panic: sleep: syz-executor[76240] slept inside a no-sleep walk bracket (raw pointer held across sleep, wmesg "biowait") Stopped at db_enter+0x17: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND 53613 76240 0 0 0 1 syz-executor *333414 76240 0 0 0x4000010 0K syz-executor db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84d8d160) at panic+0x270 sys/kern/subr_prf.c:198 sleep_setup(ffff800001bd7110,11,ffffffff84692f80) at sleep_setup+0x3b2 sys/kern/kern_synch.c:296 tsleep_nsec(ffff800001bd7110,11,ffffffff84692f80,ffffffffffffffff) at tsleep_nsec+0x29c sys/kern/kern_synch.c:153 biowait(ffff800001bd7110) at biowait+0xe6 sys/kern/vfs_bio.c:1110 bwrite(ffff800001bd7110) at bwrite+0x4e1 sys/kern/vfs_bio.c:625 ffs_update(ffff800001c28868,1) at ffs_update+0x619 sys/ufs/ffs/ffs_inode.c:111 ffs_truncate(ffff800001c28868,0,0,ffffffffffffffff) at ffs_truncate+0x12f0 sys/ufs/ffs/ffs_inode.c:-1 ufs_inactive(ffff80002994a920) at ufs_inactive+0x2cb sys/ufs/ufs/ufs_inode.c:84 VOP_INACTIVE(ffff800001cbf398,ffff800045ff6a80) at VOP_INACTIVE+0x1bb sys/kern/vfs_vops.c:498 vrele(ffff800001cbf398) at vrele+0x16a sys/kern/vfs_subr.c:845 ktrsettrace(ffff800045ffb038,80001104,ffff800001900c18,ffff8000001193a8) at ktrsettrace+0x16c sys/kern/kern_ktrace.c:123 ktrops(ffff800045ff6a80,ffff800045ffb038,0,80001104,ffff800001900c18,ffff8000001193a8) at ktrops+0x338 sys/kern/kern_ktrace.c:578 doktrace(ffff800001900c18,4,1104,ffffffff,ffff800045ff6a80) at doktrace+0x8c2 ktrsetchildren sys/kern/kern_ktrace.c:607 [inline] doktrace(ffff800001900c18,4,1104,ffffffff,ffff800045ff6a80) at doktrace+0x8c2 sys/kern/kern_ktrace.c:507 end trace frame: 0xffff80002994ae10, 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: sleep: syz-executor[76240] slept inside a no-sleep walk bracket (raw pointer held across sleep, wmesg "biowait") ddb{0}> show kasan kasan: no report recorded this boot ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84d8d160) at panic+0x270 sys/kern/subr_prf.c:198 sleep_setup(ffff800001bd7110,11,ffffffff84692f80) at sleep_setup+0x3b2 sys/kern/kern_synch.c:296 tsleep_nsec(ffff800001bd7110,11,ffffffff84692f80,ffffffffffffffff) at tsleep_nsec+0x29c sys/kern/kern_synch.c:153 biowait(ffff800001bd7110) at biowait+0xe6 sys/kern/vfs_bio.c:1110 bwrite(ffff800001bd7110) at bwrite+0x4e1 sys/kern/vfs_bio.c:625 ffs_update(ffff800001c28868,1) at ffs_update+0x619 sys/ufs/ffs/ffs_inode.c:111 ffs_truncate(ffff800001c28868,0,0,ffffffffffffffff) at ffs_truncate+0x12f0 sys/ufs/ffs/ffs_inode.c:-1 ufs_inactive(ffff80002994a920) at ufs_inactive+0x2cb sys/ufs/ufs/ufs_inode.c:84 VOP_INACTIVE(ffff800001cbf398,ffff800045ff6a80) at VOP_INACTIVE+0x1bb sys/kern/vfs_vops.c:498 vrele(ffff800001cbf398) at vrele+0x16a sys/kern/vfs_subr.c:845 ktrsettrace(ffff800045ffb038,80001104,ffff800001900c18,ffff8000001193a8) at ktrsettrace+0x16c sys/kern/kern_ktrace.c:123 ktrops(ffff800045ff6a80,ffff800045ffb038,0,80001104,ffff800001900c18,ffff8000001193a8) at ktrops+0x338 sys/kern/kern_ktrace.c:578 doktrace(ffff800001900c18,4,1104,ffffffff,ffff800045ff6a80) at doktrace+0x8c2 ktrsetchildren sys/kern/kern_ktrace.c:607 [inline] doktrace(ffff800001900c18,4,1104,ffffffff,ffff800045ff6a80) at doktrace+0x8c2 sys/kern/kern_ktrace.c:507 sys_ktrace(ffff800045ff6a80,ffff80002994afa0,ffff80002994af00) at sys_ktrace+0x1f6 sys/kern/kern_ktrace.c:563 