uvm_fault(0xffffffff83997a28, 0xffff8000299b2160, 0, 1) -> d kernel: page fault trap, code=0 Stopped at ffs2_balloc+0xa0a: movq 0(%rcx,%rax,8),%r14 TID PID UID PRFLAGS PFLAGS CPU COMMAND *186934 28158 0 0x2 0x1 0 syz-executor ffs2_balloc(fffffd806da43600,e39f4,50,fffffd8007ffd820,1,ffff80003c92da18) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80003c92daa0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd805e9de2c8,ffff80003c92db50,3,fffffd8007ffd820) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002f0c02b0,fffffd805e9de2c8,fffffd8007ffd820,ffff80003c92dc20,ffff80003c92dc00) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:691 ktrsysret(ffff80002f0c02b0,5b,0,ffff80003c92dce0) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002f0c02b0,5b,0,ffff80003c92dce0) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209 syscall(ffff80003c92dd90) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80003c92dd90) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x769b46f3b130, 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(0xffffffff83997a28, 0xffff8000299b2160, 0, 1) -> d ddb> trace ffs2_balloc(fffffd806da43600,e39f4,50,fffffd8007ffd820,1,ffff80003c92da18) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80003c92daa0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd805e9de2c8,ffff80003c92db50,3,fffffd8007ffd820) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002f0c02b0,fffffd805e9de2c8,fffffd8007ffd820,ffff80003c92dc20,ffff80003c92dc00) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:691 ktrsysret(ffff80002f0c02b0,5b,0,ffff80003c92dce0) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002f0c02b0,5b,0,ffff80003c92dce0) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209 syscall(ffff80003c92dd90) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80003c92dd90) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x769b46f3b130, count: -7 ddb> show registers rdi 0 rsi 0 rbp 0xffff80003c92d9c0 rbx 0xfffffd806da43600 rdx 0 rcx 0xffff8000299b2000 rax 0x2c r8 0xffffffffffffffff r9 0xffff80003c92da18 r10 0x731861dff4c26eb0 r11 0x336ff224b4b93ded r12 0x1 r13 0xffff800000c47800 r14 0xffff80003c92d860 r15 0xfffffd806cca9d40 rip 0xffffffff827227da ffs2_balloc+0xa0a cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c92d850 ss 0x10 ffs2_balloc+0xa0a: movq 0(%rcx,%rax,8),%r14 ddb> show proc PROC (syz-executor) tid=186934 pid=28158 tcnt=1 stat=onproc flags process=2 proc=1 runpri=32, usrpri=68, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a7f8560,0xffff80002a7f9cc8 process=0xffff80003c9216a0 user=0xffff80003c928000, vmspace=0xfffffd806cce02f8 estcpu=18, cpticks=5, pctcpu=0.1, user=2, sys=3, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 80747 234819 96543 0 2 0 syz-executor 80747 249850 96543 0 3 0x4000000 smrbar syz-executor 80747 350201 96543 0 2 0x4000000 syz-executor 34979 369050 49970 0 2 0 syz-executor 34979 389603 49970 0 3 0x4000080 fsleep syz-executor 34979 416793 49970 0 3 0x4000080 fsleep syz-executor 91789 384326 37673 0 2 0 syz-executor 91789 33144 37673 0 3 0x4000080 fsleep syz-executor 23411 168415 20931 0 3 0x80 nanoslp syz-executor 23411 159674 20931 0 3 0x4000080 kqread syz-executor 23411 317897 20931 0 3 0x4000080 