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 222113 56217 0 0x14000 0x200 0 zerothread db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8346752f) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8341571b,ffffffff8341e064,3b7,ffffffff8341e0e7) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a3bb500,ffffffff8335c65f) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b92,ffff80002a3bb4f8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b92,1,2000,ffff80003c416558) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002a37c7d0) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c725b10,1,fffffd80097fb548,ffff80003c416558) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80739e3c98,ffff80003c416558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80739e3c98,ffff80003c416558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80739e3c98,ffff80003c416558) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd80739e3c98,ffff80003c416558) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003c416558) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003c416558,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003c416558,ffff80002a37cb40,ffff80002a37ca90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80002a37cb30, 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(ffffffff8346752f) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8341571b,ffffffff8341e064,3b7,ffffffff8341e0e7) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a3bb500,ffffffff8335c65f) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b92,ffff80002a3bb4f8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b92,1,2000,ffff80003c416558) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002a37c7d0) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c725b10,1,fffffd80097fb548,ffff80003c416558) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80739e3c98,ffff80003c416558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80739e3c98,ffff80003c416558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80739e3c98,ffff80003c416558) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd80739e3c98,ffff80003c416558) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003c416558) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003c416558,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003c416558,ffff80002a37cb40,ffff80002a37ca90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a37cb40) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a37cb40) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79ca3632c090, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a37c5a0 rbx 0xffff8000299dedd7 rdx 0 rcx 0xffff80003c416558 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x76d6375a626ab788 r11 0xa05f98515040d623 r12 0xffff8000299debd8 r13 0 r14 0 r15 0x1 rip 0xffffffff82767ef5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a37c590 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=295478 pid=44929 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c416558 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c417228,0xffff80003c417758 process=0xffff80003c41f568 user=0xffff80002a377000, vmspace=0xfffffd806c1eab58 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 13225 24004 45617 0 2 0 syz-executor 13225 332900 45617 0 3 0x4000080 fsleep syz-executor 24598 497391 1315 0 3 0x80 nanoslp syz-executor 24598 326045 1315 0 3 0x4000000 smrbar syz-executor 49370 318836 25879 0 2 0 syz-executor 49370 395935 25879 0 3 0x4000000 biowait syz-executor 49370 51617 25879 0 3 0x4000080 fsleep syz-executor 49370 481860 25879 0 3 0x4000080 fsleep syz-executor 17905 150669 1 0 3 0x100083 ttyin getty 97036 443114 92151 0 2 0x2 syz-executor 35202 207380 92151 0 3 0x2 biowait syz-executor 74910 149637 92151 