panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 951 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 76108 26931 0 0 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8336edd9) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833afff6,ffffffff833c2f1e,3b7,ffffffff833ed01e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c49af08,ffffffff8336a3ec) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff80003c49af00) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,83,2000,ffff80003c43e2c8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003901b3f0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80663e77e0,83,fffffd80097fb340,ffff80003c43e2c8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806663a9b0,ffff80003c43e2c8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806663a9b0,ffff80003c43e2c8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806663a9b0,ffff80003c43e2c8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806663a9b0,ffff80003c43e2c8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c43e2c8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c43e2c8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c43e2c8,ffff80003901b760,ffff80003901b6b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003901b750, count: 0 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 "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 951 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8336edd9) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833afff6,ffffffff833c2f1e,3b7,ffffffff833ed01e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c49af08,ffffffff8336a3ec) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff80003c49af00) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,83,2000,ffff80003c43e2c8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003901b3f0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80663e77e0,83,fffffd80097fb340,ffff80003c43e2c8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806663a9b0,ffff80003c43e2c8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806663a9b0,ffff80003c43e2c8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806663a9b0,ffff80003c43e2c8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806663a9b0,ffff80003c43e2c8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c43e2c8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c43e2c8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c43e2c8,ffff80003901b760,ffff80003901b6b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003901b760) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003901b760) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73a061cc61e0, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003901b1c0 rbx 0xffff8000299eeddf rdx 0 rcx 0xffff80003c43e2c8 rax 0xffff8000299edff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x50627cb1da9e5fac r11 0xbf0dc8a35e373599 r12 0xffff8000299eebe0 r13 0 r14 0 r15 0x1 rip 0xffffffff83152035 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003901b1b0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=29924 pid=71007 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=77, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c43e2c8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff800033409248,0xffff800033408560 process=0xffff80003b026720 user=0xffff800039016000, vmspace=0xfffffd80663423f8 estcpu=27, cpticks=4, pctcpu=0.3, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 26931 76108 90429 0 7 0 syz-executor 36497 487342 73129 0 3 0x80 nanoslp syz-executor 36497 53431 73129 0 3 0x4000080 kqread syz-executor 36497 269699 73129 0 2 0x4000000 syz-executor 42219 295758 30608 -1 3 0x90 nanoslp syz-executor 42219 244044 30608 -1 3 0x4000090 kqread syz-executor 42219 189091 30608 -1 3 0x4000090 fsleep syz-executor 40793 514801 57214 0 3 0x80 nanoslp syz-executor 40793 477277 57214 0 3 0x4000080 kqsel syz-executor 40793 443577 57214 0 3 0x4000080 fsleep syz-executor 29004 489557 7646 0 3 0x80 nanoslp syz-executor 29004 81458 7646 0 3 0x4000000 biowait syz-executor 29004 434783 7646 0 3 0x4000000 fltagain2 syz-executor 29004 132495 7646 0 3 0x4000000 pipecl syz-executor 29004 358057 7646 0 3 0x4000080 fsleep syz-executor 66144 67821 0 0 3 0x14200 acct acct 71464 256475 0 0 3 0x14200 bored sosplice 90429 361041 65393 0 3 0x82 nanoslp syz-executor 7646 202853 65393 0 3 0x82 nanoslp syz-executor 71611 248903 65393 0 3 0x82 nanoslp syz-executor 4767 493126 65393 0 2 0x10000002 syz-executor 73129 266039 65393 0 3 0x82 nanoslp syz-executor 57214 137569 65393 0 3 0x82 nanoslp syz-executor 30608 239695 65393 0 3 0x82 nanoslp syz-executor 10740 333604 65393 0 2 0x2 syz-executor 65393 33133 32142 0 3 0x82 kqread syz-executor 32142 351779 95264 0 3 0x10008a sigsusp ksh 95264 419374 9806 0 3 0x98 kqread sshd-session 9806 381183 87171 0 3 0x92 kqread sshd-session 71728 11082 1 0 3 0x100083 ttyin