[ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.244' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 44.986328][ T6850] F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0) [ 44.994444][ T6850] F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock [ 45.005124][ T6850] F2FS-fs (loop0): invalid crc_offset: 0 [ 45.018430][ T6850] F2FS-fs (loop0): f2fs_check_nid_range: out-of-range nid=1, run fsck to fix. [ 45.027787][ T6850] F2FS-fs (loop0): f2fs_check_nid_range: out-of-range nid=2, run fsck to fix. [ 45.053057][ T6850] F2FS-fs (loop0): access invalid blkaddr:1030372864 [ 45.059877][ T6850] ------------[ cut here ]------------ [ 45.065390][ T6850] WARNING: CPU: 1 PID: 6850 at fs/f2fs/checkpoint.c:189 f2fs_is_valid_blkaddr+0xa78/0xf00 [ 45.075326][ T6850] Kernel panic - not syncing: panic_on_warn set ... [ 45.081907][ T6850] CPU: 1 PID: 6850 Comm: syz-executor727 Not tainted 5.9.0-rc6-syzkaller #0 [ 45.090568][ T6850] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.100682][ T6850] Call Trace: [ 45.103950][ T6850] dump_stack+0x1d6/0x29e [ 45.108269][ T6850] panic+0x2c0/0x800 [ 45.112152][ T6850] ? __warn+0x102/0x250 [ 45.116282][ T6850] ? f2fs_is_valid_blkaddr+0xa78/0xf00 [ 45.121723][ T6850] ? f2fs_is_valid_blkaddr+0xa78/0xf00 [ 45.127166][ T6850] __warn+0x227/0x250 [ 45.131138][ T6850] ? f2fs_is_valid_blkaddr+0xa78/0xf00 [ 45.136671][ T6850] report_bug+0x1b1/0x2e0 [ 45.140975][ T6850] handle_bug+0x42/0x80 [ 45.145109][ T6850] exc_invalid_op+0x16/0x40 [ 45.149605][ T6850] asm_exc_invalid_op+0x12/0x20 [ 45.154430][ T6850] RIP: 0010:f2fs_is_valid_blkaddr+0xa78/0xf00 [ 45.160466][ T6850] Code: 48 c7 c6 5c 7f 36 89 44 89 f2 31 c0 e8 21 40 fd ff 48 8d bd b8 00 00 00 be 08 00 00 00 e8 30 5c 60 fe f0 80 8d b8 00 00 00 04 <0f> 0b e9 72 fd ff ff e8 fc be 20 fe 31 db e9 66 fd ff ff e8 f0 be [ 45.180056][ T6850] RSP: 0018:ffffc900013af660 EFLAGS: 00010206 [ 45.186106][ T6850] RAX: 9e0c757fcbfb6801 RBX: 0000000000000000 RCX: ffffffff83544e20 [ 45.194052][ T6850] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88808894c0b8 [ 45.202019][ T6850] RBP: ffff88808894c000 R08: dffffc0000000000 R09: ffffed1011129818 [ 45.209963][ T6850] R10: ffffed1011129818 R11: 0000000000000000 R12: 0000000000000007 [ 45.217918][ T6850] R13: ffff88809e873c00 R14: 000000003d6a3e00 R15: dffffc0000000000 [ 45.225875][ T6850] ? f2fs_is_valid_blkaddr+0xa70/0xf00 [ 45.231311][ T6850] f2fs_get_node_info+0x6c6/0x1610 [ 45.236481][ T6850] ? local_lock_release+0x96/0x170 [ 45.241565][ T6850] read_node_page+0x385/0x8d0 [ 45.246238][ T6850] __get_node_page+0x37b/0x16a0 [ 45.251067][ T6850] ? iget_locked+0x77b/0x890 [ 45.255633][ T6850] f2fs_iget+0x4d2/0x4040 [ 45.260000][ T6850] ? f2fs_build_stats+0x7d7/0xda0 [ 45.265014][ T6850] ? f2fs_build_stats+0x7d7/0xda0 [ 45.270018][ T6850] ? __mutex_unlock_slowpath+0x12d/0x590 [ 45.275630][ T6850] ? f2fs_build_stats+0x7d7/0xda0 [ 45.280641][ T6850] f2fs_fill_super+0x6f4c/0x9880 [ 45.285563][ T6850] ? bdev_name+0x298/0x3b0 [ 45.290003][ T6850] mount_bdev+0x24f/0x360 [ 45.294370][ T6850] ? kill_f2fs_super+0x2b0/0x2b0 [ 45.299292][ T6850] legacy_get_tree+0xea/0x180 [ 45.303952][ T6850] ? trace_raw_output_f2fs_fiemap+0x210/0x210 [ 45.310008][ T6850] vfs_get_tree+0x88/0x270 [ 45.314416][ T6850] path_mount+0x179d/0x29e0 [ 45.318898][ T6850] __se_sys_mount+0x126/0x180 [ 45.323641][ T6850] do_syscall_64+0x31/0x70 [ 45.328041][ T6850] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.333904][ T6850] RIP: 0033:0x44708a [ 45.337770][ T6850] 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 [ 45.357450][ T6850] RSP: 002b:00007ffd71d1aaf8 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 [ 45.365851][ T6850] RAX: ffffffffffffffda RBX: 00007ffd71d1ab50 RCX: 000000000044708a [ 45.373811][ T6850] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffd71d1ab10 [ 45.381774][ T6850] RBP: 00007ffd71d1ab10 R08: 00007ffd71d1ab50 R09: 00007ffd00000015 [ 45.389723][ T6850] R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000009 [ 45.397666][ T6850] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 45.407285][ T6850] Kernel Offset: disabled [ 45.411669][ T6850] Rebooting in 86400 seconds..