login: panic: kernel diagnostic assertion "tname->un_flags & UNVEIL_USERSET" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_unveil.c", line 879 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 264341 59918 32767 0x10 0 0 syz-executor.0 *306894 59918 32767 0x10 0x4000000 1K syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x174 sys/kern/subr_prf.c:208 __assert(ffffffff81f7bdfb,ffffffff81f325a7,36f,ffffffff81f8b7f3) at __assert+0x2e sys/kern/subr_prf.c:155 unveil_check_final(ffff800020b859d8,ffff800020c2b058) at unveil_check_final+0x81d sys/kern/kern_unveil.c:879 namei(ffff800020c2b058) at namei+0x88b sys/kern/vfs_lookup.c:232 dosymlinkat(ffff800020b859d8,20000080,ffffff9c,20000180) at dosymlinkat+0xcd sys/kern/vfs_syscalls.c:1613 syscall(ffff800020c2b310) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c2b310) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,fffffffffffffffd,0,2,1f67c5cd010) at Xsyscall+0x128 end of kernel end trace frame: 0x1f8853df630, count: 7 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic kernel diagnostic assertion "tname->un_flags & UNVEIL_USERSET" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_unveil.c", line 879 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x174 sys/kern/subr_prf.c:208 __assert(ffffffff81f7bdfb,ffffffff81f325a7,36f,ffffffff81f8b7f3) at __assert+0x2e sys/kern/subr_prf.c:155 unveil_check_final(ffff800020b859d8,ffff800020c2b058) at unveil_check_final+0x81d sys/kern/kern_unveil.c:879 namei(ffff800020c2b058) at namei+0x88b sys/kern/vfs_lookup.c:232 dosymlinkat(ffff800020b859d8,20000080,ffffff9c,20000180) at dosymlinkat+0xcd sys/kern/vfs_syscalls.c:1613 syscall(ffff800020c2b310) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c2b310) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,fffffffffffffffd,0,2,1f67c5cd010) at Xsyscall+0x128 end of kernel end trace frame: 0x1f8853df630, count: -8 ddb{1}> show registers rdi 0xffffffff8188e157 db_enter+0x17 rsi 0x3cf3 __ALIGN_SIZE+0x2cf3 rbp 0xffff800020c2adf0 rbx 0xffff800020c2aea0 rdx 0x3cf4 __ALIGN_SIZE+0x2cf4 rcx 0xffff80000114a000 rax 0xffff80000114a000 r8 0xffffffff81e2f083 kprintf+0x183 r9 0x1 r10 0x25 r11 0xe3f75c05a03aeddf r12 0x3000000008 r13 0xffff800020c2ae00 r14 0x100 r15 0x1 rip 0xffffffff8188e158 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c2ade0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=306894 stat=onproc flags process=10 proc=4000000 pri=60, usrpri=60, nice=20 forw=0xffffffffffffffff, list=0xffff800020b85c30,0xffffffff82352f38 process=0xffff800020b3a6a0 user=0xffff800020c26000, vmspace=0xfffffd806e921878 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 59918 264341 56612 32767 7 0x10 syz-executor.0 *59918 306894 56612 32767 7 0x4000010 syz-executor.0 39615 307571 17012 32767 3 0x90 nanosleep syz-executor.1 39615 362494 17012 32767 3 0x4000090 ttyin syz-executor.1 39615 262272 17012 32767 3 0x4000090 fsleep syz-executor.1 17012 206213 92633 32767 3 0x90 nanosleep syz-executor.1 92633 115841 29828 0 3 0x82 wait syz-executor.1 56612 181288 3434 32767 3 0x90 nanosleep syz-executor.0 3434 421910 29828 0 3 0x82 wait syz-executor.0 63197 66903 0 0 3 0x14200 bored sosplice 