Buffer I/O error on dev loop0, logical block 9, lost async page write ------------[ cut here ]------------ WARNING: CPU: 1 PID: 3938 at fs/buffer.c:1150 mark_buffer_dirty+0x37a/0x480 fs/buffer.c:1150 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 3938 Comm: syz-executor7 Not tainted 4.9.63-g44a3afc #92 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801ce0c7428 ffffffff81d94429 ffffffff83a46d00 ffff8801ce0c7500 ffffffff83acbd00 ffffffff8161cdca 0000000000000009 ffff8801ce0c74f0 ffffffff814304e1 0000000041b58ab3 ffffffff84186a90 ffffffff81430325 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] panic+0x1bc/0x3a8 kernel/panic.c:179 [] __warn+0x1c4/0x1e0 kernel/panic.c:542 [] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585 [] mark_buffer_dirty+0x37a/0x480 fs/buffer.c:1150 [] __block_commit_write.isra.32+0xd6/0x200 fs/buffer.c:2061 [] block_write_end+0x4a/0x100 fs/buffer.c:2139 [] blkdev_write_end+0x49/0x120 fs/block_dev.c:339 [] generic_perform_write+0x310/0x500 mm/filemap.c:2752 [] __generic_file_write_iter+0x348/0x570 mm/filemap.c:2866 [] blkdev_write_iter+0x1bc/0x380 fs/block_dev.c:1718 [] vfs_iter_write+0x2e0/0x450 fs/read_write.c:393 [] iter_file_splice_write+0x5b5/0xb60 fs/splice.c:768 [] do_splice_from fs/splice.c:870 [inline] [] direct_splice_actor+0x125/0x180 fs/splice.c:1037 [] splice_direct_to_actor+0x2cc/0x800 fs/splice.c:992 [] do_splice_direct+0x1a7/0x270 fs/splice.c:1080 [] do_sendfile+0x54b/0xd30 fs/read_write.c:1401 [] SYSC_sendfile64 fs/read_write.c:1456 [inline] [] SyS_sendfile64+0xd1/0x160 fs/read_write.c:1448 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..