uvm_fault(0xfffffd806c003580, 0x8, 0, 1) -> e kernel: page fault trap, code=0 Stopped at fifo_write+0x6e: movq 0x8(%rax),%r15 TID PID UID PRFLAGS PFLAGS CPU COMMAND * 25003 78700 0 0x2 0x1 0 syz-executor fifo_write(ffff80002a5551d0) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8071349b00,ffff80002a555280,3,fffffd807f7d78f0) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a4d0f58,fffffd8071349b00,fffffd807f7d78f0,ffff80002a555348,ffff80002a555320) at ktrwriteraw+0x191 sys/kern/kern_ktrace.c:682 ktrstruct(ffff80002a4d0f58,ffffffff82fc9e5e,ffff80002a555440,10) at ktrstruct+0x18b sys/kern/kern_ktrace.c:308 sys_nanosleep(ffff80002a4d0f58,ffff80002a555580,ffff80002a5554d0) at sys_nanosleep+0x109 sys/kern/kern_time.c:292 syscall(ffff80002a555580) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6f9b7715d860, count: 8 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: uvm_fault(0xfffffd806c003580, 0x8, 0, 1) -> e ddb> trace fifo_write(ffff80002a5551d0) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8071349b00,ffff80002a555280,3,fffffd807f7d78f0) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a4d0f58,fffffd8071349b00,fffffd807f7d78f0,ffff80002a555348,ffff80002a555320) at ktrwriteraw+0x191 sys/kern/kern_ktrace.c:682 ktrstruct(ffff80002a4d0f58,ffffffff82fc9e5e,ffff80002a555440,10) at ktrstruct+0x18b sys/kern/kern_ktrace.c:308 sys_nanosleep(ffff80002a4d0f58,ffff80002a555580,ffff80002a5554d0) at sys_nanosleep+0x109 sys/kern/kern_time.c:292 syscall(ffff80002a555580) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6f9b7715d860, count: -7 ddb> show registers rdi 0xfffffd8071349b00 rsi 0x1 rbp 0xffff80002a5551c0 rbx 0x5c rdx 0 rcx 0x1 rax 0 r8 0xffff80002a555320 r9 0x8080808080808080 r10 0xa2f3bf611daece8b r11 0x33208a955da328c1 r12 0x4000 __ALIGN_SIZE+0x3000 r13 0xffff80002a555280 r14 0xffff80002a5551d0 r15 0x1 rip 0xffffffff82ac456e fifo_write+0x6e cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a555190 ss 0x10 fifo_write+0x6e: movq 0x8(%rax),%r15 ddb> show proc PROC (syz-executor) tid=25003 pid=78700 tcnt=1 stat=onproc flags process=2 proc=1 runpri=17, usrpri=84, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a4d0a48,0xffff80002a4d0ce0 process=0xffff80002a465128 user=0xffff80002a550000, vmspace=0xfffffd806c003580 estcpu=34, cpticks=1, pctcpu=0.0, user=0, sys=6, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 32149 127253 78700 0 2 0 syz-executor 76896 463613 16501 0 2 0 syz-executor 76896 352583 16501 0 3 0x4000080 fsleep syz-executor 76896 426475 16501 0 3 0x4000080 fsleep syz-executor 40757 62256 89699 0 3 0x80 nanoslp syz-executor 40757 250616 89699 0 3 0x4000080 fsleep syz-executor 40757 74148 89699 0 3 0x4000080 fsleep syz-executor 46124 48978 75823 0 2 0x2 syz-executor *78700 25003 75823 0 7 0x3 syz-executor 56521 403836 75823 0 2 0x2 syz-executor 1598 117790 75823 0 2 0x2 syz-executor 16501 19178 75823 0 3 0x82 nanoslp