kernel: protection fault trap, code=0 Stopped at witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> show kasan No such command ddb{1}> trace witness_checkorder(dead4110dead4228,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(dead4110dead4218) at mtx_enter+0x95 sys/kern/kern_lock.c:406 prsignal(dead4110dead4110,14) at prsignal+0x36 sys/kern/kern_sig.c:905 reaper(ffff800045ffd760) at reaper+0x2ec sys/kern/kern_exit.c:518 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a1f49c0 rbx 0 rdx 0 rcx 0xffff800045ffd760 rax 0xffff80002999dffe r8 0x7f7fffffc000 r9 0x1 r10 0xd360252419b5c8a2 r11 0x9fa4d04f9807ec92 r12 0xdead4110dead42fe r13 0x9 r14 0xdead4110dead4228 r15 0 rip 0xffffffff81d3c945 witness_checkorder+0xb5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a1f4920 ss 0x10 witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{1}> show proc PROC (reaper) tid=261173 pid=87817 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800045fff758,0xffff800045ffd240 process=0xffff800045ffab98 user=0xffff80002a1ef000, vmspace=0xffffffff83a690d8 estcpu=0, cpticks=7, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 59295 127273 92613 32767 2 0x10 0 syz-executor 59295 247018 92613 32767 3 0x10 0x4000000 biowait syz-executor 59295 375110 92613 32767 2 0x10 0x4000000 syz-executor 18573 486447 28946 32767 2 0x10 0 syz-executor 18573 237303 28946 32767 3 0x10 0x4000080 msgwait syz-executor 18573 488426 28946 32767 3 0x10 0x4000080 fsleep syz-executor 18573 391092 28946 32767 3 0x10 0x4000080 fsleep syz-executor 83744 395845 45086 32767 2 0x10 0 syz-executor 83744 108017 45086 32767 7 0x10 0x4000000 syz-executor 83744 22048 45086 32767 3 0x10 0x4000080 fsleep syz-executor 55269 50380 68024 32767 3 0x10 0x80 nanoslp syz-executor 55269 221765 68024 32767 3 0x10 0x4000080 sbwait syz-executor 55269 321287 68024 32767 3 0x10 0x4000080 fsleep syz-executor 68024 337983 62713 32767 2 0x10 0 syz-executor 62713 108831 49799 0 3 0x2 0x80 wait syz-executor 35519 11779 21224 32767 2 0x10000010 0x80 syz-executor 21224 119125 49799 0 3 0x2 0x80 wait syz-executor 28946 345108 91715 32767 3 0x10 0x80 nanoslp syz-executor 91715 311315 49799 0 3 0x2 0x80 wait syz-executor 45086 420804 10608 32767 3 0x10 0x80 nanoslp syz-executor 10608 238102 49799 0 3 0x2 0x80 wait syz-executor 26443 34373 64964 32767 2 0x10 0 syz-executor 64964 151165 49799 0 3 0x2 0x80 wait syz-executor 45775 179910 80135 0 3 0x100002 0x80 sbwait arp 80135 374468 95336 0 3 0x100002 0x88 sigsusp sh 92613 465998 45741 32767 3 0x10 0x80 nanoslp syz-executor 34351 266841 89794 32767 3 0x10 0x80 nanoslp syz-executor 95336 471895 24139 0 3 0 0x80 wait syz-executor 89794 233271 49799 0 3 0x2 0x80 wait syz-executor 24139 56828 49799 0 3 0x2 0x80 wait syz-executor 45741 513448 49799 0 3 0x2 0x80 wait syz-executor 49799 452881 94996 0 3 0x2 0x80 kqread syz-executor 94996 503045 32969 0 3 0x100002 0x88 sigsusp ksh 32969 242238 40131 0 3 0x10 0x88 kqread sshd-session 40131 54873 15340 0 3 0x12 0x80 kqread sshd-session 49212 350593 1 0 3 0x100003 0x80 ttyin getty 15340 231184 1 0 3 0 0x88 kqread sshd 61217 319629 86307 73 3 0x1100010 0x80 kqread syslogd 86307 52840 1 0 3 0x100002 0x80 sbwait syslogd 91209 116160 1 0 3 0x100000 0x80 kqread resolvd 99452 496019 15219 77 3 0x100012 0x80 kqread dhcpleased 39690 53250 15219 77 3 0x100012 0x80 kqread dhcpleased 15219 271909 1 0 3 0 0x80 kqread dhcpleased 30910 411465 0 0 3 0x14000 0x200 bored smr 78302 424602 0 0 2 0x14000 0x200 zerothread 80851 267082 0 0 3 0x14000 0x200 aiodoned aiodoned 64423 203515 0 0 3 0x14000 0x200 syncer update 95950 429166 0 0 3 0x14000 0x200 cleaner cleaner *87817 261173 0 0 7 0x14000 0x200 reaper 62049 202418 0 0 3 0x14000 0x200 pgdaemon pagedaemon 97752 511486 0 0 3 0x14000 0x200 bored viomb 2236 385013 0 0 3 0x14000 0x40000200 acpi0 acpi0 