panic: vop_genericp_anbaidc:o p kStopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 186383 93683 32767 0x10 0x4000000 1 syz-executor.5 *459084 7894 32767 0x10 0 0 syz-executor.2 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82591c2e) at panic+0x177 sys/kern/subr_prf.c:202 vop_generic_badop(ffff8000246b1e48) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133 VOP_STRATEGY(fffffd8067ea8b20,fffffd80750ea250) at VOP_STRATEGY+0x9b sys/kern/vfs_vops.c:644 bwrite(fffffd80750ea250) at bwrite+0x1f0 sys/kern/vfs_bio.c:763 VOP_BWRITE(fffffd80750ea250) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:656 ufs_mkdir(ffff8000246b20e0) at ufs_mkdir+0x6b4 sys/ufs/ufs/ufs_vnops.c:1248 VOP_MKDIR(fffffd8078ad9170,ffff8000246b2240,ffff8000246b2270,ffff8000246b2170) at VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 domkdirat(ffff80002346c7e8,ffffff9c,7f7ffffc83b0,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:3116 syscall(ffff8000246b23f0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000246b23f0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc8420, count: 4 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 *cpu0: vop_generic_badop cpu1: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_fork.c", line 678 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82591c2e) at panic+0x177 sys/kern/subr_prf.c:202 vop_generic_badop(ffff8000246b1e48) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133 VOP_STRATEGY(fffffd8067ea8b20,fffffd80750ea250) at VOP_STRATEGY+0x9b sys/kern/vfs_vops.c:644 bwrite(fffffd80750ea250) at bwrite+0x1f0 sys/kern/vfs_bio.c:763 VOP_BWRITE(fffffd80750ea250) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:656 ufs_mkdir(ffff8000246b20e0) at ufs_mkdir+0x6b4 sys/ufs/ufs/ufs_vnops.c:1248 VOP_MKDIR(fffffd8078ad9170,ffff8000246b2240,ffff8000246b2270,ffff8000246b2170) at VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 domkdirat(ffff80002346c7e8,ffffff9c,7f7ffffc83b0,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:3116 syscall(ffff8000246b23f0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000246b23f0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc8420, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000246b1d70 rbx 0xffffffff8291dc5f cpu_info_full_primary+0x2c5f rdx 0 rcx 0 rax 0xffff80002346c7e8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x959e7dd67851d63e r11 0xc0e35f5c6e377693 r12 0xffffffff8291da60 cpu_info_full_primary+0x2a60 r13 0 r14 0 r15 0x1 rip 0xffffffff8109ef08 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000246b1d60 ss 0 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.2) pid=459084 stat=onproc flags process=10 proc=0 pri=17, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002346cfc8,0xffff80002346c558 process=0xffff8000ffff0c88 user=0xffff8000246ad000, vmspace=0xfffffd806c8882f0 estcpu=36, cpticks=2, pctcpu=0.17 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 7484 270775 85042 32767 2 0x10 syz-executor.3 93683 246085 83138 32767 2 0x10 syz-executor.5 93683 294904 83138 32767 2 0x4000010 syz-executor.5 93683 186383 83138 32767 7 0x4000010 syz-executor.5 88645 357520 35030 32767 2 0x10 syz-executor.7 88645 268266 35030 32767 3 0x4000090 fsleep syz-executor.7 88645 6891 35030 32767 3 0x4000090 