[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Load/Save RF Kill Switch Status.
[  OK  ] Started Update UTMP about System Runlevel Changes.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.215' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   44.020659] audit: type=1400 audit(1601632956.817:8): avc:  denied  { execmem } for  pid=6496 comm="syz-executor397" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
[   44.041507] ================================================================================
[   44.050286] UBSAN: Undefined behaviour in fs/ext4/super.c:3763:25
[   44.056555] shift exponent 32770 is too large for 32-bit type 'int'
[   44.062960] CPU: 0 PID: 6496 Comm: syz-executor397 Not tainted 4.19.149-syzkaller #0
[   44.070888] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   44.080245] Call Trace:
[   44.082852]  dump_stack+0x22c/0x33e
[   44.086492]  ubsan_epilogue+0xe/0x3a
[   44.090195]  __ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250
[   44.096393]  ext4_fill_super.cold+0x33b/0x4ea
[   44.100903]  ? vsnprintf+0x2cc/0x14f0
[   44.104704]  ? pointer+0x850/0x850
[   44.108236]  ? lock_downgrade+0x750/0x750
[   44.112378]  ? ext4_calculate_overhead+0x12f0/0x12f0
[   44.117483]  ? snprintf+0xbb/0xf0
[   44.120936]  ? __mutex_add_waiter+0x160/0x160
[   44.125438]  ? set_blocksize+0x163/0x3f0
[   44.129498]  mount_bdev+0x2fc/0x3b0
[   44.133136]  ? ext4_calculate_overhead+0x12f0/0x12f0
[   44.138248]  mount_fs+0xa3/0x318
[   44.141614]  vfs_kern_mount.part.0+0x68/0x470
[   44.146204]  do_mount+0x51c/0x2f10
[   44.150101]  ? check_preemption_disabled+0x41/0x2b0
[   44.155121]  ? copy_mount_string+0x40/0x40
[   44.159355]  ? kmem_cache_alloc_trace+0x379/0x4b0
[   44.164181]  ? _copy_from_user+0xd2/0x130
[   44.168313]  ? copy_mount_options+0x261/0x370
[   44.172789]  ksys_mount+0xcf/0x130
[   44.176316]  __x64_sys_mount+0xba/0x150
[   44.180312]  ? lockdep_hardirqs_on+0x3c1/0x5e0
[   44.185071]  do_syscall_64+0xf9/0x670
[   44.188970]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   44.194146] RIP: 0033:0x446d1a
[   44.197322] Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00
[   44.216229] RSP: 002b:00007ffe166dad48 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
[   44.224007] RAX: ffffffffffffffda RBX: 00007ffe166dada0 RCX: 0000000000446d1a
[   44.231254] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffe166dad60
[   44.238503] RBP: 00007ffe166dad60 R08: 00007ffe166dada0 R09: 0000000000000000
[   44.245853] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000001
[   44.253109] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003
[   44.260366] ================================================================================
[   44.270022] EXT4-f