witness: lock order reversal: 1st 0xffff8000014e7418 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd805de267e8 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff834013ba -> 0xffffffff833759dd is missing lock order [2] inode (&ip->i_lock) -> [3] sbufrcv (&so->so_rcv.sb_lock) #0 rw_do_enter_write+186 #1 sblock+182 #2 soreceive+637 #3 fifo_read+279 #4 VOP_READ+257 #5 vn_rdwr+347 #6 vndsetcred+161 #7 vndioctl+3577 #8 VOP_IOCTL+172 #9 vn_ioctl+248 #10 sys_ioctl+1652 #11 syscall+3028 #12 Xsyscall+296 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] sbufsnd (&so->so_snd.sb_lock) #0 rw_do_enter_write+186 #1 sblock+182 #2 sosplice+786 #3 sys_setsockopt+698 #4 syscall+3028 #5 Xsyscall+296 Stopped at db_enter+37: addq $8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+37 witness_checkorder(fffffd805de267e8,9,0) at witness_checkorder+4305 rw_do_enter_write(fffffd805de267d0,1) at rw_do_enter_write+186 rrw_enter(fffffd805de267d0,1) at rrw_enter+198 VOP_LOCK(fffffd806be836d8,2001) at VOP_LOCK+189 vn_lock(fffffd806be836d8,2001) at vn_lock+164 vfs_lookup(ffff80002a2f9b40) at vfs_lookup+284 namei(ffff80002a2f9b40) at namei+1994 unp_connect(ffff8000014e7230,fffffd806caace00,ffff8000387ecd48) at unp_connect+669 uipc_dgram_send(ffff8000014e7230,fffffd806ae4de00,fffffd806caace00,0) at uipc_dgram_send+355 sosend(ffff8000014e7230,fffffd806caace00,ffff80002a2f9dc8,0,0,e) at sosend+2052 sendit(ffff8000387ecd48,5,ffff80002a2f9f48,e,ffff80002a2fa000) at sendit+1445 sys_sendmsg(ffff8000387ecd48,ffff80002a2fa0b0,ffff80002a2fa000) at sys_sendmsg+582 syscall(ffff80002a2fa0b0) at syscall+3028 Xsyscall() at Xsyscall+296 end of kernel end trace frame: 0xe9e61142740, count: -15 ddb{1}> show registers rdi 0 rsi 524288 acpi_pdirpa+441969 rbp 18446603336928958384 rbx 0 rdx 18446603336242502592 rcx 18446603337169030472 rax 524287 acpi_pdirpa+441968 r8 18446603336928958096 r9 9259542123273814144 r10 13434182338751529807 r11 8490401008558648327 r12 18446741324996810880 r13 18446741325005104616 r14 3 r15 18446744071616638478 substchar+16306 rip 18446744071611361365 db_enter+37 cs 8 rflags 582 rsp 18446603336928958368 ss 16 db_enter+37: addq $8,%rsp ddb{1}> show proc PROC (syz-executor) tid=309920 pid=43551 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000387ec818,0xffff80003c447270 process=0xffff80003c5321e8 user=0xffff80002a2f5000, vmspace=0xfffffd800b0631e8 estcpu=33, cpticks=1, pctcpu=0.1, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 51290 86303 79249 0 7 0 syz-executor 51290 232088 79249 0 2 0x4000000 syz-executor 43551 94338 89521 0 2 0 syz-executor *43551 309920 89521 0 7 0x4000000 syz-executor 1289 497631 31848 0 2 0 syz-executor 1289 507649 31848 0 2 0x4000000 syz-executor 1289 185186 31848 0 3 0x4000080 fsleep syz-executor 42272 470994 10871 0 2 0 syz-executor 42272 315836 10871 0 2 0x4000000 syz-executor 42272 191598 10871 0 3 0x4000080 fsleep syz-executor 43133 53024 36642 0 3 0x82 nanoslp syz-executor 