panic: kernel diagnostic assertion "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_sig.c", line 1602
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*344365  77526      0      0x8000  0xc000000    1  syz-executor
  66769  95926      0           0          0    0  syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834bb28a) at panic+0x1e5 sys/kern/subr_prf.c:198
__assert(ffffffff834fb0be,ffffffff834655ae,642,ffffffff834476e1) at __assert+0x29 sys/kern/subr_prf.c:-1
process_stop(ffff8000fffee698,8000000,1) at process_stop+0x3fe
cursig(ffff80002a2207e0,ffff80002a25f5e8,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline]
cursig(ffff80002a2207e0,ffff80002a25f5e8,0) at cursig+0x509 sys/kern/kern_sig.c:1445
userret(ffff80002a2207e0) at userret+0x203 sys/kern/kern_sig.c:2207
syscall(ffff80002a25f720) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80002a25f720) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x8117aa2be0, 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
*cpu1: kernel diagnostic assertion "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_sig.c", line 1602
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834bb28a) at panic+0x1e5 sys/kern/subr_prf.c:198
__assert(ffffffff834fb0be,ffffffff834655ae,642,ffffffff834476e1) at __assert+0x29 sys/kern/subr_prf.c:-1
process_stop(ffff8000fffee698,8000000,1) at process_stop+0x3fe
cursig(ffff80002a2207e0,ffff80002a25f5e8,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline]
cursig(ffff80002a2207e0,ffff80002a25f5e8,0) at cursig+0x509 sys/kern/kern_sig.c:1445
userret(ffff80002a2207e0) at userret+0x203 sys/kern/kern_sig.c:2207
syscall(ffff80002a25f720) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80002a25f720) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x8117aa2be0, count: -8
ddb{1}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff80002a25f400
rbx               0xffff80002999ee07
rdx                                0
rcx               0xffff80002a2207e0
rax               0xffff80002999dff0
r8                 0x101010101010101
r9                0x8080808080808080
r10               0x761323eb1accbfa4
r11               0x81a6217e0aabf2f8
r12               0xffff80002999ec08
r13                                0
r14                                0
r15                              0x1
rip               0xffffffff81792d45    db_enter+0x25
cs                               0x8
rflags                         0x246
rsp               0xffff80002a25f3f0
ss                              0x10
db_enter+0x25:  addq    $0x8,%rsp
ddb{1}>