panic: kernel diagnostic assertion "sc->sc_dev == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/net/if_tun.c", line 319 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 126237 20727 0 0 0 1 syz-executor *463986 66791 0 0x2 0 0K ifconfig db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834a4dbb) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834e5602,ffffffff83533c69,13f,ffffffff83428f8b) at __assert+0x29 sys/kern/subr_prf.c:-1 tun_clone_destroy(ffff8000015fb000) at tun_clone_destroy+0x38a if_clone_destroy(ffff80002a241690) at if_clone_destroy+0x205 sys/net/if.c:1479 ifioctl(ffff8000016268e8,80206979,ffff80002a241690,ffff800030f94550) at ifioctl+0x59d sys/net/if.c:2160 sys_ioctl(ffff800030f94550,ffff80002a241870,ffff80002a2417c0) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff80002a241870) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a241870) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78c517699cb0, count: 6 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 *cpu0: kernel diagnostic assertion "sc->sc_dev == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/net/if_tun.c", line 319 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834a4dbb) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834e5602,ffffffff83533c69,13f,ffffffff83428f8b) at __assert+0x29 sys/kern/subr_prf.c:-1 tun_clone_destroy(ffff8000015fb000) at tun_clone_destroy+0x38a if_clone_destroy(ffff80002a241690) at if_clone_destroy+0x205 sys/net/if.c:1479 ifioctl(ffff8000016268e8,80206979,ffff80002a241690,ffff800030f94550) at ifioctl+0x59d sys/net/if.c:2160 sys_ioctl(ffff800030f94550,ffff80002a241870,ffff80002a2417c0) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff80002a241870) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a241870) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78c517699cb0, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a241440 rbx 0xffffffff83904e07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff800030f94550 rax 0xffffffff83903ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x30bf176be394c2a6 r11 0xb52c4c3a2d6cd7f4 r12 0xffffffff83904c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff8336ffa5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a241430 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (ifconfig) tid=463986 pid=66791 tcnt=1 stat=onproc flags process=2 proc=0 runpri=81, usrpri=82, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a220018,0xffff800030f954f0 process=0xffff8000fffece88 user=0xffff80002a23c000, vmspace=0xfffffd806c6d17b8 estcpu=32, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 20727 126237 38464 0 7 0 syz-executor 20727 197788 38464 0 2 0x4000000 syz-executor *66791 463986 4556 0 7 0x2 ifconfig 4556 108548 78519 0 2 0x100002 sh 25135 60569 37068 0 2 0 syz-executor 25135 269344 37068 0 2 0x4000000 syz-executor 33590 215521 84340 0 2 0 syz-executor 33590 63253 84340 0 3 0x4000080 fsleep syz-executor 81496 337402 60105 0 2 0 syz-executor 81496 18976 60105 0 2 0x4000000 syz-executor 2392 90955 428 0 2 0 syz-executor 2392 386585 428 0 3 0x4000080 fsleep syz-executor 8550 18894 55674 0 2 0xc80 syz-executor 8550 248165 55674 0 3 0x4000080 kqread syz-executor 8550 291361 55674 0 3 0x4000080 fsleep syz-executor 75292 465467 4603 0 2 0 syz-executor 75292 421294 4603 0 3 0x4000080 fsleep syz-executor 78519 417723 76451 0 3 0x82 wait syz-executor 36882 104633 0 0 3 0x14200 acct acct 64435 59912 1 0 3 0x100083 ttyin getty 84340 133785 76451 0 2 0xc82 syz-executor 60105 185888 76451 0 2 0xc82 syz-executor 37068 246351 76451 0 3 0x82 nanoslp syz-executor 428 465091 76451 0 2 0xc82 syz-executor 55674 361311 76451 0 2 0xc82 syz-executor 38464 256122 76451 0 3 0x82 nanoslp syz-executor 4603 471865 76451 0 2 0xc82 syz-executor 76451 377515 885 0 3 0x82 