panic: kernel diagnostic assertion "nlevel >= IPL_NONE" failed: file "/syzkaller/managers/setuid/kernel/sys/arch/amd64/amd64/intr.c", line 699 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 419770 17207 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279dc9a) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820322,ffffffff8283c727,2bb,ffffffff827a1c2e) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(d4c3a5b4) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f564bd0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f564bd0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff8000211f5558,fffffd806f564bd0,fffffd806f564c58,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211f5558,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211f5558) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211f5558,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000211f5558,ffff800024721030,ffff800024721080) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800024721100) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800024721100) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6f9e8f500a10, 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/setuid/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(ffffffff8279dc9a) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820322,ffffffff8283c727,2bb,ffffffff827a1c2e) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(d4c3a5b4) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f564bd0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f564bd0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff8000211f5558,fffffd806f564bd0,fffffd806f564c58,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211f5558,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211f5558) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211f5558,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000211f5558,ffff800024721030,ffff800024721080) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800024721100) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800024721100) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6f9e8f500a10, count: -13 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800024720c70 rbx 0xffff800020d59b9f rdx 0 rcx 0xffff8000211f5558 rax 0xffff800020d58ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x72206fe3bdab4305 r11 0x6d8866710aaf8c4f r12 0xffff800020d599a0 r13 0 r14 0 r15 0x1 rip 0xffffffff814c2d0c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800024720c60 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.6) pid=350660 stat=onproc flags process=1018 proc=2000 pri=0, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800021299d40,0xffff8000211f5d60 process=0xffff800028b90878 user=0xffff80002471c000, vmspace=0xfffffd807d84b598 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 4499 308265 34329 32767 2 0x10 syz-executor.3 4499 116275 34329 32767 2 0x4000010 syz-executor.3 29913 280160 5872 32767 2 0x10 syz-executor.1 29913 17517 5872 32767 2 0x4000010 syz-executor.1 60583 305959 94902 32767 2 0x10 syz-executor.5 60583 44589 94902 32767 2 0x4000010 syz-executor.5 90598 51335 28026 32767 2 0x10 syz-executor.7 90598 144145 28026 32767 2 0x4000010 syz-executor.7 99416 73890 93025 32767 2 0x10 syz-executor.0 99416 89952 93025 32767 2 0x4000010 syz-executor.0 63385 34756 67565 32767 2 0x10 syz-executor.4 34329 417786 82441 32767 3 0x90 nanoslp syz-executor.3 82441 37217 6362 0 3 0x82 wait syz-executor.3 28026 109711 75387 32767 3 0x90 nanoslp syz-executor.7 75387 53698 6362 0 3 0x82 wait syz-executor.7 29543 132283 45071 32767 2 0x10 syz-executor.2 45071 452649 6362 0 3 0x82 wait syz-executor.2 94902 37903 33110 32767 3 0x90 nanoslp syz-executor.5 33110 407316 6362 0 3 0x82 wait syz-executor.5 67565 452127 36341 32767 2 0x10 syz-executor.4 36341 470705 6362 0 3 0x82 wait syz-executor.4 5872 467116 38531 32767 2 0x10 syz-executor.1 38531 265150 6362 0 3 0x82 wait syz-executor.1 14527 69718 74265 32767 3 0x90 nanoslp syz-executor.6 74265 226813 6362 0 3 0x82 wait syz-executor.6 93025 128749 10992 32767 2 0x10 syz-executor.0 10992 336332 6362 0 3 0x82 wait syz-executor.0 30208 427658 0 0 3 0x14200 bored sosplice 6362 165095 88580 0 3 0x2000082 thrsleep syz-fuzzer 6362 466725 88580 0 3 0x6000082 thrsleep syz-fuzzer 6362 360743 88580 0 3 0x6000082 wait syz-fuzzer 6362 177486 88580 0 3 0x6000082 wait syz-fuzzer 6362 487343 88580 0 3 0x6000082 wait syz-fuzzer 6362 36334 88580 0 3 0x6000082 wait syz-fuzzer 6362 505345 88580 0 3 0x6000082 wait syz-fuzzer 6362 112125 88580 0 3 0x6000082 wait syz-fuzzer 6362 77585 88580 0 3 0x6000082 thrsleep syz-fuzzer 6362 