witness: lock order reversal: 1st 0xffff800020b8d5a8 &pr->ps_mtx (&pr->ps_mtx) 2nd 0xffffffff82384c80 &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 calcru+0x1dd sys/kern/kern_resource.c:422 #7 exit1+0x737 sys/kern/kern_exit.c:301 #8 sys_exit+0x17 sys/kern/kern_exit.c:94 #9 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] #9 syscall+0x552 sys/arch/amd64/amd64/trap.c:574 #10 Xsyscall+0x128 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 witness_checkorder(ffffffff82384c80,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(ffffffff82384c80,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1084 __mp_lock(ffffffff82384a78) at __mp_lock+0xa1 schedclock(ffff800020b38018) at schedclock+0x99 sys/kern/sched_bsd.c:547 hardclock(ffff800023c56fd0) 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,fffffd806d99ad98,0,0,0,0) at Xresume_lapic_ltimer+0x26 calcru(ffff800020b8d610,fffffd806d99ad88,fffffd806d99ad98,0) at calcru+0x1dd sys/kern/kern_resource.c:422 exit1(ffff800020b38018,0,1) at exit1+0x737 sys/kern/kern_exit.c:301 sys_exit(ffff800020b38018,ffff800023c571e0,ffff800023c57250) at sys_exit+0x17 sys/kern/kern_exit.c:94 syscall(ffff800023c572c0) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800023c572c0) at syscall+0x552 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,1,0,1,0,7f7fffff2664) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff2630, count: -12 ddb{0}> show registers rdi 0x3 rsi 0xffffffff821fc9e0 __sancov_gen_cov_switch_values.122 rbp 0xffff800023c56dd0 rbx 0x3 rdx 0xffffffff821baff0 cpu_info_full_primary+0x1ff0 rcx 0x3 rax 0xffffffff821baff0 cpu_info_full_primary+0x1ff0 r8 0xffffffff818c8c95 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0xc12458178546d76 r12 0xfffffd8002661340 r13 0xc r14 0xffffffff82330690 w_lodata+0x45440 r15 0xffffffff823423e0 w_lodata+0x57190 rip 0xffffffff81a42468 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023c56dc0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=35101 stat=dead flags process=1018 proc=2000 pri=50, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffffffffffffffff,0xffffffffffffffff process=0xffff800020b8d4e8 user=0xffff800023c52000, vmspace=0xfffffd807effd9d8 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 45017 486090 1 0 3 0x100083 ttyopn getty 24516 105183 0 0 3 0x14200 bored sosplice 36886 494725 21844 0 3 0x82 nanosleep syz-executor.1 51599 145851 21844 0 2 0x2 syz-executor.0 21844 233781 71493 0 3 0x82 kqread syz-fuzzer 21844 177915 71493 0 3 0x4000082 nanosleep syz-fuzzer 21844 394067 71493 0 3 0x4000082 thrsleep syz-fuzzer 21844 407326 71493 0 3 0x4000082 thrsleep syz-fuzzer 21844 227306 71493 0 3 0x4000082 thrsleep syz-fuzzer 21844 284825 71493 0 3 0x4000082 thrsleep syz-fuzzer 21844 161958 71493 0 3 0x4000082 thrsleep syz-fuzzer 21844 457370 71493 0 3 0x4000082 thrsleep syz-fuzzer 21844 132922 71493 0 3 0x4000082 nanosleep syz-fuzzer 21844 208025 71493 0 3 0x4000082 thrsleep syz-fuzzer 71493 108326 5408 0 3 0x10008a pause ksh 5408 73846 70272 0 3 0x92 select sshd 70272 512121 1 0 3 0x80 select sshd 48943 30950 2209 74 3 0x100092 bpf pflogd 2209 376774 1 0 3 0x80 netio pflogd 8224 473027 24314 73 2 0x100090 syslogd 24314 