panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd807cea4a00+16 0x0!=0xffdd44f03a491d73 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *442040 35169 0 0 0x4000000 0K syz-executor.1 55817 63685 0 0x2 0x4000000 1 syz-fuzzer db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240bdef) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff828f7de8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828f7de8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828f7de8,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_makespace(fffffd8064161100,0,c,ffff8000218eb664) at m_makespace+0x348 m_get sys/kern/uipc_mbuf.c:250 [inline] m_makespace(fffffd8064161100,0,c,ffff8000218eb664) at m_makespace+0x348 sys/kern/uipc_mbuf.c:1176 swofp_send_error(ffff800000b33000,fffffd8064161100,0,0) at swofp_send_error+0xa7 sys/net/switchofp.c:4808 swofp_recv_hello(ffff800000b33000,fffffd8064161100) at swofp_recv_hello+0x62 sys/net/switchofp.c:4760 swofp_input(ffff800000b33000,fffffd8064161100) at swofp_input+0x1d6 sys/net/switchofp.c:4714 switchwrite(86134,ffff8000218ebac0,1) at switchwrite+0x3b0 sys/net/switchctl.c:282 spec_write(ffff8000218eb890) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd8066dee770,ffff8000218ebac0,1,fffffd807f7bf960) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:268 vn_write(fffffd8067bd5280,ffff8000218ebac0,1) at vn_write+0x198 sys/kern/vfs_vnops.c:414 dofilewritev(ffff800023f73178,3,ffff8000218ebac0,1,ffff8000218ebbb0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_pwritev(ffff800023f73178,ffff8000218ebb68,ffff8000218ebbb0) at sys_pwritev+0xb8 sys/kern/vfs_syscalls.c:3338 end trace frame: 0xffff8000218ebc20, 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 pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd807cea4a00+16 0x0!=0xffdd44f03a491d73 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240bdef) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff828f7de8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828f7de8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828f7de8,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_makespace(fffffd8064161100,0,c,ffff8000218eb664) at m_makespace+0x348 m_get sys/kern/uipc_mbuf.c:250 [inline] m_makespace(fffffd8064161100,0,c,ffff8000218eb664) at m_makespace+0x348 sys/kern/uipc_mbuf.c:1176 swofp_send_error(ffff800000b33000,fffffd8064161100,0,0) at swofp_send_error+0xa7 sys/net/switchofp.c:4808 swofp_recv_hello(ffff800000b33000,fffffd8064161100) at swofp_recv_hello+0x62 sys/net/switchofp.c:4760 swofp_input(ffff800000b33000,fffffd8064161100) at swofp_input+0x1d6 sys/net/switchofp.c:4714 switchwrite(86134,ffff8000218ebac0,1) at switchwrite+0x3b0 sys/net/switchctl.c:282 spec_write(ffff8000218eb890) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd8066dee770,ffff8000218ebac0,1,fffffd807f7bf960) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:268 vn_write(fffffd8067bd5280,ffff8000218ebac0,1) at vn_write+0x198 sys/kern/vfs_vnops.c:414 dofilewritev(ffff800023f73178,3,ffff8000218ebac0,1,ffff8000218ebbb0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_pwritev(ffff800023f73178,ffff8000218ebb68,ffff8000218ebbb0) at sys_pwritev+0xb8 sys/kern/vfs_syscalls.c:3338 syscall(ffff8000218ebc30) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000218ebc30) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xec34adcdf30, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000218eb3d0 