uvm_fault(0xfffffd807e48b008, 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 * 95866 78134 0 0x2 0x1 0 syz-executor fifo_write(ffff80002a57ab70) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd807106de60,ffff80002a57ac20,3,fffffd807f7d77b8) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a4b11c8,fffffd807106de60,fffffd807f7d77b8,ffff80002a57ad80,ffff80002a57ad60) at ktrwriteraw+0x191 sys/kern/kern_ktrace.c:682 ktrpsig(ffff80002a4b11c8,14,4464a1a9540,0,0,ffff80002a57ae50) at ktrpsig+0x1b2 sys/kern/kern_ktrace.c:292 postsig(ffff80002a4b11c8,14,ffff80002a57af58) at postsig+0x3b2 sys/kern/kern_sig.c:1539 userret(ffff80002a4b11c8) at userret+0x1ee sys/kern/kern_sig.c:1990 syscall(ffff80002a57b090) at syscall+0xa72 mi_syscall_return sys/sys/syscall_mi.h:206 [inline] syscall(ffff80002a57b090) at syscall+0xa72 sys/arch/amd64/amd64/trap.c:598 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x740315cd9d30, 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(0xfffffd807e48b008, 0x8, 0, 1) -> e ddb> trace fifo_write(ffff80002a57ab70) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd807106de60,ffff80002a57ac20,3,fffffd807f7d77b8) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a4b11c8,fffffd807106de60,fffffd807f7d77b8,ffff80002a57ad80,ffff80002a57ad60) at ktrwriteraw+0x191 sys/kern/kern_ktrace.c:682 ktrpsig(ffff80002a4b11c8,14,4464a1a9540,0,0,ffff80002a57ae50) at ktrpsig+0x1b2 sys/kern/kern_ktrace.c:292 postsig(ffff80002a4b11c8,14,ffff80002a57af58) at postsig+0x3b2 sys/kern/kern_sig.c:1539 userret(ffff80002a4b11c8) at userret+0x1ee sys/kern/kern_sig.c:1990 syscall(ffff80002a57b090) at syscall+0xa72 mi_syscall_return sys/sys/syscall_mi.h:206 [inline] syscall(ffff80002a57b090) at syscall+0xa72 sys/arch/amd64/amd64/trap.c:598 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x740315cd9d30, count: -8 ddb> show registers rdi 0xfffffd807106de60 rsi 0x1 rbp 0xffff80002a57ab60 rbx 0xe0 rdx 0 rcx 0x1 rax 0 r8 0xffff80002a57ad60 r9 0xffff80002a57ae50 r10 0x7207806a61e416db r11 0x7630e50d0cf0b202 r12 0x4000 __ALIGN_SIZE+0x3000 r13 0xffff80002a57ac20 r14 0xffff80002a57ab70 r15 0x1 rip 0xffffffff827740de fifo_write+0x6e cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a57ab30 ss 0 fifo_write+0x6e: movq 0x8(%rax),%r15 ddb> show proc PROC (syz-executor) tid=95866 pid=78134 tcnt=1 stat=onproc flags process=2 proc=1 runpri=32, usrpri=51, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a4b0a30,0xffff80002a4b0530 process=0xffff8000ffffb370 user=0xffff80002a576000, vmspace=0xfffffd807e48b008 estcpu=1, cpticks=1, pctcpu=0.0, user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 91406 387663 94183 0 2 0 syz-executor 29555 476587 36369 0 2 0 syz-executor 29555 368580 36369 0 3 0x4000080 fsleep syz-executor 18748 274331 68844 0 2 0 syz-executor 18748 213982 68844 0 2 0x4000000 syz-executor 84111 478288 52128 0 3 0x90 fsleep syz-executor 84111 115551 52128 0 3 0x4000090 ttyretype syz-executor 93888 515233 49777 0 3 0x80 fsleep syz-executor 93888 444026 49777 0 3 0x4000080 ttyout syz-executor 16256 491008 83131 0 3 0x80 fsleep syz-executor 16256 193382 83131 0 3 0x4000080 ttyout syz-executor 93831 78197 0 0 3 0x14200 bored sosplice 52128 24143 43997 0 3 0x82 nanoslp syz-executor 11214 279100 43997 0 2 0x2 syz-executor 94183 231489 43997 0 3 0x82 nanoslp syz-executor *78134 95866 43997 0 7 0x3 syz-executor 49777 477332 43997 0 3 0x82 nanoslp syz-executor 68844 503689 43997 0 2 0x2 syz-executor 83131 497177 43997 0 3 0x82 nanoslp syz-executor 36369 230139 43997 0 3 0x82 nanoslp syz-executor 43997 129908 94645 0 3 0x82 kqread syz-executor 94645 345703 97527 0 3 0x10008a sigsusp