login: kernel: protection fault trap, code=0 Stopped at sys_msgrcv+0x3f2: movq 0x10(%r13),%rdi ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace sys_msgrcv(ffff800037bf82b8,ffff80003c435bd0,ffff80003c435b20) at sys_msgrcv+0x3f2 msg_copyout sys/kern/sysv_msg.c:639 [inline] sys_msgrcv(ffff800037bf82b8,ffff80003c435bd0,ffff80003c435b20) at sys_msgrcv+0x3f2 sys/kern/sysv_msg.c:349 syscall(ffff80003c435bd0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c435bd0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1c01c9e4c10, count: -3 ddb{0}> show registers rdi 0 rsi 0x200000000148 rbp 0xffff80003c435af0 rbx 0 rdx 0 rcx 0xffff800037bf82b8 rax 0x76 r8 0x7f7fffffc000 r9 0xfffffd80097fd208 r10 0xb72af24dcbc87ec7 r11 0xde6d4f0381b17691 r12 0xfffffd806c726eb0 r13 0xdead4110dead4110 r14 0xffff8000015aa500 r15 0x76 rip 0xffffffff818f1f22 sys_msgrcv+0x3f2 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff80003c435a50 ss 0x10 sys_msgrcv+0x3f2: movq 0x10(%r13),%rdi ddb{0}> show proc PROC (syz-executor) tid=81433 pid=73908 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=4, usrpri=50, slppri=4, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800037c13780,0xffff800037bf87f8 process=0xffff800037c16b70 user=0xffff80003c430000, vmspace=0xfffffd8067b749b0 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 49398 271102 86041 32767 7 0x10 syz-executor 51286 102849 44536 32767 2 0x3010 syz-executor 73908 343986 26087 32767 2 0x10 syz-executor 73908 63583 26087 32767 2 0x4000010 syz-executor *73908 81433 26087 32767 7 0x4000010 syz-executor 73908 515087 26087 32767 3 0x4000090 fsleep syz-executor 43658 315405 32793 32767 2 0x10 syz-executor 43658 316644 32793 32767 3 0x4000090 fsleep syz-executor 52372 37120 40076 32767 3 0x90 nanoslp syz-executor 52372 352299 40076 32767 3 0x4000090 kqread syz-executor 52372 484019 40076 32767 3 0x4000090 fsleep syz-executor 83895 6285 24081 32767 3 0x90 nanoslp syz-executor 83895 297311 24081 32767 3 0x4000090 sbwait syz-executor 83895 106568 24081 32767 3 0x4000090 fsleep syz-executor 83895 37557 24081 32767 3 0x4000090 fsleep syz-executor 86041 396227 44288 32767 3 0x90 nanoslp syz-executor 32793 251927 13924 32767 3 0x90 nanoslp syz-executor 40076 347270 95928 32767 3 0x90 nanoslp syz-executor 26087 149216 50241 32767 3 0x90 nanoslp syz-executor 44536 135760 89178 32767 3 0x90 nanoslp syz-executor 24081 487030 13891 32767 3 0x90 nanoslp syz-executor 2675 129002 17157 32767 2 0x10 syz-executor 40671 458280 38480 32767 2 0x10 syz-executor 44288 77990 22334 0 3 0x82 wait syz-executor 13924 212477 22334 0 3 0x82 wait syz-executor 50241 430651 22334 0 3 0x82 wait syz-executor 95928 408132 22334 0 3 0x82 wait syz-executor 89178 39022 22334 0 3 0x82 wait syz-executor 13891 191578 22334 0 3 0x82 wait syz-executor 17157 380137 22334 0 3 0x82 wait syz-executor 38480 470889 22334 0 3 0x82 wait syz-executor 22334 149487 74069 0 3 0x82 kqread syz-executor 74069 107058 49487 0 3 0x10008a sigsusp ksh 49487 395927 68470 0 3 0x98 kqread sshd-session 68470 364203 16575 0 3 0x92 kqread sshd-session 25666 12456 1 0 3 0x100083 ttyin getty 16575 277865 1 0 3 0x88 kqread sshd 45816 218642 59191 73 3 0x1100090 kqread syslogd 59191 50997 1 0 3 0x100082 sbwait syslogd 36148 141057 1 0 3 0x100080 kqread resolvd 12480 208030 46536 77 3 0x100092 kqread dhcpleased 41424 