uvm_fault(0xfffffd806c29e6c8, 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 *343600 79230 0 0 0x4000000 0 syz-executor fifo_write(ffff8000327f2a80) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd806c97f718,ffff8000327f2b18,8,fffffd807f7d7820) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806c97f718,ffff80002a47b400,fc,0,1,3a94ea7083e88793,ffff8000327f2c40,fffffd806c97f718,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff8000327f2c40) at ufs_symlink+0x1e2 sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd806c97fb50,ffff8000327f2dc0,ffff8000327f2df0,ffff8000327f2cf0,ffff80002a47b400) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff80002a5d5978,20000700,6,200004c0) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff8000327f2f70) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc80352eb810, count: 7 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(0xfffffd806c29e6c8, 0x8, 0, 1) -> e ddb> trace fifo_write(ffff8000327f2a80) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd806c97f718,ffff8000327f2b18,8,fffffd807f7d7820) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806c97f718,ffff80002a47b400,fc,0,1,3a94ea7083e88793,ffff8000327f2c40,fffffd806c97f718,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff8000327f2c40) at ufs_symlink+0x1e2 sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd806c97fb50,ffff8000327f2dc0,ffff8000327f2df0,ffff8000327f2cf0,ffff80002a47b400) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff80002a5d5978,20000700,6,200004c0) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff8000327f2f70) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc80352eb810, count: -8 ddb> show registers rdi 0xfffffd806c97f718 rsi 0x76b rbp 0xffff8000327f2a70 rbx 0xfffffd806c97f718 rdx 0xffff8000327f8000 rcx 0x76a rax 0 r8 0 r9 0x1 r10 0xab0ce8dc4d55c8df r11 0xaf9d6f782a438532 r12 0x4000 __ALIGN_SIZE+0x3000 r13 0xffff8000327f2b18 r14 0xffff8000327f2a80 r15 0x1 rip 0xffffffff81ee79fe fifo_write+0x6e cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000327f2a40 ss 0 fifo_write+0x6e: movq 0x8(%rax),%r15 ddb> show proc PROC (syz-executor) tid=343600 pid=79230 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=17, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a4fef68,0xffff80002a5d4f68 process=0xffff80002a5ba6a8 user=0xffff8000327ee000, vmspace=0xfffffd806c29e6c8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 9647 252673 65527 0 2 0 syz-executor 9647 185731 65527 0 3 0x4000080 fsleep syz-executor 79230 33511 71464 0 2 0 syz-executor *79230 343600 71464 0 7 0x4000000 syz-executor 81303 274511 9504 0 2 0 syz-executor 81303 448336 9504 0 2 0x4000000 syz-executor 8815 106342 45726 0 2 0 syz-executor 311 254269 29713 0 2 0 syz-executor 23202 482411 0 0 3 0x14200 acct acct 71464 191185 79199 0 3 0x82 nanoslp syz-executor 89774 179798 79199 0 2 0x2 syz-executor 45726 483591 79199 0 3 0x82 nanoslp syz-executor 9504 162970 79199 0 3 0x82 nanoslp syz-executor 59098 10492 