panic: kernel diagnostic assertion "nlevel >= IPL_NONE" failed: file "/syzkaller/managers/multicore/kernel/sys/arch/amd64/amd64/intr.c", line 699 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 348317 10142 0 0x12 0 0 sshd db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279c915) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281f079,ffffffff827a94ce,2bb,ffffffff827a15b3) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(8ef13036) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd80728c8a20) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd80728c8a20) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800021292d58,fffffd80728c8a20,fffffd80728c8aa8,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021292d58,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021292d58) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021292d58,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021292d58,ffff80002feccf50,ffff80002feccfa0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002fecd020) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002fecd020) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e8da1f2f9d0, count: 2 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: kernel diagnostic assertion "nlevel >= IPL_NONE" failed: file "/syzkaller/managers/multicore/kernel/sys/arch/amd64/amd64/intr.c", line 699 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279c915) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281f079,ffffffff827a94ce,2bb,ffffffff827a15b3) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(8ef13036) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd80728c8a20) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd80728c8a20) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800021292d58,fffffd80728c8a20,fffffd80728c8aa8,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021292d58,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021292d58) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021292d58,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021292d58,ffff80002feccf50,ffff80002feccfa0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002fecd020) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002fecd020) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e8da1f2f9d0, count: -13 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002feccb90 rbx 0xffff800020d59b9f rdx 0 rcx 0xffff800021292d58 rax 0xffff800020d58ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x9bc913762603a99c r11 0x8e6a77e7a454777 r12 0xffff800020d599a0 r13 0 r14 0 r15 0x1 rip 0xffffffff81a5e8cc db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002feccb80 ss 0 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.2) pid=3169 stat=onproc flags process=1008 proc=2000 pri=0, usrpri=84, nice=20 forw=0xffffffffffffffff, list=0xffff8000212ff7f0,0xffff8000212932b8 process=0xffff8000212bdd68 user=0xffff80002fec8000, vmspace=0xfffffd8069b503c8 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 36595 168728 57407 0 2 0 syz-executor.5 35408 260620 8289 0 2 0 syz-executor.1 71215 273741 74412 0 2 0 syz-executor.7 28741 186416 86392 0 2 0 syz-executor.4 8289 415156 22222 0 2 0x2 syz-executor.1 742 92086 0 0 3 0x14200 acct acct 86392 294656 22222 0 3 0x82 nanoslp syz-executor.4 87368 422830 0 0 3 0x14200 bored sosplice 300 136256 0 0 3 0x14280 nfsidl nfsio 45200 367967 0 0 3 0x14280 nfsidl nfsio 63552 197892 0 0 3 0x14280 nfsidl nfsio 55976 250092 0 0 3 0x14280 nfsidl nfsio 78067 172679 0 0 3 0x14280 nfsidl nfsio 67925 233797 0 0 3 0x14280 nfsidl nfsio 44491 145833 0 0 3 0x14280 nfsidl nfsio 62173 201481 0 0 3 0x14280 nfsidl nfsio 87724 111154 0 0 3 0x14280 nfsidl nfsio 58314 121452 0 0 3 0x14280 nfsidl nfsio 40948 433015 0 0 3 0x14280 nfsidl nfsio 74851 283006 0 0 3 0x14280 nfsidl nfsio 25722 516654 0 0 3 0x14280 nfsidl nfsio 63364 323075 0 0 3 0x14280 nfsidl