panic: kernel diagnostic assertion "sc->sc_dev == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/net/if_tun.c", line 322 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *415774 99968 0 0x2 0 0K ifconfig 143745 82857 0 0x14000 0x200 1 reaper db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff83437f15) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833e6541,ffffffff833b894d,142,ffffffff833c30fd) at __assert+0x29 tun_clone_destroy(ffff800001459000) at tun_clone_destroy+0x38a sys/net/if_tun.c:322 if_clone_destroy(ffff80002a42e860) at if_clone_destroy+0x1d7 sys/net/if.c:1383 ifioctl(ffff800001442570,80206979,ffff80002a42e860,ffff80002a4431e8) at ifioctl+0x5c5 sys_ioctl(ffff80002a4431e8,ffff80002a42ea40,ffff80002a42e990) at sys_ioctl+0x5c3 syscall(ffff80002a42ea40) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a42ea40) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x741297e0db20, 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 322 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff83437f15) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833e6541,ffffffff833b894d,142,ffffffff833c30fd) at __assert+0x29 tun_clone_destroy(ffff800001459000) at tun_clone_destroy+0x38a sys/net/if_tun.c:322 if_clone_destroy(ffff80002a42e860) at if_clone_destroy+0x1d7 sys/net/if.c:1383 ifioctl(ffff800001442570,80206979,ffff80002a42e860,ffff80002a4431e8) at ifioctl+0x5c5 sys_ioctl(ffff80002a4431e8,ffff80002a42ea40,ffff80002a42e990) at sys_ioctl+0x5c3 syscall(ffff80002a42ea40) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a42ea40) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x741297e0db20, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a42e610 rbx 0xffffffff83798dc7 cpu_info_full_primary+0x2dc7 rdx 0 rcx 0xffff80002a4431e8 rax 0xffffffff83797ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xc47a1f7583eb35e6 r11 0x8c2ca434817f3878 r12 0xffffffff83798bc8 cpu_info_full_primary+0x2bc8 r13 0 r14 0 r15 0x1 rip 0xffffffff824f07e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a42e600 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (ifconfig) tid=415774 pid=99968 tcnt=1 stat=onproc flags process=2 proc=0 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffc008,0xffff80002a443708 process=0xffff80002a49b920 user=0xffff80002a429000, vmspace=0xfffffd807eb8b720 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 14676 50372 91326 0 3 0x2 clonelk ifconfig 91326 200517 35670 0 3 0x10008a sigsusp sh *99968 415774 66452 0 7 0x2 ifconfig 66452 247278 38862 0 3 0x10008a sigsusp sh 35670 81172 11046 0 3 0x82 wait syz-executor 38862 307890 11046 0 3 0x82 wait syz-executor 5687 319802 0 0 3 0x14280 nfsidl nfsio 78845 203934 0 0 3 0x14280 nfsidl nfsio 58757 112679 0 0 3 0x14280 nfsidl nfsio 16078 434792 0 0 3 0x14280 nfsidl nfsio 6917 264522 0 0 3 0x14280 nfsidl nfsio 26784 417227 0 0 3 0x14280 nfsidl nfsio 98974 133249 0 0 3 0x14280 nfsidl nfsio 14810 404553 0 0 3 0x14280 nfsidl nfsio 29331 109434 0 0 3 0x14280 nfsidl nfsio 85642 428380 0 0 3 0x14280 nfsidl nfsio 83215 59346 0 0 3 0x14280 nfsidl nfsio 23592 216552 0 0 3 0x14280 nfsidl nfsio 66988 285944 0 0 3 0x14280 nfsidl nfsio 90969 256529 0 0 3 0x14280 nfsidl nfsio 50463 305463 0 0 3 0x14280 nfsidl nfsio 1593 88120 0 0 3 0x14280 nfsidl nfsio 81754 183242 0 0 3 0x14280 nfsidl nfsio 29520 319531 0 0 3 0x14280 nfsidl nfsio 94785 128324 0 0 3 0x14280 nfsidl nfsio 47519 166942 0 0 3 0x14280 nfsidl nfsio 35170 425554 0 0 3 0x14200 bored sosplice 39273 223870 11046 0 3 0x82 piperd syz-executor 39686 376900 11046 0 3 0x82 piperd syz-executor 92933 466911 11046 0 3 0x82 piperd syz-executor 11046 54073 96080 0 3 0x82 wait syz-executor 96080 193552 23687 0 3 0x10008a sigsusp ksh 23687 465029 54260 0 3 0x98 kqread sshd-session 54260 458479 27366 0 3 0x92 kqread sshd-session 49757 17871 1 0 3 0x100083 