panic: vop_generpianicc_:b ado p kStopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 391749 6455 0 0 0x4000000 1 syz-executor.6 *160104 59713 0 0x2 0 0 syz-executor.4 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82742aec) at panic+0x177 sys/kern/subr_prf.c:198 vop_generic_badop(ffff800027b6ca38) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133 VOP_STRATEGY(fffffd805e5b2c30,fffffd80677e8278) at VOP_STRATEGY+0x9b sys/kern/vfs_vops.c:628 bwrite(fffffd80677e8278) at bwrite+0x1f0 sys/kern/vfs_bio.c:760 VOP_BWRITE(fffffd80677e8278) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:640 ufs_mkdir(ffff800027b6ccd0) at ufs_mkdir+0x6b4 sys/ufs/ufs/ufs_vnops.c:1236 VOP_MKDIR(fffffd8062dfd1e8,ffff800027b6ce30,ffff800027b6ce60,ffff800027b6cd60) at VOP_MKDIR+0xbf sys/kern/vfs_vops.c:388 domkdirat(ffff800021203888,ffffff9c,7f7ffffc7e50,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:3112 syscall(ffff800027b6cfe0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800027b6cfe0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc7ec0, 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/multicore/kernel/sys/kern/kern_fork.c", line 674 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82742aec) at panic+0x177 sys/kern/subr_prf.c:198 vop_generic_badop(ffff800027b6ca38) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133 VOP_STRATEGY(fffffd805e5b2c30,fffffd80677e8278) at VOP_STRATEGY+0x9b sys/kern/vfs_vops.c:628 bwrite(fffffd80677e8278) at bwrite+0x1f0 sys/kern/vfs_bio.c:760 VOP_BWRITE(fffffd80677e8278) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:640 ufs_mkdir(ffff800027b6ccd0) at ufs_mkdir+0x6b4 sys/ufs/ufs/ufs_vnops.c:1236 VOP_MKDIR(fffffd8062dfd1e8,ffff800027b6ce30,ffff800027b6ce60,ffff800027b6cd60) at VOP_MKDIR+0xbf sys/kern/vfs_vops.c:388 domkdirat(ffff800021203888,ffffff9c,7f7ffffc7e50,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:3112 syscall(ffff800027b6cfe0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800027b6cfe0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc7ec0, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800027b6c960 rbx 0xffffffff82b25b8f cpu_info_full_primary+0x2b8f rdx 0 rcx 0 rax 0xffff800021203888 r8 0x101010101010101 r9 0x8080808080808080 r10 0x742d2d323f979ab4 r11 0x40db8348a0a900ba r12 0xffffffff82b25990 cpu_info_full_primary+0x2990 r13 0 r14 0 r15 0x1 rip 0xffffffff81b420b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800027b6c950 ss 0 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.4) pid=160104 stat=onproc flags process=2 proc=0 pri=17, usrpri=54, nice=20 forw=0xffffffffffffffff, list=0xffff8000212b15e0,0xffff800021202b00 process=0xffff80002122e5c0 user=0xffff800027b68000, vmspace=0xfffffd806b9e7a68 estcpu=18, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 6455 92800 76069 0 2 0 syz-executor.6 6455 391749 76069 0 7 0x4000000 syz-executor.6 6455 477417 76069 0 2 0x4000000 syz-executor.6 12019 215250 63545 0 2 0 syz-executor.7 12019 97045 63545 0 2 