uvm_fault(0xffffffff8392e940, 0xffff800029ef6000, 0, 2) -> e kernel: page fault trap, code=2 Stopped at kcov_remote_enter+0x122: movq $0,0(%rcx) TID PID UID PRFLAGS PFLAGS CPU COMMAND *249183 22626 0 0x1000 0x4080000 0 syz-executor kcov_remote_enter(0,ffff80002a7ac490) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838b51c0,ffff80002a7880a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7880a8,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756 softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788 softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87 dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 vinvalbuf(fffffd806c3f6120,2,fffffd8007ffd680,ffff80003c8f8558,0,ffffffffffffffff) at vinvalbuf+0x608 sys/kern/vfs_subr.c:2010 ffs_truncate(fffffd80679f6a00,0,4,fffffd8007ffd680) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1 ffs_write(ffff8000354d5920) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd806c3f6120,ffff8000354d5ad8,7,fffffd8007ffd680) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd806abfdd28,ffff8000354d5ad8,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80003c8f8558,3,ffff8000354d5ad8,0,ffff8000354d5b80) at dofilewritev+0x2bd sys/kern/sys_generic.c:384 sys_write(ffff80003c8f8558,ffff8000354d5c30,ffff8000354d5b80) at sys_write+0xa2 sys/kern/sys_generic.c:300 end trace frame: 0xffff8000354d5c20, count: 0 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(0xffffffff8392e940, 0xffff800029ef6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a7ac490) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838b51c0,ffff80002a7880a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7880a8,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756 softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788 softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87 dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 vinvalbuf(fffffd806c3f6120,2,fffffd8007ffd680,ffff80003c8f8558,0,ffffffffffffffff) at vinvalbuf+0x608 sys/kern/vfs_subr.c:2010 ffs_truncate(fffffd80679f6a00,0,4,fffffd8007ffd680) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1 ffs_write(ffff8000354d5920) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd806c3f6120,ffff8000354d5ad8,7,fffffd8007ffd680) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd806abfdd28,ffff8000354d5ad8,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80003c8f8558,3,ffff8000354d5ad8,0,ffff8000354d5b80) at dofilewritev+0x2bd sys/kern/sys_generic.c:384 sys_write(ffff80003c8f8558,ffff8000354d5c30,ffff8000354d5b80) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff8000354d5c30) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000354d5c30) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x855833e6b80, count: -16 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff8000354d53a0 rbx 0xffff80002a7ac490 rdx 0xffff80003c8f8558 rcx 0xffff800029ef6000 rax 0xfffffd806cd0ef00 r8 0 r9 0xffffffffffffffff r10 0x1097d0b7f62f1968 r11 0x315e7b5652d36427 r12 0xffffffff82d2d030 endtsleep r13 0xffff80002a788010 r14 0xffff80002a7ac490 r15 0 rip 0xffffffff81e37c02 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff8000354d5380 ss 0x10 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=249183 pid=22626 tcnt=4 stat=onproc flags process=1000 proc=4080000 runpri=17, usrpri=80, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c8f8a88 scnt=3 