[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.233' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 43.710973] audit: type=1400 audit(1601821982.407:8): avc: denied { execmem } for pid=6476 comm="syz-executor138" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 43.726269] F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0) [ 43.740535] F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock [ 43.751017] F2FS-fs (loop0): invalid crc value [ 43.801662] F2FS-fs (loop0): access invalid blkaddr:1 [ 43.806929] ------------[ cut here ]------------ [ 43.811903] WARNING: CPU: 0 PID: 6476 at fs/f2fs/checkpoint.c:166 f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 43.821066] Kernel panic - not syncing: panic_on_warn set ... [ 43.821066] [ 43.828410] CPU: 0 PID: 6476 Comm: syz-executor138 Not tainted 4.19.149-syzkaller #0 [ 43.836265] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.845595] Call Trace: [ 43.848169] dump_stack+0x22c/0x33e [ 43.851779] panic+0x2ac/0x565 [ 43.854953] ? __warn_printk+0xf3/0xf3 [ 43.858824] ? f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 43.863606] ? __probe_kernel_read+0x130/0x1b0 [ 43.868166] ? __warn.cold+0x5/0x5a [ 43.871783] ? __warn+0xe4/0x200 [ 43.875132] ? f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 43.879867] __warn.cold+0x20/0x5a [ 43.883388] ? f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 43.888131] report_bug+0x262/0x2b0 [ 43.891764] do_error_trap+0x1e1/0x330 [ 43.895643] ? math_error+0x320/0x320 [ 43.899425] ? irq_work_claim+0xa6/0xc0 [ 43.903380] ? irq_work_queue+0x29/0x80 [ 43.907345] ? error_entry+0x72/0xd0 [ 43.911037] ? trace_hardirqs_off_caller+0x6e/0x210 [ 43.916037] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.920862] invalid_op+0x14/0x20 [ 43.924309] RIP: 0010:f2fs_is_valid_blkaddr+0x5bd/0xa90 [ 43.929652] 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 d2 ce 23 fe <0f> 0b 45 31 e4 e9 e3 fb ff ff e8 14 53 3a fe 48 8d bd 5c 0d 00 00 [ 43.949079] RSP: 0018:ffff8880a4787720 EFLAGS: 00010286 [ 43.954420] RAX: 0000000000000024 RBX: 0000000000000005 RCX: 0000000000000000 [ 43.961667] RDX: 0000000000000000 RSI: ffffffff815b623f RDI: ffffed10148f0ed6 [ 43.968919] RBP: ffff8880a3a34c80 R08: 0000000000000024 R09: 0000000000000000 [ 43.976167] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001 [ 43.983429] R13: 0000000000001400 R14: 0000000000004000 R15: ffff8880a3a34dc0 [ 43.990691] ? vprintk_func+0x7f/0x224 [ 43.994565] f2fs_submit_page_bio+0x19a/0x15e0 [ 43.999127] ? page_cache_tree_insert+0x410/0x410 [ 44.003955] ? check_preemption_disabled+0x41/0x2b0 [ 44.008954] read_node_page+0x496/0x660 [ 44.012909] ? truncate_node+0x1160/0x1160 [ 44.017129] ? add_to_page_cache_lru+0x259/0x6c0 [ 44.021864] ? add_to_page_cache_locked+0x40/0x40 [ 44.026692] ? pagecache_get_page+0x1c4/0xd90 [ 44.032396] __get_node_page.part.0+0x9b/0x1540 [ 44.037057] f2fs_get_node_page+0x109/0x1a0 [ 44.041370] f2fs_iget+0x22a/0x4e90 [ 44.044982] ? __mutex_add_waiter+0x160/0x160 [ 44.049460] ? kmem_cache_alloc_trace+0x379/0x4b0 [ 44.054289] f2fs_fill_super+0x243d/0x7920 [ 44.058517] ? snprintf+0xbb/0xf0 [ 44.061959] ? f2fs_commit_super+0x400/0x400 [ 44.066359] ? __mutex_add_waiter+0x160/0x160 [ 44.070836] ? set_blocksize+0x163/0x3f0 [ 44.074884] mount_bdev+0x2fc/0x3b0 [ 44.078490] ? f2fs_commit_super+0x400/0x400 [ 44.082881] mount_fs+0xa3/0x318 [ 44.086248] vfs_kern_mount.part.0+0x68/0x470 [ 44.090827] do_mount+0x51c/0x2f10 [ 44.094360] ? do_raw_spin_unlock+0x171/0x240 [ 44.098907] ? check_preemption_disabled+0x41/0x2b0 [ 44.103909] ? copy_mount_string+0x40/0x40 [ 44.108135] ? kmem_cache_alloc_trace+0x379/0x4b0 [ 44.112960] ? copy_mount_options+0x261/0x370 [ 44.117433] ksys_mount+0xcf/0x130 [ 44.120963] __x64_sys_mount+0xba/0x150 [ 44.124920] ? lockdep_hardirqs_on+0x3c1/0x5e0 [ 44.129497] do_syscall_64+0xf9/0x670 [ 44.133283] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 44.138463] RIP: 0033:0x44766a [ 44.141645] 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 [ 44.160539] RSP: 002b:00007ffeac477c48 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 [ 44.168247] RAX: ffffffffffffffda RBX: 00007ffeac477ca0 RCX: 000000000044766a [ 44.175496] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffeac477c60 [ 44.182756] RBP: 00007ffeac477c60 R08: 00007ffeac477ca0 R09: 00007ffe00000015 [ 44.190004] R10: 0000000000000000 R11: 0000000000000297 R12: 000000000000002f [ 44.197260] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 44.205739] Kernel Offset: disabled [ 44.209397] Rebooting in 86400 seconds..