panic: kernel diagnostic assertion "__mp_lock_held(&sched_lock, curcpu()) == 0" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_lock.c", line 63 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *226148 13902 0 0x1802 0x4080080 1 syz-executor2883823057 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8259bd82) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff8261504d,ffffffff8261b5a3,3f,ffffffff8264d4fb) at __assert+0x25 sys/kern/subr_prf.c:161 _kernel_lock() at _kernel_lock+0xb2 sys/kern/kern_lock.c:63 single_thread_check_locked(ffff800021232548,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff800021232548,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff8000212c2550,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff8000212c2550,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff800021232548,ffffffff82957750,120,ffffffff82595e88,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(bc96a93640,1,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff800021232548,ffff8000212c26e0,ffff8000212c2740) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff8000212c27b0) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212c27b0) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbcc5099500, count: 3 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 *cpu1: kernel diagnostic assertion "__mp_lock_held(&sched_lock, curcpu()) == 0" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_lock.c", line 63 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8259bd82) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff8261504d,ffffffff8261b5a3,3f,ffffffff8264d4fb) at __assert+0x25 sys/kern/subr_prf.c:161 _kernel_lock() at _kernel_lock+0xb2 sys/kern/kern_lock.c:63 single_thread_check_locked(ffff800021232548,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff800021232548,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff8000212c2550,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff8000212c2550,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff800021232548,ffffffff82957750,120,ffffffff82595e88,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(bc96a93640,1,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff800021232548,ffff8000212c26e0,ffff8000212c2740) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff8000212c27b0) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212c27b0) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbcc5099500, count: -12 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff8000212c2310 rbx 0xffff800020dd9bb7 rdx 0x3fd rcx 0 rax 0x9f r8 0x101010101010101 r9 0x8080808080808080 r10 0x3b3e1894665f128c r11 0x7302afdd430d6aad r12 0xffff800020dd99b8 r13 0 r14 0 r15 0x1 rip 0xffffffff81477f68 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000212c2300 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor2883823057) pid=226148 stat=onproc flags process=1802 proc=4080080 pri=52, usrpri=52, nice=20 forw=0xffffffffffffffff, list=0xffff800021233a48,0xffffffff82ae5bb0 process=0xffff8000ffff10b0 user=0xffff8000212bd000, vmspace=0xfffffd807effd450 estcpu=2, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 13902 344694 23130 0 2 0x3802 syz-executor2883823057 *13902 226148 23130 0 7 0x4081882 syz-executor2883823057 23130 385634 76440 0 3 0x10008a sigsusp ksh 76440 29313 65506 0 3 0x9a kqread sshd 95913 287839 1 0 3 0x100083 ttyin getty 65506 148128 1 0 3 0x88 kqread sshd 62671 98026 96552 73 3 0x1100090 kqread syslogd 96552 311686 1 0 3 0x100082 netio syslogd 50429 379011 1 0 3 0x100080 kqread resolvd 89371 503269 64993 77 3 0x100092 kqread dhcpleased 97655 176247 64993 77 3 0x100092 kqread dhcpleased 64993 120395 1 0 3 0x80 kqread dhcpleased 3118 392503 0 0 3 0x14200 bored smr 605 361361 0 0 3 0x14200 pgzero zerothread 85162 142689 0 0 3 0x14200 aiodoned aiodoned 45741 485789 0 0 3 0x14200 syncer update 35012 262224 0 0 3 0x14200 cleaner cleaner 75116 185128 0 0 3 0x14200 reaper reaper 79943 462738 0 0 3 0x14200 pgdaemon pagedaemon 62164 479814 0 0 3 0x14200 bored viomb 15524 293409 0 0 3 0x40014200 acpi0 acpi0 89569 79084 0 0 3 0x40014200 idle1 23750 277942 0 0 3 0x14200 bored softnet 93256 6832 0 0 3 0x14200 bored softnet 90721 370093 0 0 3 0x14200 bored softnet 86336 16639 0 0 3 0x14200 bored softnet 16269 147355 0 0 3 0x14200 bored systqmp 93611 6797 0 0 3 0x14200 bored systq 4323 195309 0 0 3 0x40014200 bored softclock 91359 359082 0 0 7 0x40014200 idle0 1 151075 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive sched_lock &sched_lock r = 0 (0xffffffff82b5eeb8) #0 witness_lock+0x44d #1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 #2 mi_switch+0x3d4 sys/kern/sched_bsd.c:419 #3 single_thread_check_locked+0x17f sys/kern/kern_sig.c:2045 #4 single_thread_check+0x4b sys/kern/kern_sig.c:2057 #5 sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] #5 sleep_finish+0x75 sys/kern/kern_synch.c:400 #6 rwsleep+0xd5 sys/kern/kern_synch.c:314 #7 futex_wait+0x13c sys/kern/sys_futex.c:260 #8 sys_futex+0xf8 sys/kern/sys_futex.c:111 #9 syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] #9 syscall+0x484 sys/arch/amd64/amd64/trap.c:585 #10 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10146 6388K 6420K 78643K 11236 0 pcb 13 8K 8K 78643K 13 0 rtable 58 1K 2K 78643K 104 0 ifaddr 24 7K 7K 78643K 24 0 counters 40 33K 33K 78643K 40 0 ioctlops 0 0K 2K 78643K 25 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1166 73K 73K 78643K 1179 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 1 0K 0K 78643K 1 0 proc 55 78K 79K 78643K 226 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 25 122K 122K 78643K 25 0 