fsleep syz-executor.7 48268 287497 34065 32767 2 0x490 syz-executor.1 48268 110645 34065 32767 3 0x4000090 fsleep syz-executor.1 48268 180518 34065 32767 3 0x4000090 fsleep syz-executor.1 48268 305830 34065 32767 3 0x4000090 fsleep syz-executor.1 17248 435116 45264 32767 2 0x10 syz-executor.6 17248 178355 45264 32767 2 0x4000010 syz-executor.6 17248 189108 45264 32767 3 0x4000090 kqread syz-executor.6 17248 143458 45264 32767 3 0x4000090 fsleep syz-executor.6 83138 292341 45569 32767 3 0x90 nanoslp syz-executor.5 45569 149352 56847 0 3 0x82 wait syz-executor.5 45264 32413 39042 32767 3 0x90 nanoslp syz-executor.6 39042 463698 56847 0 3 0x82 wait syz-executor.6 35030 6382 25694 32767 3 0x90 nanoslp syz-executor.7 25694 396684 56847 0 3 0x82 wait syz-executor.7 58340 291040 0 0 3 0x14200 bored sosplice 85042 181475 72 32767 2 0x10 syz-executor.3 71524 35089 61216 32767 2 0x10 syz-executor.4 * 7894 459084 6044 32767 7 0x10 syz-executor.2 61216 162046 56847 0 3 0x82 wait syz-executor.4 34065 315045 7905 32767 2 0x490 syz-executor.1 72 419714 56847 0 3 0x82 wait syz-executor.3 6044 32098 56847 0 3 0x82 wait syz-executor.2 7905 490868 56847 0 3 0x82 wait syz-executor.1 56847 47302 49009 0 3 0x82 thrsleep syz-fuzzer 56847 400899 49009 0 3 0x4000082 nanoslp syz-fuzzer 56847 331916 49009 0 3 0x4000082 thrsleep syz-fuzzer 56847 402154 49009 0 3 0x4000082 thrsleep syz-fuzzer 56847 371622 49009 0 3 0x4000082 thrsleep syz-fuzzer 56847 402954 49009 0 3 0x4000082 kqread syz-fuzzer 56847 201869 49009 0 3 0x4000082 thrsleep syz-fuzzer 56847 94313 49009 0 3 0x4000082 thrsleep syz-fuzzer 56847 209199 49009 0 3 0x4000082 thrsleep syz-fuzzer 56847 25064 49009 0 3 0x4000082 thrsleep syz-fuzzer 49009 282802 32876 0 3 0x10008a sigsusp ksh 32876 344657 35586 0 3 0x9a kqread sshd 30059 137972 1 0 3 0x100083 ttyin getty 35586 18492 1 0 3 0x88 kqread sshd 74772 356563 61156 73 3 0x1100090 kqread syslogd 61156 140239 1 0 3 0x100082 netio syslogd 5606 389551 1 0 3 0x100080 kqread resolvd 31186 450794 61302 77 3 0x100092 kqread dhcpleased 64734 307113 61302 77 3 0x100092 kqread dhcpleased 61302 504091 1 0 3 0x80 kqread dhcpleased 62420 37575 0 0 3 0x14200 bored smr 16523 171290 0 0 2 0x14200 zerothread 65935 524284 0 0 3 0x14200 aiodoned aiodoned 88274 161645 0 0 3 0x14200 syncer update 20565 31505 0 0 3 0x14200 cleaner cleaner 23702 194654 0 0 3 0x14200 reaper reaper 21087 477120 0 0 3 0x14200 pgdaemon pagedaemon 60066 451397 0 0 3 0x14200 bored viomb 86723 74165 0 0 3 0x40014200 acpi0 acpi0 28682 105714 0 0 3 0x40014200 idle1 89468 144623 0 0 3 0x14200 bored softnet 96244 247285 0 0 3 0x14200 bored softnet 35968 72379 0 0 3 0x14200 bored softnet 74467 304174 0 0 3 0x14200 bored softnet 74970 152545 0 0 3 0x14200 bored systqmp 44314 501130 0 0 3 0x14200 bored systq 77234 160351 0 0 2 0x40014200 softclock 73288 39111 0 0 3 0x40014200 idle0 1 487849 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 7894 (syz-executor.2) thread 0xffff80002346c7e8 (459084) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82a84158) #0 witness_lock+0x44d #1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 #2 mi_switch+0x3d3 sys/kern/sched_bsd.c:416 #3 sleep_finish+0x180 sys/kern/kern_synch.c:420 #4 tsleep+0x12c sys/kern/kern_synch.c:158 #5 biowait+0x91 