kern.securelevel: 0 -> 1 creating runtime link editor directory cache. preserving editor files. starting network daemons: sshd. starting local daemons:. Tue Aug 31 21:09:05 PDT 2021 OpenBSD/amd64 (ci-openbsd-multicore-3.c.syzkaller.internal) (tty00) Warning: Permanently added '10.128.0.230' (ED25519) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program login: panic: acquiring blockable sleep lock with spinlock or critical section held (kernel_lock) &kernel_lock Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 409905 85272 0 0 0 1 syz-executor1189 * 11849 85272 0 0 0x4000000 0 syz-executor1189 db_enter() at db_enter+0x18 panic(ffffffff82464b8f) at panic+0x177 witness_checkorder(ffffffff82838c20,9,0) at witness_checkorder+0x11eb __mp_lock(ffffffff82838a18) at __mp_lock+0xa1 intr_handler(ffff800021302d20,ffff80000006a400) at intr_handler+0x5e Xintr_ioapic_edge17_untramp() at Xintr_ioapic_edge17_untramp+0x18f Xspllower() at Xspllower+0x19 mtx_enter_try(ffffffff829e4270) at mtx_enter_try+0x100 mtx_enter(ffffffff829e4270) at mtx_enter+0x4b pool_get(ffffffff829e4270,9) at pool_get+0xbf uvmspace_alloc(0,200000,1,0) at uvmspace_alloc+0x3d vm_impl_init_vmx(ffff8000213e1888,ffff8000ffff6fd0) at vm_impl_init_vmx+0x71 vm_create(ffff800000b22800,ffff8000ffff6fd0) at vm_create+0x19b vmmioctl(a00,c5005601,ffff800000b22800,1,ffff8000ffff6fd0) at vmmioctl+0x1f2 end trace frame: 0xffff8000213031b0, count: 0 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: acquiring blockable sleep lock with spinlock or critical section held (kernel_lock) &kernel_lock ddb{0}> trace db_enter() at db_enter+0x18 panic(ffffffff82464b8f) at panic+0x177 witness_checkorder(ffffffff82838c20,9,0) at witness_checkorder+0x11eb __mp_lock(ffffffff82838a18) at __mp_lock+0xa1 intr_handler(ffff800021302d20,ffff80000006a400) at intr_handler+0x5e Xintr_ioapic_edge17_untramp() at Xintr_ioapic_edge17_untramp+0x18f Xspllower() at Xspllower+0x19 mtx_enter_try(ffffffff829e4270) at mtx_enter_try+0x100 mtx_enter(ffffffff829e4270) at mtx_enter+0x4b pool_get(ffffffff829e4270,9) at pool_get+0xbf uvmspace_alloc(0,200000,1,0) at uvmspace_alloc+0x3d vm_impl_init_vmx(ffff8000213e1888,ffff8000ffff6fd0) at vm_impl_init_vmx+0x71 vm_create(ffff800000b22800,ffff8000ffff6fd0) at vm_create+0x19b vmmioctl(a00,c5005601,ffff800000b22800,1,ffff8000ffff6fd0) at vmmioctl+0x1f2 VOP_IOCTL(fffffd807058b210,c5005601,ffff800000b22800,1,fffffd807f7d89c0,ffff8000ffff6fd0) at VOP_IOCTL+0x9a vn_ioctl(fffffd806e3d33a0,c5005601,ffff800000b22800,ffff8000ffff6fd0) at vn_ioctl+0xba sys_ioctl(ffff8000ffff6fd0,ffff8000213033e8,ffff800021303430) at sys_ioctl+0x4a2 syscall(ffff8000213034b0) at syscall+0x5a9 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x69c30412be0, count: -19 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800021302b10 rbx 0xffffffff8280abff cpu_info_full_primary+0x2bff rdx 0x8b rcx 0x2 rax 0x68 r8 0xffffffff81a0be34 kprintf+0x144 r9 0x1 r10 