syz-executor 16024 174829 75823 0 2 0x2 syz-executor 89699 61728 75823 0 3 0x82 nanoslp syz-executor 43707 448871 75823 0 3 0x82 wait syz-executor 26642 85344 1 0 3 0x100083 ttyin getty 34957 386751 0 0 3 0x14200 bored sosplice 77821 284131 0 0 3 0x14280 nfsidl nfsio 5252 328985 0 0 3 0x14280 nfsidl nfsio 51172 177683 0 0 3 0x14280 nfsidl nfsio 43403 403670 0 0 3 0x14280 nfsidl nfsio 44127 4485 0 0 3 0x14280 nfsidl nfsio 52966 297686 0 0 3 0x14280 nfsidl nfsio 66345 26473 0 0 3 0x14280 nfsidl nfsio 94835 421903 0 0 3 0x14280 nfsidl nfsio 52698 325969 0 0 3 0x14280 nfsidl nfsio 96287 24292 0 0 3 0x14280 nfsidl nfsio 4071 409968 0 0 3 0x14280 nfsidl nfsio 86214 367023 0 0 3 0x14280 nfsidl nfsio 17099 164296 0 0 3 0x14280 nfsidl nfsio 11104 57464 0 0 3 0x14280 nfsidl nfsio 73239 334787 0 0 3 0x14280 nfsidl nfsio 75481 444751 0 0 3 0x14280 nfsidl nfsio 49381 394246 0 0 3 0x14280 nfsidl nfsio 55320 166382 0 0 3 0x14280 nfsidl nfsio 88878 350191 0 0 3 0x14280 nfsidl nfsio 73974 157071 0 0 3 0x14280 nfsidl nfsio 75823 135981 15296 0 3 0x82 kqread syz-executor 15296 11450 25470 0 3 0x10008a sigsusp ksh 25470 472701 19387 0 3 0x98 kqread sshd-session 19387 330697 1 0 3 0x92 kqread sshd-session 96746 394895 24767 73 2 0x1100010 syslogd 24767 388583 1 0 3 0x100082 sbwait syslogd 76372 516083 1 0 3 0x100080 kqread resolvd 14212 365994 86072 77 3 0x100092 kqread dhcpleased 62718 57006 86072 77 3 0x100092 kqread dhcpleased 86072 405987 1 0 3 0x80 kqread dhcpleased 84420 221444 0 0 3 0x14200 bored smr 80434 58711 0 0 2 0x14200 zerothread 23632 233949 0 0 3 0x14200 aiodoned aiodoned 68463 275551 0 0 3 0x14200 syncer update 67629 4055 0 0 3 0x14200 cleaner cleaner 13885 49723 0 0 3 0x14200 reaper reaper 60617 474122 0 0 3 0x14200 pgdaemon pagedaemon 13379 476757 0 0 3 0x14200 bored viomb 85067 17962 0 0 3 0x40014200 acpi0 acpi0 43470 332878 0 0 3 0x14200 bored softnet3 41931 392684 0 0 3 0x14200 bored softnet2 53293 378271 0 0 3 0x14200 bored softnet1 61361 412495 0 0 3 0x14200 bored softnet0 8329 353527 0 0 3 0x14200 bored systqmp 61152 88332 0 0 3 0x14200 bored systq 12340 323154 0 0 3 0x40014200 tmoslp softclock 86025 173676 0 0 3 0x40014200 idle0 1 329569 0 0 3 0x82 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 10190 10152K 10731K 166960K 13163 0 pcb 17 12K 12K 166960K 160 0 rtable 215 6K 7K 166960K 3165 0 pf 32 13K 20K 166960K 299 0 ifaddr 42 9K 9K 166960K 448 0 ifgroup 54 2K 2K 166960K 508 0 sysctl 4 1K 1K 166960K 7 0 counters 31 17K 17K 166960K 156 0 ioctlops 0 0K 4K 166960K 199 0 iov 0 0K 18K 166960K 63 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1372 86K 86K 166960K 3331 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 68K 76K 166960K 21 0 VM map 2 1K 1K 166960K 2 0 sem 18 16K 16K 166960K 21 0 dirhash 18 3K 3K 166960K 27 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 14 49K 93K 166960K 4179 0 sigio 0 0K 0K 166960K 25 0 proc 58 59K 116K 166960K 3100 0 