kernel: protection fault trap, code=0 Stopped at sys_msgrcv+0x2df: movq 0x10(%r13),%rdi ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace sys_msgrcv(ffff8000ffff0550,ffff80002e4bea78,ffff80002e4beac0) at sys_msgrcv+0x2df msg_copyout sys/kern/sysv_msg.c:639 [inline] sys_msgrcv(ffff8000ffff0550,ffff80002e4bea78,ffff80002e4beac0) at sys_msgrcv+0x2df sys/kern/sysv_msg.c:349 syscall(ffff80002e4beb40) at syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e4beb40) at syscall+0x438 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9620ecccb00, count: -3 ddb{1}> show registers rdi 0x1b rsi 0x20003b08 rbp 0xffff80002e4bea60 rbx 0x1b rdx 0 rcx 0 rax 0xffff8000ffff0550 r8 0x7f7fffffc000 r9 0x1 r10 0x6334fe9a024782a4 r11 0x7ae62a3f5e06fccc r12 0xfffffd8067b42f50 r13 0xdead4110dead4110 r14 0xffff800000c34d00 r15 0x1b rip 0xffffffff820ece9f sys_msgrcv+0x2df cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80002e4be9d0 ss 0x10 sys_msgrcv+0x2df: movq 0x10(%r13),%rdi ddb{1}> show proc PROC (syz-executor.0) pid=285065 stat=onproc flags process=10 proc=4000000 pri=36, usrpri=66, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffeea80,0xffff8000ffff3518 process=0xffff8000267aa198 user=0xffff80002e4b9000, vmspace=0xfffffd806be6e8b0 estcpu=16, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 32139 427900 36127 32767 3 0x90 nanoslp syz-executor.0 *32139 285065 36127 32767 7 0x4000010 syz-executor.0 32139 39026 36127 32767 2 0x4000010 syz-executor.0 32139 371231 36127 32767 2 0x4000010 syz-executor.0 32139 70164 36127 32767 7 0x4000010 syz-executor.0 32139 483867 36127 32767 2 0x4000010 syz-executor.0 32139 432117 36127 32767 2 0x4000010 syz-executor.0 95591 62449 80818 32767 3 0x90 nanoslp syz-executor.2 95591 310049 80818 32767 3 0x4000090 nanoslp syz-executor.2 95591 72741 80818 32767 3 0x4000090 fsleep syz-executor.2 12979 157780 0 0 3 0x14200 bored sosplice 79108 23997 89200 32767 3 0x90 piperd syz-executor.7 89200 499186 48526 0 3 0x82 wait syz-executor.7 80530 427288 41364 32767 3 0x90 piperd syz-executor.6 41364 490665 48526 0 3 0x82 wait syz-executor.6 12169 68984 27315 32767 3 0x90 nanoslp syz-executor.4 48970 302788 36451 32767 3 0x90 piperd syz-executor.5 36451 465548 48526 0 3 0x82 wait syz-executor.5 4254 282046 82642 32767 3 0x10 biowait syz-executor.3 27315 378341 48526 0 3 0x82 wait syz-executor.4 80818 508224 91064 32767 3 0x90 nanoslp syz-executor.2 82642 38868 48526 0 3 0x82 wait syz-executor.3 91064 233082 48526 0 3 0x82 wait syz-executor.2 68758 136258 69825 32767 3 0x90 piperd syz-executor.1 69825 484389 48526 0 3 0x82 wait syz-executor.1 36127 100481 87253 32767 3 0x90 nanoslp syz-executor.0 87253 362530 48526 0 3 0x82 wait syz-executor.0 48526 331608 37438 0 3 0x82 thrsleep syz-fuzzer 48526 191637 37438 0 3 0x4000082 thrsleep syz-fuzzer 48526 387090 37438 0 3 0x4000082 wait syz-fuzzer 48526 160336 37438 0 3 0x4000082 thrsleep syz-fuzzer 48526 224011 37438 0 3 0x4000082 wait syz-fuzzer 48526 233138 37438 0 3 0x4000082 wait syz-fuzzer 48526 195928 37438 0 3 0x4000082 wait syz-fuzzer 48526 247793 37438 0 3 0x4000082 wait syz-fuzzer 48526 153769 37438 0 3 0x4000082 thrsleep syz-fuzzer 48526 75605 37438 0 3 0x4000082 wait syz-fuzzer 48526 419199 37438 0 3 0x4000082 wait syz-fuzzer 48526 169011 37438 0 3 0x4000082 wait syz-fuzzer 48526 43278 37438 0 3 0x4000082 kqread syz-fuzzer 48526 220202 37438 0 3 0x4000082 thrsleep syz-fuzzer 48526 375209 37438 0 3 0x4000082 thrsleep syz-fuzzer 37438 35940 92232 0 3 0x10008a sigsusp ksh 92232 466805 51150 0 3 0x9a kqread sshd 37615 472164 1 0 3 0x100083 ttyin getty 51150 420253 1 0 3 0x88 kqread sshd 91654 254659 55313 73 3 0x1100090 kqread syslogd 55313 446750 1 0 3 0x100082 netio syslogd 2314 20188 1 0 3 0x100080 kqread resolvd 50043 111594 33433 77 3 0x100092 kqread dhcpleased 48244 196634 33433 77 3 0x100092 kqread dhcpleased 33433 252942 1 0 3 0x80 kqread dhcpleased 8225 63957 