uvm_fault(0xffffff003f12b318, 0x6000100, 0, 1) -> e kernel: page fault trap, code=0 Stopped at switchwrite+0x98: movq 0(%r13),%rbx ddb> ddb> set $lines = 0 ddb> show panic kernel page fault uvm_fault(0xffffff003f12b318, 0x6000100, 0, 1) -> e switchwrite(ffffff002b3db878,ffffff002b3db878,ffff800014b017b8) at switchwrite+0x98 end trace frame: 0xffff800014b01690, count: 0 ddb> trace switchwrite(ffffff002b3db878,ffffff002b3db878,ffff800014b017b8) at switchwrite+0x98 spec_write(ffffffff81e1e918) at spec_write+0xa0 VOP_WRITE(2c,ffffff002b3db878,1,ffff800014b017b8) at VOP_WRITE+0x65 vn_write(ffffff0030ae9cb8,ffff800014b017b8,2c) at vn_write+0x127 dofilewritev(ffff8000ffffd070,ffff800014b01860,2c,ffff800014b01878,83c08c852b8) at dofilewritev+0x13e sys_write(ffff800014b01900,ffff8000ffffd070,ffff8000149cf330) at sys_write+0x6esyscall(0) at syscall+0x3e4 Xsyscall(6,0,c,0,3,839e69aa010) at Xsyscall+0x128 end of kernel end trace frame: 0x83c08c85340, count: -8 ddb> show registers rdi 0xffffffff81e047f8 switch_ifs_lk rsi 0xffffffff81656ce5 switchwrite+0x95 rbp 0xffff800014b01610 rbx 0x6000100 __kernel_end_phys+0x4000100 rdx 0xffff800000acb000 rcx 0x42 rax 0xffff800000acb000 r8 0xffff800014b01860 r9 0 r10 0 r11 0xffffffff81656c50 switchwrite r12 0x2c r13 0x6000100 __kernel_end_phys+0x4000100 r14 0xffff800000aa3b80 r15 0xffff800014b017b8 rip 0xffffffff81656ce8 switchwrite+0x98 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff800014b015b0 ss 0x10 switchwrite+0x98: movq 0(%r13),%rbx ddb> show proc PROC (syz-executor1) pid=373294 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffc4b8,0xffffffff81ed30d8 process=0xffff8000149cf330 user=0xffff800014afc000, vmspace=0xffffff003f12b318 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 93936 458643 9495 0 2 0 syz-executor1 *93936 373294 9495 0 7 0x4000000 syz-executor1 28611 462331 76053 0 2 0 syz-executor0 28611 401640 76053 0 3 0x4000080 ttyout syz-executor0 29867 370272 1 0 3 0x100083 ttyin getty 19924 141277 0 0 3 0x14200 bored sosplice 76053 134885 80120 0 3 0x82 nanosleep syz-executor0 9495 27887 80120 0 3 0x82 nanosleep syz-executor1 80120 31500 92670 0 3 0x82 thrsleep syz-fuzzer 80120 43193 92670 0 3 0x4000082 thrsleep syz-fuzzer 80120 244235 92670 0 3 0x4000082 thrsleep syz-fuzzer 80120 437035 92670 0 3 0x4000082 thrsleep syz-fuzzer 80120 493042 92670 0 3 0x4000082 thrsleep syz-fuzzer 80120 376761 92670 0 3 0x4000082 thrsleep syz-fuzzer 80120 266018 92670 0 3 0x4000082 kqread syz-fuzzer 92670 396841 87621 0 3 0x10008a pause ksh 87621 321453 59819 0 3 0x92 select sshd 59819 306734 1 0 3 0x80 select sshd 33756 103767 95780 73 2 0x100090 syslogd 95780 415410 1 0 3 0x100082 netio syslogd 39750 441965 1 77 3 0x100090 poll dhclient 26796 511272 1 0 3 0x80 poll dhclient 59209 262977 0 0 2 0x14200 zerothread 82847 368574 0 0 3 0x14200 aiodoned aiodoned 36832 258237 0 0 3 0x14200 syncer update 81834 174227 0 0 3 0x14200 cleaner cleaner 54021 501920 0 0 3 0x14200 reaper reaper 27212 198509 0 0 3 0x14200 pgdaemon pagedaemon 52525 211935 0 0 3 0x14200 bored crynlk 39755 412435 0 0 3 0x14200 bored crypto 52790 307305 0 0 3 0x40014200 acpi0 acpi0 52884 315575 0 0 3 0x14200 bored softnet 75426 384960 0 0 3 0x14200 bored systqmp 81519 85871 0 0 3 0x14200 bored systq 54548 455191 0 0 3 0x40014200 bored softclock 33737 421578 0 0 3 0x40014200 idle0 1 153136 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper