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 136891 36002 0 0x2 0 0 syz-executor.0 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(807d3fd8) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd8075f291b0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd8075f291b0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800027ba0568,fffffd8075f291b0,fffffd8075f29238,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800027ba0568,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800027ba0568) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800027ba0568,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800027ba0568,ffff800027b92fc0,ffff800027b93010) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800027b93090) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800027b93090) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74f16038a130, 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(807d3fd8) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd8075f291b0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd8075f291b0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800027ba0568,fffffd8075f291b0,fffffd8075f29238,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800027ba0568,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800027ba0568) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800027ba0568,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800027ba0568,ffff800027b92fc0,ffff800027b93010) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800027b93090) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800027b93090) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74f16038a130, count: -13 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800027b92c00 rbx 0xffff800020d59b9f rdx 0 rcx 0xffff800027ba0568 rax 0xffff800020d58ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x2c7174832c4ad3b2 r11 0xa8ec9d9fa4e777f4 r12 0xffff800020d599a0 r13 0 r14 0 r15 0x1 rip 0xffffffff81a5e8cc db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800027b92bf0 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=455977 stat=onproc flags process=1008 proc=2000 pri=0, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff800027ba02c0,0xffff8000212132c8 process=0xffff8000ffff4880 user=0xffff800027b8e000, vmspace=0xfffffd8069a39928 estcpu=32, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 2566 193904 25475 0 2 0 syz-executor.4 2566 47221 25475 0 3 0x4000080 kqread syz-executor.4 2566 205440 25475 0 3 0x4000080 fsleep syz-executor.4 14575 270260 85186 0 2 0 syz-executor.6 14575 448473 85186 0 3 0x4000080 fsleep syz-executor.6 8521 124563 2518 0 2 0 syz-executor.2 8521 433275 2518 0 3 0x4000080 lockf syz-executor.2 8521 468945 2518 0 3 0x4000080 fsleep syz-executor.2 8521 14205 2518 0 3 0x4000080 fsleep syz-executor.2 28764 431696 54586 0 2 0 syz-executor.7 28764 12713 54586 0 2 0x4000000 syz-executor.7 28764 330785 54586 0 2 0x4000000 syz-executor.7 56803 163702 91856 0 2 0 syz-executor.5 56803 192514 91856 0 3 0x4000080 fsleep syz-executor.5 25475 92299 23970 0 3 0x82 nanoslp syz-executor.4 53887 4946 0 0 3 0x14200 acct acct 2518 68029 23970 0 3 0x82 nanoslp syz-executor.2 94254 57783 0 0 3 0x14200 bored sosplice 6158 521605 0 0 3 0x14280 nfsidl nfsio 69056 80286 0 0 3 0x14280 nfsidl nfsio 62561 328758 0 0 3 0x14280 nfsidl nfsio 27866 408741 0 0 3 0x14280 nfsidl nfsio 40487 288299 0 0 3 0x14280 nfsidl nfsio 17790 305804 0 0 3 0x14280 nfsidl nfsio 5266 375730 0 0 3 0x14280 nfsidl nfsio 30887 395178 0 0 3 0x14280 nfsidl nfsio 37555 322473 0 0 3 0x14280 nfsidl nfsio 28703 256888 0 0 3 0x14280 nfsidl nfsio 41043 92584 0 0 3 0x14280 nfsidl nfsio 17241 438325 0 0 3 0x14280 nfsidl nfsio 59233 217128 0 0 3 0x14280 nfsidl nfsio 13934 477158 0 0 3 0x14280 nfsidl nfsio 53971 434222 0 0 3 0x14280 nfsidl nfsio 17141 344363 0 0 3 0x14280 nfsidl nfsio 47415 461865 0 0 3 0x14280 nfsidl nfsio 5612 224414 0 0 3 0x14280 nfsidl nfsio 69801 164815 0 0 3 0x14280 nfsidl nfsio 71378 45271 0 0 3 0x14280 nfsidl nfsio 54586 318522 23970 0 3 0x82 nanoslp syz-executor.7 91856 135268 23970 0 3 0x82 nanoslp syz-executor.5 85186 420530 23970 0 3 0x82 nanoslp syz-executor.6 19688 143390 23970 0 3 0x82 nanoslp syz-executor.1 86114 104603 23970 0 2 0x2 syz-executor.3 36002 136891 23970 0 7 0x2 syz-executor.0 23970 229031 49069 0 3 0x2000082 kqread syz-fuzzer 23970 511780 49069 0 3 0x6000082 nanoslp syz-fuzzer 23970 413169 49069 0 3 