kernel: double fault trap, code=0 Stopped at restore_saved+0x32: xorq 0x30(%rsp),%r11 ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace end trace frame: 0x0, count: -1 ddb{1}> show registers rdi 0xffffffff83a4b000 end+0x24b000 rsi 0xffff8000ffffc010 rbp 0 rbx 0 rdx 0 rcx 0xfffffd806854a5e0 rax 0x1b r8 0x7f7fffffc000 r9 0x1 r10 0xe0192e5662ac8014 r11 0x3224037e83a9826f r12 0xffff8000ffffc010 r13 0xffff80002a0e7000 r14 0 r15 0xffff8000ffff6f50 rip 0xffffffff813691dc restore_saved+0x32 cs 0x8 rflags 0x10046 __ALIGN_SIZE+0xf046 rsp 0 ss 0x10 restore_saved+0x32: xorq 0x30(%rsp),%r11 ddb{1}> show proc PROC (syz-executor) tid=199852 pid=18380 tcnt=1 stat=onproc flags process=8000002 proc=480 runpri=32, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff7bf8,0xffff8000ffffd460 process=0xffff800037263628 user=0xffff80002a0e7000, vmspace=0xfffffd806bea7528 estcpu=36, cpticks=0, pctcpu=0.3, user=0, sys=3, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 16656 138272 19012 0 2 0x8000000 syz-executor 28710 172838 92784 0 7 0x8000000 syz-executor 28710 167908 92784 0 2 0xc000000 syz-executor 32035 225643 99455 0 2 0x8000480 syz-executor 32035 27726 99455 0 3 0xc000080 sbwait syz-executor 32035 54597 99455 0 3 0xc000080 fsleep syz-executor 2187 201985 81456 0 3 0x8000080 nanoslp syz-executor 2187 459133 81456 0 3 0xc000080 sbwait syz-executor 2187 59142 81456 0 3 0xc000080 fsleep syz-executor 50798 455623 18380 0 3 0x8000080 nanoslp syz-executor 50798 348674 18380 0 3 0xc000080 kqsel syz-executor 50798 433109 18380 0 3 0xc000080 fsleep syz-executor 25689 325331 2019 0 4 0x8082000 syz-executor 25689 193653 2019 0 3 0xc082000 smrbar syz-executor 25689 53179 2019 0 3 0xc002000 suspend syz-executor 99455 500239 53254 0 2 0x8000482 syz-executor 19012 477383 53254 0 3 0x8000082 nanoslp syz-executor *18380 199852 53254 0 7 0x8000482 syz-executor 56318 328923 53254 0 3 0x8000002 biowait syz-executor 81456 150746 53254 0 3 0x8000082 nanoslp syz-executor 92784 297412 53254 0 3 0x8000082 nanoslp syz-executor 2019 33133 53254 0 3 0x8000082 nanoslp syz-executor 36854 349270 1 0 3 0x18100083 ttyin getty 96004 325701 0 0 3 0x14200 bored sosplice 68381 174703 97982 0 3 0x18100082 sbwait ndp 97982 481914 15375 0 3 0x810008a sigsusp sh 15375 192472 53254 0 3 0x8000082 wait syz-executor 53254 65752 9150 0 3 0x8000082 kqread syz-executor 9150 250355 73797 0 3 0x810008a sigsusp ksh 73797 451415 24246 0 3 0x18000098 kqread sshd-session 24246 218770 95093 0 3 0x18000092 kqread sshd-session 95093 245738 1 0 3 0x18000088 kqread sshd 27694 288843 18892 74 3 0x19100092 bpf pflogd 18892 141519 1 0 3 0x18000080 sbwait pflogd 73800 163762 45652 73 2 0x19100010 syslogd 45652 285894 1 0 3 0x18100082 sbwait syslogd 63555 399420 1 0 3 0x18100080 kqread resolvd 42276 337491 91523 77 3 0x18100092 kqread dhcpleased 56791 127548 91523 77 3 0x18100092 kqread dhcpleased 91523 417339 1 0 3 0x18000080 kqread dhcpleased 93554 498821 0 0 3 0x14200 pause smr 66747 56129 0 0 2 0x14200 zerothread 70864 466290 