subproc 104 6K 7K 166960K 1261 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 166 0 in_multi 98 7K 7K 166960K 1124 0 ether_multi 1 0K 0K 166960K 5 0 mrt 1 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 1627 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 184 71K 95K 166960K 32153 0 UVM aobj 24 2K 4K 166960K 28 0 pinsyscall 33 66K 98K 166960K 7529 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 55 0 NDP 12 0K 2K 166960K 333 0 temp 67 6813K 6941K 166960K 87131 0 kqueue 12 18K 24K 166960K 206 0 SYN cache 2 8K 16K 166960K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 302 0 298 1 0 1 1 0 8 0 rtentry 112 1128 0 1030 4 0 4 4 0 8 1 unpcb 144 771 0 756 2 0 2 2 0 8 1 syncache 336 9 0 9 2 1 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 808 309 0 307 4 0 4 4 0 8 3 arp 88 204 0 186 1 0 1 1 0 8 0 ipq 40 9 0 8 1 0 1 1 0 8 0 ipqe 40 60 0 58 1 0 1 1 0 8 0 inpcb 336 1461 0 1455 13 4 9 12 0 8 7 nd6 104 302 0 278 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 2 0 1 0 8 0 kcovpl 48 97 0 89 1 0 1 1 0 8 0 ppxss 1072 27 0 27 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 4472 0 4029 35 6 29 29 0 8 1 art_table 32 4474 0 4029 4 0 4 4 0 8 0 art_node 16 1124 0 1036 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 12 1 0 1 1 0 8 0 semupl 112 3 0 3 2 1 1 1 0 8 1 semapl 112 16 0 0 1 0 1 1 0 8 0 shmpl 112 25 0 4 1 0 1 1 0 8 0 dirhash 1024 27 0 6 3 0 3 3 0 8 0 dino2pl 256 5347 0 3687 105 0 105 105 0 8 0 ffsino 240 5347 0 3687 98 0 98 98 0 8 0 nchpl 144 8649 0 6863 67 0 67 67 0 8 0 uvmvnodes 80 7085 0 0 145 0 145 145 0 8 0 vnodes 216 7085 0 0 394 0 394 394 0 8 0 namei 1024 30260 0 30259 3 2 1 2 0 8 0 kstatmem 264 274 0 250 2 0 2 2 0 8 0 scsiplug 72 4 0 4 1 0 1 1 0 8 1 scxspl 216 59645 0 59645 10 2 8 8 1 8 8 plimitpl 152 263 0 247 1 0 1 1 0 8 0 sigapl 424 4305 0 4243 9 0 9 9 0 8 1 futexpl 64 14563 0 14559 1 0 1 1 0 8 0 knotepl 120 97918 0 97873 10 0 10 10 0 8 8 kqueuepl 184 261 0 253 1 0 1 1 0 8 0 pipepl 288 420 0 393 5 2 3 3 0 8 1 fdescpl 432 4268 0 4243 5 1 4 5 0 8 0 filepl 120 11484 0 11246 12 0 12 12 0 8 4 lockfpl 104 312 0 310 1 0 1 1 0 8 0 lockfspl 48 139 0 137 1 0 1 1 0 8 0 sessionpl 144 113 0 106 1 0 1 1 0 8 0 pgrppl 48 213 0 198 1 0 1 1 0 8 0 ucredpl 104 1177 0 1166 1 0 1 1 0 8 0 zombiepl 144 4244 0 4243 3 2 1 1 0 8 0 processpl 1096 4305 0 4243 6 0 6 6 0 8 0 procpl 648 7291 0 7225 8 1 7 7 0 8 0 sosppl 168 5 0 5 1 0 1 1 0 8 1 sockpl 504 2543 0 2518 21 9 12 20 0 8 7 mcl64k 65536 315 0 315 2 1 1 1 0 8 1 mcl16k 16384 237 0 237 4 3 1 1 0 8 1 mcl12k 12288 245 0 245 4 3 1 1 0 8 1 mcl9k 9216 102 0 102 4 3 1 1 0 8 1 mcl8k 8192 865 0 865 5 4 1 2 0 8 1 mcl4k 4096 91 0 91 4 3 1 1 0 8 1 mcl2k2 2112 4 0 4 2 1 1 1 0 8 1 mcl2k 2048 12577 0 12478 36 18 18 30 0 8 4 mtagpl 96 31 0 31 3 2 1 1 0 8 1 mbufpl 256 45916 0 45709 163 140 23 64 0 8 8 bufpl 280 13317 0 4449 634 0 634 634 0 8 0 anonpl 24 504047 0 497312 108 14 94 94 0 187 50 amapchunkpl 152 