panic: ffs_valloc: dup alloc Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 266204 36393 0 0 0 0 syz-executor *406963 16901 0 0x2 0 1K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83430dd8) at panic+0x1e5 sys/kern/subr_prf.c:198 ffs_inode_alloc(fffffd806d6c7138,41ed,fffffd80097fd5b0,ffff80002a2b9df8) at ffs_inode_alloc+0x94e ufs_mkdir(ffff80002a2b9e60) at ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 VOP_MKDIR(fffffd806fbc2548,ffff80002a2b9fc0,ffff80002a2b9ff0,ffff80002a2b9ef0) at VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 domkdirat(ffff8000ffffd4c8,ffffff9c,6fbd2bc4fa60,1ff) at domkdirat+0x179 sys/kern/vfs_syscalls.c:3143 syscall(ffff80002a2ba170) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2ba170) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fbd2bc4fb00, count: 7 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: ffs_valloc: dup alloc ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83430dd8) at panic+0x1e5 sys/kern/subr_prf.c:198 ffs_inode_alloc(fffffd806d6c7138,41ed,fffffd80097fd5b0,ffff80002a2b9df8) at ffs_inode_alloc+0x94e ufs_mkdir(ffff80002a2b9e60) at ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 VOP_MKDIR(fffffd806fbc2548,ffff80002a2b9fc0,ffff80002a2b9ff0,ffff80002a2b9ef0) at VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 domkdirat(ffff8000ffffd4c8,ffffff9c,6fbd2bc4fa60,1ff) at domkdirat+0x179 sys/kern/vfs_syscalls.c:3143 syscall(ffff80002a2ba170) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2ba170) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fbd2bc4fb00, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a2b9b70 rbx 0xffff8000299aee07 rdx 0 rcx 0xffff8000ffffd4c8 rax 0xffff8000299adff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x24f327caa325569e r11 0x33f274ea08dddb19 r12 0xffff8000299aec08 r13 0 r14 0 r15 0x1 rip 0xffffffff826d9455 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a2b9b60 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=406963 pid=16901 tcnt=1 stat=onproc flags process=2 proc=0 runpri=17, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a232a70,0xffff8000ffffcfa8 process=0xffff8000ffff0010 user=0xffff80002a2b5000, vmspace=0xfffffd806ea8c5c8 estcpu=36, cpticks=13, pctcpu=0.3, user=0, sys=12, intr=1 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 2504 287725 84834 0 2 0 syz-executor 2504 327416 84834 0 2 0x4000000 syz-executor 36393 266204 93357 0 7 0 syz-executor 36393 444973 93357 0 3 0x4000080 kqpoll syz-executor 36393 265132 93357 0 3 0x4000080 kqpoll syz-executor 36393 31591 93357 0 3 0x4000080 fsleep syz-executor 25137 315177 1 0 3 0x82 nanoslp getty 52031 189417 90178 0 3 0x80 nanoslp syz-executor 52031 86358 90178 0 3 0x4000080 fsleep syz-executor 52031 208592 90178 0 3 0x4000080 kqread syz-executor 52031 260116 90178 0 3 0x4000080 fsleep syz-executor 50339 486167 85427 0 3 0x80 nanoslp syz-executor 50339 186022 85427 0 3 0x4000080 kqread syz-executor 31709 240488 0 0 3 0x14200 acct acct 93357 314969 2642 0 3 0x82 nanoslp syz-executor 57345 464215 2642 0 3 0x82 nanoslp syz-executor 84834 71347 2642 0 3 0x82 nanoslp syz-executor 85427 267329 2642 0 3 0x82 nanoslp syz-executor 90178 372946 2642 0 3 0x82 nanoslp syz-executor *16901 406963 2642 0 7 0x2 syz-executor 2642 200520 1 0 2 0x2 syz-executor 62330 267582 1 74 3 0x1100092 bpf pflogd 61829 490090 1 73 3 0x1100090 kqread syslogd 45107 132660 0 0 3 0x14200 bored smr 89315 516058 0 0 2 0x14200 zerothread 6248 378 0 0 3 0x14200 aiodoned aiodoned 95445 496454 0 0 3 0x14200 syncer update 5510 366933 0 0 3 0x14200 cleaner cleaner 74578 156579 0 0 3 0x14200 reaper reaper 1027 92354 0 0 3 0x14200 