sys/kern/vfs_bio.c:1271 #6 bwrite+0x21b sys/kern/vfs_bio.c:772 #7 ffs_update+0x27d sys/ufs/ffs/ffs_inode.c:113 #8 ufs_mkdir+0x662 sys/ufs/ufs/ufs_vnops.c:1232 #9 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 #10 domkdirat+0x121 sys/kern/vfs_syscalls.c:3116 #11 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #11 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #12 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c8fdb48) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vget+0x1d3 sys/kern/vfs_subr.c:678 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1318 #8 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #9 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #10 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 #11 domkdirat+0x121 sys/kern/vfs_syscalls.c:3116 #12 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #12 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #13 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c0d6808) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3101 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10198 6409K 6420K 78643K 11307 0 pcb 13 12K 14K 78643K 17 0 rtable 218 6K 7K 78643K 631 0 ifaddr 74 16K 17K 78643K 118 0 sysctl 2 0K 0K 78643K 2 0 counters 54 35K 35K 78643K 66 0 ioctlops 0 0K 2K 78643K 59 0 iov 0 0K 20K 78643K 887 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1271 79K 79K 78643K 2169 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 55 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 5348 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 21 77K 113K 78643K 5856 0 sigio 0 0K 0K 78643K 392 0 proc 56 78K 103K 78643K 955 0 subproc 91 5K 6K 78643K 169 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 2597 0 in_multi 88 5K 7K 78643K 216 0 ether_multi 1 0K 0K 78643K 21 0 mrt 1 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 205 917K 917K 78643K 205 0 exec 0 0K 2K 78643K 2388 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 269 76K 97K 78643K 36574 0 UVM aobj 131 4K 4K 78643K 160 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 93 0 NDP 10 0K 2K 78643K 42 0 temp 116 4733K 4862K 78643K 16345 0 kqueue 12 18K 28K 78643K 410 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 560 0 557 10 9 1 4 0 8 0 rtentry 112 170 0 68 4 0 4 4 0 8 0 unpcb 136 3035 0 2988 31 29 2 8 0 8 0 syncache 296 67 0 67 13 12 1 1 0 8 1 tcpqe 32 9 0 9 3 3 0 1 0 8 0 tcpcb 736 2205 0 2188 87 78 9 15 0 8 7 arp 120 29 0 13 1 0 1 1 0 8 0 inpcb 312 11368 0 11351 91 82 9 14 0 8 7 ip6q 72 3 0 3 1 1 0 1 0 8 0 ip6af 40 9 0 9 1 1 0 1 0 8 0 nd6 48 42 0 18 1 0 1 1 0 8 0 kcovpl 48 13 0 6 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 699 0 265 30 0 30 30 0 8 2 art_table 32 700 0 265 4 0 4 4 0 8 0 art_node 16 169 0 76 1 0 1 1 0 8 0 sysvmsgpl 40 44 0 4 1 0 1 1 0 8 0 semapl 112 5346 0 5336 1 0 1 1 0 8 0 shmpl 112 157 0 29 5 1 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 8663 0 7225 91 0 91 91 0 8 0 ffsino 272 8663 0 7225 97 0 97 97 0 8 0 nchpl 144 15975 0 14346 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 51419 0 51418 2 1 1 2 0 8 0 percpumem 16 45 0 6 1 0 1 1 0 8 0 kstatmem 264 32 0 12 2 0 2 2 0 8 0 scxspl 216 47027 0 47027 23 22 1 8 0 8 1 plimitpl 152 787 0 767 3 2 1 2 0 8 0 sigapl 424 6125 0 6075 