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c8f8a88,0xffff80003c8f94f8 process=0xffff8000380ead18 user=0xffff8000354d0000, vmspace=0xfffffd80754ff180 estcpu=30, cpticks=8, pctcpu=0.7, user=0, sys=7, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 56366 447544 87445 0 2 0 syz-executor 55149 439846 1997 0 2 0 syz-executor 55149 314224 1997 0 3 0x4000080 fsleep syz-executor 52120 316367 88636 0 2 0 syz-executor 52120 396810 88636 0 3 0x4000000 smrbar syz-executor 55717 505076 71339 27 3 0x1100092 kqread sshd-auth 71339 422001 35367 0 3 0x82 kqread sshd-session 27190 498641 25975 0 2 0 syz-executor 27190 507317 25975 0 3 0x4000080 kqsel syz-executor 25360 4542 22100 0 2 0 syz-executor 25360 233763 22100 0 3 0x4000080 fsleep syz-executor 19875 442064 55192 0 2 0 syz-executor 19875 6502 55192 0 2 0x4000000 syz-executor 80140 427393 69264 0 2 0xc80 syz-executor 80140 96686 69264 0 3 0x4000080 netacc syz-executor 80140 513316 69264 0 3 0x4000080 fsleep syz-executor 22626 392353 72111 0 3 0x3000 suspend syz-executor *22626 249183 72111 0 7 0x4081000 syz-executor 22626 189161 72111 0 3 0x4081000 inode syz-executor 22626 363801 72111 0 3 0x4081000 inode syz-executor 2131 502937 1 0 3 0x100083 ttyin getty 88636 339008 59351 0 3 0x82 nanoslp syz-executor 25975 520606 59351 0 2 0xc82 syz-executor 22100 147003 59351 0 3 0x82 nanoslp syz-executor 72111 427801 59351 0 3 0x82 nanoslp syz-executor 87445 358096 59351 0 3 0x82 nanoslp syz-executor 1997 226130 59351 0 2 0xc82 syz-executor 55192 26523 59351 0 3 0x82 nanoslp syz-executor 69264 276323 59351 0 3 0x82 nanoslp syz-executor 59351 358418 2216 0 3 0x82 kqread syz-executor 2216 510246 87864 0 3 0x10008a sigsusp ksh 87864 418291 39175 0 3 0x98 kqread sshd-session 39175 459282 35367 0 3 0x92 kqread sshd-session 35367 482762 1 0 3 0x88 kqread sshd 97577 282826 29704 73 3 0x1100090 kqread syslogd 29704 28512 1 0 3 0x100082 sbwait syslogd 85477 426104 1 0 3 0x100080 kqread resolvd 33913 353034 53727 77 3 0x100092 kqread dhcpleased 78853 312916 53727 77 3 0x100092 kqread dhcpleased 53727 235419 1 0 3 0x80 kqread dhcpleased 38661 183553 0 0 3 0x14200 bored smr 57026 238434 0 0 2 0x14200 zerothread 73496 234571 0 0 3 0x14200 aiodoned aiodoned 26406 483169 0 0 3 0x14200 syncer update 76586 500899 0 0 3 0x14200 cleaner cleaner 12067 209738 0 0 3 0x14200 reaper reaper 24695 237453 0 0 3 0x14200 pgdaemon pagedaemon 85147 303499 0 0 3 0x14200 bored viomb 20833 128179 0 0 3 0x40014200 acpi0 acpi0 48178 296222 0 0 3 0x14200 bored softnet0 62968 329375 0 0 3 0x14200 bored systqmp 37777 55187 0 0 3 0x14200 bored systq 93233 376478 0 0 3 0x40014200 tmoslp softclock 8681 210745 0 0 3 0x40014200 idle0 1 270415 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11062 12103K 13251K 166960K 13256 0 pcb 17 15K 16K 166960K 192 0 rtable 215 7K 8K 166960K 428 0 pf 32 13K 20K 166960K 108 0 ifaddr 37 6K 7K 166960K 65 0 ifgroup 45 1K 2K 166960K 91 0 sysctl 4 1K 9K 166960K 10 0 counters 34 17K 18K 166960K 53 0 ioctlops 0 0K 4K 166960K 220 0 iov 0 0K 12K 166960K 17 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1388 87K 88K 166960K 1934 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 24 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 747 0 sigio 0 0K 0K 166960K 8 0 proc 63 67K 91K 166960K 587 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 60 0 in_multi 80 6K 7K 166960K 136 0 ether_multi 1 0K 0K 166960K 8 0 mrt 1 0K 0K 