ksh 97527 319821 92753 0 3 0x98 kqread sshd-session 92753 377516 86236 0 3 0x92 kqread sshd-session 36500 61944 1 0 3 0x100083 ttyin getty 86236 317236 1 0 3 0x88 kqread sshd 32992 481530 9620 73 3 0x1100090 kqread syslogd 9620 293232 1 0 3 0x100082 sbwait syslogd 63726 506840 1 0 3 0x100080 kqread resolvd 27736 411542 22805 77 3 0x100092 kqread dhcpleased 95524 73470 22805 77 3 0x100092 kqread dhcpleased 22805 215066 1 0 3 0x80 kqread dhcpleased 78854 471742 0 0 3 0x14200 bored smr 68450 423803 0 0 2 0x14200 zerothread 6029 473376 0 0 3 0x14200 aiodoned aiodoned 75531 153812 0 0 3 0x14200 syncer update 8452 280879 0 0 3 0x14200 cleaner cleaner 50177 521782 0 0 3 0x14200 reaper reaper 12032 363366 0 0 3 0x14200 pgdaemon pagedaemon 76441 47966 0 0 3 0x14200 bored viomb 95219 472469 0 0 3 0x40014200 acpi0 acpi0 97691 183406 0 0 3 0x14200 bored softnet3 26944 425148 0 0 3 0x14200 bored softnet2 35533 113077 0 0 3 0x14200 bored softnet1 46435 108137 0 0 2 0x14200 softnet0 92667 290248 0 0 3 0x14200 bored systqmp 96521 322029 0 0 3 0x14200 bored systq 39536 37234 0 0 3 0x40014200 tmoslp softclock 81363 62346 0 0 3 0x40014200 idle0 1 477727 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 10184 10029K 10294K 166960K 11383 0 pcb 18 12K 12K 166960K 53 0 rtable 220 7K 8K 166960K 378 0 pf 34 13K 13K 166960K 41 0 ifaddr 41 6K 7K 166960K 48 0 ifgroup 58 2K 2K 166960K 62 0 counters 32 17K 17K 166960K 34 0 ioctlops 0 0K 4K 166960K 103 0 iov 0 0K 16K 166960K 69 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1365 86K 86K 166960K 1528 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 7 0K 0K 166960K 7 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 16 57K 89K 166960K 273 0 sigio 0 0K 0K 166960K 3 0 proc 58 59K 91K 166960K 496 0 subproc 104 6K 6K 166960K 104 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 23 0 in_multi 88 6K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 416 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 198 71K 76K 166960K 3921 0 UVM aobj 11 2K 4K 166960K 13 0 pinsyscall 37 74K 96K 166960K 1276 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 7 0 NDP 13 0K 2K 166960K 31 0 temp 37 6802K 6882K 166960K 5585 0 kqueue 13 20K 28K 166960K 48 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 82 0 79 2 0 2 2 0 8 1 rtentry 112 113 0 13 4 0 4 4 0 8 0 unpcb 144 139 0 122 2 0 2 2 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 808 125 0 120 8 0 8 8 0 8 7 arp 88 18 0 2 1 0 1 1 0 8 0 ipq 40 3 0 0 1 0 1 1 0 8 0 ipqe 40 3 0 0 1 0 1 1 0 8 0 inpcb 336 272 0 262 7 0 7 7 0 8 5 nd6 104 26 0 4 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 2 0 2 1 0 1 1 0 8 1 pfrule 1344 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 457 0 46 29 0 29 29 0 8 2 art_table 32 458 0 46 4 0 4 4 0 8 0 art_node 16 112 0 21 1 0 1 1 0 8 0 semapl 112 5 0 0 1 0 1 1 0 8 0 shmpl 112 10 0 2 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1837 0 341 95 0 95 95 0 8 0 ffsino 240 1837 0 341 89 0 89 89 0 8 0 nchpl 144 2215 0 544 63 0 63 63 0 8 0 uvmvnodes 80 2000 0 0 41 0 41 41 0 8 0 vnodes 216 2000 0 0 112 0 112 112 0 8 0 namei 1024 7067 0 7066 2 0 2 2 0 8 1 kstatmem 264 30 0 4 2 0 2 2 0 8 0 scxspl 216 6209 0 6209 3 0 3 3 1 8 3 plimitpl 152 50 0 32 1 0 1 1 0 8 0 sigapl 424 548 0 502 6 0 6 6 0 8 0 futexpl 64 2270 0 2266 1 0 1 1 0 8 0 knotepl 120 7151 0 7103 9 0 9 9 0 8 7 kqueuepl 184 64 0 55 1 0 1 1 0 8 0 pipepl 288 179 0 152 3 0 3 3 0 8 1 fdescpl 432 531 0 503 5 0 5 5 0 8 1 filepl 120 2752 0 2502 11 0 11 11 0 8 2 lockfpl 104 43 0 41 1 0 1 1 0 8 0 lockfspl 48 21 0 19 1 0 1 1 0 8 0 sessionpl 144 21 0 13 1 0 1 1 0 8 0 pgrppl 48 64 0 48 1 0 1 1 0 8 0 ucredpl 104 393 