panic: malloc: allocation too lapanic: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_fork.c", line 689 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *456124 93832 0 0 0 1 syz-executor0 325706 98771 0 0 0x4000000 0 syz-executor1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x16c sys/kern/subr_prf.c:208 __assert(ffffffff81d851a4,ffff800020c9afe0,0,1) at __assert+0x24 sys/kern/subr_prf.c:155 proc_trampoline_mp() at proc_trampoline_mp+0x13e 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}> show panic malloc: allocation too large, type = 2, size = 2795614184 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x16c sys/kern/subr_prf.c:208 __assert(ffffffff81d851a4,ffff800020c9afe0,0,1) at __assert+0x24 sys/kern/subr_prf.c:155 proc_trampoline_mp() at proc_trampoline_mp+0x13e end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020c9af40 rbx 0xffff800020c9afe0 rdx 0xffffffff81f35469 cy_pio_rec+0x2087 rcx 0 rax 0 r8 0xffffffff81d85b34 kprintf+0x174 r9 0x1 r10 0x24998f93492e841f r11 0x9aa35d0ccd32cff1 r12 0x3000000008 r13 0xffff800020c9af50 r14 0x104 r15 0x1 rip 0xffffffff81bb44e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c9af30 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor0) pid=456124 stat=onproc flags process=0 proc=0 pri=77, usrpri=77, nice=20 forw=0xffffffffffffffff, list=0xffff800020b93c38,0xffffffff822f3540 process=0xffff800020b946a0 user=0xffff800020c96000, vmspace=0xfffffd807f00d5a0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *93832 456124 45843 0 7 0 syz-executor0 98771 203516 66159 0 2 0 syz-executor1 98771 523674 66159 0 2 0x4000000 syz-executor1 98771 325706 66159 0 7 0x4000000 syz-executor1 46171 211371 1 0 3 0x100083 ttyin getty 66159 38399 10143 0 3 0x82 nanosleep syz-executor1 8310 6098 0 0 3 0x14200 bored sosplice 45843 403842 10143 0 2 0x2 syz-executor0 10143 444340 16510 0 3 0x82 thrsleep syz-fuzzer 10143 79237 16510 0 3 0x4000082 thrsleep syz-fuzzer 10143 146831 16510 0 3 0x4000082 thrsleep syz-fuzzer 10143 207272 16510 0 3 0x4000082 thrsleep syz-fuzzer 10143 373813 16510 0 2 0x4000082 syz-fuzzer 10143 317235 16510 0 3 0x4000082 thrsleep syz-fuzzer 10143 51627 16510 0 3 0x4000082 thrsleep syz-fuzzer 10143 44355 16510 0 3 0x4000082 thrsleep syz-fuzzer 10143 206779 16510 0 3 0x4000082 thrsleep syz-fuzzer 10143 158187 16510 0 3 0x4000082 thrsleep syz-fuzzer 10143 41613 16510 0 3 0x4000082 thrsleep syz-fuzzer 10143 167307 16510 0 3 0x4000082 thrsleep syz-fuzzer 16510 346339 73508 0 3 0x10008a pause ksh 73508 341183 66822 0 3 0x92 select sshd 66822 508748 1 0 3 0x80 select sshd 13681 89846 82737 73 3 0x100090 kqread syslogd 82737 135640 1 0 3 0x100082 netio syslogd 61662 186186 1 77 3 0x100090 poll dhclient 19689 301258 1 0 3 0x80 poll dhclient 74185 290560 0 0 2 0x14200 zerothread 55813 253497 0 0 3 0x14200 aiodoned aiodoned 62673 70834 0 0 3 0x14200 syncer update 54296 183453 0 0 3 0x14200 cleaner cleaner 47796 4873 0 0 3 0x14200 reaper reaper 21049 43707 0 0 3 0x14200 pgdaemon pagedaemon 42349 75413 0 0 3 0x14200 bored crynlk 98110 381286 0 0 3 0x14200 bored crypto 55899 297276 0 0 3 0x40014200 acpi0 acpi0 58240 186505 0 0 3 0x40014200 idle1 44493 121655 0 0 3 0x14200 bored softnet 72936 346411 0 0 3 0x14200 bored systqmp 5537 284790 0 0 3 0x14200 bored systq 16049 123987 0 0 3 0x40014200 bored softclock 22349 203629 0 0 3 0x40014200 idle0 1 255570 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 98771 (syz-executor1) thread 0xffff800020b93c38 (325706) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff822d6828) locked @ /syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90 Process 45843 (syz-executor0) thread 0xffff800020b759d0 (403842) exclusive rrwlock inode r = 0 (0xfffffd8066708a28) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_ihash.c:140 exclusive rrwlock inode r = 0 (0xfffffd8077ca6e70) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_vnops.c:1547 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9517 10470K 10470K 78643K 10930 0 0 pcb 23 9K 10K 78643K 423 0 0 rtable 100 3K 4K 78643K 432 0 0 ifaddr 52 12K 13K 78643K 163 