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85e32b80,f0,ffffffff8349e060,0,0,ffff80003bb28900) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff8349e060,0,0,ffffffff84c49da0) 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(ffff80003bb28b08,1,0,ffff80003bb28ae0,200000000200,0,ffff80003bb28d60) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045ff5a10,ffff80003bb28d60,ffff80003bb28cc0) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bb28d60) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb28d60) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdccedc99ec0, count: -8