0 0 3 0x14200 aiodoned aiodoned 98444 120302 0 0 3 0x14200 syncer update 56668 12784 0 0 3 0x14200 cleaner cleaner 7749 230411 0 0 3 0x14200 reaper reaper 45806 392967 0 0 3 0x14200 pgdaemon pagedaemon 38454 319219 0 0 3 0x14200 bored viomb 76475 469471 0 0 3 0x40014200 acpi0 acpi0 87508 156782 0 0 3 0x40014200 idle1 86259 349266 0 0 3 0x14200 bored softnet3 44923 407577 0 0 3 0x14200 bored softnet2 84931 87726 0 0 3 0x14200 bored softnet1 40887 501568 0 0 3 0x14200 bored softnet0 26850 441551 0 0 3 0x14200 bored systqmp 52486 322832 0 0 3 0x14200 bored systq 41209 365743 0 0 3 0x14200 tmoslp softclockmp 4672 110919 0 0 3 0x40014200 tmoslp softclock 2111 45119 0 0 3 0x40014200 idle0 1 450762 0 0 3 0x8000082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff83572ce0) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 mtx_enter_try+0x178 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 sleep_finish+0x1b9 sys/kern/kern_synch.c:400 #4 sys_nanosleep+0x28a sys/kern/kern_time.c:301 #5 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline] #5 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #6 Xsyscall+0x128 Process 28710 (syz-executor) thread 0xffff800036d9acd0 (172838) exclusive kernel_lock &kernel_lock r = 2 (0xffffffff835026f0) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 #2 Xintr_ioapic_edge23_untramp+0x18f Process 25689 (syz-executor) thread 0xffff800036d9a2b0 (193653) exclusive rwlock clonelk r = 0 (0xffffffff83434c00) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 if_clone_destroy+0x67 #2 tun_dev_close+0x1ce sys/net/if_tun.c:521 #3 spec_close+0x412 #4 VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 #5 vn_close+0xa3 sys/kern/vfs_vnops.c:292 #6 vndioctl+0xde5 sys/dev/vnd.c:474 #7 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #8 vn_ioctl+0xf6 sys/kern/vfs_vnops.c:525 #9 sys_ioctl+0x67c #10 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline] #10 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 Process 56318 (syz-executor) thread 0xffff8000ffff7bf8 (328923) exclusive rrwlock inode r = 0 (0xfffffd807c1a7918) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:120 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0x113 sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x102 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3100 #10 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #10 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8078e84e78) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3085 #8 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #8 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10229 10572K 10572K 166960K 12783 0 pcb 18 17K 18K 166960K 304 0 rtable 241 16K 17K 166960K 852 0 pf 42 18K 22K 166960K 113 0 ifaddr 45 7K 8K 166960K 119 0 ifgroup 68 2K 2K 166960K 144 0 sysctl 2 1K 1K 166960K 3 0 counters 70 37K 37K 166960K 112 0 ioctlops 0 0K 4K 166960K 1638 0 iov 0 0K 16K 166960K 107 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1453 91K 92K 166960K 2296 