79199 0 2 0x2 syz-executor 57451 342428 79199 0 2 0x2 syz-executor 65527 474515 79199 0 3 0x82 nanoslp syz-executor 54032 433980 0 0 3 0x14280 nfsidl nfsio 85555 153741 0 0 3 0x14280 nfsidl nfsio 65282 404759 0 0 3 0x14280 nfsidl nfsio 22444 2558 0 0 3 0x14280 nfsidl nfsio 61321 279128 0 0 3 0x14280 nfsidl nfsio 30302 105003 0 0 3 0x14280 nfsidl nfsio 12603 23467 0 0 3 0x14280 nfsidl nfsio 5 215233 0 0 3 0x14280 nfsidl nfsio 29781 252747 0 0 3 0x14280 nfsidl nfsio 51565 464838 0 0 3 0x14280 nfsidl nfsio 83840 195949 0 0 3 0x14280 nfsidl nfsio 38528 301140 0 0 3 0x14280 nfsidl nfsio 65303 397252 0 0 3 0x14280 nfsidl nfsio 87616 207616 0 0 3 0x14280 nfsidl nfsio 50732 493625 0 0 3 0x14280 nfsidl nfsio 22025 408938 0 0 3 0x14280 nfsidl nfsio 15639 504002 0 0 3 0x14280 nfsidl nfsio 47222 186761 0 0 3 0x14280 nfsidl nfsio 10821 379910 0 0 3 0x14280 nfsidl nfsio 26216 212240 0 0 3 0x14280 nfsidl nfsio 58514 298020 0 0 3 0x14200 bored sosplice 29713 262454 79199 0 2 0x2 syz-executor 79199 122380 84617 0 2 0x2 syz-executor 84617 469032 88230 0 3 0x10008a sigsusp ksh 88230 170196 35494 0 3 0x98 kqread sshd-session 35494 522558 32738 0 3 0x92 kqread sshd-session 54114 122796 1 0 3 0x100083 ttyin getty 32738 185645 1 0 3 0x88 kqread sshd 15120 135087 57533 73 3 0x1100090 kqread syslogd 57533 279732 1 0 3 0x100082 sbwait syslogd 87316 11595 1 0 3 0x100080 kqread resolvd 97591 343736 27677 77 3 0x100092 kqread dhcpleased 82264 153231 27677 77 3 0x100092 kqread dhcpleased 27677 60764 1 0 3 0x80 kqread dhcpleased 58507 315565 0 0 3 0x14200 bored smr 67090 313914 0 0 2 0x14200 zerothread 30774 219317 0 0 3 0x14200 aiodoned aiodoned 52949 101677 0 0 3 0x14200 syncer update 34319 25503 0 0 3 0x14200 cleaner cleaner 73972 113674 0 0 3 0x14200 reaper reaper 18308 491444 0 0 3 0x14200 pgdaemon pagedaemon 43806 520301 0 0 3 0x14200 bored viomb 18697 373220 0 0 3 0x40014200 acpi0 acpi0 44664 284936 0 0 3 0x14200 bored softnet3 23747 75896 0 0 3 0x14200 bored softnet2 4925 331481 0 0 3 0x14200 bored softnet1 7577 468347 0 0 3 0x14200 bored softnet0 34758 414706 0 0 3 0x14200 bored systqmp 41973 91067 0 0 3 0x14200 bored systq 33263 340456 0 0 3 0x40014200 tmoslp softclock 27327 164814 0 0 3 0x40014200 idle0 1 368035 0 0 3 0x80082 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 10192 10037K 10410K 166960K 12475 0 pcb 17 12K 12K 166960K 528 0 rtable 175 7K 8K 166960K 890 0 pf 32 13K 14K 166960K 146 0 ifaddr 35 5K 7K 166960K 133 0 ifgroup 54 2K 2K 166960K 195 0 sysctl 2 0K 0K 166960K 2 0 counters 31 17K 17K 166960K 74 0 ioctlops 0 0K 4K 166960K 226 0 iov 0 0K 16K 166960K 130 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1392 88K 88K 166960K 2705 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 68K 72K 166960K 47 0 VM map 2 1K 1K 166960K 2 0 sem 21 17K 27K 166960K 29 0 dirhash 12 2K 2K 166960K 78 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 15 53K 97K 166960K 4190 0 sigio 0 0K 0K 166960K 103 0 proc 59 59K 124K 166960K 940 0 subproc 104 6K 8K 