0x85d98e5a9beaed72 r11 0x75dae88b1d1dc84d r12 0xffffffff8280aa00 cpu_info_full_primary+0x2a00 r13 0 r14 0 r15 0x1 rip 0xffffffff81e3e908 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021302b00 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor1189) pid=11849 stat=onproc flags process=0 proc=4000000 pri=17, usrpri=66, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff62b0,0xffffffff82913618 process=0xffff80002120a9f0 user=0xffff8000212fe000, vmspace=0xfffffd806b428e80 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=1 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 85272 409905 98073 0 7 0 syz-executor1189 *85272 11849 98073 0 7 0x4000000 syz-executor1189 98073 509691 17932 0 3 0x80 nanoslp syz-executor1189 6590 77678 17932 0 3 0 biowait syz-executor1189 17932 330554 84730 0 3 0x82 nanoslp syz-executor1189 84730 104856 17470 0 3 0x10008a sigsusp ksh 17470 403772 95321 0 3 0x9a select sshd 14774 70811 1 0 3 0x100083 ttyin getty 95321 457380 1 0 3 0x88 select sshd 76341 210687 60992 74 3 0x100092 bpf pflogd 60992 437587 1 0 3 0x80 netio pflogd 57930 71267 75163 73 3 0x100090 kqread syslogd 75163 251624 1 0 3 0x100082 netio syslogd 81458 348823 1 0 3 0x100080 kqread resolvd 43085 163033 70478 77 3 0x100092 kqread dhcpleased 61391 143226 70478 77 3 0x100092 kqread dhcpleased 70478 473062 1 0 3 0x80 kqread dhcpleased 1955 385938 0 0 3 0x14200 bored smr 25977 165474 0 0 3 0x14200 pgzero zerothread 69991 94236 0 0 3 0x14200 aiodoned aiodoned 8260 403557 0 0 3 0x14200 syncer update 7605 308690 0 0 3 0x14200 cleaner cleaner 69222 153132 0 0 3 0x14200 reaper reaper 91637 243970 0 0 3 0x14200 pgdaemon pagedaemon 98867 449183 0 0 3 0x14200 bored crynlk 18770 248580 0 0 3 0x14200 bored crypto 22744 2389 0 0 3 0x14200 bored viomb 24390 382376 0 0 3 0x40014200 acpi0 acpi0 83379 196495 0 0 3 0x40014200 idle1 12924 467848 0 0 3 0x14200 bored softnet 88076 489141 0 0 3 0x14200 bored systqmp 39537 186333 0 0 3 0x14200 bored systq 48979 115832 0 0 3 0x40014200 bored softclock 73739 41697 0 0 3 0x40014200 idle0 1 337710 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex vmsppl r = 0 (0xffffffff829e4280) #0 witness_lock+0x4b0 #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b #3 pool_get+0xbf #4 uvmspace_alloc+0x3d #5 vm_impl_init_vmx+0x71 #6 vm_create+0x19b #7 vmmioctl+0x1f2 #8 VOP_IOCTL+0x9a #9 vn_ioctl+0xba #10 sys_ioctl+0x4a2 #11 syscall+0x5a9 #12 Xsyscall+0x128 Process 85272 (syz-executor1189) thread 0xffff8000ffff6fd0 (11849) exclusive rwlock vmlistlock r = 0 (0xffff800000655c78) #0 witness_lock+0x4b0 #1 vm_create+0x12e #2 vmmioctl+0x1f2 #3 VOP_IOCTL+0x9a #4 vn_ioctl+0xba #5 sys_ioctl+0x4a2 #6 syscall+0x5a9 #7 Xsyscall+0x128 exclusive mutex vmsppl r = 0 (0xffffffff829e4280) #0 witness_lock+0x4b0 #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b #3 pool_get+0xbf #4 uvmspace_alloc+0x3d #5 vm_impl_init_vmx+0x71 #6 vm_create+0x19b #7 vmmioctl+0x1f2 #8 VOP_IOCTL+0x9a #9 vn_ioctl+0xba #10 sys_ioctl+0x4a2 #11 syscall+0x5a9 #12 Xsyscall+0x128 Process 6590 (syz-executor1189) thread 0xffff80002121e540 (77678) exclusive rrwlock inode r = 0 (0xfffffd806d8f0f78) #0 witness_lock+0x4b0 #1 rw_enter+0x3e2 #2 rrw_enter+0x8b #3 VOP_LOCK+0x87 #4 vn_lock+0x84 #5 vget+0x1eb #6 ufs_ihashget+0x121 #7 ffs_vget+0x7c #8 ufs_lookup+0x145f #9 VOP_LOOKUP+0x5b #10 vfs_lookup+0x737 #11 namei+0x55a #12 dounlinkat+0x99 #13 syscall+0x5a9 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd807028b708) #0 witness_lock+0x4b0 #1 rw_enter+0x3e2 #2 rrw_enter+0x8b #3 VOP_LOCK+0x87 #4 vn_lock+0x84 #5 vfs_lookup+0xdd #6 namei+0x55a #7 dounlinkat+0x99 #8 syscall+0x5a9 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10111 6416K 6417K 78643K 11201 0 pcb 13 8K 8K 78643K 13 0 rtable 62 2K 2K 78643K 112 0 ifaddr 29 8K 8K 78643K 30 0 counters 40 33K 33K 78643K 40 0 ioctlops 1 2K 4K 78643K 2124 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 6 0 vnodes 1183 74K 75K 78643K 1188 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 1 0K 0K 78643K 1 0 proc 67 87K 87K 78643K 278 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 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 19 95K 95K 78643K 19 0 exec 0 0K 2K 78643K 348 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 1392 10469K 10469K 78643K 10144 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 4 0K 0K 78643K 4 0 temp 23 4193K 4257K 78643K 3252 0 kqueue 9 12K 12K 78643K 9 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> 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 17 0 14 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 120 35 0 20 1 0 1 1 0 8 0 syncache 296 5 0 5 2 2 0 1 0 8 0 tcpcb 736 8 0 5 1 0 1 1 0 8 0 arp 120 2 0 0 1 0 1 1 0 8 0 inpcb 304 32 0 26 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 pfstitem 24 9 0 2 1 0 1 1 0 8 0 pfstkey 112 9 0 2 1 0 1 1 0 8 0 pfstate 320 9 0 2 1 0 1 1 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2705 0 1310 88 0 88 88 0 8 0 ffsino 272 2705 0 1310 94 0 94 94 0 8 0 nchpl 144 4169 0 2616 58 0 58 58 0 8 0 uvmvnodes 72 2715 0 0 50 0 50 50 0 8 0 vnodes 224 2715 0 0 160 0 160 160 0 8 0 namei 1024 9308 0 9308 2 1 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 vcpupl 2048 644 0 0 81 0 81 81 0 8 0 vmpool 560 645 0 0 47 0 47 47 0 8 0 scxspl 216 9507 0 9506 11 10 1 8 0 8 0 plimitpl 152 16 0 9 1 0 1 1 0 8 0 sigapl 424 902 0 868 5 0 5 5 0 8 0 futexpl 56 761 0 761 1 0 1 1 0 8 1 knotepl 112 23 0 0 1 0 1 1 0 8 0 kqueuepl 216 5 0 0 1 0 1 1 0 8 0 pipepl 336 69 0 66 2 1 1 1 0 8 0 fdescpl 496 886 0 868 3 0 3 3 0 8 0 filepl 152 3018 0 2958 3 0 3 3 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 18 0 9 1 0 1 1 0 8 0 pgrppl 48 18 0 9 1 0 1 1 0 8 0 ucredpl 96 69 0 57 1 0 1 1 0 8 0 zombiepl 144 868 0 868 2 1 1 1 0 8 1 processpl 1072 902 0 868 3 0 3 3 0 8 0 procpl 672 1561 0 1526 4 0 4 4 0 8 0 sockpl 480 84 0 60 5 1 4 4 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 78 0 