Hi all,
It seems that some recent changes to btrfs tests make it hang during boot:
[ 49.730033] NMI watchdog: BUG: soft lockup - CPU#34 stuck for 23s!
[swapper/0:1]
[ 49.730033] Modules linked in:
[ 49.730033] hardirqs last enabled at (6389143): restore_args
(arch/x86/kernel/entry_64.S:829)
[ 49.730033] hardirqs last disabled at (6389144): apic_timer_interrupt
(arch/x86/kernel/entry_64.S:1021)
[ 49.730033] softirqs last enabled at (6389142): __do_softirq
(./arch/x86/include/asm/preempt.h:22 kernel/softirq.c:296)
[ 49.730033] softirqs last disabled at (6389139): irq_exit
(kernel/softirq.c:346 kernel/softirq.c:387)
[ 49.730033] CPU: 34 PID: 1 Comm: swapper/0 Not tainted
3.15.0-rc8-next-20140606-sasha-00021-ga9d3a0b-dirty #597
[ 49.730033] task: ffff880628550000 ti: ffff880036218000 task.ti:
ffff880036218000
[ 49.730033] RIP: __write_lock_failed (arch/x86/lib/rwlock.S:20)
[ 49.730033] RSP: 0000:ffff88003621b9e8 EFLAGS: 00000297
[ 49.730033] RAX: 0000000000000022 RBX: ffffffff845658fb RCX: 000000059e1d8462
[ 49.730033] RDX: 0000000000000003 RSI: ffffffff85907bf4 RDI: ffff8800365c00bc
[ 49.730033] RBP: ffff88003621b9e8 R08: 0000000000001b48 R09: ffffffff819618b8
[ 49.730033] R10: 0000000000000001 R11: 0000000000000000 R12: ffff88003621b958
[ 49.730033] R13: 0000000000000001 R14: ffff880036218000 R15: ffff880628550000
[ 49.730033] FS: 0000000000000000(0000) GS:ffff8800a6e00000(0000)
knlGS:0000000000000000
[ 49.730033] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 49.730033] CR2: 00000000ffffffff CR3: 000000000602e000 CR4: 00000000000006a0
[ 49.730033] Stack:
[ 49.730033] ffff88003621ba08 ffffffff811d18de ffff88003621ba68
ffff8800365c00b8
[ 49.730033] ffff88003621ba38 ffffffff84563ac0 ffffffff81961d7c
ffffffff81b33a05
[ 49.730033] ffff8800365c0000 ffff8800365c0100 ffff88003621baa8
ffffffff81961d7c
[ 49.730033] Call Trace:
[ 49.730033] do_raw_write_lock (kernel/locking/spinlock_debug.c:236
kernel/locking/spinlock_debug.c:280)
[ 49.730033] _raw_write_lock (include/linux/rwlock_api_smp.h:211
kernel/locking/spinlock.c:295)
[ 49.730033] ? btrfs_tree_lock (./arch/x86/include/asm/atomic.h:27
fs/btrfs/locking.c:219)
[ 49.730033] ? delay_tsc (./arch/x86/include/asm/preempt.h:98
arch/x86/lib/delay.c:86)
[ 49.730033] btrfs_tree_lock (./arch/x86/include/asm/atomic.h:27
fs/btrfs/locking.c:219)
[ 49.730033] ? __const_udelay (arch/x86/lib/delay.c:126)
