kernel: protection fault trap, code=0 Stopped at witness_checkorder+0xa9: movl 0x18(%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}> trace witness_checkorder(dead4110dead4230,9,0) at witness_checkorder+0xa9 sys/kern/subr_witness.c:775 mtx_enter(dead4110dead4220) at mtx_enter+0x47 sys/kern/kern_lock.c:238 prsignal(dead4110dead4110,14) at prsignal+0x36 sys/kern/kern_sig.c:908 reaper(ffff8000ffffc008) at reaper+0x32c sys/kern/kern_exit.c:489 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a3c2120 rbx 0 rdx 0 rcx 0xffff8000ffffc008 rax 0xffff800029b5bff0 r8 0x2 r9 0x1 r10 0x115d6fec596b2f02 r11 0xbc33793f188dcf63 r12 0 r13 0x1 r14 0xdead4110dead4230 r15 0x3 rip 0xffffffff81229069 witness_checkorder+0xa9 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a3c2070 ss 0x10 witness_checkorder+0xa9: movl 0x18(%r14),%r15d ddb{1}> show proc PROC (reaper) tid=433582 pid=43714 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=32, usrpri=51, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffccb0,0xffff8000ffffc2a0 process=0xffff80002a3c5488 user=0xffff80002a3bd000, vmspace=0xffffffff83672678 estcpu=1, cpticks=3, pctcpu=0.45, user=0, sys=132, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 99250 166380 2569 32767 2 0x10 syz-executor 99250 412185 2569 32767 2 0x4000010 syz-executor 48412 408133 75586 32767 7 0x10 syz-executor 48412 296263 75586 32767 3 0x4000090 ttyout syz-executor 48412 67383 75586 32767 3 0x4000090 fsleep syz-executor 48412 461053 75586 32767 3 0x4000090 fsleep syz-executor 27717 44563 40029 32767 2 0x10 syz-executor 27717 39679 40029 32767 3 0x4000090 fsleep syz-executor 66923 208059 0 0 3 0x14200 bored sosplice 85982 60078 96466 32767 2 0x10 syz-executor 30519 211437 20271 32767 3 0x90 piperd syz-executor 44011 411924 44053 32767 3 0x90 piperd syz-executor 5236 400643 16534 32767 3 0x10 biowait syz-executor 40029 237317 42951 32767 3 0x90 nanoslp syz-executor 75586 502965 93288 32767 3 0x90 nanoslp syz-executor 2569 220186 63964 32767 3 0x90 nanoslp syz-executor 44053 186931 70858 0 3 0x82 wait syz-executor 20271 78183 70858 0 3 0x82 wait syz-executor 16534 228625 70858 0 3 0x82 wait syz-executor 93288 461789 70858 0 3 0x82 wait syz-executor 96466 271986 70858 0 3 0x82 wait syz-executor 63964 456195 70858 0 3 0x82 wait syz-executor 42951 137822 70858 0 3 0x82 wait syz-executor 70858 248151 68676 0 3 0x82 nanoslp syz-executor 68676 33485 42049 0 3 0x10008a sigsusp ksh 42049 287979 88156 0 3 0x98 kqread sshd-session 88156 480723 1858 0 3 0x92 kqread sshd-session 37113 28238 1 0 3 0x100083 ttyin getty 1858 175192 1 0 3 0x88 kqread sshd 34162 123262 94227 73 3 0x1100090 kqread syslogd 94227 108181 1 0 3 0x100082 sbwait syslogd 61150 143021 1 0 3 0x100080 kqread resolvd 16849 311419 37093 77 3 0x100092 kqread dhcpleased 86236 275598 37093 77 3 0x100092 kqread dhcpleased 37093 387847 1 0 3 0x80 kqread dhcpleased 70561 310564 0 0 3 0x14200 bored smr 87902 183685 0 0 2 0x14200 zerothread 92670 322061 0 0 3 0x14200 aiodoned aiodoned 71606 83642 0 0 3 0x14200 syncer update 41238 114427 0 0 3 0x14200 cleaner cleaner *43714 433582 0 0 7 0x14200 reaper 81039 479213 0 0 3 0x14200 pgdaemon pagedaemon 73214 428552 0 0 3 0x14200 bored viomb 52108 329115 0 0 3 0x40014200 acpi0 acpi0 64665 109706 0 0 3 0x40014200 idle1 31854 479753 0 0 3 0x14200 bored softnet3 6888 188884 0 0 3 0x14200 bored softnet2 42213 290455 0 0 3 0x14200 bored softnet1 82185 292547 0 0 3 0x14200 bored softnet0 99568 343655 0 0 3 0x14200 bored systqmp 91653 90230 0 0 3 0x14200 bored systq 12530 