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}> 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:904 reaper(ffff807fffffd9f8) at reaper+0x2ec sys/kern/kern_exit.c:516 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a1e4950 rbx 0 rdx 0 rcx 0xffff807fffffd9f8 rax 0xffff80002998dffe r8 0x7f7fffffc000 r9 0x1 r10 0x86fc4b68ee7fc771 r11 0x5832803da036884f r12 0xdead4110dead42fe r13 0x9 r14 0xdead4110dead4228 r15 0 rip 0xffffffff827e76c5 witness_checkorder+0xb5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a1e48b0 ss 0x10 witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{1}> show proc PROC (reaper) tid=349660 pid=84860 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=0xffff807ffffffc88,0xffff807fffffca78 process=0xffff807fffffb4f0 user=0xffff80002a1df000, vmspace=0xffffffff83a77a98 estcpu=0, cpticks=14, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 38950 90393 23010 32767 2 0x10 syz-executor 62702 293395 87646 32767 7 0x10 syz-executor 62702 367688 87646 32767 3 0x4000090 kqread syz-executor 62702 472477 87646 32767 3 0x4000090 kqread syz-executor 19182 362298 67977 32767 2 0x82010 syz-executor 19182 161847 67977 32767 3 0x4002010 suspend syz-executor 13410 485622 6924 32767 2 0x10 syz-executor 13410 461268 6924 32767 3 0x4000090 fsleep syz-executor 47710 457313 22823 32767 2 0x10 syz-executor 47710 313782 22823 32767 3 0x4000010 biowait syz-executor 47710 497192 22823 32767 3 0x4000090 fsleep syz-executor 43542 235163 51697 32767 3 0x90 piperd syz-executor 87646 68783 76381 32767 3 0x90 nanoslp syz-executor 23010 225684 57627 32767 2 0x10 syz-executor 66849 305928 9461 32767 3 0x10 biowait syz-executor 67977 402296 97030 32767 3 0x90 nanoslp syz-executor 6924 522063 47329 32767 3 0x90 nanoslp syz-executor 22823 444382 63875 32767 3 0x90 nanoslp syz-executor 57627 488606 18452 0 3 0x82 wait syz-executor 76381 407827 18452 0 3 0x82 wait syz-executor 97030 180544 18452 0 3 0x82 wait syz-executor 9461 142285 18452 0 3 0x82 wait syz-executor 51697 206786 18452 0 3 0x82 wait syz-executor 47329 28112 18452 0 3 0x82 wait syz-executor 63875 144523 18452 0 3 0x82 wait syz-executor 18452 509101 35175 0 3 0x82 nanoslp syz-executor 35175 407816 64281 0 3 0x10008a sigsusp ksh 64281 76439 79914 0 3 0x98 kqread sshd-session 79914 379705 4480 0 3 0x92 kqread sshd-session 31352 379606 1 0 3 0x100083 ttyin getty 4480 172289 1 0 3 0x88 kqread sshd 78646 104883 36129 73 3 0x1100090 kqread syslogd 36129 414364 1 0 3 0x100082 sbwait syslogd 98267 384110 1 0 3 0x100080 kqread resolvd 19465 286194 63395 77 3 0x100092 kqread dhcpleased 33990 477780 63395 77 3 0x100092 kqread dhcpleased 63395 235260 1 0 3 0x80 kqread dhcpleased 25454 291869 0 0 3 0x14200 bored smr 15721 368596 0 0 2 0x14200 zerothread 91829 519776 0 0 3 0x14200 aiodoned aiodoned 38243 327740 0 0 3 0x14200 syncer update 12237 338496 0 0 3 0x14200 cleaner cleaner *84860 349660 0 0 7 0x14200 reaper 1115 357315 0 0 3 0x14200 pgdaemon pagedaemon 52322 277874 0 0 3 0x14200 bored viomb 48888 421629 0 0 3 0x40014200 acpi0 acpi0 92384 169563 0 0 3 0x40014200 idle1 18032 147060 0 0 3 0x14200 bored softnet1 25953 250580 0 0 3 0x14200 bored softnet0 41215 38605 0 0 3 0x14200 smrbar