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 324229 90972 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827a57c9) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff828214f5,ffffffff8283f7c6,2bb,ffffffff827a5364) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(fe49b86b) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f1461b0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f1461b0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff80002128fd40,fffffd806f1461b0,fffffd806f146238,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002128fd40,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002128fd40) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002128fd40,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002128fd40,ffff80002e467ad0,ffff80002e467b20) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e467ba0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e467ba0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f2d286bada0, 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(ffffffff827a57c9) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff828214f5,ffffffff8283f7c6,2bb,ffffffff827a5364) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(fe49b86b) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f1461b0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f1461b0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff80002128fd40,fffffd806f1461b0,fffffd806f146238,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002128fd40,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002128fd40) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002128fd40,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002128fd40,ffff80002e467ad0,ffff80002e467b20) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e467ba0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e467ba0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f2d286bada0, count: -13 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e467710 rbx 0xffff800020d59b9f rdx 0 rcx 0xffff80002128fd40 rax 0xffff800020d58ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x93e2f4dc35f3810a r11 0xc692078c64218c5b r12 0xffff800020d599a0 r13 0 r14 0 r15 0x1 rip 0xffffffff814d940c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002e467700 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.2) pid=422470 stat=onproc flags process=1018 proc=2000 pri=0, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff8000212692b8,0xffff80002128e810 process=0xffff8000ffff5d68 user=0xffff80002e462000, vmspace=0xfffffd806c72d1e8 estcpu=36, cpticks=3, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 58736 144820 96196 32767 2 0x10 syz-executor.0 37540 113056 79954 32767 2 0x10 syz-executor.4 37540 325707 79954 32767 3 0x4000090 fsleep syz-executor.4 37540 58165 79954 32767 3 0x4000090 fsleep syz-executor.4 93976 132643 53611 32767 2 0x10 syz-executor.6 93976 312558 53611 32767 3 0x4000090 fsleep syz-executor.6 93976 202237 53611 32767 3 0x4000090 fsleep syz-executor.6 93976 213737 53611 32767 3 0x4000090 fsleep syz-executor.6 44924 520980 92371 32767 2 0x10 syz-executor.1 44924 203033 92371 32767 3 0x4000090 fsleep syz-executor.1 86970 160807 39841 32767 2 0x10 syz-executor.5 86970 515064 39841 32767 2 0x4000010 syz-executor.5 86970 435886 39841 32767 2 0x4000010 syz-executor.5 67497 8051 39290 32767 3 0x90 nanoslp syz-executor.2 39290 82037 66770 0 3 0x82 wait syz-executor.2 35556 206131 0 0 3 0x14200 bored sosplice 12538 71294 15184 32767 3 0x90 nanoslp syz-executor.7 15184 350874 66770 0 3 0x82 wait syz-executor.7 53611 128458 4317 32767 3 0x90 nanoslp syz-executor.6 4317 310794 66770 0 3 0x82 wait