panic: fifo_badop called Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 28501 41403 32767 0x10 0 0K syz-executor.1 365029 89326 0 0x2 0x4000000 1 syz-fuzzer 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(ffff800024db5678) at fifo_badop+0x14 sys/miscfs/fifofs/fifo_vnops.c:491 VOP_STRATEGY(fffffd8066fb2100) at VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:727 bwrite(fffffd8066fb2100) at bwrite+0x1b9 sys/kern/vfs_bio.c:738 VOP_BWRITE(fffffd8066fb2100) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:739 ufs_mkdir(ffff800024db5900) at ufs_mkdir+0x6b7 sys/ufs/ufs/ufs_vnops.c:1250 VOP_MKDIR(fffffd8076e44df0,ffff800024db5a60,ffff800024db5ab0,ffff800024db5990) at VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 domkdirat(ffff800020a88780,ffffff9c,7f7ffffc35f0,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:2983 syscall(ffff800024db5c30) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024db5c30) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,88,7f7ffffc35f0,88,0,7f7ffffc3614) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc3660, 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(ffff800024db5678) at fifo_badop+0x14 sys/miscfs/fifofs/fifo_vnops.c:491 VOP_STRATEGY(fffffd8066fb2100) at VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:727 bwrite(fffffd8066fb2100) at bwrite+0x1b9 sys/kern/vfs_bio.c:738 VOP_BWRITE(fffffd8066fb2100) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:739 ufs_mkdir(ffff800024db5900) at ufs_mkdir+0x6b7 sys/ufs/ufs/ufs_vnops.c:1250 VOP_MKDIR(fffffd8076e44df0,ffff800024db5a60,ffff800024db5ab0,ffff800024db5990) at VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 domkdirat(ffff800020a88780,ffffff9c,7f7ffffc35f0,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:2983 syscall(ffff800024db5c30) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024db5c30) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,88,7f7ffffc35f0,88,0,7f7ffffc3614) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc3660, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800024db55a0 rbx 0xffff800024db5650 rdx 0xffff800020a88780 rcx 0 rax 0 r8 0xffffffff8100e32f kprintf+0x16f r9 0x1 r10 0x25 r11 0xbde5ab3938a84d96 r12 0x3000000008 r13 0xffff800024db55b0 r14 0x100 r15 0x1 rip 0xffffffff8203e078 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024db5590 ss 0 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=28501 stat=onproc flags process=10 proc=0 pri=17, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020a89650,0xffffffff82676ab8 process=0xffff800020a8b510 user=0xffff800024db0000, vmspace=0xfffffd807f00a8a0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *41403 28501 1235 32767 7 0x10 syz-executor.1 1235 65140 89326 0 3 0x82 wait syz-executor.1 40620 49391 26756 32767 2 0x10 syz-executor.0 26756 443776 89326 0 3 0x82 wait syz-executor.0 21338 1797 0 0 3 0x14200 bored sosplice 89326 383942 88495 0 3 0x82 thrsleep syz-fuzzer 89326 378279 88495 0 3 0x4000082 nanosleep syz-fuzzer 89326 88214 88495 0 3 0x4000082 thrsleep syz-fuzzer 89326 308560 88495 0 3 0x4000082 thrsleep syz-fuzzer 89326 325091 88495 0 3 0x4000082 thrsleep syz-fuzzer 89326 