86345 94346 0 0 3 0x14000 0x40000200 idle1 72651 24453 0 0 3 0x14000 0x200 bored softnet1 18055 368453 0 0 3 0x14000 0x200 bored softnet0 69297 474964 0 0 3 0x14000 0x200 bored systqmp 53575 354855 0 0 3 0x14000 0x200 bored systq 50049 97838 0 0 3 0x14000 0x200 tmoslp softclockmp 75806 461008 0 0 3 0x14000 0x40000200 tmoslp softclock 60829 14303 0 0 3 0x14000 0x40000200 idle0 1 516099 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{1}> show all locks Process 59295 (syz-executor) thread 0xffff800045fe87e8 (247018) exclusive rrwlock inode r = 0 (0xfffff6006cbdb568) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:150 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_makeinode+0xcd sys/ufs/ufs/ufs_vnops.c:1759 #8 ufs_symlink+0x54 sys/ufs/ufs/ufs_vnops.c:1293 #9 VOP_SYMLINK+0x119 sys/kern/vfs_vops.c:432 #10 dosymlinkat+0x1e0 sys/kern/vfs_syscalls.c:1761 #11 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 #12 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffff6006f7856d8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431 #6 namei+0x7c1 sys/kern/vfs_lookup.c:250 #7 dosymlinkat+0xef sys/kern/vfs_syscalls.c:1747 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 #9 Xsyscall+0x128 Process 83744 (syz-executor) thread 0xffff80003c3d2030 (108017) shared rwlock vmmaplk r = 0 (0xfffff6006d0348c8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:285 #6 kerntrap+0x19d sys/arch/amd64/amd64/trap.c:532 #7 alltraps_kern_meltdown+0x7b #8 copyout+0x64 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 #10 Xsyscall+0x128 Process 87817 (reaper) thread 0xffff800045ffd760 (261173) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839f1540) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 sleep_finish+0x2d8 sys/kern/kern_synch.c:369 #3 rw_do_enter_write+0x1dc sys/kern/kern_rwlock.c:298 #4 knote_processexit+0x2b sys/kern/kern_event.c:2235 #5 reaper+0x26d sys/kern/kern_exit.c:515 #6 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11051 12018K 12034K 166960K 12160 0 pcb 17 12K 12K 166960K 17 0 rtable 223 6K 6K 166960K 518 0 pf 31 16K 16K 166960K 43 0 ifaddr 40 7K 7K 166960K 68 0 ifgroup 50 2K 2K 166960K 74 0 sysctl 3 1K 9K 166960K 7 0 counters 70 37K 37K 166960K 82 0 ioctlops 0 0K 2K 166960K 39 0 iov 0 0K 1K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1287 81K 81K 166960K 1420 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 9 0K 1K 166960K 12 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 25 93K 129K 166960K 345 0 sigio 0 0K 0K 166960K 1 0 proc 61 115K 147K 166960K 669 0 subproc 72 4K 4K 166960K 126 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 22 0 in_multi 89 6K 6K 166960K 159 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 446 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 243 153K 175K 166960K 4452 0 UVM aobj 6 2K 4K 166960K 7 0 pinsyscall 47 94K 114K 166960K 1602 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 9 0 NDP 13 0K 1K 166960K 43 0 temp 36 9114K 9134K 166960K 4298 0 kqueue 18 25K 29K 166960K 51 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 55 0 51 1 0 1 1 0 8 0 rtentry 176 170 0 67 5 0 5 5 0 8 0 unpcb 144 162 0 147 1 0 1 1 0 8 0 syncache 336 7 0 7 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 67 0 62 1 0 1 1 0 8 0 arp 136 29 0 12 1 0 1 1 0 8 0 inpcb 328 276 0 267 6 0 6 6 0 8 4 ip6q 80 17 0 16 1 0 1 1 0 8 0 ip6af 40 33 0 32 1 0 1 1 0 8 0 nd6 152 40 0 18 1 0 1 1 0 8 0 kcovpl 48 14 0 6 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 680 0 264 26 0 26 26 0 8 0 art_table 40 681 0 264 5 0 5 5 0 8 0 art_node 32 170 0 76 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 0 1 1 0 8 1 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 8 0 1 1 0 1 1 0 8 0 shmpl 120 4 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1727 0 251 93 0 93 93 0 8 0 ffsino 296 1727 