panic: ifpanic: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_fork.c", line 683 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 94227 43572 0 0 0x4000000 0 syz-executor.1 *402738 43572 0 0 0x4000000 1 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 __assert(ffffffff82205e21,ffffffff821f1bbd,2ab,ffffffff821d425c) at __assert+0x2b sys/kern/subr_prf.c:154 proc_trampoline_mp() at proc_trampoline_mp+0x123 end trace frame: 0x0, count: 11 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 ifa_update_broadaddr does not support dynamic length 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 __assert(ffffffff82205e21,ffffffff821f1bbd,2ab,ffffffff821d425c) at __assert+0x2b sys/kern/subr_prf.c:154 proc_trampoline_mp() at proc_trampoline_mp+0x123 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800021bc5310 rbx 0xffff800021bc53c0 rdx 0xffff800020b75658 rcx 0 rax 0 r8 0xffffffff8188b28f kprintf+0x16f r9 0x1 r10 0x25 r11 0x66b17750e813f74b r12 0x3000000008 r13 0xffff800021bc5320 r14 0x104 r15 0x1 rip 0xffffffff81bab4d8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021bc5300 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=402738 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020b75168,0xffffffff8264c6f8 process=0xffff800020addc00 user=0xffff800021bc0000, vmspace=0xfffffd807f00a170 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 70704 398074 83017 0 2 0 syz-executor.0 70704 313395 83017 0 3 0x4000080 fsleep syz-executor.0 43572 411584 11599 0 2 0 syz-executor.1 43572 94227 11599 0 7 0x4000000 syz-executor.1 *43572 402738 11599 0 7 0x4000000 syz-executor.1 11599 150172 98418 0 3 0x82 nanosleep syz-executor.1 1039 29270 0 0 3 0x14200 bored sosplice 83017 394919 98418 0 3 0x82 nanosleep syz-executor.0 98418 166280 36738 0 3 0x82 kqread syz-fuzzer 98418 288496 36738 0 3 0x4000082 thrsleep syz-fuzzer 98418 81338 36738 0 3 0x4000082 thrsleep syz-fuzzer 98418 139790 36738 0 3 0x4000082 thrsleep syz-fuzzer 98418 96517 36738 0 3 0x4000082 thrsleep syz-fuzzer 98418 68387 36738 0 3 0x4000082 thrsleep syz-fuzzer 98418 433030 36738 0 3 0x4000082 thrsleep syz-fuzzer 98418 267988 36738 0 3 0x4000082 thrsleep syz-fuzzer 98418 210406 36738 0 3 0x4000082 thrsleep syz-fuzzer 98418 398950 36738 0 3 0x4000082 thrsleep syz-fuzzer 36738 463431 81674 0 3 0x10008a pause ksh 81674 383875 32617 0 3 0x92 select sshd 34795 172335 1 0 3 0x100083 ttyin getty 32617 253247 1 0 3 0x80 select sshd 46435 182563 53261 74 3 0x100092 bpf pflogd 53261 136836 1 0 3 0x80 netio pflogd 36178 261778 23465 73 3 0x100090 kqread syslogd 23465 37969 1 0 3 0x100082 netio syslogd 77350 250418 1 77 3 0x100090 poll dhclient 68518 137321 1 0 3 0x80 poll dhclient 55612 87699 0 0 2 0x14200 zerothread 326 445560 0 0 3 0x14200 aiodoned aiodoned 70451 409195 0 0 3 0x14200 syncer update 65231 423782 0 0 3 0x14200 cleaner cleaner 95854 403348 0 0 3 0x14200 reaper reaper 15679 189472 0 0 3 0x14200 pgdaemon pagedaemon 78254 521636 0 0 3 0x14200 bored crynlk 64380 36383 0 0 3 0x14200 bored crypto 18604 521532 0 0 3 0x40014200 acpi0 acpi0 18204 259238 0 0 3 0x40014200 idle1 11850 466469 0 0 3 0x14200 bored softnet 90727 482807 0 0 