syz-executor.6 79954 308048 43959 32767 3 0x90 nanoslp syz-executor.4 39841 224435 88002 32767 3 0x90 nanoslp syz-executor.5 88002 400320 66770 0 3 0x82 wait syz-executor.5 43959 340328 66770 0 3 0x82 wait syz-executor.4 92371 290086 28332 32767 3 0x90 nanoslp syz-executor.1 52630 95700 47906 32767 2 0x10 syz-executor.3 28332 81193 66770 0 3 0x82 wait syz-executor.1 47906 371407 66770 0 3 0x82 wait syz-executor.3 96196 104414 49216 32767 3 0x90 nanoslp syz-executor.0 49216 249655 66770 0 3 0x82 wait syz-executor.0 66770 76788 41256 0 3 0x2000082 wait syz-fuzzer 66770 463427 41256 0 3 0x6000082 nanoslp syz-fuzzer 66770 469304 41256 0 3 0x6000082 thrsleep syz-fuzzer 66770 291244 41256 0 3 0x6000082 wait syz-fuzzer 66770 368492 41256 0 3 0x6000082 wait syz-fuzzer 66770 378692 41256 0 3 0x6000082 wait syz-fuzzer 66770 372175 41256 0 3 0x6000082 thrsleep syz-fuzzer 66770 106288 41256 0 3 0x6000082 wait syz-fuzzer 66770 504076 41256 0 3 0x6000082 wait syz-fuzzer 66770 149309 41256 0 3 0x6000082 thrsleep syz-fuzzer 66770 249020 41256 0 3 0x6000082 thrsleep syz-fuzzer 66770 183750 41256 0 3 0x6000082 wait syz-fuzzer 66770 88767 41256 0 3 0x6000082 thrsleep syz-fuzzer 66770 188511 41256 0 3 0x6000082 thrsleep syz-fuzzer 66770 362329 41256 0 3 0x6000082 wait syz-fuzzer 66770 421554 41256 0 3 0x6000082 kqread syz-fuzzer 41256 181165 77135 0 3 0x10008a sigsusp ksh 77135 478946 37400 0 3 0x9a kqread sshd 39410 407570 1 0 3 0x100083 ttyin getty 37400 123378 1 0 3 0x88 kqread sshd 28542 365186 97775 73 3 0x1100090 kqread syslogd 97775 258995 1 0 3 0x100082 netio syslogd 53814 507411 1 0 3 0x100080 kqread resolvd 25743 496887 42933 77 3 0x100092 kqread dhcpleased 4882 148812 42933 77 3 0x100092 kqread dhcpleased 42933 340436 1 0 3 0x80 kqread dhcpleased 54960 23645 0 0 3 0x14200 bored smr 4719 481128 0 0 2 0x14200 zerothread 71885 116552 0 0 3 0x14200 aiodoned aiodoned 98832 344861 0 0 3 0x14200 syncer update 42023 292712 0 0 3 0x14200 cleaner cleaner 90972 324229 0 0 7 0x14200 reaper 26331 201008 0 0 3 0x14200 pgdaemon pagedaemon 95061 177544 0 0 3 0x14200 bored viomb 21991 232428 0 0 3 0x40014200 acpi0 acpi0 55040 338787 0 0 3 0x40014200 idle1 34511 179635 0 0 3 0x14200 bored softnet3 9165 59657 0 0 3 0x14200 bored softnet2 48082 52262 0 0 3 0x14200 bored softnet1 85922 284296 0 0 3 0x14200 bored softnet0 3705 145705 0 0 3 0x14200 bored systqmp 19879 205748 0 0 3 0x14200 bored systq 97223 333935 0 0 3 0x40014200 bored softclock 91637 100925 0 0 3 0x40014200 idle0 1 34852 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806704fca8) #0 witness_lock+0x447 #1 mtx_enter_try+0x104 #2 mtx_enter+0x4f sys/kern/kern_lock.c:266 #3 pmap_enter+0x1c3 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:423 [inline] #3 pmap_enter+0x1c3 sys/arch/amd64/amd64/pmap.c:2710 #4 uvm_fault_lower_lookup+0x2a4 sys/uvm/uvm_fault.c:1192 #5 uvm_fault_lower+0x63 sys/uvm/uvm_fault.c:1227 #6 uvm_fault+0x238 #7 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #8 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 Process 58736 (syz-executor.0) thread 0xffff80002128e800 (144820) exclusive rwlock uobjlk r = 0 (0xfffffd807e646940) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 uvm_fault_lower_lookup+0x4a sys/uvm/uvm_fault.c:1126 #3 uvm_fault_lower+0x63 sys/uvm/uvm_fault.c:1227 #4 uvm_fault+0x238 #5 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #6 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #7 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806c72ddc0) #0 witness_lock+0x447 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1785 #2 uvm_fault_check+0x3e sys/uvm/uvm_fault.c:672 #3 uvm_fault+0xf2 sys/uvm/uvm_fault.c:600 #4 upageflttrap+0x86 sys/arch/amd64/amd64/trap.c:188 #5 usertrap+0x226 sys/arch/amd64/amd64/trap.c:436 #6 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10185 6408K 6420K 78643K 11269 0 pcb 13 10K 12K 78643K 15 0 rtable 238 6K 7K 78643K 509 0 pf 29 8K 8K 78643K 33 0 ifaddr 44 15K 15K 78643K 54 0 ifgroup 50 2K 2K 78643K 58 0 sysctl 3 1K 1K 78643K 3 0 counters 60 35K 35K 78643K 64 0 ioctlops 0 0K 2K 78643K 31 0 iov 0 0K 16K 78643K 213 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1279 80K 80K 78643K 1712 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 28 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 452 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 24 89K 113K 78643K 4102 0 sigio 0 0K 0K 78643K 47 0 proc 56 78K 115K 78643K 604 0 subproc 104 6K 6K 78643K 130 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 89 0 in_multi 99 7K 7K 78643K 147 0 ether_multi 1 0K 0K 78643K 4 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 49 228K 228K 78643K 49 0 exec 0 0K 1K 78643K 691 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 383 89K 94K 78643K 39855 0 UVM aobj 131 4K 4K 78643K 134 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 83 0 NDP 11 0K 2K 78643K 33 0 temp 73 5916K 5996K 78643K 12495 0 kqueue 12 18K 24K 78643K 157 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 120 161 0 158 3 2 1 3 0 8 0 rtentry 112 137 0 25 4 0 4 4 0 8 0 unpcb 144 1156 0 1143 21 15 6 6 0 8 5 syncache 304 23 0 23 5 5 0 1 0 8 0 tcpqe 32 311 0 311 4 4 0 1 0 8 0 tcpcb 808 721 0 709 22 20 2 11 0 8 0 arp 120 23 0 4 1 0 1 1 0 8 0 ipq 40 36 0 35 3 2 1 1 0 8 0 ipqe 40 143 0 142 3 2 1 1 0 8 0 inpcb 368 3260 0 3206 32 24 8 14 0 8 2 nd6 136 33 0 8 1 0 1 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 548 0 92 29 0 29 29 0 8 0 art_table 32 549 0 92 4 0 4 4 0 8 0 art_node 16 136 0 34 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 450 0 440 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 6135 0 4696 91 0 91 91 0 8 0 ffsino 272 6135 0 4696 97 0 97 97 0 8 0 nchpl 144 11115 0 9473 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 30481 0 30481 3 2 1 2 0 8 1 percpumem 16 45 0 2 1 0 1 1 0 8 0 kstatmem 264 26 0 4 2 0 2 2 0 8 0 scxspl 216 39095 0 39095 18 15 3 8 1 8 3 plimitpl 152 342 0 318 2 1 1 2 0 8 0 sigapl 424 4393 0 4339 7 0 7 7 0 8 0 futexpl 64 49039 0 49033 2 1 1 1 0 8 0 knotepl 120 114 0 0 4 0 4 4 0 8 0 kqueuepl 216 583 0 575 17 16 1 5 0 8 0 pipepl 320 589 0 561 16 8 8 8 0 8 5 fdescpl 496 4375 0 4340 7 2 5 6 0 8 0 filepl 152 16862 0 16585 34 17 17 17 0 8 6 lockfpl 104 188 0 186 1 0 1 1 0 8 0 lockfspl 48 70 0 68 1 0 1 1 0 8 0 sessionpl 144 25 0 9 1 0 1 1 0 8 0 pgrppl 48 1570 0 1554 1 0 1 1 0 8 0 ucredpl 104 2034 0 2016 1 0 1 1 0 8 0 zombiepl 144 4341 0 4339 1 0 1 1 0 8 0 processpl 1072 4393 0 4339 4 0 4 4 0 8 0 procpl 680 10281 0 10204 11 3 8 8 0 8 1 sosppl 168 19 0 19 3 2 1 1 0 8 1 sockpl 488 4604 0 4535 78 65 13 22 0 8 4 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 25 0 0 2 0 2 2 0 8 0 mcl8k 8192 33 0 0 4 1 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 269 0 0 34 0 34 34 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 943 0 0 57 0 57 57 0 8 0 bufpl 288 10402 0 4076 452 0 452 452 0 8 0 anonpl 24 478338 0 467104 103 25 78 98 0 186 3 amapchunkpl 152 126541 0 125630 54 15 39 46 0 158 1 amappl16 200 8572 0 8294 21 5 16 16 0 8 1 amappl15 192 21 0 20 2 1 1 1 0 8 0 amappl14 184 239 0 227 2 1 1 2 0 8 0 amappl13 176 12 0 12 2 2 0 1 0 8 0 amappl12 168 5038 0 5001 2 0 2 2 0 8 0 amappl11 160 67 0 56 1 0 1 1 0 8 0 amappl10 152 39 0 28 1 0 1 1 0 8 0 amappl9 144 224 0 223 1 0 1 1 0 8 0 amappl8 136 332 0 241 5 1 4 4 0 8 0 amappl7 128 105 0 89 2 1 1 2 0 8 0 