pgdaemon pagedaemon 73549 35893 0 0 3 0x14200 bored viomb 29941 278603 0 0 3 0x40014200 acpi0 acpi0 12975 219176 0 0 3 0x40014200 idle1 98567 443503 0 0 3 0x14200 bored softnet1 60851 230535 0 0 3 0x14200 bored softnet0 46497 191943 0 0 3 0x14200 bored systqmp 27440 501487 0 0 3 0x14200 bored systq 57844 110784 0 0 3 0x14200 tmoslp softclockmp 92760 496055 0 0 3 0x40014200 tmoslp softclock 24872 8763 0 0 3 0x40014200 idle0 1 363427 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 16901 (syz-executor) thread 0xffff8000ffffd4c8 (406963) exclusive rrwlock inode r = 0 (0xfffffd806c618ea8) #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 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3143 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806d6c71d8) #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:576 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3128 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839b55c0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11060 12158K 13047K 166960K 12685 0 pcb 17 12K 12K 166960K 60 0 rtable 216 8K 8K 166960K 414 0 pf 37 18K 23K 166960K 83 0 ifaddr 40 7K 7K 166960K 55 0 ifgroup 51 2K 2K 166960K 73 0 sysctl 4 1K 9K 166960K 8 0 counters 68 36K 37K 166960K 86 0 ioctlops 0 0K 4K 166960K 1595 0 iov 0 0K 12K 166960K 7 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1389 87K 87K 166960K 1671 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 9 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 15 53K 102K 166960K 380 0 sigio 0 0K 0K 166960K 4 0 proc 22 33K 164K 166960K 600 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 22 0 in_multi 92 6K 7K 166960K 110 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 11 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 416 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 147 99K 198K 166960K 5254 0 UVM aobj 9 2K 2K 166960K 11 0 pinsyscall 21 42K 104K 166960K 1527 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 5 0 NDP 11 0K 2K 166960K 34 0 temp 46 9080K 9148K 166960K 16184 0 kqueue 6 10K 34K 166960K 78 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 53 0 51 1 0 1 1 0 8 0 rtentry 176 124 0 31 5 0 5 5 0 8 0 unpcb 144 133 0 128 2 1 1 2 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 70 0 68 1 0 1 1 0 8 0 arp 136 20 0 4 1 0 1 1 0 8 0 inpcb 328 220 0 213 2 1 1 2 0 8 0 nd6 152 29 0 4 2 0 2 2 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 6 0 6 2 1 1 1 0 8 1 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 4 0 0 1 0 1 1 0 482 0 pffrnode 88 4 0 0 1 0 1 1 0 8 0 pffrent 40 7 0 3 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 2 1 0 1 1 0 8 0 pfanchor 1288 4 0 1 1 0 1 1 0 8 0 pftag 88 2 0 2 1 1 0 1 0 8 0 pfstitem 24 38 0 1 1 0 1 1 0 8 0 pfstkey 128 40 0 3 2 0 2 2 0 8 0 pfstate 448 39 0 3 4 0 4 4 0 8 0 pfrule 1360 25 0 19 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 545 0 122 31 2 29 31 0 8 0 art_table 40 546 0 122 5 0 5 5 0 8 0 art_node 32 124 0 40 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 3 1 0 1 1 0 8 0 semapl 112 6 0 1 1 0 1 1 0 8 0 shmpl 112 8 0 2 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2041 0 579 93 0 93 93 0 8 0 ffsino 296 2041 0 579 114 0 114 114 0 8 0 nchpl 144 2571 0 873 64 0 64 64 0 8 0 vnodes 216 2345 0 0 131 0 131 131 0 8 0 namei 1024 8627 0 8626 3 2 1 2 0 8 0 percpumem 16 58 0 9 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 0 1 0 1 1 0 8 0 kstatmem 264 38 0 14 3 1 2 3 0 8 0 scsiplug 72 2 0 2 1 1 0 1 0 8 0 scxspl 216 9108 0 9108 11 10 1 8 1 8 1 plimitpl 152 122 0 110 1 0 1 1 0 8 0 sigapl 424 690 0 654 7 1 6 7 0 8 0 knotepl 120 1014 0 0 31 0 31 31 0 8 0 kqueuepl 224 92 0 86 2 1 1 2 0 