166960K 273 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 290 0 in_multi 67 5K 7K 166960K 355 0 ether_multi 1 0K 0K 166960K 40 0 mrt 1 0K 0K 166960K 23 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 725 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 187 71K 99K 166960K 37038 0 UVM aobj 49 2K 2K 166960K 54 0 pinsyscall 36 72K 96K 166960K 5473 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 212 0 NDP 12 0K 2K 166960K 92 0 temp 75 6816K 6944K 166960K 98274 0 kqueue 13 20K 34K 166960K 648 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 144 0 141 1 0 1 1 0 8 0 rtentry 112 303 0 228 4 0 4 4 0 8 1 unpcb 144 1790 0 1775 3 1 2 2 0 8 1 syncache 336 4 0 4 2 1 1 1 0 8 1 tcpcb 808 1074 0 1068 2 0 2 2 0 8 1 arp 88 68 0 52 1 0 1 1 0 8 0 ipq 40 19 0 19 1 0 1 1 0 8 1 ipqe 40 204 0 204 1 0 1 1 0 8 1 inpcb 336 3196 0 3184 4 1 3 3 0 8 1 nd6 104 63 0 43 1 0 1 1 0 8 0 pkpcb 40 11 0 11 2 1 1 1 0 8 1 kcovpl 48 21 0 13 1 0 1 1 0 8 0 ppxss 1072 23 0 23 2 1 1 1 0 8 1 art_heap8 4096 4 0 2 3 1 2 3 0 8 0 art_heap4 256 1102 0 791 31 8 23 29 0 8 1 art_table 32 1106 0 793 4 0 4 4 0 8 1 art_node 16 300 0 235 1 0 1 1 0 8 0 sysvmsgpl 40 19 0 11 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 21 0 2 1 0 1 1 0 8 0 shmpl 112 51 0 5 2 0 2 2 0 8 0 dirhash 1024 62 0 45 3 0 3 3 0 8 0 dino2pl 256 7566 0 6056 95 0 95 95 0 8 0 ffsino 240 7566 0 6056 90 0 90 90 0 8 0 nchpl 144 12577 0 10875 64 0 64 64 0 8 0 uvmvnodes 80 8397 0 0 172 0 172 172 0 8 0 vnodes 216 8397 0 0 467 0 467 467 0 8 0 namei 1024 34798 0 34796 2 1 1 2 0 8 0 kstatmem 264 110 0 86 2 0 2 2 0 8 0 scsiplug 72 4 0 4 2 1 1 1 0 8 1 scxspl 216 88932 0 88932 9 7 2 8 1 8 2 plimitpl 152 584 0 568 1 0 1 1 0 8 0 sigapl 424 4468 0 4403 8 0 8 8 0 8 0 futexpl 64 35973 0 35972 1 0 1 1 0 8 0 knotepl 120 130974 0 130926 24 12 12 17 0 8 7 kqueuepl 184 844 0 834 1 0 1 1 0 8 0 pipepl 288 273 0 246 3 0 3 3 0 8 0 fdescpl 432 4428 0 4401 5 1 4 5 0 8 0 filepl 120 17257 0 17015 11 1 10 10 0 8 1 lockfpl 104 899 0 897 1 0 1 1 0 8 0 lockfspl 48 341 0 339 1 0 1 1 0 8 0 sessionpl 144 31 0 23 1 0 1 1 0 8 0 pgrppl 48 73 0 57 1 0 1 1 0 8 0 ucredpl 104 3990 0 3979 1 0 1 1 0 8 0 zombiepl 144 4403 0 4403 1 0 1 1 0 8 1 processpl 1096 4468 0 4403 6 0 6 6 0 8 1 procpl 648 9004 0 8936 8 0 8 8 0 8 0 sosppl 168 121 0 121 1 0 1 1 0 8 1 sockpl 504 5157 0 5127 9 1 8 8 0 8 3 mcl64k 65536 759 0 759 2 1 1 1 0 8 1 mcl16k 16384 457 0 457 2 1 1 1 0 8 1 mcl12k 12288 312 0 312 2 1 1 1 0 8 1 mcl9k 9216 80 0 80 2 1 1 1 0 8 1 mcl8k 8192 417 0 417 2 1 1 1 0 8 1 mcl4k 4096 290 0 290 2 1 1 1 0 8 1 mcl2k2 2112 8 0 8 2 1 1 1 0 8 1 mcl2k 2048 13567 0 13460 31 15 16 29 0 8 2 mtagpl 96 32 0 23 1 0 1 1 0 8 0 mbufpl 256 52105 0 51894 148 125 23 64 0 8 8 bufpl 280 17833 0 10384 623 28 595 623 0 8 8 anonpl 24 633294 0 630302 144 46 98 98 0 187 53 amapchunkpl 152 128768 0 128407 57 22 35 42 0 158 14 amappl16 200 12157 0 12132 66 50 16 28 0 8 8 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 148 0 138 1 0 1 1 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 