F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0)
F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop0): invalid crc value
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3799 at fs/f2fs/node.c:1185 __get_node_page.part.34+0x6bf/0x1030 fs/f2fs/node.c:1185
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3799 Comm: syzkaller604446 Not tainted 4.9.95-g13cc540 #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d929f618 ffffffff81eb0ba9 ffffffff83a484a0 00000000ffffffff
 0000000000000000 0000000000000001 00000000000004a1 ffff8801d929f6d8
 ffffffff8141f945 0000000041b58ab3 ffffffff841b7b88 ffffffff8141f786
Call Trace:
 [<ffffffff81eb0ba9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0ba9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8141f945>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff8141fc31>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff8113461c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff81c5401f>] __get_node_page.part.34+0x6bf/0x1030 fs/f2fs/node.c:1185
 [<ffffffff81c549b1>] __get_node_page fs/f2fs/node.c:1235 [inline]
 [<ffffffff81c549b1>] get_node_page.part.35+0x21/0x30 fs/f2fs/node.c:1237
 [<ffffffff81c595e0>] get_node_page fs/f2fs/node.c:1014 [inline]
 [<ffffffff81c595e0>] truncate_xattr_node+0x150/0x230 fs/f2fs/node.c:1014
 [<ffffffff81c61f2c>] remove_inode_page+0x12c/0x620 fs/f2fs/node.c:1039
 [<ffffffff81bc9bef>] f2fs_evict_inode+0xb1f/0x11e0 fs/f2fs/inode.c:547
 [<ffffffff815cbffe>] evict+0x22e/0x4f0 fs/inode.c:553
 [<ffffffff815cca91>] iput_final fs/inode.c:1516 [inline]
 [<ffffffff815cca91>] iput+0x371/0x900 fs/inode.c:1543
 [<ffffffff81c01288>] f2fs_fill_super+0x46b8/0x5d00 fs/f2fs/super.c:2853
 [<ffffffff81579d17>] mount_bdev+0x2c7/0x390 fs/super.c:1100
 [<ffffffff81beaa94>] f2fs_mount+0x34/0x40 fs/f2fs/super.c:3024
 [<ffffffff8157ba9c>] mount_fs+0x28c/0x370 fs/super.c:1206
 [<ffffffff815db041>] vfs_kern_mount.part.29+0xd1/0x3d0 fs/namespace.c:991
 [<ffffffff815e2969>] vfs_kern_mount fs/namespace.c:973 [inline]
 [<ffffffff815e2969>] do_new_mount fs/namespace.c:2512 [inline]
 [<ffffffff815e2969>] do_mount+0x3c9/0x2740 fs/namespace.c:2834
 [<ffffffff815e56be>] SYSC_mount fs/namespace.c:3050 [inline]
 [<ffffffff815e56be>] SyS_mount+0xfe/0x110 fs/namespace.c:3027
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f2313>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..