0 0 3 0x14200 bored smr 67441 501797 0 0 2 0x14200 zerothread 39046 13282 0 0 3 0x14200 aiodoned aiodoned 30058 419662 0 0 3 0x14200 syncer update 33078 91571 0 0 3 0x14200 cleaner cleaner 77791 278715 0 0 3 0x14200 reaper reaper 68173 522502 0 0 3 0x14200 pgdaemon pagedaemon 9241 183698 0 0 3 0x14200 bored viomb 8803 350126 0 0 3 0x40014200 acpi0 acpi0 98289 328732 0 0 3 0x40014200 idle1 71304 354677 0 0 3 0x14200 bored softnet 55450 96726 0 0 3 0x14200 bored softnet 98048 185885 0 0 3 0x14200 bored softnet 84278 242255 0 0 3 0x14200 bored softnet 56858 491625 0 0 3 0x14200 bored systqmp 90617 216426 0 0 3 0x14200 bored systq 35448 95047 0 0 3 0x40014200 bored softclock 69417 472844 0 0 3 0x40014200 idle0 1 362675 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 32139 (syz-executor.0) thread 0xffff8000ffff0550 (285065) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82a01680) #0 witness_lock+0x44d #1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 #2 mi_switch+0x3bb sys/kern/sched_bsd.c:415 #3 sleep_finish+0x180 sys/kern/kern_synch.c:417 #4 rw_enter+0x35a sys/kern/kern_rwlock.c:286 #5 uvmfault_lookup+0xc9 sys/uvm/uvm_fault.c:1773 #6 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:673 #7 uvm_fault+0xf2 sys/uvm/uvm_fault.c:601 #8 kpageflttrap+0x22e sys/arch/amd64/amd64/trap.c:277 #9 kerntrap+0xef sys/arch/amd64/amd64/trap.c:332 #10 alltraps_kern_meltdown+0x7b #11 copyout+0x53 #12 syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline] #12 syscall+0x438 sys/arch/amd64/amd64/trap.c:599 #13 Xsyscall+0x128 Process 4254 (syz-executor.3) thread 0xffff8000ffff2008 (282046) exclusive rrwlock inode r = 0 (0xfffffd8066dec0a8) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vget+0x1fc sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1324 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6e5 sys/kern/vfs_lookup.c:560 #11 namei+0x36a sys/kern/vfs_lookup.c:244 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1848 #13 syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline] #13 syscall+0x438 sys/arch/amd64/amd64/trap.c:599 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b8b23c8) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:412 #6 namei+0x36a sys/kern/vfs_lookup.c:244 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1848 #8 syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline] #8 syscall+0x438 sys/arch/amd64/amd64/trap.c:599 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10193 6409K 6420K 78643K 11283 0 pcb 13 8K 8K 78643K 13 0 rtable 234 6K 6K 78643K 374 0 ifaddr 71 16K 16K 78643K 73 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 35K 78643K 60 0 ioctlops 0 0K 2K 78643K 66 0 iov 0 0K 20K 78643K 104 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1272 80K 80K 78643K 1450 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 20 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 256 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 20 73K 117K 78643K 610 0 proc 56 78K 103K 78643K 509 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 40 0 in_multi 99 6K 6K 78643K 99 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 67 307K 307K 78643K 67 0 exec 0 0K 1K 78643K 432 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 298 81K 85K 78643K 5889 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 20 0 NDP 11 0K 2K 78643K 27 0 temp 105 4685K 4749K 78643K 4939 0 kqueue 12 18K 24K 78643K 71 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 128 0 125 3 0 3 3 0 8 2 rtentry 112 111 0 1 4 0 4 4 0 8 0 unpcb 144 1409 0 1392 6 0 6 6 0 8 5 syncache 296 11 0 11 2 1 1 1 0 8 1 tcpqe 32 69 0 69 3 2 1 1 0 8 1 tcpcb 776 158 0 154 5 1 4 5 0 8 3 arp 120 18 0 0 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 3 0 2 1 0 1 1 0 8 0 inpcb 368 405 0 398 5 1 4 5 0 8 3 nd6 48 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 453 0 0 29 0 29 29 0 8 0 art_table 32 454 0 0 4 0 4 