[ 49.730033] ? __rcu_read_unlock (kernel/rcu/update.c:97)
[ 49.730033] btrfs_lock_root_node (fs/btrfs/ctree.c:193)
[ 49.730033] btrfs_search_slot (fs/btrfs/ctree.c:2768)
[ 49.730033] btrfs_insert_empty_items (fs/btrfs/ctree.c:4836)
[ 49.730033] ? dlm_init (fs/btrfs/super.c:1914)
[ 49.730033] insert_normal_tree_ref.constprop.4
(fs/btrfs/tests/qgroup-tests.c:60)
[ 49.730033] ? dlm_init (fs/btrfs/super.c:1914)
[ 49.730033] test_no_shared_qgroup (fs/btrfs/tests/qgroup-tests.c:249)
[ 49.730033] btrfs_test_qgroups (fs/btrfs/tests/qgroup-tests.c:462)
[ 49.730033] init_btrfs_fs (fs/btrfs/super.c:1909 fs/btrfs/super.c:1969)
[ 49.730033] ? dlm_init (fs/btrfs/super.c:1914)
[ 49.730033] do_one_initcall (init/main.c:791)
[ 49.730033] ? parse_args (kernel/params.c:120 kernel/params.c:205)
[ 49.730033] kernel_init_freeable (init/main.c:856 init/main.c:865
init/main.c:884 init/main.c:1005)
[ 49.730033] ? loglevel (init/main.c:241)
[ 49.730033] ? rest_init (init/main.c:932)
[ 49.730033] kernel_init (init/main.c:937)
[ 49.730033] ret_from_fork (arch/x86/kernel/entry_64.S:349)
[ 49.730033] ? rest_init (init/main.c:932)
[ 49.730033] Code: 1f 00 48 89 01 31 c0 0f 1f 00 c3 b8 f2 ff ff ff 0f 1f 00 c3
90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 f0 ff 07 f3 90 <83> 3f 01
75 f9 f0 ff 0f 75 f1 5d c3 66 66 2e 0f 1f 84 00 00 00
All code
========
0: 1f (bad)
1: 00 48 89 add %cl,-0x77(%rax)
4: 01 31 add %esi,(%rcx)
6: c0 0f 1f rorb $0x1f,(%rdi)
9: 00 c3 add %al,%bl
b: b8 f2 ff ff ff mov $0xfffffff2,%eax
10: 0f 1f 00 nopl (%rax)
13: c3 retq
14: 90 nop
15: 90 nop
16: 90 nop
17: 90 nop
18: 90 nop
19: 90 nop
1a: 90 nop
1b: 90 nop
1c: 90 nop
1d: 90 nop
1e: 90 nop
1f: 90 nop
20: 90 nop
21: 90 nop
22: 55 push %rbp
23: 48 89 e5 mov %rsp,%rbp
26: f0 ff 07 lock incl (%rdi)
29: f3 90 pause
2b:* 83 3f 01 cmpl $0x1,(%rdi) <-- trapping
instruction
2e: 75 f9 jne 0x29
30: f0 ff 0f lock decl (%rdi)
33: 75 f1 jne 0x26
35: 5d pop %rbp
36: c3 retq
37: 66 data16
38: 66 data16
39: 2e cs
3a: 0f .byte 0xf
3b: 1f (bad)
3c: 84 00 test %al,(%rax)
3e: 00 00 add %al,(%rax)
...
Code starting with the faulting instruction
===========================================
0: 83 3f 01 cmpl $0x1,(%rdi)
3: 75 f9 jne 0xfffffffffffffffe
5: f0 ff 0f lock decl (%rdi)
8: 75 f1 jne 0xfffffffffffffffb
a: 5d pop %rbp
b: c3 retq
c: 66 data16
d: 66 data16
e: 2e cs
f: 0f .byte 0xf
10: 1f (bad)
11: 84 00 test %al,(%rax)
13: 00 00 add %al,(%rax)
...