166960K 21 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 223 996K 996K 166960K 223 0 exec 0 0K 1K 166960K 433 0 fusefs mount 1 32K 32K 166960K 1 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 244 176K 176K 166960K 8380 0 UVM aobj 85 5K 5K 166960K 86 0 pinsyscall 43 86K 94K 166960K 1872 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 34 0 NDP 11 0K 2K 166960K 42 0 temp 60 9071K 9160K 166960K 17737 0 kqueue 17 28K 31K 166960K 152 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 81 0 78 1 0 1 1 0 8 0 rtentry 136 119 0 28 4 0 4 4 0 8 0 unpcb 144 568 0 547 6 0 6 6 0 8 5 syncache 336 7 0 7 1 0 1 1 0 8 1 tcpcb 736 290 0 281 7 0 7 7 0 8 5 arp 96 19 0 2 1 0 1 1 0 8 0 inpcb 328 803 0 789 7 0 7 7 0 8 5 nd6 112 24 0 7 1 0 1 1 0 8 0 pkpcb 40 6 0 6 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 15 0 13 1 0 1 1 0 8 0 pppxif 1416 4 0 4 1 0 1 1 0 8 1 pfstscr 40 3 0 3 1 0 1 1 0 8 1 pffrag 232 6 0 1 1 0 1 1 0 482 0 pffrnode 88 6 0 1 1 0 1 1 0 8 0 pffrent 40 67 0 61 1 0 1 1 0 8 0 pfrktable 1344 2 0 2 1 0 1 1 0 8 1 pfsrclim 320 1 0 1 1 0 1 1 0 8 1 pfanchor 1288 3 0 0 1 0 1 1 0 8 0 pftag 88 4 0 1 1 0 1 1 0 8 0 pfqueue 320 1 0 0 1 0 1 1 0 8 0 pfstkey 128 6 0 6 1 0 1 1 0 8 1 pfstate 384 3 0 3 1 0 1 1 0 8 1 pfrule 1360 13 0 13 1 0 1 1 0 8 1 rttmr 136 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 478 0 94 28 0 28 28 0 8 2 art_table 40 480 0 94 5 0 5 5 0 8 0 art_node 32 119 0 35 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 5 1 0 1 1 0 8 0 semapl 112 20 0 10 1 0 1 1 0 8 0 shmpl 112 83 0 1 3 0 3 3 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 2740 0 1286 92 0 92 92 0 8 0 ffsino 256 2740 0 1286 92 0 92 92 0 8 0 nchpl 144 3826 0 2129 64 0 64 64 0 8 0 rtmask 32 1 0 0 1 0 1 1 0 8 0 vnodes 216 3125 0 0 174 0 174 174 0 8 0 namei 1024 13261 0 13260 2 0 2 2 0 8 1 kstatmem 264 50 0 28 2 0 2 2 0 8 0 scsiplug 72 3 0 3 1 0 1 1 0 8 1 scxspl 216 24031 0 24031 8 0 8 8 1 8 8 plimitpl 152 308 0 289 1 0 1 1 0 8 0 sigapl 424 1050 0 1005 6 0 6 6 0 8 0 knotepl 120 25654 0 25599 16 6 10 16 0 8 8 kqueuepl 184 354 0 339 4 0 4 4 0 8 3 pipepl 304 192 0 164 3 0 3 3 0 8 0 fdescpl 448 1034 0 1002 5 0 5 5 0 8 1 filepl 120 6800 0 6567 12 0 12 12 0 8 3 lockfpl 104 303 0 301 1 0 1 1 0 8 0 lockfspl 48 107 0 105 1 0 1 1 0 8 0 sessionpl 144 53 0 44 1 0 1 1 0 8 0 pgrppl 48 65 0 48 1 0 1 1 0 8 0 ucredpl 104 956 0 944 1 0 1 1 0 8 0 zombiepl 144 1006 0 1005 1 0 1 1 0 8 0 processpl 1152 1050 0 1005 4 0 4 4 0 8 0 procpl 664 1993 0 1938 6 0 6 6 0 8 0 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 552 1482 0 1444 12 1 11 12 0 8 7 mcl64k 65536 97 0 95 1 0 1 1 0 8 0 mcl16k 16384 5 0 5 1 0 1 1 0 8 1 mcl8k 8192 9 0 8 1 0 1 1 0 8 0 mcl4k 4096 3392 0 3341 16 1 15 16 0 8 7 mcl2k 2048 669 0 665 1 0 1 1 0 8 0 mtagpl 96 117 0 10 3 0 3 3 0 8 0 mbufpl 256 10212 0 9917 23 0 23 23 0 8 3 bufpl 280 9426 0 3212 444 0 444 444 0 8 0 anonpl 24 171202 0 164833 72 0 72 72 0 187 21 amapchunkpl 152 28043 0 27546 36 0 36 36 0 158 13 amappl16 200 3264 0 3059 24 7 17 24 0 8 3 amappl15 192 5 0 5 1 0 1 1 0 8 1 amappl14 184 409 0 407 1 0 1 1 0 8 0 amappl13 176 122 0 110 1 0 1 1 0 8 0 amappl12 168 1279 0 1247 2 0 2 2 0 8 0 amappl11 160 7 0 7 1 0 1 1 0 8 1 amappl10 152 58 0 47 1 0 1 1 0 8 0 amappl9 144 263 0 263 1 0 1 1 0 8 1 amappl8 136 98 0 96 1 0 1 1 0 8 0 amappl7 128 154 0 140 1 0 1 1 0 8 0 amappl6 120 151 0 149 1 0 1 1 0 8 0 amappl5 112 94 0 84 1 0 1 1 0 8 0 amappl4 104 275 0 259 1 0 1 1 0 8 0 