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 182293 10578 0 0 0 0 syz-executor4141521370 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279eeb4) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820513,ffffffff8283fa89,2bb,ffffffff827a57e4) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(ac5bab41) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f1fc288) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f1fc288) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff8000211feac0,fffffd806f1fc288,fffffd806f1fc310,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211feac0,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211feac0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211feac0,0,0,1) at exit1+0x3ff sys/kern/kern_exit.c:206 sys_exit(ffff8000211feac0,ffff8000212a5780,ffff8000212a57d0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000212a5850) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212a5850) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7624cd69c750, 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(ffffffff8279eeb4) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820513,ffffffff8283fa89,2bb,ffffffff827a57e4) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(ac5bab41) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f1fc288) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f1fc288) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff8000211feac0,fffffd806f1fc288,fffffd806f1fc310,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211feac0,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211feac0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211feac0,0,0,1) at exit1+0x3ff sys/kern/kern_exit.c:206 sys_exit(ffff8000211feac0,ffff8000212a5780,ffff8000212a57d0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000212a5850) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212a5850) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7624cd69c750, count: -13 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff8000212a53c0 rbx 0xffff800020d59b9f rdx 0x3fd rcx 0 rax 0x8f r8 0x101010101010101 r9 0x8080808080808080 r10 0xdf642cbbb25114f r11 0x852b9d67971f15b4 r12 0xffff800020d599a0 r13 0 r14 0 r15 0x1 rip 0xffffffff8266b7ec db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff8000212a53b0 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor4141521370) pid=422802 stat=onproc flags process=1008 proc=2000 pri=0, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff8000211fe818,0xffff8000211ff2c8 process=0xffff8000212af258 user=0xffff8000212a0000, vmspace=0xfffffd806cade3c0 estcpu=4, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 10578 182293 46909 0 7 0 syz-executor4141521370 75120 340984 88444 0 2 0 syz-executor4141521370 75120 308016 88444 0 3 0x4000080 fsleep syz-executor4141521370 86004 372770 21932 0 2 0 syz-executor4141521370 86004 519950 21932 0 2 0x4000000 syz-executor4141521370 15726 228794 76702 0 2 0 syz-executor4141521370 15726 471518 76702 0 3 0x4000080 fsleep syz-executor4141521370 46909 78774 95019 0 3 0x80 nanoslp syz-executor4141521370 67424 121750 95019 0 3 0 biowait syz-executor4141521370 88444 158371 95019 0 3 0x80 nanoslp syz-executor4141521370 15872 354509 95019 0 3 0x80 nanoslp syz-executor4141521370 97557 149034 95019 0 3 0 biowait syz-executor4141521370 21932 423990 95019 0 3 0x80 nanoslp syz-executor4141521370 54771 505354 95019 0 3 0x80 nanoslp syz-executor4141521370 76702 373865 95019 0 3 0x80 nanoslp syz-executor4141521370 95019 308537 5490 0 3 0x82 nanoslp syz-executor4141521370 5490 482790 261 0 3 0x10008a sigsusp ksh 261 200779 44034 0 3 0x9a kqread sshd 455 204963 1 0 3 0x100083 ttyin getty 44034 386393 1 0 3 0x88 kqread sshd 65747 143401 65387 73 3 0x1100090 kqread syslogd 65387 477295 1 0 3 0x100082 netio syslogd 89295 490000 1 0 3 0x100080 kqread resolvd 10374 7899 29961 77 3 0x100092 kqread dhcpleased 316 151530 29961 77 3 0x100092 kqread dhcpleased 29961 