panic: malloc: allocation too large, type = 2, size = 3462255744 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *238102 451 0 0x2 0 0K syz-executor5947 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x174 sys/kern/subr_prf.c:208 malloc(ce5dd480,2,2) at malloc+0xa6f sys/kern/kern_malloc.c:339 wsmux_getmux(19cbba8f) at wsmux_getmux+0x71 sys/dev/wscons/wsmux.c:139 wsmux_do_ioctl(ffff80000069ea00,80085761,ffff800020baef50,f,ffff800020b952d0) at wsmux_do_ioctl+0x29e wsmux_add_mux sys/dev/wscons/wsmux.c:579 [inline] wsmux_do_ioctl(ffff80000069ea00,80085761,ffff800020baef50,f,ffff800020b952d0) at wsmux_do_ioctl+0x29e sys/dev/wscons/wsmux.c:432 VOP_IOCTL(fffffd806dc943f0,80085761,ffff800020baef50,f,fffffd807f7c7c60,ffff800020b952d0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd806fcae000,80085761,ffff800020baef50,ffff800020b952d0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b952d0,ffff800020baf098,ffff800020baf080) at sys_ioctl+0x646 syscall(ffff800020baf130) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020baf130) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,7f7ffffdb428,0,1,7f7ffffdb438) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffdb3c0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic malloc: allocation too large, type = 2, size = 3462255744 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x174 sys/kern/subr_prf.c:208 malloc(ce5dd480,2,2) at malloc+0xa6f sys/kern/kern_malloc.c:339 wsmux_getmux(19cbba8f) at wsmux_getmux+0x71 sys/dev/wscons/wsmux.c:139 wsmux_do_ioctl(ffff80000069ea00,80085761,ffff800020baef50,f,ffff800020b952d0) at wsmux_do_ioctl+0x29e wsmux_add_mux sys/dev/wscons/wsmux.c:579 [inline] wsmux_do_ioctl(ffff80000069ea00,80085761,ffff800020baef50,f,ffff800020b952d0) at wsmux_do_ioctl+0x29e sys/dev/wscons/wsmux.c:432 VOP_IOCTL(fffffd806dc943f0,80085761,ffff800020baef50,f,fffffd807f7c7c60,ffff800020b952d0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd806fcae000,80085761,ffff800020baef50,ffff800020b952d0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b952d0,ffff800020baf098,ffff800020baf080) at sys_ioctl+0x646 syscall(ffff800020baf130) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020baf130) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,7f7ffffdb428,0,1,7f7ffffdb438) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffdb3c0, count: -10 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020baeae0 rbx 0xffff800020baeb90 rdx 0xffffffff81f52f17 apollo_pio_rec+0xa34b rcx 0x201 rax 0x1 r8 0xffffffff81316553 kprintf+0x183 r9 0x1 r10 0x6622ea658ae1a5a4 r11 0x80862c2d27170396 r12 0x3000000008 r13 0xffff800020baeaf0 r14 0x100 r15 0x1 rip 0xffffffff81264218 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020baead0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor5947) pid=238102 stat=onproc flags process=2 proc=0 pri=53, usrpri=53, nice=20 forw=0xffffffffffffffff, list=0xffff800020b944c0,0xffffffff82334d38 process=0xffff800020b7a9f0 user=0xffff800020baa000, vmspace=0xfffffd806e96f5a8 estcpu=3, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND * 451 238102 40473 0 7 0x2 syz-executor5947 40473 342080 6160 0 3 0x10008a pause ksh 6160 97041 11171 0 3 0x92 select sshd 96887 364862 1 0 3 0x100083 ttyin getty 11171 324338 1 0 3 0x80 select sshd 46359 73016 59667 73 3 0x100090 kqread syslogd 59667 217043 1 0 3 0x100082 netio syslogd 85598 109612 1 77 3 0x100090 poll dhclient 34954 267295 1 0 3 0x80 poll dhclient 20177 480661 0 0 3 0x14200 pgzero zerothread 87275 286348 0 0 3 0x14200 aiodoned aiodoned 19324 315280 0 0 3 0x14200 syncer update 83090 417733 0 0 3 0x14200 cleaner cleaner 60913 460744 0 0 3 0x14200 reaper reaper 17796 472361 0 0 3 0x14200 pgdaemon pagedaemon 315 359712 0 0 3 0x14200 bored crynlk 69728 160737 0 0 3 0x14200 bored crypto 4673 396320 0 0 3 0x40014200 acpi0 acpi0 44075 