login: panic: kernel diagnostic assertion "sc->sc_dev == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/net/if_tun.c", line 303 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *224905 1909 0 0 0x4000000 0K syz-executor.3 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8259e6a9) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff82611ec2,ffffffff8265a184,12f,ffffffff826247dc) at __assert+0x25 sys/kern/subr_prf.c:161 tun_clone_destroy(ffff800000d5c800) at tun_clone_destroy+0x278 sys/net/if_tun.c:303 if_clone_destroy(ffff80002e53d2f0) at if_clone_destroy+0x132 sys/net/if.c:1230 soo_ioctl(fffffd806973dad0,80206979,ffff80002e53d2f0,ffff800029623260) at soo_ioctl+0x26c sys_ioctl(ffff800029623260,ffff80002e53d408,ffff80002e53d450) at sys_ioctl+0x4a2 syscall(ffff80002e53d4d0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e53d4d0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x62abdba6ed0, 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 303 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8259e6a9) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff82611ec2,ffffffff8265a184,12f,ffffffff826247dc) at __assert+0x25 sys/kern/subr_prf.c:161 tun_clone_destroy(ffff800000d5c800) at tun_clone_destroy+0x278 sys/net/if_tun.c:303 if_clone_destroy(ffff80002e53d2f0) at if_clone_destroy+0x132 sys/net/if.c:1230 soo_ioctl(fffffd806973dad0,80206979,ffff80002e53d2f0,ffff800029623260) at soo_ioctl+0x26c sys_ioctl(ffff800029623260,ffff80002e53d408,ffff80002e53d450) at sys_ioctl+0x4a2 syscall(ffff80002e53d4d0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e53d4d0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x62abdba6ed0, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e53d100 rbx 0xffffffff82920bb7 cpu_info_full_primary+0x2bb7 rdx 0 rcx 0 rax 0xffff800029623260 r8 0 r9 0x8080808080808080 r10 0x9cd2ef3c5fe9631f r11 0x84a3adaab0f1bd4 r12 0xffffffff829209b8 cpu_info_full_primary+0x29b8 r13 0 r14 0 r15 0x1 rip 0xffffffff823865d8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e53d0f0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.3) pid=224905 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=85, nice=20 forw=0xffffffffffffffff, list=0xffff8000296237a0,0xffff800029622010 process=0xffff80002e4c14f0 user=0xffff80002e538000, vmspace=0xfffffd8066387a28 estcpu=35, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 79542 278211 76771 0 2 0 syz-executor.6 1909 430118 42476 0 2 0 syz-executor.3 * 1909 224905 42476 0 7 0x4000000 syz-executor.3 1909 345346 42476 0 3 0x4000080 fsleep syz-executor.3 87321 301213 89966 0 2 0 syz-executor.2 87321 219757 89966 0 3 0x4000080 fsleep syz-executor.2 67333 512574 45419 0 2 0 syz-executor.0 67333 471111 45419 0 3 0x4000080 fsleep syz-executor.0 67333 502560 45419 0 3 0x4000080 fsleep syz-executor.0 53484 32024 95391 0 2 0 syz-executor.5 53484 117556 95391 0 3 0x4000080 fsleep syz-executor.5 276 397499 47384 0 2 0x480 syz-executor.4 276 364457 47384 0 3 0x4000080 fsleep syz-executor.4 63684 486011 39230 0 2 0 syz-executor.1 63684 233664 39230 0 3 0x4000080 kqread syz-executor.1 63684 152567 39230 0 3 0x4000080 fsleep syz-executor.1 76771 