4 0 8 0 art_node 16 110 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 12 1 0 1 1 0 8 1 semapl 112 252 0 242 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2185 0 753 90 0 90 90 0 8 0 ffsino 272 2185 0 753 96 0 96 96 0 8 0 nchpl 144 3077 0 1413 63 0 63 63 0 8 0 uvmvnodes 80 2298 0 0 47 0 47 47 0 8 0 vnodes 216 2298 0 0 128 0 128 128 0 8 0 namei 1024 10602 0 10602 3 2 1 2 0 8 1 percpumem 16 42 0 0 1 0 1 1 0 8 0 kstatmem 264 22 0 0 2 0 2 2 0 8 0 scxspl 216 9325 0 9324 9 3 6 8 0 8 5 plimitpl 152 157 0 134 2 0 2 2 0 8 1 sigapl 424 889 0 839 7 0 7 7 0 8 0 futexpl 64 4691 0 4690 1 0 1 1 0 8 0 knotepl 120 230 0 0 7 0 7 7 0 8 0 kqueuepl 216 141 0 133 3 2 1 3 0 8 0 pipepl 320 252 0 224 8 0 8 8 0 8 5 fdescpl 496 871 0 840 7 2 5 6 0 8 0 filepl 152 5900 0 5663 15 0 15 15 0 8 5 lockfpl 104 78 0 76 1 0 1 1 0 8 0 lockfspl 48 25 0 23 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 27 0 11 1 0 1 1 0 8 0 ucredpl 104 966 0 948 1 0 1 1 0 8 0 zombiepl 144 840 0 839 1 0 1 1 0 8 0 processpl 1072 889 0 839 5 1 4 5 0 8 0 procpl 672 1931 0 1859 8 0 8 8 0 8 1 sosppl 168 7 0 7 1 0 1 1 0 8 1 sockpl 488 1951 0 1924 38 27 11 20 0 8 7 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 7 0 0 1 0 1 1 0 8 0 mcl12k 12288 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 11 0 0 2 0 2 2 0 8 0 mcl4k 4096 8 0 0 1 0 1 1 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 369 0 0 46 0 46 46 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1358 0 0 84 0 84 84 0 8 0 bufpl 288 4597 0 142 319 0 319 319 0 8 0 anonpl 24 227381 0 214635 105 6 99 104 0 186 6 amapchunkpl 152 16676 0 15989 37 3 34 37 0 158 3 amappl16 200 3562 0 3257 28 8 20 28 0 8 3 amappl15 192 8 0 7 1 0 1 1 0 8 0 amappl14 184 128 0 118 1 0 1 1 0 8 0 amappl13 176 8 0 8 2 2 0 1 0 8 0 amappl12 168 393 0 387 1 0 1 1 0 8 0 amappl11 160 49 0 38 1 0 1 1 0 8 0 amappl10 152 34 0 21 1 0 1 1 0 8 0 amappl9 144 958 0 957 1 0 1 1 0 8 0 amappl8 136 173 0 119 2 0 2 2 0 8 0 amappl7 128 134 0 113 2 0 2 2 0 8 0 amappl6 120 155 0 142 1 0 1 1 0 8 0 amappl5 112 126 0 119 1 0 1 1 0 8 0 amappl4 104 450 0 424 2 1 1 2 0 8 0 amappl3 96 2110 0 2058 2 0 2 2 0 8 0 amappl2 88 1256 0 1181 3 1 2 3 0 8 0 amappl1 80 22023 0 21309 23 5 18 22 0 8 0 amappl 88 5411 0 5223 7 1 6 6 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 871 0 840 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 871 0 840 1 0 1 1 0 8 0 vmmpekpl 168 12411 0 12369 3 0 3 3 0 8 0 vmmpepl 168 87839 0 85365 140 5 135 140 0 357 10 vmsppl 368 870 0 840 4 0 4 4 0 8 0 rwobjpl 56 28281 0 24472 56 0 56 56 0 8 0 pdppl 4096 1749 0 1680 115 34 81 91 0 8 12 pvpl 32 482547 0 464084 269 14 255 269 0 265 88 pmappl 248 870 0 840 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 803 0 39 22 0 22 22 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff829ceff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 kd_curproc sys/dev/kcov.c:577 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 sys/dev/kcov.c:148 __mp_lock(ffffffff82a01478) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82a01478) at __mp_lock+0x133 sys/kern/kern_lock.c:147 intr_handler(ffff8000247a61f0,ffff80000006ba00) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge21_untramp() at Xintr_ioapic_edge21_untramp+0x18f __mp_lock(ffffffff82a01478) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82a01478) at __mp_lock+0x129 sys/kern/kern_lock.c:147 end trace frame: 0x0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at sys_msgrcv+0x2df: movq 0x10(%r13),%rdi ddb{1}> trace sys_msgrcv(ffff8000ffff0550,ffff80002e4bea78,ffff80002e4beac0) at sys_msgrcv+0x2df msg_copyout sys/kern/sysv_msg.c:639 [inline] sys_msgrcv(ffff8000ffff0550,ffff80002e4bea78,ffff80002e4beac0) at sys_msgrcv+0x2df sys/kern/sysv_msg.c:349 syscall(ffff80002e4beb40) at syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e4beb40) at syscall+0x438 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9620ecccb00, count: -3