login: witness: lock order reversal: 1st 0xffffffff8290fe50 netlock (netlock) 2nd 0xfffffd807e81a8d0 vmmaplk (&map->lock) lock order "&map->lock"(rwlock) -> "netlock"(rwlock) first seen at: #0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 #1 udp_sysctl+0x8a sys/netinet/udp_usrreq.c:1269 #2 sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 lock order "netlock"(rwlock) -> "&map->lock"(rwlock) first seen at: #0 rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #4 kpageflttrap+0x209 #5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x53 #8 ifioctl_get+0x2dd #9 soo_ioctl+0x26c #10 fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307 #11 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #12 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 #13 sys_ioctl+0x4a2 #14 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #14 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #15 Xsyscall+0x128 Stopped at db_enter+0x18: addq $0x8,%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+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(fffffd807e81a8d0,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd807e81a8d0,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd807e81a8c0) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff800024695220,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff800024695220,ffff800024695258,ffff800024695280) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd807e81a8b8,2000c000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff8000246953b0,2000cf00) at kpageflttrap+0x209 kerntrap(ffff8000246953b0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 ifioctl_get(c0106924,ffff800024695900) at ifioctl_get+0x2dd soo_ioctl(ffff800024695660,c0106924,ffff800024695900,ffff80002469ad30) at soo_ioctl+0x26c fifo_ioctl(ffff800024695748) at fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307 VOP_IOCTL(fffffd8066284670,c0106924,ffff800024695900,3,fffffd807f7d8480,ffff80002469ad30) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8066799448,c0106924,ffff800024695900,ffff80002469ad30) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 sys_ioctl(ffff80002469ad30,ffff800024695a18,ffff800024695a70) at sys_ioctl+0x4a2 syscall(ffff800024695ae0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800024695ae0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd752594ea30, count: -18 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff800024694f10 rbx 0x3 rdx 0xffff800000bc1b80 rcx 0 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffff800024694e80 r9 0x8080808080808080 r10 0xc908e5354468523a r11 0xd1e18d4abc1987e r12 0xffffffff82ab0590 w_lodata+0x52c20 r13 0 r14 0xffffffff82aab470 w_lodata+0x4db00 r15 0xfffffd8002f62d80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024694f00 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=505777 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002469aa90,0xffffffff82b3d400 process=0xffff800029323200 user=0xffff800024690000, vmspace=0xfffffd807e81a8b8 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 61284 248624 80244 32767 7 0x10 syz-executor.1 *61284 505777 80244 32767 7 0x4000010 syz-executor.1 11814 220333 0 0 3 0x14200 bored sosplice 42465 73845 21393 32767 3 0x90 piperd syz-executor.5 48038 304545 93044 32767 3 0x90 piperd syz-executor.6 42204 415604 12993 32767 3 0x90 piperd syz-executor.7 89473 83333 49820 32767 3 0x90 piperd syz-executor.4 12993 85312 59638 0 3 0x82 wait syz-executor.7 93044 431565 59638 0 3 0x82 wait syz-executor.6 21393 368978 59638 0 3 0x82 wait syz-executor.5 49820 310510 59638 0 3 0x82 wait syz-executor.4 11281 14468 48487 32767 3 0x90 piperd syz-executor.3 4264 272622 71773 32767 3 0x10 biowait syz-executor.2 48487 70830 59638 0 3 0x82 wait syz-executor.3 71773 398529 59638 0 3 0x82 wait syz-executor.2 80244 321937 7650 32767 3 0x90 nanoslp syz-executor.1 12584 420885 77470 32767 3 0x90 nanoslp syz-executor.0 7650 520275 59638 0 3 0x82 wait syz-executor.1 77470 253092 59638 0 3 0x82 wait syz-executor.0 59638 199567 12711 0 3 0x82 thrsleep syz-fuzzer 59638 300712 12711 0 3 0x4000082 nanoslp syz-fuzzer 59638 21077 12711 0 3 0x4000082 