47217 328073 0 0 3 0x14280 nfsidl nfsio 60861 439484 0 0 3 0x14280 nfsidl nfsio 47416 266280 0 0 3 0x14280 nfsidl nfsio 18129 197279 0 0 3 0x14280 nfsidl nfsio 77043 304819 0 0 3 0x14280 nfsidl nfsio 34250 366458 0 0 3 0x14280 nfsidl nfsio 65581 225607 0 0 3 0x14280 nfsidl nfsio 90140 495873 0 0 3 0x14280 nfsidl nfsio 45390 475275 0 0 3 0x14280 nfsidl nfsio 61684 325112 0 0 3 0x14280 nfsidl nfsio 25686 411579 0 0 3 0x14280 nfsidl nfsio 32048 188861 0 0 3 0x14280 nfsidl nfsio 87741 457731 0 0 3 0x14280 nfsidl nfsio 977 358535 0 0 3 0x14280 nfsidl nfsio 97573 61850 0 0 3 0x14280 nfsidl nfsio 19204 13054 0 0 3 0x14280 nfsidl nfsio 412 244686 0 0 3 0x14280 nfsidl nfsio 74800 366848 0 0 3 0x14280 nfsidl nfsio 63449 220147 0 0 3 0x14280 nfsidl nfsio 57044 129514 0 0 3 0x14280 nfsidl nfsio 89521 94473 36642 0 3 0x82 nanoslp syz-executor 80091 319397 36642 0 3 0x2 biowait syz-executor 31848 67418 36642 0 3 0x82 nanoslp syz-executor 10871 250134 36642 0 3 0x82 nanoslp syz-executor 75703 467080 1 0 3 0x100083 ttyopn getty 43374 463096 36642 0 3 0x2 biowait syz-executor 79249 331189 36642 0 3 0x82 nanoslp syz-executor 2807 14976 36642 0 3 0x2 biowait syz-executor 36642 474860 62842 0 3 0x82 kqread syz-executor 62842 163364 30613 0 3 0x10008a sigsusp ksh 30613 348676 90240 0 3 0x98 kqread sshd-session 90240 478771 12153 0 3 0x92 kqread sshd-session 12153 95274 1 0 3 0x88 kqread sshd 76910 186988 21414 74 3 0x1100092 bpf pflogd 21414 481368 1 0 3 0x80 sbwait pflogd 47254 58029 85630 73 3 0x1100090 kqread syslogd 85630 292210 1 0 3 0x100082 sbwait syslogd 84914 190137 1 0 3 0x100080 kqread resolvd 14516 281608 48229 77 3 0x100092 kqread dhcpleased 16940 241743 48229 77 3 0x100092 kqread dhcpleased 48229 29380 1 0 3 0x80 kqread dhcpleased 99361 22447 0 0 3 0x14200 bored smr 36034 356050 0 0 2 0x14200 zerothread 79130 193527 0 0 3 0x14200 aiodoned aiodoned 3290 100439 0 0 3 0x14200 syncer update 66284 386837 0 0 3 0x14200 cleaner cleaner 2446 453672 0 0 3 0x14200 reaper reaper 94235 444603 0 0 3 0x14200 pgdaemon pagedaemon 63998 285625 0 0 3 0x14200 bored viomb 97743 363211 0 0 3 0x40014200 acpi0 acpi0 42071 287369 0 0 3 0x40014200 idle1 24877 198166 0 0 3 0x14200 bored softnet1 37381 339335 0 0 2 0x14200 softnet0 80048 463190 0 0 3 0x14200 smrbar systqmp 42397 65352 0 0 3 0x14200 bored systq 39469 200541 0 0 3 0x14200 tmoslp softclockmp 50473 305825 0 0 3 0x40014200 tmoslp softclock 96431 366274 0 0 3 0x40014200 idle0 1 443271 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 43551 (syz-executor) thread 0xffff8000387ecd48 (309920) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83933048) #0 witness_lock+1521 #1 unp_connect+652 #2 uipc_dgram_send+355 #3 sosend+2052 #4 sendit+1445 #5 sys_sendmsg+582 #6 syscall+3028 #7 Xsyscall+296 exclusive rwlock sbufsnd r = 0 (0xffff8000014e7418) #0 witness_lock+1521 #1 rw_do_enter_write+1049 #2 sblock+182 #3 sosend+745 #4 sendit+1445 #5 sys_sendmsg+582 #6 syscall+3028 #7 