panic: attempt to access user address 0x3fff7fe000b in supervisor mode Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *202586 37347 0 0 0x4000000 1K syz-executor.0 112937 76915 0 0x14000 0x200 0 systq 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(ffff800021b7cc60) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b in_delmulti(3fff7fdffff) at in_delmulti+0x95 sys/netinet/in.c:894 in_purgeaddr(ffff800000b36300) at in_purgeaddr+0x156 sys/netinet/in.c:740 in_ifdetach(ffff800000ae9800) at in_ifdetach+0x74 sys/netinet/in.c:949 if_detach(ffff800000ae9800) at if_detach+0x140 sys/net/if.c:1151 tun_clone_destroy(ffff800000ae9800) at tun_clone_destroy+0x179 sys/net/if_tun.c:312 ifioctl(fffffd80658594b0,80206979,ffff800021b7d230,ffff800020ab0018) at ifioctl+0x3ea sys/net/if.c:1938 fifo_ioctl(ffff800021b7d078) at fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:282 VOP_IOCTL(fffffd807b543de8,80206979,ffff800021b7d230,82,fffffd807f7c67e0,ffff800020ab0018) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd8061e807b8,80206979,ffff800021b7d230,ffff800020ab0018) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 end trace frame: 0xffff800021b7d330, 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 attempt to access user address 0x3fff7fe000b in supervisor mode ddb{1}> 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(ffff800021b7cc60) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b in_delmulti(3fff7fdffff) at in_delmulti+0x95 sys/netinet/in.c:894 in_purgeaddr(ffff800000b36300) at in_purgeaddr+0x156 sys/netinet/in.c:740 in_ifdetach(ffff800000ae9800) at in_ifdetach+0x74 sys/netinet/in.c:949 if_detach(ffff800000ae9800) at if_detach+0x140 sys/net/if.c:1151 tun_clone_destroy(ffff800000ae9800) at tun_clone_destroy+0x179 sys/net/if_tun.c:312 ifioctl(fffffd80658594b0,80206979,ffff800021b7d230,ffff800020ab0018) at ifioctl+0x3ea sys/net/if.c:1938 fifo_ioctl(ffff800021b7d078) at fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:282 VOP_IOCTL(fffffd807b543de8,80206979,ffff800021b7d230,82,fffffd807f7c67e0,ffff800020ab0018) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd8061e807b8,80206979,ffff800021b7d230,ffff800020ab0018) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 sys_ioctl(ffff800020ab0018,ffff800021b7d348,ffff800021b7d390) at sys_ioctl+0x5b9 syscall(ffff800021b7d410) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021b7d410) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x40083a11460, count: -17 ddb{1}> show registers rdi 0xffffffff819fa9f7 db_enter+0x17 rsi 0x35768 acpi_pdirpa+0x215d0 rbp 0xffff800021b7cad0 rbx 0xffff800021b7cb80 rdx 0x35769 acpi_pdirpa+0x215d1 rcx 0xffff800022d58000 rax 0xffff800022d58000 r8 0xffffffff8138d74f kprintf+0x16f r9 0x1 r10 0x25 r11 0xe531e4ebe0e1c5d1 r12 0x3000000008 r13 0xffff800021b7cae0 r14 0x100 r15 0x1 rip 0xffffffff819fa9f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021b7cac0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=202586 stat=onproc flags process=0 proc=4000000 pri=78, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab0780,0xffff800020ab02a0 process=0xffff800020add180 user=0xffff800021b78000, vmspace=0xfffffd807f008a10 estcpu=28, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 43912 381720 46898 0 3 0x80 nanosleep syz-executor.1 43912 200975 46898 0 3 0x4000080 kqread syz-executor.1 43912 313837 46898 0 3 0x4000080 fsleep syz-executor.1 37347 34448 73476 0 2 0 syz-executor.0 *37347 202586 73476 0 7 0x4000000 syz-executor.0 37347 326360 73476 0 3 0x4000080 fsleep