kernel: protection fault trap, code=0 Stopped at sys_msgrcv+0x3f2: 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(ffff80002a2e47e8,ffff80003c4659f0,ffff80003c465940) at sys_msgrcv+0x3f2 msg_copyout sys/kern/sysv_msg.c:639 [inline] sys_msgrcv(ffff80002a2e47e8,ffff80003c4659f0,ffff80003c465940) at sys_msgrcv+0x3f2 sys/kern/sysv_msg.c:349 syscall(ffff80003c4659f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4659f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3fa63d76190, count: -3 ddb{1}> show registers rdi 0 rsi 0x2000000000c8 rbp 0xffff80003c465910 rbx 0 rdx 0 rcx 0xffff80002a2e47e8 rax 0x2a r8 0x7f7fffffc000 r9 0x1 r10 0xe06901583e57422e r11 0x6ded6f724ad8ab77 r12 0xfffffd8068044f00 r13 0xdeadbeefdeadbeef r14 0xffff800001489900 r15 0 rip 0xffffffff819917a2 sys_msgrcv+0x3f2 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80003c465870 ss 0x10 sys_msgrcv+0x3f2: movq 0x10(%r13),%rdi ddb{1}> show proc PROC (syz-executor) tid=204249 pid=58373 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=36, usrpri=50, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2e4020,0xffff80003c458038 process=0xffff80003c454ea0 user=0xffff80003c460000, vmspace=0xfffffd806bc15030 estcpu=20, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 52670 294759 40205 32767 2 0x10 syz-executor 96998 346821 47591 32767 2 0x10 syz-executor 96998 512281 47591 32767 3 0x4000090 ttyin syz-executor 96998 369510 47591 32767 2 0x4000010 syz-executor 96998 1822 47591 32767 3 0x4000090 kqread syz-executor 58373 457409 7688 32767 2 0x10 syz-executor 58373 307067 7688 32767 3 0x4000090 fsleep syz-executor *58373 204249 7688 32767 7 0x4000010 syz-executor 58373 227583 7688 32767 2 0x4000010 syz-executor 65322 203705 6392 32767 2 0x10 syz-executor 65322 272058 6392 32767 3 0x4000090 fsleep syz-executor 65322 275639 6392 32767 3 0x4000090 fsleep syz-executor 3525 437822 8469 32767 2 0x10 syz-executor 7688 249829 94012 32767 3 0x90 nanoslp syz-executor 6392 137581 13505 32767 3 0x90 nanoslp syz-executor 47591 219165 24115 32767 3 0x90 nanoslp syz-executor 40205 438270 98410 32767 3 0x90 nanoslp syz-executor 24231 218521 7937 32767 3 0x90 nanoslp syz-executor 91526 347054 29086 32767 3 0x10 biowait syz-executor 94949 40583 21079 32767 3 0x90 nanoslp syz-executor 8469 229379 730 32767 3 0x90 nanoslp syz-executor 94012 158735 76773 0 3 0x82 wait syz-executor 24115 255692 76773 0 3 0x82 wait syz-executor 13505 273013 76773 0 3 0x82 wait syz-executor 98410 302419 76773 0 3 0x82 wait syz-executor 21079 11721 76773 0 3 0x82 wait syz-executor 29086 361640 76773 0 3 0x82 wait syz-executor 7937 360730 76773 0 3 0x82 wait syz-executor 730 3278 76773 0 3 0x82 wait syz-executor 76773 299859 3346 0 3 0x82 kqread syz-executor 3346 45608 99575 0 3 0x10008a sigsusp ksh 99575 177893 14782 0 3 0x98 kqread sshd-session 14782 259621 75710 0 3 0x92 kqread sshd-session 34133 30297 1 0 3 0x100083 ttyin getty 75710 502809 1 0 3 0x88 kqread sshd 23831 14446 88826 73 3 0x1100090 kqread syslogd 88826 48217 1 0 3 0x100082 sbwait syslogd 62397 101509 1 0 3 0x100080 kqread resolvd 86708 31144 70517 77 3 0x100092 kqread dhcpleased 4929 172861 70517 77 3 0x100092 kqread dhcpleased 70517 12288 1 0 3 0x80 kqread dhcpleased 94303 254457 0 0 3 0x14200 bored smr 27592 347947 0 0 2 0x14200 zerothread 79073 126288 0 0 3 0x14200 aiodoned aiodoned 