panic: Data modified on freelist: word 4 of object 0xffff8000014f1880 size 0x30 previous type free (0x0 != 0xdeafbead) Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 337325 12207 0 0 0x4000000 0K syz-executor *372918 36224 0 0x2 0 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83373cbb) at panic+0x1e5 sys/kern/subr_prf.c:198 malloc(30,7f,9) at malloc+0xdb6 sys/kern/kern_malloc.c:355 dopselect(ffff80002a262540,32,7cabda3900c0,0,0,ffff80002a2d6b10,12592ec1b4141f85,ffff80002a2d6bb0) at dopselect+0xe4 sys/kern/sys_generic.c:615 sys_pselect(ffff80002a262540,ffff80002a2d6c60,ffff80002a2d6bb0) at sys_pselect+0x25a sys/kern/sys_generic.c:589 syscall(ffff80002a2d6c60) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2d6c60) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cabda390070, count: 8 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 *cpu1: Data modified on freelist: word 4 of object 0xffff8000014f1880 size 0x30 previous type free (0x0 != 0xdeafbead) ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83373cbb) at panic+0x1e5 sys/kern/subr_prf.c:198 malloc(30,7f,9) at malloc+0xdb6 sys/kern/kern_malloc.c:355 dopselect(ffff80002a262540,32,7cabda3900c0,0,0,ffff80002a2d6b10,12592ec1b4141f85,ffff80002a2d6bb0) at dopselect+0xe4 sys/kern/sys_generic.c:615 sys_pselect(ffff80002a262540,ffff80002a2d6c60,ffff80002a2d6bb0) at sys_pselect+0x25a sys/kern/sys_generic.c:589 syscall(ffff80002a2d6c60) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2d6c60) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cabda390070, count: -7 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a2d6630 rbx 0xffff8000299dee07 rdx 0 rcx 0xffff80002a262540 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x3dff08607509de40 r11 0x6bdbe1a2d7b9ac78 r12 0xffff8000299dec08 r13 0 r14 0 r15 0x1 rip 0xffffffff827061d5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a2d6620 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=372918 pid=36224 tcnt=1 stat=onproc flags process=2 proc=0 runpri=50, usrpri=50, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a262a70,0xffff8000ffffcfa8 process=0xffff80002a2679d0 user=0xffff80002a2d1000, vmspace=0xfffffd806ec4db80 estcpu=0, cpticks=21, pctcpu=0.14, user=1, sys=19, intr=1 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 48945 28015 3172 0 2 0 syz-executor 75482 468672 87786 0 2 0 syz-executor 75482 118319 87786 0 3 0x4000080 ttyout syz-executor 12207 523200 83445 0 2 0 syz-executor 12207 411009 83445 0 3 0x4000080 kqsel syz-executor 12207 176405 83445 0 3 0x4000080 fsleep syz-executor 12207 337325 83445 0 7 0x4000000 syz-executor 53794 341096 7244 0 2 0 syz-executor 53794 102322 7244 0 3 0x4000080 fsleep syz-executor 53794 480602 7244 0 2 0x4000000 syz-executor 90808 399426 49318 0 2 0 syz-executor 90808 212089 49318 0 3 0x4000080 lockf syz-executor 90808 412228 49318 0 3 0x4000080 lockf syz-executor 41743 236119 67873 0 3 0x3000 suspend syz-executor 41743 344425 67873 0 3 0x4081000 biowait syz-executor 41743 25832 67873 0 3 0x4081000 inode syz-executor 41743 191076 67873 0 3 0x4081000 inode syz-executor 67873 364877 36224 0 3 0x82 nanoslp syz-executor 7244 364125 36224 0 3 0x82 nanoslp syz-executor 48250 256979 36224 0 3 0x82 nanoslp syz-executor 3172 265967 36224 0 3 0x82 nanoslp syz-executor 87786 496406 36224 0 3 0x82 nanoslp syz-executor 49318 226278 36224 0 3 0x82 nanoslp syz-executor 76031 375468 36224 0 3 0x82 nanoslp syz-executor 83445 295709 36224 0 3 0x82 nanoslp syz-executor *36224 372918 81665 0 7 0x2 syz-executor 81665 389797 40708 0 3 0x10008a sigsusp ksh 40708 272828 95975 0 3 0x98 kqread sshd-session 95975 485176 