panic: kernel diagnostic assertion "la != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/netinet/if_ether.c", line 342 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 353181 30206 0 0 0 0 syz-executor.0 *414026 30206 0 0 0x4000000 1K syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:212 __assert(ffffffff81f9f98e,ffffffff81f9d06c,156,ffffffff81f7a131) at __assert+0x2e sys/kern/subr_prf.c:159 arpresolve(ffff8000001732a8,fffffd80685a0318,fffffd8064b82600,fffffd806f6f24e0,ffff800022e451a8) at arpresolve+0x839 sys/netinet/if_ether.c:342 ether_resolve(ffff8000001732a8,fffffd8064b82600,fffffd806f6f24e0,fffffd80685a0318,ffff800022e451a8) at ether_resolve+0x20d sys/net/if_ethersubr.c:211 ether_output(ffff8000001732a8,fffffd8064b82600,fffffd806f6f24e0,fffffd80685a0318) at ether_output+0x47 ether_encap sys/net/if_ethersubr.c:307 [inline] ether_output(ffff8000001732a8,fffffd8064b82600,fffffd806f6f24e0,fffffd80685a0318) at ether_output+0x47 sys/net/if_ethersubr.c:336 ip_output(fffffd8064b82600,0,fffffd806f6f24d0,800,0,fffffd806f6f2460) at ip_output+0x1167 sys/netinet/ip_output.c:470 tcp_output(ffff8000009a9aa0) at tcp_output+0x26d1 sys/netinet/tcp_output.c:1040 tcp_usrreq(fffffd806f6f3300,4,0,fffffd8075876c00,0,ffff800020b9a4c8) at tcp_usrreq+0x23b sys_connect(ffff800020b9a4c8,ffff800022e45618,ffff800022e45680) at sys_connect+0x3dc sys/kern/uipc_syscalls.c:388 syscall(ffff800022e456f0) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800022e456f0) at syscall+0x552 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,fffffffffffffee1,0,3,923641bb010) at Xsyscall+0x128 end of kernel end trace frame: 0x92595ef37b0, count: 3 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 kernel diagnostic assertion "la != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/netinet/if_ether.c", line 342 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:212 __assert(ffffffff81f9f98e,ffffffff81f9d06c,156,ffffffff81f7a131) at __assert+0x2e sys/kern/subr_prf.c:159 arpresolve(ffff8000001732a8,fffffd80685a0318,fffffd8064b82600,fffffd806f6f24e0,ffff800022e451a8) at arpresolve+0x839 sys/netinet/if_ether.c:342 ether_resolve(ffff8000001732a8,fffffd8064b82600,fffffd806f6f24e0,fffffd80685a0318,ffff800022e451a8) at ether_resolve+0x20d sys/net/if_ethersubr.c:211 ether_output(ffff8000001732a8,fffffd8064b82600,fffffd806f6f24e0,fffffd80685a0318) at ether_output+0x47 ether_encap sys/net/if_ethersubr.c:307 [inline] ether_output(ffff8000001732a8,fffffd8064b82600,fffffd806f6f24e0,fffffd80685a0318) at ether_output+0x47 sys/net/if_ethersubr.c:336 ip_output(fffffd8064b82600,0,fffffd806f6f24d0,800,0,fffffd806f6f2460) at ip_output+0x1167 sys/netinet/ip_output.c:470 tcp_output(ffff8000009a9aa0) at tcp_output+0x26d1 sys/netinet/tcp_output.c:1040 tcp_usrreq(fffffd806f6f3300,4,0,fffffd8075876c00,0,ffff800020b9a4c8) at tcp_usrreq+0x23b sys_connect(ffff800020b9a4c8,ffff800022e45618,ffff800022e45680) at sys_connect+0x3dc sys/kern/uipc_syscalls.c:388 syscall(ffff800022e456f0) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800022e456f0) at syscall+0x552 