0 3 0x82 nanoslp syz-executor 25879 385230 92151 0 3 0x82 nanoslp syz-executor 97817 232608 92151 0 3 0x82 wait syz-executor 45617 25998 92151 0 3 0x82 nanoslp syz-executor 41820 470712 0 0 3 0x14200 bored sosplice 85372 115974 5545 0 3 0x100082 sbwait arp 5545 31221 1 0 3 0x10008a sigsusp sh 1315 28891 92151 0 3 0x82 nanoslp syz-executor 78158 323476 92151 0 3 0x82 nanoslp syz-executor 92151 405521 24366 0 2 0x2 syz-executor 24366 455056 92505 0 3 0x10008a sigsusp ksh 92505 247489 40040 0 3 0x98 kqread sshd-session 40040 122069 44783 0 3 0x92 kqread sshd-session 44783 305021 1 0 3 0x88 kqread sshd 98307 484235 65198 74 3 0x1100092 bpf pflogd 65198 472561 1 0 3 0x80 sbwait pflogd 34243 7021 91077 73 3 0x1100090 kqread syslogd 91077 385469 1 0 3 0x100082 sbwait syslogd 30603 58894 1 0 3 0x100080 kqread resolvd 18465 97500 82946 77 3 0x100092 kqread dhcpleased 73789 140047 82946 77 3 0x100092 kqread dhcpleased 82946 252427 1 0 3 0x80 kqread dhcpleased 16593 278241 0 0 3 0x14200 bored smr 56217 222113 0 0 7 0x14200 zerothread 50615 43827 0 0 3 0x14200 aiodoned aiodoned 43917 342748 0 0 3 0x14200 syncer update 5726 363492 0 0 3 0x14200 cleaner cleaner 76041 156349 0 0 3 0x14200 reaper reaper 49923 467301 0 0 3 0x14200 pgdaemon pagedaemon 58220 487371 0 0 3 0x14200 bored viomb 97139 37896 0 0 3 0x40014200 acpi0 acpi0 18139 279340 0 0 3 0x40014200 idle1 98986 172695 0 0 3 0x14200 bored softnet3 48874 493921 0 0 3 0x14200 bored softnet2 55585 62372 0 0 3 0x14200 bored softnet1 12224 233834 0 0 3 0x14200 bored softnet0 7213 138819 0 0 3 0x14200 bored systqmp 77839 143577 0 0 3 0x14200 bored systq 56772 333922 0 0 3 0x14200 tmoslp softclockmp 93529 373677 0 0 3 0x40014200 tmoslp softclock 97822 316550 0 0 3 0x40014200 idle0 1 424048 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff838d6c50) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 uvm_pagezero_thread+0x201 sys/uvm/uvm_pmemrange.c:2224 #4 proc_trampoline+0x10 Process 49370 (syz-executor) thread 0xffff8000ffffca48 (395935) exclusive rrwlock inode r = 0 (0xfffffd806e2c3c08) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x190 sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x23c sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:742 #9 Xsyscall+0x128 Process 35202 (syz-executor) thread 0xffff80003c432028 (207380) exclusive rrwlock inode r = 0 (0xfffffd806e0add20) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2bd sys/kern/vfs_subr.c:693 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e1cac00) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10228 11127K 13207K 166960K 19892 0 pcb 18 16K 18K 166960K 998 0 rtable 261 13K 13K 166960K 1038 0 pf 42 18K 21K 166960K 331 0 ifaddr 45 9K 10K 166960K 248 0 ifgroup 71 3K 3K 166960K 430 0 sysctl 4 1K 9K 166960K 94 0 counters 76 37K 38K 166960K 562 0 ioctlops 0 0K 4K 166960K 2717 0 iov 0 0K 40K 166960K 247 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1554 98K 98K 166960K 5480 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 79 0 VM map 2 1K 1K 166960K 2 0 sem 27 11K 11K 166960K 67 0 dirhash 12 2K 2K 166960K 102 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 248K 166960K 4223 0 sigio 0 0K 0K 166960K 151 0 proc 76 103K 128K 166960K 1148 0 subproc 81 5K 5K 166960K 165 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 736 0 in_multi 82 6K 7K 166960K 409 0 ether_multi 1 0K 0K 166960K 75 0 mrt 1 0K 0K 166960K 28 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 1246 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 70 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 248 162K 180K 166960K 39522 0 UVM aobj 87 7K 7K 166960K 99 0 pinsyscall 44 88K 106K 166960K 5460 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 297 0 NDP 15 0K 1K 166960K 167 0 temp 80 8688K 8816K 