485247 46536 77 3 0x100092 kqread dhcpleased 46536 473279 1 0 3 0x80 kqread dhcpleased 38779 183682 0 0 3 0x14200 bored smr 93111 322550 0 0 2 0x14200 zerothread 13660 12431 0 0 3 0x14200 aiodoned aiodoned 41538 179484 0 0 3 0x14200 syncer update 19278 412424 0 0 3 0x14200 cleaner cleaner 69170 236712 0 0 3 0x14200 reaper reaper 26487 46622 0 0 3 0x14200 pgdaemon pagedaemon 87130 136939 0 0 3 0x14200 bored viomb 74553 119402 0 0 3 0x40014200 acpi0 acpi0 44568 21736 0 0 3 0x40014200 idle1 54046 251109 0 0 3 0x14200 bored softnet1 23987 379531 0 0 3 0x14200 bored softnet0 98542 118571 0 0 3 0x14200 bored systqmp 67299 230599 0 0 3 0x14200 bored systq 66899 89895 0 0 3 0x14200 tmoslp softclockmp 60005 169599 0 0 3 0x40014200 tmoslp softclock 8263 307378 0 0 3 0x40014200 idle0 1 482139 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 73908 (syz-executor) thread 0xffff800037bf82b8 (81433) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838cb9c8) #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:369 #3 rwsleep_nsec+0xe9 sys/kern/kern_synch.c:261 #4 uvn_get+0x266 sys/uvm/uvm_vnode.c:1048 #5 uvm_fault_lower_io+0x2ce sys/uvm/uvm_fault.c:1612 #6 uvm_fault_lower+0x28d sys/uvm/uvm_fault.c:1381 #7 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #8 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 #9 kerntrap+0x19c sys/arch/amd64/amd64/trap.c:520 #10 alltraps_kern_meltdown+0x7b #11 copyout+0x64 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #13 Xsyscall+0x128 Process 2675 (syz-executor) thread 0xffff8000fffee7e0 (129002) exclusive rrwlock inode r = 0 (0xfffffd806c6887c8) #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+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8071b0f318) #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+0xbd 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 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11052 12018K 12034K 166960K 12143 0 pcb 17 12K 12K 166960K 17 0 rtable 245 7K 7K 166960K 364 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 2 1K 9K 166960K 6 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 2K 166960K 32 0 iov 0 0K 16K 166960K 44 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1335 84K 84K 166960K 1367 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 15 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 24 89K 121K 166960K 284 0 sigio 0 0K 0K 166960K 3 0 proc 58 99K 147K 166960K 487 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 96 0 in_multi 99 7K 7K 166960K 105 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 369 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 246 159K 171K 166960K 4451 0 UVM aobj 16 4K 4K 166960K 16 0 pinsyscall 45 90K 110K 166960K 1365 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 10 0 NDP 11 0K 2K 166960K 27 0 temp 41 8671K 8735K 166960K 4472 0 kqueue 14 22K 30K 166960K 59 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 48 0 45 1 0 1 1 0 8 0 rtentry 176 115 0 1 6 0 6 6 0 8 0 unpcb 144 207 0 186 2 0 2 2 0 8 0 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpcb 736 69 0 62 2 0 2 2 0 8 1 arp 136 18 0 0 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 328 292 0 278 6 0 6 6 0 8 4 nd6 152 28 0 0 2 0 2 2 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 256 468 0 0 30 0 30 30 0 8 0 art_table 40 469 0 0 5 0 5 5 0 8 