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 256706 6896 32767 0x10 0 0 syz-executor.0 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279d30b) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281e44b,ffffffff8283c848,2bb,ffffffff827a2681) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(a5ebc949) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f194000) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f194000) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800021281548,fffffd806f194000,fffffd806f194088,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021281548,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021281548) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021281548,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021281548,ffff80002fe3ddb0,ffff80002fe3de00) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002fe3de80) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002fe3de80) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b0ad254cb50, 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(ffffffff8279d30b) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281e44b,ffffffff8283c848,2bb,ffffffff827a2681) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(a5ebc949) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f194000) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f194000) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800021281548,fffffd806f194000,fffffd806f194088,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021281548,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021281548) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021281548,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021281548,ffff80002fe3ddb0,ffff80002fe3de00) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002fe3de80) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002fe3de80) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b0ad254cb50, count: -13 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002fe3d9f0 rbx 0xffff800020d59b9f rdx 0 rcx 0xffff800021281548 rax 0xffff800020d58ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x9b8fc0f2cb8654cd r11 0x61a8acfbe2e40937 r12 0xffff800020d599a0 r13 0 r14 0 r15 0x1 rip 0xffffffff82173d1c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002fe3d9e0 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.5) pid=206501 stat=onproc flags process=1018 proc=2000 pri=0, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800021280008,0xffff8000222edd48 process=0xffff8000ffff4448 user=0xffff80002fe38000, vmspace=0xfffffd806f1383a8 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 79995 245560 47307 32767 3 0x90 nanoslp syz-executor.4 79995 246138 47307 32767 3 0x4000090 fsleep syz-executor.4 6896 256706 35308 32767 7 0x10 syz-executor.0 6896 181957 35308 32767 2 0x4000010 syz-executor.0 29438 88674 88958 32767 2 0x10 syz-executor.6 29438 274454 88958 32767 3 0x4000090 fsleep syz-executor.6 29438 477415 88958 32767 3 0x4000090 fsleep syz-executor.6 39445 371654 44644 32767 3 0x90 nanoslp syz-executor.7 39445 506517 44644 32767 3 0x4000090 kqpoll syz-executor.7 39445 452441 44644 32767 3 0x4000090 fsleep syz-executor.7 96820 344595 26094 32767 3 0x90 nanoslp syz-executor.5 26094 491722 56198 0 3 0x82 wait syz-executor.5 47307 471061 72012 32767 3 0x90 nanoslp syz-executor.4 72012 21248 56198 0 3 0x82 wait syz-executor.4 44644 133940 71725 32767 3 0x90 nanoslp syz-executor.7 71725 151299 56198 0 3 0x82 wait syz-executor.7 65820 398774 12869 32767 3 0x10 biowait syz-executor.3 12869 7177 56198 0 3 0x82 wait syz-executor.3 35308 32908 3770 32767 3 0x90 nanoslp syz-executor.0 3770 509578 56198 0 3 0x82 wait syz-executor.0 35491 164432 0 0 3 0x14200 bored sosplice 51112 78784 38401 32767 3 0x90 nanoslp syz-executor.2 40721 148037 86583 0 3 0x100082 netio arp 86583 173560 36954 0 3 0x10008a sigsusp sh 88958 396855 93613 32767 3 0x90 nanoslp syz-executor.6 93613 380309 56198 0 3 0x82 wait syz-executor.6 38401 447959 56198 0 3 0x82 wait syz-executor.2 96186 168467 55496 32767 3 0x10 biowait syz-executor.1 36954 58099 1 0 3 0x80 wait syz-executor.4 55496 154788 56198 0 3 0x82 wait syz-executor.1 56198 412921 34349 0 3 0x2000082 wait syz-fuzzer 56198 184109 34349 0 3 0x6000082 thrsleep syz-fuzzer 56198 286298 34349 0 3 0x6000082 wait syz-fuzzer 56198 445509 34349 0 3 0x6000082 thrsleep syz-fuzzer 56198 328958 34349 0 3 0x6000082 wait syz-fuzzer 56198 354497 34349 0 3 0x6000082 thrsleep syz-fuzzer 56198 481309 34349 0 3 0x6000082 wait syz-fuzzer 56198 41389 34349 0 3 0x6000082 kqread syz-fuzzer 56198 6660 34349 0 3 0x6000082 thrsleep syz-fuzzer 56198 