0 9 0 9 9 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 128 0 0 8 0 8 8 0 8 0 bufpl 280 2671 0 91 185 0 185 185 0 8 0 anonpl 24 149103 0 145747 25 4 21 21 0 186 0 amapchunkpl 152 18985 0 18796 10 1 9 9 0 158 1 amappl16 200 742 0 92 35 0 35 35 0 8 0 amappl13 176 18 0 17 2 1 1 1 0 8 0 amappl12 168 15 0 15 1 1 0 1 0 8 0 amappl11 160 58 0 44 1 0 1 1 0 8 0 amappl10 152 42 0 37 1 0 1 1 0 8 0 amappl9 144 228 0 226 1 0 1 1 0 8 0 amappl8 136 331 0 328 2 1 1 1 0 8 0 amappl7 128 52 0 45 1 0 1 1 0 8 0 amappl6 120 88 0 83 1 0 1 1 0 8 0 amappl5 112 209 0 193 1 0 1 1 0 8 0 amappl4 104 1169 0 1146 1 0 1 1 0 8 0 amappl3 96 690 0 686 1 0 1 1 0 8 0 amappl2 88 420 0 375 3 1 2 2 0 8 0 amappl1 80 15917 0 15519 11 2 9 9 0 8 0 amappl 88 9248 0 8519 18 1 17 17 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 64 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1530 0 868 4 0 4 4 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1530 0 868 4 0 4 4 0 8 0 vmmpekpl 168 7585 0 7564 2 0 2 2 0 8 1 vmmpepl 168 66257 0 64001 103 4 99 99 0 357 0 vmsppl 368 1529 0 868 61 0 61 61 0 8 0 rwobjpl 56 17119 0 15252 29 2 27 27 0 8 0 pdppl 4096 3068 0 2380 711 22 689 689 0 8 1 pvpl 32 291840 0 287073 45 4 41 41 0 265 2 pmappl 224 1529 0 868 39 0 39 39 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 1074 0 27 30 0 30 30 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 panic(ffffffff82464b8f) at panic+0x177 witness_checkorder(ffffffff82838c20,9,0) at witness_checkorder+0x11eb __mp_lock(ffffffff82838a18) at __mp_lock+0xa1 intr_handler(ffff800021302d20,ffff80000006a400) at intr_handler+0x5e Xintr_ioapic_edge17_untramp() at Xintr_ioapic_edge17_untramp+0x18f Xspllower() at Xspllower+0x19 mtx_enter_try(ffffffff829e4270) at mtx_enter_try+0x100 mtx_enter(ffffffff829e4270) at mtx_enter+0x4b pool_get(ffffffff829e4270,9) at pool_get+0xbf uvmspace_alloc(0,200000,1,0) at uvmspace_alloc+0x3d vm_impl_init_vmx(ffff8000213e1888,ffff8000ffff6fd0) at vm_impl_init_vmx+0x71 vm_create(ffff800000b22800,ffff8000ffff6fd0) at vm_create+0x19b vmmioctl(a00,c5005601,ffff800000b22800,1,ffff8000ffff6fd0) at vmmioctl+0x1f2 VOP_IOCTL(fffffd807058b210,c5005601,ffff800000b22800,1,fffffd807f7d89c0,ffff8000ffff6fd0) at VOP_IOCTL+0x9a vn_ioctl(fffffd806e3d33a0,c5005601,ffff800000b22800,ffff8000ffff6fd0) at vn_ioctl+0xba sys_ioctl(ffff8000ffff6fd0,ffff8000213033e8,ffff800021303430) at sys_ioctl+0x4a2 syscall(ffff8000213034b0) at syscall+0x5a9 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x69c30412be0, count: -19 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a x86_ipi_handler() at x86_ipi_handler+0xb7 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 end of kernel end trace frame: 0x7f7ffffbb7f0, count: 12 ddb{1}> trace x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a x86_ipi_handler() at x86_ipi_handler+0xb7 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 end of kernel end trace frame: 0x7f7ffffbb7f0, count: -3 ddb{1}>