kqread syz-fuzzer 59638 214278 12711 0 3 0x4000082 thrsleep syz-fuzzer 59638 59988 12711 0 3 0x4000082 thrsleep syz-fuzzer 59638 423907 12711 0 3 0x4000082 thrsleep syz-fuzzer 59638 415220 12711 0 3 0x4000082 nanoslp syz-fuzzer 59638 147394 12711 0 3 0x4000082 thrsleep syz-fuzzer 59638 11220 12711 0 3 0x4000082 thrsleep syz-fuzzer 12711 98395 36131 0 3 0x10008a sigsusp ksh 36131 184729 19502 0 3 0x9a kqread sshd 80972 491592 1 0 3 0x100083 ttyin getty 19502 71873 1 0 3 0x88 kqread sshd 62236 2215 98403 73 3 0x1100090 kqread syslogd 98403 457199 1 0 3 0x100082 netio syslogd 33953 110430 1 0 3 0x100080 kqread resolvd 60747 117306 16533 77 3 0x100092 kqread dhcpleased 59019 419499 16533 77 3 0x100092 kqread dhcpleased 16533 512291 1 0 3 0x80 kqread dhcpleased 7222 156209 0 0 3 0x14200 bored smr 52746 379388 0 0 3 0x14200 pgzero zerothread 31828 12554 0 0 3 0x14200 aiodoned aiodoned 8310 145087 0 0 3 0x14200 syncer update 98593 496337 0 0 3 0x14200 cleaner cleaner 20754 47838 0 0 3 0x14200 reaper reaper 81926 273980 0 0 3 0x14200 pgdaemon pagedaemon 30247 150867 0 0 3 0x14200 bored viomb 12294 75548 0 0 3 0x40014200 acpi0 acpi0 56090 199015 0 0 3 0x40014200 idle1 14229 368578 0 0 3 0x14200 bored softnet 74498 355845 0 0 3 0x14200 bored systqmp 99555 28648 0 0 3 0x14200 bored systq 55861 255624 0 0 3 0x40014200 bored softclock 70447 308976 0 0 3 0x40014200 idle0 1 115123 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 61284 (syz-executor.1) thread 0xffff80002469ad30 (505777) shared rwlock netlock r = 0 (0xffffffff8290fe50) #0 witness_lock+0x44d #1 ifioctl_get+0x2d5 sys/net/if.c:2319 #2 soo_ioctl+0x26c #3 fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307 #4 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #5 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 #6 sys_ioctl+0x4a2 #7 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #7 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #8 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff829de988) #0 witness_lock+0x44d #1 vn_ioctl+0x41 sys/kern/vfs_vnops.c:514 #2 sys_ioctl+0x4a2 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 Process 4264 (syz-executor.2) thread 0xffff8000ffff77b0 (272622) exclusive rrwlock inode r = 0 (0xfffffd80768aa818) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347 #6 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #8 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 #9 domkdirat+0x121 sys/kern/vfs_syscalls.c:3101 #10 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #10 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c8281a8) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3086 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10172 6407K 6419K 78643K 11262 0 pcb 13 8K 8K 78643K 13 0 rtable 238 6K 7K 78643K 348 0 ifaddr 81 16K 16K 78643K 82 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 2K 78643K 33 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1271 79K 79K 78643K 1288 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 12548 0 file desc 19 69K 125K 78643K 274 0 proc 56 74K 111K 78643K 451 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 8 0 in_multi 99 6K 6K 78643K 99 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 49 228K 228K 78643K 49 0 exec 0 0K 2K 78643K 603 0 tdb 3 0K 0K 78643K 3 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 253 77K 79K 78643K 4632 0 UVM aobj 39 2K 2K 78643K 39 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 11 0K 2K 78643K 27 0 temp 84 4693K 4757K 78643K 4539 0 kqueue 12 18K 22K 78643K 38 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> 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 40 0 37 1 0 1 1 0 8 0 rtentry 112 111 0 1 4 0 4 4 0 8 0 unpcb 136 50 0 35 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpcb 736 20 0 16 2 0 2 2 0 8 1 arp 120 18 0 0 1 0 1 1 0 8 0 inpcb 304 92 0 85 1 0 1 1 0 8 0 nd6 48 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 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 32 453 0 0 4 0 4 4 0 8 0 art_node 16 110 0 10 1 0 1 1 0 8 0 shmpl 112 36 0 0 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1635 0 206 90 0 90 90 0 8 0 