amappl3 96 5449 0 5331 4 0 4 4 0 8 0 amappl2 88 565 0 496 2 0 2 2 0 8 0 amappl1 80 13059 0 12337 15 0 15 15 0 8 0 amappl 88 7539 0 7371 5 0 5 5 0 92 0 uvmvnodes 80 118 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 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 128 256 0 256 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 85 0 1 2 0 2 2 0 8 0 uaddrrnd 24 1034 0 1002 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1034 0 1002 1 0 1 1 0 8 0 vmmpekpl 168 9869 0 9840 2 0 2 2 0 8 0 vmmpepl 168 73276 0 70994 102 0 102 102 0 357 2 vmsppl 368 1033 0 1002 4 0 4 4 0 8 1 rwobjpl 40 22213 0 20784 16 0 16 16 0 8 0 pdppl 4096 2074 0 2004 98 28 70 80 0 8 0 pvpl 32 468351 0 455289 157 0 157 157 0 265 29 pmappl 216 1033 0 1002 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 381 0 29 11 0 11 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a7ac490) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838b51c0,ffff80002a7880a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7880a8,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756 softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788 softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87 dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 vinvalbuf(fffffd806c3f6120,2,fffffd8007ffd680,ffff80003c8f8558,0,ffffffffffffffff) at vinvalbuf+0x608 sys/kern/vfs_subr.c:2010 ffs_truncate(fffffd80679f6a00,0,4,fffffd8007ffd680) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1 ffs_write(ffff8000354d5920) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd806c3f6120,ffff8000354d5ad8,7,fffffd8007ffd680) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd806abfdd28,ffff8000354d5ad8,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80003c8f8558,3,ffff8000354d5ad8,0,ffff8000354d5b80) at dofilewritev+0x2bd sys/kern/sys_generic.c:384 sys_write(ffff80003c8f8558,ffff8000354d5c30,ffff8000354d5b80) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff8000354d5c30) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000354d5c30) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x855833e6b80, count: -16 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a7ac490) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838b51c0,ffff80002a7880a8) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7880a8,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756 softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788 softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87 dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 vinvalbuf(fffffd806c3f6120,2,fffffd8007ffd680,ffff80003c8f8558,0,ffffffffffffffff) at vinvalbuf+0x608 sys/kern/vfs_subr.c:2010 ffs_truncate(fffffd80679f6a00,0,4,fffffd8007ffd680) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1 ffs_write(ffff8000354d5920) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd806c3f6120,ffff8000354d5ad8,7,fffffd8007ffd680) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd806abfdd28,ffff8000354d5ad8,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80003c8f8558,3,ffff8000354d5ad8,0,ffff8000354d5b80) at dofilewritev+0x2bd sys/kern/sys_generic.c:384 sys_write(ffff80003c8f8558,ffff8000354d5c30,ffff8000354d5b80) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff8000354d5c30) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000354d5c30) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x855833e6b80, count: -16