60993 117883 0 0 3 0x14200 syncer update 10684 308079 0 0 3 0x14200 cleaner cleaner 9203 366328 0 0 7 0x14200 reaper 19301 105653 0 0 3 0x14200 pgdaemon pagedaemon 21083 419319 0 0 3 0x14200 bored viomb 99449 509940 0 0 3 0x40014200 acpi0 acpi0 96090 302110 0 0 3 0x40014200 idle1 76802 354715 0 0 3 0x14200 bored softnet7 30642 429314 0 0 3 0x14200 bored softnet6 78559 38878 0 0 3 0x14200 bored softnet5 57037 156996 0 0 3 0x14200 bored softnet4 38259 170574 0 0 3 0x14200 bored softnet3 83232 7872 0 0 3 0x14200 bored softnet2 12040 150932 0 0 3 0x14200 bored softnet1 41372 513892 0 0 3 0x14200 bored softnet0 58819 422152 0 0 3 0x14200 bored systqmp 27647 1254 0 0 3 0x14200 bored systq 19658 13342 0 0 3 0x14200 tmoslp softclockmp 47232 25434 0 0 3 0x40014200 tmoslp softclock 40244 444377 0 0 3 0x40014200 idle0 1 415969 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 58373 (syz-executor) thread 0xffff80002a2e47e8 (204249) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838ab350) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 sleep_finish+0x2d8 sys/kern/kern_synch.c:367 #3 rw_do_enter_read+0x309 sys/kern/kern_rwlock.c:-1 #4 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1924 #5 uvm_fault_check+0x4a sys/uvm/uvm_fault.c:741 #6 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #7 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 #8 kerntrap+0x198 sys/arch/amd64/amd64/trap.c:491 #9 alltraps_kern_meltdown+0x7b #10 copyout+0x57 #11 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #12 Xsyscall+0x128 Process 91526 (syz-executor) thread 0xffff80002a2e5ca8 (347054) exclusive rrwlock inode r = 0 (0xfffffd80679da7d0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3113 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806d0870c8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10193 10956K 10968K 166960K 11271 0 pcb 17 12K 12K 166960K 17 0 rtable 207 5K 6K 166960K 255 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 1 1K 9K 166960K 5 0 counters 68 36K 36K 166960K 68 0 ioctlops 0 0K 2K 166960K 29 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1354 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 7 0 dirhash 15 2K 3K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 24 89K 117K 166960K 173 0 sigio 0 0K 0K 166960K 1 0 proc 58 99K 131K 166960K 479 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 7 0 in_multi 99 7K 7K 166960K 100 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 337 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 247 161K 175K 166960K 3001 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 45 90K 108K 166960K 1165 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 1 0 NDP 27 2K 2K 166960K 27 0 temp 36 8638K 8702K 166960K 3729 0 kqueue 13 20K 22K 166960K 22 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 36 0 33 1 0 1 1 0 8 0 rtentry 176 96 0 1 5 0 5 5 0 8 0 unpcb 144 51 0 36 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 14 0 10 1 0 1 1 0 8 0 arp 128 11 0 0 1 0 1 1 0 8 0 inpcb 328 112 0 71 4 0 4 4 0 8 0 nd6 144 16 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 256 438 0 0 28 0 28 28 0 8 0 art_table 40 439 0 0 5 0 5 5 0 8 0 art_node 32 96 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 4 0 1 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 25 0 6 3 0 3 3 0 8 0 dino2pl 256 1604 0 94 95 