ttyin getty 27366 342660 1 0 3 0x88 kqread sshd 54774 324699 15318 74 3 0x1100092 bpf pflogd 15318 427730 1 0 3 0x80 sbwait pflogd 22325 83717 93157 73 3 0x1100090 kqread syslogd 93157 11111 1 0 3 0x100082 sbwait syslogd 89074 281163 1 0 3 0x100080 kqread resolvd 10526 49913 25616 77 2 0x100012 dhcpleased 96713 133005 25616 77 2 0x100012 dhcpleased 25616 207574 1 0 3 0x80 kqread dhcpleased 38962 301754 0 0 3 0x14200 bored smr 45835 93940 0 0 2 0x14200 zerothread 78724 52261 0 0 3 0x14200 aiodoned aiodoned 78570 330439 0 0 3 0x14200 syncer update 93414 424876 0 0 3 0x14200 cleaner cleaner 82857 143745 0 0 7 0x14200 reaper 55092 360587 0 0 3 0x14200 pgdaemon pagedaemon 92425 83304 0 0 3 0x14200 bored viomb 70323 422051 0 0 3 0x40014200 acpi0 acpi0 84152 510995 0 0 3 0x40014200 idle1 54269 187213 0 0 3 0x14200 bored softnet3 74194 484669 0 0 3 0x14200 bored softnet2 31361 173166 0 0 3 0x14200 bored softnet1 39124 439132 0 0 2 0x14200 softnet0 78488 255659 0 0 3 0x14200 bored systqmp 13122 14589 0 0 3 0x14200 bored systq 89456 319072 0 0 3 0x14200 tmoslp softclockmp 86782 84767 0 0 3 0x40014200 tmoslp softclock 80739 231029 0 0 3 0x40014200 idle0 1 403527 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 99968 (ifconfig) thread 0xffff80002a4431e8 (415774) exclusive rwlock clonelk r = 0 (0xffffffff83820328) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 if_clone_destroy+0x67 #3 ifioctl+0x5c5 #4 sys_ioctl+0x5c3 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839ad518) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 __mp_acquire_count+0x58 #2 mi_switch+0x4b7 sys/kern/sched_bsd.c:441 #3 sleep_finish+0x24f sys/kern/kern_synch.c:414 #4 rw_do_enter_write+0x1de sys/kern/kern_rwlock.c:292 #5 if_clone_destroy+0x67 #6 ifioctl+0x5c5 #7 sys_ioctl+0x5c3 #8 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 Process 39124 (softnet0) thread 0xffff8000ffffea20 (439132) shared rwlock softnet0 r = 0 (0xffff80000002c070) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10180 11011K 11286K 166960K 11516 0 pcb 17 12K 12K 166960K 46 0 rtable 149 4K 7K 166960K 368 0 pf 26 16K 18K 166960K 48 0 ifaddr 27 4K 7K 166960K 47 0 ifgroup 39 1K 2K 166960K 57 0 sysctl 1 1K 1K 166960K 1 0 counters 56 35K 36K 166960K 66 0 ioctlops 0 0K 4K 166960K 1499 0 iov 0 0K 12K 166960K 11 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1402 88K 89K 166960K 1637 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 7 0K 0K 166960K 8 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 11 37K 89K 166960K 298 0 sigio 0 0K 0K 166960K 5 0 proc 86 116K 128K 166960K 566 0 subproc 45 2K 4K 166960K 109 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 12 0 in_multi 55 4K 7K 166960K 103 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 1 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 521 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 150 46K 82K 166960K 4310 0 UVM aobj 7 2K 2K 166960K 7 0 pinsyscall 36 72K 100K 166960K 1419 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 7 0 NDP 8 0K 2K 166960K 29 0 temp 26 8634K 8702K 166960K 7213 0 kqueue 13 20K 30K 166960K 51 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 45 0 42 1 0 1 1 0 8 0 rtentry 112 111 0 45 4 0 4 4 0 8 0 unpcb 144 101 0 84 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 808 46 0 42 1 0 1 1 0 8 0 arp 120 18 0 8 1 0 1 1 0 8 0 inpcb 376 189 0 180 2 0 2 2 0 8 1 nd6 136 24 0 12 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 12 0 7 1 0 1 1 0 8 0 ppxss 1168 1 0 1 1 1 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 2 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 23 0 13 1 0 1 1 0 8 0 pfstkey 128 23 0 13 1 0 1 1 0 8 0 pfstate 376 23 0 13 3 0 3 3 0 8 0 pfrule 1344 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 256 452 0 176 29 1 28 29 0 8 6 art_table 32 453 0 176 4 0 4 4 0 8 0 art_node 16 