uvm_fault(0xffff800001c92020, 0x8, 0, 1) -> e kernel: page fault trap, code=0 Stopped at knote_processfork+0x287: movq 0x8(%r15),%r14 TID PID UID PRFLAGS PFLAGS CPU COMMAND 294033 95888 0 0x10 0x4000000 1 syz-executor *144348 43709 0 0 0x4000000 0 syz-executor knote_processfork(ffffffff855596c0,d853) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85559360,f0,ffffffff83dc4990,0,0,ffff80003bc300a0) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff83dc4990,0,ffffffff85e3fc20,ffffffff84d16b00) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 sys_acct(ffff800045ff6550,ffff80003bc30470,ffff80003bc303e0) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline] sys_acct(ffff800045ff6550,ffff80003bc30470,ffff80003bc303e0) at sys_acct+0x35e sys/kern/kern_acct.c:151 syscall(ffff80003bc30470) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bc30470) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b90215d0d0, count: 9 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: uvm_fault(0xffff800001c92020, 0x8, 0, 1) -> e ddb{0}> show kasan kasan: no report recorded this boot ddb{0}> trace knote_processfork(ffffffff855596c0,d853) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85559360,f0,ffffffff83dc4990,0,0,ffff80003bc300a0) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff83dc4990,0,ffffffff85e3fc20,ffffffff84d16b00) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 sys_acct(ffff800045ff6550,ffff80003bc30470,ffff80003bc303e0) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline] sys_acct(ffff800045ff6550,ffff80003bc30470,ffff80003bc303e0) at sys_acct+0x35e sys/kern/kern_acct.c:151 syscall(ffff80003bc30470) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bc30470) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b90215d0d0, count: -6 ddb{0}> show registers rdi 0x8 rsi 0x1 rbp 0xffff80003bc2ff70 rbx 0xffff8000017e782a rdx 0 rcx 0xffffffff85311ff0 cpu_info_full_primary+0x1ff0 rax 0x1 r8 0x8 r9 0x1 r10 0 r11 0xffffffff81eb7160 filt_proc r12 0xffff80003bc2fe20 r13 0xffff80003bc2fe20 r14 0xffffffff85559800 process0+0x140 r15 0 rip 0xffffffff81ec5577 knote_processfork+0x287 cs 0x8 rflags 0x10282 __ALIGN_SIZE+0xf282 rsp 0xffff80003bc2fdc0 ss 0x10 knote_processfork+0x287: movq 0x8(%r15),%r14 ddb{0}> show proc PROC (syz-executor) tid=144348 pid=43709 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=81, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800045ff6fb0,0xffff800029971798 process=0xffff800045ff09c0 user=0xffff80003bc25000, vmspace=0xffff800001c92020 estcpu=31, cpticks=3, pctcpu=0.3, user=0, sys=3, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 55379 81168 0 0 2 0x14000 0x200 swapper 80914 501726 54698 0 2 0 0 syz-executor 80914 183234 54698 0 3 0 0x4000080 fsleep syz-executor 95888 100309 152 0 2 0x10 0 syz-executor 95888 294033 152 0 7 0x10 0x4000000 syz-executor 95888 168455 152 0 3 0x10 0x4000080 fsleep syz-executor 16167 505600 76757 0 2 0 0 syz-executor 16167 106000 76757 0 3 0 0x4000080 fsleep syz-executor 43709 267278 44263 0 2 0 0 syz-executor 43709 16907 44263 0 3 0 0x4000080 fsleep syz-executor *43709 144348 44263 0 7 0 0x4000000 syz-executor 31276 117190 3259 0 3 0 0x80 nanoslp syz-executor 31276 519520 3259 0 3 0 0x4000080 kqsel syz-executor 31276 148206 3259 0 3 0 0x4000080 fsleep syz-executor 23560 220135 0 0 3 0x14000 0x280 nfsidl nfsio 37828 285799 0 0 3 0x14000 0x280 nfsidl nfsio 87617 423743 0 0 3 0x14000 0x280 nfsidl nfsio 64903 464596 0 0 3 0x14000 0x280 nfsidl nfsio 80206 317464 0 0 3 0x14000 0x280 nfsidl nfsio 61788 52826 0 0 3 0x14000 0x280 nfsidl nfsio 29569 232298 0 0 3 0x14000 0x280 nfsidl nfsio 76568 52523 0 0 3 0x14000 0x280 nfsidl nfsio 58088 454491 0 0 3 0x14000 0x280 nfsidl nfsio 2367 293251 0 0 3 0x14000 0x280 nfsidl nfsio 14426 20559 0 0 3 0x14000 0x280 nfsidl nfsio 15113 396551 0 0 3 0x14000 0x280 nfsidl nfsio 24373 266784 0 0 3 0x14000 0x280 nfsidl nfsio 78166 133503 0 0 3 0x14000 0x280 nfsidl nfsio 32145 130896 0 0 3 0x14000 0x280 nfsidl nfsio 57040 176259 0 0 3 0x14000 0x280 nfsidl nfsio 92447 15385 0 0 3 0x14000 0x280 nfsidl nfsio 31719 522841 0 0 3 0x14000 0x280 nfsidl nfsio 33896 462414 0 0 3 0x14000 0x280 nfsidl nfsio 54375 317764 0 0 3 0x14000 0x280 nfsidl nfsio 13017 381619 1 0 3 0x100003 0x80 ttyin getty 44263 343742 52531 0 3 0x2 0x80 nanoslp syz-executor 54698 213371 52531 0 2 0x2 0 syz-executor 3259 38966 52531 0 3 0x2 0x80 nanoslp syz-executor 35036 30651 52531 0 2 0x2 0 syz-executor 152 72671 52531 0 3 0x2 0x80 nanoslp syz-executor 4255 161463 52531 0 3 0x2 0x80 wait syz-executor 87342 518576 52531 0 2 0x2 0 syz-executor 76757 298738 52531 0 3 0x2 0x80 nanoslp syz-executor 52531 522872 1 0 3 0x2 0x80 kqread syz-executor 44397 427972 56263 74 3 0x1100012 0x80 bpf pflogd 56263 259297 1 0 3 0 0x80 sbwait pflogd 18683 505888 0 0 3 0x14000 0x200 bored smr 48384 136915 0 0 2 0x14000 0x200 zerothread 12863 383828 0 0 3 0x14000 0x200 aiodoned aiodoned 37552 94124 0 0 3 0x14000 0x200 syncer update 55187 88742 0 0 3 0x14000 0x200 cleaner cleaner 59981 127390 0 0 3 0x14000 0x200 reaper reaper 42779 383661 0 0 3 0x14000 0x200 pgdaemon pagedaemon 73516 86605 0 0 3