0 381 1 0 1 1 0 8 0 zombiepl 144 503 0 502 1 0 1 1 0 8 0 processpl 1096 548 0 502 4 0 4 4 0 8 0 procpl 648 763 0 712 6 0 6 6 0 8 0 sosppl 168 1 0 1 1 0 1 1 0 8 1 sockpl 504 494 0 464 15 3 12 15 0 8 7 mcl64k 65536 4 0 4 1 0 1 1 0 8 1 mcl8k 8192 10 0 10 1 0 1 1 0 8 1 mcl4k 4096 3 0 3 1 0 1 1 0 8 1 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 5170 0 5071 27 6 21 27 0 8 7 mtagpl 96 8 0 4 1 0 1 1 0 8 0 mbufpl 256 7747 0 7543 18 0 18 18 0 8 2 bufpl 280 2582 0 90 178 0 178 178 0 8 0 anonpl 24 152517 0 149421 33 0 33 33 0 187 11 amapchunkpl 152 12950 0 12547 25 0 25 25 0 158 6 amappl16 200 3871 0 3850 5 0 5 5 0 8 3 amappl15 192 13 0 12 1 0 1 1 0 8 0 amappl14 184 110 0 100 1 0 1 1 0 8 0 amappl13 176 11 0 11 1 0 1 1 0 8 1 amappl12 168 1137 0 1108 2 0 2 2 0 8 0 amappl11 160 49 0 39 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 0 1 1 0 8 1 amappl9 144 135 0 135 1 0 1 1 0 8 1 amappl8 136 53 0 51 1 0 1 1 0 8 0 amappl7 128 93 0 83 1 0 1 1 0 8 0 amappl6 120 160 0 159 1 0 1 1 0 8 0 amappl5 112 130 0 122 1 0 1 1 0 8 0 amappl4 104 313 0 297 1 0 1 1 0 8 0 amappl3 96 2563 0 2468 4 0 4 4 0 8 0 amappl2 88 582 0 525 2 0 2 2 0 8 0 amappl1 80 7831 0 7301 13 0 13 13 0 8 2 amappl 88 3581 0 3436 5 0 5 5 0 92 0 dma4096 4096 2 0 2 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 0 1 1 0 8 1 dma128 128 254 0 254 1 0 1 1 0 8 1 dma64 64 6 0 6 1 0 1 1 0 8 1 dma32 32 7 0 7 1 0 1 1 0 8 1 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 12 0 2 1 0 1 1 0 8 0 uaddrrnd 24 531 0 503 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 531 0 503 1 0 1 1 0 8 0 vmmpekpl 168 6141 0 6104 2 0 2 2 0 8 0 vmmpepl 168 40941 0 39272 80 0 80 80 0 357 1 vmsppl 344 530 0 503 4 0 4 4 0 8 1 rwobjpl 24 17526 0 14697 18 0 18 18 0 8 0 pdppl 4096 1069 0 1006 95 28 67 79 0 8 4 pvpl 32 298111 0 289286 89 0 89 89 0 265 11 pmappl 216 530 0 503 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 399 0 37 11 0 11 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace fifo_write(ffff80002a57ab70) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd807106de60,ffff80002a57ac20,3,fffffd807f7d77b8) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a4b11c8,fffffd807106de60,fffffd807f7d77b8,ffff80002a57ad80,ffff80002a57ad60) at ktrwriteraw+0x191 sys/kern/kern_ktrace.c:682 ktrpsig(ffff80002a4b11c8,14,4464a1a9540,0,0,ffff80002a57ae50) at ktrpsig+0x1b2 sys/kern/kern_ktrace.c:292 postsig(ffff80002a4b11c8,14,ffff80002a57af58) at postsig+0x3b2 sys/kern/kern_sig.c:1539 userret(ffff80002a4b11c8) at userret+0x1ee sys/kern/kern_sig.c:1990 syscall(ffff80002a57b090) at syscall+0xa72 mi_syscall_return sys/sys/syscall_mi.h:206 [inline] syscall(ffff80002a57b090) at syscall+0xa72 sys/arch/amd64/amd64/trap.c:598 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x740315cd9d30, count: -8 ddb> machine ddbcpu 1 No such command ddb> trace fifo_write(ffff80002a57ab70) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd807106de60,ffff80002a57ac20,3,fffffd807f7d77b8) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a4b11c8,fffffd807106de60,fffffd807f7d77b8,ffff80002a57ad80,ffff80002a57ad60) at ktrwriteraw+0x191 sys/kern/kern_ktrace.c:682 ktrpsig(ffff80002a4b11c8,14,4464a1a9540,0,0,ffff80002a57ae50) at ktrpsig+0x1b2 sys/kern/kern_ktrace.c:292 postsig(ffff80002a4b11c8,14,ffff80002a57af58) at postsig+0x3b2 sys/kern/kern_sig.c:1539 userret(ffff80002a4b11c8) at userret+0x1ee sys/kern/kern_sig.c:1990 syscall(ffff80002a57b090) at syscall+0xa72 mi_syscall_return sys/sys/syscall_mi.h:206 [inline] syscall(ffff80002a57b090) at syscall+0xa72 sys/arch/amd64/amd64/trap.c:598 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x740315cd9d30, count: -8