29828 330151 44049 0 3 0x82 thrsleep syz-fuzzer 29828 524095 44049 0 3 0x4000082 nanosleep syz-fuzzer 29828 241069 44049 0 3 0x4000082 thrsleep syz-fuzzer 29828 284179 44049 0 3 0x4000082 thrsleep syz-fuzzer 29828 68779 44049 0 3 0x4000082 thrsleep syz-fuzzer 29828 387231 44049 0 3 0x4000082 thrsleep syz-fuzzer 29828 286439 44049 0 3 0x4000082 kqread syz-fuzzer 29828 400841 44049 0 3 0x4000082 thrsleep syz-fuzzer 29828 64581 44049 0 3 0x4000082 thrsleep syz-fuzzer 29828 477413 44049 0 3 0x4000082 thrsleep syz-fuzzer 44049 144058 94815 0 3 0x10008a pause ksh 94815 305419 55218 0 3 0x92 select sshd 96420 370658 1 0 3 0x100083 ttyin getty 55218 212607 1 0 3 0x80 select sshd 72448 339257 16474 73 3 0x100090 kqread syslogd 16474 237180 1 0 3 0x100082 netio syslogd 83040 290665 1 77 3 0x100090 poll dhclient 57412 42820 1 0 3 0x80 poll dhclient 73870 477314 0 0 3 0x14200 pgzero zerothread 95174 418822 0 0 3 0x14200 aiodoned aiodoned 114 235333 0 0 3 0x14200 syncer update 26519 334702 0 0 3 0x14200 cleaner cleaner 95923 412990 0 0 3 0x14200 reaper reaper 19955 175750 0 0 3 0x14200 pgdaemon pagedaemon 12692 114328 0 0 3 0x14200 bored crynlk 96489 291950 0 0 3 0x14200 bored crypto 30974 129763 0 0 3 0x40014200 acpi0 acpi0 81155 42602 0 0 3 0x40014200 idle1 30898 523749 0 0 3 0x14200 bored softnet 15778 428085 0 0 3 0x14200 bored systqmp 20623 501371 0 0 3 0x14200 bored systq 60323 343088 0 0 3 0x40014200 bored softclock 71730 218064 0 0 3 0x40014200 idle0 24822 211461 0 0 3 0x14200 bored smr 1 238125 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 59918 (syz-executor.0) thread 0xffff800020b859d8 (306894) exclusive rrwlock inode r = 0 (0xfffffd8069d1cb38) locked @ /syzkaller/managers/setuid/kernel/sys/ufs/ufs/ufs_vnops.c:1547 #0 witness_lock+0x594 sys/kern/subr_witness.c:1201 #1 _rw_enter+0x45d 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 dosymlinkat+0xcd sys/kern/vfs_syscalls.c:1613 #8 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] #8 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82342968) locked @ /syzkaller/managers/setuid/kernel/sys/sys/syscall_mi.h:90 #0 witness_lock+0x594 sys/kern/subr_witness.c:1201 #1 syscall+0x48b mi_syscall sys/sys/syscall_mi.h:91 [inline] #1 syscall+0x48b sys/arch/amd64/amd64/trap.c:574 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9460 6321K 6321K 78643K 10602 0 0 pcb 23 9K 10K 78643K 290 0 0 rtable 97 3K 3K 78643K 523 0 0 ifaddr 35 10K 10K 78643K 106 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 28 0 0 iov 0 0K 20K 78643K 46 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1201 75K 75K 78643K 1455 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 6 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 47 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12628 0 0 file desc 8 25K 33K 78643K 404 0 0 sigio 0 0K 0K 78643K 4 0 0 proc 44 50K 58K 78643K 512 0 0 subproc 68 69634K 69634K 78643K 442 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 48 0 0 in_multi 33 2K 2K 78643K 165 0 0 ether_multi 1 0K 0K 78643K 4 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 240 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 85 20K 29K 78643K 2007 0 0 UVM