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


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.250' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   41.424744] audit: type=1400 audit(1600622589.906:8): avc:  denied  { execmem } for  pid=6493 comm="syz-executor855" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
[   41.436107] erofs: read_super, device -> /dev/loop0
[   41.452099] erofs: options -> 
[   41.455494] ================================================================================
[   41.464188] UBSAN: Undefined behaviour in drivers/staging/erofs/super.c:122:3
[   41.471564] shift exponent 55 is too large for 32-bit type 'int'
[   41.477693] CPU: 0 PID: 6493 Comm: syz-executor855 Not tainted 4.19.146-syzkaller #0
[   41.485563] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   41.495688] Call Trace:
[   41.498278]  dump_stack+0x22c/0x33e
[   41.501906]  ubsan_epilogue+0xe/0x3a
[   41.505630]  __ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250
[   41.511766]  ? __bread_gfp+0x81/0x300
[   41.515554]  erofs_fill_super+0x397/0x12fc
[   41.519792]  ? trace_event_raw_event_erofs_fill_inode.cold+0x68/0x68
[   41.526268]  ? vsprintf+0x30/0x30
[   41.529724]  ? __mutex_add_waiter+0x160/0x160
[   41.534203]  ? set_blocksize+0x163/0x3f0
[   41.538273]  mount_bdev+0x2fc/0x3b0
[   41.541884]  ? trace_event_raw_event_erofs_fill_inode.cold+0x68/0x68
[   41.548358]  erofs_mount+0x8c/0xc0
[   41.551880]  ? erofs_kill_sb+0x20/0x20
[   41.555752]  mount_fs+0xa3/0x318
[   41.559117]  vfs_kern_mount.part.0+0x68/0x470
[   41.563607]  do_mount+0x51c/0x2f10
[   41.567133]  ? check_preemption_disabled+0x41/0x2b0
[   41.572178]  ? copy_mount_string+0x40/0x40
[   41.576408]  ? kmem_cache_alloc_trace+0x379/0x4b0
[   41.581261]  ? _copy_from_user+0xd2/0x130
[   41.585398]  ? copy_mount_options+0x261/0x370
[   41.589879]  ksys_mount+0xcf/0x130
[   41.593420]  __x64_sys_mount+0xba/0x150
[   41.597385]  ? lockdep_hardirqs_on+0x3c1/0x5e0
[   41.601948]  do_syscall_64+0xf9/0x670
[   41.605742]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   41.610915] RIP: 0033:0x446d4a
[   41.614087] 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
[   41.632971] RSP: 002b:00007ffe5db93678 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5
[   41.640658] RAX: ffffffffffffffda RBX: 00007ffe5db936d0 RCX: 0000000000446d4a
[   41.647908] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffe5db93690
[   41.655156] RBP: 00007ffe5db93690 R08: 00007ffe5db936d0 R09: 00007ffe00000015
[   41.662421] R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000002
[   41.669668] R13: 0000000000000004 R14: 0000000000000003 R15: 00000000