fsleep syz-executor 94141 290092 36484 0 2 0 syz-executor 94141 410366 36484 0 3 0x4000080 fsleep syz-executor 31503 425232 30910 0 2 0 syz-executor 31503 399017 30910 0 3 0x4000080 fsleep syz-executor 49970 193313 53135 0 2 0xc82 syz-executor *28158 186934 53135 0 7 0x3 syz-executor 95532 78461 0 0 3 0x14200 acct acct 64653 170912 1 0 3 0x100083 ttyin getty 57376 404446 0 0 3 0x14280 nfsidl nfsio 96779 90527 0 0 3 0x14280 nfsidl nfsio 55696 153734 0 0 3 0x14280 nfsidl nfsio 58663 306856 0 0 3 0x14280 nfsidl nfsio 90633 76217 0 0 3 0x14280 nfsidl nfsio 29622 424663 0 0 3 0x14280 nfsidl nfsio 34976 94826 0 0 3 0x14280 nfsidl nfsio 66147 172972 0 0 3 0x14280 nfsidl nfsio 28455 95471 0 0 3 0x14280 nfsidl nfsio 74909 454568 0 0 3 0x14280 nfsidl nfsio 15635 216369 0 0 3 0x14280 nfsidl nfsio 57616 254511 0 0 3 0x14280 nfsidl nfsio 33562 350090 0 0 3 0x14280 nfsidl nfsio 17840 412577 0 0 3 0x14280 nfsidl nfsio 88481 433686 0 0 3 0x14280 nfsidl nfsio 78664 40234 0 0 3 0x14280 nfsidl nfsio 78944 508951 0 0 3 0x14280 nfsidl nfsio 97971 205411 0 0 3 0x14280 nfsidl nfsio 71948 481505 0 0 3 0x14280 nfsidl nfsio 21126 25544 0 0 3 0x14280 nfsidl nfsio 30910 298316 53135 0 3 0x82 nanoslp syz-executor 20931 234150 53135 0 3 0x82 nanoslp syz-executor 52258 187878 53135 0 2 0xc82 syz-executor 36484 95063 53135 0 3 0x82 nanoslp syz-executor 96543 5369 53135 0 2 0xc82 syz-executor 37673 247582 53135 0 3 0x82 nanoslp syz-executor 53135 436808 1 0 3 0x82 kqread syz-executor 89964 447145 1 73 3 0x1100090 kqread syslogd 7859 510882 0 0 3 0x14200 bored smr 87652 285441 0 0 2 0x14200 zerothread 21604 35891 0 0 3 0x14200 aiodoned aiodoned 6255 145067 0 0 3 0x14200 syncer update 15649 77743 0 0 3 0x14200 cleaner cleaner 65231 331360 0 0 3 0x14200 reaper reaper 93507 415852 0 0 3 0x14200 pgdaemon pagedaemon 71681 140747 0 0 3 0x14200 bored viomb 65840 148707 0 0 3 0x40014200 acpi0 acpi0 32190 314335 0 0 3 0x14200 bored softnet0 1923 318432 0 0 3 0x14200 smrbar systqmp 33210 320649 0 0 3 0x14200 bored systq 19063 519894 0 0 3 0x40014200 tmoslp softclock 49224 295782 0 0 3 0x40014200 idle0 1 339964 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 11083 12207K 13326K 166960K 13769 0 pcb 22 17K 19K 166960K 374 0 rtable 207 8K 9K 166960K 595 0 pf 35 14K 93K 166960K 141 0 ifaddr 38 6K 8K 166960K 80 0 ifgroup 49 2K 2K 166960K 122 0 sysctl 4 1K 9K 166960K 13 0 counters 34 17K 18K 166960K 62 0 ioctlops 0 0K 4K 166960K 328 0 iov 0 0K 12K 166960K 88 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1517 95K 95K 166960K 2560 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 17 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 36 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 81K 166960K 858 0 sigio 0 0K 0K 166960K 8 0 proc 20 25K 83K 166960K 669 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 182 0 in_multi 77 5K 7K 166960K 149 0 ether_multi 2 0K 0K 166960K 9 0 mrt 2 0K 0K 166960K 22 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 265 1182K 1182K 166960K 265 0 exec 0 0K 1K 166960K 527 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 164 89K 164K 166960K 9293 0 UVM aobj 58 5K 5K 166960K 59 0 pinsyscall 22 44K 88K 166960K 2029 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K