Hi all,
When running the latest Linus' tree, the following possible deadlock warning occurs.
[ 140.949000] ======================================================
[ 140.949000] [ INFO: possible circular locking dependency detected ]
[ 140.949000] 3.15.0-rc7+ #93 Not tainted
[ 140.949000] -------------------------------------------------------
[ 140.949000] qemu-kvm/5056 is trying to acquire lock:
[ 140.949000] (&isec->lock){+.+.+.}, at: [<ffffffff8128c835>] inode_doinit_with_dentry+0xa5/0x640
[ 140.949000]
[ 140.949000] but task is already holding lock:
[ 140.949000] (&mm->mmap_sem){++++++}, at: [<ffffffff81182bcf>] vm_mmap_pgoff+0x6f/0xc0
[ 140.949000]
[ 140.949000] which lock already depends on the new lock.
[ 140.949000]
[ 140.949000]
[ 140.949000] the existing dependency chain (in reverse order) is:
[ 140.949000]
[ 140.949000] -> #2 (&mm->mmap_sem){++++++}:
[ 140.949000] [<ffffffff810c214c>] __lock_acquire+0xadc/0x12f0
[ 140.949000] [<ffffffff810c3152>] lock_acquire+0xa2/0x130
[ 140.949000] [<ffffffff8118dbdc>] might_fault+0x8c/0xb0
[ 140.949000] [<ffffffff811f1371>] filldir+0x91/0x120
[ 140.949000] [<ffffffffa01ff788>] xfs_dir2_block_getdents+0x1e8/0x250 [xfs]
[ 140.949000] [<ffffffffa01ff92a>] xfs_readdir+0xda/0x120 [xfs]
[ 140.949000] [<ffffffffa02017db>] xfs_file_readdir+0x2b/0x40 [xfs]
[ 140.949000] [<ffffffff811f11b8>] iterate_dir+0xa8/0xe0
[ 140.949000] [<ffffffff811f165a>] SyS_getdents+0x8a/0x120
[ 140.949000] [<ffffffff8164b269>] system_call_fastpath+0x16/0x1b
[ 140.949000]
[ 140.949000] -> #1 (&xfs_dir_ilock_class){++++.+}:
[ 140.949000] [<ffffffff810c214c>] __lock_acquire+0xadc/0x12f0
[ 140.949000] [<ffffffff810c3152>] lock_acquire+0xa2/0x130
[ 140.949000] [<ffffffff810bc547>] down_read_nested+0x57/0xa0
[ 140.949000] [<ffffffffa0247602>] xfs_ilock+0xf2/0x120 [xfs]
[ 140.949000] [<ffffffffa02476a4>] xfs_ilock_attr_map_shared+0x34/0x40 [xfs]
[ 140.949000] [<ffffffffa021d229>] xfs_attr_get+0x79/0xb0 [xfs]
[ 140.949000] [<ffffffffa02162f7>] xfs_xattr_get+0x37/0x50 [xfs]
[ 140.949000] [<ffffffff812034cf>] generic_getxattr+0x4f/0x70
[ 140.949000] [<ffffffff8128c8e0>] inode_doinit_with_dentry+0x150/0x640
[ 140.949000] [<ffffffff8128cea8>] sb_finish_set_opts+0xd8/0x270
[ 140.949000] [<ffffffff8128d2cf>] selinux_set_mnt_opts+0x28f/0x5e0
[ 140.949000] [<ffffffff8128d688>] superblock_doinit+0x68/0xd0
[ 140.949000] [<ffffffff8128d700>] delayed_superblock_init+0x10/0x20
[ 140.949000] [<ffffffff811e0a82>] iterate_supers+0xb2/0x110
[ 140.949000] [<ffffffff8128ef33>] selinux_complete_init+0x33/0x40
[ 140.949000] [<ffffffff8129d6b4>] security_load_policy+0xf4/0x600
[ 140.949000] [<ffffffff812908bc>] sel_write_load+0xac/0x750
[ 140.949000] [<ffffffff811dd0ad>] vfs_write+0xbd/0x1f0
