panic: attempt to access user address 0xe38609ff5e0 in supervisor mode Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 290682 13597 0 0 0 1 syz-executor.1 * 57130 13597 0 0 0x4000000 0K syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 pageflttrap() at pageflttrap+0x40b kerntrap(ffff800023bccf70) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287 alltraps_kern_meltdown(6,0,0,3,ffff800000b28000,ffff800000dc8500) at alltraps_kern_meltdown+0x7b in6_purgeaddr(ffff800000dc8500) at in6_purgeaddr+0x149 sys/netinet6/in6.c:915 in6_ifdetach(ffff800000b28000) at in6_ifdetach+0x74 sys/netinet6/in6_ifattach.c:422 if_detach(ffff800000b28000) at if_detach+0x155 sys/net/if.c:1110 tun_clone_destroy(ffff800000b28000) at tun_clone_destroy+0x1c7 sys/net/if_tun.c:278 ifioctl(fffffd806f6d4900,80206979,ffff800023bcd530,ffff800020acfb50) at ifioctl+0x3f0 sys/net/if.c:1877 fifo_ioctl(ffff800023bcd378) at fifo_ioctl+0x9c sys/miscfs/fifofs/fifo_vnops.c:276 VOP_IOCTL(fffffd80668a8280,80206979,ffff800023bcd530,3,fffffd807f7c6720,ffff800020acfb50) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd806677b1e0,80206979,ffff800023bcd530,ffff800020acfb50) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:536 sys_ioctl(ffff800020acfb50,ffff800023bcd648,ffff800023bcd690) at sys_ioctl+0x5b9 end trace frame: 0xffff800023bcd700, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic attempt to access user address 0xe38609ff5e0 in supervisor mode ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 pageflttrap() at pageflttrap+0x40b kerntrap(ffff800023bccf70) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287 alltraps_kern_meltdown(6,0,0,3,ffff800000b28000,ffff800000dc8500) at alltraps_kern_meltdown+0x7b in6_purgeaddr(ffff800000dc8500) at in6_purgeaddr+0x149 sys/netinet6/in6.c:915 in6_ifdetach(ffff800000b28000) at in6_ifdetach+0x74 sys/netinet6/in6_ifattach.c:422 if_detach(ffff800000b28000) at if_detach+0x155 sys/net/if.c:1110 tun_clone_destroy(ffff800000b28000) at tun_clone_destroy+0x1c7 sys/net/if_tun.c:278 ifioctl(fffffd806f6d4900,80206979,ffff800023bcd530,ffff800020acfb50) at ifioctl+0x3f0 sys/net/if.c:1877 fifo_ioctl(ffff800023bcd378) at fifo_ioctl+0x9c sys/miscfs/fifofs/fifo_vnops.c:276 VOP_IOCTL(fffffd80668a8280,80206979,ffff800023bcd530,3,fffffd807f7c6720,ffff800020acfb50) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd806677b1e0,80206979,ffff800023bcd530,ffff800020acfb50) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:536 sys_ioctl(ffff800020acfb50,ffff800023bcd648,ffff800023bcd690) at sys_ioctl+0x5b9 syscall(ffff800023bcd710) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023bcd710) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff36,0,3,e3608dc1010) at Xsyscall+0x128 end of kernel end trace frame: 0xe38ac076810, count: -16 ddb{0}> show registers rdi 0xffffffff81126747 db_enter+0x17 rsi 0x4e38 __ALIGN_SIZE+0x3e38 rbp 0xffff800023bccde0 rbx 0xffff800023bcce90 rdx 0x4e39 __ALIGN_SIZE+0x3e39 rcx 0xffff800023dc4000 rax 0xffff800023dc4000 r8 0xffffffff8142715f kprintf+0x16f r9 0x1 r10 0x25 r11 0x9c64bc210bca30f4 r12 0x3000000008 r13 0xffff800023bccdf0 r14 0x100 r15 0x1 rip 0xffffffff81126748 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023bccdd0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=57130 stat=onproc flags process=0 proc=4000000 pri=79, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800020aceef8,0xffffffff8262d070 process=0xffff800020a4b888 user=0xffff800023bc8000, vmspace=0xfffffd807f00b2e0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 13597 290682 12461 0 7 0 syz-executor.1 *13597 57130 12461 0 7 0x4000000 syz-executor.1 66262 499478 11542 0 3 0x80 nanosleep syz-executor.0 66262 217260 11542 0 3 0x4000080 ttyin