panic: malloc: allocation too large, type = 2, size = 184467p4a4n07ic3:7 0k95er5n0e3l3 diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_fork.c", line 690 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 184487 21242 0 0 0x4000000 0 syz-executor.0 *483940 54024 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(ffffffff82201755,ffffffff821eedab,2b2,ffffffff821d32a3) 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 malloc: allocation too large, type = 2, size = 18446744073709550336 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(ffffffff82201755,ffffffff821eedab,2b2,ffffffff821d32a3) 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 0xffff800022d6d7c0 rbx 0xffff800022d6d870 rdx 0xffff800020ab09f8 rcx 0 rax 0 r8 0xffffffff810af37f kprintf+0x16f r9 0x1 r10 0x25 r11 0x3ee75d74eb813f73 r12 0x3000000008 r13 0xffff800022d6d7d0 r14 0x104 r15 0x1 rip 0xffffffff8193b028 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022d6d7b0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=483940 stat=onproc flags process=0 proc=4000000 pri=81, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab0ee8,0xffff800020ab1170 process=0xffff800020adce00 user=0xffff800022d68000, vmspace=0xfffffd807f00ba10 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 21242 371769 9444 0 2 0 syz-executor.0 21242 184487 9444 0 7 0x4000000 syz-executor.0 54024 363031 80489 0 2 0 syz-executor.1 *54024 483940 80489 0 7 0x4000000 syz-executor.1 66210 448336 0 0 3 0x14200 acct acct 9444 232352 23762 0 3 0x82 nanosleep syz-executor.0 80489 278747 23762 0 3 0x82 nanosleep syz-executor.1 80820 78877 0 0 3 0x14200 bored sosplice 23762 199467 74085 0 3 0x82 thrsleep syz-fuzzer 23762 91210 74085 0 3 0x4000082 nanosleep syz-fuzzer 23762 292914 74085 0 3 0x4000082 thrsleep syz-fuzzer 23762 104817 74085 0 3 0x4000082 thrsleep syz-fuzzer 23762 420285 74085 0 3 0x4000082 kqread syz-fuzzer 23762 168630 74085 0 3 0x4000082 thrsleep syz-fuzzer 23762 54191 74085 0 3 0x4000082 thrsleep syz-fuzzer 23762 45438 74085 0 3 0x4000082 thrsleep syz-fuzzer 23762 125705 74085 0 3 0x4000082 thrsleep syz-fuzzer 23762 451736 74085 0 3 0x4000082 thrsleep syz-fuzzer 74085 285207 16783 0 3 0x10008a pause ksh 16783 512343 62571 0 3 0x92 select sshd 96921 320136 1 0 3 0x100083 ttyin getty 62571 227093 1 0 3 0x80 select sshd 76547 64201 88305 74 3 0x100092 bpf pflogd 88305 498039 1 0 3 0x80 netio pflogd 66793 152446 82587 73 3 0x100090 kqread syslogd 82587 420247 1 0 3 0x100082 netio syslogd 42223 156821 1 77 3 0x100090 poll dhclient 97871 70499 1 0 3 0x80 poll dhclient 92458 52367 0 0 2 0x14200 zerothread 69878 277299 0 0 3 0x14200 aiodoned aiodoned 37470 169119 0 0 3 0x14200 syncer update 82567 516131 0 0 3 0x14200 cleaner cleaner 21824 449957 0 0 3 0x14200 reaper reaper 24768 204468 0 0 3 0x14200 pgdaemon pagedaemon 17151 394682 0 0 3 0x14200 bored crynlk 16192 147541 0 0 3 0x14200 bored crypto 80313 441908 0 0 3 0x40014200 acpi0 acpi0 75891 239869 0 0 3 0x40014200 idle1 13182 288979 0 0 3 0x14200 bored softnet 71033 335930 0 0 3 0x14200 bored systqmp 86003 360261 0 0 3 0x14200 bored systq 76184 332303 0 0 3 0x40014200 bored softclock 65642 323393 0 0 3 0x40014200 idle0 83401 124577 0 0 3 0x14200 bored smr 1 245579 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 21242 (syz-executor.0) thread 0xffff800020ab1160 (184487) shared rwlock vmlistlock r = 0 (0xffff80000066f478) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 vm_get_info+0x39 sys/arch/amd64/amd64/vmm.c:3712 #2 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 #3 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 #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 (0xffffffff82620e88) #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 9568 6515K 7156K 78643K 18114 0 0 pcb 13 8K 8K 78643K 289 0 0 rtable 119 12K 13K 78643K 3562 0 0 ifaddr 72 22K 27K 78643K 1791 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1585 0 0 iov 0 0K 16K 78643K 156 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1207 76K 77K 78643K 3987 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 37 0 0 VM map 2 1K 1K 78643K 10 0 0 sem 12 1K 1K 78643K 2395 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1809 196K 290K 78643K 12843 0 0 file desc 6 17K 25K 78643K 3129 0 0 sigio 0 0K 0K 78643K 15 0 0 proc 61 63K 95K 78643K 