login: panic: fifo_badop called Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *117362 91237 32767 0x10 0 0K syz-executor.1 239782 81251 32767 0x10 0 1 syz-executor.0 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(ffff800024dc5788) at fifo_badop+0x14 sys/miscfs/fifofs/fifo_vnops.c:491 VOP_STRATEGY(fffffd8067029d00) at VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:727 bwrite(fffffd8067029d00) at bwrite+0x1b9 sys/kern/vfs_bio.c:738 VOP_BWRITE(fffffd8067029d00) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:739 ufs_mkdir(ffff800024dc5a10) at ufs_mkdir+0x6b7 sys/ufs/ufs/ufs_vnops.c:1250 VOP_MKDIR(fffffd8067ffa908,ffff800024dc5b70,ffff800024dc5bc0,ffff800024dc5aa0) at VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 domkdirat(ffff800020a89650,ffffff9c,7f7ffffbe2c0,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:2983 syscall(ffff800024dc5d40) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024dc5d40) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,88,7f7ffffbe2c0,88,0,7f7ffffbe2e4) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbe330, 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(ffff800024dc5788) at fifo_badop+0x14 sys/miscfs/fifofs/fifo_vnops.c:491 VOP_STRATEGY(fffffd8067029d00) at VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:727 bwrite(fffffd8067029d00) at bwrite+0x1b9 sys/kern/vfs_bio.c:738 VOP_BWRITE(fffffd8067029d00) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:739 ufs_mkdir(ffff800024dc5a10) at ufs_mkdir+0x6b7 sys/ufs/ufs/ufs_vnops.c:1250 VOP_MKDIR(fffffd8067ffa908,ffff800024dc5b70,ffff800024dc5bc0,ffff800024dc5aa0) at VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 domkdirat(ffff800020a89650,ffffff9c,7f7ffffbe2c0,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:2983 syscall(ffff800024dc5d40) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024dc5d40) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,88,7f7ffffbe2c0,88,0,7f7ffffbe2e4) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbe330, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800024dc56b0 rbx 0xffff800024dc5760 rdx 0xffff800020a89650 rcx 0 rax 0 r8 0xffffffff813e1fff kprintf+0x16f r9 0x1 r10 0x25 r11 0x80491887e279dd30 r12 0x3000000008 r13 0xffff800024dc56c0 r14 0x100 r15 0x1 rip 0xffffffff81b7ee58 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024dc56a0 ss 0 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=117362 stat=onproc flags process=10 proc=0 pri=17, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020a88780,0xffffffff8265b158 process=0xffff800020a8b190 user=0xffff800024dc0000, vmspace=0xfffffd807f00ab80 estcpu=3, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *91237 117362 89948 32767 7 0x10 syz-executor.1 89948 264992 43029 0 3 0x82 wait syz-executor.1 81251 239782 64490 32767 7 0x10 syz-executor.0 64490 232750 43029 0 3 0x82 wait syz-executor.0 87940 480517 0 0 3 0x14200 bored sosplice 43029 127944 31719 0 3 0x82 thrsleep syz-fuzzer 43029 128094 31719 0 3 0x4000082 nanosleep syz-fuzzer 43029 271265 31719 0 2 0x4000002 syz-fuzzer 