While repeatedly running 'aiostress -O -o 2' test I've got in /var/log/messages:
BUG: warning at mm/truncate.c:398/invalidate_inode_pages2_range() Call Trace: [<ffffffff802573c3>] invalidate_inode_pages2_range+0x236/0x26b [<ffffffff802af77b>] ext3_direct_IO+0x16c/0x19e [<ffffffff802adc1d>] ext3_get_block+0x0/0xe2 [<ffffffff802518c0>] generic_file_direct_IO+0xb9/0xcf [<ffffffff8025193d>] generic_file_direct_write+0x67/0x10e [<ffffffff80252308>] __generic_file_aio_write_nolock+0x2d6/0x3fe [<ffffffff802082c0>] __switch_to+0x26f/0x27e [<ffffffff8047b8e9>] thread_return+0x0/0xd8 [<ffffffff80252497>] generic_file_aio_write+0x67/0xc7 [<ffffffff802ab2cc>] ext3_file_write+0x0/0x8f [<ffffffff802ab2e2>] ext3_file_write+0x16/0x8f [<ffffffff802ab2cc>] ext3_file_write+0x0/0x8f [<ffffffff80283f61>] aio_rw_vect_retry+0x72/0x14f [<ffffffff80284ad9>] aio_run_iocb+0xe6/0x187 [<ffffffff802853e2>] io_submit_one+0x296/0x2e3 [<ffffffff80285979>] sys_io_submit+0x9b/0x108 [<ffffffff80229b49>] default_wake_function+0x0/0xe [<ffffffff8020983e>] system_call+0x7e/0x83 ----------- [cut here ] --------- [please bite here ] --------- Kernel BUG at fs/aio.c:509 invalid opcode: 0000 [1] SMP CPU 1 Modules linked in: firmware_class Pid: 11362, comm: aiostress Not tainted 2.6.19 #1 RIP: 0010:[<ffffffff802841ea>] [<ffffffff802841ea>] __aio_put_req+0x27/0x162 RSP: 0018:ffff81000c167e88 EFLAGS: 00010096 RAX: 00000000ffffffff RBX: ffff8100184f8dc0 RCX: 000000001d44f000 RDX: 000000000000000d RSI: ffff8100184f8dc0 RDI: ffff81001d44ee80 RBP: ffff81001d44ee80 R08: 6db6db6db6db6db7 R09: ffff810001000000 R10: 0000000000000000 R11: 0000000000000046 R12: ffff810037341c80 R13: ffff81001d44ee80 R14: 0000000000606998 R15: 0000000000000000 FS: 00002ab979b0ee90(0000) GS:ffff810037e896c0(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002aea207c3950 CR3: 000000001009c000 CR4: 00000000000006e0 Process aiostress (pid: 11362, threadinfo ffff81000c166000, task ffff81003f49f5a0) Stack: ffff8100184f8dc0 ffff81001d44ee80 ffff810037341c80 ffffffff80284ff6 ffff8100184f8dc0 ffff8100184f8dc0 0000000000000000 ffffffff80285409 0000000000607fb0 ffff81001d44ee80 0000000000606998 0000000000000001 Call Trace: [<ffffffff80284ff6>] aio_put_req+0x21/0x59 ffffffff80284ff1: e8 cd f1 ff ff callq ffffffff802841c3 <__aio_put_req> [<ffffffff80285409>] io_submit_one+0x2bd/0x2e3 [<ffffffff80285979>] sys_io_submit+0x9b/0x108 [<ffffffff80229b49>] default_wake_function+0x0/0xe [<ffffffff8020983e>] system_call+0x7e/0x83 Code: 0f 0b 68 76 e6 4a 80 c2 fd 01 85 c0 74 07 31 c0 e9 21 01 00 RIP [<ffffffff802841ea>] __aio_put_req+0x27/0x162 RSP <ffff81000c167e88> NMI Watchdog detected LOCKUP on CPU 1 CPU 1 Modules linked in: firmware_class Pid: 11362, comm: aiostress Not tainted 2.6.19 #1 RIP: 0010:[<ffffffff8047d3f5>] [<ffffffff8047d3f5>] _spin_lock_irq+0x8/0x10 RSP: 0018:ffff81000c167c10 EFLAGS: 00000086 RAX: ffff81003e0f0001 RBX: ffff81001d44ee80 