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,fffffffffffffee1,0,3,923641bb010) at Xsyscall+0x128 end of kernel end trace frame: 0x92595ef37b0, count: -12 ddb{1}> show registers rdi 0xffffffff81c63ee7 db_enter+0x17 rsi 0x3a2b __ALIGN_SIZE+0x2a2b rbp 0xffff800022e44f70 rbx 0xffff800022e45020 rdx 0x3a2c __ALIGN_SIZE+0x2a2c rcx 0xffff800020c16000 rax 0xffff800020c16000 r8 0xffffffff8174e1a3 kprintf+0x173 r9 0x1 r10 0x25 r11 0x37b138db95cf4c80 r12 0x3000000008 r13 0xffff800022e44f80 r14 0x100 r15 0x1 rip 0xffffffff81c63ee8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022e44f60 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=414026 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020b9abd0,0xffffffff82375270 process=0xffff800020b8d3c8 user=0xffff800022e40000, vmspace=0xfffffd807effe2d0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 30206 353181 12748 0 7 0 syz-executor.0 *30206 414026 12748 0 7 0x4000000 syz-executor.0 48415 523591 1 0 3 0x100083 ttyin getty 17563 2500 0 0 3 0x14200 bored sosplice 25710 18325 70172 0 3 0x2 biowait syz-executor.1 12748 70416 70172 0 3 0x82 nanosleep syz-executor.0 70172 359482 19985 0 3 0x82 thrsleep syz-fuzzer 70172 298170 19985 0 3 0x4000082 nanosleep syz-fuzzer 70172 12735 19985 0 3 0x4000082 thrsleep syz-fuzzer 70172 451802 19985 0 3 0x4000082 kqread syz-fuzzer 70172 154045 19985 0 3 0x4000082 thrsleep syz-fuzzer 70172 84710 19985 0 3 0x4000082 thrsleep syz-fuzzer 70172 256301 19985 0 3 0x4000082 thrsleep syz-fuzzer 70172 116628 19985 0 3 0x4000082 thrsleep syz-fuzzer 70172 297847 19985 0 3 0x4000082 thrsleep syz-fuzzer 70172 431021 19985 0 3 0x4000082 thrsleep syz-fuzzer 19985 489647 22503 0 3 0x10008a pause ksh 22503 199866 94308 0 3 0x92 select sshd 94308 421200 1 0 3 0x80 select sshd 62373 285575 22033 74 3 0x100092 bpf pflogd 22033 414682 1 0 3 0x80 netio pflogd 77933 191777 81985 73 3 0x100090 kqread syslogd 81985 431892 1 0 3 0x100082 netio syslogd 92650 295844 1 77 3 0x100090 poll dhclient 16208 186303 1 0 3 0x80 poll dhclient 91275 500175 0 0 3 0x14200 pgzero zerothread 86327 242812 0 0 3 0x14200 aiodoned aiodoned 40685 56169 0 0 3 0x14200 syncer update 21953 84062 0 0 3 0x14200 cleaner cleaner 718 79321 0 0 3 0x14200 reaper reaper 60623 477463 0 0 3 0x14200 pgdaemon pagedaemon 39121 47280 0 0 3 0x14200 bored crynlk 64000 161622 0 0 3 0x14200 bored crypto 78221 360782 0 0 3 0x40014200 acpi0 acpi0 37101 255764 0 0 3 0x40014200 idle1 10485 216931 0 0 3 0x14200 bored softnet 37075 244253 0 0 3 0x14200 bored systqmp 26257 176534 0 0 3 0x14200 bored systq 76185 196783 0 0 3 0x40014200 bored softclock 52576 295849 0 0 3 0x40014200 idle0 28505 334108 0 0 3 0x14200 bored smr 1 434932 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 30206 (syz-executor.0) thread 0xffff800020b9a4c8 (414026) exclusive rwlock netlock r = 0 (0xffffffff8220efe8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1161 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sys_connect+0x6b sys/kern/uipc_syscalls.c:362 #3 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] #3 