Xsyscall+296 Process 80091 (syz-executor) thread 0xffff8000fffeefa8 (319397) exclusive rrwlock inode r = 0 (0xfffffd805de26910) #0 witness_lock+1521 #1 rw_do_enter_write+1049 #2 rrw_enter+198 #3 VOP_LOCK+189 #4 vn_lock+164 #5 vget+674 #6 ufs_ihashget+389 #7 ffs_vget+140 #8 ufs_lookup+6710 #9 VOP_LOOKUP+110 #10 vfs_lookup+2362 #11 namei+1994 #12 dounlinkat+193 #13 syscall+2839 #14 Xsyscall+296 exclusive rrwlock inode r = 0 (0xfffffd80704ce230) #0 witness_lock+1521 #1 rw_do_enter_write+1049 #2 rrw_enter+198 #3 VOP_LOCK+189 #4 vn_lock+164 #5 vfs_lookup+284 #6 namei+1994 #7 dounlinkat+193 #8 syscall+2839 #9 Xsyscall+296 Process 43374 (syz-executor) thread 0xffff80003c447cc0 (463096) exclusive rrwlock inode r = 0 (0xfffffd806e8639f0) #0 witness_lock+1521 #1 rw_do_enter_write+1049 #2 rrw_enter+198 #3 VOP_LOCK+189 #4 ufs_ihashins+79 #5 ffs_vget+391 #6 ffs_inode_alloc+633 #7 ufs_mkdir+252 #8 VOP_MKDIR+257 #9 domkdirat+377 #10 syscall+2839 #11 Xsyscall+296 exclusive rrwlock inode r = 0 (0xfffffd806dba1eb8) #0 witness_lock+1521 #1 rw_do_enter_write+1049 #2 rrw_enter+198 #3 VOP_LOCK+189 #4 vn_lock+164 #5 vfs_lookup+284 #6 namei+1994 #7 domkdirat+139 #8 syscall+2839 #9 Xsyscall+296 Process 2807 (syz-executor) thread 0xffff8000ffffcf98 (14976) exclusive rrwlock inode r = 0 (0xfffffd806e86d378) #0 witness_lock+1521 #1 rw_do_enter_write+1049 #2 rrw_enter+198 #3 VOP_LOCK+189 #4 ufs_ihashins+79 #5 ffs_vget+391 #6 ffs_inode_alloc+633 #7 ufs_mkdir+252 #8 VOP_MKDIR+257 #9 domkdirat+377 #10 syscall+2839 #11 Xsyscall+296 exclusive rrwlock inode r = 0 (0xfffffd8070680448) #0 witness_lock+1521 #1 rw_do_enter_write+1049 #2 rrw_enter+198 #3 VOP_LOCK+189 #4 vn_lock+164 #5 vfs_lookup+284 #6 namei+1994 #7 domkdirat+139 #8 syscall+2839 #9 Xsyscall+296 Process 80048 (systqmp) thread 0xffff8000ffffe530 (463190) shared rwlock systqmp r = 0 (0xffffffff8387e3e8) #0 witness_lock+1521 #1 taskq_thread+298 #2 proc_trampoline+16 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10258 11129K 11511K 166960K 15028 0 pcb 18 16K 18K 166960K 749 0 rtable 225 14K 14K 166960K 946 0 pf 40 18K 82K 166960K 256 0 ifaddr 36 6K 8K 166960K 186 0 ifgroup 66 2K 3K 166960K 323 0 sysctl 4 1K 9K 166960K 19 0 counters 70 37K 38K 166960K 350 0 ioctlops 0 0K 4K 166960K 2245 0 iov 0 0K 36K 166960K 277 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1452 91K 92K 166960K 4157 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 23 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 102 0 dirhash 12 2K 2K 166960K 60 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 15 53K 236K 166960K 2643 0 sigio 0 0K 0K 166960K 56 0 proc 72 115K 164K 166960K 1031 0 subproc 72 4K 4K 166960K 154 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 460 0 in_multi 64 4K 7K 166960K 277 0 ether_multi 2 0K 0K 166960K 20 0 mrt 1 0K 0K 166960K 28 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 259 1155K 1155K 166960K 259 0 exec 0 0K 1K 166960K 923 