amappl6 120 263 0 243 1 0 1 1 0 8 0 amappl5 112 251 0 243 1 0 1 1 0 8 0 amappl4 104 626 0 590 2 0 2 2 0 8 0 amappl3 96 26557 0 26461 4 1 3 3 0 8 0 amappl2 88 4771 0 4696 3 1 2 3 0 8 0 amappl1 80 23070 0 22537 22 9 13 22 0 8 0 amappl 88 39243 0 38991 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 72 133 0 3 3 0 3 3 0 8 0 uaddrrnd 24 4375 0 4340 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4375 0 4340 1 0 1 1 0 8 0 vmmpekpl 168 31706 0 31648 3 0 3 3 0 8 0 vmmpepl 168 261101 0 258728 132 23 109 116 0 357 1 vmsppl 464 4374 0 4340 7 2 5 6 0 8 0 rwobjpl 56 70894 0 63510 107 2 105 105 0 8 0 pdppl 4096 8757 0 8680 167 86 81 89 0 8 4 pvpl 32 1408713 0 1391311 334 105 229 332 0 265 83 pmappl 248 4374 0 4340 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1015 0 138 26 0 26 26 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82c39ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x41 sys/dev/kcov.c:164 intr_handler(ffff8000211b9840,ffff80000027b600) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge26_untramp() at Xintr_ioapic_edge26_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 sys/dev/kcov.c:158 msleep(ffffffff82cb09f8,ffffffff82be1ad0,4,ffffffff8285e49b,0) at msleep+0x3d sys/kern/kern_synch.c:213 reaper(ffff8000211b2ff8) at reaper+0xdb sys/kern/kern_exit.c:437 end trace frame: 0x0, count: 6 ddb{0}> trace x86_ipi_db(ffffffff82c39ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x41 sys/dev/kcov.c:164 intr_handler(ffff8000211b9840,ffff80000027b600) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge26_untramp() at Xintr_ioapic_edge26_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 sys/dev/kcov.c:158 msleep(ffffffff82cb09f8,ffffffff82be1ad0,4,ffffffff8285e49b,0) at msleep+0x3d sys/kern/kern_synch.c:213 reaper(ffff8000211b2ff8) 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(ffffffff827a57c9) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff828214f5,ffffffff8283f7c6,2bb,ffffffff827a5364) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(fe49b86b) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f1461b0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f1461b0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff80002128fd40,fffffd806f1461b0,fffffd806f146238,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002128fd40,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002128fd40) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002128fd40,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002128fd40,ffff80002e467ad0,ffff80002e467b20) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e467ba0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e467ba0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f2d286bada0, count: 2 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827a57c9) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff828214f5,ffffffff8283f7c6,2bb,ffffffff827a5364) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(fe49b86b) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f1461b0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f1461b0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff80002128fd40,fffffd806f1461b0,fffffd806f146238,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002128fd40,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002128fd40) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002128fd40,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002128fd40,ffff80002e467ad0,ffff80002e467b20) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e467ba0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e467ba0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f2d286bada0, count: -13