syscall(ffff80002994afa0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002994afa0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5c71cac9da0, count: -17 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002994a210 rbx 0xffff80002994a280 rdx 0 rcx 0xffffffff851e9ff0 cpu_info_full_primary+0x1ff0 rax 0xffff80000015bb80 r8 0x101010101010101 r9 0x8080808080808080 r10 0xffff80002994a000 r11 0xffffffff83e54b70 x86_bus_space_io_read_1 r12 0xffffffff84d8d160 .str.9 r13 0xffffffff851eac08 cpu_info_full_primary+0x2c08 r14 0xffffffff851eae07 cpu_info_full_primary+0x2e07 r15 0x1 rip 0xffffffff82f1b577 db_enter+0x17 cs 0x8 rflags 0x246 rsp 0xffff80002994a210 ss 0x10 db_enter+0x17: popq %rbp ddb{0}> show proc PROC (syz-executor) tid=333414 pid=76240 tcnt=2 stat=onproc flags process=0 proc=4000010 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800045ff6d18,0xffffffff85deb120 process=0xffff800029915350 user=0xffff800029940000, vmspace=0xffff800001c3fd70 estcpu=13, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 76240 53613 89443 0 7 0 0 syz-executor *76240 333414 89443 0 7 0 0x4000010 syz-executor 64769 477542 41773 0 2 0 0 syz-executor 64769 159884 41773 0 3 0 0x4000080 sbwait syz-executor 92256 66240 34129 0 2 0 0 syz-executor 92256 132207 34129 0 3 0 0x4000080 fsleep syz-executor 71615 425908 89951 0 2 0 0 syz-executor 71615 353543 89951 0 3 0 0x4000080 fsleep syz-executor 73559 398125 90357 0 2 0 0 syz-executor 73559 422632 90357 0 3 0 0x4000080 fsleep syz-executor 18165 15421 81389 0 2 0 0 syz-executor 18165 338369 81389 0 3 0 0x4000080 fsleep syz-executor 60144 250243 39496 0 2 0 0 syz-executor 60144 513266 39496 0 3 0 0x4000080 fsleep syz-executor 47021 320038 43984 0 2 0 0 syz-executor 47021 446887 43984 0 3 0 0x4000080 fsleep syz-executor 47021 7553 43984 0 3 0 0x4000080 fsleep syz-executor 15138 39016 1 0 3 0x2 0x80 nanoslp getty 34129 330903 67360 0 2 0x2 0 syz-executor 89951 118450 67360 0 3 0x2 0x80 nanoslp syz-executor 81389 499670 67360 0 2 0x2 0 syz-executor 89443 15204 67360 0 3 0x2 0x80 nanoslp syz-executor 39496 92654 67360 0 2 0x2 0 syz-executor 41773 192049 67360 0 3 0x2 0x80 nanoslp syz-executor 43984 367697 67360 0 3 0x2 0x80 nanoslp syz-executor 90357 14667 67360 0 3 0x2 0x80 nanoslp syz-executor 67360 228500 1 0 3 0x2 0x80 kqread syz-executor 66159 175431 0 0 3 0x14000 0x200 bored smr 62099 290622 0 0 2 0x14000 0x200 zerothread 75530 247093 0 0 3 0x14000 0x200 aiodoned aiodoned 48206 320595 0 0 3 0x14000 0x200 syncer update 87732 210963 0 0 3 0x14000 0x200 cleaner cleaner 12320 481143 0 0 3 0x14000 0x200 reaper reaper 87297 53951 0 0 3 0x14000 0x200 pgdaemon pagedaemon 43619 51406 0 0 3 0x14000 0x200 bored viomb 50225 225665 0 0 3 0x14000 0x40000200 acpi0 acpi0 97517 157160 0 0 3 0x14000 0x40000200 idle1 90215 51195 0 0 3 0x14000 0x200 bored softnet1 44489 455446 0 0 3 0x14000 0x200 bored softnet0 91726 117864 0 0 3 0x14000 0x200 bored systqmp 20987 508839 0 0 3 0x14000 0x200 bored systq 45544 399014 0 0 3 0x14000 0x200 tmoslp softclockmp 13738 462476 0 0 3 0x14000 0x40000200 tmoslp softclock 38595 523888 0 0 3 0x14000 0x40000200 idle0 1 259749 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks Process 76240 (syz-executor) thread 0xffff800045ff6a80 (333414) exclusive rrwlock inode r = 0 (0xffff800001c28908) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xf0 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0x17e