189633 1 0 3 0x80 kqread dhcpleased 18866 103882 0 0 3 0x14200 bored smr 88309 491647 0 0 2 0x14200 zerothread 12396 123195 0 0 3 0x14200 aiodoned aiodoned 91088 316165 0 0 3 0x14200 syncer update 24413 411271 0 0 3 0x14200 cleaner cleaner 3744 80186 0 0 2 0x14200 reaper 27565 361601 0 0 3 0x14200 pgdaemon pagedaemon 24879 262315 0 0 3 0x14200 bored viomb 15306 386643 0 0 3 0x40014200 acpi0 acpi0 63076 52336 0 0 3 0x40014200 idle1 33937 137807 0 0 3 0x14200 bored softnet3 60206 331706 0 0 3 0x14200 bored softnet2 28018 342342 0 0 3 0x14200 bored softnet1 84043 115739 0 0 3 0x14200 bored softnet0 68363 470768 0 0 3 0x14200 bored systqmp 36097 418934 0 0 3 0x14200 bored systq 62471 29573 0 0 3 0x40014200 bored softclock 38356 168104 0 0 3 0x40014200 idle0 1 370673 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 10578 (syz-executor4141521370) thread 0xffff8000211ffd58 (182293) shared rwlock vmmaplk r = 0 (0xfffffd806cade118) #0 witness_lock+0x447 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1772 #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 Process 67424 (syz-executor4141521370) thread 0xffff80002120dd50 (121750) exclusive rrwlock inode r = 0 (0xfffffd806d3a3c48) #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 (0xfffffd806d8445f8) #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 97557 (syz-executor4141521370) thread 0xffff8000211ee010 (149034) exclusive rrwlock inode r = 0 (0xfffffd806d3a3e68) #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 (0xfffffd806d8441b8) #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 10156 6389K 6420K 78643K 11234 0 pcb 13 8K 8K 78643K 13 0 rtable 58 1K 2K 78643K 110 0 pf 12 6K 6K 78643K 12 0 ifaddr 12 9K 9K 78643K 12 0 ifgroup 17 1K 1K 78643K 17 0 counters 44 33K 33K 78643K 44 0 ioctlops 0 0K 2K 78643K 21 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1174 73K 74K 78643K 1187 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 55 78K 79K 78643K 246 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 243 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 134 6K 7K 78643K 2770 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 3 0K 0K 78643K 3 0 temp 1 5904K 5968K 78643K 3007 0 kqueue 12 18K 24K 78643K 110 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 20 0 17 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 144 33 0 20 1 0 1 1 0 8 0 syncache 304 5 0 5 2 1 1 1 0 8 1 tcpqe 32 202 0 202 1 1 0 1 0 8 0 tcpcb 808 8 0 5 1 0 1 1 0 8 0 arp 120 2 0 0 1 0 1 1 0 8 0 inpcb 368 286 0 273 2 0 2 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 1520 0 119 88 0 88 88 0 8 0 ffsino 272 1520 0 119 94 0 94 94 0 8 0 nchpl 144 1792 0 221 59 0 59 59 0 8 0 uvmvnodes 80 1529 0 0 32 0 32 32 0 8 0 vnodes 216 1529 0 0 85 0 85 85 0 8 0 namei 1024 4624 0 4623 3 1 2 2 0 8 1 percpumem 16 35 0 0 1 0 1 1 0 8 0 kstatmem 264 6 0 0 1 0 1 1 0 8 0 scxspl 216 5678 0 5676 11 9 2 8 1 8 1 plimitpl 152 16 0 10 1 0 1 1 0 8 0 sigapl 424 406 0 362 6 0 6 6 0 8 0 futexpl 64 539 0 537 1 0 1 1 0 8 0 knotepl 120 48 0 0 2 0 2 2 0 8 0 kqueuepl 216 106 0 98 1 0 1 1 0 8 0 pipepl 320 87 0 84 2 1 1 1 0 8 0 fdescpl 496 389 0 363 5 1 4 4 0 8 0 filepl 152 1469 0 1409 3 0 3 3 0 8 0 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 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 104 66 0 56 1 0 1 1 0 8 0 zombiepl 144 364 0 362 2 1 1 1 0 8 0 processpl 1072 406 0 362 4 0 4 4 0 8 0 procpl 680 494 0 446 5 0 5 5 0 8 0 sockpl 488 339 0 310 5 0 5 5 0 8 1 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 248 0 0 31 0 31 31 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 257 0 0 17 1 16 17 0 8 0 bufpl 288 2606 0 84 181 0 181 181 0 8 0 anonpl 24 184301 0 182162 28 14 14 24 0 186 0 amapchunkpl 152 9750 0 9479 14 1 13 13 0 158 1 amappl16 200 5437 0 5427 6 5 1 5 0 8 0 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 104 0 95 1 0 1 1 0 8 0 amappl13 176 10 0 10 1 1 0 1 0 8 0 amappl12 168 885 0 861 2 0 2 2 0 8 0 amappl11 160 47 0 37 1 0 