rbx 0xffff8000218eb480 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffff8000218eb390 r9 0xffffffff81c9883f kprintf+0x16f r10 0x1 r11 0x95bd7e327afd4b1d r12 0x3000000008 r13 0xffff8000218eb3e0 r14 0x100 r15 0x1 rip 0xffffffff81c6ddc8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000218eb3c0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=442040 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800023f738e0,0xffffffff828ed090 process=0xffff80002412a008 user=0xffff8000218e6000, vmspace=0xfffffd807efff730 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 35169 207442 49427 0 2 0 syz-executor.1 *35169 442040 49427 0 7 0x4000000 syz-executor.1 62911 343739 0 0 3 0x14200 acct acct 37451 174658 0 0 3 0x14280 nfsidl nfsio 94310 295066 0 0 3 0x14280 nfsidl nfsio 87400 394467 0 0 3 0x14280 nfsidl nfsio 53222 235308 0 0 3 0x14280 nfsidl nfsio 72471 101617 0 0 3 0x14280 nfsidl nfsio 75512 512516 0 0 3 0x14280 nfsidl nfsio 91541 154944 0 0 3 0x14280 nfsidl nfsio 62517 188827 0 0 3 0x14280 nfsidl nfsio 72532 227681 0 0 3 0x14280 nfsidl nfsio 1766 346846 0 0 3 0x14280 nfsidl nfsio 73748 76676 0 0 3 0x14280 nfsidl nfsio 75460 36909 0 0 3 0x14280 nfsidl nfsio 19490 408211 0 0 3 0x14280 nfsidl nfsio 25057 330169 0 0 3 0x14280 nfsidl nfsio 46695 132791 0 0 3 0x14280 nfsidl nfsio 97651 455632 0 0 3 0x14280 nfsidl nfsio 44980 85948 0 0 3 0x14280 nfsidl nfsio 16134 478198 0 0 3 0x14280 nfsidl nfsio 12593 291817 0 0 3 0x14280 nfsidl nfsio 62967 336122 0 0 3 0x14280 nfsidl nfsio 49427 506322 63685 0 3 0x82 nanosleep syz-executor.1 61564 250367 0 0 3 0x14200 bored sosplice 3253 157588 63685 0 3 0x82 piperd syz-executor.0 63685 46451 14668 0 3 0x82 kqread syz-fuzzer 63685 229540 14668 0 3 0x4000082 nanosleep syz-fuzzer 63685 296098 14668 0 3 0x4000082 thrsleep syz-fuzzer 63685 55817 14668 0 7 0x4000002 syz-fuzzer 63685 300039 14668 0 3 0x4000082 thrsleep syz-fuzzer 63685 45459 14668 0 3 0x4000082 thrsleep syz-fuzzer 63685 2837 14668 0 3 0x4000082 thrsleep syz-fuzzer 63685 186116 14668 0 3 0x4000082 thrsleep syz-fuzzer 14668 317224 81562 0 3 0x10008a pause ksh 81562 170551 81548 0 3 0x92 select sshd 18259 254996 1 0 3 0x100083 ttyin getty 81548 514400 1 0 3 0x80 select sshd 43412 365287 16620 74 3 0x100092 bpf pflogd 16620 71800 1 0 3 0x80 netio pflogd 86742 453742 20977 73 3 0x100090 kqread syslogd 20977 63815 1 0 3 0x100082 netio syslogd 89581 80059 1 77 3 0x100090 poll dhclient 74213 405400 1 0 3 0x80 poll dhclient 12163 203701 0 0 3 0x14200 bored smr 99834 200444 0 0 2 0x14200 zerothread 27971 160422 0 0 3 0x14200 aiodoned aiodoned 87725 522044 0 0 3 0x14200 syncer update 85280 223061 0 0 3 0x14200 cleaner cleaner 61255 1466 0 0 3 0x14200 reaper reaper 26205 406509 0 0 3 0x14200 pgdaemon pagedaemon 33262 383391 0 0 3 0x14200 bored crynlk 36406 62232 0 0 3 0x14200 bored crypto 38702 330675 0 0 3 0x40014200 acpi0 acpi0 8117 471736 0 0 3 0x40014200 idle1 46963 95228 0 0 3 0x14200 bored softnet 32000 159333 0 0 3 0x14200 bored systqmp 87548 413982 0 0 3 0x14200 bored systq 69530 387842 0 0 3 0x40014200 bored softclock 19694 40813 0 0 3 0x40014200 idle0 1 459205 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 35169 (syz-executor.1) thread 0xffff800023f73178 (442040) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828c5c88) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 