syz-executor.0 66262 350648 11542 0 3 0x4000080 fsleep syz-executor.0 11542 23454 85628 0 3 0x82 nanosleep syz-executor.0 12461 341832 85628 0 3 0x82 nanosleep syz-executor.1 21537 380852 0 0 3 0x14200 acct acct 44178 27263 0 0 3 0x14200 bored sosplice 85628 364324 79035 0 3 0x82 thrsleep syz-fuzzer 85628 305154 79035 0 3 0x4000082 nanosleep syz-fuzzer 85628 187810 79035 0 3 0x4000082 thrsleep syz-fuzzer 85628 154048 79035 0 3 0x4000082 thrsleep syz-fuzzer 85628 894 79035 0 3 0x4000082 thrsleep syz-fuzzer 85628 256907 79035 0 3 0x4000082 thrsleep syz-fuzzer 85628 22625 79035 0 3 0x4000082 thrsleep syz-fuzzer 85628 455287 79035 0 3 0x4000082 thrsleep syz-fuzzer 85628 360198 79035 0 3 0x4000082 thrsleep syz-fuzzer 85628 472140 79035 0 3 0x4000082 kqread syz-fuzzer 79035 504312 34024 0 3 0x10008a pause ksh 34024 405446 92808 0 3 0x92 select sshd 79493 345144 1 0 3 0x100083 ttyin getty 92808 245763 1 0 3 0x80 select sshd 49324 156591 30029 74 3 0x100092 bpf pflogd 30029 143925 1 0 3 0x80 netio pflogd 21532 326422 48573 73 3 0x100090 kqread syslogd 48573 56915 1 0 3 0x100082 netio syslogd 25525 337737 1 77 3 0x100090 poll dhclient 47137 197307 1 0 3 0x80 poll dhclient 69774 381992 0 0 3 0x14200 pgzero zerothread 89291 312818 0 0 3 0x14200 aiodoned aiodoned 24736 98003 0 0 3 0x14200 syncer update 3700 411125 0 0 3 0x14200 cleaner cleaner 5960 171717 0 0 3 0x14200 reaper reaper 2532 393142 0 0 3 0x14200 pgdaemon pagedaemon 30277 373752 0 0 3 0x14200 bored crynlk 11794 442777 0 0 3 0x14200 bored crypto 66688 264584 0 0 3 0x40014200 acpi0 acpi0 59019 207463 0 0 3 0x40014200 idle1 41826 72427 0 0 3 0x14200 bored softnet 33069 199310 0 0 3 0x14200 bored systqmp 67368 257850 0 0 3 0x14200 bored systq 24801 446884 0 0 3 0x40014200 bored softclock 14956 39374 0 0 3 0x40014200 idle0 6978 320217 0 0 3 0x14200 bored smr 1 181999 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 13597 (syz-executor.1) thread 0xffff800020acfb50 (57130) exclusive rwlock netlock r = 0 (0xffffffff824d7598) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 if_detach+0x75 sys/net/if.c:1085 #2 tun_clone_destroy+0x1c7 sys/net/if_tun.c:278 #3 ifioctl+0x3f0 sys/net/if.c:1877 #4 fifo_ioctl+0x9c sys/miscfs/fifofs/fifo_vnops.c:276 #5 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 #6 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:536 #7 sys_ioctl+0x5b9 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff826603d0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline] #1 syscall+0x400 sys/arch/amd64/amd64/trap.c:555 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9577 6444K 10629K 78643K 15322 0 0 pcb 13 8K 9K 78643K 482 0 0 rtable 95 4K 5K 78643K 1200 0 0 ifaddr 83 17K 18K 78643K 325 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1570 0 0 iov 0 0K 24K 78643K 367 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1273 80K 80K 78643K 3216 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 18 0 0 VM map 17 8K 8K 78643K 25 0 0 sem 12 0K 1K 78643K 555 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 25K 78643K 1733 0 0 sigio 0 0K 0K 78643K 134 0 0 proc 62 63K 95K 78643K 1125 0 0 subproc 32 2K 2K 78643K 238 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 1K 78643K 169 0 0 in_multi 25 1K 2K 78643K 249 0 0 ether_multi 1 0K 0K 78643K 13 0 0 mrt 1 0K 0K 78643K 8 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 66 291K 291K 78643K 66 0 0 exec 0 0K 1K 78643K 528 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 143 153K 154K 78643K 7063 0 0 UVM aobj 130 4K 4K 78643K 136 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 0K 78643K 357 0 0 NDP 19 0K 0K 78643K 106 0 0 temp 221 3560K 4196K 78643K 71403 0 0 kqueue 0 0K 0K 78643K 23 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 