nfsio 85199 236102 0 0 3 0x14280 nfsidl nfsio 31661 168228 0 0 3 0x14280 nfsidl nfsio 11932 429095 0 0 3 0x14280 nfsidl nfsio 35342 109242 0 0 3 0x14280 nfsidl nfsio 10572 458966 0 0 3 0x14280 nfsidl nfsio 13598 473435 0 0 3 0x14280 nfsidl nfsio 16910 121709 22222 0 3 0x82 nanoslp syz-executor.2 71 431349 45359 0 3 0x100082 netio arp 45359 128612 1 0 3 0x10008a sigsusp sh 35937 297351 22222 0 2 0x2 syz-executor.6 74412 152915 22222 0 3 0x82 nanoslp syz-executor.7 57407 256212 22222 0 3 0x82 nanoslp syz-executor.5 10689 301031 22222 0 2 0x2 syz-executor.3 3064 172569 22222 0 3 0x82 nanoslp syz-executor.0 22222 207398 27335 0 3 0x2000082 thrsleep syz-fuzzer 22222 90916 27335 0 3 0x6000082 nanoslp syz-fuzzer 22222 514658 27335 0 3 0x6000082 thrsleep syz-fuzzer 22222 53621 27335 0 3 0x6000082 thrsleep syz-fuzzer 22222 402218 27335 0 2 0x6000002 syz-fuzzer 22222 76169 27335 0 3 0x6000082 wait syz-fuzzer 22222 316043 27335 0 3 0x6000082 wait syz-fuzzer 22222 394675 27335 0 3 0x6000082 wait syz-fuzzer 22222 119015 27335 0 3 0x6000082 wait syz-fuzzer 22222 59233 27335 0 3 0x6000082 kqread syz-fuzzer 22222 237910 27335 0 3 0x6000082 thrsleep syz-fuzzer 22222 206133 27335 0 3 0x6000082 wait syz-fuzzer 22222 447851 27335 0 3 0x6000082 thrsleep syz-fuzzer 22222 411453 27335 0 3 0x6000082 wait syz-fuzzer 22222 18769 27335 0 3 0x6000082 wait syz-fuzzer 22222 282770 27335 0 3 0x6000082 wait syz-fuzzer 27335 98416 10142 0 3 0x10008a sigsusp ksh 10142 348317 67828 0 7 0x12 sshd 6467 257653 1 0 3 0x100083 ttyin getty 67828 422087 1 0 3 0x88 kqread sshd 32539 252799 24359 74 3 0x1100092 bpf pflogd 24359 16366 1 0 3 0x80 netio pflogd 40736 452084 17508 73 3 0x1100090 kqread syslogd 17508 112976 1 0 3 0x100082 netio syslogd 47932 15014 1 0 3 0x100080 kqread resolvd 78825 514734 58978 77 3 0x100092 kqread dhcpleased 8204 14410 58978 77 3 0x100092 kqread dhcpleased 58978 348006 1 0 3 0x80 kqread dhcpleased 84087 391271 0 0 3 0x14200 bored smr 55711 263657 0 0 2 0x14200 zerothread 40385 229594 0 0 3 0x14200 aiodoned aiodoned 7362 153850 0 0 3 0x14200 syncer update 32370 4733 0 0 3 0x14200 cleaner cleaner 17100 61858 0 0 2 0x14200 reaper 7908 205360 0 0 3 0x14200 pgdaemon pagedaemon 97443 10755 0 0 3 0x14200 bored viomb 73902 280392 0 0 3 0x40014200 acpi0 acpi0 81823 54368 0 0 3 0x40014200 idle1 11151 49590 0 0 3 0x14200 bored softnet3 19777 133112 0 0 3 0x14200 bored softnet2 90290 337395 0 0 3 0x14200 bored softnet1 81356 380398 0 0 3 0x14200 bored softnet0 52571 34494 0 0 3 0x14200 bored systqmp 96865 417012 0 0 3 0x14200 bored systq 49530 354227 0 0 3 0x40014200 bored softclock 15348 258187 0 0 3 0x40014200 idle0 1 70480 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 10142 (sshd) thread 0xffff8000211eed58 (348317) exclusive rwlock vmmaplk r = 0 (0xfffffd806e3bcbe8) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 vm_map_lock_ln+0xfa sys/uvm/uvm_map.c:5345 #3 uvmfault_lookup+0xb6 sys/uvm/uvm_fault.c:1779 #4 uvm_fault_check+0x65d uvmfault_amapcopy sys/uvm/uvm_fault.c:236 [inline] #4 uvm_fault_check+0x65d sys/uvm/uvm_fault.c:710 #5 uvm_fault+0xf2 sys/uvm/uvm_fault.c:600 #6 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #7 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #8 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10224 6497K 6933K 78643K 14595 0 pcb 13 12K 14K 78643K 275 0 rtable 234 6K 6K 78643K 439 0 pf 32 9K 10K 78643K 61 0 ifaddr 45 15K 15K 78643K 65 0 ifgroup 55 2K 2K 78643K 85 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 36K 78643K 78 0 ioctlops 0 0K 4K 78643K 1635 0 iov 0 0K 24K 78643K 87 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1426 89K 89K 78643K 2279 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 14 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 339 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 17 61K 93K 78643K 1829 0 sigio 0 0K 0K 78643K 9 0 proc 69 91K 