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Date: Mon, 09 Jun 2014 11:16:54 -0400 From: Sasha Levin <sasha.levin@...cle.com> To: Chris Mason <clm@...com>, jbacik@...com CC: LKML <linux-kernel@...r.kernel.org>, Dave Jones <davej@...hat.com>, linux-btrfs@...r.kernel.org Subject: btrfs: hang on boot due to tests 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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