panic: malloc: allocation too large, type = 2, size = 2147483656 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 6876 94080 0 0 0 0 syz-executor.0 *126634 94080 0 0 0x4000000 1K syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x174 sys/kern/subr_prf.c:208 malloc(80000008,2,2) at malloc+0xa6f sys/kern/kern_malloc.c:339 wsmux_getmux(10000000) at wsmux_getmux+0x71 sys/dev/wscons/wsmux.c:152 wsmux_add_mux(10000000,ffff800000026d00) at wsmux_add_mux+0x2f sys/dev/wscons/wsmux.c:594 VOP_IOCTL(fffffd80689d2dd8,80085761,ffff800020c01310,42,fffffd807f7c6960,ffff800020b38270) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80671b5868,80085761,ffff800020c01310,ffff800020b38270) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b38270,ffff800020c01458,ffff800020c01440) at sys_ioctl+0x651 syscall(ffff800020c014f0) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c014f0) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff85,0,3,8048a06b010) at Xsyscall+0x128 end of kernel end trace frame: 0x806c7c15010, count: 5 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 = 2147483656 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x174 sys/kern/subr_prf.c:208 malloc(80000008,2,2) at malloc+0xa6f sys/kern/kern_malloc.c:339 wsmux_getmux(10000000) at wsmux_getmux+0x71 sys/dev/wscons/wsmux.c:152 wsmux_add_mux(10000000,ffff800000026d00) at wsmux_add_mux+0x2f sys/dev/wscons/wsmux.c:594 VOP_IOCTL(fffffd80689d2dd8,80085761,ffff800020c01310,42,fffffd807f7c6960,ffff800020b38270) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80671b5868,80085761,ffff800020c01310,ffff800020b38270) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b38270,ffff800020c01458,ffff800020c01440) at sys_ioctl+0x651 syscall(ffff800020c014f0) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c014f0) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff85,0,3,8048a06b010) at Xsyscall+0x128 end of kernel end trace frame: 0x806c7c15010, count: -10 ddb{1}> show registers rdi 0xffffffff815744d7 db_enter+0x17 rsi 0x1607 __ALIGN_SIZE+0x607 rbp 0xffff800020c00ee0 rbx 0xffff800020c00f90 rdx 0x1608 __ALIGN_SIZE+0x608 rcx 0xffff800000966000 rax 0xffff800000966000 r8 0xffffffff8161baa3 kprintf+0x183 r9 0x1 r10 0x25 r11 0x99c35b7ab601a7e4 r12 0x3000000008 r13 0xffff800020c00ef0 r14 0x100 r15 0x1 rip 0xffffffff815744d8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c00ed0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=126634 stat=onproc flags process=0 proc=4000000 pri=80, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff800020b392d8,0xffffffff82382238 process=0xffff800020b8d080 user=0xffff800020bfc000, vmspace=0xfffffd807effeb40 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 94080 6876 1328 0 7 0 syz-executor.0 *94080 126634 1328 0 7 0x4000000 syz-executor.0 1328 397401 42247 0 3 0x82 nanosleep syz-executor.0 30055 172849 0 0 3 0x14200 bored sosplice 96615 39755 42247 0 3 0x2 biowait syz-executor.1 42247 21456 66636 0 3 0x82 thrsleep syz-fuzzer 42247 340380 66636 0 3 0x4000082 thrsleep syz-fuzzer 42247 345609 66636 0 3 0x4000082 thrsleep syz-fuzzer 42247 64644 66636 0 3 0x4000082 kqread syz-fuzzer 42247 346966 66636 0 3 0x4000082 thrsleep syz-fuzzer 42247 166597 66636 0 3 0x4000082 thrsleep syz-fuzzer 42247 209724 66636 0 3 0x4000082 thrsleep syz-fuzzer 42247 490014 66636 0 3 0x4000082 thrsleep syz-fuzzer 42247 403852 66636 0 3 0x4000082 thrsleep syz-fuzzer 42247 498406 66636 0 3 0x4000082 thrsleep syz-fuzzer 66636 312133 2975 0 3 0x10008a pause ksh 2975 280281 34970 0 3 