panic: ffs_blkfree: bad size Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *118732 51258 0 0x2 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff83312600) at panic+0x1cf sys/kern/subr_prf.c:198 ffs_blkfree(fffffd805eda04e8,edc52ea2,4000) at ffs_blkfree+0xd33 sys/ufs/ffs/ffs_alloc.c:1285 ffs_truncate(fffffd805eda04e8,0,4,fffffd807f7d75b0) at ffs_truncate+0x116b sys/ufs/ffs/ffs_inode.c:304 ufs_rmdir(ffff80002a8aba08) at ufs_rmdir+0x374 sys/ufs/ufs/ufs_vnops.c:1265 VOP_RMDIR(fffffd8061f9ade0,fffffd8061f9a498,ffff80002a8abae8) at VOP_RMDIR+0x19a sys/kern/vfs_vops.c:413 dounlinkat(ffff80002a7e0010,ffffff9c,72bb1d4af340,8) at dounlinkat+0x2e0 sys/kern/vfs_syscalls.c:1884 syscall(ffff80002a8abc60) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72bb1d4af330, count: 6 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: ffs_blkfree: bad size ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff83312600) at panic+0x1cf sys/kern/subr_prf.c:198 ffs_blkfree(fffffd805eda04e8,edc52ea2,4000) at ffs_blkfree+0xd33 sys/ufs/ffs/ffs_alloc.c:1285 ffs_truncate(fffffd805eda04e8,0,4,fffffd807f7d75b0) at ffs_truncate+0x116b sys/ufs/ffs/ffs_inode.c:304 ufs_rmdir(ffff80002a8aba08) at ufs_rmdir+0x374 sys/ufs/ufs/ufs_vnops.c:1265 VOP_RMDIR(fffffd8061f9ade0,fffffd8061f9a498,ffff80002a8abae8) at VOP_RMDIR+0x19a sys/kern/vfs_vops.c:413 dounlinkat(ffff80002a7e0010,ffffff9c,72bb1d4af340,8) at dounlinkat+0x2e0 sys/kern/vfs_syscalls.c:1884 syscall(ffff80002a8abc60) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72bb1d4af330, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002a8ab610 rbx 0xffff800000b5f0d4 rdx 0 rcx 0 rax 0xffff80002a7e0010 r8 0x101010101010101 r9 0x8080808080808080 r10 0x603561d3eb750d4a r11 0x17a99d30c88464c4 r12 0 r13 0x8 r14 0 r15 0x1 rip 0xffffffff82de6ce5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a8ab600 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=118732 pid=51258 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=0xffff80002a7e0520,0xffff80002a7cdc00 process=0xffff8000ffffb820 user=0xffff80002a8a6000, vmspace=0xfffffd807b932440 estcpu=36, cpticks=1, pctcpu=0.0, user=3, sys=13, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 42868 221636 70350 0 2 0x82000 syz-executor 42868 235426 70350 0 3 0x4002000 suspend syz-executor 7673 350785 69477 0 2 0 syz-executor 7673 366315 69477 0 2 0x4000000 syz-executor 7673 326071 69477 0 3 0x4000080 fsleep syz-executor 7673 484279 69477 0 3 0x4000080 fsleep syz-executor 20510 329526 31134 0 2 0 syz-executor 20510 295715 31134 0 3 0x4000080 fsleep syz-executor 89019 151380 49144 0 2 0x82 syz-executor 23021 184042 0 0 3 0x14200 acct acct 56782 305507 0 0 3 0x14280 nfsidl nfsio 93794 415372 0 0 3 0x14280 nfsidl nfsio 84910 278878 0 0 3 0x14280 nfsidl nfsio 9023 426258 0 0 3 0x14280 nfsidl nfsio 9499 439753 0 0 3 0x14280 nfsidl nfsio 26789 218987 0 0 