aobj 14 2K 2K 78643K 16 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 35 0 0 NDP 7 0K 0K 78643K 42 0 0 temp 95 2367K 2432K 78643K 4464 0 0 kqueue 0 0K 0K 78643K 2 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 15 0 11 1 0 1 1 0 8 0 inpcbpl 280 255 0 248 1 0 1 1 0 8 0 plimitpl 152 62 0 53 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 140 0 100 2 0 2 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 28 0 28 1 1 0 1 0 8 0 tcpcb 544 107 0 103 1 0 1 1 0 8 0 nd6 48 26 0 22 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 659 0 471 12 0 12 12 0 8 0 art_table 32 660 0 471 2 0 2 2 0 8 0 art_node 16 139 0 105 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 41 0 31 1 0 1 1 0 8 0 shmpl 112 14 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1863 0 446 46 0 46 46 0 8 0 ffsino 272 1863 0 446 95 0 95 95 0 8 0 nchpl 144 2600 0 987 61 0 61 61 0 8 0 uvmvnodes 72 2093 0 0 39 0 39 39 0 8 0 vnodes 200 2093 0 0 111 0 111 111 0 8 0 namei 1024 7487 0 7485 2 1 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 7308 0 7308 7 6 1 5 0 8 1 sigapl 432 541 0 525 3 1 2 3 0 8 0 futexpl 56 3576 0 3575 1 0 1 1 0 8 0 knotepl 112 350 0 331 1 0 1 1 0 8 0 kqueuepl 104 92 0 90 1 0 1 1 0 8 0 pipepl 112 550 0 531 4 2 2 2 0 8 1 fdescpl 488 542 0 525 3 0 3 3 0 8 0 filepl 152 3457 0 3357 9 4 5 7 0 8 1 lockfpl 104 63 0 63 2 1 1 1 0 8 1 lockfspl 32 95 0 95 2 1 1 1 0 8 1 sessionpl 112 28 0 18 1 0 1 1 0 8 0 pgrppl 48 38 0 28 1 0 1 1 0 8 0 ucredpl 96 706 0 697 1 0 1 1 0 8 0 zombiepl 144 525 0 525 2 1 1 1 0 8 1 processpl 840 558 0 525 4 0 4 4 0 8 0 procpl 600 1235 0 1190 4 0 4 4 0 8 0 srpgc 64 60 0 60 2 1 1 1 0 8 1 sosppl 128 6 0 6 2 1 1 1 0 8 1 sockpl 384 546 0 529 4 1 3 3 0 8 1 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 4 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 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 117 0 0 14 0 14 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 152 0 0 9 0 9 9 0 8 0 bufpl 256 6470 0 1122 335 0 335 335 0 8 0 anonpl 16 62473 0 56680 43 9 34 41 0 125 6 amapchunkpl 152 2948 0 2859 10 5 5 9 0 158 1 amappl16 192 2023 0 1683 29 10 19 29 0 8 1 amappl15 184 55 0 47 1 0 1 1 0 8 0 amappl14 176 167 0 161 2 1 1 1 0 8 0 amappl13 168 47 0 44 1 0 1 1 0 8 0 amappl12 160 115 0 111 1 0 1 1 0 8 0 amappl11 152 58 0 45 1 0 1 1 0 8 0 amappl10 144 72 0 71 2 1 1 1 0 8 0 amappl9 136 682 0 679 1 0 1 1 0 8 0 amappl8 128 318 0 297 1 0 1 1 0 8 0 amappl7 120 57 0 50 1 0 1 1 0 8 0 amappl6 112 92 0 82 1 0 1 1 0 8 0 amappl5 104 173 0 163 1 0 1 1 0 8 0 amappl4 96 665 0 638 2 1 1 2 0 8 0 amappl3 88 319 0 308 1 0 1 1 0 8 0 amappl2 80 3297 0 3235 2 0 2 2 0 8 0 amappl1 72 21430 0 20959 25 15 10 19 0 8 1 amappl 72 1514 0 1476 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 15 0 2 1 0 1 1 0 8 0 uaddrrnd 24 542 0 525 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 542 0 525 1 0 1 1 0 8 0 vmmpekpl 168 8560 0 8535 2 0 2 2 0 8 0 vmmpepl 168 67629 0 66144 98 24 74 75 0 357 9 vmsppl 360 541 0 525 2 0 2 2 0 8 0 pdppl 4096 1092 0 1050 6 0 6 6 0 8 0 pvpl 32 205066 0 195908 122 16 106 113 0 265 24 pmappl 224 541 0 525 3 1 2 2 0 8 1 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 484 0 3 14 0 14 14 0 8 0