404219 0 0 7 0x40014200 idle1 93285 142819 0 0 3 0x14200 bored softnet 67027 13923 0 0 3 0x14200 bored systqmp 31919 321243 0 0 3 0x14200 bored systq 487 423675 0 0 3 0x40014200 bored softclock 36683 70859 0 0 3 0x40014200 idle0 1 381705 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 451 (syz-executor5947) thread 0xffff800020b952d0 (238102) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8235c720) locked @ /syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 syscall+0x47f mi_syscall sys/sys/syscall_mi.h:91 [inline] #1 syscall+0x47f sys/arch/amd64/amd64/trap.c:574 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9444 6323K 6323K 78643K 10532 0 0 pcb 23 9K 9K 78643K 55 0 0 rtable 61 2K 2K 78643K 115 0 0 ifaddr 21 7K 7K 78643K 21 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 13 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1167 73K 73K 78643K 1172 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 2 0K 0K 78643K 2 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 1 0K 0K 78643K 1 0 0 proc 40 38K 46K 78643K 207 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 11 0K 0K 78643K 11 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 18 79K 79K 78643K 18 0 0 exec 0 0K 1K 78643K 150 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 47 2K 3K 78643K 651 0 0 UVM aobj 2 2K 2K 78643K 2 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 NDP 3 0K 0K 78643K 3 0 0 temp 30 2347K 2411K 78643K 1695 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 2 0 0 1 0 1 1 0 8 0 inpcbpl 280 22 0 14 1 0 1 1 0 8 0 plimitpl 152 13 0 8 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 syncache 264 5 0 5 1 0 1 1 0 8 1 tcpqe 32 2 0 2 1 0 1 1 0 8 1 tcpcb 544 8 0 3 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1383 0 17 45 0 45 45 0 8 0 ffsino 272 1383 0 17 92 0 92 92 0 8 0 nchpl 144 1555 0 30 57 0 57 57 0 8 0 uvmvnodes 72 1392 0 0 26 0 26 26 0 8 0 vnodes 200 1392 0 0 74 0 74 74 0 8 0 namei 1024 3262 0 3262 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 2350 0 2350 8 3 5 6 0 8 5 sigapl 432 174 0 164 2 0 2 2 0 8 0 knotepl 112 5 0 0 1 0 1 1 0 8 0 kqueuepl 104 1 0 0 1 0 1 1 0 8 0 pipepl 112 114 0 107 2 1 1 1 0 8 0 fdescpl 488 175 0 164 2 0 2 2 0 8 0 filepl 152 808 0 765 2 0 2 2 0 8 0 lockfpl 104 6 0 6 1 1 0 1 0 8 0 lockfspl 32 3 0 3 1 1 0 1 0 8 0 sessionpl 112 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 96 47 0 40 1 0 1 1 0 8 0 zombiepl 144 164 0 164 2 1 1 1 0 8 1 processpl 840 189 0 164 4 0 4 4 0 8 0 procpl 600 189 0 164 3 0 3 3 0 8 0 sockpl 384 64 0 46 2 0 2 2 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 67 0 0 9 0 9 9 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 86 0 0 6 0 6 6 0 8 0 bufpl 256 1998 0 254 109 0 109 109 0 8 0 anonpl 16 16861 0 15782 6 1 5 6 0 125 0 amapchunkpl 152 487 0 452 2 0 2 2 0 158 0 amappl16 192 68 0 63 1 0 1 1 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 1 0 1 1 1 0 1 0 8 0 amappl13 168 15 0 12 1 0 1 1 0 8 0 amappl12 160 7 0 7 1 1 0 1 0 8 0 amappl11 152 173 0 164 1 0 1 1 0 8 0 amappl10 144 44 0 43 1 0 1 1 0 8 0 amappl9 136 58 0 57 1 0 1 1 0 8 0 amappl8 128 102 0 96 1 0 1 1 0 8 0 amappl7 120 29 0 25 1 0 1 1 0 8 0 amappl6 112 40 0 35 1 0 1 1 0 8 0 amappl5 104 436 0 425 1 0 1 1 0 8 0 amappl4 96 265 0 243 1 0 1 1 0 8 0 amappl3 88 115 0 110 1 0 1 1 0 8 0 amappl2 80 566 0 532 1 0 1 1 0 8 0 amappl1 72 11778 0 11396 14 4 10 14 0 8 0 amappl 72 365 0 346 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 175 0 164 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 175 0 164 1 0 1 1 0 8 0 vmmpekpl 168 5123 0 5103 1 0 1 1 0 8 0 vmmpepl 168 23571 0 22887 51 18 33 43 0 357 1 vmsppl 360 174 0 164 2 0 2 2 0 8 0 pdppl 4096 357 0 328 5 0 5 5 0 8 0 pvpl 32 69535 0 66834 30 4 26 26 0 265 1 pmappl 224 174 0 164 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 237 0 3 7 0 7 7 0 8 0 ddb{0}>