0 95 95 0 8 0 ffsino 296 1604 0 94 117 0 117 117 0 8 0 nchpl 144 1814 0 138 63 0 63 63 0 8 0 uvmvnodes 80 1685 0 0 35 0 35 35 0 8 0 vnodes 216 1685 0 0 94 0 94 94 0 8 0 namei 1024 5385 0 5384 1 0 1 1 0 8 0 percpumem 16 49 0 0 1 0 1 1 0 8 0 kstatmem 264 24 0 0 2 0 2 2 0 8 0 scxspl 216 6649 0 6648 4 1 3 3 1 8 2 plimitpl 152 41 0 15 2 0 2 2 0 8 0 sigapl 424 447 0 388 8 0 8 8 0 8 0 knotepl 120 54 0 0 2 0 2 2 0 8 0 kqueuepl 224 21 0 11 1 0 1 1 0 8 0 pipepl 344 99 0 72 3 0 3 3 0 8 0 fdescpl 528 425 0 389 3 0 3 3 0 8 0 filepl 160 1522 0 1275 12 0 12 12 0 8 1 lockfpl 104 10 0 8 1 0 1 1 0 8 0 lockfspl 48 6 0 4 1 0 1 1 0 8 0 sessionpl 144 21 0 5 1 0 1 1 0 8 0 pgrppl 48 30 0 5 1 0 1 1 0 8 0 ucredpl 104 142 0 123 1 0 1 1 0 8 0 zombiepl 144 390 0 388 1 0 1 1 0 8 0 processpl 1232 447 0 388 7 1 6 6 0 8 0 procpl 664 505 0 438 6 0 6 6 0 8 0 sockpl 752 199 0 140 7 0 7 7 0 8 1 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 125 0 0 16 0 16 16 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 159 0 0 10 0 10 10 0 8 0 bufpl 280 2921 0 116 201 0 201 201 0 8 0 anonpl 32 5167 0 0 42 0 42 42 0 246 0 amapchunkpl 152 9600 0 8864 40 3 37 37 0 158 6 amappl16 200 1850 0 1832 5 0 5 5 0 8 4 amappl15 192 5 0 5 1 0 1 1 0 8 1 amappl14 184 112 0 102 1 0 1 1 0 8 0 amappl13 176 1 0 0 1 0 1 1 0 8 0 amappl12 168 1017 0 981 2 0 2 2 0 8 0 amappl11 160 122 0 112 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 0 1 1 0 8 1 amappl9 144 251 0 251 1 0 1 1 0 8 1 amappl8 136 53 0 52 1 0 1 1 0 8 0 amappl7 128 90 0 79 1 0 1 1 0 8 0 amappl6 120 178 0 175 1 0 1 1 0 8 0 amappl5 112 115 0 109 1 0 1 1 0 8 0 amappl4 104 258 0 243 1 0 1 1 0 8 0 amappl3 96 1364 0 1237 4 0 4 4 0 8 0 amappl2 88 600 0 546 2 0 2 2 0 8 0 amappl1 80 7911 0 7345 13 0 13 13 0 8 0 amappl 88 2390 0 2207 5 0 5 5 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 425 0 389 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 425 0 389 1 0 1 1 0 8 0 vmmpekpl 168 4870 0 4837 2 0 2 2 0 8 0 vmmpepl 168 33558 0 31512 94 0 94 94 0 357 1 vmsppl 488 424 0 388 7 1 6 6 0 8 0 rwobjpl 80 13689 0 11169 52 0 52 52 0 8 0 pdppl 4096 858 0 776 104 10 94 94 0 8 12 pvpl 32 10545 0 0 86 0 86 86 0 265 0 pmappl 256 424 0 388 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 271 0 13 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff837b6ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff838ab148) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838ab148) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80002a268380,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xspllower() at Xspllower+0x1d km_free(ffff800033410000,6000,ffffffff8344f6f8,ffffffff835287f8) at km_free+0x36b sys/uvm/uvm_km.c:827 uvm_uarea_free(ffff80003c459250) at uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304 reaper(ffff8000ffffc2a0) at reaper+0x1aa sys/kern/kern_exit.c:493 end trace frame: 0x0, count: -10 ddb{0}> machine ddbcpu 1 Stopped at sys_msgrcv+0x3f2: movq 0x10(%r13),%rdi ddb{1}> trace sys_msgrcv(ffff80002a2e47e8,ffff80003c4659f0,ffff80003c465940) at sys_msgrcv+0x3f2 msg_copyout sys/kern/sysv_msg.c:639 [inline] sys_msgrcv(ffff80002a2e47e8,ffff80003c4659f0,ffff80003c465940) at sys_msgrcv+0x3f2 sys/kern/sysv_msg.c:349 syscall(ffff80003c4659f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4659f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3fa63d76190, count: -3