systqmp 17084 298185 0 0 3 0x14200 bored systq 83570 326196 0 0 3 0x14200 tmoslp softclockmp 68750 448543 0 0 3 0x40014200 tmoslp softclock 47640 61340 0 0 3 0x40014200 idle0 1 25014 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 47710 (syz-executor) thread 0xffff80003a3a8020 (313782) exclusive rrwlock inode r = 0 (0xfffff400453cf570) #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_relookup+0x5c sys/kern/vfs_lookup.c:802 #6 ufs_rename+0x14aa sys/ufs/ufs/ufs_vnops.c:1007 #7 VOP_RENAME+0x137 sys/kern/vfs_vops.c:376 #8 dorenameat+0x3f7 sys/kern/vfs_syscalls.c:2983 #9 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #10 Xsyscall+0x128 Process 66849 (syz-executor) thread 0xffff807ffffeed10 (305928) exclusive rrwlock inode r = 0 (0xfffff400453cf0d0) #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 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580 #11 namei+0x7c5 sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffff4006a9847a0) #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+0x7c5 sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 Process 84860 (reaper) thread 0xffff807fffffd9f8 (349660) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839e2700) #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:513 #6 proc_trampoline+0x10 Process 41215 (systqmp) thread 0xffff807fffffea60 (38605) shared rwlock systqmp r = 0 (0xffffffff8392c368) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11050 12016K 12034K 166960K 12144 0 pcb 17 12K 12K 166960K 17 0 rtable 219 6K 7K 166960K 378 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 9K 166960K 7 0 counters 68 36K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 44 0 iov 0 0K 16K 166960K 12 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1287 81K 81K 166960K 1557 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 16 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 21 77K 117K 166960K 470 0 sigio 0 0K 0K 166960K 11 0 proc 58 99K 147K 166960K 531 0 subproc 63 3K 4K 166960K 243 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 172 0 in_multi 88 6K 7K 166960K 112 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 17 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 413 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 222 159K 217K 166960K 5807 0 UVM aobj 18 2K 2K 166960K 19 0 pinsyscall 42 84K 110K 166960K 1610 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 13 0 NDP 10 0K 2K 166960K 27 0 temp 69 9123K 9140K 166960K 4730 0 kqueue 15 22K 34K 166960K 91 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 129 0 126 3 2 1 3 0 8 0 rtentry 176 116 0 15 6 1 5 6 0 8 0 unpcb 144 400 0 385 6 5 1 6 0 8 0 syncache 336 10 0 10 2 1 1 1 0 8 1 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 181 0 175 7 5 2 7 0 8 0 arp 136 18 0 2 1 0 1 1 0 8 0 ipq 40 4 0 1 1 0 1 1 0 8 0 ipqe 40 8 0 4 1 0 1 1 0 8 0 inpcb 328 377 0 367 8 6 2 8 0 8 0 nd6 152 29 0 6 1 0 1 1 0 8 0 kcovpl 48 27 0 20 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 504 0 74 30 2 28 30 0 8 0 art_table 40 505 0 74 5 0 5 5 0 8 0 art_node 32 116 0 23 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 0 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 11 0 1 1 0 1 