------------[ cut here ]------------ WARNING: CPU: 2 PID: 353 at fs/buffer.c:1128 mark_buffer_dirty+0x4fa/0x690 fs/buffer.c:1128 Kernel panic - not syncing: panic_on_warn set ... CPU: 2 PID: 353 Comm: kworker/u17:4 Not tainted 5.6.0-rc4-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+0x188/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x35 kernel/panic.c:582 report_bug+0x27b/0x2f0 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+0x12b/0x220 arch/x86/kernel/traps.c:267 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:mark_buffer_dirty+0x4fa/0x690 fs/buffer.c:1128 Code: 03 80 3c 02 00 0f 85 99 01 00 00 48 8b 3b be 04 00 00 00 e8 08 e5 fc ff 5b 5d 41 5c 41 5d 41 5e e9 8b d6 a9 ff e8 86 d6 a9 ff <0f> 0b e9 4f fb ff ff e8 7a d6 a9 ff 0f 0b e9 73 fb ff ff e8 6e d6 RSP: 0018:ffffc90001857010 EFLAGS: 00010293 RAX: ffff88802a2c9b00 RBX: ffff888023df0150 RCX: ffffffff81c83827 RDX: 0000000000000000 RSI: ffffffff81c83cda RDI: 0000000000000001 RBP: 0000000000000000 R08: ffff88802a2c9b00 R09: ffffed10047be02b R10: ffffed10047be02a R11: ffff888023df0157 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8880246a9300 R15: ffff88801b8b493c __ext4_handle_dirty_metadata+0x41d/0x7a0 fs/ext4/ext4_jbd2.c:338 ext4_mb_mark_diskspace_used+0x943/0x10e0 fs/ext4/mballoc.c:3048 ext4_mb_new_blocks+0xb25/0x3930 fs/ext4/mballoc.c:4579 ext4_ext_map_blocks+0x221c/0x37d0 fs/ext4/extents.c:4440 ext4_map_blocks+0x4cb/0x1650 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+0x12a/0x1410 fs/fs-writeback.c:1452 writeback_sb_inodes+0x515/0xdd0 fs/fs-writeback.c:1716 __writeback_inodes_wb+0xc3/0x250 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+0xb50/0x11c0 fs/fs-writeback.c:2078 process_one_work+0x94b/0x1690 kernel/workqueue.c:2264 worker_thread+0x96/0xe20 kernel/workqueue.c:2410 kthread+0x357/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..