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 308505 63549 0 0 0x4000000 0 syz-executor2123468665 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827a19e2) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281ff79,ffffffff827aa473,2bb,ffffffff827a1cb3) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(da70f2f5) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd8076862438) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd8076862438) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff8000212257e8,fffffd8076862438,fffffd80768624c0,0,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000212257e8,0) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000212257e8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000212257e8,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000212257e8,ffff800021287820,ffff800021287870) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000212878f0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212878f0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x721b865b6680, 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(ffffffff827a19e2) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281ff79,ffffffff827aa473,2bb,ffffffff827a1cb3) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(da70f2f5) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd8076862438) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd8076862438) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff8000212257e8,fffffd8076862438,fffffd80768624c0,0,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000212257e8,0) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000212257e8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000212257e8,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000212257e8,ffff800021287820,ffff800021287870) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000212878f0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212878f0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x721b865b6680, count: -13 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800021287460 rbx 0xffff800020d59b9f rdx 0x3fd rcx 0 rax 0x92 r8 0x101010101010101 r9 0x8080808080808080 r10 0x242de5f9933709ce r11 0x50c405d6752c91ec r12 0xffff800020d599a0 r13 0 r14 0 r15 0x1 rip 0xffffffff810eab1c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800021287450 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor2123468665) pid=491086 stat=onproc flags process=1008 proc=2000 pri=0, usrpri=55, nice=20 forw=0xffffffffffffffff, list=0xffff800021225d38,0xffff8000212252a8 process=0xffff8000ffff5508 user=0xffff800021282000, vmspace=0xfffffd8008a16570 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 61102 49642 593 0 2 0 syz-executor2123468665 61102 449609 593 0 2 0x4000080 syz-executor2123468665 63549 292676 3804 0 2 0 syz-executor2123468665 63549 308505 3804 0 7 0x4000000 syz-executor2123468665 4037 88971 47023 0 2 0 syz-executor2123468665 4037 240325 47023 0 3 0x4000080 fsleep syz-executor2123468665 1565 66372 5448 0 2 0 syz-executor2123468665 1565 518403 5448 0 3 0x4000080 fsleep syz-executor2123468665 1565 73134 5448 0 3 0x4000080 netcon syz-executor2123468665 57934 41956 0 0 3 0x14200 bored sosplice 593 95872 2212 0 3 0x80 nanoslp syz-executor2123468665 3804 273024 2212 0 3 0x80 nanoslp syz-executor2123468665 85683 339589 2212 0 3 0 biowait syz-executor2123468665 39514 19833 2212 0 3 0 biowait syz-executor2123468665 65662 448035 2212 0 3 0x80 nanoslp syz-executor2123468665 47023 506189 2212 0 3 0x80 nanoslp syz-executor2123468665 5448 149799 2212 0 3 0x80 nanoslp syz-executor2123468665 10350 388645 2212 0 3 0x80 nanoslp syz-executor2123468665 2212 90097 40630 0 3 0x82 nanoslp syz-executor2123468665 40630 132571 41593 0 3 0x10008a sigsusp ksh 41593 446553 10792 0 3 0x9a kqread sshd 9698 125153 1 0 3 0x100083 ttyin getty 10792 315312 1 0 3 0x88 kqread sshd 86117 283987 15220 74 3 0x1100092 bpf pflogd 15220 281181 1 0 3 0x80 netio pflogd 76009 183712 30753 73 3 0x1100090 kqread syslogd 30753 107952 1 0 3 0x100082 netio syslogd 71315 425538 1 0 3 0x100080 kqread resolvd 31137 333223 93001 77 3 0x100092 kqread