3 0x14280 nfsidl nfsio 25588 364307 0 0 3 0x14280 nfsidl nfsio 61894 102501 0 0 3 0x14280 nfsidl nfsio 68740 207602 0 0 3 0x14280 nfsidl nfsio 31556 106753 0 0 3 0x14280 nfsidl nfsio 60257 452279 0 0 3 0x14280 nfsidl nfsio 26997 294813 0 0 3 0x14280 nfsidl nfsio 97039 461948 0 0 3 0x14280 nfsidl nfsio 10087 290379 0 0 3 0x14280 nfsidl nfsio 33983 269361 0 0 3 0x14280 nfsidl nfsio 55844 303255 0 0 3 0x14280 nfsidl nfsio 39416 346197 0 0 3 0x14280 nfsidl nfsio 94570 521749 0 0 3 0x14280 nfsidl nfsio 76290 68967 0 0 3 0x14280 nfsidl nfsio 28643 381695 0 0 3 0x14280 nfsidl nfsio 69477 485862 49144 0 3 0x82 nanoslp syz-executor 20990 100439 1 0 3 0x100083 ttyin getty 7434 269370 0 0 3 0x14200 bored sosplice 94777 42346 49144 0 3 0x82 wait syz-executor 70192 187491 49144 0 2 0x2 syz-executor *51258 118732 49144 0 7 0x2 syz-executor 82974 239523 49144 0 2 0x2 syz-executor 31134 135364 49144 0 3 0x82 nanoslp syz-executor 70350 488540 49144 0 3 0x82 nanoslp syz-executor 49144 507957 47367 0 3 0x82 nanoslp syz-executor 47367 211791 73264 0 3 0x10008a sigsusp ksh 73264 362909 66065 0 3 0x98 kqread sshd-session 66065 84638 97318 0 3 0x92 kqread sshd-session 97318 56400 1 0 3 0x88 kqread sshd 94990 514406 24433 73 3 0x1100090 kqread syslogd 24433 205896 1 0 3 0x100082 sbwait syslogd 28428 507730 1 0 3 0x100080 kqread resolvd 50533 507342 212 77 3 0x100092 kqread dhcpleased 62631 30096 212 77 3 0x100092 kqread dhcpleased 212 381268 1 0 3 0x80 kqread dhcpleased 26419 12144 0 0 3 0x14200 bored smr 17431 176527 0 0 2 0x14200 zerothread 10863 410443 0 0 3 0x14200 aiodoned aiodoned 30620 238862 0 0 3 0x14200 syncer update 24018 241195 0 0 3 0x14200 cleaner cleaner 37530 275701 0 0 3 0x14200 reaper reaper 19021 12243 0 0 3 0x14200 pgdaemon pagedaemon 9726 36254 0 0 3 0x14200 bored viomb 21931 245319 0 0 3 0x40014200 acpi0 acpi0 76203 441641 0 0 3 0x14200 bored softnet3 11858 210883 0 0 3 0x14200 bored softnet2 25037 67373 0 0 3 0x14200 bored softnet1 96033 244277 0 0 3 0x14200 bored softnet0 57666 122340 0 0 3 0x14200 bored systqmp 28012 188096 0 0 3 0x14200 bored systq 35368 190271 0 0 2 0x40014200 softclock 45528 481703 0 0 3 0x40014200 idle0 1 154775 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10233 11313K 11525K 166960K 13138 0 pcb 18 20K 22K 166960K 328 0 rtable 217 8K 9K 166960K 872 0 pf 34 13K 21K 166960K 224 0 ifaddr 40 7K 8K 166960K 144 0 ifgroup 50 2K 2K 166960K 227 0 sysctl 4 1K 3K 166960K 5 0 counters 30 17K 17K 166960K 86 0 ioctlops 0 0K 4K 166960K 240 0 iov 0 0K 18K 166960K 219 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1461 92K 92K 166960K 2848 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 22 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 46 0 dirhash 12 2K 2K 166960K 51 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 14 49K 97K 166960K 1644 0 sigio 0 0K 0K 166960K 87 0 proc 60 59K 124K 