43029 200651 31719 0 3 0x4000082 thrsleep syz-fuzzer 43029 381902 31719 0 3 0x4000082 thrsleep syz-fuzzer 43029 190750 31719 0 3 0x4000082 thrsleep syz-fuzzer 43029 387719 31719 0 3 0x4000082 kqread syz-fuzzer 43029 463866 31719 0 3 0x4000082 thrsleep syz-fuzzer 43029 284570 31719 0 3 0x4000082 thrsleep syz-fuzzer 43029 21478 31719 0 3 0x4000082 thrsleep syz-fuzzer 31719 193826 76936 0 3 0x10008a pause ksh 76936 46204 38217 0 3 0x92 select sshd 99874 522597 1 0 3 0x100083 ttyin getty 38217 433420 1 0 3 0x80 select sshd 97599 174948 56674 73 3 0x100090 kqread syslogd 56674 479534 1 0 3 0x100082 netio syslogd 46748 316439 1 77 3 0x100090 poll dhclient 51341 20363 1 0 3 0x80 poll dhclient 66187 473310 0 0 3 0x14200 pgzero zerothread 41874 212024 0 0 3 0x14200 aiodoned aiodoned 64225 84688 0 0 3 0x14200 syncer update 61477 327113 0 0 3 0x14200 cleaner cleaner 20803 54789 0 0 3 0x14200 reaper reaper 48914 305411 0 0 3 0x14200 pgdaemon pagedaemon 43484 76590 0 0 3 0x14200 bored crynlk 19744 416198 0 0 3 0x14200 bored crypto 48780 197496 0 0 3 0x40014200 acpi0 acpi0 61637 3202 0 0 3 0x40014200 idle1 10440 188651 0 0 3 0x14200 bored softnet 50506 340984 0 0 3 0x14200 bored systqmp 49695 462118 0 0 3 0x14200 bored systq 98655 167238 0 0 3 0x40014200 bored softclock 76959 297455 0 0 3 0x40014200 idle0 63793 124791 0 0 3 0x14200 bored smr 1 163950 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 91237 (syz-executor.1) thread 0xffff800020a89650 (117362) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8265aa28) #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 (0xfffffd8064efdc48) #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 (0xfffffd8064efda28) #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 81251 (syz-executor.0) thread 0xffff800020a88c70 (239782) exclusive rrwlock inode r = 0 (0xfffffd8064efd3c8) #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 10632 0 0 pcb 13 10K 12K 78643K 15 0 0 rtable 105 3K 3K 78643K 858 0 0 ifaddr 35 10K 10K 78643K 129 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 37 0 0 iov 0 0K 32K 78643K 82 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 1535 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 6 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 195 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 33K 78643K 615 0 0 sigio 0 0K 0K 78643K 7 0 0 proc 48 50K 71K 78643K 1022 0 0 subproc 34 2K 2K 78643K 289 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 62 0 0 in_multi 33 2K 2K 78643K 202 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 108 477K 477K 78643K 108 0 0 exec 0 0K 1K 78643K 435 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 114 22K 26K 78643K 3110 0 0 UVM aobj 46 7K 7K 78643K 48 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 34 0 0 NDP 7 0K 0K 78643K 54 0 0 temp 121 3558K 3634K 78643K 6181 0 0 kqueue 0 0K 0K 78643K 15 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 37 0 31 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 168 0 166 1 0 1 1 0 8 0 rtentry 112 196 0 152 2 0 2 2 0 8 0 unpcb 120 455 