66064 0 3 0x92 kqread sshd-session 62771 459035 1 0 3 0x100083 ttyin getty 66064 423867 1 0 3 0x88 kqread sshd 32933 443899 69198 74 3 0x1100092 bpf pflogd 69198 471720 1 0 3 0x80 sbwait pflogd 14378 175245 35289 73 3 0x1100090 kqread syslogd 35289 385729 1 0 3 0x100082 sbwait syslogd 86289 330526 1 0 3 0x100080 kqread resolvd 926 463499 73427 77 3 0x100092 kqread dhcpleased 40605 290764 73427 77 3 0x100092 kqread dhcpleased 73427 127207 1 0 3 0x80 kqread dhcpleased 93529 402343 0 0 3 0x14200 bored smr 46773 4628 0 0 3 0x14200 pgzero zerothread 95286 271686 0 0 3 0x14200 aiodoned aiodoned 80619 278447 0 0 3 0x14200 syncer update 47079 27773 0 0 3 0x14200 cleaner cleaner 28235 404695 0 0 3 0x14200 reaper reaper 27247 224352 0 0 3 0x14200 pgdaemon pagedaemon 41203 163113 0 0 3 0x14200 bored viomb 89908 479423 0 0 3 0x40014200 acpi0 acpi0 29159 392104 0 0 3 0x40014200 idle1 28048 139279 0 0 3 0x14200 bored softnet1 98861 197688 0 0 3 0x14200 bored softnet0 22158 57272 0 0 3 0x14200 bored systqmp 81951 413880 0 0 3 0x14200 bored systq 66478 13724 0 0 3 0x14200 tmoslp softclockmp 85611 95823 0 0 3 0x40014200 tmoslp softclock 12708 260819 0 0 3 0x40014200 idle0 1 146071 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex /syzkaller/managers/multicore/kernel/sys/kern/kern_malloc.c:96 r = 0 (0xffffffff8381f208) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 malloc+0x2ed sys/kern/kern_malloc.c:200 #3 dopselect+0xe4 sys/kern/sys_generic.c:615 #4 sys_pselect+0x25a sys/kern/sys_generic.c:589 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #6 Xsyscall+0x128 Process 12207 (syz-executor) thread 0xffff8000fffec020 (337325) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83983188) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 malloc+0xe3 sys/kern/kern_malloc.c:175 #3 checkalias+0x21c sys/kern/vfs_subr.c:594 #4 cdevvp+0xd2 getdevvp sys/kern/vfs_subr.c:-1 [inline] #4 cdevvp+0xd2 sys/kern/vfs_subr.c:517 #5 spec_open_clone+0x1e2 sys/kern/spec_vnops.c:713 #6 spec_open+0x319 sys/kern/spec_vnops.c:148 #7 VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 #8 vn_open+0x6a0 sys/kern/vfs_vnops.c:177 #9 doopenat+0x35b sys/kern/vfs_syscalls.c:1138 #10 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8072432eb0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 cache_lookup+0x351 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #10 namei+0x7ca sys/kern/vfs_lookup.c:250 #11 vn_open+0x15a sys/kern/vfs_vnops.c:140 #12 doopenat+0x35b sys/kern/vfs_syscalls.c:1138 #13 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #14 Xsyscall+0x128 Process 41743 (syz-executor) thread 0xffff8000fffed4e0 (344425) exclusive rrwlock inode r = 0 (0xfffffd806eabf9e0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 41743 (syz-executor) thread 0xffff8000fffed778 (25832) exclusive rrwlock inode r = 0 (0xfffffd806b90b8f8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 vn_open+0x1f1 sys/kern/vfs_vnops.c:107 #8 doopenat+0x35b sys/kern/vfs_syscalls.c:1138 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #10 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10197 11025K 11431K 166960K 11612 0 pcb 17 14K 16K 166960K 166 0 rtable 209 8K 8K 166960K 412 0 pf 33 17K 21K 166960K 84 0 ifaddr 39 6K 7K 166960K 60 0 ifgroup 51 2K 2K 166960K 88 0 sysctl 3 1K 9K 166960K 7 0 counters 68 36K 37K 166960K 100 0 ioctlops 0 0K 4K 166960K 1557 0 iov 1 0K 16K 166960K 13 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1434 90K 91K 166960K 1614 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 7 0K 0K 166960K 7 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 325 0 sigio 0 0K 0K 166960K 