[ 49.730033] Kernel panic - not syncing: softlockup: hung tasks
[ 49.730033] CPU: 34 PID: 1 Comm: swapper/0 Not tainted
3.15.0-rc8-next-20140606-sasha-00021-ga9d3a0b-dirty #597
[ 49.730033] ffff880628550000 ffff8800a6e03dd8 ffffffff8451770c
0000000000000001
[ 49.730033] ffffffff856ec784 ffff8800a6e03e58 ffffffff8450952f
0000000000003556
[ 49.730033] ffff880600000008 ffff8800a6e03e68 ffff8800a6e03e08
000000000000353e
[ 49.730033] Call Trace:
[ 49.730033] <IRQ> dump_stack (lib/dump_stack.c:52)
[ 49.730033] panic (kernel/panic.c:119)
[ 49.730033] watchdog_timer_fn (kernel/watchdog.c:372)
[ 49.730033] __run_hrtimer (kernel/hrtimer.c:1268 (discriminator 2))
[ 49.730033] ? watchdog (kernel/hung_task.c:191 kernel/hung_task.c:232)
[ 49.730033] hrtimer_interrupt (kernel/hrtimer.c:1915)
[ 49.730033] local_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:921)
[ 49.730033] ? btrfs_tree_read_lock (./arch/x86/include/asm/atomic.h:27
fs/btrfs/locking.c:103)
[ 49.730033] smp_apic_timer_interrupt (./arch/x86/include/asm/apic.h:696
arch/x86/kernel/apic/apic.c:945)
[ 49.730033] apic_timer_interrupt (arch/x86/kernel/entry_64.S:1021)
[ 49.730033] <EOI> ? retint_restore_args (arch/x86/kernel/entry_64.S:829)
[ 49.730033] ? btrfs_tree_read_lock (./arch/x86/include/asm/atomic.h:27
fs/btrfs/locking.c:103)
[ 49.730033] ? __write_lock_failed (arch/x86/lib/rwlock.S:20)
[ 49.730033] do_raw_write_lock (kernel/locking/spinlock_debug.c:236
kernel/locking/spinlock_debug.c:280)
[ 49.730033] _raw_write_lock (include/linux/rwlock_api_smp.h:211
kernel/locking/spinlock.c:295)
[ 49.730033] ? btrfs_tree_lock (./arch/x86/include/asm/atomic.h:27
fs/btrfs/locking.c:219)
[ 49.730033] ? delay_tsc (./arch/x86/include/asm/preempt.h:98
arch/x86/lib/delay.c:86)
[ 49.730033] btrfs_tree_lock (./arch/x86/include/asm/atomic.h:27
fs/btrfs/locking.c:219)
[ 49.730033] ? __const_udelay (arch/x86/lib/delay.c:126)
[ 49.730033] ? __rcu_read_unlock (kernel/rcu/update.c:97)
[ 49.730033] btrfs_lock_root_node (fs/btrfs/ctree.c:193)
[ 49.730033] btrfs_search_slot (fs/btrfs/ctree.c:2768)
[ 49.730033] btrfs_insert_empty_items (fs/btrfs/ctree.c:4836)
[ 49.730033] ? dlm_init (fs/btrfs/super.c:1914)
[ 49.730033] insert_normal_tree_ref.constprop.4
(fs/btrfs/tests/qgroup-tests.c:60)
[ 49.730033] ? dlm_init (fs/btrfs/super.c:1914)
[ 49.730033] test_no_shared_qgroup (fs/btrfs/tests/qgroup-tests.c:249)
[ 49.730033] btrfs_test_qgroups (fs/btrfs/tests/qgroup-tests.c:462)
[ 49.730033] init_btrfs_fs (fs/btrfs/super.c:1909 fs/btrfs/super.c:1969)
[ 49.730033] ? dlm_init (fs/btrfs/super.c:1914)
[ 49.730033] do_one_initcall (init/main.c:791)
[ 49.730033] ? parse_args (kernel/params.c:120 kernel/params.c:205)
[ 49.730033] kernel_init_freeable (init/main.c:856 init/main.c:865
init/main.c:884 init/main.c:1005)
[ 49.730033] ? loglevel (init/main.c:241)
[ 49.730033] ? rest_init (init/main.c:932)
[ 49.730033] kernel_init (init/main.c:937)
[ 49.730033] ret_from_fork (arch/x86/kernel/entry_64.S:349)
[ 49.730033] ? rest_init (init/main.c:932)
[ 49.730033] Dumping ftrace buffer:
[ 49.730033] (ftrace buffer empty)
[ 49.730033] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range:
0xffffffff80000000-0xffffffff9fffffff)
Thanks,
Sasha
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