login: witness: lock order reversal: 1st 0xffff800020b8d920 &pr->ps_mtx (&pr->ps_mtx) 2nd 0xffffffff8236c9d8 &sched_lock (&sched_lock) lock order "&sched_lock"(sched_lock) -> "&pr->ps_mtx"(mutex) first seen at: #0 witness_checkorder+0x6a7 sys/kern/subr_witness.c:877 #1 mtx_enter+0x3a sys/kern/kern_lock.c:265 #2 tuagg+0x32 sys/kern/kern_resource.c:360 #3 mi_switch+0x1c7 x86_atomic_clearbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:298 [inline] #3 mi_switch+0x1c7 sys/kern/sched_bsd.c:392 #4 sleep_finish+0x110 sys/kern/kern_synch.c:303 #5 msleep+0x1af sleep_finish_timeout sys/kern/kern_synch.c:327 [inline] #5 msleep+0x1af sleep_finish_all sys/kern/kern_synch.c:157 [inline] #5 msleep+0x1af sys/kern/kern_synch.c:220 #6 scsi_xs_sync+0x14f sys/scsi/scsi_base.c:1339 #7 scsi_start+0x86 sys/scsi/scsi_base.c:938 #8 sdopen+0x22b sys/scsi/sd.c:400 #9 spec_open+0x41c sys/kern/spec_vnops.c:158 #10 VOP_OPEN+0x6a sys/kern/vfs_vops.c:153 #11 sr_meta_native_bootprobe+0xd3 sys/dev/softraid.c:1038 #12 sr_boot_assembly+0x1aa sys/dev/softraid.c:1202 #13 sr_attach+0x183 sys/dev/softraid.c:1822 #14 config_attach+0x347 sys/kern/subr_autoconf.c:404 #15 main+0x6de sys/kern/init_main.c:483 #16 longmode_hi+0x95 lock order "&pr->ps_mtx"(mutex) -> "&sched_lock"(sched_lock) first seen at: #0 witness_checkorder+0x6a7 sys/kern/subr_witness.c:877 #1 __mp_lock+0xa1 #2 schedclock+0x99 sys/kern/sched_bsd.c:547 #3 hardclock+0x1d8 sys/kern/kern_clock.c:174 #4 lapic_clockintr+0x44 sys/arch/amd64/amd64/lapic.c:425 #5 Xresume_lapic_ltimer+0x26 #6 __sanitizer_cov_trace_const_cmp8+0x3a sys/dev/kcov.c:207 #7 exit1+0x6e5 sys/kern/kern_exit.c:292 #8 single_thread_check+0x144 sys/kern/kern_sig.c:1938 #9 userret+0x347 sys/kern/kern_sig.c:1907 #10 syscall+0x614 mi_syscall_return sys/sys/syscall_mi.h:122 [inline] #10 syscall+0x614 sys/arch/amd64/amd64/trap.c:596 #11 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:398 witness_checkorder(ffffffff8236c9d8,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(ffffffff8236c9d8,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1084 __mp_lock(ffffffff8236c7d0) at __mp_lock+0xa1 schedclock(ffff800020b38270) at schedclock+0x99 sys/kern/sched_bsd.c:547 hardclock(ffff8000250572f0) at hardclock+0x1d8 sys/kern/kern_clock.c:174 lapic_clockintr(0,0) at lapic_clockintr+0x44 sys/arch/amd64/amd64/lapic.c:425 Xresume_lapic_ltimer(9,ffffffff81a14970,0,0,0,ffff800020b38270) at Xresume_lapic_ltimer+0x26 __sanitizer_cov_trace_const_cmp8(ffff800020b38270,0) at __sanitizer_cov_trace_const_cmp8+0x3a sys/dev/kcov.c:207 exit1(ffff800020b38270,0,3) at exit1+0x6e5 sys/kern/kern_exit.c:292 single_thread_check(ffff800020b38270,0) at single_thread_check+0x144 sys/kern/kern_sig.c:1938 userret(ffff800020b38270) at userret+0x347 sys/kern/kern_sig.c:1907 syscall(ffff800025057640) at syscall+0x614 mi_syscall_return sys/sys/syscall_mi.h:122 [inline] syscall(ffff800025057640) at syscall+0x614 sys/arch/amd64/amd64/trap.c:596 Xsyscall(6,4,481c5541e60,53,0,481e89ec600) at Xsyscall+0x128 end of kernel end trace frame: 0x48192cb11d0, count: -13 ddb{1}> show registers rdi 0x3 rsi 0xffffffff821c7a20 __sancov_gen_cov_switch_values.122 rbp 0xffff8000250570f0 rbx 0x3 rdx 0xffff800020ab0ff0 rcx 0x3 rax 0xffff800020ab0ff0 r8 0xffffffff813b9985 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0x8b9a8f6fb4074b5a r12 0xfffffd8002662340 r13 0xc r14 0xffffffff8230ae90 w_lodata+0x49850 r15 0xffffffff823189e0 w_lodata+0x573a0 rip 0xffffffff81e8beb8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000250570e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=295544 