181185 0 0 3 0x14200 tmoslp softclockmp 86354 261264 0 0 3 0x40014200 tmoslp softclock 27909 502048 0 0 3 0x40014200 idle0 1 260714 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 48412 (syz-executor) thread 0xffff8000ffff62a8 (408133) exclusive rwlock uobjlk r = 0 (0xfffffd806cf73058) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 uvm_fault+0x1e9 sys/uvm/uvm_fault.c:690 #3 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #4 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806c233bd8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_read+0x3af sys/kern/kern_rwlock.c:405 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1864 #3 uvm_fault_check+0x4b sys/uvm/uvm_fault.c:732 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:668 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #6 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #7 recall_trap+0x8 Process 5236 (syz-executor) thread 0xffff8000ffff9458 (400643) exclusive rrwlock inode r = 0 (0xfffffd806c0ab618) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2bd sys/kern/vfs_subr.c:694 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1851 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c32e878) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1851 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 Process 43714 (reaper) thread 0xffff8000ffffc008 (433582) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff835f89c8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 __mp_acquire_count+0x58 #2 mi_switch+0x4b7 sys/kern/sched_bsd.c:441 #3 sleep_finish+0x24f sys/kern/kern_synch.c:414 #4 rw_do_enter_write+0x1de sys/kern/kern_rwlock.c:292 #5 knote_processexit+0x2b sys/kern/kern_event.c:2063 #6 reaper+0x2ad sys/kern/kern_exit.c:486 #7 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10183 10952K 10966K 166960K 11265 0 pcb 17 12K 12K 166960K 17 0 rtable 218 6K 6K 166960K 372 0 pf 29 16K 16K 166960K 31 0 ifaddr 38 6K 7K 166960K 44 0 ifgroup 46 2K 2K 166960K 50 0 sysctl 3 1K 1K 166960K 4 0 counters 62 36K 36K 166960K 64 0 ioctlops 0 0K 2K 166960K 34 0 iov 0 0K 16K 166960K 88 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1332 84K 84K 166960K 1605 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 24 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 19 69K 125K 166960K 475 0 sigio 0 0K 0K 166960K 2 0 proc 58 79K 115K 166960K 491 0 subproc 63 3K 4K 166960K 252 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 46 0 in_multi 88 6K 7K 166960K 112 0 ether_multi 1 0K 0K 166960K 5 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 399 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 193 64K 82K 166960K 5431 0 UVM aobj 17 4K 4K 166960K 18 0 pinsyscall 40 80K 112K 166960K 1522 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 21 0 NDP 10 0K 2K 166960K 27 0 temp 36 6891K 6957K 166960K 5081 0 kqueue 13 20K 26K 166960K 80 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 59 0 56 1 0 1 1 0 8 0 rtentry 112 115 0 13 4 0 4 4 0 8 0 unpcb 144 280 0 265 4 1 3 3 0 8 2 syncache 336 6 0 6 1 1 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 808 142 0 137 4 3 1 4 0 8 0 arp 120 18 0 2 1 0 1 1 0 8 0 ipq 40 4 0 0 1 0 1 1 0 8 0 ipqe 40 9 0 4 1 0 1 1 0 8 0 inpcb 376 536 0 528 11 8 3 11 0 8 2 nd6 136 28 0 4 1 0 1 1 0 8 0 kcovpl 48 28 0 21 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 463 0 49 29 1 28 29 0 8 0 art_table 32 464 0 49 4 0 4 4 0 8 0 art_node 16 114 0 21 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 22 0 12 1 0 1 1 0 8 0 shmpl 112 15 0 1 