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


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.194' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   38.941343] audit: type=1400 audit(1600618822.149:8): avc:  denied  { execmem } for  pid=6481 comm="syz-executor075" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
[   38.947634] ================================================================================
[   38.969916] UBSAN: Undefined behaviour in fs/ext4/super.c:3763:25
[   38.976145] shift exponent 32770 is too large for 32-bit type 'int'
[   38.982536] CPU: 0 PID: 6481 Comm: syz-executor075 Not tainted 4.19.146-syzkaller #0
[   38.990407] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   38.999875] Call Trace:
[   39.002449]  dump_stack+0x22c/0x33e
[   39.006063]  ubsan_epilogue+0xe/0x3a
[   39.009760]  __ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250
[   39.015910]  ext4_fill_super.cold+0x33b/0x4ea
[   39.020407]  ? vsnprintf+0x2cc/0x14f0
[   39.024190]  ? pointer+0x850/0x850
[   39.027735]  ? lock_downgrade+0x750/0x750
[   39.031864]  ? ext4_calculate_overhead+0x12f0/0x12f0
[   39.036948]  ? snprintf+0xbb/0xf0
[   39.040390]  ? __mutex_add_waiter+0x160/0x160
[   39.044874]  ? set_blocksize+0x163/0x3f0
[   39.048919]  mount_bdev+0x2fc/0x3b0
[   39.052525]  ? ext4_calculate_overhead+0x12f0/0x12f0
[   39.057608]  mount_fs+0xa3/0x318
[   39.060956]  vfs_kern_mount.part.0+0x68/0x470
[   39.065430]  do_mount+0x51c/0x2f10
[   39.068982]  ? check_preemption_disabled+0x41/0x2b0
[   39.073976]  ? copy_mount_string+0x40/0x40
[   39.078197]  ? kmem_cache_alloc_trace+0x379/0x4b0
[   39.083017]  ? _copy_from_user+0xd2/0x130
[   39.087146]  ? copy_mount_options+0x261/0x370
[   39.091708]  ksys_mount+0xcf/0x130
[   39.095228]  __x64_sys_mount+0xba/0x150
[   39.099185]  ? lockdep_hardirqs_on+0x3c1/0x5e0
[   39.103748]  do_syscall_64+0xf9/0x670
[   39.107532]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   39.112701] RIP: 0033:0x446d1a
[   39.115872] 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
[   39.134749] RSP: 002b:00007fff2eafcf58 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5