panic: fifo_badop called Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *329264 5452 32767 0x10 0 0 syz-executor.0 160940 6886 32767 0x10 0 1K syz-executor.1 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(ffff800024f473f8) at fifo_badop+0x14 sys/miscfs/fifofs/fifo_vnops.c:491 VOP_STRATEGY(fffffd806fc48700) at VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:727 bwrite(fffffd806fc48700) at bwrite+0x1b9 sys/kern/vfs_bio.c:738 VOP_BWRITE(fffffd806fc48700) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:739 ufs_mkdir(ffff800024f47680) at ufs_mkdir+0x6b7 sys/ufs/ufs/ufs_vnops.c:1250 VOP_MKDIR(fffffd80712d61a0,ffff800024f477e0,ffff800024f47830,ffff800024f47710) at VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 domkdirat(ffff800020a88508,ffffff9c,7f7ffffe7a00,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:2983 syscall(ffff800024f479b0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024f479b0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,88,7f7ffffe7a00,88,0,7f7ffffe7a24) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe7a70, 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(ffff800024f473f8) at fifo_badop+0x14 sys/miscfs/fifofs/fifo_vnops.c:491 VOP_STRATEGY(fffffd806fc48700) at VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:727 bwrite(fffffd806fc48700) at bwrite+0x1b9 sys/kern/vfs_bio.c:738 VOP_BWRITE(fffffd806fc48700) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:739 ufs_mkdir(ffff800024f47680) at ufs_mkdir+0x6b7 sys/ufs/ufs/ufs_vnops.c:1250 VOP_MKDIR(fffffd80712d61a0,ffff800024f477e0,ffff800024f47830,ffff800024f47710) at VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 domkdirat(ffff800020a88508,ffffff9c,7f7ffffe7a00,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:2983 syscall(ffff800024f479b0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024f479b0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,88,7f7ffffe7a00,88,0,7f7ffffe7a24) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe7a70, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800024f47320 rbx 0xffff800024f473d0 rdx 0xffff800020a88508 rcx 0 rax 0 r8 0xffffffff8101c8df kprintf+0x16f r9 0x1 r10 0x25 r11 0xe51edc67ee5281cb r12 0x3000000008 r13 0xffff800024f47330 r14 0x100 r15 0x1 rip 0xffffffff812e7d28 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024f47310 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=329264 stat=onproc flags process=10 proc=0 pri=17, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020a88ee8,0xffffffff8261fc78 process=0xffff800020a8b510 user=0xffff800024f42000, vmspace=0xfffffd806e8f5a18 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND * 5452 329264 9381 32767 7 0x10 syz-executor.0 9381 98590 65813 0 3 0x82 wait syz-executor.0 6886 160940 28340 32767 7 0x10 syz-executor.1 28340 495629 65813 0 3 0x82 wait syz-executor.1 80348 131324 0 0 3 0x14200 bored sosplice 65813 153186 68824 0 3 0x82 thrsleep syz-fuzzer 65813 181103 68824 0 3 0x4000082 nanosleep syz-fuzzer 65813 265207 68824 0 3 0x4000082 thrsleep syz-fuzzer 65813 166004 68824 0 3 0x4000082 thrsleep syz-fuzzer 65813 398271 68824 0 3 0x4000082 thrsleep syz-fuzzer 65813 114417 68824 0 3 0x4000082 thrsleep syz-fuzzer 65813 429670 68824 0 3 0x4000082 thrsleep syz-fuzzer 65813 371452 68824 0 3 0x4000082 thrsleep syz-fuzzer 65813 36842 68824 0 3 0x4000082 kqread syz-fuzzer 65813 75178 68824 0 3 0x4000082 thrsleep syz-fuzzer 65813 357058 68824 0 3 0x4000082 nanosleep syz-fuzzer 68824 297161 67374 0 3 0x10008a pause ksh 67374 193564 14001 0 3 0x92 select sshd 38846 308703 1 0 3 0x100083 ttyin getty 14001 34650 1 0 3 0x80 select sshd 35307 276337 21163 73 3 0x100090 kqread syslogd 21163 216729 1 0 3 0x100082 netio syslogd 29352 357713 1 77 3 0x100090 poll dhclient 69864 180619 1 0 3 0x80 poll dhclient 