================================================================================
UBSAN: Undefined behaviour in ./include/net/sch_generic.h:1051:7
shift exponent 129 is too large for 32-bit type 'int'
CPU: 1 PID: 18 Comm: ksoftirqd/1 Not tainted 4.19.149-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x22c/0x33e lib/dump_stack.c:118
 ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
 __ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
 qdisc_l2t include/net/sch_generic.h:1051 [inline]
 cbq_update net/sched/sch_cbq.c:567 [inline]
 cbq_dequeue.cold+0x189/0x18e net/sched/sch_cbq.c:814
 dequeue_skb net/sched/sch_generic.c:282 [inline]
 qdisc_restart net/sched/sch_generic.c:385 [inline]
 __qdisc_run+0x1b9/0x1680 net/sched/sch_generic.c:403
 qdisc_run include/net/pkt_sched.h:120 [inline]
 net_tx_action+0x520/0xce0 net/core/dev.c:4592
 __do_softirq+0x27d/0xad2 kernel/softirq.c:292
 run_ksoftirqd+0x57/0x130 kernel/softirq.c:653
 smpboot_thread_fn+0x66e/0xa30 kernel/smpboot.c:164
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
================================================================================

**********************************************************
**   NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE   **
**                                                      **
** trace_printk() being used. Allocating extra memory.  **
**                                                      **
** This means that this is a DEBUG kernel and it is     **
** unsafe for production use.                           **
**                                                      **
** If you see this message and you are not debugging    **
** the kernel, report this immediately to your vendor!  **
**                                                      **
FAT-fs (loop5): bogus number of FAT sectors
**   NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE   **
**********************************************************
FAT-fs (loop5): Can't find a valid FAT filesystem
audit: type=1804 audit(1601859485.390:32): pid=27818 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir048522835/syzkaller.Jf64BN/1198/file1/bus" dev="sda1" ino=16853 res=1
FAT-fs (loop5): bogus number of FAT sectors
FAT-fs (loop5): Can't find a valid FAT filesystem
audit: type=1804 audit(1601859485.570:33): pid=27818 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir048522835/syzkaller.Jf64BN/1198/file1/file1/bus" dev="sda1" ino=16861 res=1
Dev loop4: unable to read RDB block 8
 loop4: unable to read partition table
loop4: partition table beyond EOD, truncated
loop_reread_partitions: partition scan of loop4 () failed (rc=-5)