sys/kern/vfs_vops.c:527 #4 vn_lock+0xca sys/kern/vfs_vnops.c:576 #5 vrele+0x113 sys/kern/vfs_subr.c:836 #6 ktrsettrace+0x16c sys/kern/kern_ktrace.c:123 #7 ktrops+0x338 sys/kern/kern_ktrace.c:578 #8 doktrace+0x8c2 ktrsetchildren sys/kern/kern_ktrace.c:607 [inline] #8 doktrace+0x8c2 sys/kern/kern_ktrace.c:507 #9 sys_ktrace+0x1f6 sys/kern/kern_ktrace.c:563 #10 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff85d52380) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0x1048 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11041 12161K 12242K 166960K 12145 0 pcb 18 24K 24K 166960K 18 0 rtable 237 12K 13K 166960K 351 0 pf 34 22K 22K 166960K 46 0 ifaddr 43 12K 12K 166960K 45 0 ifgroup 55 2K 2K 166960K 55 0 sysctl 1 1K 13K 166960K 5 0 counters 70 42K 42K 166960K 70 0 ioctlops 0 0K 4K 166960K 1487 0 iov 1 0K 0K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 1 0K 0K 166960K 5 0 vnodes 1294 83K 83K 166960K 1369 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 6K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 3 0K 0K 166960K 3 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 292K 166960K 11964 0 file desc 17 65K 93K 166960K 148 0 proc 18 46K 193K 166960K 560 0 subproc 72 9K 9K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 in_multi 99 7K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 3 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 31 222K 222K 166960K 31 0 exec 0 0K 2K 166960K 384 0 fusefs mount 1 36K 36K 166960K 1 0 tdb 3 1K 1K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 134 128K 263K 166960K 3148 0 UVM aobj 4 4K 4K 166960K 4 0 pinsyscall 1044 1685K 1726K 166960K 1308 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 24 1K 2K 166960K 28 0 temp 34 9162K 9172K 166960K 3930 0 kqueue 1 4K 40K 166960K 26 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 33 0 33 1 0 1 1 0 8 1 rtentry 176 111 0 1 5 0 5 5 0 8 0 unpcb 144 44 0 40 1 0 1 1 0 8 0 syncache 336 4 0 4 2 1 1 1 0 8 1 tcpcb 736 9 0 8 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 69 0 67 1 0 1 1 0 8 0 nd6 152 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 pffrag 232 2 0 1 1 0 1 1 0 482 0 pffrnode 88 2 0 1 1 0 1 1 0 8 0 pffrent 40 4 0 3 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 18 0 0 1 0 1 1 0 8 0 pfstkey 128 18 0 0 1 0 1 1 0 8 0 pfstate 448 18 0 0 2 0 2 2 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 256 452 0 0 29 0 29 29 0 8 0 art_table 40 453 0 0 5 0 5 5 0 8 0 art_node 32 111 0 11 1 0 1 1 0 8 0 semapl 72 1 0 0 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1586 0 114 93 0 93 93 0 8 0 ffsino 296 1586 0 114 114 0 114 114 0 8 0 nchpl 144 1796 0 88 64 0 64 64 0 8 0 vnodes 216 1678 0 0 94 0 94 94 0 8 0 namei 1024 5516 0 5516 1 0 1 1 0 8 1 percpumem 16 51 0 0 1 0 1 1 0 8 0 kstatmem 264 27 0 0 2 0 2 2 0 8 0 scxspl 216 6686 0 6685 4 3 1 3 1 8 0 plimitpl 152 30 0 20 1 0 1 1 0 8 0 sigapl 424 466 0 430 7 0 7 7 0 8 1 knotepl 120 52 0 0 2 0 2 2 0 8 0 kqueuepl 224 28 0 23 1 0 1 1 0 8 0 pipepl 344 127 0 99 3 0 3 3 0 8 0 fdescpl 528 450 0 430 3 0 3 3 0 8 0 filepl 160 1621 0 1456 9 0 9 9 0 8 0 lockfpl 104 9 0 8 1 0 1 1 0 8 0 lockfspl 48 5 0 4 1 0 1 1 0 8 0 sessionpl 144 24 0 22 1 0 1 1 0 8 0 pgrppl 48 33 0 23 1 0 1 1 0 8 0 ucredpl 104 91 0 88 1 0 1 1 0 8 0 zombiepl 144 430 0 430 1 0 1 1 0 8 1 processpl 1232 466 0 430 5 0 5 5 0 8 1 procpl 664 491 0 446 5 0 5 5 0 