panic: Assertion in_epoch(net_epoch_preempt) failed at /syzkaller/managers/i386/kernel/sys/netinet/in_mcast.c:1319
cpuid = 0
time = 1570625611
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0022ba04b0
vpanic() at vpanic+0x1e0/frame 0xfffffe0022ba0510
panic() at panic+0x43/frame 0xfffffe0022ba0570
in_leavegroup_locked() at in_leavegroup_locked+0x215/frame 0xfffffe0022ba05d0
inp_setmoptions() at inp_setmoptions+0x1290/frame 0xfffffe0022ba07a0
ip_ctloutput() at ip_ctloutput+0x823/frame 0xfffffe0022ba0800
rip_ctloutput() at rip_ctloutput+0x2c9/frame 0xfffffe0022ba0840
sosetopt() at sosetopt+0x101/frame 0xfffffe0022ba08c0
kern_setsockopt() at kern_setsockopt+0x14f/frame 0xfffffe0022ba0940
sys_setsockopt() at sys_setsockopt+0x33/frame 0xfffffe0022ba0970
ia32_syscall() at ia32_syscall+0x46a/frame 0xfffffe0022ba0ab0
int0x80_syscall_common() at int0x80_syscall_common+0x9c/frame 0x81431b4
KDB: enter: panic
[ thread pid 5109 tid 100815 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why