264371 34349 0 3 0x6000082 thrsleep syz-fuzzer 56198 37975 34349 0 3 0x6000082 wait syz-fuzzer 56198 505325 34349 0 3 0x6000082 wait syz-fuzzer 56198 338947 34349 0 3 0x6000082 wait syz-fuzzer 56198 123706 34349 0 3 0x6000082 thrsleep syz-fuzzer 56198 23598 34349 0 3 0x6000082 wait syz-fuzzer 34349 392556 56304 0 3 0x10008a sigsusp ksh 56304 202633 61135 0 3 0x9a kqread sshd 76183 81910 1 0 3 0x100083 ttyin getty 61135 82530 1 0 3 0x88 kqread sshd 2468 373587 15120 73 3 0x1100090 kqread syslogd 15120 277514 1 0 3 0x100082 netio syslogd 27986 76507 1 0 3 0x100080 kqread resolvd 43829 365485 56542 77 3 0x100092 kqread dhcpleased 97761 269758 56542 77 3 0x100092 kqread dhcpleased 56542 471607 1 0 3 0x80 kqread dhcpleased 13138 392977 0 0 3 0x14200 bored smr 74461 250010 0 0 2 0x14200 zerothread 59653 116733 0 0 3 0x14200 aiodoned aiodoned 36213 134216 0 0 3 0x14200 syncer update 75967 230226 0 0 3 0x14200 cleaner cleaner 85343 120715 0 0 2 0x14200 reaper 35669 432759 0 0 3 0x14200 pgdaemon pagedaemon 10237 511033 0 0 3 0x14200 bored viomb 63998 317511 0 0 3 0x40014200 acpi0 acpi0 215 93617 0 0 3 0x40014200 idle1 46390 495821 0 0 3 0x14200 bored softnet3 93844 320842 0 0 3 0x14200 bored softnet2 4761 208350 0 0 3 0x14200 bored softnet1 74171 402598 0 0 3 0x14200 bored softnet0 4557 47330 0 0 3 0x14200 bored systqmp 10313 5915 0 0 3 0x14200 bored systq 10457 48079 0 0 3 0x40014200 bored softclock 22083 419886 0 0 3 0x40014200 idle0 1 279993 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 65820 (syz-executor.3) thread 0xffff8000222ecd48 (398774) exclusive rrwlock inode r = 0 (0xfffffd806e387c50) #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 (0xfffffd807e7e14d8) #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 96186 (syz-executor.1) thread 0xffff80002121b008 (168467) exclusive rrwlock inode r = 0 (0xfffffd806bc07818) #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 (0xfffffd80793eb0a0) #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 10218 6413K 6420K 78643K 11328 0 pcb 13 10K 12K 78643K 15 0 rtable 240 6K 7K 78643K 769 0 pf 29 8K 8K 78643K 49 0 ifaddr 44 15K 15K 78643K 86 0 ifgroup 50 2K 2K 78643K 90 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 35K 78643K 80 0 ioctlops 0 0K 2K 78643K 57 0 iov 0 0K 24K 78643K 407 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1292 81K 81K 78643K 5788 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 82 0 VM map 2 1K 1K 78643K 2 0 sem 11 1K 1K 78643K 16 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 26 97K 125K 78643K 6819 0 sigio 0 0K 0K 78643K 128 0 proc 56 78K 103K 78643K 1040 0 subproc 117 7K 7K 78643K 234 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 554 0 in_multi 99 7K 7K 78643K 308 0 ether_multi 1 0K 0K 78643K 18 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 247 1102K 1102K 78643K 247 0 exec 0 0K 1K 78643K 1105 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 440 99K 113K 78643K 68560 0 UVM aobj 131 4K 4K 78643K 137 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 121 0 NDP 11 0K 1K 78643K 55 0 temp 78 5920K 5996K 78643K 19778 0 kqueue 12 18K 26K 78643K 592 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 120 309 0 305 5 4 1 3 0 8 0 rtentry 112 219 0 106 4 0 4 4 0 8 0 unpcb 144 5933 0 5920 67 61 6 10 0 8 5 syncache 304 69 0 69 15 14 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 246 0 246 10 9 1 1 0 8 1 tcpcb 808 2853 0 2839 82 78 4 14 0 8 2 arp 120 37 0 19 1 0 1 1 0 8 0 ipq 40 83 0 82 6 5 1 1 0 8 0 ipqe 40 358 0 357 6 5 1 1 0 8 0 inpcb 368 4679 0 4662 108 103 5 13 0 8 3 nd6 136 57 0 30 1 0 1 1 0 8 0 kcovpl 48 18 0 9 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 880 0 408 30 0 30 30 0 8 0 art_table 32 881 0 408 4 0 4 4 0 8 0 art_node 16 218 0 115 1 0 1 1 0 8 0 sysvmsgpl 40 48 0 8 2 1 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 9 0 0 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 13330 0 11883 91 0 91 91 0 8 0 ffsino 272 13330 0 11883 97 0 97 97 0 8 0 nchpl 144 22132 0 20490 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 78603 0 78602 4 3 1 2 0 8 0 percpumem 16 53 0 10 1 0 1 1 0 8 0 kstatmem 264 42 0 20 2 0 2 2 0 8 0 scxspl 216 58333 0 58331 26 25 1 8 1 8 0 plimitpl 152 810 0 786 18 16 2 2 0 8 1 sigapl 424 7097 0 7041 7 0 7 7 0 8 0 futexpl 64 56888 0 56884 4 3 1 1 0 8 0 knotepl 120 689 0 0 15 1 14 15 0 8 0 kqueuepl 216 1767 0 1758 37 32 5 8 0 8 4 pipepl 320 1844 0 1813 59 56 3 9 0 8 0 fdescpl 496 7079 0 7042 9 3 6 6 0 8 0 filepl 152 55332 0 55077 133 117 16 23 0 8 4 lockfpl 104 998 0 996 2 1 1 2 0 8 0 lockfspl 48 240 0 238 1 0 1 1 0 8 0 sessionpl 144 33 0 16 1 0 1 1 0 8 0 pgrppl 48 107 0 90 1 0 1 1 0 8 0 ucredpl 