81949 258680 0 0 3 0x14200 pgzero zerothread 74333 489294 0 0 3 0x14200 aiodoned aiodoned 43915 29495 0 0 3 0x14200 syncer update 21947 228871 0 0 3 0x14200 cleaner cleaner 79009 89570 0 0 3 0x14200 reaper reaper 39808 29253 0 0 3 0x14200 pgdaemon pagedaemon 64724 72838 0 0 3 0x14200 bored crynlk 97361 182479 0 0 3 0x14200 bored crypto 11311 139154 0 0 3 0x40014200 acpi0 acpi0 13854 91973 0 0 3 0x40014200 idle1 16766 307510 0 0 3 0x14200 bored softnet 14571 225082 0 0 3 0x14200 bored systqmp 20736 144225 0 0 3 0x14200 bored systq 75162 341706 0 0 3 0x40014200 bored softclock 51450 22235 0 0 3 0x40014200 idle0 47010 24545 0 0 3 0x14200 bored smr 1 393751 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 5452 (syz-executor.0) thread 0xffff800020a88508 (329264) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82673760) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x392 sys/kern/sched_bsd.c:436 #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+0x1e4 sys/kern/vfs_bio.c:747 #7 ffs_update+0x2c2 sys/ufs/ffs/ffs_inode.c:113 #8 ufs_mkdir+0x665 sys/ufs/ufs/ufs_vnops.c:1234 #9 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 #10 domkdirat+0x121 sys/kern/vfs_syscalls.c:2983 #11 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #11 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #12 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80677eba38) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x447 sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:574 #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+0xc6 sys/kern/vfs_vops.c:450 #11 domkdirat+0x121 sys/kern/vfs_syscalls.c:2983 #12 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #12 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #13 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e588f78) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x447 sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:574 #5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419 #6 namei+0x63c sys/kern/vfs_lookup.c:249 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:2968 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #9 Xsyscall+0x128 Process 6886 (syz-executor.1) thread 0xffff800020a898c8 (160940) exclusive rrwlock inode r = 0 (0xfffffd806e585a30) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x447 sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:574 #5 vn_closefile+0xc7 vn_close sys/kern/vfs_vnops.c:301 [inline] #5 vn_closefile+0xc7 sys/kern/vfs_vnops.c:613 #6 fdrop+0xc2 sys/kern/kern_descrip.c:1273 #7 closef+0x11d sys/kern/kern_descrip.c:1257 #8 fdrelease+0xba sys/kern/kern_descrip.c:757 #9 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #9 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #10 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9470 6322K 6322K 78643K 11852 0 0 pcb 13 12K 14K 78643K 17 0 0 rtable 109 3K 3K 78643K 11086 0 0 ifaddr 38 18K 21K 78643K 1636 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 443 0 0 iov 0 0K 32K 78643K 4391 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 7025 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 87 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 3558 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 33K 78643K 10513 0 0 sigio 0 0K 0K 78643K 190 0 0 proc 48 50K 83K 78643K 12276 0 0 subproc 34 2K 2K 78643K 4437 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 1K 78643K 1275 0 0 in_multi 33 2K 2K 78643K 3113 0 0 ether_multi 1 0K 0K 78643K 37 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 108 477K 477K 78643K 108 0 0 exec 0 0K 1K 78643K 4565 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 159 25K 34K 78643K 38485 0 0 UVM aobj 130 9K 9K 78643K 138 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 0K 78643K 1949 0 0 NDP 7 0K 