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 21 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 83 0 dirhash 12 2K 2K 166960K 39 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 18 65K 93K 166960K 906 0 sigio 0 0K 0K 166960K 52 0 proc 70 91K 140K 166960K 1011 0 subproc 104 6K 8K 166960K 286 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 86 0 in_multi 98 7K 7K 166960K 269 0 ether_multi 1 0K 0K 166960K 2 0 mrt 2 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 627 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 241 73K 91K 166960K 9486 0 UVM aobj 99 5K 5K 166960K 101 0 pinsyscall 44 88K 104K 166960K 2351 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 53 0 NDP 23 1K 2K 166960K 80 0 temp 77 6816K 14743K 166960K 27705 0 kqueue 13 20K 30K 166960K 101 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 107 0 102 1 0 1 1 0 8 0 rtentry 112 288 0 181 4 0 4 4 0 8 0 unpcb 144 904 0 874 9 6 3 6 0 8 1 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 808 368 0 362 7 5 2 7 0 8 1 arp 120 50 0 32 1 0 1 1 0 8 0 inpcb 336 1311 0 1300 17 13 4 12 0 8 2 nd6 136 72 0 49 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 22 0 14 1 0 1 1 0 8 0 ppxss 1168 4 0 4 2 2 0 1 0 8 0 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 8 0 2 1 0 1 1 0 482 0 pffrnode 88 8 0 2 1 0 1 1 0 8 0 pffrent 40 128 0 122 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfrktable 1344 4 0 1 1 0 1 1 0 8 0 pfanchor 1288 3 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 90 0 35 1 0 1 1 0 8 0 pfstkey 128 92 0 37 3 0 3 3 0 8 0 pfstate 376 90 0 36 7 0 7 7 0 8 0 pfrule 1344 38 0 29 2 0 2 2 0 8 0 rttmr 136 1 0 0 1 0 1 1 0 8 0 art_heap8 4096 2 0 1 2 0 2 2 0 8 1 art_heap4 256 1106 0 653 33 4 29 30 0 8 0 art_table 32 1108 0 654 4 0 4 4 0 8 0 art_node 16 283 0 186 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 2 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 79 0 69 1 0 1 1 0 8 0 shmpl 112 98 0 2 3 0 3 3 0 8 0 dirhash 1024 35 0 18 3 0 3 3 0 8 0 dino2pl 256 2807 0 1280 96 0 96 96 0 8 0 ffsino 272 2807 0 1280 103 0 103 103 0 8 0 nchpl 144 3900 0 2188 64 0 64 64 0 8 0 uvmvnodes 80 3533 0 0 73 0 73 73 0 8 0 vnodes 216 3533 0 0 197 0 197 197 0 8 0 namei 1024 16151 0 16150 2 1 1 2 0 8 0 percpumem 16 70 0 21 1 0 1 1 0 8 0 vcpupl 3904 3 0 1 1 0 1 1 0 8 0 vmpool 696 5 0 3 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 0 1 0 1 1 0 8 0 kstatmem 264 72 0 42 3 1 2 3 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 16713 0 16712 10 7 3 8 1 8 2 plimitpl 152 271 0 253 1 0 1 1 0 8 0 sigapl 424 1200 0 1149 10 2 8 9 0 8 1 futexpl 64 11260 0 11257 2 1 1 1 0 8 0 knotepl 120 317 0 0 10 0 10 10 0 8 0 kqueuepl 216 291 0 280 7 6 1 5 0 8 0 pipepl 320 335 0 306 9 5 4 8 0 8 1 fdescpl 496 1161 0 1129 5 0 5 5 0 8 0 filepl 152 8651 0 8381 25 8 17 22 0 8 5 lockfpl 104 248 0 246 1 0 1 1 0 8 0 lockfspl 48 109 0 107 1 0 1 1 0 8 0 sessionpl 144 39 0 30 1 0 1 1 0 8 0 pgrppl 48 66 0 49 1 0 1 1 0 8 0 ucredpl 104 1353 0 1340 1 0 1 1 0 8 0 zombiepl 144 1149 0 1149 1 0 1 1 0 8 1 processpl 