5212 0 5186 3 1 2 3 0 8 0 amappl11 160 52 0 42 1 0 1 1 0 8 0 amappl10 152 15 0 15 1 1 0 1 0 8 0 amappl9 144 152 0 152 1 1 0 1 0 8 0 amappl8 136 35 0 34 1 0 1 1 0 8 0 amappl7 128 119 0 108 1 0 1 1 0 8 0 amappl6 120 269 0 268 1 0 1 1 0 8 0 amappl5 112 177 0 169 1 0 1 1 0 8 0 amappl4 104 319 0 305 1 0 1 1 0 8 0 amappl3 96 23009 0 22935 3 0 3 3 0 8 0 amappl2 88 4662 0 4592 2 0 2 2 0 8 0 amappl1 80 20274 0 19744 14 2 12 14 0 8 0 amappl 88 36503 0 36370 5 0 5 5 0 92 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma32768 32768 2 0 2 1 1 0 1 0 8 0 dma16384 16384 4 0 4 1 1 0 1 0 8 0 dma8192 8192 2 0 2 1 1 0 1 0 8 0 dma4096 4096 2 0 2 1 1 0 1 0 8 0 dma2048 2048 3 0 3 2 1 1 1 0 8 1 dma1024 1024 3 0 2 1 0 1 1 0 8 0 dma512 512 2 0 2 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 255 0 255 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 10 0 10 1 1 0 1 0 8 0 dma16 16 20 0 19 1 0 1 1 0 8 0 aobjpl 72 53 0 5 1 0 1 1 0 8 0 uaddrrnd 24 4428 0 4401 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4428 0 4401 1 0 1 1 0 8 0 vmmpekpl 168 24104 0 24044 3 0 3 3 0 8 0 vmmpepl 168 259888 0 258263 110 8 102 102 0 357 20 vmsppl 344 4427 0 4401 4 1 3 4 0 8 0 rwobjpl 24 68142 0 58879 57 0 57 57 0 8 0 pdppl 4096 8862 0 8802 130 64 66 82 0 8 6 pvpl 32 2602860 0 2594017 549 259 290 368 0 265 176 pmappl 216 4427 0 4401 3 0 3 3 0 8 1 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 571 0 229 12 0 12 12 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace fifo_write(ffff8000327f2a80) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd806c97f718,ffff8000327f2b18,8,fffffd807f7d7820) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806c97f718,ffff80002a47b400,fc,0,1,3a94ea7083e88793,ffff8000327f2c40,fffffd806c97f718,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff8000327f2c40) at ufs_symlink+0x1e2 sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd806c97fb50,ffff8000327f2dc0,ffff8000327f2df0,ffff8000327f2cf0,ffff80002a47b400) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff80002a5d5978,20000700,6,200004c0) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff8000327f2f70) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc80352eb810, count: -8 ddb> machine ddbcpu 1 No such command ddb> trace fifo_write(ffff8000327f2a80) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd806c97f718,ffff8000327f2b18,8,fffffd807f7d7820) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806c97f718,ffff80002a47b400,fc,0,1,3a94ea7083e88793,ffff8000327f2c40,fffffd806c97f718,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff8000327f2c40) at ufs_symlink+0x1e2 sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd806c97fb50,ffff8000327f2dc0,ffff8000327f2df0,ffff8000327f2cf0,ffff80002a47b400) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff80002a5d5978,20000700,6,200004c0) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff8000327f2f70) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc80352eb810, count: -8