ffsino 272 1635 0 206 96 0 96 96 0 8 0 nchpl 144 2028 0 371 62 0 62 62 0 8 0 uvmvnodes 80 1748 0 0 36 0 36 36 0 8 0 vnodes 224 1748 0 0 103 0 103 103 0 8 0 namei 1024 6475 0 6474 2 0 2 2 0 8 1 percpumem 16 40 0 0 1 0 1 1 0 8 0 scxspl 216 6215 0 6214 2 1 1 2 0 8 0 plimitpl 152 41 0 19 1 0 1 1 0 8 0 sigapl 424 552 0 506 7 0 7 7 0 8 0 futexpl 64 589 0 589 1 0 1 1 0 8 1 knotepl 120 109 0 0 4 0 4 4 0 8 0 kqueuepl 216 34 0 26 1 0 1 1 0 8 0 pipepl 336 123 0 95 3 0 3 3 0 8 0 fdescpl 496 537 0 507 7 1 6 6 0 8 1 filepl 152 1762 0 1528 10 0 10 10 0 8 0 lockfpl 104 18 0 16 1 0 1 1 0 8 0 lockfspl 48 8 0 6 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 23 0 7 1 0 1 1 0 8 0 ucredpl 96 148 0 130 1 0 1 1 0 8 0 zombiepl 144 507 0 506 1 0 1 1 0 8 0 processpl 1064 552 0 506 5 1 4 4 0 8 0 procpl 672 708 0 653 6 0 6 6 0 8 0 sosppl 168 4 0 4 1 0 1 1 0 8 1 sockpl 480 182 0 157 4 0 4 4 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 127 0 0 15 0 15 15 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 316 0 0 20 0 20 20 0 8 0 bufpl 288 3733 0 137 257 0 257 257 0 8 0 anonpl 24 95637 0 86015 70 2 68 68 0 186 1 amapchunkpl 152 10236 0 9653 31 1 30 30 0 158 3 amappl16 200 733 0 501 15 1 14 14 0 8 0 amappl15 192 156 0 148 1 0 1 1 0 8 0 amappl14 184 28 0 24 1 0 1 1 0 8 0 amappl13 176 103 0 100 1 0 1 1 0 8 0 amappl12 168 44 0 40 1 0 1 1 0 8 0 amappl11 160 101 0 85 1 0 1 1 0 8 0 amappl10 152 31 0 26 1 0 1 1 0 8 0 amappl9 144 468 0 464 1 0 1 1 0 8 0 amappl8 136 552 0 511 2 0 2 2 0 8 0 amappl7 128 120 0 109 1 0 1 1 0 8 0 amappl6 120 203 0 182 2 0 2 2 0 8 1 amappl5 112 246 0 233 1 0 1 1 0 8 0 amappl4 104 870 0 839 2 0 2 2 0 8 0 amappl3 96 214 0 194 1 0 1 1 0 8 0 amappl2 88 529 0 484 3 0 3 3 0 8 1 amappl1 80 12564 0 12005 18 2 16 18 0 8 1 amappl 88 4219 0 4030 6 0 6 6 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 38 0 0 1 0 1 1 0 8 0 uaddrrnd 24 537 0 507 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 537 0 507 1 0 1 1 0 8 0 vmmpekpl 168 8528 0 8483 3 0 3 3 0 8 0 vmmpepl 168 50649 0 48621 114 0 114 114 0 357 9 vmsppl 368 536 0 507 4 0 4 4 0 8 0 rwobjpl 56 14737 0 11872 42 0 42 42 0 8 0 pdppl 4096 1081 0 1014 107 26 81 95 0 8 14 pvpl 32 299019 0 284862 259 0 259 259 0 265 128 pmappl 248 536 0 507 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 634 0 28 18 0 18 18 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff829baff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff829de780) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff800029317780,ffff800000077500) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xb sys/dev/kcov.c:144 intr_handler(ffff8000293178e0,ffff80000004ad00) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge21_untramp() at Xintr_ioapic_edge21_untramp+0x18f end of kernel end trace frame: 0x7f7ffffd8110, count: -9 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(fffffd807e81a8d0,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd807e81a8d0,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd807e81a8c0) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff800024695220,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff800024695220,ffff800024695258,ffff800024695280) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd807e81a8b8,2000c000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff8000246953b0,2000cf00) at kpageflttrap+0x209 kerntrap(ffff8000246953b0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 ifioctl_get(c0106924,ffff800024695900) at ifioctl_get+0x2dd soo_ioctl(ffff800024695660,c0106924,ffff800024695900,ffff80002469ad30) at soo_ioctl+0x26c fifo_ioctl(ffff800024695748) at fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307 VOP_IOCTL(fffffd8066284670,c0106924,ffff800024695900,3,fffffd807f7d8480,ffff80002469ad30) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8066799448,c0106924,ffff800024695900,ffff80002469ad30) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 sys_ioctl(ffff80002469ad30,ffff800024695a18,ffff800024695a70) at sys_ioctl+0x4a2 syscall(ffff800024695ae0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800024695ae0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd752594ea30, count: -18