0x6000082 wait syz-fuzzer 23970 11727 49069 0 3 0x6000082 wait syz-fuzzer 23970 448221 49069 0 3 0x6000082 thrsleep syz-fuzzer 23970 126878 49069 0 3 0x6000082 wait syz-fuzzer 23970 97846 49069 0 3 0x6000082 thrsleep syz-fuzzer 23970 152664 49069 0 3 0x6000082 wait syz-fuzzer 23970 273040 49069 0 3 0x6000082 wait syz-fuzzer 23970 508044 49069 0 3 0x6000082 thrsleep syz-fuzzer 23970 79575 49069 0 3 0x6000082 thrsleep syz-fuzzer 23970 402777 49069 0 3 0x6000082 wait syz-fuzzer 23970 56779 49069 0 3 0x6000082 wait syz-fuzzer 23970 306734 49069 0 3 0x6000082 thrsleep syz-fuzzer 23970 276673 49069 0 3 0x6000082 wait syz-fuzzer 49069 252763 42792 0 3 0x10008a sigsusp ksh 42792 405365 89158 0 3 0x9a kqread sshd 86660 243325 1 0 3 0x100083 ttyin getty 89158 229773 1 0 3 0x88 kqread sshd 17486 279345 16033 74 3 0x1100092 bpf pflogd 16033 44889 1 0 3 0x80 netio pflogd 94386 425823 6040 73 3 0x1100090 kqread syslogd 6040 267684 1 0 3 0x100082 netio syslogd 46091 1558 1 0 3 0x100080 kqread resolvd 30776 322969 30340 77 3 0x100092 kqread dhcpleased 97742 308857 30340 77 3 0x100092 kqread dhcpleased 30340 80143 1 0 3 0x80 kqread dhcpleased 18775 140631 0 0 3 0x14200 bored smr 98628 230724 0 0 2 0x14200 zerothread 39199 346787 0 0 3 0x14200 aiodoned aiodoned 67038 411538 0 0 3 0x14200 syncer update 55964 341637 0 0 3 0x14200 cleaner cleaner 73226 352569 0 0 2 0x14200 reaper 41079 440779 0 0 3 0x14200 pgdaemon pagedaemon 48601 433005 0 0 3 0x14200 bored viomb 87829 247163 0 0 3 0x40014200 acpi0 acpi0 97318 78009 0 0 3 0x40014200 idle1 89299 331252 0 0 3 0x14200 bored softnet3 41103 381270 0 0 3 0x14200 bored softnet2 98411 211026 0 0 3 0x14200 bored softnet1 96715 169245 0 0 3 0x14200 bored softnet0 50339 517958 0 0 3 0x14200 bored systqmp 19586 257150 0 0 3 0x14200 bored systq 51503 420116 0 0 3 0x40014200 bored softclock 19169 439043 0 0 3 0x40014200 idle0 1 49869 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10204 6559K 6827K 78643K 13792 0 pcb 20 14K 18K 78643K 1673 0 rtable 239 7K 7K 78643K 677 0 pf 32 9K 10K 78643K 59 0 ifaddr 45 15K 15K 78643K 63 0 ifgroup 55 2K 2K 78643K 75 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 36K 78643K 76 0 ioctlops 0 0K 4K 78643K 1554 0 iov 0 0K 20K 78643K 94 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1344 84K 84K 78643K 2513 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 26 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 144 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 16 57K 85K 78643K 2097 0 sigio 0 0K 0K 78643K 13 0 proc 68 91K 128K 78643K 677 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 63 0 in_multi 99 7K 7K 78643K 142 0 ether_multi 1 0K 0K 78643K 1 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 73 334K 334K 78643K 73 0 exec 0 0K 1K 78643K 844 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 373 88K 93K 78643K 23136 0 UVM aobj 131 4K 5K 78643K 137 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 45 0 NDP 12 0K 0K 78643K 40 0 temp 74 5916K 5994K 78643K 16551 0 kqueue 12 18K 24K 78643K 207 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 120 142 0 139 3 2 1 3 0 8 0 rtentry 112 169 0 58 4 0 4 4 0 8 0 unpcb 144 1394 0 1376 15 14 1 7 0 8 0 syncache 304 24 0 24 5 4 1 1 0 8 1 tcpqe 32 129 0 129 2 2 0 1 0 8 0 tcpcb 808 430 0 414 19 10 9 9 0 8 7 arp 120 23 0 4 1 0 1 1 0 8 0 inpcb 368 3070 0 3040 45 34 11 15 0 8 8 nd6 136 30 0 6 1 0 1 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1256 6 0 6 2 2 0 1 0 8 0 pffrag 232 12 0 8 1 0 1 1 0 482 0 pffrnode 88 12 0 8 1 0 1 1 0 8 0 pffrent 40 38 0 34 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 74 0 62 1 0 1 1 0 8 0 pfstkey 128 74 0 62 2 0 2 2 0 8 0 pfstate 376 74 0 62 4 2 2 4 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 256 544 0 88 29 0 29 29 0 8 0 art_table 32 545 0 88 4 0 4 4 0 8 0 art_node 16 133 0 32 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 6 1 0 1 1 0 8 0 semapl 112 142 0 132 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 4600 0 3147 92 0 92 92 0 8 0 ffsino 272 4600 0 3147 98 0 98 98 0 8 0 nchpl 144 7685 0 6026 63 0 63 63 0 8 0 uvmvnodes 80 5268 0 0 108 0 108 108 0 8 0 vnodes 216 5268 0 0 293 0 293 293 0 8 0 namei 1024 25493 0 25493 3 2 1 2 0 8 1 percpumem 16 51 0 8 1 0 1 1 0 8 0 vmpool 696 3 0 3 1 1 0 1 0 8 0 kstatmem 264 40 0 16 2 0 2 2 0 8 0 scxspl 216 23119 0 23119 14 13 1 8 1 8 1 plimitpl 152 271 0 255 1 0 1 1 0 8 0 sigapl 424 2438 0 2370 9 1 8 8 0 8 0 futexpl 64 15458 