loop: Write error at byte offset 0, length 4096.
blk_update_request: I/O error, dev loop0, sector 0
Buffer I/O error on dev loop0, logical block 0, lost async page write
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3973 at fs/buffer.c:1150 mark_buffer_dirty+0x26c/0x480 fs/buffer.c:1150
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3973 Comm: syz-executor5 Not tainted 4.9.128+ #46
 ffff8801d7d8f650 ffffffff81b2b9e9 ffffffff82a38c20 00000000ffffffff
 0000000000000000 0000000000000001 000000000000047e ffff8801d7d8f710
 ffffffff813f6665 0000000041b58ab3 ffffffff82e289c3 ffffffff813f64a6
Call Trace:
 [<ffffffff81b2b9e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b2b9e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff813f6665>] panic+0x1bf/0x39f kernel/panic.c:179
 [<ffffffff813f6934>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff810dbc7c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff815b825c>] mark_buffer_dirty+0x26c/0x480 fs/buffer.c:1150
 [<ffffffff815baf9c>] __block_commit_write.isra.10+0x13c/0x200 fs/buffer.c:2061
 [<ffffffff815bb0aa>] block_write_end+0x4a/0x100 fs/buffer.c:2139
 [<ffffffff815c6559>] blkdev_write_end+0x49/0x120 fs/block_dev.c:339
 [<ffffffff8140f26c>] generic_perform_write+0x34c/0x500 mm/filemap.c:2764
 [<ffffffff814120f2>] __generic_file_write_iter+0x352/0x540 mm/filemap.c:2878
 [<ffffffff815ca957>] blkdev_write_iter+0x1b7/0x370 fs/block_dev.c:1718
 [<ffffffff8150736b>] do_iter_readv_writev+0x3cb/0x4b0 fs/read_write.c:695
 [<ffffffff8150c0fc>] compat_do_readv_writev+0x2fc/0x7b0 fs/read_write.c:1089
 [<ffffffff8150cb35>] compat_writev+0xe5/0x150 fs/read_write.c:1227
 [<ffffffff8150cec2>] do_compat_pwritev64+0x152/0x180 fs/read_write.c:1275
 [<ffffffff8150f13b>] C_SYSC_pwritev fs/read_write.c:1295 [inline]
 [<ffffffff8150f13b>] compat_SyS_pwritev+0x3b/0x50 fs/read_write.c:1289
 [<ffffffff81006311>] do_syscall_32_irqs_on arch/x86/entry/common.c:328 [inline]
 [<ffffffff81006311>] do_fast_syscall_32+0x2f1/0xa10 arch/x86/entry/common.c:390
 [<ffffffff827f93a0>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137
Kernel Offset: disabled
Rebooting in 86400 seconds..