166960K 950 0 subproc 72 4K 4K 166960K 174 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 286 0 in_multi 92 7K 7K 166960K 282 0 ether_multi 1 0K 0K 166960K 6 0 mrt 2 0K 0K 166960K 8 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 229 1023K 1023K 166960K 229 0 exec 0 0K 1K 166960K 698 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 182 71K 86K 166960K 15895 0 UVM aobj 32 4K 4K 166960K 41 0 pinsyscall 35 70K 96K 166960K 2956 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 145 0 NDP 13 0K 2K 166960K 100 0 temp 75 8636K 8764K 166960K 63720 0 kqueue 13 20K 30K 166960K 275 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 259 0 256 3 2 1 3 0 8 0 rtentry 112 288 0 191 4 0 4 4 0 8 0 unpcb 144 1290 0 1273 12 6 6 6 0 8 5 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 808 383 0 377 6 4 2 4 0 8 0 arp 88 49 0 30 1 0 1 1 0 8 0 ipq 40 4 0 3 1 0 1 1 0 8 0 ipqe 40 40 0 39 1 0 1 1 0 8 0 inpcb 344 1880 0 1869 33 19 14 14 0 8 10 nd6 104 64 0 40 1 0 1 1 0 8 0 pkpcb 40 8 0 8 3 2 1 1 0 8 1 kcovpl 48 19 0 11 1 0 1 1 0 8 0 ppxss 1072 23 0 23 3 2 1 1 0 8 1 pppxif 1376 11 0 11 3 2 1 1 0 8 1 pfstscr 40 2 0 2 1 0 1 1 0 8 1 pftag 88 36 0 36 2 1 1 1 0 8 1 pfstitem 24 10 0 0 1 0 1 1 0 8 0 pfstkey 128 16 0 8 1 0 1 1 0 8 0 pfstate 344 8 0 3 1 0 1 1 0 8 0 pfrule 1344 20 0 20 2 1 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 1154 0 741 33 6 27 30 0 8 1 art_table 32 1157 0 741 4 0 4 4 0 8 0 art_node 16 283 0 200 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 11 1 1 0 1 0 8 0 semapl 112 44 0 34 1 0 1 1 0 8 0 shmpl 112 38 0 9 1 0 1 1 0 8 0 dirhash 1024 43 0 26 3 0 3 3 0 8 0 dino2pl 256 4011 0 2495 96 0 96 96 0 8 0 ffsino 248 4011 0 2495 96 0 96 96 0 8 0 nchpl 144 6162 0 4448 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 1 0 1 0 8 0 uvmvnodes 80 5146 0 0 106 0 106 106 0 8 0 vnodes 216 5146 0 0 286 0 286 286 0 8 0 namei 1024 22287 0 22286 3 2 1 2 0 8 0 kstatmem 264 110 0 88 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 18020 0 18020 8 7 1 8 1 8 1 plimitpl 152 230 0 214 1 0 1 1 0 8 0 sigapl 424 1925 0 1860 9 1 8 8 0 8 0 futexpl 64 20979 0 20976 1 0 1 1 0 8 0 knotepl 120 55700 0 55653 25 15 10 10 0 8 7 kqueuepl 184 471 0 461 3 2 1 3 0 8 0 pipepl 296 485 0 458 8 5 3 8 0 8 0 fdescpl 440 1885 0 1859 5 1 4 5 0 8 0 filepl 120 12610 0 12391 20 7 13 15 0 8 4 lockfpl 104 532 0 530 2 0 2 2 0 8 1 lockfspl 48 135 0 133 1 0 1 1 0 8 0 sessionpl 144 34 0 26 1 0 1 1 0 8 0 pgrppl 48 56 0 40 1 0 1 1 0 8 0 ucredpl 104 2139 0 2128 1 0 1 1 0 8 0 zombiepl 144 2045 0 2043 2 1 1 1 0 8 0 processpl 1104 1925 0 1860 5 0 5 5 0 8 0 procpl 648 3971 0 3901 7 0 7 7 0 8 0 sosppl 168 7 0 7 3 2 1 1 0 8 1 sockpl 528 3457 0 3427 33 21 12 18 0 8 7 mcl64k 65536 50 0 50 3 2 1 1 0 8 1 mcl16k 16384 19 0 19 2 2 0 1 0 8 0 mcl12k 12288 5 0 5 2 2 0 1 0 8 0 mcl9k 9216 4 0 4 2 2 0 1 0 8 0 mcl8k 8192 175 0 175 3 2 1 1 0 8 1 mcl4k 4096 4361 0 4307 