exec 0 0K 2K 78643K 389 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 59 11K 11K 78643K 1401 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 3 0K 0K 78643K 3 0 temp 18 4705K 4769K 78643K 2266 0 kqueue 11 16K 18K 78643K 24 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 17 0 14 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 136 33 0 20 1 0 1 1 0 8 0 syncache 296 5 0 5 2 1 1 1 0 8 1 tcpcb 736 8 0 5 1 0 1 1 0 8 0 arp 120 2 0 0 1 0 1 1 0 8 0 inpcb 320 25 0 19 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 97 0 0 7 0 7 7 0 8 0 art_table 32 98 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1416 0 38 87 0 87 87 0 8 0 ffsino 272 1416 0 38 92 0 92 92 0 8 0 nchpl 144 1603 0 47 58 0 58 58 0 8 0 uvmvnodes 80 1425 0 0 30 0 30 30 0 8 0 vnodes 224 1425 0 0 84 0 84 84 0 8 0 namei 1024 4171 0 4171 2 1 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 kstatmem 264 6 0 0 1 0 1 1 0 8 0 scxspl 216 4008 0 4008 10 8 2 8 0 8 2 plimitpl 152 17 0 10 1 0 1 1 0 8 0 sigapl 424 294 0 264 4 0 4 4 0 8 0 futexpl 64 1 0 0 1 0 1 1 0 8 0 knotepl 120 50 0 0 2 0 2 2 0 8 0 kqueuepl 224 20 0 13 1 0 1 1 0 8 0 pipepl 336 79 0 76 2 1 1 1 0 8 0 fdescpl 496 277 0 264 3 1 2 3 0 8 0 filepl 152 1043 0 990 3 0 3 3 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 104 64 0 54 1 0 1 1 0 8 0 zombiepl 144 264 0 264 2 1 1 1 0 8 1 processpl 1064 294 0 264 3 0 3 3 0 8 0 procpl 672 295 0 264 3 0 3 3 0 8 0 sockpl 480 75 0 53 3 0 3 3 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 76 0 0 9 0 9 9 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 119 0 0 7 0 7 7 0 8 0 bufpl 288 1945 0 86 133 0 133 133 0 8 0 anonpl 24 35567 0 33567 15 2 13 13 0 186 0 amapchunkpl 152 2550 0 2449 5 1 4 5 0 158 0 amappl16 200 85 0 80 1 0 1 1 0 8 0 amappl15 192 1 0 1 1 1 0 1 0 8 0 amappl13 176 32 0 31 2 1 1 1 0 8 0 amappl12 168 3 0 3 2 1 1 1 0 8 1 amappl11 160 60 0 47 1 0 1 1 0 8 0 amappl10 152 1 0 1 1 1 0 1 0 8 0 amappl9 144 493 0 490 1 0 1 1 0 8 0 amappl8 136 333 0 331 2 1 1 1 0 8 0 amappl7 128 48 0 45 1 0 1 1 0 8 0 amappl6 120 94 0 84 1 0 1 1 0 8 0 amappl5 112 81 0 73 1 0 1 1 0 8 0 amappl4 104 565 0 546 1 0 1 1 0 8 0 amappl3 96 400 0 378 1 0 1 1 0 8 0 amappl2 88 416 0 378 1 0 1 1 0 8 0 amappl1 80 8759 0 8368 9 0 9 9 0 8 0 amappl 88 1147 0 1107 2 1 1 2 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 277 0 264 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 277 0 264 1 0 1 1 0 8 0 vmmpekpl 168 6036 0 6023 1 0 1 1 0 8 0 vmmpepl 168 24953 0 24124 40 2 38 38 0 357 0 vmsppl 368 276 0 264 2 0 2 2 0 8 0 rwobjpl 56 9116 0 7145 29 0 29 29 0 8 0 pdppl 4096 561 0 528 51 18 33 41 0 8 0 pvpl 32 118885 0 115008 34 1 33 33 0 265 0 pmappl 248 276 0 264 2 1 1 2 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 402 0 22 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff8292aff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff82b5ecb0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82b5ecb0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff82b5ecb0,1) at __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x3d4 sys/kern/sched_bsd.c:419 sched_idle(ffffffff8292aff0) at sched_idle+0x1a6 sys/kern/kern_sched.c:164 end trace frame: 0x0, count: 8 ddb{0}> trace x86_ipi_db(ffffffff8292aff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff82b5ecb0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82b5ecb0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff82b5ecb0,1) at __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x3d4 sys/kern/sched_bsd.c:419 sched_idle(ffffffff8292aff0) at sched_idle+0x1a6 sys/kern/kern_sched.c:164 end trace frame: 0x0, count: -7 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8259bd82) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff8261504d,ffffffff8261b5a3,3f,ffffffff8264d4fb) at __assert+0x25 sys/kern/subr_prf.c:161 _kernel_lock() at _kernel_lock+0xb2 sys/kern/kern_lock.c:63 single_thread_check_locked(ffff800021232548,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff800021232548,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff8000212c2550,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff8000212c2550,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff800021232548,ffffffff82957750,120,ffffffff82595e88,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(bc96a93640,1,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff800021232548,ffff8000212c26e0,ffff8000212c2740) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff8000212c27b0) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212c27b0) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbcc5099500, count: 3 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8259bd82) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff8261504d,ffffffff8261b5a3,3f,ffffffff8264d4fb) at __assert+0x25 sys/kern/subr_prf.c:161 _kernel_lock() at _kernel_lock+0xb2 sys/kern/kern_lock.c:63 single_thread_check_locked(ffff800021232548,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff800021232548,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff8000212c2550,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff8000212c2550,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff800021232548,ffffffff82957750,120,ffffffff82595e88,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(bc96a93640,1,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff800021232548,ffff8000212c26e0,ffff8000212c2740) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff8000212c27b0) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212c27b0) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbcc5099500, count: -12 ddb{1}>