140K 78643K 651 0 subproc 117 7K 7K 78643K 143 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 2 0K 0K 78643K 52 0 in_multi 100 7K 7K 78643K 147 0 ether_multi 1 0K 0K 78643K 1 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 229 1023K 1023K 78643K 229 0 exec 0 0K 1K 78643K 639 0 pfkey data 0 0K 0K 78643K 1 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 347 90K 103K 78643K 20279 0 UVM aobj 131 4K 4K 78643K 137 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 54 0 NDP 12 0K 1K 78643K 41 0 temp 74 5920K 5988K 78643K 16485 0 kqueue 12 18K 24K 78643K 172 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 48 0 44 1 0 1 1 0 8 0 rtentry 112 140 0 30 4 0 4 4 0 8 0 unpcb 144 1280 0 1265 15 9 6 6 0 8 5 syncache 304 17 0 17 4 3 1 1 0 8 1 tcpqe 32 179 0 179 5 4 1 1 0 8 1 tcpcb 808 573 0 557 21 12 9 9 0 8 7 arp 120 23 0 5 1 0 1 1 0 8 0 inpcb 368 1405 0 1385 24 16 8 8 0 8 5 nd6 136 30 0 6 1 0 1 1 0 8 0 pkpcb 40 7 0 7 1 1 0 1 0 8 0 kcovpl 48 11 0 2 1 0 1 1 0 8 0 ppxss 1256 3 0 3 1 1 0 1 0 8 0 pffrag 232 28 0 26 1 0 1 1 0 482 0 pffrnode 88 28 0 26 1 0 1 1 0 8 0 pffrent 40 130 0 128 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 78 0 55 1 0 1 1 0 8 0 pfstkey 128 78 0 55 1 0 1 1 0 8 0 pfstate 376 78 0 55 5 2 3 3 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 547 0 91 29 0 29 29 0 8 0 art_table 32 548 0 91 4 0 4 4 0 8 0 art_node 16 135 0 35 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 4 1 0 1 1 0 8 0 semapl 112 337 0 327 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3624 0 2171 92 0 92 92 0 8 0 ffsino 272 3624 0 2171 98 0 98 98 0 8 0 nchpl 144 6641 0 4990 63 0 63 63 0 8 0 uvmvnodes 80 4517 0 0 93 0 93 93 0 8 0 vnodes 216 4517 0 0 251 0 251 251 0 8 0 namei 1024 22042 0 22042 3 2 1 2 0 8 1 percpumem 16 52 0 9 1 0 1 1 0 8 0 vmpool 696 17 0 17 3 2 1 1 0 8 1 kstatmem 264 42 0 18 2 0 2 2 0 8 0 scxspl 216 18032 0 18032 10 9 1 8 1 8 1 plimitpl 152 130 0 113 1 0 1 1 0 8 0 sigapl 424 2171 0 2101 11 2 9 9 0 8 0 futexpl 64 14426 0 14426 3 2 1 1 0 8 1 knotepl 120 373 0 0 11 0 11 11 0 8 0 kqueuepl 216 439 0 431 8 4 4 5 0 8 3 pipepl 320 433 0 402 11 8 3 8 0 8 0 fdescpl 496 2132 0 2102 6 1 5 5 0 8 0 filepl 152 13310 0 13051 29 13 16 18 0 8 5 lockfpl 104 550 0 548 1 0 1 1 0 8 0 lockfspl 48 233 0 231 1 0 1 1 0 8 0 sessionpl 144 27 0 9 1 0 1 1 0 8 0 pgrppl 48 37 0 19 1 0 1 1 0 8 0 ucredpl 104 1348 0 1335 1 0 1 1 0 8 0 zombiepl 144 2103 0 2101 2 1 1 1 0 8 0 processpl 1072 2171 0 2101 5 0 5 5 0 8 0 procpl 680 5217 0 5131 10 1 9 9 0 8 0 sosppl 168 6 0 4 2 1 1 1 0 8 0 sockpl 488 2743 0 2704 37 14 23 23 0 8 16 mcl64k 65536 11 0 0 2 0 2 2 0 8 0 mcl16k 16384 8 0 0 1 0 1 1 0 8 0 mcl12k 12288 7 0 0 1 0 1 1 0 8 0 mcl9k 9216 8 0 0 1 0 1 1 0 8 0 mcl8k 8192 16 0 0 2 0 2 2 0 8 0 mcl4k 4096 19 0 0 3 0 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 287 0 0 36 2 34 36 0 8 0 mtagpl 96 141 0 0 4 0 4 4 0 8 0 mbufpl 256 425 0 0 20 0 20 20 0 8 0 bufpl 288 6212 0 150 433 0 433 433 0 8 0 anonpl 24 333568 0 320151 116 25 91 108 0 186 0 amapchunkpl 152 64997 0 64155 55 14 41 47 0 158 1 amappl16 200 7727 0 7353 39 18 21 32 0 8 0 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 182 0 165 2 1 1 2 0 8 0 amappl13 176 12 0 12 2 2 0 1 0 8 0 amappl12 168 2845 0 2816 3 1 2 2 0 8 0 amappl11 160 60 0 45 1 0 1 1 0 8 0 amappl10 152 74 0 63 1 0 1 1 0 8 0 amappl9 144 223 0 223 5 4 1 1 0 8 1 amappl8 136 283 0 203 3 0 3 3 0 8 0 amappl7 128 88 0 76 2 0 2 2 0 8 0 amappl6 120 290 0 268 2 1 1 2 0 8 0 amappl5 112 222 0 211 1 0 1 1 0 8 0 amappl4 104 660 0 608 3 1 2 3 0 8 0 amappl3 96 12878 0 12806 4 1 3 3 0 8 0 amappl2 88 2435 0 2366 3 0 3 3 0 8 0 amappl1 80 16263 0 15684 23 9 14 23 0 8 0 amappl 88 19654 0 19436 7 0 7 7 0 92 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 72 136 0 6 3 0 3 3 0 8 0 uaddrrnd 24 2149 0 2119 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2149 0 2119 1 0 1 1 0 8 0 vmmpekpl 168 21179 0 21111 4 0 4 4 