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WARNING: CPU: 0 PID: 54 at fs/buffer.c:1128 mark_buffer_dirty+0x524/0x6c0 fs/buffer.c:1128
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 54 Comm: kworker/u17:3 Not tainted 5.6.0-rc2-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:221
 __warn.cold+0x2f/0x3e kernel/panic.c:582
 report_bug+0x289/0x300 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 fixup_bug arch/x86/kernel/traps.c:169 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:mark_buffer_dirty+0x524/0x6c0 fs/buffer.c:1128
Code: 02 00 0f 85 9e 01 00 00 48 8b 3b be 04 00 00 00 e8 71 c9 fc ff e8 ec 13 a7 ff 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 dc 13 a7 ff <0f> 0b e9 2c fb ff ff e8 d0 13 a7 ff 0f 0b e9 53 fb ff ff e8 c4 13
RSP: 0000:ffffc90000706fb8 EFLAGS: 00010293
RAX: ffff88802c310e80 RBX: ffff888023f25dc8 RCX: ffffffff81ce6f0e
RDX: 0000000000000000 RSI: ffffffff81ce73e4 RDI: 0000000000000001
RBP: ffffc90000706fe0 R08: ffff88802c310e80 R09: ffffed10047e4bba
R10: ffffed10047e4bb9 R11: ffff888023f25dcf R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffffc90000707108
 __ext4_handle_dirty_metadata+0x421/0x7a0 fs/ext4/ext4_jbd2.c:338
 ext4_mb_mark_diskspace_used+0x9e7/0x10d0 fs/ext4/mballoc.c:3029
 ext4_mb_new_blocks+0xade/0x3900 fs/ext4/mballoc.c:4560
 ext4_ext_map_blocks+0x23c9/0x3ac0 fs/ext4/extents.c:4440
 ext4_map_blocks+0x52b/0x17e0 fs/ext4/inode.c:622
 mpage_map_one_extent fs/ext4/inode.c:2365 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2418 [inline]
 ext4_writepages+0x19eb/0x3080 fs/ext4/inode.c:2772
 do_writepages+0xfa/0x2a0 mm/page-writeback.c:2344
 __writeback_single_inode+0x136/0x1400 fs/fs-writeback.c:1452
 writeback_sb_inodes+0x596/0xf20 fs/fs-writeback.c:1716
 __writeback_inodes_wb+0xc3/0x260 fs/fs-writeback.c:1785
 wb_writeback+0x910/0xd90 fs/fs-writeback.c:1894
 wb_check_old_data_flush fs/fs-writeback.c:1996 [inline]
 wb_do_writeback fs/fs-writeback.c:2049 [inline]
 wb_workfn+0xbc1/0x1280 fs/fs-writeback.c:2078
 process_one_work+0xa05/0x17a0 kernel/workqueue.c:2264
 worker_thread+0x98/0xe40 kernel/workqueue.c:2410
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..