378511 1 0 3 0x100082 netio syslogd 86291 113776 1 77 3 0x100090 poll dhclient 52650 62011 1 0 3 0x80 poll dhclient 92028 171739 0 0 2 0x14200 zerothread 92851 243138 0 0 3 0x14200 aiodoned aiodoned 51228 258126 0 0 3 0x14200 syncer update 79638 450413 0 0 3 0x14200 cleaner cleaner 77151 495496 0 0 7 0x14200 reaper 53129 327999 0 0 3 0x14200 pgdaemon pagedaemon 24668 404858 0 0 3 0x14200 bored crynlk 80290 491895 0 0 3 0x14200 bored crypto 47835 125174 0 0 3 0x40014200 acpi0 acpi0 5228 518654 0 0 3 0x40014200 idle1 52680 312255 0 0 3 0x14200 bored softnet 14810 89916 0 0 3 0x14200 bored systqmp 1873 189073 0 0 3 0x14200 bored systq 48443 203697 0 0 3 0x40014200 bored softclock 78179 62306 0 0 3 0x40014200 idle0 14604 170939 0 0 3 0x14200 bored smr 1 361578 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &pr->ps_mtx r = 0 (0xffff800020b8d5a8) #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 exit1+0x722 sys/kern/kern_exit.c:300 #4 sys_exit+0x17 sys/kern/kern_exit.c:94 #5 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] #5 syscall+0x552 sys/arch/amd64/amd64/trap.c:574 #6 Xsyscall+0x128 Process 51599 (syz-executor.0) thread 0xffff800020b14968 (145851) exclusive rrwlock inode r = 0 (0xfffffd807d1285f8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1161 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x133 sys/ufs/ffs/ffs_vfsops.c:1352 #5 ffs_inode_alloc+0x1cf sys/ufs/ffs/ffs_alloc.c:392 #6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1164 #7 VOP_MKDIR+0x6a sys/kern/vfs_vops.c:449 #8 domkdirat+0x121 sys/kern/vfs_syscalls.c:2974 #9 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] #9 syscall+0x552 sys/arch/amd64/amd64/trap.c:574 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8069a21810) #0 witness_lock+0x52e sys/kern/subr_witness.c:1161 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:549 #5 vfs_lookup+0xe9 sys/kern/vfs_lookup.c:422 #6 namei+0x61c sys/kern/vfs_lookup.c:252 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:2959 #8 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] #8 syscall+0x552 sys/arch/amd64/amd64/trap.c:574 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9510 6419K 7056K 78643K 12218 0 0 pcb 25 9K 10K 78643K 413 0 0 rtable 111 4K 5K 78643K 383 0 0 ifaddr 57 13K 13K 78643K 139 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1491 0 0 iov 0 0K 16K 78643K 69 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1210 76K 76K 78643K 1840 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 12 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 64 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12628 0 0 file desc 4 9K 25K 78643K 1535 0 0 sigio 0 0K 0K 78643K 12 0 0 proc 54 51K 71K 78643K 465 0 0 subproc 32 2K 2K 78643K 37 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 77 0 0 in_multi 33 2K 2K 78643K 51 0 0 ether_multi 1 0K 0K 78643K 2 0 0 mrt 0 0K 0K 78643K 1 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 264 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 91 20K 30K 78643K 5556 0 0 UVM aobj 40 2K 2K 78643K 44 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 42 0 0 NDP 11 0K 0K 78643K 35 0 0 temp 167 2735K 2809K 78643K 7158 0 0 kqueue 0 0K 0K 