login: panic: mtx_lock() of spin mutex (null) @ /syzkaller/managers/main/kernel/sys/kern/uipc_sockbuf.c:434
cpuid = 0
time = 1620405981
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0003779120
vpanic() at vpanic+0x1c7/frame 0xfffffe0003779180
panic() at panic+0x43/frame 0xfffffe00037791e0
__mtx_lock_flags() at __mtx_lock_flags+0x202/frame 0xfffffe0003779240
socantrcvmore() at socantrcvmore+0x2c/frame 0xfffffe0003779260
sctp_notify_assoc_change() at sctp_notify_assoc_change+0x5b8/frame 0xfffffe00037792d0
sctp_process_control() at sctp_process_control+0x8d2b/frame 0xfffffe0003779760
sctp_common_input_processing() at sctp_common_input_processing+0x7d0/frame 0xfffffe00037798e0
sctp_input_with_port() at sctp_input_with_port+0x30a/frame 0xfffffe00037799d0
sctp_input() at sctp_input+0x1f/frame 0xfffffe00037799f0
ip_input() at ip_input+0x388/frame 0xfffffe0003779a90
swi_net() at swi_net+0x20d/frame 0xfffffe0003779b10
ithread_loop() at ithread_loop+0x33f/frame 0xfffffe0003779bb0
fork_exit() at fork_exit+0xb3/frame 0xfffffe0003779bf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0003779bf0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 12 tid 100032 ]
Stopped at      kdb_enter+0x67: movq    $0,0x163a54e(%rip)
db> 
db> set $lines = 0
db> set $maxwidth = 0
db>