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 5 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 230 151K 176K 166960K 25000 0 UVM aobj 63 12K 12K 166960K 66 0 pinsyscall 40 80K 102K 166960K 4002 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 149 0 NDP 13 0K 2K 166960K 130 0 temp 78 8668K 8924K 166960K 140116 0 kqueue 15 22K 31K 166960K 498 0 SYN cache 2 8K 16K 166960K 3 0 ddb{1}> 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 120 339 0 336 3 2 1 3 0 8 0 rtentry 176 299 0 223 6 1 5 6 0 8 1 unpcb 144 1480 0 1460 12 10 2 4 0 8 1 syncache 336 12 0 12 5 4 1 1 0 8 1 tcpqe 32 4 0 4 3 3 0 1 0 8 0 tcpcb 736 835 0 826 10 8 2 7 0 8 1 arp 136 54 0 38 1 0 1 1 0 8 0 inpcb 328 2933 0 2919 20 13 7 10 0 8 5 nd6 152 56 0 41 1 0 1 1 0 8 0 pkpcb 40 22 0 22 3 2 1 1 0 8 1 kcovpl 48 17 0 9 1 0 1 1 0 8 0 mppekey 1024 2 0 2 2 2 0 1 0 8 0 ppxss 1192 106 0 106 1 0 1 1 0 8 1 pppxif 1504 17 0 17 4 3 1 1 0 8 1 pfstscr 40 4 0 4 2 2 0 1 0 8 0 pffrag 232 14 0 7 1 0 1 1 0 482 0 pffrnode 88 14 0 7 1 0 1 1 0 8 0 pffrent 40 51 0 44 1 0 1 1 0 8 0 pfosfp 40 1430 0 1006 5 0 5 5 0 8 0 pfosfpen 112 1430 0 714 21 0 21 21 0 8 0 pfrktable 1344 1 0 1 1 1 0 1 0 8 0 pfstitem 24 84 0 64 1 0 1 1 0 8 0 pfstkey 128 92 0 72 3 0 3 3 0 8 0 pfstate 448 87 0 68 7 0 7 7 0 8 0 pfrule 1344 34 0 26 2 1 1 2 0 8 0 rttmr 136 6 0 6 4 4 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 1189 0 861 34 9 25 31 0 8 3 art_table 40 1193 0 861 6 1 5 6 0 8 0 art_node 32 297 0 229 1 0 1 1 0 8 0 sysvmsgpl 40 20 0 14 1 0 1 1 0 8 0 semupl 112 4 0 4 3 2 1 1 0 8 1 semapl 112 97 0 87 1 0 1 1 0 8 0 shmpl 112 58 0 3 2 0 2 2 0 8 0 dirhash 1024 49 0 32 3 0 3 3 0 8 0 dino2pl 256 6423 0 4897 96 0 96 96 0 8 0 ffsino 296 6423 0 4897 120 1 119 119 0 8 0 nchpl 144 9903 0 8175 65 0 65 65 0 8 0 rtmask 32 25 0 25 4 3 1 1 0 8 1 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 35941 0 35938 3 2 1 2 0 8 0 percpumem 16 190 0 140 1 0 1 1 0 8 0 vcpupl 3968 5 0 0 1 0 1 1 0 8 0 vmpool 840 5 0 0 1 0 1 1 0 8 0 kstatmem 264 198 0 166 4 1 3 3 0 8 0 acpiwqpl 32 4 0 4 1 0 1 1 1 8 1 scsiplug 72 41 0 41 6 5 1 1 0 8 1 scxspl 216 48896 0 48893 13 11 2 8 1 8 1 plimitpl 152 697 0 679 1 0 1 1 0 8 0 sigapl 424 2957 0 2892 9 1 8 8 0 8 0 knotepl 120 627 0 0 18 0 18 18 0 8 0 kqueuepl 224 1146 0 1135 13 8 5 5 0 8 4 pipepl 344 592 0 565 20 13 7 9 0 8 4 fdescpl 528 2880 0 2851 3 0 3 3 0 8 0 filepl 160 20254 0 20024 33 17 16 21 0 8 5 lockfpl 104 1255 0 1252 3 2 1 2 0 8 0 lockfspl 48 503 0 500 1 0 1 1 0 8 0 sessionpl 144 41 0 32 1 0 1 1 0 8 0 pgrppl 48 95 0 78 1 0 1 1 0 8 0 ucredpl 104 3196 0 3182 1 0 1 1 0 8 0 zombiepl 144 2893 0 2892 2 1 1 1 0 8 0 processpl 1232 2957 0 2892 8 2 6 6 0 8 0 procpl 664 7010 0 6939 11 3 8 8 0 8 0 sosppl 176 20 0 20 5 4 1 1 0 8 1 sockpl 752 4838 0 4801 26 15 11 14 0 8 6 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 11 0 0 2 0 2 2 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 67 0 0 6 0 6 6 0 8 0 mtagpl 96 107 0 0 3 0 3 3 0 8 0 mbufpl 256 1737 0 0 108 0 108 108 0 8 0 bufpl 