panic: mtx_lock() of spin mutex (null) @ /syzkaller/managers/main/kernel/sys/kern/uipc_sockbuf.c:252
cpuid = 0
time = 36
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0016ad95b0
vpanic() at vpanic+0x1e0/frame 0xfffffe0016ad9610
panic() at panic+0x43/frame 0xfffffe0016ad9670
__mtx_lock_flags() at __mtx_lock_flags+0x1fd/frame 0xfffffe0016ad96d0
socantrcvmore() at socantrcvmore+0x2c/frame 0xfffffe0016ad96f0
sctp_notify_assoc_change() at sctp_notify_assoc_change+0x5c9/frame 0xfffffe0016ad9770
sctp_abort_an_association() at sctp_abort_an_association+0xff/frame 0xfffffe0016ad97b0
sctp_threshold_management() at sctp_threshold_management+0x30d/frame 0xfffffe0016ad9810
sctp_t1init_timer() at sctp_t1init_timer+0x82/frame 0xfffffe0016ad9850
sctp_timeout_handler() at sctp_timeout_handler+0x8f1/frame 0xfffffe0016ad98e0
softclock_call_cc() at softclock_call_cc+0x1dd/frame 0xfffffe0016ad99b0
softclock() at softclock+0xa3/frame 0xfffffe0016ad99f0
ithread_loop() at ithread_loop+0x2f2/frame 0xfffffe0016ad9a60
fork_exit() at fork_exit+0xb0/frame 0xfffffe0016ad9ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0016ad9ab0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 12 tid 100018 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why