0 art_node 32 115 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 2 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 12 0 2 1 0 1 1 0 8 0 shmpl 112 13 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1756 0 250 95 0 95 95 0 8 0 ffsino 296 1756 0 250 117 0 117 117 0 8 0 nchpl 144 2146 0 461 63 0 63 63 0 8 0 vnodes 216 1837 0 0 103 0 103 103 0 8 0 namei 1024 6437 0 6437 1 0 1 1 0 8 1 percpumem 16 50 0 0 1 0 1 1 0 8 0 kstatmem 264 24 0 0 2 0 2 2 0 8 0 scxspl 216 7582 0 7582 9 1 8 8 1 8 8 plimitpl 152 53 0 29 2 0 2 2 0 8 1 sigapl 424 576 0 524 7 0 7 7 0 8 0 knotepl 120 315 0 0 10 0 10 10 0 8 0 kqueuepl 224 128 0 117 5 0 5 5 0 8 4 pipepl 344 125 0 98 3 0 3 3 0 8 0 fdescpl 528 560 0 524 3 0 3 3 0 8 0 filepl 160 2442 0 2215 12 0 12 12 0 8 1 lockfpl 104 51 0 49 1 0 1 1 0 8 0 lockfspl 48 22 0 20 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 33 0 9 1 0 1 1 0 8 0 ucredpl 104 279 0 260 1 0 1 1 0 8 0 zombiepl 144 525 0 524 1 0 1 1 0 8 0 processpl 1232 576 0 524 5 0 5 5 0 8 0 procpl 664 853 0 792 6 0 6 6 0 8 0 sockpl 752 551 0 512 10 0 10 10 0 8 5 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 117 0 0 15 0 15 15 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 597 0 0 38 0 38 38 0 8 0 bufpl 280 2677 0 118 183 0 183 183 0 8 0 anonpl 32 8658 0 0 70 0 70 70 0 246 0 amapchunkpl 152 13080 0 12559 34 0 34 34 0 158 9 amappl16 200 2673 0 2541 20 5 15 18 0 8 5 amappl15 192 13 0 13 1 1 0 1 0 8 0 amappl14 184 8 0 7 1 0 1 1 0 8 0 amappl13 176 409 0 408 1 0 1 1 0 8 0 amappl12 168 923 0 878 3 0 3 3 0 8 0 amappl11 160 7 0 7 1 1 0 1 0 8 0 amappl10 152 40 0 30 1 0 1 1 0 8 0 amappl9 144 244 0 244 1 1 0 1 0 8 0 amappl8 136 21 0 20 1 0 1 1 0 8 0 amappl7 128 75 0 74 1 0 1 1 0 8 0 amappl6 120 275 0 264 1 0 1 1 0 8 0 amappl5 112 82 0 74 1 0 1 1 0 8 0 amappl4 104 394 0 369 1 0 1 1 0 8 0 amappl3 96 2268 0 2153 4 0 4 4 0 8 0 amappl2 88 532 0 477 2 0 2 2 0 8 0 amappl1 80 9879 0 9316 14 0 14 14 0 8 0 amappl 88 3715 0 3538 5 0 5 5 0 92 0 uvmvnodes 80 100 0 0 3 0 3 3 0 8 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 15 0 0 1 0 1 1 0 8 0 uaddrrnd 24 560 0 524 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 560 0 524 1 0 1 1 0 8 0 vmmpekpl 168 6372 0 6337 2 0 2 2 0 8 0 vmmpepl 168 44398 0 42301 107 1 106 107 0 357 3 vmsppl 488 559 0 524 6 0 6 6 0 8 0 rwobjpl 80 15851 0 14804 28 1 27 27 0 8 1 pdppl 4096 1127 0 1048 115 30 85 95 0 8 6 pvpl 32 17836 0 0 144 0 144 144 0 265 0 pmappl 256 559 0 524 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 313 0 32 9 0 9 9 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_msgrcv(ffff800037bf82b8,ffff80003c435bd0,ffff80003c435b20) at sys_msgrcv+0x3f2 msg_copyout sys/kern/sysv_msg.c:639 [inline] sys_msgrcv(ffff800037bf82b8,ffff80003c435bd0,ffff80003c435b20) at sys_msgrcv+0x3f2 sys/kern/sysv_msg.c:349 syscall(ffff80003c435bd0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c435bd0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1c01c9e4c10, count: -3 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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(ffffffff838cb7c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838cb7c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80003c481380) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c481380) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71596357f5a0, count: -6