stat=dead flags process=1010 proc=4082000 pri=72, usrpri=72, nice=20 forw=0xffffffffffffffff, list=0xffffffffffffffff,0xffffffffffffffff process=0xffff800020b8d860 user=0xffff800025052000, vmspace=0xfffffd807effe168 estcpu=22, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 63651 68490 38609 32767 2 0x10 syz-executor.0 63651 361953 38609 32767 3 0x4000090 fsleep syz-executor.0 63651 390097 38609 32767 3 0x4000090 fsleep syz-executor.0 63651 1002 38609 32767 3 0x4000090 fsleep syz-executor.0 16715 247135 2088 32767 7 0x3010 syz-executor.1 2088 330555 84219 32767 3 0x90 nanosleep syz-executor.1 84219 45569 68602 0 3 0x82 wait syz-executor.1 38609 365707 32874 32767 3 0x90 nanosleep syz-executor.0 32874 129513 68602 0 3 0x82 wait syz-executor.0 77053 446466 0 0 3 0x14200 bored sosplice 68602 410823 71730 0 3 0x82 thrsleep syz-fuzzer 68602 262073 71730 0 3 0x4000082 thrsleep syz-fuzzer 68602 5204 71730 0 3 0x4000082 thrsleep syz-fuzzer 68602 507506 71730 0 3 0x4000082 kqread syz-fuzzer 68602 382169 71730 0 3 0x4000082 thrsleep syz-fuzzer 68602 153093 71730 0 3 0x4000082 thrsleep syz-fuzzer 68602 339141 71730 0 3 0x4000082 thrsleep syz-fuzzer 68602 276299 71730 0 3 0x4000082 thrsleep syz-fuzzer 68602 473960 71730 0 3 0x4000082 thrsleep syz-fuzzer 68602 506712 71730 0 3 0x4000082 thrsleep syz-fuzzer 71730 484660 72171 0 3 0x10008a pause ksh 72171 502048 29961 0 3 0x92 select sshd 73191 487746 1 0 3 0x100083 ttyin getty 29961 233919 1 0 3 0x80 select sshd 68610 171549 73718 73 2 0x100090 syslogd 73718 210616 1 0 3 0x100082 netio syslogd 59271 21607 1 77 3 0x100090 poll dhclient 65824 43761 1 0 3 0x80 poll dhclient 13869 208606 0 0 3 0x14200 pgzero zerothread 73514 22932 0 0 3 0x14200 aiodoned aiodoned 30579 226587 0 0 3 0x14200 syncer update 40022 313322 0 0 3 0x14200 cleaner cleaner 38188 467493 0 0 3 0x14200 reaper reaper 62860 464433 0 0 3 0x14200 pgdaemon pagedaemon 38859 55861 0 0 3 0x14200 bored crynlk 47339 356588 0 0 3 0x14200 bored crypto 39334 503930 0 0 3 0x40014200 acpi0 acpi0 54118 393836 0 0 3 0x40014200 idle1 11462 223472 0 0 3 0x14200 bored softnet 8528 242928 0 0 3 0x14200 bored systqmp 47437 394645 0 0 3 0x14200 bored systq 32198 367229 0 0 3 0x40014200 bored softclock 95320 354894 0 0 3 0x40014200 idle0 58837 212993 0 0 3 0x14200 bored smr 1 143881 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &pr->ps_mtx r = 0 (0xffff800020b8d920) #0 witness_lock+0x52e sys/kern/subr_witness.c:1161 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 tuagg+0x32 sys/kern/kern_resource.c:360 #4 exit1+0x6e5 sys/kern/kern_exit.c:292 #5 single_thread_check+0x144 sys/kern/kern_sig.c:1938 #6 userret+0x347 sys/kern/kern_sig.c:1907 #7 syscall+0x614 mi_syscall_return sys/sys/syscall_mi.h:122 [inline] #7 syscall+0x614 sys/arch/amd64/amd64/trap.c:596 #8 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9460 6321K 6321K 78643K 10642 0 0 pcb 23 9K 10K 78643K 488 0 0 rtable 105 3K 3K 78643K 1033 0 0 ifaddr 35 10K 10K 78643K 152 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 44 0 0 iov 0 0K 28K 78643K 79 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1209 76K 76K 78643K 1709 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 9 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 67 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12628 0 0 file desc 8 25K 33K 78643K 1010 0 0 sigio 0 0K 0K 78643K 18 0 0 proc 41 38K 70K 78643K 1133 0 0 subproc 34 2K 2K 78643K 357 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 1 0K 0K 78643K 99 0 0 in_multi 35 2K 2K 78643K 269 0 0 ether_multi 1 0K 0K 78643K 5 