7 0 7 7 0 8 0 futexpl 64 61849 0 61843 1 0 1 1 0 8 0 knotepl 120 600 0 0 12 1 11 11 0 8 0 kqueuepl 216 1645 0 1572 34 29 5 7 0 8 0 pipepl 336 2141 0 2116 54 48 6 8 0 8 3 fdescpl 496 6107 0 6075 7 2 5 6 0 8 0 filepl 152 41074 0 40609 96 78 18 20 0 8 0 lockfpl 104 708 0 706 1 0 1 1 0 8 0 lockfspl 48 194 0 192 1 0 1 1 0 8 0 sessionpl 144 28 0 13 1 0 1 1 0 8 0 pgrppl 48 53 0 38 1 0 1 1 0 8 0 ucredpl 96 5464 0 5447 1 0 1 1 0 8 0 zombiepl 144 6075 0 6075 1 0 1 1 0 8 1 processpl 1064 6125 0 6075 4 0 4 4 0 8 0 procpl 672 17461 0 17392 17 9 8 8 0 8 2 sosppl 168 83 0 83 7 7 0 1 0 8 0 sockpl 480 15204 0 15137 261 250 11 32 0 8 2 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 15 0 0 2 0 2 2 0 8 0 mcl12k 12288 26 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 34 0 0 5 2 3 3 0 8 0 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 12 0 0 1 0 1 1 0 8 0 mcl2k 2048 206 0 0 20 0 20 20 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 794 0 0 42 0 42 42 0 8 0 bufpl 288 13174 0 6843 453 0 453 453 0 8 0 anonpl 24 1181440 0 1170624 177 81 96 103 0 186 11 amapchunkpl 152 106416 0 105834 62 33 29 37 0 158 0 amappl16 200 16687 0 16344 72 41 31 31 0 8 10 amappl15 192 2097 0 2093 1 0 1 1 0 8 0 amappl14 184 721 0 716 1 0 1 1 0 8 0 amappl13 176 808 0 804 1 0 1 1 0 8 0 amappl12 168 260 0 259 1 0 1 1 0 8 0 amappl11 160 1150 0 1135 1 0 1 1 0 8 0 amappl10 152 56 0 50 1 0 1 1 0 8 0 amappl9 144 544 0 542 1 0 1 1 0 8 0 amappl8 136 1725 0 1629 4 0 4 4 0 8 0 amappl7 128 1071 0 1053 1 0 1 1 0 8 0 amappl6 120 318 0 295 2 1 1 2 0 8 0 amappl5 112 4606 0 4584 1 0 1 1 0 8 0 amappl4 104 3121 0 3097 2 1 1 2 0 8 0 amappl3 96 18695 0 18646 2 0 2 2 0 8 0 amappl2 88 7554 0 7486 3 1 2 3 0 8 0 amappl1 80 148616 0 147958 25 8 17 19 0 8 1 amappl 88 35843 0 35684 6 1 5 5 0 92 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 72 159 0 29 3 0 3 3 0 8 0 uaddrrnd 24 6107 0 6075 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6107 0 6075 1 0 1 1 0 8 0 vmmpekpl 168 54884 0 54838 3 0 3 3 0 8 0 vmmpepl 168 597702 0 595181 196 66 130 135 0 357 8 vmsppl 368 6106 0 6075 4 0 4 4 0 8 0 rwobjpl 56 154613 0 147242 112 4 108 108 0 8 2 pdppl 4096 12221 0 12150 253 172 81 89 0 8 10 pvpl 32 2306385 0 2291156 349 179 170 255 0 265 16 pmappl 248 6106 0 6075 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1245 0 386 25 0 25 25 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82591c2e) at panic+0x177 sys/kern/subr_prf.c:202 vop_generic_badop(ffff8000246b1e48) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133 VOP_STRATEGY(fffffd8067ea8b20,fffffd80750ea250) at VOP_STRATEGY+0x9b sys/kern/vfs_vops.c:644 bwrite(fffffd80750ea250) at bwrite+0x1f0 sys/kern/vfs_bio.c:763 VOP_BWRITE(fffffd80750ea250) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:656 ufs_mkdir(ffff8000246b20e0) at ufs_mkdir+0x6b4 sys/ufs/ufs/ufs_vnops.c:1248 VOP_MKDIR(fffffd8078ad9170,ffff8000246b2240,ffff8000246b2270,ffff8000246b2170) at VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 domkdirat(ffff80002346c7e8,ffffff9c,7f7ffffc83b0,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:3116 syscall(ffff8000246b23f0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000246b23f0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc8420, count: -11 ddb{0}> machine ddbcpu 1