0 447 1 0 1 1 0 8 0 syncache 264 9 0 9 3 3 0 1 0 8 0 tcpqe 32 2 0 2 2 2 0 1 0 8 0 tcpcb 544 437 0 433 15 12 3 14 0 8 2 ipq 40 6 0 6 3 3 0 1 0 8 0 ipqe 40 108 0 108 3 3 0 1 0 8 0 inpcb 280 793 0 786 10 7 3 9 0 8 2 nd6 48 34 0 30 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 879 0 663 14 0 14 14 0 8 0 art_table 32 880 0 663 2 0 2 2 0 8 0 art_node 16 195 0 155 1 0 1 1 0 8 0 sysvmsgpl 40 86 0 47 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 191 0 181 1 0 1 1 0 8 0 shmpl 112 46 0 2 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1967 0 565 46 0 46 46 0 8 0 ffsino 272 1967 0 565 94 0 94 94 0 8 0 nchpl 144 3066 0 1461 60 0 60 60 0 8 0 uvmvnodes 72 2265 0 0 42 0 42 42 0 8 0 vnodes 208 2265 0 0 120 0 120 120 0 8 0 namei 1024 10724 0 10723 1 0 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 9057 0 9057 13 10 3 7 0 8 3 plimitpl 152 107 0 98 1 0 1 1 0 8 0 sigapl 432 741 0 727 3 1 2 3 0 8 0 futexpl 56 10441 0 10441 1 0 1 1 0 8 1 knotepl 112 481 0 462 1 0 1 1 0 8 0 kqueuepl 104 484 0 482 4 3 1 4 0 8 0 pipepl 112 506 0 487 2 1 1 2 0 8 0 fdescpl 488 742 0 727 3 0 3 3 0 8 1 filepl 152 6355 0 6257 14 8 6 12 0 8 2 lockfpl 104 672 0 671 1 0 1 1 0 8 0 lockfspl 48 63 0 62 1 0 1 1 0 8 0 sessionpl 112 32 0 22 1 0 1 1 0 8 0 pgrppl 48 44 0 34 1 0 1 1 0 8 0 ucredpl 96 997 0 988 1 0 1 1 0 8 0 zombiepl 144 727 0 727 1 0 1 1 0 8 1 processpl 896 758 0 727 4 0 4 4 0 8 0 procpl 632 1775 0 1735 5 0 5 5 0 8 1 srpgc 64 30 0 30 3 2 1 1 0 8 1 sosppl 128 13 0 13 4 3 1 1 0 8 1 sockpl 384 1422 0 1405 17 13 4 14 0 8 2 mcl64k 65536 13 0 0 2 0 2 2 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 10 0 0 1 0 1 1 0 8 0 mcl9k 9216 11 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 8 0 0 1 0 1 1 0 8 0 mcl2k 2048 129 0 0 16 1 15 16 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 317 0 0 19 0 19 19 0 8 0 bufpl 256 7462 0 1302 385 0 385 385 0 8 0 anonpl 16 105529 0 96235 68 12 56 57 0 124 8 amapchunkpl 152 6842 0 6721 16 6 10 11 0 158 4 amappl16 192 3560 0 2952 55 18 37 43 0 8 6 amappl15 184 90 0 88 3 2 1 1 0 8 0 amappl14 176 155 0 151 1 0 1 1 0 8 0 amappl13 168 68 0 68 3 3 0 1 0 8 0 amappl12 160 69 0 67 1 0 1 1 0 8 0 amappl11 152 199 0 183 1 0 1 1 0 8 0 amappl10 144 71 0 66 1 0 1 1 0 8 0 amappl9 136 803 0 797 1 0 1 1 0 8 0 amappl8 128 345 0 305 2 0 2 2 0 8 0 amappl7 120 165 0 155 1 0 1 1 0 8 0 amappl6 112 151 0 142 1 0 1 1 0 8 0 amappl5 104 306 0 296 1 0 1 1 0 8 0 amappl4 96 941 0 911 1 0 1 1 0 8 0 amappl3 88 195 0 190 1 0 1 1 0 8 0 amappl2 80 4047 0 3986 3 1 2 3 0 8 0 amappl1 72 28832 0 28418 26 17 9 20 0 8 0 amappl 80 2234 0 2195 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 47 0 2 1 0 1 1 0 8 0 uaddrrnd 24 742 0 727 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 742 0 727 1 0 1 1 0 8 0 vmmpekpl 168 10615 0 10583 2 0 2 2 0 8 0 vmmpepl 168 105348 0 103650 129 24 105 105 0 357 25 vmsppl 368 741 0 727 2 0 2 2 0 8 0 pdppl 4096 1491 0 1454 6 0 6 6 0 8 1 pvpl 32 315928 0 303516 166 28 138 147 0 265 17 pmappl 232 741 0 727 5 3 2 2 0 8 1 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 563 0 15 16 0 16 16 0 8 0