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 60 265K 265K 78643K 60 0 0 exec 0 0K 1K 78643K 472 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 90 20K 29K 78643K 4103 0 0 UVM aobj 38 2K 2K 78643K 43 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 0K 78643K 58 0 0 NDP 7 0K 0K 78643K 66 0 0 temp 102 2729K 2796K 78643K 7302 0 0 kqueue 0 0K 0K 78643K 13 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 44 0 38 1 0 1 1 0 8 0 inpcbpl 280 480 0 467 1 0 1 1 0 8 0 plimitpl 152 91 0 82 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 254 0 210 2 0 2 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 180 0 172 1 0 1 1 0 8 0 nd6 48 63 0 57 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1041 0 849 14 1 13 13 0 8 1 art_table 32 1042 0 849 2 0 2 2 0 8 0 art_node 16 253 0 213 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 6 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 63 0 53 1 0 1 1 0 8 0 shmpl 112 41 0 5 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2428 0 1000 47 0 47 47 0 8 0 ffsino 272 2428 0 1000 97 1 96 96 0 8 0 nchpl 144 3772 0 2152 61 0 61 61 0 8 0 uvmvnodes 72 2794 0 0 51 0 51 51 0 8 0 vnodes 200 2794 0 0 148 0 148 148 0 8 0 namei 1024 12913 0 12913 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 10304 0 10304 10 9 1 6 0 8 1 sigapl 432 1124 0 1108 4 2 2 3 0 8 0 futexpl 56 8002 0 7999 1 0 1 1 0 8 0 knotepl 112 708 0 689 1 0 1 1 0 8 0 kqueuepl 104 240 0 238 1 0 1 1 0 8 0 pipepl 112 778 0 759 4 3 1 2 0 8 0 fdescpl 488 1125 0 1108 3 0 3 3 0 8 0 filepl 152 6383 0 6283 6 1 5 5 0 8 1 lockfpl 104 211 0 211 2 1 1 1 0 8 1 lockfspl 48 71 0 71 2 1 1 1 0 8 1 sessionpl 112 36 0 26 1 0 1 1 0 8 0 pgrppl 48 57 0 47 1 0 1 1 0 8 0 ucredpl 96 1690 0 1681 1 0 1 1 0 8 0 zombiepl 144 1109 0 1108 2 1 1 1 0 8 0 processpl 888 1141 0 1108 4 0 4 4 0 8 0 procpl 600 2652 0 2606 4 0 4 4 0 8 0 srpgc 64 114 0 114 3 2 1 1 0 8 1 sosppl 128 17 0 17 2 2 0 1 0 8 0 sockpl 384 959 0 938 3 0 3 3 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 7 0 0 1 0 1 1 0 8 0 mcl9k 9216 7 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 7 0 0 1 0 1 1 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 119 0 0 14 0 14 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 201 0 0 12 0 12 12 0 8 0 bufpl 256 7044 0 1165 368 0 368 368 0 8 0 anonpl 16 119064 0 113564 58 25 33 40 0 125 4 amapchunkpl 152 8259 0 8164 14 5 9 9 0 158 4 amappl16 192 4678 0 4376 48 31 17 28 0 8 0 amappl15 184 83 0 83 2 2 0 1 0 8 0 amappl14 176 299 0 297 2 1 1 1 0 8 0 amappl13 168 257 0 254 2 1 1 1 0 8 0 amappl12 160 81 0 76 1 0 1 1 0 8 0 amappl11 152 153 0 139 1 0 1 1 0 8 0 amappl10 144 109 0 105 1 0 1 1 0 8 0 amappl9 136 828 0 823 1 0 1 1 0 8 0 amappl8 128 345 0 326 1 0 1 1 0 8 0 amappl7 120 114 0 106 1 0 1 1 0 8 0 amappl6 112 111 0 102 1 0 1 1 0 8 0 amappl5 104 322 0 309 1 0 1 1 0 8 0 amappl4 96 1243 0 1220 1 0 1 1 0 8 0 amappl3 88 331 0 319 1 0 1 1 0 8 0 amappl2 80 6816 0 6743 4 2 2 3 0 8 0 amappl1 72 37648 0 37194 25 16 9 19 0 8 0 amappl 80 3157 0 3117 1 0 1 1 0 84 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma64 64 259 0 259 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 17 0 17 1 1 0 1 0 8 0 aobjpl 64 42 0 5 1 0 1 1 0 8 0 uaddrrnd 24 1125 0 1108 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1125 0 1108 1 0 1 1 0 8 0 vmmpekpl 168 13249 0 13222 2 0 2 2 0 8 0 vmmpepl 168 130816 0 129340 106 39 67 81 0 357 2 vmsppl 360 1124 0 1108 2 0 2 2 0 8 0 pdppl 4096 2258 0 2216 6 0 6 6 0 8 0 pvpl 32 359428 0 350640 130 34 96 109 0 265 18 pmappl 232 1124 0 1108 3 2 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 524 0 5 15 0 15 15 0 8 0