110 0 50 1 0 1 1 0 8 0 semapl 112 6 0 1 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1898 0 393 95 0 95 95 0 8 0 ffsino 280 1898 0 393 109 0 109 109 0 8 0 nchpl 144 2324 0 1795 63 33 30 63 0 8 7 uvmvnodes 80 2151 0 0 44 0 44 44 0 8 0 vnodes 216 2151 0 0 120 0 120 120 0 8 0 namei 1024 8132 0 8132 1 0 1 1 0 8 1 percpumem 16 47 0 5 1 0 1 1 0 8 0 kstatmem 264 26 0 10 2 0 2 2 0 8 0 scxspl 216 7114 0 7114 5 3 2 3 1 8 2 plimitpl 152 62 0 45 1 0 1 1 0 8 0 sigapl 424 619 0 552 8 0 8 8 0 8 0 futexpl 64 2515 0 2515 1 0 1 1 0 8 1 knotepl 120 311 0 0 10 0 10 10 0 8 0 kqueuepl 216 62 0 53 1 0 1 1 0 8 0 pipepl 328 134 0 107 3 0 3 3 0 8 0 fdescpl 504 580 0 555 5 0 5 5 0 8 1 filepl 152 3087 0 2918 12 1 11 12 0 8 2 lockfpl 104 308 0 306 2 1 1 2 0 8 0 lockfspl 48 89 0 87 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 41 0 24 1 0 1 1 0 8 0 ucredpl 104 450 0 437 1 0 1 1 0 8 0 zombiepl 144 555 0 552 1 0 1 1 0 8 0 processpl 1168 619 0 552 6 0 6 6 0 8 0 procpl 648 875 0 808 7 0 7 7 0 8 0 srpgc 96 4 0 4 2 1 1 1 0 8 1 sosppl 168 2 0 2 1 1 0 1 0 8 0 sockpl 688 337 0 308 4 0 4 4 0 8 1 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 117 0 0 15 0 15 15 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mtagpl 96 7 0 0 1 0 1 1 0 8 0 mbufpl 256 206 0 0 13 0 13 13 0 8 0 bufpl 280 2611 0 130 178 0 178 178 0 8 0 anonpl 24 123508 0 120547 49 2 47 48 0 184 16 amapchunkpl 152 13365 0 13097 26 1 25 26 0 158 8 amappl16 200 2581 0 2567 18 8 10 15 0 8 8 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 115 0 103 1 0 1 1 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 1247 0 1222 3 1 2 2 0 8 0 amappl11 160 70 0 56 1 0 1 1 0 8 0 amappl10 152 7 0 7 1 1 0 1 0 8 0 amappl9 144 246 0 246 1 1 0 1 0 8 0 amappl8 136 24 0 21 1 0 1 1 0 8 0 amappl7 128 110 0 97 1 0 1 1 0 8 0 amappl6 120 186 0 179 1 0 1 1 0 8 0 amappl5 112 125 0 114 1 0 1 1 0 8 0 amappl4 104 320 0 300 1 0 1 1 0 8 0 amappl3 96 2291 0 2229 4 0 4 4 0 8 1 amappl2 88 666 0 600 2 0 2 2 0 8 0 amappl1 80 8591 0 8035 14 1 13 14 0 8 0 amappl 88 3916 0 3819 5 0 5 5 0 92 1 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 580 0 555 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 580 0 555 1 0 1 1 0 8 0 vmmpekpl 168 6679 0 6623 3 0 3 3 0 8 0 vmmpepl 168 42537 0 41089 96 1 95 96 0 357 16 vmsppl 456 579 0 555 5 0 5 5 0 8 1 rwobjpl 64 17291 0 14295 51 1 50 51 0 8 0 pdppl 4096 1168 0 1110 104 32 72 84 0 8 14 pvpl 32 16473 0 0 134 1 133 133 0 265 0 pmappl 248 579 0 555 3 0 3 3 0 8 1 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 284 0 37 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:437 panic(ffffffff83437f15) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833e6541,ffffffff833b894d,142,ffffffff833c30fd) at __assert+0x29 tun_clone_destroy(ffff800001459000) at tun_clone_destroy+0x38a sys/net/if_tun.c:322 if_clone_destroy(ffff80002a42e860) at if_clone_destroy+0x1d7 sys/net/if.c:1383 ifioctl(ffff800001442570,80206979,ffff80002a42e860,ffff80002a4431e8) at ifioctl+0x5c5 sys_ioctl(ffff80002a4431e8,ffff80002a42ea40,ffff80002a42e990) at sys_ioctl+0x5c3 syscall(ffff80002a42ea40) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a42ea40) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x741297e0db20, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff800029aabff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff839ad310) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839ad310) at __mp_lock+0x192 sys/kern/kern_lock.c:144 reaper(ffff8000ffffd6d0) at reaper+0x24b sys/kern/kern_exit.c:478 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800029aabff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff839ad310) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839ad310) at __mp_lock+0x192 sys/kern/kern_lock.c:144 reaper(ffff8000ffffd6d0) at reaper+0x24b sys/kern/kern_exit.c:478 end trace frame: 0x0, count: -5