syscall+0x552 sys/arch/amd64/amd64/trap.c:574 #4 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82382bd0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1161 #1 syscall+0x43a mi_syscall sys/sys/syscall_mi.h:91 [inline] #1 syscall+0x43a sys/arch/amd64/amd64/trap.c:574 #2 Xsyscall+0x128 Process 25710 (syz-executor.1) thread 0xffff800020b9b530 (18325) exclusive rrwlock inode r = 0 (0xfffffd806ecadb38) #0 witness_lock+0x52e sys/kern/subr_witness.c:1161 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:549 #5 vget+0x1c3 sys/kern/vfs_subr.c:672 #6 ufs_ihashget+0x141 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x74 sys/ufs/ffs/ffs_vfsops.c:1323 #8 ufs_lookup+0x1575 sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90 #10 vfs_lookup+0x77d sys/kern/vfs_lookup.c:571 #11 namei+0x61c sys/kern/vfs_lookup.c:252 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1762 #13 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] #13 syscall+0x552 sys/arch/amd64/amd64/trap.c:574 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e3abe68) #0 witness_lock+0x52e sys/kern/subr_witness.c:1161 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:549 #5 vget+0x1c3 sys/kern/vfs_subr.c:672 #6 cache_lookup+0x2cf sys/kern/vfs_cache.c:224 #7 ufs_lookup+0x1ad sys/ufs/ufs/ufs_lookup.c:162 #8 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90 #9 vfs_lookup+0x77d sys/kern/vfs_lookup.c:571 #10 namei+0x61c sys/kern/vfs_lookup.c:252 #11 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1762 #12 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] #12 syscall+0x552 sys/arch/amd64/amd64/trap.c:574 #13 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9522 7191K 7450K 78643K 14727 0 0 pcb 25 9K 11K 78643K 728 0 0 rtable 122 5K 5K 78643K 531 0 0 ifaddr 54 13K 14K 78643K 172 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1529 0 0 iov 0 0K 24K 78643K 140 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1206 76K 76K 78643K 2643 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 22 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 82 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12628 0 0 file desc 5 13K 25K 78643K 1615 0 0 sigio 0 0K 0K 78643K 18 0 0 proc 54 51K 83K 78643K 548 0 0 subproc 32 2K 2K 78643K 34 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 107 0 0 in_multi 33 2K 2K 78643K 66 0 0 ether_multi 1 0K 0K 78643K 10 0 0 mrt 0 0K 0K 78643K 6 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 314 0 0 pfkey data 0 0K 0K 78643K 2 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 102 21K 30K 78643K 6075 0 0 UVM aobj 73 3K 3K 78643K 78 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 78 0 0 NDP 10 0K 0K 78643K 45 0 0 temp 157 2731K 3371K 78643K 8211 0 0 kqueue 0 0K 0K 78643K 9 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 6 0 0 1 0 1 1 0 8 0 inpcbpl 280 558 0 550 1 0 1 1 0 8 0 plimitpl 152 44 0 36 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 61 0 13 2 0 2 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 6 0 6 1 1 0 1 0 8 0 tcpcb 544 194 0 189 1 0 1 1 