dhcpleased 93742 26278 93001 77 3 0x100092 kqread dhcpleased 93001 211363 1 0 3 0x80 kqread dhcpleased 94147 289955 0 0 3 0x14200 bored smr 85046 222993 0 0 2 0x14200 zerothread 11840 124784 0 0 3 0x14200 aiodoned aiodoned 64157 58574 0 0 3 0x14200 syncer update 62200 97333 0 0 3 0x14200 cleaner cleaner 74166 410904 0 0 2 0x14200 reaper 65123 332908 0 0 3 0x14200 pgdaemon pagedaemon 48045 294491 0 0 3 0x14200 bored viomb 45525 48209 0 0 3 0x40014200 acpi0 acpi0 43291 95125 0 0 3 0x40014200 idle1 28541 358936 0 0 3 0x14200 bored softnet3 17815 225477 0 0 3 0x14200 bored softnet2 76191 183813 0 0 3 0x14200 bored softnet1 105 484956 0 0 3 0x14200 bored softnet0 89273 366165 0 0 3 0x14200 bored systqmp 41660 3350 0 0 3 0x14200 bored systq 99020 127031 0 0 3 0x40014200 bored softclock 73223 235941 0 0 3 0x40014200 idle0 1 200251 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 (0xffffffff82cfb918) #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 85683 (syz-executor2123468665) thread 0xffff8000211f5808 (339589) exclusive rrwlock inode r = 0 (0xfffffd806cc334e0) #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 (0xfffffd806cd7b918) #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 Process 39514 (syz-executor2123468665) thread 0xffff8000211f5ab0 (19833) exclusive rrwlock inode r = 0 (0xfffffd806cc330a0) #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 vget+0x200 sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1314 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6e2 sys/kern/vfs_lookup.c:566 #11 namei+0x55a sys/kern/vfs_lookup.c:250 #12 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847 #13 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #13 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806cd7bb38) #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 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847 #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 10163 6456K 6456K 78643K 11241 0 pcb 13 10K 12K 78643K 15 0 rtable 58 1K 2K 78643K 116 0 pf 15 6K 10K 78643K 26 0 ifaddr 13 9K 9K 78643K 13 0 ifgroup 22 1K 1K 78643K 22 0 counters 44 33K 33K 78643K 44 0 ioctlops 0 0K 4K 78643K 1475 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1176 74K 74K 78643K 1192 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 1 0K 0K 78643K 1 0 proc 67 91K 91K 78643K 302 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 25 122K 122K 78643K 25 0 exec 0 0K 1K 78643K 272 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 155 7K 8K 78643K 3311 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 4 0K 0K 78643K 4 0 temp 1 5904K 5968K 78643K 3335 0 kqueue 12 18K 22K 78643K 145 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 21 0 18 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 144 35 0 20 1 0 1 1 0 8 0 syncache 304 126 0 126 1 0 1 1 0 8 1 tcpqe 32 323 0 323 1 0 1 1 0 8 1 tcpcb 808 495 0 356 15 0 15 15 0 8 0 arp 120 2 0 0 1 0 1 1 0 8 0 inpcb 368 644 0 500 14 0 14 14 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 9 0 0 1 0 1 1 0 8 0 pfstkey 128 9 0 0 1 0 1 1 0 8 0 pfstate 376 9 0 0 1 0 1 1 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 97 0 0 7 0 7 7 0 8 0 art_table 32 98 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1565 0 155 89 0 89 89 0 8 0 ffsino 272 1565 0 155 95 0 95 95 0 8 0 nchpl 144 1875 0 293 59 0 59 59 0 8 0 uvmvnodes 80 1579 0 0 33 0 33 33 0 8 0 vnodes 216 1579 0 0 88 0 88 88 0 8 0 namei 1024 5084 0 5083 2 0 2 2 0 8 1 percpumem 16 35 0 0 1 0 1 1 0 8 0 kstatmem 264 8 0 0 1 0 1 1 0 8 0 scxspl 216 5758 0 5756 3 1 2 2 1 8 1 plimitpl 152 17 0 10 1 0 1 1 0 8 0 sigapl 424 473 0 426 7 1 6 6 0 8 0 futexpl 64 1608 0 1606 1 0 1 1 0 8 0 knotepl 120 47 0 0 2 0 2 2 0 8 0 kqueuepl 216 141 0 133 1 0 1 1 0 8 0 pipepl 320 95 0 92 1 0 1 1 0 8 0 fdescpl 496 455 0 427 4 0 4 4 0 8 0 filepl 152 2011 0 1939 4 0 4 4 0 8 1 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 18 0 9 1 0 1 1 0 8 0 pgrppl 48 18 0 9 1 0 1 1 0 8 0 ucredpl 104 71 0 59 1 0 1 1 0 8 0 zombiepl 144 428 0 426 1 0 1 1 0 8 0 processpl 1072 473 0 426 4 0 4 4 0 8 0 procpl 680 598 0 545 6 1 5 5 0 8 0 sosppl 168 120 0 114 1 0 1 1 0 8 0 sockpl 