login: panic: fifo_badop called Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *234318 40717 0 0x2 0 0K syz-executor.0 128018 84141 0 0x2 0x4000000 1 syz-execprog db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 fifo_badop(ffff800020b8f338) at fifo_badop+0x14 sys/miscfs/fifofs/fifo_vnops.c:491 VOP_STRATEGY(fffffd807ba83d00) at VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:715 bwrite(fffffd807ba83d00) at bwrite+0x1b6 sys/kern/vfs_bio.c:738 VOP_BWRITE(fffffd807ba83d00) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:727 ufs_mkdir(ffff800020b8f5c0) at ufs_mkdir+0x6c0 sys/ufs/ufs/ufs_vnops.c:1250 VOP_MKDIR(fffffd8069d9d320,ffff800020b8f720,ffff800020b8f770,ffff800020b8f650) at VOP_MKDIR+0xce sys/kern/vfs_vops.c:449 domkdirat(ffff800020abf8c8,ffffff9c,7f7ffffd42e0,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:2983 syscall(ffff800020b8f900) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020b8f900) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,88,7f7ffffd42e0,88,0,7f7ffffd4304) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd4350, 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 fifo_badop called ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 fifo_badop(ffff800020b8f338) at fifo_badop+0x14 sys/miscfs/fifofs/fifo_vnops.c:491 VOP_STRATEGY(fffffd807ba83d00) at VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:715 bwrite(fffffd807ba83d00) at bwrite+0x1b6 sys/kern/vfs_bio.c:738 VOP_BWRITE(fffffd807ba83d00) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:727 ufs_mkdir(ffff800020b8f5c0) at ufs_mkdir+0x6c0 sys/ufs/ufs/ufs_vnops.c:1250 VOP_MKDIR(fffffd8069d9d320,ffff800020b8f720,ffff800020b8f770,ffff800020b8f650) at VOP_MKDIR+0xce sys/kern/vfs_vops.c:449 domkdirat(ffff800020abf8c8,ffffff9c,7f7ffffd42e0,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:2983 syscall(ffff800020b8f900) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020b8f900) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,88,7f7ffffd42e0,88,0,7f7ffffd4304) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd4350, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020b8f260 rbx 0xffff800020b8f310 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff810f5583 kprintf+0x173 r9 0x1 r10 0xa77b144ca1f4323 r11 0x609076c7e9f60403 r12 0x3000000008 r13 0xffff800020b8f270 r14 0x100 r15 0x1 rip 0xffffffff8209fa08 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b8f250 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=234318 stat=onproc flags process=2 proc=0 pri=17, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff800020abe018,0xffffffff826398b0 process=0xffff800020adca80 user=0xffff800020b8a000, vmspace=0xfffffd807f00c5c0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *40717 234318 84141 0 7 0x2 syz-executor.0 84141 280202 70638 0 3 0x82 thrsleep syz-execprog 84141 194914 70638 0 3 0x4000082 nanosleep syz-execprog 84141 138092 70638 0 3 0x4000082 thrsleep syz-execprog 84141 125862 70638 0 3 0x4000082 thrsleep syz-execprog 84141 454060 70638 0 3 0x4000082 kqread syz-execprog 84141 149305 70638 0 3 0x4000082 thrsleep syz-execprog 84141 103840 70638 0 3 0x4000082 thrsleep syz-execprog 84141 79970 70638 0 3 0x4000082 nanosleep syz-execprog 84141 416521 70638 0 3 0x4000082 thrsleep syz-execprog 84141 128018 70638 0 7 0x4000002 syz-execprog 70638 430934 49442 0 3 0x10008a pause ksh 49442 232370 72111 0 3 0x92 select sshd 9161 241407 1 0 3 0x100083 ttyin getty 72111 299829 1 0 3 0x80 select sshd 52847 404035 58498 74 3 0x100092 bpf pflogd 58498 102407 1 0 3 0x80 netio pflogd 17337 375414 20057 73 3 0x100090 kqread syslogd 20057 407176 1 0 3 0x100082 netio syslogd 83024 292266 1 77 3 0x100090 poll dhclient 28632 219177 1 0 3 0x80 poll dhclient 99186 148353 0 0 3 0x14200 pgzero zerothread 59266 195530 