0 15453 1 0 1 1 0 8 0 knotepl 120 223 0 0 6 0 6 6 0 8 0 kqueuepl 216 509 0 500 9 4 5 5 0 8 4 pipepl 320 415 0 386 12 9 3 8 0 8 0 fdescpl 496 2399 0 2370 5 1 4 5 0 8 0 filepl 152 15758 0 15495 40 24 16 19 0 8 5 lockfpl 104 614 0 607 2 0 2 2 0 8 1 lockfspl 48 231 0 227 1 0 1 1 0 8 0 sessionpl 144 26 0 9 1 0 1 1 0 8 0 pgrppl 48 43 0 26 1 0 1 1 0 8 0 ucredpl 104 2912 0 2900 1 0 1 1 0 8 0 zombiepl 144 2371 0 2370 1 0 1 1 0 8 0 processpl 1072 2438 0 2370 5 0 5 5 0 8 0 procpl 680 6017 0 5925 12 3 9 9 0 8 0 sosppl 168 14 0 11 2 1 1 1 0 8 0 sockpl 488 4617 0 4570 92 78 14 25 0 8 7 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 8 0 0 1 0 1 1 0 8 0 mcl12k 12288 12 0 0 2 0 2 2 0 8 0 mcl9k 9216 9 0 0 1 0 1 1 0 8 0 mcl8k 8192 18 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 251 0 0 32 0 32 32 0 8 0 mtagpl 96 373 0 0 9 0 9 9 0 8 0 mbufpl 256 592 0 0 33 0 33 33 0 8 0 bufpl 288 7014 0 688 452 0 452 452 0 8 0 anonpl 24 384818 0 371114 103 13 90 97 0 186 0 amapchunkpl 152 74327 0 73435 47 9 38 42 0 158 0 amappl16 200 9252 0 8820 30 6 24 29 0 8 1 amappl15 192 15 0 14 1 0 1 1 0 8 0 amappl14 184 197 0 179 2 0 2 2 0 8 0 amappl13 176 11 0 11 1 1 0 1 0 8 0 amappl12 168 3099 0 3067 3 1 2 2 0 8 0 amappl11 160 57 0 43 1 0 1 1 0 8 0 amappl10 152 32 0 22 1 0 1 1 0 8 0 amappl9 144 204 0 202 1 0 1 1 0 8 0 amappl8 136 280 0 197 3 0 3 3 0 8 0 amappl7 128 86 0 71 2 0 2 2 0 8 0 amappl6 120 277 0 253 2 1 1 2 0 8 0 amappl5 112 227 0 215 1 0 1 1 0 8 0 amappl4 104 625 0 582 3 1 2 3 0 8 0 amappl3 96 14736 0 14647 4 1 3 3 0 8 0 amappl2 88 2712 0 2638 3 1 2 3 0 8 0 amappl1 80 17126 0 16567 23 9 14 23 0 8 0 amappl 88 22524 0 22290 6 0 6 6 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 2402 0 2373 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2402 0 2373 1 0 1 1 0 8 0 vmmpekpl 168 23210 0 23154 3 0 3 3 0 8 0 vmmpepl 168 162448 0 160048 162 51 111 128 0 357 0 vmsppl 464 2401 0 2373 5 1 4 5 0 8 0 rwobjpl 56 52080 0 45122 102 3 99 99 0 8 0 pdppl 4096 4812 0 4746 174 104 70 80 0 8 4 pvpl 32 894549 0 874928 394 222 172 355 0 265 3 pmappl 248 2401 0 2373 3 1 2 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1008 0 157 25 0 25 25 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 intr_handler(ffff80002127f720,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+0xf sys/dev/kcov.c:154 syscall(ffff80002127f900) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002127f900) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c87ae60c440, count: 6 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 intr_handler(ffff80002127f720,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+0xf sys/dev/kcov.c:154 syscall(ffff80002127f900) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002127f900) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c87ae60c440, 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(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(807d3fd8) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd8075f291b0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd8075f291b0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800027ba0568,fffffd8075f291b0,fffffd8075f29238,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800027ba0568,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800027ba0568) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800027ba0568,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800027ba0568,ffff800027b92fc0,ffff800027b93010) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800027b93090) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800027b93090) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74f16038a130, 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(807d3fd8) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd8075f291b0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd8075f291b0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800027ba0568,fffffd8075f291b0,fffffd8075f29238,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800027ba0568,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800027ba0568) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800027ba0568,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800027ba0568,ffff800027b92fc0,ffff800027b93010) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800027b93090) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800027b93090) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74f16038a130, count: -13