vn_write+0x42 sys/kern/vfs_vnops.c:399 #2 dofilewritev+0x1b6 sys/kern/sys_generic.c:365 #3 sys_pwritev+0xb8 sys/kern/vfs_syscalls.c:3338 #4 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #4 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #5 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9549 6444K 6917K 78643K 11706 0 pcb 13 8K 8K 78643K 100 0 rtable 130 8K 8K 78643K 505 0 ifaddr 100 18K 19K 78643K 209 0 sysctl 2 0K 0K 78643K 2 0 counters 43 33K 34K 78643K 71 0 ioctlops 0 0K 4K 78643K 1594 0 iov 0 0K 16K 78643K 76 0 mount 1 1K 1K 78643K 1 0 vnodes 1222 77K 77K 78643K 1568 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 15 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 83 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 5 13K 25K 78643K 852 0 sigio 0 0K 0K 78643K 18 0 proc 61 63K 95K 78643K 589 0 subproc 32 2K 2K 78643K 68 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 45 0 in_multi 68 3K 3K 78643K 163 0 ether_multi 1 0K 0K 78643K 15 0 mrt 0 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 1K 78643K 302 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 173 60K 61K 78643K 3507 0 UVM aobj 31 6K 6K 78643K 39 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 88 0 NDP 17 0K 0K 78643K 49 0 temp 149 3877K 3974K 78643K 15112 0 kqueue 3 4K 8K 78643K 22 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 arp 64 10 0 4 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 88 39 0 37 1 0 1 1 0 8 0 rtentry 112 90 0 43 2 0 2 2 0 8 0 unpcb 120 471 0 459 1 0 1 1 0 8 0 syncache 272 6 0 6 2 2 0 1 0 8 0 tcpqe 32 389 0 389 1 1 0 1 0 8 0 tcpcb 592 150 0 144 3 2 1 2 0 8 0 inpcb 296 1624 0 1617 4 2 2 2 0 8 1 nd6 48 30 0 22 1 0 1 1 0 8 0 pkpcb 40 12 0 12 2 2 0 1 0 8 0 pffrag 232 2 0 2 1 1 0 1 0 482 0 pffrnode 88 2 0 2 1 1 0 1 0 8 0 pffrent 40 49 0 49 1 1 0 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfrktable 1344 34 0 25 2 1 1 1 0 8 0 pftag 88 4 0 4 1 1 0 1 0 8 0 pfstitem 24 29 0 21 1 0 1 1 0 8 0 pfstkey 112 31 0 23 1 0 1 1 0 8 0 pfstate 328 29 0 22 3 1 2 3 0 8 0 pfrule 1360 38 0 29 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 419 0 221 20 7 13 18 0 8 0 art_table 32 420 0 221 3 1 2 3 0 8 0 art_node 16 89 0 47 1 0 1 1 0 8 0 sysvmsgpl 40 29 0 22 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 77 0 67 1 0 1 1 0 8 0 shmpl 112 36 0 8 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2444 0 1037 90 1 89 89 0 8 0 ffsino 272 2444 0 1037 97 2 95 95 0 8 1 nchpl 144 3805 0 2221 60 0 60 60 0 8 0 uvmvnodes 72 2752 0 0 51 0 51 51 0 8 0 vnodes 208 2752 0 0 145 0 145 145 0 8 0 namei 1024 10489 0 10489 3 2 1 1 0 8 1 percpumem 16 46 0 14 1 0 1 1 0 8 0 vcpupl 1984 3 0 0 1 0 1 1 0 8 0 vmpool 560 7 0 4 1 0 1 1 0 8 0 pfiaddrpl 120 10 0 6 2 1 1 1 0 8 0 scxspl 200 11139 0 11139 13 12 1 6 0 8 1 plimitpl 152 66 0 58 1 0 1 1 0 8 0 sigapl 424 1083 0 1030 6 0 6 6 0 8 0 futexpl 56 13181 0 13181 2 1 1 1 0 8 1 knotepl 112 106 0 86 1 0 1 1 0 8 0 kqueuepl 152 81 0 76 1 0 1 1 0 8 0 pipepl 304 176 0 165 3 1 2 2 0 8 0 fdescpl 496 1046 0 1030 3 0 3 3 0 8 0 filepl 152 5943 0 5838 6 1 5 5 0 8 0 lockfpl 104 157 0 156 1 0 1 1 0 8 0 lockfspl 48 47 0 46 1 0 1 1 0 8 0 sessionpl 120 20 0 9 1 0 1 1 0 8 0 pgrppl 48 34 0 23 1 0 1 1 0 8 0 ucredpl 96 530 0 521 1 0 1 1 0 8 0 zombiepl 144 1030 0 1030 2 1 1 1 0 8 1 processpl 1008 1083 0 1030 8 1 7 7 0 8 0 procpl 632 2603 0 2542 7 1 6 6 0 8 0 sosppl 144 