witness: acquiring duplicate lock of same type: "&sc->sc_lock" 1st wsmuxlk @ /syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:522 2nd wsmuxlk @ /syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:522 Starting stack trace... witness_checkorder(ffff800000026fd0,1,ffffffff81f33463,20a,0) at witness_checkorder+0xe14 witness_debugger sys/kern/subr_witness.c:2650 [inline] witness_checkorder(ffff800000026fd0,1,ffffffff81f33463,20a,0) at witness_checkorder+0xe14 sys/kern/subr_witness.c:926 _rw_enter_read(ffff800000026fc0,ffffffff81f33463,20a) at _rw_enter_read+0x80 sys/kern/kern_rwlock.c:102 wsmux_do_ioctl(ffff800000026f00,40045714,ffff800020c2dd40,1,ffff800020b43530) at wsmux_do_ioctl+0x4ef wsmux_do_ioctl(ffff800000026d00,40045714,ffff800020c2dd40,1,ffff800020b43530) at wsmux_do_ioctl+0x583 sys/dev/wscons/wsmux.c:531 VOP_IOCTL(fffffd80759bd078,40045714,ffff800020c2dd40,1,fffffd807f7c77e0,ffff800020b43530) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8069147b60,40045714,ffff800020c2dd40,ffff800020b43530) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b43530,ffff800020c2de88,ffff800020c2de70) at sys_ioctl+0x646 syscall(ffff800020c2df20) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c2df20) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff82,0,3,6f4d078f010) at Xsyscall+0x128 end of kernel end trace frame: 0x6f6dcc24fc0, count: 248 End of stack trace. 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:399 witness_checkorder(ffff800000026fd0,1,ffffffff81f33463,20a,0) at witness_checkorder+0xe19 witness_debugger sys/kern/subr_witness.c:2650 [inline] witness_checkorder(ffff800000026fd0,1,ffffffff81f33463,20a,0) at witness_checkorder+0xe19 sys/kern/subr_witness.c:926 _rw_enter_read(ffff800000026fc0,ffffffff81f33463,20a) at _rw_enter_read+0x80 sys/kern/kern_rwlock.c:102 wsmux_do_ioctl(ffff800000026f00,40045714,ffff800020c2dd40,1,ffff800020b43530) at wsmux_do_ioctl+0x4ef wsmux_do_ioctl(ffff800000026d00,40045714,ffff800020c2dd40,1,ffff800020b43530) at wsmux_do_ioctl+0x583 sys/dev/wscons/wsmux.c:531 VOP_IOCTL(fffffd80759bd078,40045714,ffff800020c2dd40,1,fffffd807f7c77e0,ffff800020b43530) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8069147b60,40045714,ffff800020c2dd40,ffff800020b43530) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b43530,ffff800020c2de88,ffff800020c2de70) at sys_ioctl+0x646 syscall(ffff800020c2df20) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c2df20) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff82,0,3,6f4d078f010) at Xsyscall+0x128 end of kernel end trace frame: 0x6f6dcc24fc0, count: -10 ddb{1}> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020c2d8f0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800002b49000 rax 0xffff800001747ac0 r8 0xffffffff818cb2f3 kprintf+0x183 r9 0x1 r10 0x25 r11 0xc4218c297184de6b r12 0xffffffff81f33463 substchar+0x92c4 r13 0x20a r14 0xffffffff81f22d40 cmd680_setup_channel.udma_tbl+0x3c0b r15 0xffffffff81f33463 substchar+0x92c4 rip 0xffffffff811a46a8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c2d8e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=165808 stat=onproc flags process=0 proc=4000000 pri=66, usrpri=66, nice=20 forw=0xffffffffffffffff, list=0xffff800020b42270,0xffffffff8234a810 process=0xffff800020b45708 user=0xffff800020c28000, vmspace=0xfffffd807effe5a0 estcpu=32, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 5086 358495 46121 0 7 0 syz-executor.1 * 5086 165808 46121 0 7 0x4000000 syz-executor.1 54670 312085 0 0 3 0x14200 bored sosplice 46121 242553 51197 0 3 0x82 nanosleep syz-executor.1 67343 487662 51197 0 3 0x2 biowait syz-executor.0 51197 291562 28426 