kqread syz-executor 885 143179 93967 0 3 0x10008a sigsusp ksh 93967 304515 55766 0 3 0x98 kqread sshd-session 55766 113075 44845 0 3 0x92 kqread sshd-session 44845 204494 1 0 3 0x88 kqread sshd 77561 128100 52722 74 3 0x1100092 bpf pflogd 52722 301119 1 0 3 0x80 sbwait pflogd 61279 85012 90166 73 3 0x1100090 kqread syslogd 90166 393476 1 0 3 0x100082 sbwait syslogd 54230 234782 1 0 3 0x100080 kqread resolvd 89344 476332 54452 77 2 0x100092 dhcpleased 92635 163786 54452 77 3 0x100092 kqread dhcpleased 54452 480679 1 0 3 0x80 kqread dhcpleased 48847 509155 0 0 3 0x14200 bored smr 43024 70535 0 0 2 0x14200 zerothread 43558 299540 0 0 3 0x14200 aiodoned aiodoned 15739 186242 0 0 3 0x14200 syncer update 40531 80882 0 0 3 0x14200 cleaner cleaner 98233 265948 0 0 3 0x14200 reaper reaper 57380 371483 0 0 3 0x14200 pgdaemon pagedaemon 38387 135148 0 0 3 0x14200 bored viomb 89664 191559 0 0 3 0x40014200 acpi0 acpi0 35384 181216 0 0 3 0x40014200 idle1 88221 15192 0 0 3 0x14200 bored softnet1 22295 290801 0 0 3 0x14200 bored softnet0 9109 144821 0 0 3 0x14200 bored systqmp 77897 108574 0 0 3 0x14200 bored systq 70695 91637 0 0 3 0x14200 tmoslp softclockmp 93937 171817 0 0 3 0x40014200 tmoslp softclock 90264 165575 0 0 3 0x40014200 idle0 1 394867 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 66791 (ifconfig) thread 0xffff800030f94550 (463986) exclusive rwlock clonelk r = 0 (0xffffffff8397f288) #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 if_clone_destroy+0x93 sys/net/if.c:-1 #3 ifioctl+0x59d sys/net/if.c:2160 #4 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839ca800) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 ifioctl+0x58c sys/net/if.c:2160 #2 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #3 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #4 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11066 12106K 12295K 166960K 12737 0 pcb 17 14K 15K 166960K 178 0 rtable 213 7K 8K 166960K 938 0 pf 38 18K 25K 166960K 344 0 ifaddr 40 7K 8K 166960K 137 0 ifgroup 55 2K 2K 166960K 179 0 sysctl 3 1K 9K 166960K 8 0 counters 70 37K 37K 166960K 152 0 ioctlops 0 0K 4K 166960K 1638 0 iov 0 0K 16K 166960K 29 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1383 87K 88K 166960K 2033 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 19 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 97K 166960K 964 0 sigio 0 0K 0K 166960K 3 0 proc 79 131K 180K 166960K 1103 0 subproc 72 4K 4K 166960K 234 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 31 0 in_multi 88 6K 7K 166960K 282 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 21 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 685 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 229 169K 186K 166960K 9437 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 44 88K 106K 166960K 2546 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 23 0 NDP 12 0K 2K 166960K 96 0 temp 56 9107K 9214K 166960K 15266 0 kqueue 14 22K 30K 166960K 128 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 97 0 94 1 0 1 1 0 8 0 rtentry 176 325 0 232 6 0 6 6 0 8 0 unpcb 144 256 0 238 1 0 1 1 0 8 0 syncache 336 6 0 6 2 2 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 187 0 182 8 7 1 4 0 8 0 arp 136 64 0 50 1 0 1 1 0 8 0 inpcb 328 715 0 705 10 8 2 7 0 8 1 nd6 152 74 0 51 2 1 1 2 0 8 0 pkpcb 40 3 0 3 2 2 0 1 0 8 0 kcovpl 48 26 0 18 1 0 1 1 0 8 0 ppxss 1192 17 0 17 2 1 1 1 0 8 1 pppxif 1576 3 0 3 2 2 0 1 0 8 0 pfstscr 40 4 0 4 2 2 0 1 0 8 0 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 5 0 3 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 pfanchor 1288 18 0 14 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 57 0 21 1 0 1 1 0 8 0 pfstkey 128 62 0 26 2 0 2 2 0 8 0 pfstate 448 58 0 24 5 0 5 5 0 8 0 pfrule 1360 49 0 43 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1271 