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 436547 59493 0 0x1000 0x2000 0K syz-executor.4 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279cee4) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281f4c1,ffffffff827a89ae,2bb,ffffffff827a0301) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(81c9f00e) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806ef565e8) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806ef565e8) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff80002124b2a0,fffffd806ef565e8,fffffd806ef56670,0,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002124b2a0,0) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002124b2a0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002124b2a0,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002124b2a0,ffff8000246ef4e0,ffff8000246ef530) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000246ef5b0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000246ef5b0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74736276d650, 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(ffffffff8279cee4) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281f4c1,ffffffff827a89ae,2bb,ffffffff827a0301) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(81c9f00e) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806ef565e8) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806ef565e8) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff80002124b2a0,fffffd806ef565e8,fffffd806ef56670,0,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002124b2a0,0) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002124b2a0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002124b2a0,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002124b2a0,ffff8000246ef4e0,ffff8000246ef530) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000246ef5b0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000246ef5b0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74736276d650, count: -13 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff8000246ef120 rbx 0xffff800020d59b9f rdx 0 rcx 0xffff80002124b2a0 rax 0xffff800020d58ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x1a88830deefa9c29 r11 0x74340988baf04308 r12 0xffff800020d599a0 r13 0 r14 0 r15 0x1 rip 0xffffffff82407bcc db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff8000246ef110 ss 0 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.3) pid=298229 stat=onproc flags process=1008 proc=2000 pri=0, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff80002124b7f0,0xffff800021224d58 process=0xffff800021292198 user=0xffff8000246ea000, vmspace=0xfffffd8069eb4af8 estcpu=36, cpticks=3, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 59493 436547 24120 0 7 0x3000 syz-executor.4 59493 466467 24120 0 2 0x4081080 syz-executor.4 29524 191088 37592 0 2 0 syz-executor.2 29524 258435 37592 0 3 0x4000080 fsleep syz-executor.2 28293 5025 86096 0 2 0 syz-executor.7 28293 381331 86096 0 3 0x4000080 fsleep syz-executor.7 24120 216759 95955 0 2 0x482 syz-executor.4 37592 69497 95955 0 2 0x482 syz-executor.2 85180 46869 0 0 3 0x14200 bored sosplice 44069 320967 1 0 3 0x100083 ttyin getty 86096 325811 95955 0 2 0x482 syz-executor.7 71166 369153 95955 0 3 0x82 piperd syz-executor.5 61735 42715 95955 0 2 0x482 syz-executor.3 50484 97746 95955 0 2 0x2 syz-executor.6 74744 75082 95955 0 2 0x482 syz-executor.1 3953 345869 95955 0 2 0x482 syz-executor.0 95955 57845 99206 0 3 0x2000082 wait syz-fuzzer 95955 159579 99206 0 3 0x6000082 thrsleep syz-fuzzer 95955 108634 99206 0 3 0x6000082 thrsleep syz-fuzzer 95955 282712 99206 0 3 0x6000082 thrsleep