getty 87171 225222 1 0 3 0x88 kqread sshd 28752 265270 27092 74 3 0x1100092 bpf pflogd 27092 51993 1 0 3 0x80 sbwait pflogd 66916 81292 68839 73 3 0x1100090 kqread syslogd 68839 510678 1 0 3 0x100082 sbwait syslogd 68647 158339 1 0 3 0x100080 kqread resolvd 24100 450095 46069 77 3 0x100092 kqread dhcpleased 1344 62004 46069 77 3 0x100092 kqread dhcpleased 46069 33932 1 0 3 0x80 kqread dhcpleased 87712 8308 0 0 3 0x14200 bored smr 32309 471146 0 0 2 0x14200 zerothread 28848 510775 0 0 3 0x14200 aiodoned aiodoned 11799 198915 0 0 3 0x14200 syncer update 93399 142888 0 0 3 0x14200 cleaner cleaner 27278 393771 0 0 3 0x14200 reaper reaper 81456 13036 0 0 3 0x14200 pgdaemon pagedaemon 3008 180643 0 0 3 0x14200 bored viomb 51132 148837 0 0 3 0x40014200 acpi0 acpi0 76650 350897 0 0 3 0x40014200 idle1 42267 447422 0 0 3 0x14200 bored softnet7 3391 285269 0 0 3 0x14200 bored softnet6 10238 221465 0 0 3 0x14200 bored softnet5 85457 146642 0 0 3 0x14200 bored softnet4 90282 207083 0 0 3 0x14200 bored softnet3 76210 276654 0 0 3 0x14200 bored softnet2 1497 501411 0 0 3 0x14200 bored softnet1 48776 74399 0 0 3 0x14200 tqbarend softnet0 17852 504014 0 0 3 0x14200 smrbar systqmp 68612 496988 0 0 3 0x14200 bored systq 16336 154766 0 0 3 0x14200 tmoslp softclockmp 20620 21730 0 0 3 0x40014200 tmoslp softclock 8022 447491 0 0 3 0x40014200 idle0 1 389540 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 29004 (syz-executor) thread 0xffff800033408fb0 (81458) exclusive rrwlock inode r = 0 (0xfffffd806b80f330) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 Process 48776 (softnet0) thread 0xffff8000ffffe530 (74399) shared rwlock softnet0 r = 0 (0xffff80000002c078) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 Process 17852 (systqmp) thread 0xffff8000ffffe000 (504014) shared rwlock systqmp r = 0 (0xffffffff83848ff8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10205 11022K 11225K 166960K 11392 0 pcb 18 12K 28K 166960K 111 0 rtable 214 7K 7K 166960K 275 0 pf 36 17K 22K 166960K 69 0 ifaddr 44 7K 8K 166960K 57 0 ifgroup 57 2K 2K 166960K 82 0 sysctl 3 1K 9K 166960K 7 0 counters 72 37K 38K 166960K 96 0 ioctlops 0 0K 4K 166960K 1504 0 iov 0 0K 16K 166960K 5 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1342 84K 85K 166960K 1432 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 89K 166960K 259 0 sigio 0 0K 0K 166960K 1 0 proc 72 115K 147K 166960K 548 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 22 0 in_multi 99 7K 7K 166960K 101 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 369 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 235 167K 176K 166960K 3955 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 41 82K 102K 166960K 1342 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 6 0 NDP 13 0K 2K 166960K 37 0 temp 43 8643K 8707K 166960K 4545 0 kqueue 16 26K 30K 166960K 39 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 47 0 44 1 0 1 1 0 8 0 rtentry 176 99 0 3 5 0 5 5 0 8 0 unpcb 144 227 0 208 6 0 6 6 0 8 5 syncache 336 4 0 4 2 1 1 1 0 8 1 tcpcb 736 44 0 37 1 0 1 1 0 8 0 arp 128 10 0 0 1 0 1 1 0 8 0 inpcb 328 162 0 151 3 1 2 2 0 8 0 nd6 144 18 0 0 1 0 1 1 0 8 0 pkpcb 40 12 0 12 2 1 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 11 0 9 1 0 1 1 0 8 0 pppxif 1504 1 0 0 1 0 1 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 0 0 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 29 0 0 1 0 1 1 0 8 0 pfstkey 128 29 0 0 1 0 1 1 0 8 0 pfstate 384 29 0 0 3 0 3 3 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 446 0 0 28 0 28 28 0 8 0 art_table 40 447 0 0 5 0 5 5 0 8 0 art_node 32 99 0 12 1 0 1 1 0 8 0 semapl 112 3 0 0 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1777 0 259 96 0 96 96 0 8 0 ffsino 296 1777 0 259 118 0 118 118 0 8 0 nchpl 144 2139 0 438 64 0 64 64 0 8 0 rtmask 32 4 0 4 1 0 1 1 0 8 1 uvmvnodes 80 1901 0 0 39 0 39 39 0 8 0 vnodes 216 1901 0 0 106 0 106 106 0 8 0 namei 1024 6541 0 6541 2 1 1 1 0 8 1 percpumem 16 63 0 12 1 0 1 1 0 8 0 kstatmem 264 44 0 15 3 0 3 3 0 8 0 scxspl 216 9187 0 9186 10 9 1 8 1 8 0 plimitpl 152 50 0 32 1 0 1 1 0 8 0 sigapl 424 564 0 509 7 0 7 7 0 8 0 knotepl 120 536 0 0 17 0 17 17 0 8 0 kqueuepl 224 55 0 39 2 0 2 2 0 8 0 pipepl 344 111 0 83 3 0 3 3 0 8 0 fdescpl 528 540 0 510 3 0 3 3 0 8 0 filepl 160 2302 0 2077 16 0 16 16 0 8 4 lockfpl 104 117 0 115 1 0 1 1 0 8 0 lockfspl 48 26 0 24 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 190 0 176 1 0 1 1 0 8 0 zombiepl 144 511 0 509 1 0 1 1 0 8 0 processpl 1248 564 0 509 5 0 5 5 0 8 0 procpl 664 801 0 736 7 0 7 7 0 8 1 sosppl 168 2 0 2 1 0 1 1 0 8 1 sockpl 752 549 0 516 17 0 17 17 0 8 13 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 130 0 0 17 0 17 17 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1144 0 0 72 0 72 72 0 8 0 bufpl 280 3751 0 127 259 0 259 259 0 8 0 anonpl 32 7120 0 0 58 0 58 58 0 246 0 amapchunkpl 152 12241 0 11758 34 7 27 27 0 158 4 amappl16 200 2275 