3 0x14200 bored systqmp 93020 269464 0 0 3 0x14200 bored systq 53816 163486 0 0 3 0x40014200 bored softclock 31104 218087 0 0 3 0x40014200 idle0 14007 369304 0 0 3 0x14200 bored smr 1 317542 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 70704 (syz-executor.0) thread 0xffff800020b75168 (313395) exclusive rrwlock inode r = 0 (0xfffffd8061e30b40) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x447 sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x13e sys/ufs/ffs/ffs_vfsops.c:1352 #5 ffs_inode_alloc+0x1cf sys/ufs/ffs/ffs_alloc.c:392 #6 ufs_makeinode+0xaa sys/ufs/ufs/ufs_vnops.c:1832 #7 ufs_create+0x41 sys/ufs/ufs/ufs_vnops.c:152 #8 VOP_CREATE+0xc0 sys/kern/vfs_vops.c:113 #9 vn_open+0x2b4 sys/kern/vfs_vnops.c:125 #10 doopenat+0x28b sys/kern/vfs_syscalls.c:1157 #11 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #11 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #12 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806ac61098) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x447 sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:574 #5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419 #6 namei+0x63c sys/kern/vfs_lookup.c:249 #7 vn_open+0x1c2 sys/kern/vfs_vnops.c:116 #8 doopenat+0x28b sys/kern/vfs_syscalls.c:1157 #9 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #9 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #10 Xsyscall+0x128 Process 43572 (syz-executor.1) thread 0xffff800020b74a00 (94227) exclusive rwlock netlock r = 0 (0xffffffff824e8728) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 in_ioctl_change_ifaddr+0x3f #2 in_ioctl+0x205 sys/netinet/in.c:234 #3 ifioctl+0xb64 sys/net/if.c:2202 #4 sys_ioctl+0x5b9 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8266bc58) #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 9537 6664K 6851K 78643K 11220 0 0 pcb 13 8K 8K 78643K 70 0 0 rtable 90 3K 4K 78643K 358 0 0 ifaddr 54 12K 13K 78643K 118 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1517 0 0 iov 0 0K 16K 78643K 57 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1219 77K 77K 78643K 1501 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 7 0 0 VM map 3 1K 1K 78643K 3 0 0 sem 12 0K 0K 78643K 172 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 25K 78643K 284 0 0 sigio 0 0K 0K 78643K 7 0 0 proc 61 63K 95K 78643K 491 0 0 subproc 32 2K 2K 78643K 51 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 155 0 0 in_multi 23 1K 2K 78643K 44 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 102 450K 450K 78643K 102 0 0 exec 0 0K 1K 78643K 236 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 107 38K 39K 78643K 1906 0 0 UVM aobj 30 2K 2K 78643K 32 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 74 0 0 NDP 11 0K 0K 78643K 32 0 0 temp 164 3559K 3623K 78643K 7593 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 8 0 3 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 27 0 25 1 0 1 1 0 8 0 rtentry 112 62 0 27 2 0 2 2 0 8 0 unpcb 120 175 0 165 1 0 1 1 0 8 0 syncache 264 5 0 5 2 2 0 1 0 8 0 tcpqe 32 69 0 69 1 1 0 1 0 8 0 tcpcb 544 214 0 210 3 2 1 2 0 8 0 inpcb 280 577 0 569 3 1 2 3 0 8 1 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 