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 1983 0 460 96 0 96 96 0 8 0 ffsino 280 1983 0 460 109 0 109 109 0 8 0 nchpl 144 2514 0 819 63 0 63 63 0 8 0 uvmvnodes 80 2244 0 0 46 0 46 46 0 8 0 vnodes 216 2244 0 0 125 0 125 125 0 8 0 namei 1024 7809 0 7809 2 1 1 2 0 8 1 percpumem 16 46 0 1 1 0 1 1 0 8 0 kstatmem 264 22 0 2 2 0 2 2 0 8 0 scxspl 216 7502 0 7501 9 8 1 8 1 8 0 plimitpl 152 112 0 89 3 1 2 2 0 8 1 sigapl 424 721 0 670 8 1 7 8 0 8 0 futexpl 64 3351 0 3348 1 0 1 1 0 8 0 knotepl 120 321 0 0 10 0 10 10 0 8 0 kqueuepl 216 89 0 80 1 0 1 1 0 8 0 pipepl 328 186 0 158 3 0 3 3 0 8 0 fdescpl 504 702 0 671 7 2 5 6 0 8 0 filepl 152 3513 0 3314 15 3 12 12 0 8 4 lockfpl 104 60 0 57 1 0 1 1 0 8 0 lockfspl 48 29 0 26 1 0 1 1 0 8 0 sessionpl 144 44 0 29 1 0 1 1 0 8 0 pgrppl 48 75 0 53 1 0 1 1 0 8 0 ucredpl 104 567 0 549 1 0 1 1 0 8 0 zombiepl 144 671 0 670 1 0 1 1 0 8 0 processpl 1168 721 0 670 5 0 5 5 0 8 0 procpl 648 1144 0 1088 6 0 6 6 0 8 0 sosppl 168 2 0 2 2 1 1 1 0 8 1 sockpl 688 882 0 856 17 7 10 12 0 8 7 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 221 0 0 14 0 14 14 0 8 0 bufpl 280 2585 0 123 176 0 176 176 0 8 0 anonpl 24 138217 0 135321 55 8 47 55 0 185 20 amapchunkpl 152 17284 0 16872 28 5 23 27 0 158 2 amappl16 200 2675 0 2654 16 14 2 14 0 8 0 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 165 0 155 1 0 1 1 0 8 0 amappl13 176 39 0 39 1 1 0 1 0 8 0 amappl12 168 1317 0 1286 2 0 2 2 0 8 0 amappl11 160 45 0 35 1 0 1 1 0 8 0 amappl10 152 8 0 8 1 1 0 1 0 8 0 amappl9 144 254 0 253 1 0 1 1 0 8 0 amappl8 136 25 0 23 1 0 1 1 0 8 0 amappl7 128 114 0 104 1 0 1 1 0 8 0 amappl6 120 178 0 175 1 0 1 1 0 8 0 amappl5 112 137 0 130 1 0 1 1 0 8 0 amappl4 104 291 0 277 1 0 1 1 0 8 0 amappl3 96 3084 0 2986 4 0 4 4 0 8 0 amappl2 88 650 0 595 2 0 2 2 0 8 0 amappl1 80 9243 0 8714 14 0 14 14 0 8 0 amappl 88 5026 0 4880 5 0 5 5 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 17 0 1 1 0 1 1 0 8 0 uaddrrnd 24 702 0 671 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 702 0 671 1 0 1 1 0 8 0 vmmpekpl 168 7517 0 7478 3 0 3 3 0 8 0 vmmpepl 168 49838 0 48123 94 7 87 92 0 357 2 vmsppl 456 701 0 671 7 2 5 6 0 8 0 rwobjpl 64 18848 0 15803 50 0 50 50 0 8 0 pdppl 4096 1411 0 1342 131 50 81 97 0 8 12 pvpl 32 15924 0 0 129 0 129 129 0 265 0 pmappl 248 701 0 671 4 1 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 317 0 60 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff8353bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 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(ffffffff835f87c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835f87c0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80003a1aa430,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff835f87c0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835f87c0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 uvm_fault(fffffd806c233ad8,ad7b5eb000,0,1) at uvm_fault+0x1ee sys/uvm/uvm_fault.c:691 upageflttrap(ffff80003a1aa7d0,ad7b5eb000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80003a1aa7d0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x73ca70b6a020, count: -12 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0xa9: movl 0x18(%r14),%r15d ddb{1}> trace witness_checkorder(dead4110dead4230,9,0) at witness_checkorder+0xa9 sys/kern/subr_witness.c:775 mtx_enter(dead4110dead4220) at mtx_enter+0x47 sys/kern/kern_lock.c:238 prsignal(dead4110dead4110,14) at prsignal+0x36 sys/kern/kern_sig.c:908 reaper(ffff8000ffffc008) at reaper+0x32c sys/kern/kern_exit.c:489 end trace frame: 0x0, count: -4