280 17736 0 11599 439 0 439 439 0 8 0 anonpl 32 11815 0 0 95 0 95 95 0 246 0 amapchunkpl 152 86181 0 85659 52 21 31 42 0 158 4 amappl16 200 7310 0 7227 49 27 22 24 0 8 7 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 4 0 4 2 2 0 1 0 8 0 amappl13 176 547 0 546 1 0 1 1 0 8 0 amappl12 168 3357 0 3317 3 0 3 3 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 78 0 64 1 0 1 1 0 8 0 amappl9 144 256 0 255 1 0 1 1 0 8 0 amappl8 136 42 0 39 1 0 1 1 0 8 0 amappl7 128 121 0 119 1 0 1 1 0 8 0 amappl6 120 396 0 383 1 0 1 1 0 8 0 amappl5 112 102 0 91 1 0 1 1 0 8 0 amappl4 104 504 0 474 1 0 1 1 0 8 0 amappl3 96 15295 0 15215 4 1 3 3 0 8 0 amappl2 88 3034 0 2958 2 0 2 2 0 8 0 amappl1 80 22432 0 21835 16 1 15 15 0 8 0 amappl 88 23677 0 23523 5 0 5 5 0 92 0 uvmvnodes 80 181 0 0 4 0 4 4 0 8 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma4096 4096 3 0 3 3 3 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 259 0 259 5 4 1 1 0 8 1 dma64 64 7 0 7 2 2 0 1 0 8 0 dma32 32 9 0 9 2 2 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 65 0 3 2 0 2 2 0 8 0 uaddrrnd 24 2880 0 2851 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2880 0 2851 1 0 1 1 0 8 0 vmmpekpl 168 23995 0 23922 4 0 4 4 0 8 0 vmmpepl 168 185751 0 183856 122 15 107 107 0 357 4 vmsppl 488 2879 0 2851 7 2 5 5 0 8 0 rwobjpl 80 47351 0 46131 37 3 34 34 0 8 1 pdppl 4096 5778 0 5707 134 57 77 84 0 8 6 pvpl 32 21340 0 0 174 3 171 172 0 265 0 pmappl 256 2884 0 2851 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 441 0 88 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+39: addq $8,%rsp ddb{0}> trace x86_ipi_db(ffffffff837bbff0) at x86_ipi_db+39 x86_ipi_handler() at x86_ipi_handler+217 Xresume_lapic_ipi() at Xresume_lapic_ipi+39 __mp_lock(ffffffff83932e40) at __mp_lock+402 intr_handler(ffff80002a37a580,ffff80000006b400) at intr_handler+233 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+399 end of kernel end trace frame: 0x7b0537468f00, count: -6 ddb{0}> machine ddbcpu 1 Stopped at db_enter+37: addq $8,%rsp ddb{1}> trace db_enter() at db_enter+37 witness_checkorder(fffffd805de267e8,9,0) at witness_checkorder+4305 rw_do_enter_write(fffffd805de267d0,1) at rw_do_enter_write+186 rrw_enter(fffffd805de267d0,1) at rrw_enter+198 VOP_LOCK(fffffd806be836d8,2001) at VOP_LOCK+189 vn_lock(fffffd806be836d8,2001) at vn_lock+164 vfs_lookup(ffff80002a2f9b40) at vfs_lookup+284 namei(ffff80002a2f9b40) at namei+1994 unp_connect(ffff8000014e7230,fffffd806caace00,ffff8000387ecd48) at unp_connect+669 uipc_dgram_send(ffff8000014e7230,fffffd806ae4de00,fffffd806caace00,0) at uipc_dgram_send+355 sosend(ffff8000014e7230,fffffd806caace00,ffff80002a2f9dc8,0,0,e) at sosend+2052 sendit(ffff8000387ecd48,5,ffff80002a2f9f48,e,ffff80002a2fa000) at sendit+1445 sys_sendmsg(ffff8000387ecd48,ffff80002a2fa0b0,ffff80002a2fa000) at sys_sendmsg+582 syscall(ffff80002a2fa0b0) at syscall+3028 Xsyscall() at Xsyscall+296 end of kernel end trace frame: 0xe9e61142740, count: -15