0 0 3 0x14200 aiodoned aiodoned 90685 412198 0 0 3 0x14200 syncer update 22871 476367 0 0 3 0x14200 cleaner cleaner 9998 102978 0 0 3 0x14200 reaper reaper 98535 375683 0 0 3 0x14200 pgdaemon pagedaemon 36822 304160 0 0 3 0x14200 bored crynlk 20292 51558 0 0 3 0x14200 bored crypto 86818 455869 0 0 3 0x40014200 acpi0 acpi0 31490 113213 0 0 3 0x40014200 idle1 32798 128243 0 0 3 0x14200 bored softnet 11926 125671 0 0 3 0x14200 bored systqmp 79851 250450 0 0 3 0x14200 bored systq 36872 6293 0 0 3 0x40014200 bored softclock 93408 62452 0 0 3 0x40014200 idle0 70875 490997 0 0 3 0x14200 bored smr 1 409000 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 1: exclusive sched_lock &sched_lock r = 0 (0xffffffff82662628) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 sched_idle+0x19e sys/kern/kern_sched.c:165 #2 proc_trampoline+0x1c Process 40717 (syz-executor.0) thread 0xffff800020abf8c8 (234318) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff826491e0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x38f sys/kern/sched_bsd.c:441 #3 sleep_finish+0x113 sys/kern/kern_synch.c:373 #4 tsleep+0x198 sleep_finish_timeout sys/kern/kern_synch.c:397 [inline] #4 tsleep+0x198 sleep_finish_all sys/kern/kern_synch.c:183 [inline] #4 tsleep+0x198 sys/kern/kern_synch.c:152 #5 biowait+0xa1 sys/kern/vfs_bio.c:1231 #6 bwrite+0x1e1 sys/kern/vfs_bio.c:747 #7 ffs_update+0x2c2 sys/ufs/ffs/ffs_inode.c:113 #8 ufs_mkdir+0x66e sys/ufs/ufs/ufs_vnops.c:1234 #9 VOP_MKDIR+0xce sys/kern/vfs_vops.c:449 #10 domkdirat+0x121 sys/kern/vfs_syscalls.c:2983 #11 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #11 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #12 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b8be0a8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:561 #5 vget+0x1c3 sys/kern/vfs_subr.c:672 #6 ufs_ihashget+0x141 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x74 sys/ufs/ffs/ffs_vfsops.c:1323 #8 ffs_inode_alloc+0x1cf sys/ufs/ffs/ffs_alloc.c:392 #9 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1164 #10 VOP_MKDIR+0xce sys/kern/vfs_vops.c:449 #11 domkdirat+0x121 sys/kern/vfs_syscalls.c:2983 #12 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #12 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #13 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b8be818) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:561 #5 vfs_lookup+0xec sys/kern/vfs_lookup.c:418 #6 namei+0x61c sys/kern/vfs_lookup.c:248 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:2968 #8 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #9 Xsyscall+0x128 Process 84141 (syz-execprog) thread 0xffff800020abe018 (128018) exclusive rrwlock inode r = 0 (0xfffffd806b8be928) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:561 #5 vget+0x1c3 sys/kern/vfs_subr.c:672 #6 ufs_ihashget+0x141 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x74 sys/ufs/ffs/ffs_vfsops.c:1323 #8 ufs_lookup+0x1575 sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90 #10 vfs_lookup+0x7a5 sys/kern/vfs_lookup.c:567 #11 namei+0x61c sys/kern/vfs_lookup.c:248 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1785 #13 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #13 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b8be1b8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:561 #5 vfs_lookup+0xec sys/kern/vfs_lookup.c:418 #6 namei+0x61c sys/kern/vfs_lookup.c:248 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1785 #8 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9452 6383K 6387K 78643K 13569 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 61 2K 3K 78643K 26789 0 0 ifaddr 28 20K 30K 78643K 3955 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 2073 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1181 74K 74K 78643K 1976 