457106 88580 0 3 0x6000082 thrsleep syz-fuzzer 6362 387135 88580 0 3 0x6000082 thrsleep syz-fuzzer 6362 206122 88580 0 3 0x6000082 wait syz-fuzzer 6362 522466 88580 0 3 0x6000082 wait syz-fuzzer 6362 379108 88580 0 3 0x6000082 kqread syz-fuzzer 6362 472089 88580 0 3 0x6000082 thrsleep syz-fuzzer 6362 484504 88580 0 3 0x6000082 thrsleep syz-fuzzer 88580 401543 62106 0 3 0x10008a sigsusp ksh 62106 125766 63744 0 3 0x9a kqread sshd 6969 128914 1 0 3 0x100083 ttyin getty 63744 338765 1 0 3 0x88 kqread sshd 16897 163668 21727 73 3 0x1100090 kqread syslogd 21727 177094 1 0 3 0x100082 netio syslogd 3341 332180 1 0 3 0x100080 kqread resolvd 4570 516092 4416 77 3 0x100092 kqread dhcpleased 6316 506782 4416 77 3 0x100092 kqread dhcpleased 4416 264933 1 0 3 0x80 kqread dhcpleased 99594 440012 0 0 3 0x14200 bored smr 49183 224743 0 0 2 0x14200 zerothread 4587 353816 0 0 3 0x14200 aiodoned aiodoned 87376 185422 0 0 3 0x14200 syncer update 14013 73077 0 0 3 0x14200 cleaner cleaner 17207 419770 0 0 7 0x14200 reaper 35645 186548 0 0 3 0x14200 pgdaemon pagedaemon 16073 243737 0 0 3 0x14200 bored viomb 93989 191540 0 0 3 0x40014200 acpi0 acpi0 24420 521810 0 0 3 0x40014200 idle1 64665 286914 0 0 3 0x14200 bored softnet3 15807 161509 0 0 3 0x14200 bored softnet2 61622 167468 0 0 3 0x14200 bored softnet1 26045 489234 0 0 3 0x14200 bored softnet0 23484 415617 0 0 3 0x14200 bored systqmp 82143 401442 0 0 3 0x14200 bored systq 91973 60666 0 0 3 0x40014200 bored softclock 37018 383462 0 0 3 0x40014200 idle0 1 255012 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 99416 (syz-executor.0) thread 0xffff8000212997f0 (89952) exclusive rwlock vmmaplk r = 0 (0xfffffd807d84b860) #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 10215 6413K 6420K 78643K 11439 0 pcb 13 12K 14K 78643K 17 0 rtable 236 6K 7K 78643K 2369 0 pf 29 8K 8K 78643K 125 0 ifaddr 44 15K 16K 78643K 242 0 ifgroup 50 2K 2K 78643K 242 0 sysctl 3 1K 3K 78643K 6 0 counters 60 35K 35K 78643K 156 0 ioctlops 0 0K 2K 78643K 165 0 iov 0 0K 32K 78643K 1857 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1279 80K 80K 78643K 6008 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 235 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 19 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 25 93K 117K 78643K 20274 0 sigio 0 0K 0K 78643K 2382 0 proc 56 78K 115K 78643K 3091 0 subproc 104 6K 6K 78643K 728 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1612 0 in_multi 99 7K 7K 78643K 804 0 ether_multi 1 0K 0K 78643K 20 0 mrt 1 0K 0K 78643K 2 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 3211 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 470 93K 106K 78643K 199977 0 UVM aobj 131 4K 5K 78643K 159 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 478 0 NDP 11 0K 2K 78643K 171 0 temp 74 5920K 6048K 78643K 53473 0 kqueue 12 18K 28K 78643K 1718 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 120 968 0 965 12 11 1 3 0 8 0 rtentry 112 684 0 573 4 0 4 4 0 8 0 unpcb 144 10476 0 10463 127 126 1 10 0 8 0 syncache 304 230 0 230 38 38 0 1 0 8 0 tcpqe 32 483 0 483 32 32 0 1 0 8 0 tcpcb 808 17237 0 17209 272 262 10 19 0 8 6 arp 120 117 0 99 1 0 1 1 0 8 0 ipq 40 30 0 30 11 11 0 1 0 8 0 ipqe 40 222 0 222 11 11 0 1 0 8 0 inpcb 368 32691 0 32661 352 340 12 27 0 8 8 nd6 136 210 0 185 2 0 2 2 0 8 0 kcovpl 48 56 0 48 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2803 0 2341 38 8 30 31 0 8 1 art_table 32 2804 0 2341 4 0 4 4 0 8 0 art_node 16 683 0 582 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 12 0 2 1 0 1 1 0 8 0 shmpl 112 156 0 28 5 1 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 27825 0 26340 94 0 94 94 0 8 0 ffsino 272 27825 0 26340 100 0 100 100 0 8 0 nchpl 144 54519 0 52875 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 177239 0 177239 4 3 1 2 0 8 1 percpumem 16 91 0 48 1 0 1 1 0 8 0 kstatmem 264 118 0 96 2 0 2 2 0 8 0 scxspl 216 159876 0 159876 71 70 1 8 1 8 1 plimitpl 152 3056 0 3033 25 24 1 2 0 8 0 sigapl 424 20461 0 20407 7 0 7 7 0 8 0 futexpl 64 174327 0 174327 2 1 1 1 0 8 1 knotepl 120 1192 0 0 18 0 18 18 0 8 0 kqueuepl 216 5262 0 5254 98 97 1 7 0 8 0 pipepl 320 5893 0 5865 154 151 3 13 0 8 0 fdescpl 496 20443 0 20407 7 2 5 6 0 8 0 filepl 152 137098 0 136863 222 209 13 21 0 8 3 lockfpl 104 7722 0 7720 4 3 1 2 0 8 0 lockfspl 48 2139 0 2137 1 0 1 1 0 8 0 sessionpl 144 71 0 55 1 0 1 1 0 8 0 pgrppl 48 226 0 210 1 0 1 1 0 8 0 ucredpl 104 21804 0 21786 1 0 1 1 0 8 0 zombiepl 144 20408 0 20407 1 0 1 1 0 8 0 processpl 1072 20461 0 20407 4 0 4 4 0 8 0 procpl 680 56799 0 56725 44 36 8 8 0 8 1 sosppl 168 322 0 320 20 19 1 1 0 8 0 sockpl 488 45184 0 45137 790 775 15 40 0 8 7 