379114 32944 0 3 0x82 nanoslp syz-executor.6 47384 484168 32944 0 3 0x82 nanoslp syz-executor.4 56236 57087 32944 0 2 0x2 syz-executor.7 64216 254176 1 0 3 0x100083 ttyin getty 39230 78555 32944 0 3 0x82 nanoslp syz-executor.1 26843 404897 0 0 3 0x14200 acct acct 45419 217865 32944 0 3 0x82 nanoslp syz-executor.0 89966 451771 32944 0 3 0x82 nanoslp syz-executor.2 42476 164101 32944 0 2 0x482 syz-executor.3 95391 227832 32944 0 3 0x82 nanoslp syz-executor.5 17460 138761 0 0 3 0x14280 nfsidl nfsio 27273 447515 0 0 3 0x14280 nfsidl nfsio 64639 462572 0 0 3 0x14280 nfsidl nfsio 38111 416898 0 0 3 0x14280 nfsidl nfsio 93395 38128 0 0 3 0x14280 nfsidl nfsio 56403 196445 0 0 3 0x14280 nfsidl nfsio 85910 269756 0 0 3 0x14280 nfsidl nfsio 92543 166478 0 0 3 0x14280 nfsidl nfsio 30179 229735 0 0 3 0x14280 nfsidl nfsio 26124 326503 0 0 3 0x14280 nfsidl nfsio 35727 16239 0 0 3 0x14280 nfsidl nfsio 57769 453992 0 0 3 0x14280 nfsidl nfsio 5160 276286 0 0 3 0x14280 nfsidl nfsio 58646 371131 0 0 3 0x14280 nfsidl nfsio 32593 110343 0 0 3 0x14280 nfsidl nfsio 44681 522111 0 0 3 0x14280 nfsidl nfsio 61362 307130 0 0 3 0x14280 nfsidl nfsio 53173 126561 0 0 3 0x14280 nfsidl nfsio 47105 384086 0 0 3 0x14280 nfsidl nfsio 74098 34388 0 0 3 0x14280 nfsidl nfsio 72273 252820 0 0 3 0x14200 bored sosplice 32944 292155 18384 0 3 0x82 thrsleep syz-fuzzer 32944 251965 18384 0 3 0x4000082 nanoslp syz-fuzzer 32944 325979 18384 0 3 0x4000082 thrsleep syz-fuzzer 32944 252293 18384 0 3 0x4000082 thrsleep syz-fuzzer 32944 508824 18384 0 3 0x4000082 thrsleep syz-fuzzer 32944 208746 18384 0 3 0x4000082 thrsleep syz-fuzzer 32944 272350 18384 0 3 0x4000082 kqread syz-fuzzer 32944 505234 18384 0 3 0x4000082 thrsleep syz-fuzzer 32944 461600 18384 0 2 0x4000482 syz-fuzzer 18384 486178 42675 0 3 0x10008a sigsusp ksh 42675 338914 9466 0 3 0x9a kqread sshd 9466 498057 1 0 3 0x88 kqread sshd 31716 372326 35617 74 3 0x1100092 bpf pflogd 35617 90667 1 0 3 0x80 netio pflogd 5683 367502 74044 73 3 0x1100090 kqread syslogd 74044 300682 1 0 3 0x100082 netio syslogd 66306 178580 1 0 3 0x100080 kqread resolvd 88883 511091 35093 77 2 0x100092 dhcpleased 6271 205349 35093 77 3 0x100092 kqread dhcpleased 35093 119349 1 0 3 0x80 kqread dhcpleased 9355 112641 0 0 3 0x14200 bored smr 42425 355447 0 0 2 0x14200 zerothread 14181 143076 0 0 3 0x14200 aiodoned aiodoned 20991 140473 0 0 3 0x14200 syncer update 19736 283904 0 0 3 0x14200 cleaner cleaner 60251 72054 0 0 3 0x14200 reaper reaper 68123 404996 0 0 3 0x14200 pgdaemon pagedaemon 70613 289135 0 0 3 0x14200 bored viomb 21987 489350 0 0 3 0x40014200 acpi0 acpi0 11359 259437 0 0 7 0x40014200 idle1 80484 87497 0 0 3 0x14200 bored softnet 28685 35200 0 0 3 0x14200 bored softnet 93114 409152 0 0 3 0x14200 bored softnet 41687 450328 0 0 3 0x14200 bored softnet 13153 136834 0 0 3 0x14200 bored systqmp 8277 138390 0 0 3 0x14200 bored systq 24110 166480 0 0 3 0x40014200 bored softclock 53247 33434 0 0 3 0x40014200 idle0 1 34813 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10209 6510K 7445K 78643K 65828 0 pcb 13 20K 22K 78643K 5148 0 rtable 65 10K 16K 78643K 25673 0 ifaddr 49 19K 28K 78643K 2186 0 sysctl 3 1K 1K 78643K 