0 8 0 vmmpepl 168 146420 0 144098 170 58 112 131 0 357 1 vmsppl 464 2148 0 2119 6 1 5 5 0 8 0 rwobjpl 56 46418 0 40250 91 3 88 88 0 8 0 pdppl 4096 4306 0 4238 228 154 74 84 0 8 6 pvpl 32 811135 0 791954 367 162 205 365 0 265 36 pmappl 248 2148 0 2119 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1010 0 190 24 0 24 24 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82bd4ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82cdebd8) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cdebd8) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x52 sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff82cdebd8) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cdebd8) at __mp_lock+0x122 sys/kern/kern_lock.c:147 doppoll(ffff8000211eed58,abf201fc2a0,4,0,ffff80002124b274,ffff80002124b340) at doppoll+0x159 sys/kern/sys_generic.c:950 sys_ppoll(ffff8000211eed58,ffff80002124b2f0,ffff80002124b340) at sys_ppoll+0x137 sys/kern/sys_generic.c:916 syscall(ffff80002124b3c0) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002124b3c0) at syscall+0x606 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73ec866ffbc0, count: 4 ddb{0}> trace x86_ipi_db(ffffffff82bd4ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82cdebd8) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cdebd8) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x52 sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff82cdebd8) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cdebd8) at __mp_lock+0x122 sys/kern/kern_lock.c:147 doppoll(ffff8000211eed58,abf201fc2a0,4,0,ffff80002124b274,ffff80002124b340) at doppoll+0x159 sys/kern/sys_generic.c:950 sys_ppoll(ffff8000211eed58,ffff80002124b2f0,ffff80002124b340) at sys_ppoll+0x137 sys/kern/sys_generic.c:916 syscall(ffff80002124b3c0) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002124b3c0) at syscall+0x606 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73ec866ffbc0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x1c: addq $0x8,%rsp db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279c915) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281f079,ffffffff827a94ce,2bb,ffffffff827a15b3) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(8ef13036) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd80728c8a20) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd80728c8a20) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800021292d58,fffffd80728c8a20,fffffd80728c8aa8,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021292d58,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021292d58) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021292d58,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021292d58,ffff80002feccf50,ffff80002feccfa0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002fecd020) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002fecd020) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e8da1f2f9d0, count: 2 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279c915) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281f079,ffffffff827a94ce,2bb,ffffffff827a15b3) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(8ef13036) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd80728c8a20) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd80728c8a20) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800021292d58,fffffd80728c8a20,fffffd80728c8aa8,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021292d58,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021292d58) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021292d58,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021292d58,ffff80002feccf50,ffff80002feccfa0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002fecd020) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002fecd020) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e8da1f2f9d0, count: -13