15 7 8 14 0 8 1 mcl2k2 2112 4 0 4 2 2 0 1 0 8 0 mcl2k 2048 1950 0 1949 3 2 1 2 0 8 0 mtagpl 96 214 0 24 5 0 5 5 0 8 0 mbufpl 256 22896 0 22503 75 48 27 67 0 8 1 bufpl 280 4730 0 130 329 0 329 329 0 8 0 anonpl 24 243932 0 241007 71 31 40 45 0 187 16 amapchunkpl 152 52347 0 51970 41 15 26 28 0 158 6 amappl16 200 4032 0 4003 21 15 6 15 0 8 3 amappl15 192 1 0 1 1 1 0 1 0 8 0 amappl14 184 124 0 114 1 0 1 1 0 8 0 amappl13 176 7 0 7 1 1 0 1 0 8 0 amappl12 168 2663 0 2637 3 1 2 3 0 8 0 amappl11 160 47 0 37 1 0 1 1 0 8 0 amappl10 152 80 0 80 1 1 0 1 0 8 0 amappl9 144 268 0 268 1 1 0 1 0 8 0 amappl8 136 22 0 21 1 0 1 1 0 8 0 amappl7 128 122 0 112 1 0 1 1 0 8 0 amappl6 120 284 0 281 1 0 1 1 0 8 0 amappl5 112 161 0 153 1 0 1 1 0 8 0 amappl4 104 333 0 317 1 0 1 1 0 8 0 amappl3 96 10524 0 10437 5 1 4 4 0 8 1 amappl2 88 792 0 734 2 0 2 2 0 8 0 amappl1 80 12930 0 12427 13 0 13 13 0 8 0 amappl 88 15382 0 15248 5 0 5 5 0 92 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 3 0 3 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 40 0 9 1 0 1 1 0 8 0 uaddrrnd 24 1885 0 1859 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1885 0 1859 1 0 1 1 0 8 0 vmmpekpl 168 16127 0 16084 3 0 3 3 0 8 0 vmmpepl 168 115871 0 114308 91 10 81 89 0 357 3 vmsppl 360 1884 0 1859 4 1 3 4 0 8 0 rwobjpl 32 35292 0 29308 50 1 49 49 0 8 0 pdppl 4096 3777 0 3718 119 50 69 83 0 8 10 pvpl 32 771592 0 763586 159 52 107 115 0 265 22 pmappl 216 1884 0 1859 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 370 0 130 9 0 9 9 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff83312600) at panic+0x1cf sys/kern/subr_prf.c:198 ffs_blkfree(fffffd805eda04e8,edc52ea2,4000) at ffs_blkfree+0xd33 sys/ufs/ffs/ffs_alloc.c:1285 ffs_truncate(fffffd805eda04e8,0,4,fffffd807f7d75b0) at ffs_truncate+0x116b sys/ufs/ffs/ffs_inode.c:304 ufs_rmdir(ffff80002a8aba08) at ufs_rmdir+0x374 sys/ufs/ufs/ufs_vnops.c:1265 VOP_RMDIR(fffffd8061f9ade0,fffffd8061f9a498,ffff80002a8abae8) at VOP_RMDIR+0x19a sys/kern/vfs_vops.c:413 dounlinkat(ffff80002a7e0010,ffffff9c,72bb1d4af340,8) at dounlinkat+0x2e0 sys/kern/vfs_syscalls.c:1884 syscall(ffff80002a8abc60) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72bb1d4af330, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff83312600) at panic+0x1cf sys/kern/subr_prf.c:198 ffs_blkfree(fffffd805eda04e8,edc52ea2,4000) at ffs_blkfree+0xd33 sys/ufs/ffs/ffs_alloc.c:1285 ffs_truncate(fffffd805eda04e8,0,4,fffffd807f7d75b0) at ffs_truncate+0x116b sys/ufs/ffs/ffs_inode.c:304 ufs_rmdir(ffff80002a8aba08) at ufs_rmdir+0x374 sys/ufs/ufs/ufs_vnops.c:1265 VOP_RMDIR(fffffd8061f9ade0,fffffd8061f9a498,ffff80002a8abae8) at VOP_RMDIR+0x19a sys/kern/vfs_vops.c:413 dounlinkat(ffff80002a7e0010,ffffff9c,72bb1d4af340,8) at dounlinkat+0x2e0 sys/kern/vfs_syscalls.c:1884 syscall(ffff80002a8abc60) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72bb1d4af330, count: -9