104 19602 0 19584 1 0 1 1 0 8 0 zombiepl 144 7043 0 7041 2 1 1 1 0 8 0 processpl 1072 7097 0 7041 5 1 4 5 0 8 0 procpl 680 18928 0 18851 27 19 8 8 0 8 1 sosppl 168 68 0 68 12 12 0 1 0 8 0 sockpl 488 11023 0 10989 302 290 12 34 0 8 7 mcl64k 65536 25 0 0 3 0 3 3 0 8 0 mcl16k 16384 23 0 0 3 1 2 3 0 8 0 mcl12k 12288 23 0 0 2 0 2 2 0 8 0 mcl9k 9216 14 0 0 1 0 1 1 0 8 0 mcl8k 8192 42 0 0 4 1 3 3 0 8 0 mcl4k 4096 26 0 0 3 0 3 3 0 8 0 mcl2k2 2112 14 0 0 1 0 1 1 0 8 0 mcl2k 2048 424 0 0 42 20 22 42 0 8 2 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 1434 0 0 58 0 58 58 0 8 0 bufpl 288 13734 0 7409 454 1 453 453 0 8 0 anonpl 24 768973 0 757395 159 66 93 104 0 186 7 amapchunkpl 152 217663 0 216726 111 71 40 51 0 158 1 amappl16 200 16280 0 16012 82 58 24 27 0 8 8 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 195 0 180 2 1 1 2 0 8 0 amappl13 176 8 0 8 2 2 0 1 0 8 0 amappl12 168 7867 0 7827 2 0 2 2 0 8 0 amappl11 160 78 0 67 1 0 1 1 0 8 0 amappl10 152 47 0 34 1 0 1 1 0 8 0 amappl9 144 269 0 268 1 0 1 1 0 8 0 amappl8 136 486 0 350 5 0 5 5 0 8 0 amappl7 128 111 0 97 1 0 1 1 0 8 0 amappl6 120 368 0 339 2 1 1 2 0 8 0 amappl5 112 308 0 299 1 0 1 1 0 8 0 amappl4 104 746 0 704 3 1 2 3 0 8 0 amappl3 96 42649 0 42545 21 17 4 4 0 8 1 amappl2 88 7565 0 7485 3 1 2 3 0 8 0 amappl1 80 33353 0 32792 22 9 13 22 0 8 0 amappl 88 67679 0 67417 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 72 136 0 6 3 0 3 3 0 8 0 uaddrrnd 24 7081 0 7044 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 7081 0 7044 1 0 1 1 0 8 0 vmmpekpl 168 60417 0 60367 3 0 3 3 0 8 0 vmmpepl 168 421037 0 418549 219 93 126 126 0 357 11 vmsppl 464 7080 0 7044 7 2 5 6 0 8 0 rwobjpl 56 112754 0 105261 117 7 110 110 0 8 2 pdppl 4096 14170 0 14088 390 304 86 96 0 8 4 pvpl 32 2154700 0 2136672 492 306 186 361 0 265 26 pmappl 248 7080 0 7044 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1403 0 532 26 0 26 26 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82bafff0) 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+0x29 kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 sys/dev/kcov.c:158 __mp_lock(ffffffff82c532e8) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c532e8) at __mp_lock+0x133 sys/kern/kern_lock.c:147 intr_handler(ffff80002fe43ca0,ffff80000007b080) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7a605855b8a0, count: 8 ddb{0}> trace x86_ipi_db(ffffffff82bafff0) 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+0x29 kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 sys/dev/kcov.c:158 __mp_lock(ffffffff82c532e8) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c532e8) at __mp_lock+0x133 sys/kern/kern_lock.c:147 intr_handler(ffff80002fe43ca0,ffff80000007b080) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7a605855b8a0, 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(ffffffff8279d30b) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281e44b,ffffffff8283c848,2bb,ffffffff827a2681) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(a5ebc949) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f194000) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f194000) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800021281548,fffffd806f194000,fffffd806f194088,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021281548,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021281548) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021281548,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021281548,ffff80002fe3ddb0,ffff80002fe3de00) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002fe3de80) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002fe3de80) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b0ad254cb50, count: 2 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279d30b) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281e44b,ffffffff8283c848,2bb,ffffffff827a2681) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(a5ebc949) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f194000) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f194000) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800021281548,fffffd806f194000,fffffd806f194088,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021281548,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021281548) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021281548,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021281548,ffff80002fe3ddb0,ffff80002fe3de00) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002fe3de80) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002fe3de80) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b0ad254cb50, count: -13