[ 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