[ 140.949000] [<ffffffff811ddc29>] SyS_write+0x49/0xb0
[ 140.949000] [<ffffffff8164b269>] system_call_fastpath+0x16/0x1b
[ 140.949000]
[ 140.949000] -> #0 (&isec->lock){+.+.+.}:
[ 140.949000] [<ffffffff810c0c51>] check_prevs_add+0x951/0x970
[ 140.949000] [<ffffffff810c214c>] __lock_acquire+0xadc/0x12f0
[ 140.949000] [<ffffffff810c3152>] lock_acquire+0xa2/0x130
[ 140.949000] [<ffffffff8163e038>] mutex_lock_nested+0x78/0x4f0
[ 140.949000] [<ffffffff8128c835>] inode_doinit_with_dentry+0xa5/0x640
[ 140.949000] [<ffffffff8128d97c>] selinux_d_instantiate+0x1c/0x20
[ 140.949000] [<ffffffff81283a1b>] security_d_instantiate+0x1b/0x30
[ 140.949000] [<ffffffff811f4fb0>] d_instantiate+0x50/0x70
[ 140.950000] [<ffffffff8117eb10>] __shmem_file_setup+0xe0/0x1d0
[ 140.950000] [<ffffffff81181488>] shmem_zero_setup+0x28/0x70
[ 140.950000] [<ffffffff811999f3>] mmap_region+0x543/0x5a0
[ 140.950000] [<ffffffff81199d51>] do_mmap_pgoff+0x301/0x3d0
[ 140.950000] [<ffffffff81182bf0>] vm_mmap_pgoff+0x90/0xc0
[ 140.950000] [<ffffffff81182c4d>] vm_mmap+0x2d/0x40
[ 140.950000] [<ffffffffa0765177>] kvm_arch_prepare_memory_region+0x47/0x60 [kvm]
[ 140.950000] [<ffffffffa074ed6f>] __kvm_set_memory_region+0x1ff/0x770 [kvm]
[ 140.950000] [<ffffffffa074f30d>] kvm_set_memory_region+0x2d/0x50 [kvm]
[ 140.950000] [<ffffffffa0b2e0da>] vmx_set_tss_addr+0x4a/0x190 [kvm_intel]
[ 140.950000] [<ffffffffa0760bc0>] kvm_arch_vm_ioctl+0x9c0/0xb80 [kvm]
[ 140.950000] [<ffffffffa074f3be>] kvm_vm_ioctl+0x8e/0x730 [kvm]
[ 140.950000] [<ffffffff811f0e50>] do_vfs_ioctl+0x300/0x520
[ 140.950000] [<ffffffff811f10f1>] SyS_ioctl+0x81/0xa0
[ 140.950000] [<ffffffff8164b269>] system_call_fastpath+0x16/0x1b
[ 140.950000]
[ 140.950000] other info that might help us debug this:
[ 140.950000]
[ 140.950000] Chain exists of:
[ 140.950000] &isec->lock --> &xfs_dir_ilock_class --> &mm->mmap_sem
[ 140.950000]
[ 140.950000] Possible unsafe locking scenario:
[ 140.950000]
[ 140.950000] CPU0 CPU1
[ 140.950000] ---- ----
[ 140.950000] lock(&mm->mmap_sem);
[ 140.950000] lock(&xfs_dir_ilock_class);
[ 140.950000] lock(&mm->mmap_sem);
[ 140.950000] lock(&isec->lock);
[ 140.950000]
[ 140.950000] *** DEADLOCK ***
[ 140.950000]
[ 140.950000] 2 locks held by qemu-kvm/5056:
[ 140.950000] #0: (&kvm->slots_lock){+.+.+.}, at: [<ffffffffa074f302>] kvm_set_memory_region+0x22/0x50 [kvm]
[ 140.950000] #1: (&mm->mmap_sem){++++++}, at: [<ffffffff81182bcf>] vm_mmap_pgoff+0x6f/0xc0
[ 140.950000]
[ 140.950000] stack backtrace:
[ 140.950000] CPU: 76 PID: 5056 Comm: qemu-kvm Not tainted 3.15.0-rc7+ #93
[ 140.950000] Hardware name: FUJITSU PRIMEQUEST2800E/SB, BIOS PRIMEQUEST 2000 Series BIOS Version 01.48 05/07/2014
[ 140.950000] ffffffff823925a0 ffff880830ba7750 ffffffff81638c00 ffffffff82321bc0