3 0 counters 42 33K 36K 78643K 776 0 ioctlops 0 0K 4K 78643K 7434 0 iov 0 0K 24K 78643K 2717 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1516 95K 96K 78643K 15306 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 291 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 6726 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 17 61K 93K 78643K 30470 0 sigio 0 0K 0K 78643K 478 0 proc 74 91K 116K 78643K 4334 0 subproc 104 6K 6K 78643K 1378 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 3300 0 in_multi 1 0K 7K 78643K 1885 0 ether_multi 1 0K 0K 78643K 311 0 mrt 12 0K 0K 78643K 371 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 253 1129K 1129K 78643K 253 0 exec 0 0K 2K 78643K 7665 0 pfkey data 0 0K 0K 78643K 15 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 747 2109K 2113K 78643K 164594 0 UVM aobj 131 5K 6K 78643K 166 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 833 0 NDP 7 0K 1K 78643K 624 0 temp 148 4797K 5834K 78643K 344808 0 kqueue 13 20K 24K 78643K 1738 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 27412 0 27404 121 118 3 7 0 8 2 rtentry 112 1794 0 1787 4 3 1 4 0 8 0 unpcb 144 13643 0 13627 156 152 4 8 0 8 3 syncache 296 128 0 128 16 16 0 1 0 8 0 tcpqe 32 81 0 81 10 10 0 1 0 8 0 tcpcb 736 21214 0 21171 347 334 13 29 0 8 9 arp 120 301 0 299 1 0 1 1 0 8 0 inpcb 320 50724 0 50683 374 366 8 20 0 8 4 nd6 48 374 0 374 2 1 1 1 0 8 1 pkpcb 40 162 0 162 12 12 0 1 0 8 0 kcovpl 48 106 0 98 1 0 1 1 0 8 0 ppxss 1256 166 0 166 20 20 0 1 0 8 0 pfstscr 40 7 0 7 3 3 0 1 0 8 0 pffrag 232 56 0 56 8 8 0 1 0 482 0 pffrnode 88 56 0 56 8 8 0 1 0 8 0 pffrent 40 306 0 306 12 12 0 1 0 8 0 pfosfp 40 1470 0 1043 5 0 5 5 0 8 0 pfosfpen 112 1470 0 752 21 0 21 21 0 8 0 pfrktable 1344 346 0 334 4 3 1 2 0 8 0 pftag 88 4 0 3 1 0 1 1 0 8 0 pfstitem 24 47 0 45 1 0 1 1 0 8 0 pfstkey 120 61 0 59 1 0 1 1 0 8 0 pfstate 336 54 0 52 3 2 1 3 0 8 0 pfrule 1360 305 0 271 5 2 3 3 0 8 0 rttmr 136 52 0 52 13 13 0 1 0 8 0 art_heap8 4096 4 0 3 3 2 1 3 0 8 0 art_heap4 256 7381 0 7374 71 66 5 29 0 8 4 art_table 32 7385 0 7377 5 4 1 4 0 8 0 art_node 16 1781 0 1778 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 4 1 0 1 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 6724 0 6714 1 0 1 1 0 8 0 shmpl 112 163 0 35 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 36843 0 35332 96 0 96 96 0 8 0 ffsino 272 36843 0 35332 102 0 102 102 0 8 0 nchpl 144 73621 0 71976 63 0 63 63 0 8 0 uvmvnodes 80 6415 0 0 131 0 131 131 0 8 0 vnodes 224 6415 0 0 378 0 378 378 0 8 0 namei 1024 254292 0 254292 6 5 1 2 0 8 1 percpumem 16 400 0 367 1 0 1 1 0 8 0 vcpupl 2048 372 0 0 47 0 47 47 0 8 0 vmpool 568 438 0 66 27 0 27 27 0 8 0 pfiaddrpl 120 111 0 89 2 1 1 1 0 8 0 kstatmem 264 748 0 734 15 13 2 3 0 8 0 scsiplug 72 40 0 40 11 11 0 1 0 8 0 scxspl 216 216423 0 216423 21 20 1 8 0 8 1 plimitpl 152 3208 0 3193 1 0 1 1 0 8 0 sigapl 424 30742 0 30673 12 4 8 8 0 8 0 futexpl 64 325225 0 325218 4 3 1 1 0 8 0 knotepl 120 1047 0 0 10 0 10 10 0 8 0 kqueuepl 224 9780 0 9706 170 165 5 11 0 8 0 pipepl 336 10432 0 10404 215 208 7 11 0 8 4 fdescpl 496 30566 0 30536 5 1 4 5 0 8 0 filepl 152 230403 0 230056 280 263 17 23 0 8 3 lockfpl 