1 0 8 0 shmpl 112 16 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1956 0 471 93 0 93 93 0 8 0 ffsino 296 1956 0 471 115 0 115 115 0 8 0 nchpl 144 2515 0 805 64 0 64 64 0 8 0 vnodes 216 2208 0 0 123 0 123 123 0 8 0 namei 1024 8207 0 8205 1 0 1 1 0 8 0 percpumem 16 50 0 1 1 0 1 1 0 8 0 kstatmem 264 25 0 2 2 0 2 2 0 8 0 scxspl 216 9100 0 9098 11 8 3 8 1 8 2 plimitpl 152 217 0 195 2 1 1 2 0 8 0 sigapl 424 739 0 690 7 1 6 7 0 8 0 knotepl 120 427 0 0 13 0 13 13 0 8 0 kqueuepl 224 96 0 86 2 1 1 2 0 8 0 pipepl 344 244 0 217 6 3 3 6 0 8 0 fdescpl 528 723 0 690 3 0 3 3 0 8 0 filepl 160 3888 0 3693 19 9 10 19 0 8 1 lockfpl 104 87 0 85 1 0 1 1 0 8 0 lockfspl 48 35 0 33 1 0 1 1 0 8 0 sessionpl 144 61 0 46 1 0 1 1 0 8 0 pgrppl 48 91 0 69 1 0 1 1 0 8 0 ucredpl 104 554 0 536 1 0 1 1 0 8 0 zombiepl 144 690 0 690 1 0 1 1 0 8 1 processpl 1232 739 0 690 5 0 5 5 0 8 0 procpl 664 1188 0 1133 7 1 6 7 0 8 1 sosppl 176 3 0 3 1 1 0 1 0 8 0 sockpl 752 906 0 878 25 21 4 25 0 8 0 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 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 119 0 0 15 0 15 15 0 8 0 mcl2k 2048 20 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1213 0 0 76 0 76 76 0 8 0 bufpl 272 2866 0 102 185 0 185 185 0 8 0 anonpl 32 7332 0 0 60 0 60 60 0 115 0 amapchunkpl 152 19149 0 18685 39 13 26 39 0 158 4 amappl16 200 2251 0 2231 13 10 3 13 0 8 0 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 427 0 426 1 0 1 1 0 8 0 amappl13 176 128 0 118 1 0 1 1 0 8 0 amappl12 168 1011 0 980 2 0 2 2 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 62 0 52 1 0 1 1 0 8 0 amappl9 144 271 0 271 1 1 0 1 0 8 0 amappl8 136 101 0 99 1 0 1 1 0 8 0 amappl7 128 150 0 138 1 0 1 1 0 8 0 amappl6 120 246 0 245 1 0 1 1 0 8 0 amappl5 112 124 0 116 1 0 1 1 0 8 0 amappl4 104 294 0 279 1 0 1 1 0 8 0 amappl3 96 3248 0 3139 5 1 4 4 0 8 0 amappl2 88 579 0 525 2 0 2 2 0 8 0 amappl1 80 12749 0 12194 20 5 15 19 0 8 0 amappl 88 4993 0 4834 5 0 5 5 0 92 0 uvmvnodes 80 116 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 18 0 1 1 0 1 1 0 8 0 uaddrrnd 24 723 0 690 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 723 0 690 1 0 1 1 0 8 0 vmmpekpl 168 8671 0 8633 3 0 3 3 0 8 1 vmmpepl 168 56856 0 54996 113 12 101 113 0 357 12 vmsppl 488 722 0 690 7 2 5 6 0 8 0 rwobjpl 80 18977 0 18046 30 4 26 30 0 8 0 pdppl 4096 1453 0 1380 129 48 81 93 0 8 8 pvpl 32 14541 0 0 118 0 118 118 0 265 0 pmappl 256 722 0 690 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 555 0 59 15 0 15 15 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff839d9ff0) 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(ffffffff839e1f00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839e1f00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff8000387b3300,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_switch(0,ffffffff838dd990) at __sanitizer_cov_trace_switch+0x46 sys/dev/kcov.c:-1 syscall(ffff8000387b34b0) at syscall+0x8ec sys/arch/amd64/amd64/trap.c:785 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70ea376e1960, count: -9 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:904 reaper(ffff807fffffd9f8) at reaper+0x2ec sys/kern/kern_exit.c:516 end trace frame: 0x0, count: -4