41 0 37 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 160 0 158 1 0 1 1 0 8 0 rtentry 112 238 0 202 2 0 2 2 0 8 0 unpcb 120 1123 0 1111 2 1 1 2 0 8 0 syncache 264 16 0 16 6 5 1 1 0 8 1 tcpqe 32 29 0 29 3 3 0 1 0 8 0 tcpcb 544 763 0 759 3 2 1 2 0 8 0 inpcb 280 2324 0 2317 5 3 2 2 0 8 1 rttmr 72 3 0 3 2 2 0 1 0 8 0 nd6 48 36 0 33 2 1 1 1 0 8 0 pkpcb 40 15 0 15 5 4 1 1 0 8 1 swfcl 56 3 0 0 1 0 1 1 0 8 0 ppxss 1128 28 0 28 5 4 1 1 0 8 1 pffrag 232 38 0 38 6 5 1 1 0 482 1 pffrnode 88 38 0 38 6 5 1 1 0 8 1 pffrent 40 1102 0 1102 6 5 1 1 0 8 1 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 170 0 93 1 0 1 1 0 8 0 pfstkey 112 170 0 93 3 0 3 3 0 8 0 pfstate 328 170 0 93 8 0 8 8 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 3 0 2 3 0 3 3 0 8 2 art_heap4 256 1050 0 846 18 4 14 14 0 8 0 art_table 32 1053 0 848 2 0 2 2 0 8 0 art_node 16 237 0 204 1 0 1 1 0 8 0 sysvmsgpl 40 46 0 37 1 0 1 1 0 8 0 semapl 112 553 0 543 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 dino1pl 128 3898 0 2490 46 0 46 46 0 8 0 ffsino 272 3898 0 2490 95 0 95 95 0 8 0 nchpl 144 6686 0 6207 61 41 20 61 0 8 0 uvmvnodes 72 5558 0 0 102 0 102 102 0 8 0 vnodes 208 5558 0 0 293 0 293 293 0 8 0 namei 1024 25042 0 25042 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 15 0 0 2 0 2 2 0 8 0 vmpool 552 23 0 8 2 0 2 2 0 8 0 scsiplug 64 2 0 2 2 2 0 1 0 8 0 scxspl 192 21585 0 21585 20 17 3 6 0 8 3 plimitpl 152 138 0 130 1 0 1 1 0 8 0 sigapl 432 1897 0 1881 3 1 2 3 0 8 0 futexpl 56 44496 0 44495 1 0 1 1 0 8 0 knotepl 112 498 0 479 1 0 1 1 0 8 0 kqueuepl 104 397 0 395 1 0 1 1 0 8 0 pipepl 112 1328 0 1307 2 0 2 2 0 8 1 fdescpl 488 1898 0 1881 3 0 3 3 0 8 0 filepl 152 17504 0 17398 14 8 6 9 0 8 1 lockfpl 104 677 0 676 1 0 1 1 0 8 0 lockfspl 48 223 0 222 1 0 1 1 0 8 0 sessionpl 112 30 0 19 1 0 1 1 0 8 0 pgrppl 48 56 0 45 1 0 1 1 0 8 0 ucredpl 96 1793 0 1784 1 0 1 1 0 8 0 zombiepl 144 1882 0 1882 1 0 1 1 0 8 1 processpl 896 1916 0 1882 4 0 4 4 0 8 0 procpl 632 5694 0 5648 6 1 5 5 0 8 0 srpgc 64 20 0 20 7 6 1 1 0 8 1 sosppl 128 35 0 35 4 4 0 1 0 8 0 sockpl 384 3693 0 3672 12 8 4 7 0 8 1 mcl64k 65536 21 0 0 3 0 3 3 0 8 0 mcl16k 16384 10 0 0 2 0 2 2 0 8 0 mcl12k 12288 18 0 0 2 0 2 2 0 8 0 mcl9k 9216 13 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 175 0 0 20 0 20 20 0 8 0 mtagpl 80 89 0 0 2 1 1 2 0 8 0 mbufpl 256 447 0 0 26 0 26 26 0 8 0 bufpl 256 11560 0 4512 441 0 441 441 0 8 0 anonpl 16 235568 0 217375 131 44 87 92 0 124 11 amapchunkpl 152 13105 0 12948 24 16 8 14 0 158 0 amappl16 192 9949 0 8908 103 45 58 64 0 8 4 amappl15 184 337 0 335 2 1 1 1 0 8 0 amappl14 176 235 0 230 1 0 1 1 0 8 0 amappl13 168 149 0 149 2 2 0 1 0 8 0 amappl12 160 514 0 512 2 1 1 1 0 8 0 amappl11 152 216 0 201 1 0 1 1 0 8 0 amappl10 144 68 0 62 1 0 1 1 0 8 0 amappl9 136 966 0 960 1 0 1 1 0 8 0 amappl8 128 519 0 483 2 0 2 2 0 8 0 amappl7 120 141 0 131 1 0 1 1 0 8 0 amappl6 112 204 0 193 1 0 1 1 0 8 0 amappl5 104 746 0 731 1 0 1 1 0 8 0 amappl4 96 2158 0 2124 1 0 1 1 0 8 0 amappl3 88 350 0 343 1 0 1 1 0 8 0 amappl2 80 13780 0 13697 3 1 2 3 0 8 0 amappl1 72 53189 0 52734 25 15 10 20 0 8 0 amappl 80 6150 0 6093 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 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 17 0 17 1 1 0 1 0 8 0 aobjpl 64 135 0 6 3 0 3 3 0 8 0 uaddrrnd 24 1921 0 1881 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1921 0 1881 1 0 1 1 0 8 0 vmmpekpl 168 19352 0 19310 3 0 3 3 0 8 0 vmmpepl 168 248313 0 245969 198 60 138 143 0 357 31 vmsppl 368 1897 0 1881 2 0 2 2 0 8 0 pdppl 4096 3849 0 3793 8 0 8 8 0 8 0 pvpl 32 648938 0 627524 268 58 210 215 0 265 32 pmappl 232 1920 0 1889 2 0 2 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 635 0 9 18 0 18 18 0 8 0