syz-fuzzer 95955 122410 99206 0 3 0x6000082 wait syz-fuzzer 95955 134639 99206 0 3 0x6000082 kqread syz-fuzzer 95955 63894 99206 0 3 0x6000082 wait syz-fuzzer 95955 224935 99206 0 3 0x6000082 wait syz-fuzzer 95955 173971 99206 0 3 0x6000082 wait syz-fuzzer 95955 49121 99206 0 3 0x6000082 thrsleep syz-fuzzer 95955 281969 99206 0 3 0x6000082 thrsleep syz-fuzzer 95955 376043 99206 0 3 0x6000082 wait syz-fuzzer 95955 385060 99206 0 3 0x6000082 thrsleep syz-fuzzer 95955 180029 99206 0 3 0x6000082 thrsleep syz-fuzzer 95955 415842 99206 0 3 0x6000082 wait syz-fuzzer 95955 169217 99206 0 3 0x6000082 wait syz-fuzzer 99206 245199 87294 0 3 0x10008a sigsusp ksh 87294 209077 23001 0 3 0x9a kqread sshd 23001 309966 1 0 3 0x88 kqread sshd 72306 197559 85301 74 3 0x1100092 bpf pflogd 85301 335616 1 0 3 0x80 netio pflogd 87971 407730 61523 73 3 0x1100090 kqread syslogd 61523 354972 1 0 3 0x100082 netio syslogd 12236 142862 1 0 3 0x100080 kqread resolvd 97909 242797 9559 77 3 0x100092 kqread dhcpleased 68411 235018 9559 77 3 0x100092 kqread dhcpleased 9559 64664 1 0 3 0x80 kqread dhcpleased 33752 220117 0 0 3 0x14200 bored smr 46550 4161 0 0 2 0x14200 zerothread 9717 177721 0 0 3 0x14200 aiodoned aiodoned 7562 308764 0 0 3 0x14200 syncer update 70455 517407 0 0 3 0x14200 cleaner cleaner 38780 502478 0 0 2 0x14200 reaper 85975 323436 0 0 3 0x14200 pgdaemon pagedaemon 74848 477512 0 0 3 0x14200 bored viomb 76645 308357 0 0 3 0x40014200 acpi0 acpi0 86194 95112 0 0 3 0x40014200 idle1 45291 57933 0 0 3 0x14200 bored softnet3 91348 180299 0 0 3 0x14200 bored softnet2 84836 446624 0 0 3 0x14200 bored softnet1 59722 248822 0 0 3 0x14200 bored softnet0 98470 147111 0 0 3 0x14200 bored systqmp 53884 81219 0 0 3 0x14200 bored systq 74354 141445 0 0 2 0x40014200 softclock 95415 151245 0 0 3 0x40014200 idle0 1 64775 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive sched_lock &sched_lock r = 0 (0xffffffff82cfced8) #0 witness_lock+0x447 #1 wakeup_n+0x37 sys/kern/kern_synch.c:541 #2 sched_idle+0x232 sys/kern/kern_sched.c:176 #3 proc_trampoline+0x1c Process 50484 (syz-executor.6) thread 0xffff800021224550 (97746) exclusive rrwlock inode r = 0 (0xfffffd806959b5f8) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 ufs_ihashins+0x46 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1343 #6 ffs_inode_alloc+0x1c2 sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf8 sys/ufs/ufs/ufs_vnops.c:1149 #8 VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388 #9 domkdirat+0x125 sys/kern/vfs_syscalls.c:3073 #10 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #10 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b6720a8) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd5 sys/kern/vfs_lookup.c:418 #6 namei+0x55a sys/kern/vfs_lookup.c:250 #7 domkdirat+0x79 sys/kern/vfs_syscalls.c:3058 #8 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #8 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10209 6544K 8357K 78643K 14334 0 pcb 13 10K 12K 78643K 103 0 rtable 239 7K 7K 78643K 544 0 pf 32 9K 10K 78643K 70 0 ifaddr 45 15K 15K 78643K 71 0 ifgroup 55 2K 2K 78643K 100 0 sysctl 3 1K 1K 78643K 3 0 counters 60 35K 36K 78643K 86 0 ioctlops 0 0K 4K 78643K 1496 0 iov 0 0K 16K 78643K 98 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1292 81K 81K 78643K 2318 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 21K 78643K 77 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 55 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 14 49K 81K 78643K 3026 0 sigio 0 0K 0K 78643K 18 0 proc 69 91K 115K 78643K 661 0 subproc 104 6K 6K 78643K 143 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 158 0 in_multi 