166960K 197684 0 kqueue 14 22K 34K 166960K 848 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 120 523 0 519 6 5 1 3 0 8 0 rtentry 176 307 0 205 5 0 5 5 0 8 0 unpcb 144 3780 0 3760 17 14 3 9 0 8 2 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 1824 0 1819 38 31 7 13 0 8 6 arp 128 46 0 23 1 0 1 1 0 8 0 inpcb 328 5773 0 5758 57 50 7 21 0 8 4 nd6 144 60 0 37 2 1 1 2 0 8 0 pkpcb 40 35 0 35 7 6 1 1 0 8 1 kcovpl 48 18 0 9 1 0 1 1 0 8 0 mppekey 1024 5 0 5 3 3 0 1 0 8 0 ppxss 1192 197 0 196 5 4 1 1 0 8 0 pppxif 1504 84 0 83 4 3 1 1 0 8 0 pffrag 232 92 0 87 1 0 1 1 0 482 0 pffrnode 88 87 0 82 1 0 1 1 0 8 0 pffrent 40 189 0 184 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 pfrktable 1344 3 0 3 1 1 0 1 0 8 0 pfstitem 24 317 0 198 1 0 1 1 0 8 0 pfstkey 128 317 0 198 4 0 4 4 0 8 0 pfstate 384 317 0 198 18 0 18 18 0 8 5 pfrule 1344 32 0 27 2 1 1 2 0 8 0 rttmr 136 7 0 7 6 5 1 1 0 8 1 art_heap8 4096 6 0 1 5 0 5 5 0 8 0 art_heap4 256 1485 0 1079 41 15 26 27 0 8 0 art_table 32 1491 0 1080 4 0 4 4 0 8 0 art_node 16 297 0 208 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semupl 112 6 0 6 5 5 0 1 0 8 0 semapl 112 56 0 31 1 0 1 1 0 8 0 shmpl 112 96 0 12 3 0 3 3 0 8 0 dirhash 1024 78 0 61 3 0 3 3 0 8 0 dino2pl 256 9295 0 7780 96 0 96 96 0 8 0 ffsino 288 9295 0 7780 109 0 109 109 0 8 0 nchpl 144 15111 0 14552 64 40 24 64 0 8 0 rtmask 32 23 0 23 8 7 1 1 0 8 1 uvmvnodes 80 6106 0 0 125 0 125 125 0 8 0 vnodes 216 6106 0 0 340 0 340 340 0 8 0 namei 1024 59045 0 59045 11 10 1 3 0 8 1 percpumem 16 296 0 243 1 0 1 1 0 8 0 kstatmem 264 272 0 238 6 3 3 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 26 0 26 9 8 1 1 0 8 1 scxspl 216 124008 0 124006 16 14 2 8 1 8 1 plimitpl 152 1066 0 1046 1 0 1 1 0 8 0 sigapl 424 4501 0 4450 9 1 8 9 0 8 0 knotepl 120 875 0 0 24 0 24 24 0 8 0 kqueuepl 224 1913 0 1901 22 19 3 7 0 8 2 pipepl 336 786 0 755 20 17 3 8 0 8 0 fdescpl 520 4450 0 4418 3 0 3 3 0 8 0 filepl 160 34487 0 34243 50 35 15 21 0 8 0 lockfpl 104 2314 0 2312 3 2 1 2 0 8 0 lockfspl 48 1066 0 1064 1 0 1 1 0 8 0 sessionpl 144 33 0 24 1 0 1 1 0 8 0 pgrppl 48 133 0 115 1 0 1 1 0 8 0 ucredpl 104 4787 0 4774 1 0 1 1 0 8 0 zombiepl 144 4834 0 4831 1 0 1 1 0 8 0 processpl 1240 4501 0 4450 6 0 6 6 0 8 0 procpl 656 10989 0 10933 8 1 7 8 0 8 0 srpgc 96 24 0 24 7 6 1 1 0 8 1 sosppl 168 35 0 35 6 6 0 1 0 8 0 sockpl 728 10265 0 10226 86 75 11 25 0 8 6 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 109 0 0 14 0 14 14 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 120 0 0 10 0 10 10 0 8 0 mtagpl 96 63 0 0 2 0 2 2 0 8 0 mbufpl 256 5221 0 0 326 0 326 326 0 8 0 bufpl 280 51824 0 45697 440 1 439 440 0 8 0 anonpl 32 21199 0 0 171 0 171 171 0 246 0 amapchunkpl 152 137840 0 137328 64 31 33 37 0 158 7 amappl16 200 17640 0 17602 183 169 14 57 0 8 4 amappl15 192 7 0 6 1 0 1 1 0 8 0 amappl14 184 128 0 115 1 0 1 1 0 8 0 amappl13 176 5 0 5 2 2 0 1 0 8 0 amappl12 168 5205 0 5172 4 2 2 3 0 8 0 amappl11 160 51 0 37 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 274 0 273 2 1 1 1 0 8 0 amappl8 136 25 0 22 1 0 1 1 0 8 0 amappl7 128 167 0 153 1 0 1 1 0 8 0 amappl6 120 243 0 237 1 0 1 1 0 8 0 amappl5 112 155 0 145 1 0 1 1 0 8 0 amappl4 104 353 0 329 1 0 1 1 0 8 0 amappl3 96 28335 0 28224 4 0 4 4 0 8 0 amappl2 88 749 0 682 2 0 2 2 0 8 0 amappl1 80 25478 0 24852 15 1 14 15 0 8 0 amappl 88 37907 0 37735 5 0 5 5 0 92 0 dma65536 65536 2 0 2 1 1 0 1 0 8 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma4096 4096 2 0 2 2 1 1 1 0 8 1 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 8 0 8 2 2 0 1 0 8 0 dma128 128 262 0 262 8 7 1 1 0 8 1 dma64 64 7 0 7 2 2 0 1 0 8 0 dma32 32 9 0 9 3 3 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 98 0 12 2 0 2 2 0 8 0 uaddrrnd 24 4450 0 4418 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4450 