488 700 0 537 21 0 21 21 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 267 0 0 34 0 34 34 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 280 0 0 18 0 18 18 0 8 0 bufpl 288 2703 0 90 187 0 187 187 0 8 0 anonpl 24 188194 0 185814 25 2 23 25 0 186 8 amapchunkpl 152 11242 0 10924 14 0 14 14 0 158 0 amappl16 200 5265 0 5254 5 2 3 5 0 8 2 amappl15 192 28 0 28 1 1 0 1 0 8 0 amappl14 184 115 0 104 1 0 1 1 0 8 0 amappl13 176 11 0 11 1 1 0 1 0 8 0 amappl12 168 1003 0 976 3 1 2 2 0 8 0 amappl11 160 66 0 52 1 0 1 1 0 8 0 amappl10 152 18 0 18 1 0 1 1 0 8 1 amappl9 144 161 0 161 1 0 1 1 0 8 1 amappl8 136 31 0 29 1 0 1 1 0 8 0 amappl7 128 151 0 136 1 0 1 1 0 8 0 amappl6 120 159 0 143 1 0 1 1 0 8 0 amappl5 112 118 0 107 1 0 1 1 0 8 0 amappl4 104 473 0 438 2 0 2 2 0 8 1 amappl3 96 2933 0 2866 3 1 2 2 0 8 0 amappl2 88 635 0 580 2 0 2 2 0 8 0 amappl1 80 9968 0 9451 12 0 12 12 0 8 0 amappl 88 3000 0 2891 3 0 3 3 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 455 0 427 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 455 0 427 1 0 1 1 0 8 0 vmmpekpl 168 7784 0 7762 2 0 2 2 0 8 0 vmmpepl 168 40943 0 39518 68 1 67 67 0 357 4 vmsppl 464 454 0 427 4 0 4 4 0 8 0 rwobjpl 56 20407 0 18033 35 1 34 34 0 8 0 pdppl 4096 918 0 854 84 14 70 70 0 8 6 pvpl 32 301232 0 295503 57 2 55 57 0 265 7 pmappl 248 454 0 427 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 560 0 17 16 0 16 16 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82be4ff0) 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(ffffffff82c82a60) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c82a60) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff8000212c38e0,ffff80000006bc00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xsyscall() at Xsyscall+0x111 end of kernel end trace frame: 0xa68f1ffd20, count: 8 ddb{0}> trace x86_ipi_db(ffffffff82be4ff0) 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(ffffffff82c82a60) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c82a60) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff8000212c38e0,ffff80000006bc00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xsyscall() at Xsyscall+0x111 end of kernel end trace frame: 0xa68f1ffd20, count: -7 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(ffffffff827a19e2) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281ff79,ffffffff827aa473,2bb,ffffffff827a1cb3) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(da70f2f5) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd8076862438) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd8076862438) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff8000212257e8,fffffd8076862438,fffffd80768624c0,0,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000212257e8,0) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000212257e8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000212257e8,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000212257e8,ffff800021287820,ffff800021287870) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000212878f0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212878f0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x721b865b6680, count: 2 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827a19e2) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281ff79,ffffffff827aa473,2bb,ffffffff827a1cb3) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(da70f2f5) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd8076862438) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd8076862438) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff8000212257e8,fffffd8076862438,fffffd80768624c0,0,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000212257e8,0) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000212257e8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000212257e8,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000212257e8,ffff800021287820,ffff800021287870) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000212878f0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212878f0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x721b865b6680, count: -13 ddb{1}>