365029 88495 0 7 0x4000002 syz-fuzzer 89326 208224 88495 0 3 0x4000082 thrsleep syz-fuzzer 89326 26330 88495 0 3 0x4000082 thrsleep syz-fuzzer 89326 155531 88495 0 3 0x4000082 thrsleep syz-fuzzer 89326 342760 88495 0 2 0x4000002 syz-fuzzer 88495 353206 64931 0 3 0x10008a pause ksh 64931 369125 30010 0 3 0x92 select sshd 86903 478674 1 0 3 0x100083 ttyin getty 30010 320280 1 0 3 0x80 select sshd 28835 486171 86307 73 3 0x100090 kqread syslogd 86307 11135 1 0 3 0x100082 netio syslogd 50765 482708 1 77 3 0x100090 poll dhclient 12993 37740 1 0 3 0x80 poll dhclient 39941 91102 0 0 2 0x14200 zerothread 37112 199825 0 0 3 0x14200 aiodoned aiodoned 36419 83592 0 0 3 0x14200 syncer update 1932 453354 0 0 3 0x14200 cleaner cleaner 22982 27799 0 0 3 0x14200 reaper reaper 91572 455617 0 0 3 0x14200 pgdaemon pagedaemon 84466 520202 0 0 3 0x14200 bored crynlk 58027 169731 0 0 3 0x14200 bored crypto 54648 184064 0 0 3 0x40014200 acpi0 acpi0 49169 73076 0 0 3 0x40014200 idle1 15997 236199 0 0 3 0x14200 bored softnet 79999 347186 0 0 3 0x14200 bored systqmp 57287 372973 0 0 3 0x14200 bored systq 96758 569 0 0 3 0x40014200 bored softclock 54578 441988 0 0 3 0x40014200 idle0 88662 19624 0 0 3 0x14200 bored smr 1 76894 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 41403 (syz-executor.1) thread 0xffff800020a88780 (28501) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82647ad0) #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 (0xfffffd80706b71a8) #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 (0xfffffd807aa053d8) #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 40620 (syz-executor.0) thread 0xffff800020a88ee8 (49391) exclusive rrwlock inode r = 0 (0xfffffd80706b7f78) #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 9471 6323K 6323K 78643K 11853 0 0 pcb 13 12K 14K 78643K 17 0 0 rtable 111 3K 3K 78643K 11376 0 0 ifaddr 36 18K 21K 78643K 1617 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 528 0 0 iov 0 0K 36K 78643K 2852 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 6804 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 9K 78643K 269 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 1K 1K 78643K 12 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 33K 78643K 12963 0 0 sigio 0 0K 0K 78643K 656 0 0 proc 48 50K 83K 78643K 12297 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 1202 0 0 in_multi 33 2K 2K 78643K 3116 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 114 503K 503K 78643K 114 0 0 exec 0 0K 1K 78643K 4652 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 123 23K 32K 78643K 49725 0 0 UVM aobj 130 4K 4K 78643K 135 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 779 0 0 NDP 7 0K 0K 78643K 786 0 0 temp 121 3558K 3650K 78643K 67175 0 0 kqueue 0 0K 0K 78643K 264 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 64 541 0 534 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 2014 0 2012 1 0 1 1 0 8 0 rtentry 112 2656 0 2609 2 0 2 2 0 8 0 unpcb 120 18901 0 18879 21 20 1 2 0 8 0 syncache 264 101 0 101 44 44 0 1 0 8 0 sackhl 24 3 0 3 3 3 0 1 0 8 0 tcpqe 32 40 0 40 21 21 0 1 0 8 0 tcpcb 544 6157 0 6153 75 74 1 13 0 8 0 ipq 40 126 0 125 52 51 1 1 0 