6 0 6 1 1 0 1 0 8 0 nd6 48 8 0 6 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 ppxss 1128 12 0 12 2 1 1 1 0 8 1 pffrag 232 6 0 6 2 1 1 1 0 482 1 pffrnode 88 6 0 6 2 1 1 1 0 8 1 pffrent 40 227 0 227 2 1 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 27 0 4 1 0 1 1 0 8 0 pfstkey 112 27 0 4 1 0 1 1 0 8 0 pfstate 328 27 0 4 2 0 2 2 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 256 298 0 124 15 4 11 15 0 8 0 art_table 32 299 0 124 2 0 2 2 0 8 0 art_node 16 61 0 29 1 0 1 1 0 8 0 sysvmsgpl 40 18 0 14 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 170 0 160 1 0 1 1 0 8 0 shmpl 112 30 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1863 0 450 46 0 46 46 0 8 0 ffsino 272 1863 0 450 95 0 95 95 0 8 0 nchpl 144 2467 0 857 61 0 61 61 0 8 0 uvmvnodes 72 2084 0 0 38 0 38 38 0 8 0 vnodes 208 2084 0 0 110 0 110 110 0 8 0 namei 1024 7526 0 7526 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 1 0 0 1 0 1 1 0 8 0 scxspl 192 6760 0 6760 8 6 2 7 0 8 2 plimitpl 152 32 0 24 1 0 1 1 0 8 0 sigapl 432 481 0 465 3 1 2 3 0 8 0 futexpl 56 7138 0 7137 1 0 1 1 0 8 0 knotepl 112 99 0 80 1 0 1 1 0 8 0 kqueuepl 104 76 0 74 1 0 1 1 0 8 0 pipepl 112 428 0 409 3 1 2 2 0 8 1 fdescpl 488 482 0 465 3 0 3 3 0 8 0 filepl 152 3999 0 3897 7 1 6 7 0 8 2 lockfpl 104 88 0 86 1 0 1 1 0 8 0 lockfspl 48 34 0 32 1 0 1 1 0 8 0 sessionpl 112 19 0 8 1 0 1 1 0 8 0 pgrppl 48 23 0 12 1 0 1 1 0 8 0 ucredpl 96 693 0 684 1 0 1 1 0 8 0 zombiepl 144 466 0 466 1 0 1 1 0 8 1 processpl 896 499 0 466 4 0 4 4 0 8 0 procpl 632 1097 0 1052 5 0 5 5 0 8 0 srpgc 64 4 0 4 1 1 0 1 0 8 0 sosppl 128 3 0 3 2 1 1 1 0 8 1 sockpl 384 784 0 764 6 2 4 6 0 8 2 mcl64k 65536 9 0 0 2 0 2 2 0 8 0 mcl12k 12288 4 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 9 0 0 2 0 2 2 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 150 0 0 18 0 18 18 0 8 0 mtagpl 80 6 0 0 1 0 1 1 0 8 0 mbufpl 256 341 0 0 20 0 20 20 0 8 0 bufpl 256 6719 0 1314 338 0 338 338 0 8 0 anonpl 16 68211 0 48980 98 10 88 97 0 124 7 amapchunkpl 152 2754 0 2615 10 4 6 9 0 158 0 amappl16 192 2525 0 1405 68 11 57 68 0 8 1 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 230 0 226 1 0 1 1 0 8 0 amappl13 168 1 0 1 1 1 0 1 0 8 0 amappl12 160 48 0 45 1 0 1 1 0 8 0 amappl11 152 55 0 40 1 0 1 1 0 8 0 amappl10 144 14 0 10 1 0 1 1 0 8 0 amappl9 136 630 0 624 1 0 1 1 0 8 0 amappl8 128 186 0 163 1 0 1 1 0 8 0 amappl7 120 46 0 41 1 0 1 1 0 8 0 amappl6 112 74 0 64 1 0 1 1 0 8 0 amappl5 104 186 0 169 1 0 1 1 0 8 0 amappl4 96 505 0 474 1 0 1 1 0 8 0 amappl3 88 549 0 537 1 0 1 1 0 8 0 amappl2 80 2879 0 2798 3 1 2 3 0 8 0 amappl1 72 20598 0 20139 25 14 11 20 0 8 0 amappl 80 1363 0 1320 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 31 0 2 1 0 1 1 0 8 0 uaddrrnd 24 483 0 465 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 483 0 465 1 0 1 1 0 8 0 vmmpekpl 168 8090 0 8057 2 0 2 2 0 8 0 vmmpepl 168 67390 0 65023 154 13 141 142 0 357 38 vmsppl 368 481 0 465 2 0 2 2 0 8 0 pdppl 4096 973 0 931 6 0 6 6 0 8 0 pvpl 32 208398 0 186140 221 9 212 221 0 265 26 pmappl 232 482 0 465 2 0 2 2 0 8 1 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 511 0 9 15 0 15 15 0 8 0