0x92 select sshd 79915 47430 1 0 3 0x100083 ttyin getty 34970 38301 1 0 3 0x80 select sshd 83721 143303 95256 74 3 0x100092 bpf pflogd 95256 313701 1 0 3 0x80 netio pflogd 69743 6456 81243 73 3 0x100090 kqread syslogd 81243 399375 1 0 3 0x100082 netio syslogd 28252 457519 1 77 3 0x100090 poll dhclient 45681 7554 1 0 3 0x80 poll dhclient 12268 83903 0 0 3 0x14200 pgzero zerothread 40109 199369 0 0 3 0x14200 aiodoned aiodoned 28720 279197 0 0 3 0x14200 syncer update 75414 241775 0 0 3 0x14200 cleaner cleaner 98598 456463 0 0 3 0x14200 reaper reaper 55595 187217 0 0 3 0x14200 pgdaemon pagedaemon 91855 434614 0 0 3 0x14200 bored crynlk 98343 115447 0 0 3 0x14200 bored crypto 41345 45048 0 0 3 0x40014200 acpi0 acpi0 97194 324708 0 0 3 0x40014200 idle1 5986 309325 0 0 3 0x14200 bored softnet 59446 407702 0 0 3 0x14200 bored systqmp 45646 385325 0 0 3 0x14200 bored systq 89413 194329 0 0 3 0x40014200 bored softclock 49970 86289 0 0 3 0x40014200 idle0 75297 31023 0 0 3 0x14200 bored smr 1 498465 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 94080 (syz-executor.0) thread 0xffff800020b38270 (126634) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff823959b0) locked @ /syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90 #0 witness_lock+0x594 sys/kern/subr_witness.c:1201 #1 syscall+0x48b mi_syscall sys/sys/syscall_mi.h:91 [inline] #1 syscall+0x48b sys/arch/amd64/amd64/trap.c:574 #2 Xsyscall+0x128 Process 96615 (syz-executor.1) thread 0xffff800020b15c28 (39755) exclusive rrwlock inode r = 0 (0xfffffd806e305d58) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_ihash.c:140 #0 witness_lock+0x594 sys/kern/subr_witness.c:1201 #1 _rw_enter+0x45d sys/kern/kern_rwlock.c:280 #2 _rrw_enter+0x60 sys/kern/kern_rwlock.c:410 #3 ufs_ihashins+0x6d sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x143 sys/ufs/ffs/ffs_vfsops.c:1352 #5 ffs_inode_alloc+0x1cf sys/ufs/ffs/ffs_alloc.c:392 #6 ufs_mkdir+0x10f sys/ufs/ufs/ufs_vnops.c:1164 #7 VOP_MKDIR+0x76 sys/kern/vfs_vops.c:449 #8 domkdirat+0x12d sys/kern/vfs_syscalls.c:2881 #9 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] #9 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e3054d8) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_vnops.c:1547 #0 witness_lock+0x594 sys/kern/subr_witness.c:1201 #1 _rw_enter+0x45d sys/kern/kern_rwlock.c:280 #2 _rrw_enter+0x60 sys/kern/kern_rwlock.c:410 #3 VOP_LOCK+0x57 sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:549 #5 vfs_lookup+0xf5 sys/kern/vfs_lookup.c:387 #6 namei+0x4b2 sys/kern/vfs_lookup.c:224 #7 domkdirat+0x81 sys/kern/vfs_syscalls.c:2866 #8 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] #8 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9513 10515K 10520K 78643K 10754 0 0 pcb 25 9K 10K 78643K 252 0 0 rtable 103 4K 4K 78643K 403 0 0 ifaddr 55 12K 13K 78643K 120 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1473 0 0 iov 0 0K 24K 78643K 55 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1196 75K 75K 78643K 1430 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 8 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 60 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12628 0 0 file desc 5 13K 21K 78643K 377 0 0 sigio 0 0K 0K 78643K 10 0 0 proc 53 50K 71K 78643K 431 0 0 subproc 64 65538K 67586K 78643K 204 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 41 0 0 in_multi 33 2K 2K 78643K 80 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 66 291K 291K 78643K 66 0 0 exec 0 0K 1K 78643K 237 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 