0x4000000 syz-executor.7 17285 442092 15174 0 2 0 syz-executor.0 17285 86681 15174 0 3 0x4000080 fsleep syz-executor.0 17285 129895 15174 0 2 0x4000000 syz-executor.0 67870 24481 0 0 3 0x14200 acct acct 78840 452486 0 0 3 0x14280 nfsidl nfsio 719 437278 0 0 3 0x14280 nfsidl nfsio 46539 75397 0 0 3 0x14280 nfsidl nfsio 71001 179930 0 0 3 0x14280 nfsidl nfsio 75908 174187 0 0 3 0x14280 nfsidl nfsio 88595 233523 0 0 3 0x14280 nfsidl nfsio 97499 89624 0 0 3 0x14280 nfsidl nfsio 70703 470742 0 0 3 0x14280 nfsidl nfsio 49497 4354 0 0 3 0x14280 nfsidl nfsio 23216 77660 0 0 3 0x14280 nfsidl nfsio 46844 413469 0 0 3 0x14280 nfsidl nfsio 33159 56235 0 0 3 0x14280 nfsidl nfsio 69137 333108 0 0 3 0x14280 nfsidl nfsio 44342 155992 0 0 3 0x14280 nfsidl nfsio 23654 455053 0 0 3 0x14280 nfsidl nfsio 44614 392301 0 0 3 0x14280 nfsidl nfsio 31894 64140 0 0 3 0x14280 nfsidl nfsio 20560 4757 0 0 3 0x14280 nfsidl nfsio 73701 356429 0 0 3 0x14280 nfsidl nfsio 70464 161010 0 0 3 0x14280 nfsidl nfsio 27998 469070 51475 0 2 0x2 syz-executor.1 89176 248009 0 0 3 0x14200 bored sosplice 63545 388390 51475 0 3 0x82 nanoslp syz-executor.7 9004 233680 51475 0 2 0x2 syz-executor.5 76069 246516 51475 0 3 0x82 nanoslp syz-executor.6 *59713 160104 51475 0 7 0x2 syz-executor.4 57409 120646 91965 0 3 0x100082 netio arp 91965 343229 1 0 3 0x10008a sigsusp sh 56822 92776 51475 0 2 0x2 syz-executor.3 31645 16476 51475 0 2 0x2 syz-executor.2 15174 212767 51475 0 3 0x82 nanoslp syz-executor.0 51475 161813 92427 0 3 0x82 wait syz-fuzzer 51475 467536 92427 0 3 0x4000082 nanoslp syz-fuzzer 51475 210777 92427 0 3 0x4000082 wait syz-fuzzer 51475 336743 92427 0 3 0x4000082 thrsleep syz-fuzzer 51475 340267 92427 0 3 0x4000082 wait syz-fuzzer 51475 54072 92427 0 3 0x4000082 wait syz-fuzzer 51475 520421 92427 0 3 0x4000082 thrsleep syz-fuzzer 51475 268569 92427 0 3 0x4000082 thrsleep syz-fuzzer 51475 428474 92427 0 3 0x4000082 wait syz-fuzzer 51475 116333 92427 0 3 0x4000082 wait syz-fuzzer 51475 250456 92427 0 3 0x4000082 thrsleep syz-fuzzer 51475 489020 92427 0 3 0x4000082 wait syz-fuzzer 51475 73327 92427 0 3 0x4000082 kqread syz-fuzzer 51475 489170 92427 0 3 0x4000082 thrsleep syz-fuzzer 51475 347528 92427 0 3 0x4000082 wait syz-fuzzer 92427 138885 86560 0 3 0x10008a sigsusp ksh 86560 12059 6661 0 3 0x9a kqread sshd 44035 498021 1 0 3 0x100083 ttyin getty 6661 97198 1 0 3 0x88 kqread sshd 99321 252384 32921 74 3 0x1100092 bpf pflogd 32921 247847 1 0 3 0x80 netio pflogd 82328 28981 49745 73 3 0x1100090 kqread syslogd 49745 421548 1 0 3 0x100082 netio syslogd 83258 326701 1 0 3 0x100080 kqread resolvd 76231 309857 35242 77 3 0x100092 kqread dhcpleased 5861 461624 35242 77 3 0x100092 kqread dhcpleased 35242 142990 1 0 3 0x80 kqread dhcpleased 66260 1783 0 0 3 0x14200 bored smr 15252 296958 0 0 2 0x14200 zerothread 3702 123343 0 0 3 0x14200 aiodoned aiodoned 30347 135593 0 0 3 0x14200 syncer update 71479 278218 0 0 3 0x14200 cleaner cleaner 19059 515578 0 0 3 0x14200 reaper reaper 41231 473235 0 0 