8 0 8 4 3 1 1 0 8 1 sockpl 400 2150 0 2129 8 4 4 4 0 8 1 mcl64k 65536 12 0 0 2 0 2 2 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 204 0 0 24 0 24 24 0 8 1 mtagpl 96 23 0 0 1 0 1 1 0 8 0 mbufpl 256 475 0 0 26 0 26 26 0 8 1 bufpl 280 4841 0 131 337 0 337 337 0 8 0 anonpl 16 115020 0 96446 95 18 77 91 0 124 2 amapchunkpl 152 5967 0 5639 28 14 14 27 0 158 0 amappl16 192 3941 0 3099 58 15 43 55 0 8 0 amappl15 184 67 0 64 1 0 1 1 0 8 0 amappl14 176 687 0 684 1 0 1 1 0 8 0 amappl13 168 42 0 39 1 0 1 1 0 8 0 amappl12 160 25 0 23 1 0 1 1 0 8 0 amappl11 152 748 0 730 1 0 1 1 0 8 0 amappl10 144 17 0 13 1 0 1 1 0 8 0 amappl9 136 368 0 366 1 0 1 1 0 8 0 amappl8 128 396 0 354 2 0 2 2 0 8 0 amappl7 120 137 0 125 1 0 1 1 0 8 0 amappl6 112 455 0 445 1 0 1 1 0 8 0 amappl5 104 248 0 232 1 0 1 1 0 8 0 amappl4 96 1200 0 1171 1 0 1 1 0 8 0 amappl3 88 421 0 413 1 0 1 1 0 8 0 amappl2 80 7358 0 7289 2 0 2 2 0 8 0 amappl1 72 39049 0 38601 23 13 10 18 0 8 0 amappl 80 2914 0 2825 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 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 38 0 8 1 0 1 1 0 8 0 uaddrrnd 24 1053 0 1034 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1053 0 1034 1 0 1 1 0 8 0 vmmpekpl 168 10589 0 10554 2 0 2 2 0 8 0 vmmpepl 168 139404 0 137338 164 72 92 122 0 357 0 vmsppl 368 1052 0 1034 2 0 2 2 0 8 0 pdppl 4096 2113 0 2071 7 1 6 6 0 8 0 pvpl 32 356154 0 334240 225 25 200 214 0 265 23 pmappl 232 1052 0 1034 4 2 2 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 294 0 22 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240bdef) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff828f7de8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828f7de8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828f7de8,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_makespace(fffffd8064161100,0,c,ffff8000218eb664) at m_makespace+0x348 m_get sys/kern/uipc_mbuf.c:250 [inline] m_makespace(fffffd8064161100,0,c,ffff8000218eb664) at m_makespace+0x348 sys/kern/uipc_mbuf.c:1176 swofp_send_error(ffff800000b33000,fffffd8064161100,0,0) at swofp_send_error+0xa7 sys/net/switchofp.c:4808 swofp_recv_hello(ffff800000b33000,fffffd8064161100) at swofp_recv_hello+0x62 sys/net/switchofp.c:4760 swofp_input(ffff800000b33000,fffffd8064161100) at swofp_input+0x1d6 sys/net/switchofp.c:4714 switchwrite(86134,ffff8000218ebac0,1) at switchwrite+0x3b0 sys/net/switchctl.c:282 spec_write(ffff8000218eb890) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd8066dee770,ffff8000218ebac0,1,fffffd807f7bf960) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:268 vn_write(fffffd8067bd5280,ffff8000218ebac0,1) at vn_write+0x198 sys/kern/vfs_vnops.c:414 dofilewritev(ffff800023f73178,3,ffff8000218ebac0,1,ffff8000218ebbb0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_pwritev(ffff800023f73178,ffff8000218ebb68,ffff8000218ebbb0) at sys_pwritev+0xb8 sys/kern/vfs_syscalls.c:3338 syscall(ffff8000218ebc30) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000218ebc30) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xec34adcdf30, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020d70ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 end of kernel end trace frame: 0xc000cfee00, count: 12 ddb{1}> trace x86_ipi_db(ffff800020d70ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 end of kernel end trace frame: 0xc000cfee00, count: -3