0K 78643K 786 0 0 temp 121 3562K 3673K 78643K 55189 0 0 kqueue 0 0K 0K 78643K 233 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 64 539 0 533 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 1717 0 1715 1 0 1 1 0 8 0 rtentry 112 2653 0 2607 2 0 2 2 0 8 0 unpcb 120 6934 0 6916 15 13 2 2 0 8 1 syncache 264 66 0 66 26 26 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 23 0 23 11 11 0 1 0 8 0 tcpcb 544 13696 0 13692 134 132 2 15 0 8 1 ipq 40 117 0 117 42 41 1 1 0 8 1 ipqe 40 3285 0 3285 42 41 1 1 0 8 1 inpcb 280 21678 0 21669 142 133 9 14 0 8 8 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 6 0 6 1 1 0 1 0 8 0 nd6 48 523 0 519 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 11722 0 11477 18 2 16 16 0 8 0 art_table 32 11723 0 11477 2 0 2 2 0 8 0 art_node 16 2652 0 2610 1 0 1 1 0 8 0 sysvmsgpl 40 63 0 44 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 3556 0 3546 1 0 1 1 0 8 0 shmpl 112 136 0 8 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 12338 0 10908 49 2 47 47 0 8 0 ffsino 272 12338 0 10908 99 3 96 96 0 8 0 nchpl 144 25326 0 23706 61 0 61 61 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 208 5926 0 0 312 0 312 312 0 8 0 namei 1024 119725 0 119724 3 2 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 82534 0 82533 89 86 3 7 0 8 2 plimitpl 152 1792 0 1783 1 0 1 1 0 8 0 sigapl 432 9907 0 9893 15 13 2 3 0 8 0 futexpl 56 190310 0 190310 3 2 1 1 0 8 1 knotepl 112 8145 0 8126 26 24 2 3 0 8 1 kqueuepl 104 5674 0 5672 35 34 1 4 0 8 0 pipepl 112 8448 0 8429 21 19 2 2 0 8 1 fdescpl 488 9908 0 9893 3 0 3 3 0 8 1 filepl 152 94293 0 94196 155 143 12 14 0 8 8 lockfpl 104 4261 0 4260 1 0 1 1 0 8 0 lockfspl 48 1696 0 1695 1 0 1 1 0 8 0 sessionpl 112 276 0 266 1 0 1 1 0 8 0 pgrppl 48 341 0 331 1 0 1 1 0 8 0 ucredpl 96 17740 0 17731 1 0 1 1 0 8 0 zombiepl 144 9893 0 9893 3 2 1 1 0 8 1 processpl 896 9924 0 9893 4 0 4 4 0 8 0 procpl 632 26375 0 26334 7 2 5 5 0 8 1 srpgc 64 518 0 518 19 18 1 1 0 8 1 sosppl 128 250 0 250 37 36 1 1 0 8 1 sockpl 384 30581 0 30554 212 199 13 23 0 8 8 mcl64k 65536 54 0 0 5 1 4 4 0 8 0 mcl16k 16384 25 0 0 3 0 3 3 0 8 0 mcl12k 12288 41 0 0 2 0 2 2 0 8 0 mcl9k 9216 39 0 0 2 0 2 2 0 8 0 mcl8k 8192 33 0 0 4 1 3 3 0 8 0 mcl4k 4096 25 0 0 3 0 3 3 0 8 0 mcl2k2 2112 13 0 0 1 0 1 1 0 8 0 mcl2k 2048 157 0 0 18 0 18 18 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1049 0 0 20 0 20 20 0 8 0 bufpl 256 29668 0 22624 441 0 441 441 0 8 0 anonpl 16 1328711 0 1318900 228 162 66 67 0 124 10 amapchunkpl 152 101470 0 101363 234 224 10 19 0 158 4 amappl16 192 45300 0 44630 289 244 45 49 0 8 7 amappl15 184 1118 0 1118 24 24 0 1 0 8 0 amappl14 176 3018 0 3010 1 0 1 1 0 8 0 amappl13 168 852 0 852 26 26 0 1 0 8 0 amappl12 160 1126 0 1120 1 0 1 1 0 8 0 amappl11 152 1946 0 1935 1 0 1 1 0 8 0 amappl10 144 1173 0 1169 1 0 1 1 0 8 0 amappl9 136 4917 0 4911 1 0 1 1 0 8 0 amappl8 128 3657 0 3565 4 0 4 4 0 8 0 amappl7 120 2157 0 2145 1 0 1 1 0 8 0 amappl6 112 1259 0 1242 1 0 1 1 0 8 0 amappl5 104 2929 0 2920 1 0 1 1 0 8 0 amappl4 96 9653 0 9618 2 1 1 2 0 8 0 amappl3 88 2181 0 2168 1 0 1 1 0 8 0 amappl2 80 58494 0 58429 3 1 2 3 0 8 0 amappl1 72 285518 0 285105 41 32 9 20 0 8 0 amappl 80 30987 0 30951 2 0 2 2 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 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 17 0 17 1 1 0 1 0 8 0 aobjpl 64 137 0 8 3 0 3 3 0 8 0 uaddrrnd 24 9908 0 9893 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 9908 0 9893 1 0 1 1 0 8 0 vmmpekpl 168 96598 0 96566 2 0 2 2 0 8 0 vmmpepl 168 1382308 0 1380473 358 242 116 126 0 357 20 vmsppl 368 9907 0 9893 2 0 2 2 0 8 0 pdppl 4096 19823 0 19786 8 2 6 6 0 8 1 pvpl 32 3568330 0 3555367 515 351 164 174 0 265 26 pmappl 232 9907 0 9893 36 34 2 2 0 8 1 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 764 0 145 18 0 18 18 0 8 0