3 0x14200 pgdaemon pagedaemon 55474 175480 0 0 3 0x14200 bored viomb 89874 330333 0 0 3 0x40014200 acpi0 acpi0 43464 49305 0 0 3 0x40014200 idle1 85041 129716 0 0 3 0x14200 bored softnet 85083 389155 0 0 3 0x14200 bored softnet 56840 417364 0 0 3 0x14200 bored softnet 67048 176194 0 0 3 0x14200 bored softnet 11661 29126 0 0 3 0x14200 bored systqmp 65614 375519 0 0 3 0x14200 bored systq 25393 42196 0 0 3 0x40014200 bored softclock 8784 457606 0 0 3 0x40014200 idle0 1 472207 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10233 6488K 6734K 78643K 11683 0 pcb 13 9K 10K 78643K 74 0 rtable 201 13K 15K 78643K 397 0 ifaddr 75 24K 25K 78643K 93 0 sysctl 2 0K 0K 78643K 2 0 counters 58 35K 35K 78643K 62 0 ioctlops 0 0K 4K 78643K 1496 0 iov 0 0K 16K 78643K 73 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1297 81K 81K 78643K 1423 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 8 0 VM map 2 1K 1K 78643K 2 0 sem 11 0K 0K 78643K 49 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 15 53K 81K 78643K 448 0 sigio 0 0K 0K 78643K 141 0 proc 70 91K 115K 78643K 579 0 subproc 117 7K 7K 78643K 117 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 9 0 in_multi 88 5K 6K 78643K 130 0 ether_multi 1 0K 0K 78643K 8 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 229 1023K 1023K 78643K 229 0 exec 0 0K 1K 78643K 392 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 8 62K 64K 78643K 10 0 UVM amap 297 83K 89K 78643K 4966 0 UVM aobj 10 2K 2K 78643K 14 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 12 0K 1K 78643K 31 0 temp 128 5774K 5838K 78643K 5160 0 kqueue 12 18K 24K 78643K 50 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 61 0 57 1 0 1 1 0 8 0 rtentry 112 126 0 34 4 0 4 4 0 8 0 unpcb 144 658 0 643 11 5 6 6 0 8 5 syncache 296 7 0 7 2 2 0 1 0 8 0 tcpqe 32 213 0 213 4 4 0 2 0 8 0 tcpcb 776 106 0 102 5 4 1 5 0 8 0 arp 120 19 0 3 1 0 1 1 0 8 0 inpcb 368 493 0 486 8 6 2 7 0 8 1 nd6 48 25 0 4 1 0 1 1 0 8 0 kcovpl 48 9 0 0 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 pfstitem 24 18 0 7 1 0 1 1 0 8 0 pfstkey 128 18 0 7 1 0 1 1 0 8 0 pfstate 384 18 0 7 2 0 2 2 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 1 2 1 1 2 0 8 0 art_heap4 256 576 0 178 29 1 28 29 0 8 1 art_table 32 578 0 179 4 0 4 4 0 8 0 art_node 16 125 0 45 1 0 1 1 0 8 0 sysvmsgpl 40 41 0 37 1 0 1 1 0 8 0 semapl 112 9 0 0 1 0 1 1 0 8 0 shmpl 112 11 0 4 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1870 0 429 91 0 91 91 0 8 0 ffsino 272 1870 0 429 97 0 97 97 0 8 0 nchpl 144 2559 0 916 63 0 63 63 0 8 0 uvmvnodes 80 2103 0 0 43 0 43 43 0 8 0 vnodes 216 2103 0 0 117 0 117 117 0 8 0 namei 1024 8881 0 8880 3 2 1 2 0 8 0 percpumem 16 44 0 2 1 0 1 1 0 8 0 kstatmem 264 28 0 4 2 0 2 2 0 8 0 scsiplug 72 3 0 3 2 2 0 1 0 8 0 scxspl 216 8642 0 8642 13 11 2 8 0 8 2 plimitpl 152 101 0 84 1 0 1 1 0 8 0 sigapl 424 778 0 711 10 1 9 9 0 8 0 futexpl 64 3222 0 3221 2 1 1 1 0 8 0 knotepl 120 155 0 0 5 0 5 5 0 8 0 kqueuepl 216 56 0 48 1 0 1 1 0 8 0 pipepl 320 170 0 139 4 1 3 