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 22 0 0 iov 0 0K 16K 78643K 82 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1203 75K 76K 78643K 1852 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 113 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 6 17K 25K 78643K 956 0 0 sigio 1 0K 0K 78643K 20 0 0 proc 42 38K 58K 78643K 486 0 0 subproc 64 65538K 67586K 78643K 175 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 118 0 0 in_multi 33 2K 2K 78643K 97 0 0 ether_multi 1 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 90 397K 397K 78643K 90 0 0 exec 0 0K 1K 78643K 227 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 90 20K 21K 78643K 3839 0 0 UVM aobj 54 2K 2K 78643K 59 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 1K 78643K 13 0 0 NDP 10 0K 0K 78643K 49 0 0 temp 156 2367K 2434K 78643K 5558 0 0 kqueue 0 0K 0K 78643K 17 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 7 0 3 1 0 1 1 0 8 0 inpcbpl 280 417 0 410 1 0 1 1 0 8 0 plimitpl 152 28 0 21 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 68 0 28 2 0 2 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 153 0 149 1 0 1 1 0 8 0 nd6 48 10 0 6 1 0 1 1 0 8 0 ppxss 1128 17 0 17 6 5 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 317 0 129 12 0 12 12 0 8 0 art_table 32 318 0 129 2 0 2 2 0 8 0 art_node 16 67 0 33 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 7 2 1 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 107 0 97 1 0 1 1 0 8 0 shmpl 112 57 0 5 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 3254 0 1860 46 0 46 46 0 8 0 ffsino 272 3254 0 1860 94 0 94 94 0 8 0 nchpl 144 4742 0 3169 59 0 59 59 0 8 0 uvmvnodes 72 3436 0 0 63 0 63 63 0 8 0 vnodes 200 3436 0 0 181 0 181 181 0 8 0 namei 1024 13608 0 13608 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 1 0 1 0 8 0 scxspl 192 12309 0 12309 13 10 3 6 0 8 3 sigapl 432 1116 0 1102 2 0 2 2 0 8 0 futexpl 56 10675 0 10675 1 0 1 1 0 8 1 knotepl 112 378 0 351 4 3 1 2 0 8 0 kqueuepl 104 321 0 319 1 0 1 1 0 8 0 pipepl 112 606 0 587 2 1 1 1 0 8 0 fdescpl 488 1117 0 1102 3 1 2 3 0 8 0 filepl 152 6565 0 6467 9 4 5 5 0 8 1 lockfpl 104 273 0 272 5 4 1 1 0 8 0 lockfspl 32 515 0 514 5 4 1 1 0 8 0 sessionpl 112 22 0 12 1 0 1 1 0 8 0 pgrppl 48 30 0 20 1 0 1 1 0 8 0 ucredpl 96 1698 0 1691 1 0 1 1 0 8 0 zombiepl 144 1102 0 1102 2 1 1 1 0 8 1 processpl 840 1132 0 1102 4 0 4 4 0 8 0 procpl 600 3145 0 3102 6 2 4 5 0 8 0 srpgc 64 18 0 18 1 1 0 1 0 8 0 sosppl 128 18 0 18 3 3 0 1 0 8 0 sockpl 384 811 0 794 5 2 3 3 0 8 1 mcl64k 65536 378 0 0 48 11 37 48 0 8 1 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 8 0 0 1 0 1 1 0 8 0 mcl9k 9216 7 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 11 0 0 2 0 2 2 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 106 0 0 13 1 12 13 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 471 0 0 28 0 28 28 0 8 0 bufpl 256 6350 0 980 336 0 336 336 0 8 0 anonpl 16 123312 0 115727 89 56 33 47 0 125 2 amapchunkpl 152 6367 0 6253 18 12 6 10 0 158 0 amappl16 192 6065 0 5692 66 45 21 31 0 8 1 amappl15 184 466 0 465 2 1 1 1 0 8 0 amappl14 176 302 0 298 2 1 1 1 0 8 0 amappl13 168 28 0 25 1 0 1 1 0 8 0 amappl12 160 15 0 15 1 1 0 1 0 8 0 amappl11 152 198 0 189 1 0 1 1 0 8 0 amappl10 144 65 0 63 2 1 1 1 0 8 0 amappl9 136 344 0 343 1 0 1 1 0 8 0 amappl8 128 172 0 145 1 0 1 1 0 8 0 amappl7 120 42 0 35 1 0 1 1 0 8 0 amappl6 112 341 0 332 1 0 1 1 0 8 0 amappl5 104 593 0 582 1 0 1 1 0 8 0 amappl4 96 295 0 275 2 1 1 2 0 8 0 amappl3 88 375 0 370 1 0 1 1 0 8 0 amappl2 80 9498 0 9449 2 0 2 2 0 8 0 amappl1 72 32815 0 32386 24 14 10 19 0 8 0 amappl 72 3408 0 3367 1 0 1 1 0 75 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 58 0 5 1 0 1 1 0 8 0 uaddrrnd 24 1117 0 1102 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1117 0 1102 1 0 1 1 0 8 0 vmmpekpl 168 12570 0 12548 2 0 2 2 0 8 0 vmmpepl 168 125935 0 124557 109 45 64 73 0 357 2 vmsppl 360 1116 0 1102 2 0 2 2 0 8 0 pdppl 4096 2241 0 2204 6 1 5 6 0 8 0 pvpl 32 350672 0 340062 172 70 102 123 0 265 13 pmappl 224 1116 0 1102 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 549 0 15 16 0 16 16 0 8 0