0 2150 13 3 10 10 0 8 2 amappl15 192 17 0 17 1 1 0 1 0 8 0 amappl14 184 114 0 102 1 0 1 1 0 8 0 amappl13 176 9 0 8 1 0 1 1 0 8 0 amappl12 168 1186 0 1157 3 1 2 2 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 3 0 3 1 1 0 1 0 8 0 amappl9 144 287 0 287 1 1 0 1 0 8 0 amappl8 136 22 0 20 1 0 1 1 0 8 0 amappl7 128 107 0 95 1 0 1 1 0 8 0 amappl6 120 178 0 175 1 0 1 1 0 8 0 amappl5 112 129 0 119 1 0 1 1 0 8 0 amappl4 104 303 0 284 1 0 1 1 0 8 0 amappl3 96 2099 0 1990 4 0 4 4 0 8 0 amappl2 88 646 0 584 2 0 2 2 0 8 0 amappl1 80 8849 0 8254 16 1 15 15 0 8 0 amappl 88 3261 0 3100 5 0 5 5 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 540 0 510 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 540 0 510 1 0 1 1 0 8 0 vmmpekpl 168 6088 0 6046 2 0 2 2 0 8 0 vmmpepl 168 41534 0 39518 95 0 95 95 0 357 1 vmsppl 488 539 0 510 6 1 5 5 0 8 1 rwobjpl 80 16066 0 13131 62 1 61 61 0 8 0 pdppl 4096 1088 0 1020 100 26 74 84 0 8 6 pvpl 32 14825 0 0 121 0 121 121 0 265 1 pmappl 256 539 0 510 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 334 0 30 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83837ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff8398dd88) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8398dd88) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 intr_handler(ffff800037815790,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff8398dd88) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8398dd88) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 sys_mmap(ffff80003c43e560,ffff800037815ac0,ffff800037815a10) at sys_mmap+0x64b sys/uvm/uvm_mmap.c:292 syscall(ffff800037815ac0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800037815ac0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x782f320ba4d0, count: 3 ddb{0}> trace x86_ipi_db(ffffffff83837ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff8398dd88) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8398dd88) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 intr_handler(ffff800037815790,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff8398dd88) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8398dd88) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 sys_mmap(ffff80003c43e560,ffff800037815ac0,ffff800037815a10) at sys_mmap+0x64b sys/uvm/uvm_mmap.c:292 syscall(ffff800037815ac0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800037815ac0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x782f320ba4d0, count: -12 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8336edd9) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833afff6,ffffffff833c2f1e,3b7,ffffffff833ed01e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c49af08,ffffffff8336a3ec) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff80003c49af00) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,83,2000,ffff80003c43e2c8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003901b3f0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80663e77e0,83,fffffd80097fb340,ffff80003c43e2c8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806663a9b0,ffff80003c43e2c8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806663a9b0,ffff80003c43e2c8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806663a9b0,ffff80003c43e2c8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806663a9b0,ffff80003c43e2c8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c43e2c8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c43e2c8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c43e2c8,ffff80003901b760,ffff80003901b6b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003901b750, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8336edd9) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833afff6,ffffffff833c2f1e,3b7,ffffffff833ed01e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c49af08,ffffffff8336a3ec) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff80003c49af00) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,83,2000,ffff80003c43e2c8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003901b3f0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80663e77e0,83,fffffd80097fb340,ffff80003c43e2c8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806663a9b0,ffff80003c43e2c8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806663a9b0,ffff80003c43e2c8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806663a9b0,ffff80003c43e2c8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806663a9b0,ffff80003c43e2c8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c43e2c8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c43e2c8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c43e2c8,ffff80003901b760,ffff80003901b6b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003901b760) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003901b760) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73a061cc61e0, count: -16