[ 140.950000] ffff880830ba7790 ffffffff81632d63 ffff880830ba77c0 0000000000000001
[ 140.950000] ffff8808359540d8 ffff8808359540d8 ffff880835953480 0000000000000002
[ 140.950000] Call Trace:
[ 140.950000] [<ffffffff81638c00>] dump_stack+0x4d/0x66
[ 140.950000] [<ffffffff81632d63>] print_circular_bug+0x1f9/0x207
[ 140.950000] [<ffffffff810c0c51>] check_prevs_add+0x951/0x970
[ 140.950000] [<ffffffff810c214c>] __lock_acquire+0xadc/0x12f0
[ 140.950000] [<ffffffff810c3152>] lock_acquire+0xa2/0x130
[ 140.950000] [<ffffffff8128c835>] ? inode_doinit_with_dentry+0xa5/0x640
[ 140.950000] [<ffffffff8163e038>] mutex_lock_nested+0x78/0x4f0
[ 140.950000] [<ffffffff8128c835>] ? inode_doinit_with_dentry+0xa5/0x640
[ 140.950000] [<ffffffff8128c835>] ? inode_doinit_with_dentry+0xa5/0x640
[ 140.950000] [<ffffffff8101cd69>] ? sched_clock+0x9/0x10
[ 140.950000] [<ffffffff810a6545>] ? local_clock+0x25/0x30
[ 140.950000] [<ffffffff8128c835>] inode_doinit_with_dentry+0xa5/0x640
[ 140.950000] [<ffffffff8128d97c>] selinux_d_instantiate+0x1c/0x20
[ 140.950000] [<ffffffff81283a1b>] security_d_instantiate+0x1b/0x30
[ 140.950000] [<ffffffff811f4fb0>] d_instantiate+0x50/0x70
[ 140.950000] [<ffffffff8117eb10>] __shmem_file_setup+0xe0/0x1d0
[ 140.950000] [<ffffffff81181488>] shmem_zero_setup+0x28/0x70
[ 140.950000] [<ffffffff811999f3>] mmap_region+0x543/0x5a0
[ 140.950000] [<ffffffff81199d51>] do_mmap_pgoff+0x301/0x3d0
[ 140.950000] [<ffffffff81182bf0>] vm_mmap_pgoff+0x90/0xc0
[ 140.950000] [<ffffffff81182c4d>] vm_mmap+0x2d/0x40
[ 140.950000] [<ffffffffa0765177>] kvm_arch_prepare_memory_region+0x47/0x60 [kvm]
[ 140.950000] [<ffffffffa074ed6f>] __kvm_set_memory_region+0x1ff/0x770 [kvm]
[ 140.950000] [<ffffffff810c1085>] ? mark_held_locks+0x75/0xa0
[ 140.950000] [<ffffffffa074f30d>] kvm_set_memory_region+0x2d/0x50 [kvm]
[ 140.950000] [<ffffffffa0b2e0da>] vmx_set_tss_addr+0x4a/0x190 [kvm_intel]
[ 140.950000] [<ffffffffa0760bc0>] kvm_arch_vm_ioctl+0x9c0/0xb80 [kvm]
[ 140.950000] [<ffffffff810c1920>] ? __lock_acquire+0x2b0/0x12f0
[ 140.950000] [<ffffffff810c34e8>] ? lock_release_non_nested+0x308/0x350
[ 140.950000] [<ffffffff8101cd69>] ? sched_clock+0x9/0x10
[ 140.950000] [<ffffffff810a6545>] ? local_clock+0x25/0x30
[ 140.950000] [<ffffffff810bde3f>] ? lock_release_holdtime.part.28+0xf/0x190
[ 140.950000] [<ffffffffa074f3be>] kvm_vm_ioctl+0x8e/0x730 [kvm]
[ 140.950000] [<ffffffff811f0e50>] do_vfs_ioctl+0x300/0x520
[ 140.950000] [<ffffffff81287e86>] ? file_has_perm+0x86/0xa0
[ 140.950000] [<ffffffff811f10f1>] SyS_ioctl+0x81/0xa0
[ 140.950000] [<ffffffff8111383c>] ? __audit_syscall_entry+0x9c/0xf0
[ 140.950000] [<ffffffff8164b269>] system_call_fastpath+0x16/0x1b
Thanks,
Gu
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