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 2 0K 0K 78643K 2 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 3 5K 25K 78643K 10488 0 0 proc 52 50K 83K 78643K 24574 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 11 0K 2K 78643K 6677 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 18 79K 79K 78643K 18 0 0 exec 0 0K 1K 78643K 8064 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 72 12K 21K 78643K 35154 0 0 UVM aobj 2 2K 2K 78643K 2 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 NDP 4 0K 0K 78643K 1822 0 0 temp 40 3538K 3602K 78643K 72187 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 1214 0 1212 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 1227 0 1225 1 0 1 1 0 8 0 rtentry 112 6689 0 6667 2 0 2 2 0 8 1 unpcb 120 1609 0 1599 1 0 1 1 0 8 0 syncache 264 5 0 5 2 2 0 1 0 8 0 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 2453 0 2447 1 0 1 1 0 8 0 nd6 48 1818 0 1818 1 0 1 1 0 8 1 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 12 0 7 2 1 1 1 0 8 0 pfstkey 112 12 0 7 2 1 1 1 0 8 0 pfstate 328 12 0 7 2 1 1 1 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 30011 0 29914 14 1 13 13 0 8 6 art_table 32 30012 0 29914 2 0 2 2 0 8 1 art_node 16 6688 0 6668 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 5028 0 3597 47 0 47 47 0 8 0 ffsino 272 5028 0 3597 96 0 96 96 0 8 0 nchpl 144 10213 0 8581 62 1 61 62 0 8 0 uvmvnodes 72 5038 0 0 92 0 92 92 0 8 0 vnodes 200 5038 0 0 266 0 266 266 0 8 0 namei 1024 76100 0 76099 2 1 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 18633 0 18633 67 66 1 7 0 8 1 plimitpl 152 620 0 613 1 0 1 1 0 8 0 sigapl 432 8880 0 8867 3 0 3 3 0 8 1 futexpl 56 7053 0 7053 1 0 1 1 0 8 1 knotepl 112 12139 0 12118 1 0 1 1 0 8 0 kqueuepl 104 2 0 0 1 0 1 1 0 8 0 pipepl 112 4994 0 4979 2 1 1 1 0 8 0 fdescpl 488 8881 0 8867 3 0 3 3 0 8 0 filepl 152 20235 0 20171 3 0 3 3 0 8 0 lockfpl 104 6 0 6 1 1 0 1 0 8 0 lockfspl 48 3 0 3 1 1 0 1 0 8 0 sessionpl 112 624 0 614 1 0 1 1 0 8 0 pgrppl 48 624 0 614 1 0 1 1 0 8 0 ucredpl 96 52 0 43 1 0 1 1 0 8 0 zombiepl 144 8867 0 8867 2 1 1 1 0 8 1 processpl 896 8896 0 8867 4 0 4 4 0 8 0 procpl 632 10120 0 10082 4 0 4 4 0 8 0 srpgc 64 1212 0 1212 1 0 1 1 0 8 1 sockpl 384 5289 0 5271 3 0 3 3 0 8 1 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 56 0 0 7 0 7 7 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 215 0 0 12 0 12 12 0 8 0 bufpl 256 7436 0 1166 392 0 392 392 0 8 0 anonpl 16 498378 0 495745 15 3 12 13 0 124 0 amapchunkpl 152 105339 0 105253 6 0 6 6 0 158 1 amappl16 192 9235 0 9151 6 0 6 6 0 8 0 amappl15 184 658 0 656 1 0 1 1 0 8 0 amappl14 176 4853 0 4844 1 0 1 1 0 8 0 amappl13 168 467 0 467 2 1 1 1 0 8 1 amappl12 160 763 0 762 2 1 1 1 0 8 0 amappl11 152 2261 0 2246 1 0 1 1 0 8 0 amappl10 144 1782 0 1777 1 0 1 1 0 8 0 amappl9 136 8779 0 8777 1 0 1 1 0 8 0 amappl8 128 6103 0 6089 1 0 1 1 0 8 0 amappl7 120 2833 0 2824 1 0 1 1 0 8 0 amappl6 112 872 0 865 1 0 1 1 0 8 0 amappl5 104 4559 0 4545 1 0 1 1 0 8 0 amappl4 96 9063 0 9034 2 1 1 2 0 8 0 amappl3 88 1642 0 1632 1 0 1 1 0 8 0 amappl2 80 25648 0 25587 4 2 2 3 0 8 0 amappl1 72 304963 0 304549 27 17 10 20 0 8 0 amappl 80 19361 0 19331 1 0 1 1 0 84 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma64 64 259 0 259 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 17 0 17 1 1 0 1 0 8 0 aobjpl 64 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 8881 0 8867 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 8881 0 8867 1 0 1 1 0 8 0 vmmpekpl 168 63639 0 63613 2 0 2 2 0 8 0 vmmpepl 168 819082 0 818088 95 40 55 78 0 357 6 vmsppl 368 8880 0 8867 2 0 2 2 0 8 0 pdppl 4096 17769 0 17734 6 0 6 6 0 8 1 pvpl 32 2110837 0 2105675 108 56 52 102 0 265 4 pmappl 232 8880 0 8867 2 0 2 2 0 8 1 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 541 0 5 16 0 16 16 0 8 0