4 0 8 0 fdescpl 496 739 0 711 6 1 5 5 0 8 0 filepl 152 4016 0 3756 20 4 16 16 0 8 5 lockfpl 104 51 0 49 1 0 1 1 0 8 0 lockfspl 48 23 0 21 1 0 1 1 0 8 0 sessionpl 144 25 0 7 1 0 1 1 0 8 0 pgrppl 48 42 0 24 1 0 1 1 0 8 0 ucredpl 104 305 0 293 1 0 1 1 0 8 0 zombiepl 144 711 0 711 2 1 1 1 0 8 1 processpl 1072 778 0 711 5 0 5 5 0 8 0 procpl 696 1425 0 1339 12 2 10 10 0 8 1 srpgc 96 2 0 2 1 1 0 1 0 8 0 sosppl 168 3 0 3 1 1 0 1 0 8 0 sockpl 488 1212 0 1186 38 26 12 21 0 8 8 mcl64k 65536 9 0 0 2 0 2 2 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 13 0 0 2 0 2 2 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 10 0 0 2 0 2 2 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 402 0 0 50 0 50 50 0 8 0 mtagpl 96 12 0 0 1 0 1 1 0 8 0 mbufpl 256 461 0 0 29 0 29 29 0 8 0 bufpl 288 4415 0 146 305 0 305 305 0 8 0 anonpl 24 199742 0 180967 132 6 126 126 0 186 0 amapchunkpl 152 14343 0 13545 44 6 38 39 0 158 0 amappl16 200 3129 0 2600 29 0 29 29 0 8 0 amappl15 192 4 0 3 1 0 1 1 0 8 0 amappl14 184 152 0 138 2 1 1 2 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 443 0 437 1 0 1 1 0 8 0 amappl11 160 65 0 49 1 0 1 1 0 8 0 amappl10 152 32 0 22 1 0 1 1 0 8 0 amappl9 144 967 0 967 2 2 0 1 0 8 0 amappl8 136 164 0 124 2 0 2 2 0 8 0 amappl7 128 160 0 134 2 1 1 2 0 8 0 amappl6 120 176 0 164 2 1 1 2 0 8 0 amappl5 112 137 0 128 1 0 1 1 0 8 0 amappl4 104 512 0 480 2 1 1 2 0 8 0 amappl3 96 1663 0 1607 2 0 2 2 0 8 0 amappl2 88 1087 0 1011 4 2 2 4 0 8 0 amappl1 80 19260 0 18489 28 9 19 28 0 8 0 amappl 88 4422 0 4239 8 3 5 6 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 13 0 4 1 0 1 1 0 8 0 uaddrrnd 24 739 0 711 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 739 0 711 1 0 1 1 0 8 0 vmmpekpl 168 11702 0 11629 4 0 4 4 0 8 0 vmmpepl 168 78142 0 75464 184 48 136 166 0 357 4 vmsppl 440 738 0 711 5 1 4 4 0 8 0 rwobjpl 56 24767 0 20919 58 2 56 56 0 8 0 pdppl 4096 1485 0 1422 131 58 73 77 0 8 10 pvpl 32 464297 0 439808 368 107 261 366 0 265 41 pmappl 248 738 0 711 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 757 0 70 20 0 20 20 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(ffffffff82742aec) at panic+0x177 sys/kern/subr_prf.c:198 vop_generic_badop(ffff800027b6ca38) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133 VOP_STRATEGY(fffffd805e5b2c30,fffffd80677e8278) at VOP_STRATEGY+0x9b sys/kern/vfs_vops.c:628 bwrite(fffffd80677e8278) at bwrite+0x1f0 sys/kern/vfs_bio.c:760 VOP_BWRITE(fffffd80677e8278) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:640 ufs_mkdir(ffff800027b6ccd0) at ufs_mkdir+0x6b4 sys/ufs/ufs/ufs_vnops.c:1236 VOP_MKDIR(fffffd8062dfd1e8,ffff800027b6ce30,ffff800027b6ce60,ffff800027b6cd60) at VOP_MKDIR+0xbf sys/kern/vfs_vops.c:388 domkdirat(ffff800021203888,ffffff9c,7f7ffffc7e50,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:3112 syscall(ffff800027b6cfe0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800027b6cfe0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc7ec0, count: -11 ddb{0}> machine ddbcpu 1