0 3 0x82 thrsleep syz-fuzzer 51197 456414 28426 0 3 0x4000082 nanosleep syz-fuzzer 51197 223610 28426 0 3 0x4000082 thrsleep syz-fuzzer 51197 415691 28426 0 3 0x4000082 thrsleep syz-fuzzer 51197 8921 28426 0 3 0x4000082 thrsleep syz-fuzzer 51197 209023 28426 0 3 0x4000082 thrsleep syz-fuzzer 51197 144119 28426 0 3 0x4000082 thrsleep syz-fuzzer 51197 463021 28426 0 3 0x4000082 thrsleep syz-fuzzer 51197 471791 28426 0 3 0x4000082 thrsleep syz-fuzzer 51197 31075 28426 0 3 0x4000082 kqread syz-fuzzer 28426 235388 17742 0 3 0x10008a pause ksh 17742 213503 44890 0 3 0x92 select sshd 7007 133319 1 0 3 0x100083 ttyin getty 44890 75988 1 0 3 0x80 select sshd 34589 360054 57180 73 2 0x100090 syslogd 57180 399460 1 0 3 0x100082 netio syslogd 18851 190587 1 77 3 0x100090 poll dhclient 38013 186475 1 0 3 0x80 poll dhclient 99333 140045 0 0 3 0x14200 pgzero zerothread 42799 458665 0 0 3 0x14200 aiodoned aiodoned 70796 134360 0 0 3 0x14200 syncer update 13970 319971 0 0 3 0x14200 cleaner cleaner 29779 466592 0 0 3 0x14200 reaper reaper 96718 500743 0 0 3 0x14200 pgdaemon pagedaemon 79555 292604 0 0 3 0x14200 bored crynlk 54693 143111 0 0 3 0x14200 bored crypto 65782 178062 0 0 3 0x40014200 acpi0 acpi0 53076 33118 0 0 3 0x40014200 idle1 21608 15235 0 0 3 0x14200 bored softnet 18007 315748 0 0 3 0x14200 bored systqmp 46532 162281 0 0 3 0x14200 bored systq 17630 82678 0 0 3 0x40014200 bored softclock 33070 116304 0 0 3 0x40014200 idle0 1 202261 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 5086 (syz-executor.1) thread 0xffff800020b43530 (165808) shared rwlock wsmuxlk r = 0 (0xffff800000026dd0) locked @ /syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:522 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 wsmux_do_ioctl+0x4ef #2 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 #3 vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 #4 sys_ioctl+0x646 #5 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #5 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82360c40) locked @ /syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 syscall+0x47f mi_syscall sys/sys/syscall_mi.h:91 [inline] #1 syscall+0x47f sys/arch/amd64/amd64/trap.c:574 #2 Xsyscall+0x128 Process 67343 (syz-executor.0) thread 0xffff800020b24260 (487662) exclusive rrwlock inode r = 0 (0xfffffd80691d11b0) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_ihash.c:140 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 _rw_enter+0x44d sys/kern/kern_rwlock.c:280 #2 _rrw_enter+0x60 sys/kern/kern_rwlock.c:410 #3 ufs_ihashins+0x67 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x13d sys/ufs/ffs/ffs_vfsops.c:1352 #5 ffs_inode_alloc+0x1c3 sys/ufs/ffs/ffs_alloc.c:392 #6 ufs_mkdir+0x10f sys/ufs/ufs/ufs_vnops.c:1164 #7 VOP_MKDIR+0x76 sys/kern/vfs_vops.c:449 #8 domkdirat+0x12d sys/kern/vfs_syscalls.c:2881 #9 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #9 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806a1e24d8) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_vnops.c:1547 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 _rw_enter+0x44d sys/kern/kern_rwlock.c:280 #2 _rrw_enter+0x60 sys/kern/kern_rwlock.c:410 #3 VOP_LOCK+0x57 sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:549 #5 vfs_lookup+0xf5 sys/kern/vfs_lookup.c:387 #6 namei+0x4b2 sys/kern/vfs_lookup.c:224 #7 domkdirat+0x81 sys/kern/vfs_syscalls.c:2866 #8 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #8 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9462 6337K 6337K 78643K 10587 0 0 pcb 23 9K 10K 78643K 105 0 0 rtable 100 3K 4K 78643K 206 0 0 ifaddr 35 10K 10K 78643K 58 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 