0 251 114 0 114 114 0 8 0 nchpl 144 2064 0 355 64 0 64 64 0 8 0 vnodes 216 1862 0 0 104 0 104 104 0 8 0 namei 1024 7712 0 7710 3 1 2 2 0 8 1 percpumem 16 57 0 6 1 0 1 1 0 8 0 kstatmem 264 37 0 12 2 0 2 2 0 8 0 scxspl 216 7183 0 7182 4 1 3 3 1 8 2 plimitpl 152 62 0 38 2 0 2 2 0 8 0 sigapl 424 631 0 577 7 0 7 7 0 8 0 knotepl 120 286 0 0 9 0 9 9 0 8 0 kqueuepl 224 53 0 41 1 0 1 1 0 8 0 pipepl 344 150 0 123 3 0 3 3 0 8 0 fdescpl 528 615 0 578 4 0 4 4 0 8 1 filepl 160 2451 0 2239 12 0 12 12 0 8 2 lockfpl 104 65 0 62 1 0 1 1 0 8 0 lockfspl 48 25 0 22 1 0 1 1 0 8 0 sessionpl 144 39 0 23 1 0 1 1 0 8 0 pgrppl 48 53 0 29 1 0 1 1 0 8 0 ucredpl 104 290 0 272 1 0 1 1 0 8 0 zombiepl 144 579 0 577 1 0 1 1 0 8 0 processpl 1240 631 0 577 5 0 5 5 0 8 0 procpl 664 834 0 771 7 0 7 7 0 8 0 sockpl 752 499 0 471 10 0 10 10 0 8 6 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 43 0 0 6 0 6 6 0 8 0 mextrefs 64 43 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 272 0 0 17 0 17 17 0 8 0 bufpl 272 2560 0 102 164 0 164 164 0 8 0 anonpl 32 7897 0 0 64 0 64 64 0 247 0 amapchunkpl 152 12717 0 12197 36 0 36 36 0 158 9 amappl16 200 1750 0 1729 5 2 3 5 0 8 1 amappl15 192 9 0 9 1 1 0 1 0 8 0 amappl14 184 470 0 468 1 0 1 1 0 8 0 amappl13 176 162 0 151 1 0 1 1 0 8 0 amappl12 168 868 0 833 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 71 0 61 1 0 1 1 0 8 0 amappl9 144 301 0 301 1 1 0 1 0 8 0 amappl8 136 116 0 115 1 0 1 1 0 8 0 amappl7 128 153 0 141 1 0 1 1 0 8 0 amappl6 120 210 0 208 1 0 1 1 0 8 0 amappl5 112 103 0 95 1 0 1 1 0 8 0 amappl4 104 289 0 273 1 0 1 1 0 8 0 amappl3 96 2236 0 2136 4 1 3 3 0 8 0 amappl2 88 744 0 668 3 0 3 3 0 8 1 amappl1 80 12743 0 12142 17 0 17 17 0 8 1 amappl 88 3637 0 3461 5 0 5 5 0 92 0 uvmvnodes 80 100 0 0 3 0 3 3 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 6 0 1 1 0 1 1 0 8 0 uaddrrnd 24 615 0 578 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 615 0 578 1 0 1 1 0 8 0 vmmpekpl 168 7246 0 7203 3 0 3 3 0 8 0 vmmpepl 168 50117 0 48077 107 0 107 107 0 357 8 vmsppl 488 614 0 578 7 1 6 6 0 8 0 rwobjpl 80 17729 0 16741 26 0 26 26 0 8 3 pdppl 4096 1237 0 1156 115 22 93 99 0 8 12 pvpl 32 17717 0 0 143 0 143 143 0 265 0 pmappl 256 614 0 578 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 455 0 26 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff8397fff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff839f0d40) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839f0d40) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff8000337899f0,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f witness_unlock(fffff6006d0348c8,0) at witness_unlock+0x14 sys/kern/subr_witness.c:1251 rw_do_exit_read(fffff6006d0348b0,8) at rw_do_exit_read+0x3b sys/kern/kern_rwlock.c:117 uvmfault_lookup(ffff800033789d10,0) at uvmfault_lookup+0x22a sys/uvm/uvm_fault.c:1882 uvm_fault_check(ffff800033789d10,ffff800033789d48,ffff800033789d80,0) at uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 uvm_fault(fffff6006d0347c8,1000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627 kpageflttrap(ffff800033789ec0,15e0) at kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:285 kerntrap(ffff800033789ec0) at kerntrap+0x19d sys/arch/amd64/amd64/trap.c:532 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x64 syscall(ffff80003378a300) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003378a300) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5a66fdcab10, count: -17 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{1}> trace witness_checkorder(dead4110dead4228,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(dead4110dead4218) at mtx_enter+0x95 sys/kern/kern_lock.c:406 prsignal(dead4110dead4110,14) at prsignal+0x36 sys/kern/kern_sig.c:905 reaper(ffff800045ffd760) at reaper+0x2ec sys/kern/kern_exit.c:518 end trace frame: 0x0, count: -4