0 862 31 0 31 31 0 8 2 art_table 40 1272 0 862 5 0 5 5 0 8 0 art_node 32 325 0 241 1 0 1 1 0 8 0 sysvmsgpl 40 21 0 1 1 0 1 1 0 8 0 semapl 112 17 0 7 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2595 0 1103 94 0 94 94 0 8 0 ffsino 296 2595 0 1103 116 0 116 116 0 8 0 nchpl 144 3495 0 1723 66 0 66 66 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 3168 0 0 176 0 176 176 0 8 0 namei 1024 12159 0 12159 2 1 1 2 0 8 1 percpumem 16 91 0 41 1 0 1 1 0 8 0 kstatmem 264 99 0 72 5 3 2 3 0 8 0 scsiplug 72 18 0 18 2 1 1 1 0 8 1 scxspl 216 11461 0 11461 11 10 1 8 1 8 1 plimitpl 152 104 0 87 1 0 1 1 0 8 0 sigapl 424 1246 0 1196 7 1 6 7 0 8 0 knotepl 120 530 0 0 16 0 16 16 0 8 0 kqueuepl 224 143 0 132 1 0 1 1 0 8 0 pipepl 344 221 0 192 3 0 3 3 0 8 0 fdescpl 528 1229 0 1196 3 0 3 3 0 8 0 filepl 160 5038 0 4819 16 6 10 15 0 8 0 lockfpl 104 175 0 173 1 0 1 1 0 8 0 lockfspl 48 78 0 76 1 0 1 1 0 8 0 sessionpl 144 61 0 52 1 0 1 1 0 8 0 pgrppl 48 91 0 74 1 0 1 1 0 8 0 ucredpl 104 649 0 635 1 0 1 1 0 8 0 zombiepl 144 1196 0 1196 2 1 1 1 0 8 1 processpl 1232 1246 0 1196 5 1 4 5 0 8 0 procpl 664 2055 0 1997 6 0 6 6 0 8 0 sosppl 176 1 0 1 1 1 0 1 0 8 0 sockpl 752 1082 0 1051 14 10 4 10 0 8 0 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 12 0 0 2 0 2 2 0 8 0 mcl12k 12288 7 0 0 1 0 1 1 0 8 0 mcl9k128 9344 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 289 0 0 18 0 18 18 0 8 0 bufpl 280 3333 0 106 231 0 231 231 0 8 0 anonpl 32 6770 0 0 55 0 55 55 0 246 0 amapchunkpl 152 31172 0 30712 36 12 24 31 0 158 6 amappl16 200 2880 0 2850 10 8 2 6 0 8 0 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 626 0 624 1 0 1 1 0 8 0 amappl13 176 155 0 143 1 0 1 1 0 8 0 amappl12 168 1552 0 1521 2 0 2 2 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 66 0 52 1 0 1 1 0 8 0 amappl9 144 267 0 267 1 1 0 1 0 8 0 amappl8 136 170 0 167 1 0 1 1 0 8 0 amappl7 128 183 0 170 1 0 1 1 0 8 0 amappl6 120 324 0 321 1 0 1 1 0 8 0 amappl5 112 97 0 87 1 0 1 1 0 8 0 amappl4 104 345 0 325 1 0 1 1 0 8 0 amappl3 96 5851 0 5740 5 2 3 4 0 8 0 amappl2 88 682 0 617 2 0 2 2 0 8 0 amappl1 80 14333 0 13721 17 3 14 17 0 8 0 amappl 88 8354 0 8199 4 0 4 4 0 92 0 uvmvnodes 80 110 0 0 3 0 3 3 0 8 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 128 259 0 259 3 2 1 1 0 8 1 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1229 0 1196 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1229 0 1196 1 0 1 1 0 8 0 vmmpekpl 168 11060 0 11021 3 0 3 3 0 8 0 vmmpepl 168 83437 0 81499 103 16 87 97 0 357 2 vmsppl 488 1228 0 1196 5 0 5 5 0 8 1 rwobjpl 80 24140 0 23094 26 3 23 26 0 8 0 pdppl 4096 2465 0 2392 145 72 73 87 0 8 0 pvpl 32 15738 0 0 127 0 127 127 0 265 0 pmappl 256 1228 0 1196 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 341 0 85 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834a4dbb) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834e5602,ffffffff83533c69,13f,ffffffff83428f8b) at __assert+0x29 sys/kern/subr_prf.c:-1 tun_clone_destroy(ffff8000015fb000) at tun_clone_destroy+0x38a if_clone_destroy(ffff80002a241690) at if_clone_destroy+0x205 sys/net/if.c:1479 ifioctl(ffff8000016268e8,80206979,ffff80002a241690,ffff800030f94550) at ifioctl+0x59d sys/net/if.c:2160 sys_ioctl(ffff800030f94550,ffff80002a241870,ffff80002a2417c0) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff80002a241870) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a241870) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78c517699cb0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff80002999dff0) 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 end of kernel end trace frame: 0x70d8e2dac8a0, count: 12 ddb{1}> trace x86_ipi_db(ffff80002999dff0) 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 end of kernel end trace frame: 0x70d8e2dac8a0, count: -3