1152 1200 0 1149 6 1 5 6 0 8 0 procpl 648 2282 0 2222 9 3 6 8 0 8 0 srpgc 96 9 0 9 2 2 0 1 0 8 0 sosppl 168 2 0 2 1 1 0 1 0 8 0 sockpl 664 2326 0 2280 24 16 8 17 0 8 3 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 231 0 0 29 0 29 29 0 8 0 mtagpl 96 11 0 0 1 0 1 1 0 8 0 mbufpl 256 1126 0 0 70 0 70 70 0 8 0 bufpl 280 5973 0 104 420 0 420 420 0 8 0 anonpl 24 228666 0 224941 60 7 53 58 0 185 19 amapchunkpl 152 30363 0 29854 36 4 32 32 0 158 11 amappl16 200 5527 0 5510 29 24 5 14 0 8 4 amappl15 192 9 0 8 1 0 1 1 0 8 0 amappl14 184 145 0 131 1 0 1 1 0 8 0 amappl13 176 7 0 6 1 0 1 1 0 8 0 amappl12 168 2034 0 2002 4 1 3 3 0 8 0 amappl11 160 63 0 49 1 0 1 1 0 8 0 amappl10 152 47 0 46 1 0 1 1 0 8 0 amappl9 144 140 0 140 1 1 0 1 0 8 0 amappl8 136 46 0 43 1 0 1 1 0 8 0 amappl7 128 156 0 143 1 0 1 1 0 8 0 amappl6 120 305 0 302 1 0 1 1 0 8 0 amappl5 112 208 0 197 1 0 1 1 0 8 0 amappl4 104 361 0 341 1 0 1 1 0 8 0 amappl3 96 6111 0 5994 4 0 4 4 0 8 0 amappl2 88 822 0 756 2 0 2 2 0 8 0 amappl1 80 10982 0 10365 15 0 15 15 0 8 0 amappl 88 8962 0 8787 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 72 100 0 2 2 0 2 2 0 8 0 uaddrrnd 24 1166 0 1132 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1166 0 1132 1 0 1 1 0 8 0 vmmpekpl 168 11934 0 11892 3 0 3 3 0 8 0 vmmpepl 168 79615 0 77699 104 11 93 99 0 357 7 vmsppl 440 1165 0 1132 6 1 5 5 0 8 0 rwobjpl 56 29089 0 24465 68 1 67 67 0 8 0 pdppl 4096 2339 0 2266 112 34 78 85 0 8 5 pvpl 32 28514 0 0 230 0 230 230 0 265 0 pmappl 248 1165 0 1132 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 484 0 63 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff83426ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 mtx_enter(ffffffff83572cd0) at mtx_enter+0xa7 sys/kern/kern_lock.c:250 wakeup_n(ffff80000002c000,1) at wakeup_n+0x54 sys/kern/kern_synch.c:540 task_add(ffff80000002c000,ffff8000001a0758) at task_add+0x167 sys/kern/kern_task.c:374 ifiq_input(ffff8000001a06f8,ffff80002a0cc8a0) at ifiq_input+0x390 sys/net/ifq.c:780 vio_rxeof(ffff8000001a0000) at vio_rxeof+0x386 sys/dev/pv/if_vio.c:1209 vio_rx_intr(ffff8000001a0050) at vio_rx_intr+0x48 sys/dev/pv/if_vio.c:1223 intr_handler(ffff80002a0cc9f0,ffff80000006c000) at intr_handler+0x11d sys/arch/amd64/amd64/intr.c:557 Xintr_ioapic_edge25_untramp() at Xintr_ioapic_edge25_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:158 mtx_enter(ffffffff83572cd0) at mtx_enter+0xa5 sys/kern/kern_lock.c:241 wakeup_n(fffffd80631d5350,ffffffff) at wakeup_n+0x54 sys/kern/kern_synch.c:540 sd_buf_done(fffffd806c06a7c8) at sd_buf_done+0x2da sys/scsi/sd.c:772 scsi_done(fffffd806c06a7c8) at scsi_done+0x40 sys/scsi/scsi_base.c:1496 vioscsi_vq_done(ffff8000000a3268) at vioscsi_vq_done+0xe1 intr_handler(ffff80002a0ccc90,ffff80000006bc00) at intr_handler+0x11d sys/arch/amd64/amd64/intr.c:557 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x78cc0c033ba0, count: -19 ddb{0}> machine ddbcpu 1 Stopped at restore_saved+0x32: xorq 0x30(%rsp),%r11 ddb{1}> trace end trace frame: 0x0, count: -1