RCX: 00002ab979b0ef40 RDX: 0000000000000000 RSI: 0000000000000246 RDI: ffff81001d44eeb8 RBP: ffff81001d44ee80 R08: 0000000000000286 R09: 0000000000000018 R10: 0000000000000286 R11: 0000000000000046 R12: 0000000000000001 R13: 000000000000000b R14: ffffffff804a5904 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff810037e896c0(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002aea207c3950 CR3: 000000001009c000 CR4: 00000000000006e0 Process aiostress (pid: 11362, threadinfo ffff81000c166000, task ffff81003f49f5a0) Stack: ffffffff80284050 0000000000000286 ffffffff802441cc 0000000000000018 ffffffff8047cebe 0000000000000246 ffff81001d44ee80 0000000000000000 ffffffff80285880 ffff81003e0f12c0 ffff81003e0f12c0 ffff81003f49f5a0 Call Trace: [<ffffffff80284050>] aio_cancel_all+0x12/0x87 0x12: e8 9d 93 1f 00 callq ffffffff8047d3ed <_spin_lock_irq> [<ffffffff802441cc>] lock_hrtimer_base+0x26/0x4c [<ffffffff8047cebe>] __down_read+0x12/0x9a [<ffffffff80285880>] exit_aio+0x2e/0x8c [<ffffffff8022d904>] mmput+0x19/0x98 [<ffffffff80232be9>] do_exit+0x1f7/0x825 [<ffffffff80321799>] vgacon_set_cursor_size+0x36/0xd1 [<ffffffff8020b228>] kernel_math_error+0x0/0x90 [<ffffffff8020baf4>] do_invalid_op+0xad/0xb7 [<ffffffff802841ea>] __aio_put_req+0x27/0x162 [<ffffffff80252308>] __generic_file_aio_write_nolock+0x2d6/0x3fe [<ffffffff802082c0>] __switch_to+0x26f/0x27e [<ffffffff8047d5fd>] error_exit+0x0/0x84 [<ffffffff802841ea>] __aio_put_req+0x27/0x162 [<ffffffff80284ff6>] aio_put_req+0x21/0x59 [<ffffffff80285409>] io_submit_one+0x2bd/0x2e3 [<ffffffff80285979>] sys_io_submit+0x9b/0x108 [<ffffffff80229b49>] default_wake_function+0x0/0xe [<ffffffff8020983e>] system_call+0x7e/0x83 Code: 83 3f 00 7e f9 eb f2 c3 53 48 89 fb e8 06 7b db ff f0 ff 0b <1>Fixing recursive fault but reboot is needed! ======================================================================== ======================= It stable happens after 2-5 aiosterss runs on 2.6.20-rc6 as well as on 2.6.19 in 4 processor Xeon. fs/aio.c:509 line is BUG_ON(req->ki_users < 0); It may be an effect of return 1 from invalidate_inode_pages2_range() one second earlier as you can see in log. To investigate a root cause of ret=0 in invalidate_inode_pages2_range() I have added printk() calls. As a result I can say that invalidate_inode_pages2_range() reports BUG: warning at mm/truncate.c:398 occurs becouse of invalidate_complete_page2() returns 0; it returns 0 because of try_to_release_page() returns 0; it returns 0 because of ext3_releasepage() returns 0; it returns 0 because of journal_try_to_free_buffers() returns 0; it returns 0 because of try_to_free_buffers() returns 0; it returns 0 because of drop_buffers() returns 0; it returns 0 because of buffer_busy(bh) returns 1; it returns 0 because of buffer_head count is 1 (bh->b_count==1) as additional printk reports. Leonid - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/