[ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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 Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.60' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 41.214159] audit: type=1400 audit(1600711810.144:8): avc: denied { execmem } for pid=6494 comm="syz-executor159" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 41.226972] F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0) [ 41.242279] F2FS-fs (loop0): Can't find valid F2FS filesystem in 2th superblock [ 41.251084] F2FS-fs (loop0): invalid crc value [ 41.298950] F2FS-fs (loop0): access invalid blkaddr:1 [ 41.304251] ------------[ cut here ]------------ [ 41.309310] WARNING: CPU: 1 PID: 6494 at fs/f2fs/checkpoint.c:166 f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 41.318495] Kernel panic - not syncing: panic_on_warn set ... [ 41.318495] [ 41.326284] CPU: 1 PID: 6494 Comm: syz-executor159 Not tainted 4.19.146-syzkaller #0 [ 41.334147] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.343487] Call Trace: [ 41.346066] dump_stack+0x22c/0x33e [ 41.349717] panic+0x2ac/0x565 [ 41.352899] ? __warn_printk+0xf3/0xf3 [ 41.356784] ? f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 41.361534] ? __probe_kernel_read+0x130/0x1b0 [ 41.366134] ? __warn.cold+0x5/0x5a [ 41.369744] ? __warn+0xe4/0x200 [ 41.373104] ? f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 41.377861] __warn.cold+0x20/0x5a [ 41.381386] ? f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 41.386146] report_bug+0x262/0x2b0 [ 41.389779] do_error_trap+0x1e1/0x330 [ 41.393674] ? math_error+0x320/0x320 [ 41.397629] ? irq_work_claim+0xa6/0xc0 [ 41.401630] ? irq_work_queue+0x29/0x80 [ 41.405614] ? wake_up_klogd+0xef/0x140 [ 41.409593] ? vprintk_emit+0x1d0/0x7c0 [ 41.413570] ? trace_hardirqs_off_caller+0x69/0x210 [ 41.418608] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.423458] invalid_op+0x14/0x20 [ 41.426998] RIP: 0010:f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 41.432363] 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 [ 41.452056] RSP: 0018:ffff888089687720 EFLAGS: 00010286 [ 41.457403] RAX: 0000000000000024 RBX: 0000000000000005 RCX: 0000000000000000 [ 41.464663] RDX: 0000000000000000 RSI: ffffffff815b523f RDI: ffffed10112d0ed6 [ 41.471936] RBP: ffff88808d194d00 R08: 0000000000000024 R09: 0000000000000000 [ 41.479208] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001 [ 41.486473] R13: 0000000000001400 R14: 0000000000004000 R15: ffff88808d194e40 [ 41.494036] ? vprintk_func+0x7f/0x224 [ 41.497939] f2fs_submit_page_bio+0x19a/0x15e0 [ 41.502516] ? page_cache_tree_insert+0x410/0x410 [ 41.507359] ? check_preemption_disabled+0x41/0x2b0 [ 41.512364] read_node_page+0x496/0x660 [ 41.516322] ? truncate_node+0x1160/0x1160 [ 41.520543] ? add_to_page_cache_lru+0x259/0x6c0 [ 41.525293] ? add_to_page_cache_locked+0x40/0x40 [ 41.530139] ? pagecache_get_page+0x1c4/0xd90 [ 41.534634] __get_node_page.part.0+0x9b/0x1540 [ 41.539300] f2fs_get_node_page+0x109/0x1a0 [ 41.543611] f2fs_iget+0x22a/0x4e90 [ 41.547250] ? __mutex_add_waiter+0x160/0x160 [ 41.551735] ? kmem_cache_alloc_trace+0x379/0x4b0 [ 41.556583] f2fs_fill_super+0x243d/0x7920 [ 41.560855] ? snprintf+0xbb/0xf0 [ 41.564314] ? f2fs_commit_super+0x400/0x400 [ 41.568715] ? __mutex_add_waiter+0x160/0x160 [ 41.573213] ? set_blocksize+0x163/0x3f0 [ 41.577359] mount_bdev+0x2fc/0x3b0 [ 41.580978] ? f2fs_commit_super+0x400/0x400 [ 41.585391] mount_fs+0xa3/0x318 [ 41.588767] vfs_kern_mount.part.0+0x68/0x470 [ 41.593257] do_mount+0x51c/0x2f10 [ 41.596858] ? check_preemption_disabled+0x41/0x2b0 [ 41.601872] ? copy_mount_string+0x40/0x40 [ 41.606287] ? kmem_cache_alloc_trace+0x379/0x4b0 [ 41.611122] ? _copy_from_user+0xd2/0x130 [ 41.615270] ? copy_mount_options+0x261/0x370 [ 41.619752] ksys_mount+0xcf/0x130 [ 41.623296] __x64_sys_mount+0xba/0x150 [ 41.627277] ? lockdep_hardirqs_on+0x3c1/0x5e0 [ 41.631855] do_syscall_64+0xf9/0x670 [ 41.635668] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.640851] RIP: 0033:0x44714a [ 41.644029] 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 [ 41.662921] RSP: 002b:00007ffe54fcaf38 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 [ 41.670630] RAX: ffffffffffffffda RBX: 00007ffe54fcaf90 RCX: 000000000044714a [ 41.678006] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffe54fcaf50 [ 41.685269] RBP: 00007ffe54fcaf50 R08: 00007ffe54fcaf90 R09: 00007ffe00000015 [ 41.692526] R10: 0000000000000000 R11: 0000000000000297 R12: 000000000000000f [ 41.699788] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 41.708173] Kernel Offset: disabled [ 41.711848] Rebooting in 86400 seconds..