0 8 0 rttmr 72 3 0 3 2 2 0 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 ppxss 1128 21 0 21 8 7 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 30 0 21 1 0 1 1 0 8 0 pfstkey 112 30 0 21 1 0 1 1 0 8 0 pfstate 328 30 0 21 2 0 2 2 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 194 0 0 13 0 13 13 0 8 0 art_table 32 196 0 0 2 0 2 2 0 8 0 art_node 16 51 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 7 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 80 0 70 1 0 1 1 0 8 0 shmpl 112 76 0 5 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 3933 0 2502 47 0 47 47 0 8 0 ffsino 272 3933 0 2502 96 0 96 96 0 8 0 nchpl 144 6316 0 4674 63 1 62 62 0 8 0 uvmvnodes 72 4950 0 0 90 0 90 90 0 8 0 vnodes 200 4950 0 0 261 0 261 261 0 8 0 namei 1024 18738 0 18738 5 4 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 18349 0 18348 19 15 4 6 0 8 3 sigapl 432 1817 0 1802 3 1 2 3 0 8 0 futexpl 56 18042 0 18042 2 1 1 1 0 8 1 knotepl 112 290 0 271 1 0 1 1 0 8 0 kqueuepl 104 348 0 346 1 0 1 1 0 8 0 pipepl 112 1114 0 1095 5 4 1 2 0 8 0 fdescpl 488 1818 0 1802 3 0 3 3 0 8 0 filepl 152 9992 0 9891 9 4 5 7 0 8 0 lockfpl 104 549 0 549 3 2 1 1 0 8 1 lockfspl 48 189 0 189 3 2 1 1 0 8 1 sessionpl 112 20 0 9 1 0 1 1 0 8 0 pgrppl 48 42 0 31 1 0 1 1 0 8 0 ucredpl 96 1862 0 1853 1 0 1 1 0 8 0 zombiepl 144 1802 0 1802 3 2 1 1 0 8 1 processpl 840 1834 0 1802 4 0 4 4 0 8 0 procpl 600 5246 0 5204 4 0 4 4 0 8 0 srpgc 64 3 0 3 2 2 0 1 0 8 0 sosppl 128 15 0 15 6 5 1 1 0 8 1 sockpl 384 1185 0 1165 7 4 3 4 0 8 1 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 9 0 0 1 0 1 1 0 8 0 mcl9k 9216 6 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 143 0 0 17 0 17 17 0 8 0 mtagpl 80 4 0 0 1 0 1 1 0 8 0 mbufpl 256 295 0 0 15 0 15 15 0 8 0 bufpl 256 9145 0 2137 439 0 439 439 0 8 0 anonpl 16 161748 0 151900 96 43 53 57 0 125 11 amapchunkpl 152 10039 0 9925 24 14 10 10 0 158 5 amappl16 192 8774 0 8265 63 33 30 38 0 8 4 amappl15 184 793 0 793 1 0 1 1 0 8 1 amappl14 176 36 0 34 2 1 1 1 0 8 0 amappl13 168 1 0 1 1 1 0 1 0 8 0 amappl12 160 805 0 802 1 0 1 1 0 8 0 amappl11 152 61 0 42 1 0 1 1 0 8 0 amappl10 144 77 0 74 1 0 1 1 0 8 0 amappl9 136 588 0 585 1 0 1 1 0 8 0 amappl8 128 143 0 127 1 0 1 1 0 8 0 amappl7 120 38 0 33 1 0 1 1 0 8 0 amappl6 112 61 0 53 1 0 1 1 0 8 0 amappl5 104 930 0 913 1 0 1 1 0 8 0 amappl4 96 1212 0 1184 1 0 1 1 0 8 0 amappl3 88 1026 0 1014 1 0 1 1 0 8 0 amappl2 80 14428 0 14358 3 0 3 3 0 8 0 amappl1 72 48290 0 47849 25 15 10 20 0 8 0 amappl 80 5506 0 5465 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 dma64 64 259 0 259 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 77 0 5 2 0 2 2 0 8 0 uaddrrnd 24 1818 0 1802 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1818 0 1802 1 0 1 1 0 8 0 vmmpekpl 168 17598 0 17567 2 0 2 2 0 8 0 vmmpepl 168 196270 0 194704 125 50 75 83 0 357 2 vmsppl 360 1817 0 1802 2 0 2 2 0 8 0 pdppl 4096 3644 0 3604 6 0 6 6 0 8 0 pvpl 32 475029 0 461987 211 68 143 147 0 265 36 pmappl 232 1817 0 1802 2 1 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 606 0 7 18 0 18 18 0 8 0