[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ 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 '10.128.0.67' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 40.747120] audit: type=1400 audit(1602571500.360:8): avc: denied { execmem } for pid=6502 comm="syz-executor308" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 40.757288] F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0) [ 40.774263] F2FS-fs (loop0): Can't find valid F2FS filesystem in 2th superblock [ 40.782787] F2FS-fs (loop0): invalid crc value [ 40.840582] F2FS-fs (loop0): access invalid blkaddr:1 [ 40.845833] ------------[ cut here ]------------ [ 40.850798] WARNING: CPU: 0 PID: 6502 at fs/f2fs/checkpoint.c:166 f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 40.859973] Kernel panic - not syncing: panic_on_warn set ... [ 40.859973] [ 40.867317] CPU: 0 PID: 6502 Comm: syz-executor308 Not tainted 4.19.150-syzkaller #0 [ 40.875174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.884508] Call Trace: [ 40.887081] dump_stack+0x22c/0x33e [ 40.890692] panic+0x2ac/0x565 [ 40.893878] ? __warn_printk+0xf3/0xf3 [ 40.897750] ? f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 40.902536] ? __probe_kernel_read+0x130/0x1b0 [ 40.907097] ? __warn.cold+0x5/0x5a [ 40.910702] ? __warn+0xe4/0x200 [ 40.914051] ? f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 40.918787] __warn.cold+0x20/0x5a [ 40.922308] ? f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 40.927058] report_bug+0x262/0x2b0 [ 40.930680] do_error_trap+0x1e1/0x330 [ 40.934561] ? math_error+0x320/0x320 [ 40.938344] ? irq_work_claim+0xa6/0xc0 [ 40.942298] ? irq_work_queue+0x29/0x80 [ 40.946277] ? error_entry+0x72/0xd0 [ 40.949981] ? trace_hardirqs_off_caller+0x6e/0x210 [ 40.954996] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.959830] invalid_op+0x14/0x20 [ 40.963275] RIP: 0010:f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 40.968632] Code: 90 04 00 00 48 8b 7d 00 44 89 e1 48 c7 c2 80 d1 47 88 48 c7 c6 a0 ce 47 88 e8 0f d8 fd ff 48 c7 c7 c0 d1 47 88 e8 72 d0 23 fe <0f> 0b 45 31 e4 e9 e3 fb ff ff e8 b4 54 3a fe 48 8d bd 5c 0d 00 00 [ 40.987532] RSP: 0018:ffff8880857b7720 EFLAGS: 00010286 [ 40.992874] RAX: 0000000000000024 RBX: 0000000000000005 RCX: 0000000000000000 [ 41.000123] RDX: 0000000000000000 RSI: ffffffff815b623f RDI: ffffed1010af6ed6 [ 41.007373] RBP: ffff88808bdc8b40 R08: 0000000000000024 R09: 0000000000000000 [ 41.014623] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001 [ 41.021882] R13: 0000000000001400 R14: 0000000000004000 R15: ffff88808bdc8c80 [ 41.029147] ? vprintk_func+0x7f/0x224 [ 41.033023] f2fs_submit_page_bio+0x19a/0x15e0 [ 41.037608] ? page_cache_tree_insert+0x410/0x410 [ 41.042446] ? check_preemption_disabled+0x41/0x2b0 [ 41.047445] read_node_page+0x496/0x660 [ 41.051401] ? truncate_node+0x1160/0x1160 [ 41.055630] ? add_to_page_cache_lru+0x259/0x6c0 [ 41.060366] ? add_to_page_cache_locked+0x40/0x40 [ 41.065194] ? pagecache_get_page+0x1c4/0xd90 [ 41.069688] __get_node_page.part.0+0x9b/0x1540 [ 41.074351] f2fs_get_node_page+0x109/0x1a0 [ 41.078665] f2fs_iget+0x22a/0x4e90 [ 41.082276] ? __mutex_add_waiter+0x160/0x160 [ 41.086766] ? kmem_cache_alloc_trace+0x379/0x4b0 [ 41.091610] f2fs_fill_super+0x243d/0x7920 [ 41.095856] ? snprintf+0xbb/0xf0 [ 41.099291] ? f2fs_commit_super+0x400/0x400 [ 41.103681] ? __mutex_add_waiter+0x160/0x160 [ 41.108158] ? set_blocksize+0x163/0x3f0 [ 41.112211] mount_bdev+0x2fc/0x3b0 [ 41.115820] ? f2fs_commit_super+0x400/0x400 [ 41.120208] mount_fs+0xa3/0x318 [ 41.123575] vfs_kern_mount.part.0+0x68/0x470 [ 41.128149] do_mount+0x51c/0x2f10 [ 41.131673] ? __do_page_fault+0x1ca/0xe00 [ 41.135902] ? copy_mount_string+0x40/0x40 [ 41.140115] ? copy_mount_options+0x1c3/0x370 [ 41.144624] ? copy_mount_options+0x1d0/0x370 [ 41.149098] ? memset+0x20/0x40 [ 41.152355] ? copy_mount_options+0x261/0x370 [ 41.156839] ksys_mount+0xcf/0x130 [ 41.160361] __x64_sys_mount+0xba/0x150 [ 41.164324] ? lockdep_hardirqs_on+0x3c1/0x5e0 [ 41.168888] do_syscall_64+0xf9/0x670 [ 41.172670] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.177838] RIP: 0033:0x44771a [ 41.181022] 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 [ 41.199997] RSP: 002b:00007ffe0423a798 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 [ 41.207861] RAX: ffffffffffffffda RBX: 00007ffe0423a7f0 RCX: 000000000044771a [ 41.215112] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffe0423a7b0 [ 41.222364] RBP: 00007ffe0423a7b0 R08: 00007ffe0423a7f0 R09: 00007ffe00000015 [ 41.229629] R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000034 [ 41.236908] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 41.245412] Kernel Offset: disabled [ 41.249087] Rebooting in 86400 seconds..