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====================================================== [ INFO: possible circular locking dependency detected ] 3.2.7-1.fc16.x86_64.debug #1 ------------------------------------------------------- yumBackend.py/1705 is trying to acquire lock: (&sb->s_type->i_mutex_key#12){+.+.+.}, at: [<ffffffffa01a649b>] btrfs_page_mkwrite+0x5b/0x310 [btrfs] but task is already holding lock: (&mm->mmap_sem){++++++}, at: [<ffffffff8167839a>] do_page_fault+0xea/0x590 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&mm->mmap_sem){++++++}: [<ffffffff810be5dd>] lock_acquire+0x9d/0x1f0 [<ffffffff81167ad9>] might_fault+0x89/0xb0 [<ffffffff811c11e7>] filldir+0x77/0xe0 [<ffffffffa019cd0f>] btrfs_real_readdir+0xbf/0x740 [btrfs] [<ffffffff811c14b8>] vfs_readdir+0xb8/0xf0 [<ffffffff811c15e9>] sys_getdents+0x89/0x100 [<ffffffff8167d082>] system_call_fastpath+0x16/0x1b -> #0 (&sb->s_type->i_mutex_key#12){+.+.+.}: [<ffffffff810bd95e>] __lock_acquire+0x16ee/0x1c60 [<ffffffff810be5dd>] lock_acquire+0x9d/0x1f0 [<ffffffff816718c4>] mutex_lock_nested+0x74/0x3a0 [<ffffffffa01a649b>] btrfs_page_mkwrite+0x5b/0x310 [btrfs] [<ffffffff8116806e>] __do_fault+0xee/0x4f0 [<ffffffff8116ab80>] handle_pte_fault+0x90/0xa10 [<ffffffff8116b8a8>] handle_mm_fault+0x1e8/0x2f0 [<ffffffff81678420>] do_page_fault+0x170/0x590 [<ffffffff81674d75>] page_fault+0x25/0x30 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_sem); lock(&sb->s_type->i_mutex_key); lock(&mm->mmap_sem); lock(&sb->s_type->i_mutex_key); *** DEADLOCK *** 1 lock held by yumBackend.py/1705: #0: (&mm->mmap_sem){++++++}, at: [<ffffffff8167839a>] do_page_fault+0xea/0x590 stack backtrace: Pid: 1705, comm: yumBackend.py Not tainted 3.2.7-1.fc16.x86_64.debug #1 Call Trace: [<ffffffff81667854>] print_circular_bug+0x202/0x213 [<ffffffff810bd95e>] __lock_acquire+0x16ee/0x1c60 [<ffffffff810aac68>] ? sched_clock_cpu+0xa8/0x110 [<ffffffff810bc6ae>] ? __lock_acquire+0x43e/0x1c60 [<ffffffff810be5dd>] lock_acquire+0x9d/0x1f0 [<ffffffffa01a649b>] ? btrfs_page_mkwrite+0x5b/0x310 [btrfs] [<ffffffffa01a649b>] ? btrfs_page_mkwrite+0x5b/0x310 [btrfs] [<ffffffff816718c4>] mutex_lock_nested+0x74/0x3a0 [<ffffffffa01a649b>] ? btrfs_page_mkwrite+0x5b/0x310 [btrfs] [<ffffffffa01a649b>] btrfs_page_mkwrite+0x5b/0x310 [btrfs] [<ffffffff811456d4>] ? filemap_fault+0x104/0x4d0 [<ffffffff8116806e>] __do_fault+0xee/0x4f0 [<ffffffff8116ab80>] handle_pte_fault+0x90/0xa10 [<ffffffff810b92f5>] ? lock_release_holdtime.part.9+0x15/0x1a0 [<ffffffff811a0c95>] ? mem_cgroup_count_vm_event+0x95/0x140 [<ffffffff8116b8a8>] handle_mm_fault+0x1e8/0x2f0 [<ffffffff81678420>] do_page_fault+0x170/0x590 [<ffffffff810b8a5d>] ? trace_hardirqs_off+0xd/0x10 [<ffffffff810aad3f>] ? local_clock+0x6f/0x80 [<ffffffff810b92f5>] ? lock_release_holdtime.part.9+0x15/0x1a0 [<ffffffff811aaa35>] ? sys_close+0xb5/0x1a0 [<ffffffff81314dad>] ? trace_hardirqs_off_thunk+0x3a/0x3c [<ffffffff81674d75>] page_fault+0x25/0x30
This is fixed upstream, we need f248679e86fead40cc78e724c7181d6bec1a2046, I thought it had been sent back to -stable, I'll double check on that.
[mass update] kernel-3.3.0-4.fc16 has been pushed to the Fedora 16 stable repository. Please retest with this update.