1043 0 0 subproc 32 2K 2K 78643K 189 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 182 0 0 in_multi 33 2K 2K 78643K 208 0 0 ether_multi 1 0K 0K 78643K 12 0 0 mrt 0 0K 0K 78643K 4 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 84 371K 371K 78643K 84 0 0 exec 0 0K 1K 78643K 544 0 0 pfkey data 0 0K 4K 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 100 21K 30K 78643K 10501 0 0 UVM aobj 96 3K 3K 78643K 119 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 259 0 0 NDP 16 0K 0K 78643K 530 0 0 temp 200 3560K 4200K 78643K 43621 0 0 kqueue 0 0K 0K 78643K 18 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 25 0 19 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 114 0 112 1 0 1 1 0 8 0 rtentry 112 142 0 96 2 0 2 2 0 8 0 unpcb 120 727 0 717 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 6121 0 6121 2 2 0 2 0 8 0 tcpcb 544 458 0 454 1 0 1 1 0 8 0 inpcb 280 1386 0 1379 5 3 2 2 0 8 1 nd6 48 22 0 18 1 0 1 1 0 8 0 pkpcb 40 11 0 11 5 5 0 1 0 8 0 swfcl 56 4 0 0 1 0 1 1 0 8 0 ppxss 1128 472 0 472 8 7 1 1 0 8 1 pffrag 232 4 0 4 3 3 0 1 0 482 0 pffrnode 88 4 0 4 3 3 0 1 0 8 0 pffrent 40 8 0 8 3 3 0 1 0 8 0 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 66 0 49 1 0 1 1 0 8 0 pfstkey 112 67 0 50 1 0 1 1 0 8 0 pfstate 328 67 0 48 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 256 665 0 417 21 5 16 16 0 8 0 art_table 32 666 0 417 3 0 3 3 0 8 0 art_node 16 137 0 95 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 7 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 2393 0 2383 1 0 1 1 0 8 0 shmpl 112 117 0 23 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 6860 0 5464 46 0 46 46 0 8 0 ffsino 272 6860 0 5464 94 0 94 94 0 8 0 nchpl 144 10811 0 9206 61 1 60 61 0 8 0 uvmvnodes 72 6096 0 0 111 0 111 111 0 8 0 vnodes 208 6096 0 0 321 0 321 321 0 8 0 namei 1024 38484 0 38484 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vmpool 552 8 0 8 4 4 0 1 0 8 0 scsiplug 64 5 0 5 4 3 1 1 0 8 1 scxspl 192 29768 0 29768 15 11 4 7 0 8 4 plimitpl 152 222 0 214 1 0 1 1 0 8 0 sigapl 432 3302 0 3286 4 2 2 3 0 8 0 futexpl 56 46260 0 46260 1 0 1 1 0 8 1 knotepl 112 608 0 589 1 0 1 1 0 8 0 kqueuepl 104 504 0 502 1 0 1 1 0 8 0 pipepl 112 1272 0 1253 1 0 1 1 0 8 0 fdescpl 488 3303 0 3286 3 0 3 3 0 8 0 filepl 152 20737 0 20634 6 1 5 5 0 8 1 lockfpl 104 2197 0 2195 1 0 1 1 0 8 0 lockfspl 48 816 0 814 1 0 1 1 0 8 0 sessionpl 112 27 0 16 1 0 1 1 0 8 0 pgrppl 48 51 0 40 1 0 1 1 0 8 0 ucredpl 96 4789 0 4780 1 0 1 1 0 8 0 zombiepl 144 3288 0 3288 2 1 1 1 0 8 1 processpl 896 3322 0 3288 4 0 4 4 0 8 0 procpl 632 9338 0 9293 8 3 5 5 0 8 1 srpgc 64 18 0 18 6 6 0 1 0 8 0 sosppl 128 22 0 22 6 5 1 1 0 8 1 sockpl 384 2254 0 2235 6 3 3 4 0 8 1 mcl64k 65536 13 0 0 2 0 2 2 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 16 0 0 2 0 2 2 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 18 0 0 3 0 3 3 0 8 0 mcl4k 4096 12 0 0 2 0 2 2 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 235 0 0 26 2 24 26 0 8 0 mtagpl 80 29 0 0 1 0 1 1 0 8 0 mbufpl 256 276 0 0 16 1 15 15 0 8 0 bufpl 256 13079 0 6031 441 0 441 441 0 8 0 anonpl 16 281523 0 268747 109 41 68 68 0 124 15 amapchunkpl 152 18463 0 18351 33 27 6 19 0 158 0 amappl16 192 15274 0 14577 97 54 43 47 0 8 8 amappl15 184 1 0 1 1 1 0 1 0 8 0 amappl14 176 100 0 96 1 0 1 1 0 8 0 amappl13 168 432 0 432 2 2 0 1 0 8 0 amappl12 160 509 0 509 3 3 0 1 0 8 0 amappl11 152 623 0 604 1 0 1 1 0 8 0 amappl10 144 136 0 131 1 0 1 1 0 8 0 amappl9 136 2041 0 2033 1 0 1 1 0 8 0 amappl8 128 1534 0 1506 1 0 1 1 0 8 0 amappl7 120 201 0 193 1 0 1 1 0 8 0 amappl6 112 610 0 597 1 0 1 1 0 8 0 amappl5 104 701 0 688 1 0 1 1 0 8 0 amappl4 96 3486 0 3453 1 0 1 1 0 8 0 amappl3 88 677 0 672 1 0 1 1 0 8 0 amappl2 80 25456 0 25372 3 1 2 3 0 8 0 amappl1 72 79328 0 78880 26 16 10 20 0 8 0 amappl 80 9726 0 9687 1 0 1 1 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 64 118 0 23 2 0 2 2 0 8 0 uaddrrnd 24 3311 0 3286 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3311 0 3286 1 0 1 1 0 8 0 vmmpekpl 168 27357 0 27324 3 1 2 2 0 8 0 vmmpepl 168 404696 0 402759 197 101 96 106 0 357 11 vmsppl 368 3302 0 3286 2 0 2 2 0 8 0 pdppl 4096 6629 0 6588 7 1 6 6 0 8 0 pvpl 32 812328 0 796278 278 111 167 170 0 265 37 pmappl 232 3310 0 3294 4 3 1 2 0 8 0 extentpl 40 38 0 22 1 0 1 1 0 8 0 phpool 112 626 0 13 18 0 18 18 0 8 0