panic: kernel diagnostic apanic: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_fork.c", line 689 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *524224 90053 32767 0x10 0 1 syz-executor.0 64283 12052 32767 0x10 0x4000000 0 syz-executor.1 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(ffffffff81f7f998,ffffffff81f5634c,2b1,ffffffff81f511c6) at __assert+0x2e sys/kern/subr_prf.c:155 proc_trampoline_mp() at proc_trampoline_mp+0x13b end trace frame: 0x0, count: 11 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(ffffffff81f7f998,ffffffff81f5634c,2b1,ffffffff81f511c6) at __assert+0x2e sys/kern/subr_prf.c:155 proc_trampoline_mp() at proc_trampoline_mp+0x13b end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020c3f8b0 rbx 0xffff800020c3f960 rdx 0xffffffff81f24c5a cmd0646_9_tim_udma+0x19b76 rcx 0 rax 0 r8 0xffffffff81d729c3 kprintf+0x183 r9 0x1 r10 0x25 r11 0x167ff013e2e222ba r12 0x3000000008 r13 0xffff800020c3f8c0 r14 0x104 r15 0x1 rip 0xffffffff815e48a8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c3f8a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=524224 stat=onproc flags process=10 proc=0 pri=53, usrpri=53, nice=20 forw=0xffffffffffffffff, list=0xffff800020b28e28,0xffffffff8235ded8 process=0xffff800020b7c6a8 user=0xffff800020c3a000, vmspace=0xfffffd807effeb40 estcpu=9, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *90053 524224 17134 32767 7 0x10 syz-executor.0 12052 438956 60217 32767 2 0x10 syz-executor.1 12052 64283 60217 32767 7 0x4000010 syz-executor.1 60217 521628 12708 32767 3 0x90 nanosleep syz-executor.1 12708 348571 30887 0 3 0x82 wait syz-executor.1 17134 23716 84673 32767 2 0x10 syz-executor.0 84673 346855 30887 0 3 0x82 wait syz-executor.0 30887 272033 13573 0 3 0x82 thrsleep syz-fuzzer 30887 343892 13573 0 3 0x4000082 nanosleep syz-fuzzer 30887 107555 13573 0 3 0x4000082 thrsleep syz-fuzzer 30887 285864 13573 0 3 0x4000082 thrsleep syz-fuzzer 30887 72834 13573 0 3 0x4000082 thrsleep syz-fuzzer 30887 235586 13573 0 3 0x4000082 thrsleep syz-fuzzer 30887 373982 13573 0 3 0x4000082 thrsleep syz-fuzzer 30887 440544 13573 0 3 0x4000082 thrsleep syz-fuzzer 30887 117162 13573 0 3 0x4000082 thrsleep syz-fuzzer 30887 72173 13573 0 2 0x4000082 syz-fuzzer 13573 435728 62233 0 3 0x10008a pause ksh 62233 291553 95938 0 3 0x92 select sshd 12489 281617 1 0 3 0x100083 ttyin getty 95938 403062 1 0 3 0x80 select sshd 26173 198625 36742 73 3 0x100090 kqread syslogd 36742 304563 1 0 3 0x100082 netio syslogd 89893 176778 1 77 3 0x100090 poll dhclient 80254 75796 1 0 3 0x80 poll dhclient 75709 485843 0 0 3 0x14200 pgzero zerothread 84578 283 0 0 3 0x14200 aiodoned aiodoned 17336 441535 0 0 3 0x14200 syncer update 40585 369975 0 0 3 0x14200 cleaner cleaner 61352 123667 0 0 3 0x14200 reaper reaper 3943 450309 0 0 3 0x14200 pgdaemon pagedaemon 31446 309145 0 0 3 0x14200 bored crynlk 17043 302429 0 0 3 0x14200 bored crypto 39912 451179 0 0 3 0x40014200 acpi0 acpi0 19936 238821 0 0 3 0x40014200 idle1 48106 21193 0 0 3 0x14200 bored softnet 22092 337096 0 0 3 0x14200 bored systqmp 65093 91084 0 0 3 0x14200 bored systq 4518 169256 0 0 3 0x40014200 bored softclock 42616 451123 0 0 3 0x40014200 idle0 13503 139842 0 0 3 0x14200 bored smr 1 117537 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 12052 (syz-executor.1) thread 0xffff800020b28e28 (64283) exclusive rrwlock inode r = 0 (0xfffffd8077e5c2c0) 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 vget+0x1c3 sys/kern/vfs_subr.c:672 #6 cache_lookup+0x300 sys/kern/vfs_cache.c:224 #7 ufs_lookup+0x1d7 sys/ufs/ufs/ufs_lookup.c:162 #8 VOP_LOOKUP+0x67 sys/kern/vfs_vops.c:90 #9 vfs_lookup+0x556 sys/kern/vfs_lookup.c:523 #10 namei+0x4b2 sys/kern/vfs_lookup.c:224 #11 domkdirat+0x81 sys/kern/vfs_syscalls.c:2866 #12 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] #12 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 #13 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8236d8b0) 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 Process 17134 (syz-executor.0) thread 0xffff800020b059d0 (23716) exclusive rrwlock inode r = 0 (0xfffffd8077e5cb40) locked @ /syzkaller/managers/setuid/kernel/sys/ufs/ufs/ufs_ihash.c:140 #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 ufs_ihashins+0x6d sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x143 sys/ufs/ffs/ffs_vfsops.c:1352 #5 ffs_inode_alloc+0x1cf 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+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] #9 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8069d2c2b8) 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 domkdirat+0x81 sys/kern/vfs_syscalls.c:2866 #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9456 6320K 6320K 78643K 10543 0 0 pcb 23 9K 10K 78643K 87 0 0 rtable 97 3K 3K 78643K 167 0 0 ifaddr 34 9K 9K 78643K 34 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 15 0 0 iov 0 0K 0K 78643K 2 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1200 75K 75K 78643K 1217 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 3 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 9 0K 1K 78643K 10 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12628 0 0 file desc 8 25K 29K 78643K 65 0 0 proc 44 50K 58K 78643K 260 0 0 subproc 68 69634K 69634K 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 6 0 0 in_multi 33 2K 2K 78643K 36 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 42 185K 185K 78643K 42 0 0 exec 0 0K 1K 78643K 167 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 81 20K 20K 78643K 930 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 ip6_options 0 0K 0K 78643K 4 0 0 NDP 5 0K 0K 78643K 9 0 0 temp 81 2364K 2430K 78643K 2994 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 50 0 43 1 0 1 1 0 8 0 plimitpl 152 19 0 10 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 tcpqe 32 18 0 18 1 0 1 1 0 8 1 tcpcb 544 20 0 16 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 186 0 0 12 0 12 12 0 8 0 art_table 32 187 0 0 2 0 2 2 0 8 0 art_node 16 40 0 6 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 8 0 1 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 1495 0 84 46 0 46 46 0 8 0 ffsino 272 1495 0 84 95 0 95 95 0 8 0 nchpl 144 1782 0 159 61 0 61 61 0 8 0 uvmvnodes 72 1538 0 0 28 0 28 28 0 8 0 vnodes 200 1538 0 0 81 0 81 81 0 8 0 namei 1024 4335 0 4334 2 1 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 4357 0 4357 7 2 5 6 0 8 5 sigapl 432 235 0 219 2 0 2 2 0 8 0 futexpl 56 579 0 579 1 0 1 1 0 8 1 knotepl 112 61 0 42 1 0 1 1 0 8 0 kqueuepl 104 30 0 28 1 0 1 1 0 8 0 pipepl 112 146 0 127 2 1 1 1 0 8 0 fdescpl 488 236 0 219 3 0 3 3 0 8 0 filepl 152 1225 0 1129 5 0 5 5 0 8 1 lockfpl 104 8 0 8 2 1 1 1 0 8 1 lockfspl 32 27 0 27 2 1 1 1 0 8 1 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 96 151 0 142 1 0 1 1 0 8 0 zombiepl 144 219 0 219 2 1 1 1 0 8 1 processpl 840 251 0 219 4 0 4 4 0 8 0 procpl 600 357 0 315 4 0 4 4 0 8 0 sockpl 384 128 0 111 3 0 3 3 0 8 1 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 115 0 0 14 0 14 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 137 0 0 9 0 9 9 0 8 0 bufpl 256 5597 0 1122 280 0 280 280 0 8 0 anonpl 16 28102 0 21761 27 1 26 26 0 125 0 amapchunkpl 152 992 0 899 5 0 5 5 0 158 0 amappl16 192 516 0 203 16 0 16 16 0 8 0 amappl15 184 48 0 44 1 0 1 1 0 8 0 amappl14 176 20 0 18 2 1 1 1 0 8 0 amappl13 168 83 0 73 1 0 1 1 0 8 0 amappl12 160 9 0 8 1 0 1 1 0 8 0 amappl11 152 18 0 7 1 0 1 1 0 8 0 amappl10 144 56 0 54 2 1 1 1 0 8 0 amappl9 136 569 0 564 1 0 1 1 0 8 0 amappl8 128 132 0 116 1 0 1 1 0 8 0 amappl7 120 24 0 22 1 0 1 1 0 8 0 amappl6 112 54 0 46 1 0 1 1 0 8 0 amappl5 104 97 0 87 1 0 1 1 0 8 0 amappl4 96 421 0 394 2 1 1 2 0 8 0 amappl3 88 114 0 109 1 0 1 1 0 8 0 amappl2 80 1069 0 1013 2 0 2 2 0 8 0 amappl1 72 13705 0 13266 24 8 16 19 0 8 6 amappl 72 568 0 529 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 24 236 0 219 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 236 0 219 1 0 1 1 0 8 0 vmmpekpl 168 5887 0 5864 2 0 2 2 0 8 0 vmmpepl 168 31804 0 30399 81 11 70 72 0 357 8 vmsppl 360 235 0 219 2 0 2 2 0 8 0 pdppl 4096 480 0 438 6 0 6 6 0 8 0 pvpl 32 113911 0 104388 107 7 100 102 0 265 21 pmappl 224 235 0 219 2 0 2 2 0 8 1 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 428 0 3 13 0 13 13 0 8 0