15 0 0 iov 0 0K 12K 78643K 2 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1196 75K 75K 78643K 1259 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 21 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 5 13K 25K 78643K 110 0 0 proc 41 38K 70K 78643K 271 0 0 subproc 64 65538K 67586K 78643K 68 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 16 0 0 in_multi 33 2K 2K 78643K 43 0 0 ether_multi 1 0K 0K 78643K 2 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 66 291K 291K 78643K 66 0 0 exec 0 0K 1K 78643K 174 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 80 20K 21K 78643K 1080 0 0 UVM aobj 6 2K 2K 78643K 6 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 NDP 5 0K 0K 78643K 15 0 0 temp 88 2354K 2418K 78643K 3064 0 0 kqueue 0 0K 0K 78643K 1 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 4 0 0 1 0 1 1 0 8 0 inpcbpl 280 81 0 74 1 0 1 1 0 8 0 plimitpl 152 16 0 9 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 41 0 1 2 0 2 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 24 0 20 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 4 0 4 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 185 0 0 12 0 12 12 0 8 0 art_table 32 186 0 0 2 0 2 2 0 8 0 art_node 16 40 0 6 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semapl 112 19 0 9 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1616 0 205 46 0 46 46 0 8 0 ffsino 272 1616 0 205 95 0 95 95 0 8 0 nchpl 144 1978 0 359 61 0 61 61 0 8 0 uvmvnodes 72 1660 0 0 31 0 31 31 0 8 0 vnodes 200 1660 0 0 88 0 88 88 0 8 0 namei 1024 4883 0 4882 2 1 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 0 1 1 0 8 1 scxspl 192 4747 0 4746 7 6 1 6 0 8 0 sigapl 432 278 0 265 2 0 2 2 0 8 0 futexpl 56 1181 0 1181 1 0 1 1 0 8 1 knotepl 112 80 0 53 2 1 1 2 0 8 0 kqueuepl 104 28 0 26 1 0 1 1 0 8 0 pipepl 112 226 0 207 3 1 2 2 0 8 1 fdescpl 488 279 0 265 3 1 2 3 0 8 0 filepl 152 1541 0 1446 6 1 5 5 0 8 1 lockfpl 104 46 0 45 2 1 1 1 0 8 0 lockfspl 32 39 0 38 2 1 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 17 0 7 1 0 1 1 0 8 0 ucredpl 96 240 0 233 1 0 1 1 0 8 0 zombiepl 144 265 0 265 2 1 1 1 0 8 1 processpl 840 294 0 265 4 0 4 4 0 8 0 procpl 600 509 0 470 4 0 4 4 0 8 0 sosppl 128 4 0 4 1 0 1 1 0 8 1 sockpl 384 161 0 144 3 0 3 3 0 8 1 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 114 0 0 14 0 14 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 126 0 0 8 0 8 8 0 8 0 bufpl 256 5379 0 1015 273 0 273 273 0 8 0 anonpl 16 38206 0 30603 48 1 47 47 0 125 16 amapchunkpl 152 1299 0 1213 9 0 9 9 0 158 4 amappl16 192 1134 0 733 32 4 28 32 0 8 7 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 8 0 6 2 1 1 1 0 8 0 amappl13 168 65 0 61 1 0 1 1 0 8 0 amappl12 160 4 0 3 2 1 1 1 0 8 0 amappl11 152 178 0 169 1 0 1 1 0 8 0 amappl10 144 109 0 106 2 1 1 1 0 8 0 amappl9 136 363 0 359 1 0 1 1 0 8 0 amappl8 128 128 0 113 1 0 1 1 0 8 0 amappl7 120 41 0 34 1 0 1 1 0 8 0 amappl6 112 55 0 47 1 0 1 1 0 8 0 amappl5 104 104 0 93 1 0 1 1 0 8 0 amappl4 96 303 0 280 2 1 1 2 0 8 0 amappl3 88 128 0 122 1 0 1 1 0 8 0 amappl2 80 1558 0 1504 2 0 2 2 0 8 0 amappl1 72 14342 0 13925 24 14 10 19 0 8 0 amappl 72 714 0 681 1 0 1 1 0 75 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 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 279 0 265 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 279 0 265 1 0 1 1 0 8 0 vmmpekpl 168 6085 0 6064 2 0 2 2 0 8 0 vmmpepl 168 36243 0 34908 82 9 73 73 0 357 13 vmsppl 360 278 0 265 2 0 2 2 0 8 0 pdppl 4096 566 0 530 6 1 5 6 0 8 0 pvpl 32 128639 0 118082 129 8 121 121 0 265 34 pmappl 224 278 0 265 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 420 0 4 12 0 12 12 0 8 0