99 7K 7K 78643K 212 0 ether_multi 1 0K 0K 78643K 1 0 mrt 0 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 121 546K 546K 78643K 121 0 exec 0 0K 1K 78643K 531 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 289 78K 81K 78643K 28348 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 119 0 NDP 12 0K 2K 78643K 47 0 temp 73 5916K 5992K 78643K 27906 0 kqueue 12 18K 27K 78643K 332 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 120 105 0 102 1 0 1 1 0 8 0 rtentry 112 164 0 53 4 0 4 4 0 8 0 unpcb 144 808 0 793 3 2 1 2 0 8 0 syncache 304 83 0 83 3 2 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 160 0 160 4 3 1 1 0 8 1 tcpcb 808 576 0 451 14 1 13 13 0 8 0 arp 120 24 0 6 1 0 1 1 0 8 0 inpcb 368 1164 0 1032 12 0 12 12 0 8 0 nd6 136 36 0 11 1 0 1 1 0 8 0 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1256 4 0 4 1 1 0 1 0 8 0 pffrag 232 4 0 4 2 2 0 1 0 482 0 pffrnode 88 4 0 4 2 2 0 1 0 8 0 pffrent 40 12 0 12 1 1 0 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 63 0 33 1 0 1 1 0 8 0 pfstkey 128 63 0 33 2 0 2 2 0 8 0 pfstate 376 63 0 33 6 2 4 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 256 608 0 150 30 1 29 30 0 8 0 art_table 32 609 0 150 4 0 4 4 0 8 0 art_node 16 146 0 45 1 0 1 1 0 8 0 sysvmsgpl 40 54 0 36 1 0 1 1 0 8 0 semapl 112 53 0 43 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 5229 0 3766 92 0 92 92 0 8 0 ffsino 272 5229 0 3766 99 0 99 99 0 8 0 nchpl 144 9034 0 7384 64 0 64 64 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 23955 0 23954 2 1 1 2 0 8 0 percpumem 16 56 0 13 1 0 1 1 0 8 0 vmpool 696 10 0 10 1 1 0 1 0 8 0 kstatmem 264 50 0 26 2 0 2 2 0 8 0 scxspl 216 26827 0 26827 12 11 1 8 1 8 1 plimitpl 152 131 0 115 1 0 1 1 0 8 0 sigapl 424 3342 0 3295 7 1 6 6 0 8 0 futexpl 64 20519 0 20516 1 0 1 1 0 8 0 knotepl 120 113 0 0 4 0 4 4 0 8 0 kqueuepl 216 386 0 378 1 0 1 1 0 8 0 pipepl 320 281 0 252 4 1 3 4 0 8 0 fdescpl 496 3324 0 3297 6 1 5 5 0 8 1 filepl 152 10280 0 10031 12 2 10 11 0 8 0 lockfpl 104 940 0 938 1 0 1 1 0 8 0 lockfspl 48 449 0 447 1 0 1 1 0 8 0 sessionpl 144 28 0 11 1 0 1 1 0 8 0 pgrppl 48 64 0 47 1 0 1 1 0 8 0 ucredpl 104 1667 0 1655 1 0 1 1 0 8 0 zombiepl 144 3298 0 3295 1 0 1 1 0 8 0 processpl 1072 3342 0 3295 4 0 4 4 0 8 0 procpl 680 6691 0 6625 10 3 7 8 0 8 1 sosppl 168 37 0 35 2 1 1 1 0 8 0 sockpl 488 2091 0 1941 21 2 19 19 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 10 0 0 1 0 1 1 0 8 0 mcl9k 9216 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 10 0 0 1 0 1 1 0 8 0 mcl2k 2048 274 0 0 35 1 34 35 0 8 0 mtagpl 96 343 0 0 9 0 9 9 0 8 0 mbufpl 256 795 0 0 49 1 48 48 0 8 0 bufpl 288 7697 0 1367 453 0 453 453 0 8 0 anonpl 24 391277 0 384803 61 19 42 57 0 186 0 amapchunkpl 152 90646 0 89983 46 9 37 37 0 158 7 amappl16 200 8210 0 8082 9 0 9 9 0 8 1 amappl15 192 39 0 39 1 1 0 1 0 8 0 amappl14 184 174 0 161 2 1 1 2 0 8 0 amappl13 176 14 0 14 2 2 0 1 0 8 0 amappl12 168 4054 0 4023 3 1 2 2 0 8 0 amappl11 160 56 0 42 1 0 1 1 0 8 0 amappl10 152 33 0 24 1 0 1 1 0 8 0 amappl9 144 196 0 195 1 0 1 1 0 8 0 amappl8 136 238 0 171 3 0 3 3 0 8 0 amappl7 128 84 0 67 2 0 2 2 0 8 0 amappl6 120 251 0 231 2 1 1 2 0 8 0 amappl5 112 195 0 181 1 0 1 1 0 8 0 amappl4 104 644 0 597 5 3 2 4 0 8 0 amappl3 96 18383 0 18310 4 1 3 3 0 8 0 amappl2 88 3592 0 3524 3 1 2 3 0 8 0 amappl1 80 19816 0 19260 23 10 13 23 0 8 0 amappl 88 27733 0 27547 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 3334 0 3307 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3334 0 3307 1 0 1 1 0 8 0 vmmpekpl 168 21874 0 21806 4 0 4 4 0 8 0 vmmpepl 168 201896 0 199963 130 26 104 118 0 357 10 vmsppl 464 3333 0 3307 5 0 5 5 0 8 0 rwobjpl 56 