5 0 proc 72 115K 164K 166960K 546 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 6 0 in_multi 91 6K 7K 166960K 110 0 ether_multi 1 0K 0K 166960K 3 0 mrt 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 429 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 246 168K 178K 166960K 4795 0 UVM aobj 9 4K 6K 166960K 11 0 pinsyscall 43 86K 107K 166960K 1449 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 9 0 NDP 12 0K 2K 166960K 40 0 temp 64 8677K 8741K 166960K 10210 0 kqueue 14 22K 28K 166960K 61 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 46 0 43 1 0 1 1 0 8 0 rtentry 176 122 0 35 6 1 5 6 0 8 0 unpcb 144 205 0 188 5 4 1 4 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpcb 736 113 0 109 7 6 1 7 0 8 0 arp 136 20 0 6 1 0 1 1 0 8 0 inpcb 328 401 0 394 7 6 1 7 0 8 0 nd6 152 24 0 3 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 12 0 12 2 1 1 1 0 8 1 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 3 0 1 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfrktable 1344 4 0 4 1 1 0 1 0 8 0 pfanchor 1288 3 0 3 1 1 0 1 0 8 0 pfstitem 24 32 0 0 1 0 1 1 0 8 0 pfstkey 128 34 0 2 2 0 2 2 0 8 0 pfstate 448 32 0 1 4 0 4 4 0 8 0 pfrule 1344 24 0 19 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 534 0 119 31 4 27 30 0 8 0 art_table 40 536 0 119 5 0 5 5 0 8 0 art_node 32 121 0 43 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0 semapl 112 5 0 0 1 0 1 1 0 8 0 shmpl 112 8 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1905 0 396 96 0 96 96 0 8 0 ffsino 296 1905 0 396 117 0 117 117 0 8 0 nchpl 144 2375 0 672 64 0 64 64 0 8 0 rtmask 32 4 0 4 2 2 0 1 0 8 0 vnodes 216 2182 0 0 122 0 122 122 0 8 0 namei 1024 8011 0 8009 1 0 1 1 0 8 0 percpumem 16 65 0 16 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 1 1 1 0 1 0 8 0 kstatmem 264 48 0 24 3 0 3 3 0 8 1 scxspl 216 11228 0 11227 3 2 1 2 1 8 0 plimitpl 152 104 0 85 1 0 1 1 0 8 0 sigapl 424 633 0 585 7 1 6 7 0 8 0 knotepl 120 534 0 0 17 0 17 17 0 8 0 kqueuepl 224 101 0 90 2 0 2 2 0 8 0 pipepl 344 142 0 115 3 0 3 3 0 8 0 fdescpl 528 617 0 585 3 0 3 3 0 8 0 filepl 160 3221 0 2996 15 4 11 13 0 8 0 lockfpl 104 168 0 163 2 1 1 2 0 8 0 lockfspl 48 71 0 68 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 32 0 15 1 0 1 1 0 8 0 ucredpl 104 320 0 305 1 0 1 1 0 8 0 zombiepl 144 591 0 588 1 0 1 1 0 8 0 processpl 1232 633 0 585 5 0 5 5 0 8 0 procpl 664 996 0 937 6 0 6 6 0 8 0 sosppl 176 4 0 4 1 1 0 1 0 8 0 sockpl 752 660 0 633 16 12 4 11 0 8 1 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 130 0 0 17 0 17 17 0 8 0 mcl2k 2048 32 0 0 4 0 4 4 0 8 0 mtagpl 96 44 0 0 2 0 2 2 0 8 0 mbufpl 256 1188 0 0 75 0 75 75 0 8 0 bufpl 280 4427 0 131 307 0 307 307 0 8 0 anonpl 32 9636 0 0 78 0 78 78 0 246 0 amapchunkpl 152 14804 0 14299 37 12 25 28 0 158 4 amappl16 200 2757 0 2564 20 9 11 14 0 8 0 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 54 0 54 1 1 0 1 0 8 0 amappl13 176 424 0 423 1 0 1 1 0 8 0 amappl12 168 975 0 933 3 0 3 3 0 8 0 amappl11 160 20 0 20 1 1 0 1 0 8 0 amappl10 152 60 0 46 1 0 1 1 0 8 0 amappl9 144 255 0 255 1 1 0 1 0 8 0 amappl8 136 31 0 28 1 0 1 1 0 8 0 amappl7 128 83 0 81 1 0 1 1 0 8 0 amappl6 120 276 0 263 1 0 1 1 0 8 0 amappl5 112 77 0 66 1 0 1 1 0 8 0 amappl4 104 406 0 376 1 0 1 1 0 8 0 amappl3 96 2619 0 2506 5 1 4 4 0 8 0 amappl2 88 519 0 460 2 0 2 2 0 8 0 amappl1 80 9972 0 9364 15 2 13 15 0 8 0 amappl 88 4039 0 3871 5 0 5 5 0 92 0 uvmvnodes 80 101 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 10 0 2 1 0 1 1 0 8 0 uaddrrnd 24 617 0 585 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 617 0 585 1 0 1 1 0 8 0 vmmpekpl 168 6737 0 6706 2 0 2 2 0 8 0 vmmpepl 168 