1 1 0 8 0 amappl10 152 14 0 14 2 1 1 1 0 8 1 amappl9 144 179 0 178 1 0 1 1 0 8 0 amappl8 136 31 0 29 1 0 1 1 0 8 0 amappl7 128 114 0 100 1 0 1 1 0 8 0 amappl6 120 141 0 128 1 0 1 1 0 8 0 amappl5 112 104 0 96 1 0 1 1 0 8 0 amappl4 104 412 0 383 1 0 1 1 0 8 0 amappl3 96 2649 0 2593 2 0 2 2 0 8 0 amappl2 88 557 0 509 3 1 2 2 0 8 0 amappl1 80 9386 0 8924 15 4 11 11 0 8 0 amappl 88 2501 0 2406 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 24 389 0 363 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 389 0 363 1 0 1 1 0 8 0 vmmpekpl 168 7158 0 7136 2 0 2 2 0 8 0 vmmpepl 168 37238 0 35972 68 8 60 60 0 357 3 vmsppl 464 388 0 363 5 1 4 4 0 8 0 rwobjpl 56 19623 0 17398 33 1 32 32 0 8 0 pdppl 4096 786 0 726 88 22 66 66 0 8 6 pvpl 32 284758 0 279698 64 21 43 52 0 265 1 pmappl 248 388 0 363 3 1 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 526 0 26 15 0 15 15 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82bffff0) 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(ffffffff82cd6528) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cd6528) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff8000212b5430,ffff80000067b200) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge25_untramp() at Xintr_ioapic_edge25_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x3a sys/dev/kcov.c:164 syscall(ffff8000212b5610) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212b5610) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7624cd69c7c0, count: 6 ddb{0}> trace x86_ipi_db(ffffffff82bffff0) 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(ffffffff82cd6528) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cd6528) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff8000212b5430,ffff80000067b200) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge25_untramp() at Xintr_ioapic_edge25_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x3a sys/dev/kcov.c:164 syscall(ffff8000212b5610) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212b5610) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7624cd69c7c0, 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(ffffffff8279eeb4) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820513,ffffffff8283fa89,2bb,ffffffff827a57e4) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(ac5bab41) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f1fc288) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f1fc288) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff8000211feac0,fffffd806f1fc288,fffffd806f1fc310,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211feac0,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211feac0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211feac0,0,0,1) at exit1+0x3ff sys/kern/kern_exit.c:206 sys_exit(ffff8000211feac0,ffff8000212a5780,ffff8000212a57d0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000212a5850) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212a5850) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7624cd69c750, count: 2 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279eeb4) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820513,ffffffff8283fa89,2bb,ffffffff827a57e4) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(ac5bab41) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f1fc288) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f1fc288) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff8000211feac0,fffffd806f1fc288,fffffd806f1fc310,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211feac0,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211feac0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211feac0,0,0,1) at exit1+0x3ff sys/kern/kern_exit.c:206 sys_exit(ffff8000211feac0,ffff8000212a5780,ffff8000212a57d0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000212a5850) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212a5850) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7624cd69c750, count: -13