8 0 sockpl 752 146 0 140 4 0 4 4 0 8 3 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mextrefs 64 26 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 180 0 0 12 0 12 12 0 8 0 bufpl 272 2353 0 105 150 0 150 150 0 8 0 anonpl 32 3882 0 0 32 0 32 32 0 222 0 amapchunkpl 152 8611 0 8239 17 0 17 17 0 158 2 amappl16 200 1979 0 1967 5 1 4 5 0 8 3 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 435 0 435 1 0 1 1 0 8 1 amappl13 176 206 0 205 1 0 1 1 0 8 0 amappl12 168 704 0 685 2 0 2 2 0 8 0 amappl11 160 25 0 25 1 1 0 1 0 8 0 amappl10 152 66 0 66 1 0 1 1 0 8 1 amappl9 144 284 0 284 1 1 0 1 0 8 0 amappl8 136 98 0 98 1 0 1 1 0 8 1 amappl7 128 152 0 150 1 0 1 1 0 8 0 amappl6 120 157 0 157 1 0 1 1 0 8 1 amappl5 112 105 0 105 1 0 1 1 0 8 1 amappl4 104 298 0 296 1 0 1 1 0 8 0 amappl3 96 1511 0 1425 3 0 3 3 0 8 0 amappl2 88 543 0 536 2 0 2 2 0 8 0 amappl1 80 10422 0 10296 14 0 14 14 0 8 5 amappl 88 2422 0 2302 4 0 4 4 0 92 0 uvmvnodes 80 98 0 0 2 0 2 2 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 450 0 430 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 450 0 430 1 0 1 1 0 8 0 vmmpekpl 168 5815 0 5785 2 0 2 2 0 8 0 vmmpepl 168 38661 0 37788 86 0 86 86 0 357 47 vmsppl 488 449 0 430 5 0 5 5 0 8 1 rwobjpl 80 14819 0 14410 25 1 24 24 0 8 3 pdppl 4096 908 0 860 96 12 84 86 0 8 36 pvpl 32 9174 0 0 74 0 74 74 0 265 0 pmappl 256 449 0 430 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 120 420 0 16 13 0 13 13 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84d8d160) at panic+0x270 sys/kern/subr_prf.c:198 sleep_setup(ffff800001bd7110,11,ffffffff84692f80) at sleep_setup+0x3b2 sys/kern/kern_synch.c:296 tsleep_nsec(ffff800001bd7110,11,ffffffff84692f80,ffffffffffffffff) at tsleep_nsec+0x29c sys/kern/kern_synch.c:153 biowait(ffff800001bd7110) at biowait+0xe6 sys/kern/vfs_bio.c:1110 bwrite(ffff800001bd7110) at bwrite+0x4e1 sys/kern/vfs_bio.c:625 ffs_update(ffff800001c28868,1) at ffs_update+0x619 sys/ufs/ffs/ffs_inode.c:111 ffs_truncate(ffff800001c28868,0,0,ffffffffffffffff) at ffs_truncate+0x12f0 sys/ufs/ffs/ffs_inode.c:-1 ufs_inactive(ffff80002994a920) at ufs_inactive+0x2cb sys/ufs/ufs/ufs_inode.c:84 VOP_INACTIVE(ffff800001cbf398,ffff800045ff6a80) at VOP_INACTIVE+0x1bb sys/kern/vfs_vops.c:498 vrele(ffff800001cbf398) at vrele+0x16a sys/kern/vfs_subr.c:845 ktrsettrace(ffff800045ffb038,80001104,ffff800001900c18,ffff8000001193a8) at ktrsettrace+0x16c sys/kern/kern_ktrace.c:123 ktrops(ffff800045ff6a80,ffff800045ffb038,0,80001104,ffff800001900c18,ffff8000001193a8) at ktrops+0x338 sys/kern/kern_ktrace.c:578 doktrace(ffff800001900c18,4,1104,ffffffff,ffff800045ff6a80) at doktrace+0x8c2 ktrsetchildren sys/kern/kern_ktrace.c:607 [inline] doktrace(ffff800001900c18,4,1104,ffffffff,ffff800045ff6a80) at doktrace+0x8c2 sys/kern/kern_ktrace.c:507 sys_ktrace(ffff800045ff6a80,ffff80002994afa0,ffff80002994af00) at sys_ktrace+0x1f6 sys/kern/kern_ktrace.c:563 syscall(ffff80002994afa0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002994afa0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5c71cac9da0, count: -17 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x19: leave x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 end of kernel end trace frame: 0x7bfa82d34ae0, count: 12 ddb{1}> trace x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 end of kernel end trace frame: 0x7bfa82d34ae0, count: -3 ddb{1}>