syz-executor.0 73476 84020 52220 0 3 0x82 nanosleep syz-executor.0 46898 386536 52220 0 3 0x82 nanosleep syz-executor.1 44218 104498 0 0 3 0x14200 bored sosplice 52220 387314 12780 0 3 0x82 thrsleep syz-fuzzer 52220 316338 12780 0 3 0x4000082 thrsleep syz-fuzzer 52220 194726 12780 0 3 0x4000082 thrsleep syz-fuzzer 52220 185694 12780 0 3 0x4000082 thrsleep syz-fuzzer 52220 53373 12780 0 3 0x4000082 thrsleep syz-fuzzer 52220 169734 12780 0 3 0x4000082 thrsleep syz-fuzzer 52220 225867 12780 0 3 0x4000082 thrsleep syz-fuzzer 52220 110480 12780 0 3 0x4000082 thrsleep syz-fuzzer 52220 117815 12780 0 3 0x4000082 thrsleep syz-fuzzer 52220 133121 12780 0 3 0x4000082 kqread syz-fuzzer 12780 504182 61062 0 3 0x10008a pause ksh 61062 421071 82902 0 3 0x92 select sshd 14617 3302 1 0 3 0x100083 ttyin getty 82902 234937 1 0 3 0x80 select sshd 62842 4021 46677 74 3 0x100092 bpf pflogd 46677 55864 1 0 3 0x80 netio pflogd 58203 30545 33447 73 3 0x100090 kqread syslogd 33447 301392 1 0 3 0x100082 netio syslogd 67418 410704 1 77 2 0x100090 dhclient 28924 403986 1 0 3 0x80 poll dhclient 65231 249389 0 0 3 0x14200 pgzero zerothread 70308 399462 0 0 3 0x14200 aiodoned aiodoned 68150 114560 0 0 3 0x14200 syncer update 10412 251737 0 0 3 0x14200 cleaner cleaner 55578 406081 0 0 3 0x14200 reaper reaper 7156 474323 0 0 3 0x14200 pgdaemon pagedaemon 28664 51350 0 0 3 0x14200 bored crynlk 46246 62464 0 0 3 0x14200 bored crypto 2103 212501 0 0 3 0x40014200 acpi0 acpi0 6574 156859 0 0 3 0x40014200 idle1 34273 116258 0 0 3 0x14200 bored softnet 72468 384122 0 0 2 0x14200 systqmp 76915 112937 0 0 7 0x14200 systq 75267 56629 0 0 3 0x40014200 bored softclock 57881 59458 0 0 3 0x40014200 idle0 82989 83254 0 0 3 0x14200 bored smr 1 199777 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 37347 (syz-executor.0) thread 0xffff800020ab0018 (202586) exclusive rwlock netlock r = 0 (0xffffffff824d93d8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 if_detach+0x70 sys/net/if.c:1129 #2 tun_clone_destroy+0x179 sys/net/if_tun.c:312 #3 ifioctl+0x3ea sys/net/if.c:1938 #4 fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:282 #5 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 #6 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:533 #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 (0xffffffff826650d8) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9547 6559K 6813K 78643K 11557 0 0 pcb 13 8K 8K 78643K 81 0 0 rtable 98 3K 4K 78643K 493 0 0 ifaddr 81 15K 16K 78643K 207 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1505 0 0 iov 0 0K 16K 78643K 68 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1217 76K 77K 78643K 1652 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 6 0 0 VM map 3 1K 2K 78643K 5 0 0 sem 12 0K 0K 78643K 328 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1809 196K 290K 78643K 12766 0 0 file desc 6 17K 25K 78643K 411 0 0 sigio 0 0K 0K 78643K 2 0 0 proc 60 63K 95K 78643K 621 0 0 subproc 32 2K 2K 78643K 85 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 45 0 0 in_multi 62 3K 3K 78643K 105 0 0 ether_multi 1 0K 0K 78643K 3 0 0 mrt 0 0K 0K 78643K 5 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 138 609K 609K 78643K 138 0 0 exec 0 0K 1K 78643K 277 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 116 38K 38K 78643K 2443 0 0 UVM aobj 130 4K 4K 78643K 137 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 53 0 0 NDP 14 0K 0K 78643K 45 0 0 temp 147 3559K 3661K 78643K 36904 0 0 kqueue 0 0K 0K 78643K 2 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 17 0 12 