78643K 4 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 6 0 0 1 0 1 1 0 8 0 inpcbpl 280 377 0 370 1 0 1 1 0 8 0 plimitpl 152 39 0 31 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 51 0 7 2 0 2 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 129 0 125 1 0 1 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 ppxss 1128 17 0 17 4 3 1 1 0 8 1 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 19 0 10 1 0 1 1 0 8 0 pfstkey 112 19 0 10 1 0 1 1 0 8 0 pfstate 328 19 0 10 2 0 2 2 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 188 0 0 12 0 12 12 0 8 0 art_table 32 189 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 35 0 30 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 62 0 52 1 0 1 1 0 8 0 shmpl 112 42 0 4 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 4157 0 2730 47 0 47 47 0 8 0 ffsino 272 4157 0 2730 96 0 96 96 0 8 0 nchpl 144 6894 0 5252 62 1 61 62 0 8 0 uvmvnodes 72 4579 0 0 84 0 84 84 0 8 0 vnodes 200 4579 0 0 241 0 241 241 0 8 0 namei 1024 17401 0 17400 2 1 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 17798 0 17798 10 9 1 6 0 8 1 sigapl 432 1736 0 1721 3 1 2 3 0 8 0 futexpl 56 14919 0 14919 1 0 1 1 0 8 1 knotepl 112 160 0 141 1 0 1 1 0 8 0 kqueuepl 104 157 0 155 1 0 1 1 0 8 0 pipepl 112 596 0 577 2 1 1 1 0 8 0 fdescpl 488 1737 0 1722 3 0 3 3 0 8 0 filepl 152 7606 0 7507 5 0 5 5 0 8 1 lockfpl 104 204 0 204 2 1 1 1 0 8 1 lockfspl 48 75 0 75 2 1 1 1 0 8 1 sessionpl 112 19 0 8 1 0 1 1 0 8 0 pgrppl 48 35 0 24 1 0 1 1 0 8 0 ucredpl 96 1081 0 1071 1 0 1 1 0 8 0 zombiepl 144 1722 0 1721 2 1 1 1 0 8 0 processpl 888 1753 0 1721 4 0 4 4 0 8 0 procpl 600 4786 0 4744 4 0 4 4 0 8 0 sosppl 128 6 0 6 2 2 0 1 0 8 0 sockpl 384 715 0 696 3 0 3 3 0 8 1 mcl64k 65536 10 0 0 2 0 2 2 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 8 0 0 1 0 1 1 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 130 0 0 16 0 16 16 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 155 0 0 9 0 9 9 0 8 0 bufpl 256 8433 0 1425 439 0 439 439 0 8 0 anonpl 16 136647 0 126391 78 20 58 58 0 125 16 amapchunkpl 152 8857 0 8761 12 7 5 11 0 158 0 amappl16 192 7521 0 6972 53 17 36 39 0 8 8 amappl15 184 9 0 7 1 0 1 1 0 8 0 amappl14 176 40 0 37 2 1 1 1 0 8 0 amappl13 168 704 0 702 2 1 1 1 0 8 0 amappl12 160 14 0 12 1 0 1 1 0 8 0 amappl11 152 63 0 45 1 0 1 1 0 8 0 amappl10 144 877 0 870 1 0 1 1 0 8 0 amappl9 136 595 0 592 1 0 1 1 0 8 0 amappl8 128 139 0 124 1 0 1 1 0 8 0 amappl7 120 834 0 829 1 0 1 1 0 8 0 amappl6 112 62 0 54 1 0 1 1 0 8 0 amappl5 104 122 0 107 1 0 1 1 0 8 0 amappl4 96 1909 0 1880 1 0 1 1 0 8 0 amappl3 88 218 0 207 1 0 1 1 0 8 0 amappl2 80 13708 0 13635 4 1 3 3 0 8 0 amappl1 72 44776 0 44330 25 15 10 20 0 8 0 amappl 80 5031 0 4993 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 43 0 4 1 0 1 1 0 8 0 uaddrrnd 24 1737 0 1721 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1737 0 1721 1 0 1 1 0 8 0 vmmpekpl 168 16012 0 15983 2 0 2 2 0 8 0 vmmpepl 168 187538 0 185923 117 33 84 88 0 357 10 vmsppl 360 1736 0 1721 2 0 2 2 0 8 0 pdppl 4096 3482 0 3442 6 0 6 6 0 8 0 pvpl 32 419110 0 405642 185 38 147 147 0 265 37 pmappl 232 1736 0 1721 2 1 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 594 0 4 17 0 17 17 0 8 0