[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ 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 '10.128.0.222' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 42.978596] audit: type=1400 audit(1600826399.053:8): avc: denied { execmem } for pid=6481 comm="syz-executor726" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 42.990949] F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0) [ 43.018236] F2FS-fs (loop0): Can't find valid F2FS filesystem in 2th superblock [ 43.030876] F2FS-fs (loop0): invalid crc value [ 43.088037] F2FS-fs (loop0): access invalid blkaddr:1 [ 43.096940] ------------[ cut here ]------------ [ 43.104376] WARNING: CPU: 1 PID: 6481 at fs/f2fs/checkpoint.c:166 f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 43.117981] Kernel panic - not syncing: panic_on_warn set ... [ 43.117981] [ 43.126714] CPU: 1 PID: 6481 Comm: syz-executor726 Not tainted 4.19.146-syzkaller #0 [ 43.136508] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.146490] Call Trace: [ 43.149163] dump_stack+0x22c/0x33e [ 43.153266] panic+0x2ac/0x565 [ 43.156644] ? __warn_printk+0xf3/0xf3 [ 43.160807] ? f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 43.166848] ? __probe_kernel_read+0x130/0x1b0 [ 43.172272] ? __warn.cold+0x5/0x5a [ 43.177587] ? __warn+0xe4/0x200 [ 43.182360] ? f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 43.189254] __warn.cold+0x20/0x5a [ 43.194059] ? f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 43.200261] report_bug+0x262/0x2b0 [ 43.205216] do_error_trap+0x1e1/0x330 [ 43.209153] ? math_error+0x320/0x320 [ 43.213940] ? irq_work_claim+0xa6/0xc0 [ 43.218101] ? irq_work_queue+0x29/0x80 [ 43.222355] ? wake_up_klogd+0xef/0x140 [ 43.227185] ? vprintk_emit+0x1d0/0x7c0 [ 43.231782] ? trace_hardirqs_off_caller+0x69/0x210 [ 43.237849] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.243234] invalid_op+0x14/0x20 [ 43.247271] RIP: 0010:f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 43.252660] Code: 90 04 00 00 48 8b 7d 00 44 89 e1 48 c7 c2 80 ce 47 88 48 c7 c6 a0 cb 47 88 e8 0f d8 fd ff 48 c7 c7 c0 ce 47 88 e8 82 f0 23 fe <0f> 0b 45 31 e4 e9 e3 fb ff ff e8 44 75 3a fe 48 8d bd 5c 0d 00 00 [ 43.280452] RSP: 0018:ffff8880a44bf720 EFLAGS: 00010286 [ 43.287184] RAX: 0000000000000024 RBX: 0000000000000005 RCX: 0000000000000000 [ 43.296812] RDX: 0000000000000000 RSI: ffffffff815b523f RDI: ffffed1014897ed6 [ 43.307503] RBP: ffff8880a4750f80 R08: 0000000000000024 R09: 0000000000000000 [ 43.317421] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001 [ 43.327090] R13: 0000000000001400 R14: 0000000000004000 R15: ffff8880a47510c0 [ 43.334648] ? vprintk_func+0x7f/0x224 [ 43.339219] f2fs_submit_page_bio+0x19a/0x15e0 [ 43.344772] ? page_cache_tree_insert+0x410/0x410 [ 43.350130] ? check_preemption_disabled+0x41/0x2b0 [ 43.355730] read_node_page+0x496/0x660 [ 43.360370] ? truncate_node+0x1160/0x1160 [ 43.366151] ? add_to_page_cache_lru+0x259/0x6c0 [ 43.371387] ? add_to_page_cache_locked+0x40/0x40 [ 43.376986] ? pagecache_get_page+0x1c4/0xd90 [ 43.383274] __get_node_page.part.0+0x9b/0x1540 [ 43.388537] f2fs_get_node_page+0x109/0x1a0 [ 43.394447] f2fs_iget+0x22a/0x4e90 [ 43.399309] ? __mutex_add_waiter+0x160/0x160 [ 43.404924] ? kmem_cache_alloc_trace+0x379/0x4b0 [ 43.410500] f2fs_fill_super+0x243d/0x7920 [ 43.416514] ? snprintf+0xbb/0xf0 [ 43.420904] ? f2fs_commit_super+0x400/0x400 [ 43.427443] ? __mutex_add_waiter+0x160/0x160 [ 43.432756] ? set_blocksize+0x163/0x3f0 [ 43.438906] mount_bdev+0x2fc/0x3b0 [ 43.444356] ? f2fs_commit_super+0x400/0x400 [ 43.451441] mount_fs+0xa3/0x318 [ 43.455316] vfs_kern_mount.part.0+0x68/0x470 [ 43.460970] do_mount+0x51c/0x2f10 [ 43.466369] ? do_raw_spin_unlock+0x171/0x240 [ 43.472249] ? check_preemption_disabled+0x41/0x2b0 [ 43.479731] ? copy_mount_string+0x40/0x40 [ 43.485579] ? kmem_cache_alloc_trace+0x379/0x4b0 [ 43.491030] ? copy_mount_options+0x261/0x370 [ 43.496344] ksys_mount+0xcf/0x130 [ 43.499906] __x64_sys_mount+0xba/0x150 [ 43.504393] ? lockdep_hardirqs_on+0x3c1/0x5e0 [ 43.510198] do_syscall_64+0xf9/0x670 [ 43.515674] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 43.522615] RIP: 0033:0x44771a [ 43.526329] 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 [ 43.547287] RSP: 002b:00007ffd5d1eb958 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 [ 43.556207] RAX: ffffffffffffffda RBX: 00007ffd5d1eb9b0 RCX: 000000000044771a [ 43.565371] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffd5d1eb970 [ 43.573797] RBP: 00007ffd5d1eb970 R08: 00007ffd5d1eb9b0 R09: 00007ffd00000015 [ 43.582544] R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000034 [ 43.592763] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 43.603568] Kernel Offset: disabled [ 43.607685] Rebooting in 86400 seconds..