55863 0 48613 104 0 104 104 0 8 1 pdppl 4096 6676 0 6614 152 82 70 78 0 8 8 pvpl 32 1223069 0 1210961 367 98 269 366 0 265 162 pmappl 248 3333 0 3307 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 963 0 94 25 0 25 25 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82b79ff0) 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+0x10 sys/dev/kcov.c:154 msleep(ffff800021291230,ffff8000212911d8,20,ffffffff82822482,0) at msleep+0x136 sys/kern/kern_synch.c:232 single_thread_set(ffff800021224d48,2,1) at single_thread_set+0x37e single_thread_wait sys/kern/kern_sig.c:2180 [inline] single_thread_set(ffff800021224d48,2,1) at single_thread_set+0x37e sys/kern/kern_sig.c:2157 exit1(ffff800021224d48,0,0,1) at exit1+0xaa sys_exit(ffff800021224d48,ffff8000246f54f0,ffff8000246f5540) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000246f55c0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000246f55c0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ad210ed71c0, count: 5 ddb{0}> trace x86_ipi_db(ffffffff82b79ff0) 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+0x10 sys/dev/kcov.c:154 msleep(ffff800021291230,ffff8000212911d8,20,ffffffff82822482,0) at msleep+0x136 sys/kern/kern_synch.c:232 single_thread_set(ffff800021224d48,2,1) at single_thread_set+0x37e single_thread_wait sys/kern/kern_sig.c:2180 [inline] single_thread_set(ffff800021224d48,2,1) at single_thread_set+0x37e sys/kern/kern_sig.c:2157 exit1(ffff800021224d48,0,0,1) at exit1+0xaa sys_exit(ffff800021224d48,ffff8000246f54f0,ffff8000246f5540) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000246f55c0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000246f55c0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ad210ed71c0, count: -10 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(ffffffff8279cee4) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281f4c1,ffffffff827a89ae,2bb,ffffffff827a0301) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(81c9f00e) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806ef565e8) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806ef565e8) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff80002124b2a0,fffffd806ef565e8,fffffd806ef56670,0,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002124b2a0,0) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002124b2a0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002124b2a0,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002124b2a0,ffff8000246ef4e0,ffff8000246ef530) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000246ef5b0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000246ef5b0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74736276d650, count: 2 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279cee4) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281f4c1,ffffffff827a89ae,2bb,ffffffff827a0301) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(81c9f00e) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806ef565e8) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806ef565e8) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff80002124b2a0,fffffd806ef565e8,fffffd806ef56670,0,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002124b2a0,0) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002124b2a0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002124b2a0,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002124b2a0,ffff8000246ef4e0,ffff8000246ef530) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000246ef5b0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000246ef5b0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74736276d650, count: -13