104 6051 0 6049 11 10 1 3 0 8 0 lockfspl 48 1870 0 1868 1 0 1 1 0 8 0 sessionpl 144 125 0 108 1 0 1 1 0 8 0 pgrppl 48 304 0 287 1 0 1 1 0 8 0 ucredpl 104 24199 0 24184 1 0 1 1 0 8 0 zombiepl 144 30673 0 30673 2 1 1 1 0 8 1 processpl 1064 30742 0 30673 6 1 5 5 0 8 0 procpl 672 75561 0 75475 33 25 8 9 0 8 0 srpgc 96 201 0 201 35 34 1 1 0 8 1 sosppl 168 150 0 150 29 29 0 1 0 8 0 sockpl 504 92110 0 92041 1233 1220 13 37 0 8 4 mcl64k 65536 10 0 0 2 0 2 2 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 8 0 0 1 0 1 1 0 8 0 mcl4k 4096 12 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 413 0 0 22 1 21 22 0 8 0 mtagpl 96 1552 0 0 26 0 26 26 0 8 0 mbufpl 256 8039 0 0 473 0 473 473 0 8 0 bufpl 288 47081 0 40626 462 0 462 462 0 8 0 anonpl 24 5837511 0 5813433 425 266 159 166 0 186 3 amapchunkpl 152 472410 0 471240 107 60 47 48 0 158 0 amappl16 200 94965 0 94163 202 157 45 60 0 8 2 amappl15 192 4143 0 4141 1 0 1 1 0 8 0 amappl14 184 3234 0 3227 2 1 1 1 0 8 0 amappl13 176 5471 0 5467 1 0 1 1 0 8 0 amappl12 168 7294 0 7285 1 0 1 1 0 8 0 amappl11 160 5641 0 5620 2 0 2 2 0 8 0 amappl10 152 1113 0 1108 1 0 1 1 0 8 0 amappl9 144 3693 0 3689 1 0 1 1 0 8 0 amappl8 136 4895 0 4752 5 0 5 5 0 8 0 amappl7 128 2848 0 2835 1 0 1 1 0 8 0 amappl6 120 4056 0 4029 2 1 1 2 0 8 0 amappl5 112 21462 0 21445 1 0 1 1 0 8 0 amappl4 104 13342 0 13305 2 0 2 2 0 8 0 amappl3 96 93522 0 93452 2 0 2 2 0 8 0 amappl2 88 42102 0 42028 3 0 3 3 0 8 0 amappl1 80 712050 0 711359 30 15 15 20 0 8 0 amappl 88 161809 0 161472 8 0 8 8 0 92 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 128 253 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 72 165 0 35 3 0 3 3 0 8 0 uaddrrnd 24 31004 0 30602 3 0 3 3 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 31004 0 30602 3 0 3 3 0 8 0 vmmpekpl 168 207540 0 207436 6 0 6 6 0 8 0 vmmpepl 168 2972521 0 2968740 394 217 177 181 0 357 3 vmsppl 368 31003 0 30602 39 2 37 37 0 8 0 rwobjpl 56 708251 0 699602 148 25 123 123 0 8 0 pdppl 4096 62015 0 61576 1229 788 441 441 0 8 2 pvpl 32 11466716 0 11444453 589 387 202 258 0 265 7 pmappl 248 31003 0 30602 28 2 26 26 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 4385 0 2652 51 0 51 51 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8259e6a9) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff82611ec2,ffffffff8265a184,12f,ffffffff826247dc) at __assert+0x25 sys/kern/subr_prf.c:161 tun_clone_destroy(ffff800000d5c800) at tun_clone_destroy+0x278 sys/net/if_tun.c:303 if_clone_destroy(ffff80002e53d2f0) at if_clone_destroy+0x132 sys/net/if.c:1230 soo_ioctl(fffffd806973dad0,80206979,ffff80002e53d2f0,ffff800029623260) at soo_ioctl+0x26c sys_ioctl(ffff800029623260,ffff80002e53d408,ffff80002e53d450) at sys_ioctl+0x4a2 syscall(ffff80002e53d4d0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e53d4d0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x62abdba6ed0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020de8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020de8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800020de8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020de8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: -5