0 4418 1 0 1 1 0 8 0 vmmpekpl 168 31051 0 30979 4 0 4 4 0 8 0 vmmpepl 168 282723 0 280666 199 75 124 141 0 357 14 vmsppl 480 4449 0 4418 5 0 5 5 0 8 0 rwobjpl 72 76447 0 69265 153 6 147 147 0 8 0 pdppl 4096 8908 0 8836 128 52 76 88 0 8 4 pvpl 32 28801 0 0 233 1 232 233 0 265 0 pmappl 256 4449 0 4418 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 821 0 137 20 0 20 20 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837e1ff0) 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_const_cmp4(b2dfce4280b4ca29,7f) at __sanitizer_cov_trace_const_cmp4+0x4f sys/dev/kcov.c:231 msleep_nsec(ffffffff838d6ab4,ffffffff838d6c40,7f,ffffffff8338fbb7,ffffffffffffffff) at msleep_nsec+0x1b2 sys/kern/kern_synch.c:202 uvm_pagezero_thread(ffff8000ffffc7b8) at uvm_pagezero_thread+0xe9 sys/uvm/uvm_pmemrange.c:2210 end trace frame: 0x0, count: 9 ddb{0}> trace x86_ipi_db(ffffffff837e1ff0) 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_const_cmp4(b2dfce4280b4ca29,7f) at __sanitizer_cov_trace_const_cmp4+0x4f sys/dev/kcov.c:231 msleep_nsec(ffffffff838d6ab4,ffffffff838d6c40,7f,ffffffff8338fbb7,ffffffffffffffff) at msleep_nsec+0x1b2 sys/kern/kern_synch.c:202 uvm_pagezero_thread(ffff8000ffffc7b8) at uvm_pagezero_thread+0xe9 sys/uvm/uvm_pmemrange.c:2210 end trace frame: 0x0, count: -6 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(ffffffff8346752f) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8341571b,ffffffff8341e064,3b7,ffffffff8341e0e7) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a3bb500,ffffffff8335c65f) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b92,ffff80002a3bb4f8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b92,1,2000,ffff80003c416558) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002a37c7d0) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c725b10,1,fffffd80097fb548,ffff80003c416558) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80739e3c98,ffff80003c416558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80739e3c98,ffff80003c416558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80739e3c98,ffff80003c416558) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd80739e3c98,ffff80003c416558) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003c416558) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003c416558,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003c416558,ffff80002a37cb40,ffff80002a37ca90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80002a37cb30, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8346752f) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8341571b,ffffffff8341e064,3b7,ffffffff8341e0e7) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a3bb500,ffffffff8335c65f) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b92,ffff80002a3bb4f8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b92,1,2000,ffff80003c416558) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002a37c7d0) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c725b10,1,fffffd80097fb548,ffff80003c416558) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80739e3c98,ffff80003c416558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80739e3c98,ffff80003c416558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80739e3c98,ffff80003c416558) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd80739e3c98,ffff80003c416558) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003c416558) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003c416558,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003c416558,ffff80002a37cb40,ffff80002a37ca90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a37cb40) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a37cb40) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79ca3632c090, count: -16