84 20K 25K 78643K 2072 0 0 UVM aobj 29 4K 4K 78643K 29 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 25 0 0 NDP 11 0K 0K 78643K 37 0 0 temp 143 2370K 2436K 78643K 4411 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 4 1 0 1 1 0 8 0 inpcbpl 280 255 0 248 1 0 1 1 0 8 0 plimitpl 152 33 0 25 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 79 0 39 2 0 2 2 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 21 0 21 1 1 0 1 0 8 0 tcpcb 544 95 0 91 1 0 1 1 0 8 0 nd6 48 12 0 8 1 0 1 1 0 8 0 ppxss 1128 8 0 8 3 3 0 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 0 0 1 0 1 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 22 0 14 1 0 1 1 0 8 0 pfstkey 112 22 0 14 1 0 1 1 0 8 0 pfstate 328 22 0 14 2 1 1 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 256 351 0 164 12 0 12 12 0 8 0 art_table 32 352 0 164 2 0 2 2 0 8 0 art_node 16 76 0 42 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 56 0 46 1 0 1 1 0 8 0 shmpl 112 27 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2041 0 612 47 0 47 47 0 8 0 ffsino 272 2041 0 612 96 0 96 96 0 8 0 nchpl 144 2756 0 1111 62 0 62 62 0 8 0 uvmvnodes 72 2185 0 0 40 0 40 40 0 8 0 vnodes 200 2185 0 0 115 0 115 115 0 8 0 namei 1024 8076 0 8075 4 3 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 7901 0 7900 11 10 1 6 0 8 0 sigapl 432 564 0 549 2 0 2 2 0 8 0 futexpl 56 3965 0 3965 2 1 1 1 0 8 1 knotepl 112 180 0 161 1 0 1 1 0 8 0 kqueuepl 104 65 0 63 1 0 1 1 0 8 0 pipepl 112 362 0 343 2 1 1 1 0 8 0 fdescpl 488 565 0 549 3 0 3 3 0 8 0 filepl 152 3193 0 3092 6 1 5 5 0 8 1 lockfpl 104 100 0 99 4 3 1 1 0 8 0 lockfspl 32 125 0 124 4 3 1 1 0 8 0 sessionpl 112 22 0 11 1 0 1 1 0 8 0 pgrppl 48 28 0 17 1 0 1 1 0 8 0 ucredpl 96 505 0 496 1 0 1 1 0 8 0 zombiepl 144 549 0 549 3 2 1 1 0 8 1 processpl 840 581 0 549 4 0 4 4 0 8 0 procpl 600 1327 0 1285 4 0 4 4 0 8 0 srpgc 64 24 0 24 3 2 1 1 0 8 1 sosppl 128 2 0 2 1 1 0 1 0 8 0 sockpl 384 465 0 446 5 2 3 3 0 8 1 mcl64k 65536 257 0 0 33 8 25 33 0 8 1 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 4 0 0 1 0 1 1 0 8 0 mcl9k 9216 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 8 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 138 0 0 16 0 16 16 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 348 0 0 21 2 19 21 0 8 1 bufpl 256 6425 0 1147 330 0 330 330 0 8 0 anonpl 16 79003 0 70985 70 17 53 53 0 125 16 amapchunkpl 152 2993 0 2897 7 0 7 7 0 158 2 amappl16 192 3135 0 2672 60 28 32 36 0 8 8 amappl15 184 121 0 115 1 0 1 1 0 8 0 amappl14 176 55 0 50 2 1 1 1 0 8 0 amappl13 168 30 0 27 1 0 1 1 0 8 0 amappl12 160 31 0 28 2 1 1 1 0 8 0 amappl11 152 82 0 67 1 0 1 1 0 8 0 amappl10 144 233 0 228 1 0 1 1 0 8 0 amappl9 136 685 0 682 1 0 1 1 0 8 0 amappl8 128 247 0 232 1 0 1 1 0 8 0 amappl7 120 203 0 196 1 0 1 1 0 8 0 amappl6 112 67 0 58 1 0 1 1 0 8 0 amappl5 104 149 0 133 1 0 1 1 0 8 0 amappl4 96 780 0 751 2 1 1 2 0 8 0 amappl3 88 142 0 136 1 0 1 1 0 8 0 amappl2 80 3767 0 3711 2 0 2 2 0 8 0 amappl1 72 21978 0 21538 26 16 10 20 0 8 0 amappl 72 1600 0 1563 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 28 0 0 1 0 1 1 0 8 0 uaddrrnd 24 565 0 549 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 565 0 549 1 0 1 1 0 8 0 vmmpekpl 168 8704 0 8681 2 0 2 2 0 8 0 vmmpepl 168 69777 0 68315 107 26 81 81 0 357 15 vmsppl 360 564 0 549 2 0 2 2 0 8 0 pdppl 4096 1138 0 1098 6 0 6 6 0 8 0 pvpl 32 234063 0 222801 170 34 136 137 0 265 36 pmappl 224 564 0 549 2 1 1 2 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 530 0 16 15 0 15 15 0 8 0