8 0 pipepl 344 145 0 118 3 0 3 3 0 8 0 fdescpl 528 673 0 654 3 0 3 3 0 8 0 filepl 160 3232 0 3044 13 2 11 13 0 8 0 lockfpl 104 101 0 101 2 1 1 1 0 8 1 lockfspl 48 44 0 44 2 1 1 1 0 8 1 sessionpl 144 37 0 33 1 0 1 1 0 8 0 pgrppl 48 49 0 37 1 0 1 1 0 8 0 ucredpl 104 396 0 389 1 0 1 1 0 8 0 zombiepl 144 657 0 654 1 0 1 1 0 8 0 processpl 1232 690 0 654 5 0 5 5 0 8 0 procpl 664 1096 0 1052 6 0 6 6 0 8 0 sosppl 176 3 0 3 1 1 0 1 0 8 0 sockpl 752 417 0 403 5 2 3 5 0 8 0 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 7 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 164 0 0 11 0 11 11 0 8 0 bufpl 280 3115 0 108 215 0 215 215 0 8 0 anonpl 32 8068 0 0 65 0 65 65 0 246 0 amapchunkpl 152 16648 0 16287 30 8 22 29 0 158 2 amappl16 200 2466 0 2441 18 14 4 16 0 8 0 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 440 0 440 1 1 0 1 0 8 0 amappl13 176 168 0 165 1 0 1 1 0 8 0 amappl12 168 927 0 909 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 75 0 70 1 0 1 1 0 8 0 amappl9 144 360 0 359 1 0 1 1 0 8 0 amappl8 136 99 0 98 1 0 1 1 0 8 0 amappl7 128 218 0 212 1 0 1 1 0 8 0 amappl6 120 163 0 163 1 1 0 1 0 8 0 amappl5 112 101 0 99 1 0 1 1 0 8 0 amappl4 104 293 0 285 1 0 1 1 0 8 0 amappl3 96 3063 0 2984 4 0 4 4 0 8 0 amappl2 88 530 0 513 2 0 2 2 0 8 0 amappl1 80 10745 0 10572 16 6 10 16 0 8 0 amappl 88 4489 0 4367 5 1 4 5 0 92 0 uvmvnodes 80 108 0 0 3 0 3 3 0 8 0 dma8192 8192 1 0 1 1 1 0 1 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 128 255 0 255 2 2 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 24 673 0 654 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 673 0 654 1 0 1 1 0 8 0 vmmpekpl 168 7261 0 7221 2 0 2 2 0 8 0 vmmpepl 168 51010 0 50089 99 38 61 99 0 357 0 vmsppl 488 672 0 654 5 1 4 5 0 8 0 rwobjpl 80 17191 0 16662 27 4 23 27 0 8 0 pdppl 4096 1353 0 1308 103 52 51 87 0 8 6 pvpl 32 17338 0 0 140 0 140 140 0 265 0 pmappl 256 672 0 654 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 281 0 61 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8390eff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x38 sys/dev/kcov.c:-1 __mp_lock(ffffffff839b4dc0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839b4dc0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x73710209ddc0, count: 7 ddb{0}> trace x86_ipi_db(ffffffff8390eff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x38 sys/dev/kcov.c:-1 __mp_lock(ffffffff839b4dc0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839b4dc0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x73710209ddc0, count: -8 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(ffffffff83430dd8) at panic+0x1e5 sys/kern/subr_prf.c:198 ffs_inode_alloc(fffffd806d6c7138,41ed,fffffd80097fd5b0,ffff80002a2b9df8) at ffs_inode_alloc+0x94e ufs_mkdir(ffff80002a2b9e60) at ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 VOP_MKDIR(fffffd806fbc2548,ffff80002a2b9fc0,ffff80002a2b9ff0,ffff80002a2b9ef0) at VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 domkdirat(ffff8000ffffd4c8,ffffff9c,6fbd2bc4fa60,1ff) at domkdirat+0x179 sys/kern/vfs_syscalls.c:3143 syscall(ffff80002a2ba170) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2ba170) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fbd2bc4fb00, count: 7 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83430dd8) at panic+0x1e5 sys/kern/subr_prf.c:198 ffs_inode_alloc(fffffd806d6c7138,41ed,fffffd80097fd5b0,ffff80002a2b9df8) at ffs_inode_alloc+0x94e ufs_mkdir(ffff80002a2b9e60) at ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 VOP_MKDIR(fffffd806fbc2548,ffff80002a2b9fc0,ffff80002a2b9ff0,ffff80002a2b9ef0) at VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 do