103546 0 103176 55 17 38 38 0 158 19 amappl16 200 7987 0 7732 79 56 23 39 0 8 8 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 288 0 279 1 0 1 1 0 8 0 amappl13 176 6 0 6 2 1 1 1 0 8 1 amappl12 168 6299 0 6275 3 1 2 3 0 8 0 amappl11 160 48 0 38 1 0 1 1 0 8 0 amappl10 152 22 0 20 1 0 1 1 0 8 0 amappl9 144 131 0 131 1 1 0 1 0 8 0 amappl8 136 21 0 20 1 0 1 1 0 8 0 amappl7 128 274 0 264 1 0 1 1 0 8 0 amappl6 120 1047 0 1046 1 0 1 1 0 8 0 amappl5 112 484 0 475 1 0 1 1 0 8 0 amappl4 104 568 0 556 1 0 1 1 0 8 0 amappl3 96 18782 0 18711 6 3 3 3 0 8 0 amappl2 88 4665 0 4600 2 0 2 2 0 8 0 amappl1 80 25103 0 24666 15 2 13 14 0 8 2 amappl 88 31121 0 30988 5 0 5 5 0 92 1 dma32768 32768 1 0 1 1 0 1 1 0 8 1 dma16384 16384 1 0 1 1 0 1 1 0 8 1 dma8192 8192 1 0 1 1 0 1 1 0 8 1 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma512 512 1 0 1 1 0 1 1 0 8 1 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 256 0 256 2 1 1 1 0 8 1 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 2 1 1 1 0 8 1 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 27 0 4 1 0 1 1 0 8 0 uaddrrnd 24 4268 0 4243 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4268 0 4243 1 0 1 1 0 8 0 vmmpekpl 168 26873 0 26812 3 0 3 3 0 8 0 vmmpepl 168 247779 0 246101 127 18 109 109 0 357 26 vmsppl 344 4267 0 4243 5 1 4 4 0 8 1 rwobjpl 24 67911 0 59851 50 0 50 50 0 8 0 pdppl 4096 8542 0 8486 268 206 62 80 0 8 6 pvpl 32 1883146 0 1874017 385 30 355 363 0 265 242 pmappl 216 4267 0 4243 3 1 2 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 780 0 401 12 0 12 12 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace fifo_write(ffff80002a5551d0) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8071349b00,ffff80002a555280,3,fffffd807f7d78f0) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a4d0f58,fffffd8071349b00,fffffd807f7d78f0,ffff80002a555348,ffff80002a555320) at ktrwriteraw+0x191 sys/kern/kern_ktrace.c:682 ktrstruct(ffff80002a4d0f58,ffffffff82fc9e5e,ffff80002a555440,10) at ktrstruct+0x18b sys/kern/kern_ktrace.c:308 sys_nanosleep(ffff80002a4d0f58,ffff80002a555580,ffff80002a5554d0) at sys_nanosleep+0x109 sys/kern/kern_time.c:292 syscall(ffff80002a555580) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6f9b7715d860, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace fifo_write(ffff80002a5551d0) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8071349b00,ffff80002a555280,3,fffffd807f7d78f0) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a4d0f58,fffffd8071349b00,fffffd807f7d78f0,ffff80002a555348,ffff80002a555320) at ktrwriteraw+0x191 sys/kern/kern_ktrace.c:682 ktrstruct(ffff80002a4d0f58,ffffffff82fc9e5e,ffff80002a555440,10) at ktrstruct+0x18b sys/kern/kern_ktrace.c:308 sys_nanosleep(ffff80002a4d0f58,ffff80002a555580,ffff80002a5554d0) at sys_nanosleep+0x109 sys/kern/kern_time.c:292 syscall(ffff80002a555580) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6f9b7715d860, count: -7