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 56 0 54 1 0 1 1 0 8 0 rtentry 112 84 0 45 2 0 2 2 0 8 0 unpcb 120 259 0 247 1 0 1 1 0 8 0 syncache 264 10 0 10 3 2 1 1 0 8 1 tcpqe 32 21 0 21 2 1 1 1 0 8 1 tcpcb 544 257 0 252 3 2 1 2 0 8 0 ipq 40 1 0 1 1 0 1 1 0 8 1 ipqe 40 2 0 2 1 0 1 1 0 8 1 inpcb 280 635 0 626 2 0 2 2 0 8 1 rttmr 72 2 0 2 1 1 0 1 0 8 0 nd6 48 10 0 6 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 1 0 1 0 8 0 ppxss 1128 16 0 15 3 2 1 1 0 8 0 pffrag 232 9 0 9 1 0 1 1 0 482 1 pffrnode 88 9 0 9 1 0 1 1 0 8 1 pffrent 40 153 0 153 1 0 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 32 0 7 1 0 1 1 0 8 0 pfstkey 112 32 0 7 1 0 1 1 0 8 0 pfstate 328 32 0 7 3 0 3 3 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 368 0 147 15 0 15 15 0 8 0 art_table 32 369 0 147 2 0 2 2 0 8 0 art_node 16 83 0 44 1 0 1 1 0 8 0 sysvmsgpl 40 42 0 32 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 326 0 316 1 0 1 1 0 8 0 shmpl 112 135 0 7 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2071 0 664 46 0 46 46 0 8 0 ffsino 272 2071 0 664 95 1 94 95 0 8 0 nchpl 144 2961 0 1351 61 0 61 61 0 8 0 uvmvnodes 72 2359 0 0 43 0 43 43 0 8 0 vnodes 208 2359 0 0 125 0 125 125 0 8 0 namei 1024 10196 0 10196 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 1 0 0 1 0 1 1 0 8 0 vmpool 552 3 0 2 1 0 1 1 0 8 0 scxspl 192 8283 0 8283 10 9 1 7 0 8 1 plimitpl 152 36 0 28 1 0 1 1 0 8 0 sigapl 432 600 0 584 3 1 2 3 0 8 0 futexpl 56 9745 0 9743 1 0 1 1 0 8 0 knotepl 112 441 0 420 5 3 2 3 0 8 1 kqueuepl 104 363 0 357 1 0 1 1 0 8 0 pipepl 160 370 0 351 4 2 2 2 0 8 1 fdescpl 488 601 0 584 3 0 3 3 0 8 0 filepl 152 6010 0 5894 7 1 6 7 0 8 1 lockfpl 104 114 0 113 1 0 1 1 0 8 0 lockfspl 48 38 0 37 1 0 1 1 0 8 0 sessionpl 112 21 0 10 1 0 1 1 0 8 0 pgrppl 48 31 0 20 1 0 1 1 0 8 0 ucredpl 96 1835 0 1825 1 0 1 1 0 8 0 zombiepl 144 584 0 584 1 0 1 1 0 8 1 processpl 896 617 0 584 4 0 4 4 0 8 0 procpl 632 1541 0 1495 5 0 5 5 0 8 1 srpgc 64 8 0 6 2 1 1 1 0 8 0 sosppl 128 8 0 8 1 1 0 1 0 8 0 sockpl 384 960 0 937 7 3 4 6 0 8 1 mcl64k 65536 9 0 0 2 0 2 2 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 12 0 0 2 0 2 2 0 8 0 mcl4k 4096 13 0 0 2 0 2 2 0 8 0 mcl2k 2048 206 0 0 25 0 25 25 0 8 0 mtagpl 80 20 0 0 1 0 1 1 0 8 0 mbufpl 256 464 0 0 28 0 28 28 0 8 0 bufpl 256 7539 0 1317 389 0 389 389 0 8 0 anonpl 16 83933 0 62834 103 16 87 100 0 124 1 amapchunkpl 152 4212 0 4049 14 7 7 14 0 158 0 amappl16 192 2982 0 1820 71 11 60 69 0 8 1 amappl15 184 175 0 174 1 0 1 1 0 8 0 amappl14 176 72 0 67 1 0 1 1 0 8 0 amappl13 168 60 0 59 1 0 1 1 0 8 0 amappl12 160 87 0 85 2 1 1 1 0 8 0 amappl11 152 93 0 77 1 0 1 1 0 8 0 amappl10 144 102 0 95 1 0 1 1 0 8 0 amappl9 136 642 0 639 1 0 1 1 0 8 0 amappl8 128 198 0 169 2 1 1 2 0 8 0 amappl7 120 143 0 134 1 0 1 1 0 8 0 amappl6 112 81 0 68 1 0 1 1 0 8 0 amappl5 104 244 0 228 1 0 1 1 0 8 0 amappl4 96 774 0 746 1 0 1 1 0 8 0 amappl3 88 211 0 204 1 0 1 1 0 8 0 amappl2 80 3852 0 3768 3 0 3 3 0 8 0 amappl1 72 23397 0 22929 25 15 10 20 0 8 0 amappl 80 1847 0 1795 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 18 0 17 1 0 1 1 0 8 0 aobjpl 64 136 0 7 3 0 3 3 0 8 0 uaddrrnd 24 604 0 584 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 604 0 584 1 0 1 1 0 8 0 vmmpekpl 168 9118 0 9084 3 1 2 2 0 8 0 vmmpepl 168 84174 0 81735 160 24 136 150 0 357 29 vmsppl 368 600 0 584 2 0 2 2 0 8 0 pdppl 4096 1215 0 1173 6 0 6 6 0 8 0 pvpl 32 249593 0 225396 231 22 209 231 0 265 10 pmappl 232 603 0 586 3 1 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 579 0 6 17 0 17 17 0 8 0