2015-08-02 15:55 GMT+03:00 kernel test robot <fengguang.wu@xxxxxxxxx>: > Greetings, > > 0day kernel testing robot got the below dmesg and the first bad commit is > So you have preemption enabled and some heavy debug options: CONFIG_GCOV_PROFILE_ALL=y CONFIG_KASAN=y > > [ 53.667591] xz_dec_test: Create a device node with 'mknod xz_dec_test c 250 0' and write .xz files to it. > [ 53.671288] rbtree testing But why is your vm so slow? Perhaps your host is overloaded so guests run too slow. E.g. mine guest reaches this point in less than 2 seconds. We could stick cond_resched() into for loops in rbtree_test_init(), but likely you just get soft lockup in some other place. > [ 80.140009] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper:1] > [ 80.140009] Modules linked in: > [ 80.140009] CPU: 0 PID: 1 Comm: swapper Not tainted 3.19.0-05243-gef7f0d6 #4 > [ 80.140009] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014 > [ 80.140009] task: ffff88000e4d0000 ti: ffff88000e4d8000 task.ti: ffff88000e4d8000 > [ 80.140009] RIP: 0010:[<ffffffff813bc3dc>] [<ffffffff813bc3dc>] __asan_store8+0x4c/0x140 > [ 80.140009] RSP: 0018:ffff88000e4dbd88 EFLAGS: 00000206 > [ 80.140009] RAX: 0000000086dfa090 RBX: ffffffff8413730f RCX: dffffc0000000000 > [ 80.140009] RDX: 0000000086dfa08f RSI: 0000000000000008 RDI: ffffffff84a3d468 > [ 80.140009] RBP: ffff88000e4dbdb8 R08: fffffbfff0826e61 R09: ffffffff8413730f > [ 80.140009] R10: 0000000026d79129 R11: 0000000026d6454e R12: 0000000026d6bb7e > [ 80.140009] R13: 1ffffffff0826e61 R14: 0000000000000010 R15: ffff88000e4dbdb8 > [ 80.140009] FS: 0000000000000000(0000) GS:ffffffff838b0000(0000) knlGS:0000000000000000 > [ 80.140009] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 80.140009] CR2: 0000000000000000 CR3: 000000000388a000 CR4: 00000000000006b0 > [ 80.140009] Stack: > [ 80.140009] ffff88000e4dbdf8 ffffffff84a3d440 ffffffff84a3cfb8 0000000000000002 > [ 80.140009] 00000000b4f0c03a ffffffff84a3d460 ffff88000e4dbdf8 ffffffff82d2a679 > [ 80.140009] 0000000026d79123 00000000000005c8 0000000000004094 00000034c1e9ef3c > [ 80.140009] Call Trace: > [ 80.140009] [<ffffffff82d2a679>] insert+0x9d/0xf1 > [ 80.140009] [<ffffffff844eef7e>] rbtree_test_init+0x98/0x32c > [ 80.140009] [<ffffffff810006a9>] do_one_initcall+0x409/0x570 > [ 80.140009] [<ffffffff844eeee6>] ? dynamic_debug_init+0x52a/0x52a > [ 80.140009] [<ffffffff8446d38b>] kernel_init_freeable+0x25a/0x3e4 > [ 80.140009] [<ffffffff811567d4>] ? finish_task_switch+0x274/0x4c0 > [ 80.140009] [<ffffffff82d142c0>] ? rest_init+0xe0/0xe0 > [ 80.140009] [<ffffffff82d142df>] kernel_init+0x1f/0x2b0 > [ 80.140009] [<ffffffff82d142c0>] ? rest_init+0xe0/0xe0 > [ 80.140009] [<ffffffff82d50ffa>] ret_from_fork+0x7a/0xb0 > [ 80.140009] [<ffffffff82d142c0>] ? rest_init+0xe0/0xe0 > [ 80.140009] Code: 01 48 39 c7 76 49 48 8b 15 42 ce 3f 03 48 b9 00 00 00 00 00 fc ff df 48 83 05 00 d2 3f 03 01 48 8d 42 01 48 83 05 04 d2 3f 03 01 <48> 89 05 1d ce 3f 03 48 89 f8 48 c1 e8 03 48 01 c8 66 83 38 00 > [ 80.140009] Kernel panic - not syncing: softlockup: hung tasks > [ 80.140009] CPU: 0 PID: 1 Comm: swapper Tainted: G L 3.19.0-05243-gef7f0d6 #4 > [ 80.140009] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014 > [ 80.140009] 0000000000000003 0000000000000003 0000000000000001 ffff88000e4dbc01 > [ 80.140009] 0000000000000000 ffffffff838b3da8 ffffffff82d28acb ffffffff838b3e38 > [ 80.140009] ffffffff82d1c785 ffffffff838b3e38 ffffffff00000008 ffffffff838b3e48 > [ 80.140009] Call Trace: > [ 80.140009] <IRQ> [<ffffffff82d28acb>] dump_stack+0x2e/0x3e > [ 80.140009] [<ffffffff82d1c785>] panic+0x1bb/0x4d6 > [ 80.140009] [<ffffffff81227d1e>] watchdog_timer_fn+0x46e/0x470 > [ 80.140009] [<ffffffff811b7aca>] hrtimer_run_queues+0x5aa/0xb30 > [ 80.140009] [<ffffffff812278b0>] ? watchdog+0x40/0x40 > [ 80.140009] [<ffffffff811b59cb>] update_process_times+0x3b/0xe0 > [ 80.140009] [<ffffffff811ddb6e>] tick_nohz_handler+0x15e/0x350 > [ 80.140009] [<ffffffff81071dd5>] local_apic_timer_interrupt+0x65/0xb0 > [ 80.140009] [<ffffffff81072245>] smp_apic_timer_interrupt+0x85/0xb0 > [ 80.140009] [<ffffffff82d51dfb>] apic_timer_interrupt+0x6b/0x70 > [ 80.140009] <EOI> [<ffffffff813bc3dc>] ? __asan_store8+0x4c/0x140 > [ 80.140009] [<ffffffff82d2a679>] insert+0x9d/0xf1 > [ 80.140009] [<ffffffff844eef7e>] rbtree_test_init+0x98/0x32c > [ 80.140009] [<ffffffff810006a9>] do_one_initcall+0x409/0x570 > [ 80.140009] [<ffffffff844eeee6>] ? dynamic_debug_init+0x52a/0x52a > [ 80.140009] [<ffffffff8446d38b>] kernel_init_freeable+0x25a/0x3e4 > [ 80.140009] [<ffffffff811567d4>] ? finish_task_switch+0x274/0x4c0 > [ 80.140009] [<ffffffff82d142c0>] ? rest_init+0xe0/0xe0 > [ 80.140009] [<ffffffff82d142df>] kernel_init+0x1f/0x2b0 > [ 80.140009] [<ffffffff82d142c0>] ? rest_init+0xe0/0xe0 > [ 80.140009] [<ffffffff82d50ffa>] ret_from_fork+0x7a/0xb0 > [ 80.140009] [<ffffffff82d142c0>] ? rest_init+0xe0/0xe0 > [ 80.140009] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff) > > Elapsed time: 110 > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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