[ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.130' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 35.288454] audit: type=1400 audit(1600856169.820:8): avc: denied { execmem } for pid=6354 comm="syz-executor404" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 35.297181] F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0) [ 35.317302] F2FS-fs (loop0): Can't find valid F2FS filesystem in 2th superblock [ 35.327273] F2FS-fs (loop0): invalid crc value [ 35.368902] ------------[ cut here ]------------ [ 35.373843] kernel BUG at fs/f2fs/node.c:1031! [ 35.379466] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 35.384821] Modules linked in: [ 35.388007] CPU: 1 PID: 6354 Comm: syz-executor404 Not tainted 4.14.198-syzkaller #0 [ 35.395872] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.405225] task: ffff888085db6480 task.stack: ffff888097f08000 [ 35.411273] RIP: 0010:remove_inode_page+0x578/0x610 [ 35.416290] RSP: 0018:ffff888097f0f918 EFLAGS: 00010297 [ 35.421629] RAX: ffff888085db6480 RBX: 1ffff11012fe1f23 RCX: 0000000000000000 [ 35.428891] RDX: 0000000000000000 RSI: ffffea0002a31080 RDI: ffff888082a9c8c0 [ 35.436156] RBP: ffff888082a9c7f0 R08: 0000000000000000 R09: 0000000000000003 [ 35.443422] R10: 0000000000000000 R11: ffff888085db6480 R12: 0000000000000000 [ 35.450693] R13: ffff888097f0f948 R14: 0000000000006000 R15: dffffc0000000000 [ 35.458157] FS: 0000000002492880(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 [ 35.466383] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.472258] CR2: 00007f7e7872e000 CR3: 00000000a57b9000 CR4: 00000000001406e0 [ 35.480555] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.488120] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.495563] Call Trace: [ 35.498157] ? get_dnode_of_data+0x1ca0/0x1ca0 [ 35.502716] ? lock_acquire+0x170/0x3f0 [ 35.506667] f2fs_evict_inode+0xc2e/0x1070 [ 35.510890] ? f2fs_write_inode+0x1d0/0x1d0 [ 35.515217] evict+0x2c8/0x700 [ 35.518406] iput+0x458/0x7e0 [ 35.521506] ? f2fs_show_options+0xdf0/0xdf0 [ 35.525982] f2fs_fill_super+0x4084/0x56a0 [ 35.530221] ? snprintf+0xa5/0xd0 [ 35.533667] ? f2fs_commit_super+0x3a0/0x3a0 [ 35.538079] ? ns_test_super+0x50/0x50 [ 35.541953] ? set_blocksize+0x125/0x380 [ 35.546016] mount_bdev+0x2b3/0x360 [ 35.549645] ? f2fs_commit_super+0x3a0/0x3a0 [ 35.554049] mount_fs+0x92/0x2a0 [ 35.557429] vfs_kern_mount.part.0+0x5b/0x470 [ 35.561913] do_mount+0xe53/0x2a00 [ 35.565448] ? do_raw_spin_unlock+0x164/0x220 [ 35.569925] ? copy_mount_string+0x40/0x40 [ 35.574155] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 35.579180] ? copy_mnt_ns+0xa30/0xa30 [ 35.583063] ? copy_mount_options+0x1fa/0x2f0 [ 35.587537] ? copy_mnt_ns+0xa30/0xa30 [ 35.591403] SyS_mount+0xa8/0x120 [ 35.594845] ? copy_mnt_ns+0xa30/0xa30 [ 35.598727] do_syscall_64+0x1d5/0x640 [ 35.602776] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 35.607961] RIP: 0033:0x4471fa [ 35.611127] RSP: 002b:00007ffdf44a2a38 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 [ 35.618834] RAX: ffffffffffffffda RBX: 00007ffdf44a2a90 RCX: 00000000004471fa [ 35.626100] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffdf44a2a50 [ 35.633349] RBP: 00007ffdf44a2a50 R08: 00007ffdf44a2a90 R09: 00007ffd00000015 [ 35.640609] R10: 0000000000000000 R11: 0000000000000297 R12: 000000000000000f [ 35.647882] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 35.655160] Code: 0f 0b e8 dc bc a4 fe 49 8d 6d ff e9 0f fd ff ff e8 ce bc a4 fe 48 c7 c6 60 f6 db 86 48 89 ef e8 5f 0b c3 fe 0f 0b e8 b8 bc a4 fe <0f> 0b e8 f1 8f ce fe e9 f2 fa ff ff e8 e7 8f ce fe e9 d0 fc ff [ 35.674418] RIP: remove_inode_page+0x578/0x610 RSP: ffff888097f0f918 [ 35.682000] ---[ end trace 94b6df8d860872dc ]--- [ 35.686770] Kernel panic - not syncing: Fatal exception [ 35.693199] Kernel Offset: disabled [ 35.696907] Rebooting in 86400 seconds..