https://bugzilla.kernel.org/show_bug.cgi?id=86471 --- Comment #7 from Markus Königshaus <m.koenigshaus@xxxxxx> --- Addition: I have identified the code that generates the underflow: cancel_dirty_page in mm/truncate.c. To reproduce the error, you can perform the following change: [...] if (mapping && mapping_cap_account_dirty (mapping)) { ++WARN_ON ((int) global_page_state(NR_FILE_DIRTY) <0); dec_zone_page_state (page, NR_FILE_DIRTY); [...] Test result: [ 21.427121] ------------[ cut here ]------------ [ 21.431769] WARNING: CPU: 0 PID: 309 at mm/truncate.c:78 cancel_dirty_page+0x144/0x1cc() [ 21.439899] Modules linked in: wutbox_cp sata_mv [ 21.444572] CPU: 0 PID: 309 Comm: kworker/0:1 Not tainted 3.14.21-WuT #77 [ 21.451395] Workqueue: events free_ioctx [ 21.455362] [<c0016a64>] (unwind_backtrace) from [<c0012f88>] (show_stack+0x20/0x24) [ 21.463164] [<c0012f88>] (show_stack) from [<c03f8bec>] (dump_stack+0x24/0x28) [ 21.470441] [<c03f8bec>] (dump_stack) from [<c0023ae4>] (warn_slowpath_common+0x84/0x9c) [ 21.478577] [<c0023ae4>] (warn_slowpath_common) from [<c0023bb8>] (warn_slowpath_null+0x2c/0x34) [ 21.487402] [<c0023bb8>] (warn_slowpath_null) from [<c00c05f0>] (cancel_dirty_page+0x144/0x1cc) [ 21.496125] [<c00c05f0>] (cancel_dirty_page) from [<c00c073c>] (truncate_inode_page+0x8c/0x158) [ 21.504874] [<c00c073c>] (truncate_inode_page) from [<c00c09c4>] (truncate_inode_pages_range+0x11c/0x53c) [ 21.514493] [<c00c09c4>] (truncate_inode_pages_range) from [<c00c0e9c>] (truncate_pagecache+0x88/0xac) [ 21.523855] [<c00c0e9c>] (truncate_pagecache) from [<c00c0f1c>] (truncate_setsize+0x5c/0x74) [ 21.532332] [<c00c0f1c>] (truncate_setsize) from [<c013b2d8>] (put_aio_ring_file.isra.14+0x34/0x90) [ 21.541428] [<c013b2d8>] (put_aio_ring_file.isra.14) from [<c013b354>] (aio_free_ring+0x20/0xcc) [ 21.550262] [<c013b354>] (aio_free_ring) from [<c013b424>] (free_ioctx+0x24/0x44) [ 21.557791] [<c013b424>] (free_ioctx) from [<c003d8d8>] (process_one_work+0x134/0x47c) [ 21.565732] [<c003d8d8>] (process_one_work) from [<c003e988>] (worker_thread+0x130/0x414) [ 21.575225] [<c003e988>] (worker_thread) from [<c00448ac>] (kthread+0xd4/0xec) [ 21.590695] [<c00448ac>] (kthread) from [<c000ec18>] (ret_from_fork+0x14/0x20) [ 21.600721] ---[ end trace a9d8eecdd373e997 ]--- The error only occurs when the Kernel Asynchronous I/O is used. Without AIO I get no error. Markus -- You are receiving this mail because: You are watching the assignee of the bug.-- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