8 0 ipqe 40 4359 0 4358 52 51 1 1 0 8 0 inpcb 280 13578 0 13561 90 88 2 13 0 8 0 ip6q 72 5 0 5 4 4 0 1 0 8 0 ip6af 40 15 0 15 4 4 0 1 0 8 0 nd6 48 524 0 520 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 11681 0 11436 16 0 16 16 0 8 0 art_table 32 11682 0 11436 2 0 2 2 0 8 0 art_node 16 2655 0 2612 1 0 1 1 0 8 0 sysvmsgpl 40 79 0 39 1 0 1 1 0 8 0 semapl 112 10 0 0 1 0 1 1 0 8 0 shmpl 112 133 0 5 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 14986 0 13550 47 0 47 47 0 8 0 ffsino 272 14986 0 13550 99 3 96 97 0 8 0 nchpl 144 31329 0 29709 64 3 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 151769 0 151768 1 0 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 106491 0 106491 92 91 1 5 0 8 1 plimitpl 152 1886 0 1877 1 0 1 1 0 8 0 sigapl 432 12357 0 12343 7 5 2 3 0 8 0 futexpl 56 278786 0 278786 1 0 1 1 0 8 1 knotepl 112 15852 0 15833 28 26 2 3 0 8 1 kqueuepl 104 19192 0 19190 22 21 1 4 0 8 0 pipepl 112 39248 0 39229 50 48 2 4 0 8 1 fdescpl 488 12358 0 12343 3 0 3 3 0 8 1 filepl 152 159053 0 158955 150 144 6 14 0 8 1 lockfpl 104 4928 0 4927 1 0 1 1 0 8 0 lockfspl 48 2079 0 2078 1 0 1 1 0 8 0 sessionpl 112 276 0 266 1 0 1 1 0 8 0 pgrppl 48 367 0 357 1 0 1 1 0 8 0 ucredpl 96 31990 0 31981 1 0 1 1 0 8 0 zombiepl 144 12343 0 12343 1 0 1 1 0 8 1 processpl 896 12374 0 12343 4 0 4 4 0 8 0 procpl 632 36668 0 36628 14 9 5 5 0 8 1 srpgc 64 518 0 518 56 55 1 1 0 8 1 sosppl 128 270 0 270 57 57 0 1 0 8 0 sockpl 384 34683 0 34652 176 171 5 23 0 8 0 mcl64k 65536 84 0 0 5 2 3 3 0 8 0 mcl16k 16384 45 0 0 6 4 2 3 0 8 0 mcl12k 12288 49 0 0 2 0 2 2 0 8 0 mcl9k 9216 33 0 0 3 1 2 2 0 8 0 mcl8k 8192 57 0 0 5 2 3 3 0 8 0 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 11 0 0 1 0 1 1 0 8 0 mcl2k 2048 228 0 0 18 6 12 18 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1553 0 0 23 1 22 22 0 8 0 bufpl 256 38350 0 31306 441 0 441 441 0 8 0 anonpl 16 1551214 0 1541946 241 185 56 65 0 124 0 amapchunkpl 152 118153 0 118050 260 252 8 19 0 158 2 amappl16 192 59472 0 58836 460 425 35 46 0 8 0 amappl15 184 1330 0 1328 31 30 1 1 0 8 0 amappl14 176 4196 0 4192 1 0 1 1 0 8 0 amappl13 168 1429 0 1429 29 28 1 1 0 8 1 amappl12 160 1438 0 1433 1 0 1 1 0 8 0 amappl11 152 1506 0 1495 1 0 1 1 0 8 0 amappl10 144 1539 0 1533 1 0 1 1 0 8 0 amappl9 136 4862 0 4856 1 0 1 1 0 8 0 amappl8 128 3839 0 3786 2 0 2 2 0 8 0 amappl7 120 2572 0 2562 1 0 1 1 0 8 0 amappl6 112 1075 0 1057 1 0 1 1 0 8 0 amappl5 104 3351 0 3340 1 0 1 1 0 8 0 amappl4 96 12049 0 12023 1 0 1 1 0 8 0 amappl3 88 3623 0 3617 1 0 1 1 0 8 0 amappl2 80 80425 0 80364 3 1 2 3 0 8 0 amappl1 72 345158 0 344737 72 62 10 20 0 8 1 amappl 80 41084 0 41049 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 64 134 0 5 3 0 3 3 0 8 0 uaddrrnd 24 12358 0 12343 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 12358 0 12343 1 0 1 1 0 8 0 vmmpekpl 168 193771 0 193738 3 0 3 3 0 8 0 vmmpepl 168 1680424 0 1678665 584 475 109 120 0 357 23 vmsppl 368 12357 0 12343 2 0 2 2 0 8 0 pdppl 4096 24723 0 24686 6 0 6 6 0 8 1 pvpl 32 4855889 0 4843458 796 664 132 165 0 265 2 pmappl 232 12357 0 12343 59 57 2 2 0 8 1 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 707 0 95 18 0 18 18 0 8 0