47682 0 45549 104 10 94 98 0 357 0 vmsppl 488 616 0 585 5 1 4 5 0 8 0 rwobjpl 80 16293 0 15083 29 3 26 27 0 8 0 pdppl 4096 1241 0 1170 99 28 71 85 0 8 0 pvpl 32 17073 0 0 138 0 138 138 0 265 0 pmappl 256 616 0 585 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 348 0 41 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8384fff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 mtx_enter(ffffffff8381f1f8) at mtx_enter+0x377 sys/kern/kern_lock.c:454 malloc(38,19,1) at malloc+0x2ed sys/kern/kern_malloc.c:200 checkalias(fffffd806b917608,24900,0) at checkalias+0x21c sys/kern/vfs_subr.c:594 cdevvp(24900,ffff80003c450d00) at cdevvp+0xd2 getdevvp sys/kern/vfs_subr.c:-1 [inline] cdevvp(24900,ffff80003c450d00) at cdevvp+0xd2 sys/kern/vfs_subr.c:517 spec_open_clone(ffff80003c450dd8) at spec_open_clone+0x1e2 sys/kern/spec_vnops.c:713 spec_open(ffff80003c450dd8) at spec_open+0x319 sys/kern/spec_vnops.c:148 VOP_OPEN(fffffd80724337c0,3,fffffd80097fd680,ffff8000fffec020) at VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 vn_open(ffff80003c451020,3,0) at vn_open+0x6a0 sys/kern/vfs_vnops.c:177 doopenat(ffff8000fffec020,ffffff9c,200000000200,2,0,ffff80003c4511d0) at doopenat+0x35b sys/kern/vfs_syscalls.c:1138 syscall(ffff80003c451280) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c451280) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xecce4df0520, count: 1 ddb{0}> trace x86_ipi_db(ffffffff8384fff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 mtx_enter(ffffffff8381f1f8) at mtx_enter+0x377 sys/kern/kern_lock.c:454 malloc(38,19,1) at malloc+0x2ed sys/kern/kern_malloc.c:200 checkalias(fffffd806b917608,24900,0) at checkalias+0x21c sys/kern/vfs_subr.c:594 cdevvp(24900,ffff80003c450d00) at cdevvp+0xd2 getdevvp sys/kern/vfs_subr.c:-1 [inline] cdevvp(24900,ffff80003c450d00) at cdevvp+0xd2 sys/kern/vfs_subr.c:517 spec_open_clone(ffff80003c450dd8) at spec_open_clone+0x1e2 sys/kern/spec_vnops.c:713 spec_open(ffff80003c450dd8) at spec_open+0x319 sys/kern/spec_vnops.c:148 VOP_OPEN(fffffd80724337c0,3,fffffd80097fd680,ffff8000fffec020) at VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 vn_open(ffff80003c451020,3,0) at vn_open+0x6a0 sys/kern/vfs_vnops.c:177 doopenat(ffff8000fffec020,ffffff9c,200000000200,2,0,ffff80003c4511d0) at doopenat+0x35b sys/kern/vfs_syscalls.c:1138 syscall(ffff80003c451280) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c451280) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xecce4df0520, count: -14 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83373cbb) at panic+0x1e5 sys/kern/subr_prf.c:198 malloc(30,7f,9) at malloc+0xdb6 sys/kern/kern_malloc.c:355 dopselect(ffff80002a262540,32,7cabda3900c0,0,0,ffff80002a2d6b10,12592ec1b4141f85,ffff80002a2d6bb0) at dopselect+0xe4 sys/kern/sys_generic.c:615 sys_pselect(ffff80002a262540,ffff80002a2d6c60,ffff80002a2d6bb0) at sys_pselect+0x25a sys/kern/sys_generic.c:589 syscall(ffff80002a2d6c60) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2d6c60) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cabda390070, count: 8 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83373cbb) at panic+0x1e5 sys/kern/subr_prf.c:198 malloc(30,7f,9) at malloc+0xdb6 sys/kern/kern_malloc.c:355 dopselect(ffff80002a262540,32,7cabda3900c0,0,0,ffff80002a2d6b10,12592ec1b4141f85,ffff80002a2d6bb0) at dopselect+0xe4 sys/kern/sys_generic.c:615 sys_pselect(ffff80002a262540,ffff80002a2d6c60,ffff80002a2d6bb0) at sys_pselect+0x25a sys/kern/sys_generic.c:589 syscall(ffff80002a2d6c60) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2d6c60) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cabda390070, count: -7