mcl64k 65536 43 0 0 3 0 3 3 0 8 0 mcl16k 16384 33 0 0 3 0 3 3 0 8 0 mcl12k 12288 49 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 33 0 0 4 1 3 3 0 8 0 mcl4k 4096 84 0 0 5 1 4 4 0 8 0 mcl2k2 2112 12 0 0 1 0 1 1 0 8 0 mcl2k 2048 544 0 0 41 28 13 41 0 8 0 mtagpl 96 26 0 0 1 0 1 1 0 8 0 mbufpl 256 1902 0 0 102 0 102 102 0 8 0 bufpl 288 35379 0 29056 452 0 452 452 0 8 0 anonpl 24 2059163 0 2047932 221 128 93 113 0 186 0 amapchunkpl 152 628611 0 627704 136 96 40 47 0 158 2 amappl16 200 46785 0 46502 276 257 19 41 0 8 1 amappl15 192 11 0 11 1 1 0 1 0 8 0 amappl14 184 312 0 299 2 1 1 2 0 8 0 amappl13 176 6 0 6 2 2 0 1 0 8 0 amappl12 168 21826 0 21784 3 1 2 2 0 8 0 amappl11 160 60 0 47 1 0 1 1 0 8 0 amappl10 152 119 0 106 1 0 1 1 0 8 0 amappl9 144 481 0 480 1 0 1 1 0 8 0 amappl8 136 1171 0 966 8 0 8 8 0 8 0 amappl7 128 174 0 158 2 0 2 2 0 8 0 amappl6 120 740 0 716 2 1 1 2 0 8 0 amappl5 112 738 0 727 1 0 1 1 0 8 0 amappl4 104 1260 0 1219 3 1 2 3 0 8 0 amappl3 96 122988 0 122891 8 5 3 4 0 8 0 amappl2 88 21360 0 21284 3 1 2 3 0 8 0 amappl1 80 82174 0 81639 22 10 12 22 0 8 0 amappl 88 198581 0 198312 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 72 158 0 28 3 0 3 3 0 8 0 uaddrrnd 24 20443 0 20407 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 20443 0 20407 1 0 1 1 0 8 0 vmmpekpl 168 171442 0 171385 3 0 3 3 0 8 0 vmmpepl 168 1201979 0 1199424 412 288 124 137 0 357 0 vmsppl 464 20442 0 20407 7 2 5 6 0 8 0 rwobjpl 56 300730 0 293223 117 6 111 113 0 8 0 pdppl 4096 40894 0 40814 736 654 82 92 0 8 2 pvpl 32 5860119 0 5842240 632 464 168 360 0 265 1 pmappl 248 20442 0 20407 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2257 0 1335 27 0 27 27 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82c1fff0) 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(ffffffff82c97058) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c97058) at __mp_lock+0x129 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_release_all(ffffffff82c97058) at __mp_release_all+0x19 sys/kern/kern_lock.c:178 msleep(ffffffff82cab180,ffffffff82bbbe90,4,ffffffff8285b851,0) at msleep+0x156 sys/kern/kern_synch.c:234 reaper(ffff8000211b3548) at reaper+0xdb sys/kern/kern_exit.c:437 end trace frame: 0x0, count: 6 ddb{0}> trace x86_ipi_db(ffffffff82c1fff0) 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(ffffffff82c97058) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c97058) at __mp_lock+0x129 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_release_all(ffffffff82c97058) at __mp_release_all+0x19 sys/kern/kern_lock.c:178 msleep(ffffffff82cab180,ffffffff82bbbe90,4,ffffffff8285b851,0) at msleep+0x156 sys/kern/kern_synch.c:234 reaper(ffff8000211b3548) at reaper+0xdb sys/kern/kern_exit.c:437 end trace frame: 0x0, count: -9 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(ffffffff8279dc9a) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820322,ffffffff8283c727,2bb,ffffffff827a1c2e) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(d4c3a5b4) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f564bd0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f564bd0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff8000211f5558,fffffd806f564bd0,fffffd806f564c58,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211f5558,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211f5558) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211f5558,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000211f5558,ffff800024721030,ffff800024721080) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800024721100) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800024721100) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6f9e8f500a10, count: 2 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279dc9a) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820322,ffffffff8283c727,2bb,ffffffff827a1c2e) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(d4c3a5b4) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f564bd0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f564bd0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff8000211f5558,fffffd806f564bd0,fffffd806f564c58,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211f5558,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211f5558) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211f5558,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000211f5558,ffff800024721030,ffff800024721080) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800024721100) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800024721100) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6f9e8f500a10, count: -13