Red Hat Bugzilla – Bug 201810
lockdep: circular locking dependency detected from beagled (dev->ev_mutex)
Last modified: 2014-08-11 01:40:18 EDT
Description of problem: with kernel-2.6.17-1.2530.fc6 Aug 8 12:20:09 static kernel: ======================================================= Aug 8 12:20:09 static kernel: [ INFO: possible circular locking dependency detected ] Aug 8 12:20:09 static kernel: ------------------------------------------------------- Aug 8 12:20:09 static kernel: beagled/3343 is trying to acquire lock: Aug 8 12:20:09 static kernel: (&mm->mmap_sem){----}, at: [<c0610735>] do_page_fault+0x174/0x4a4 Aug 8 12:20:09 static kernel: Aug 8 12:20:09 static kernel: but task is already holding lock: Aug 8 12:20:09 static kernel: (&dev->ev_mutex){--..}, at: [<c060e3b0>] mutex_lock+0x21/0x24 Aug 8 12:20:09 static kernel: Aug 8 12:20:09 static kernel: which lock already depends on the new lock. Aug 8 12:20:09 static kernel: Aug 8 12:20:09 static kernel: Aug 8 12:20:09 static kernel: the existing dependency chain (in reverse order) is: Aug 8 12:20:09 static kernel: Aug 8 12:20:09 static kernel: -> #3 (&dev->ev_mutex){--..}: Aug 8 12:20:09 static kernel: [<c043bfc5>] lock_acquire+0x4b/0x6a Aug 8 12:20:09 static kernel: [<c060e241>] __mutex_lock_slowpath+0xbc/0x20a Aug 8 12:20:09 static kernel: [<c060e3b0>] mutex_lock+0x21/0x24 Aug 8 12:20:09 static kernel: [<c0497312>] inotify_dev_queue_event+0x1f/0x108 Aug 8 12:20:09 static kernel: [<c049692b>] inotify_remove_watch_locked+0x27/0x31 Aug 8 12:20:09 static kernel: [<c0496bc6>] inotify_rm_wd+0x75/0x93 Aug 8 12:20:09 static kernel: [<c0496ffe>] sys_inotify_rm_watch+0x40/0x58 Aug 8 12:20:09 static kernel: [<c0403faf>] syscall_call+0x7/0xb Aug 8 12:20:09 static kernel: Aug 8 12:20:09 static kernel: -> #2 (&ih->mutex){--..}: Aug 8 12:20:09 static kernel: [<c043bfc5>] lock_acquire+0x4b/0x6a Aug 8 12:20:09 static kernel: [<c060e241>] __mutex_lock_slowpath+0xbc/0x20a Aug 8 12:20:09 static kernel: [<c060e3b0>] mutex_lock+0x21/0x24 Aug 8 12:20:09 static kernel: [<c04965c8>] inotify_find_update_watch+0x42/0x83 Aug 8 12:20:09 static kernel: [<c049763e>] sys_inotify_add_watch+0xb0/0x14e Aug 8 12:20:09 static kernel: [<c0403faf>] syscall_call+0x7/0xb Aug 8 12:20:09 static kernel: Aug 8 12:20:09 static kernel: -> #1 (&inode->inotify_mutex){--..}: Aug 8 12:20:09 static kernel: [<c043bfc5>] lock_acquire+0x4b/0x6a Aug 8 12:20:09 static kernel: [<c060e241>] __mutex_lock_slowpath+0xbc/0x20a Aug 8 12:20:09 static kernel: [<c060e3b0>] mutex_lock+0x21/0x24 Aug 8 12:20:09 static kernel: [<c049688f>] inotify_inode_queue_event+0x32/0xa7 Aug 8 12:20:09 static kernel: [<c0496d44>] inotify_dentry_parent_queue_event+0x69/0x83 Aug 8 12:20:09 static kernel: [<c0473b4d>] __fput+0x70/0x17b Aug 8 12:20:09 static kernel: [<c0473c6f>] fput+0x17/0x19 Aug 8 12:20:09 static kernel: [<c0463515>] remove_vma+0x3c/0x4e Aug 8 12:20:09 static kernel: [<c0463e5a>] do_munmap+0x18c/0x1a6 Aug 8 12:20:09 static kernel: [<c0463ea7>] sys_munmap+0x33/0x42 Aug 8 12:20:09 static kernel: [<c0403faf>] syscall_call+0x7/0xb Aug 8 12:20:09 static kernel: Aug 8 12:20:09 static kernel: -> #0 (&mm->mmap_sem){----}: Aug 8 12:20:09 static kernel: [<c043bfc5>] lock_acquire+0x4b/0x6a Aug 8 12:20:09 static kernel: [<c043901c>] down_read+0x2d/0x40 Aug 8 12:20:09 static kernel: [<c0610735>] do_page_fault+0x174/0x4a4 Aug 8 12:20:09 static kernel: [<c0404be1>] error_code+0x39/0x40 Aug 8 12:20:09 static kernel: [<c04eaffb>] copy_to_user+0x4e/0x57 Aug 8 12:20:09 static kernel: [<c049728c>] inotify_read+0xf5/0x15c Aug 8 12:20:09 static kernel: [<c047334c>] vfs_read+0xa9/0x155 Aug 8 12:20:09 static kernel: [<c04737dc>] sys_read+0x3b/0x60 Aug 8 12:20:09 static kernel: [<c0403faf>] syscall_call+0x7/0xb Aug 8 12:20:09 static kernel: Aug 8 12:20:09 static kernel: other info that might help us debug this: Aug 8 12:20:09 static kernel: Aug 8 12:20:09 static kernel: 1 lock held by beagled/3343: Aug 8 12:20:09 static kernel: #0: (&dev->ev_mutex){--..}, at: [<c060e3b0>] mutex_lock+0x21/0x24 Aug 8 12:20:09 static kernel: Aug 8 12:20:09 static kernel: stack backtrace: Aug 8 12:20:09 static kernel: [<c04051ee>] show_trace_log_lvl+0x58/0x159 Aug 8 12:20:09 static kernel: [<c04057ea>] show_trace+0xd/0x10 Aug 8 12:20:09 static kernel: [<c0405903>] dump_stack+0x19/0x1b Aug 8 12:20:09 static kernel: [<c043b0b2>] print_circular_bug_tail+0x59/0x64 Aug 8 12:20:09 static kernel: [<c043b8c5>] __lock_acquire+0x808/0x997 Aug 8 12:20:09 static kernel: [<c043bfc5>] lock_acquire+0x4b/0x6a Aug 8 12:20:09 static kernel: [<c043901c>] down_read+0x2d/0x40 Aug 8 12:20:09 static kernel: [<c0610735>] do_page_fault+0x174/0x4a4 Aug 8 12:20:09 static kernel: [<c0404be1>] error_code+0x39/0x40 Aug 8 12:20:09 static kernel: DWARF2 unwinder stuck at error_code+0x39/0x40 Aug 8 12:20:09 static kernel: Leftover inexact backtrace: Aug 8 12:20:09 static kernel: [<c04057ea>] show_trace+0xd/0x10 Aug 8 12:20:09 static kernel: [<c0405903>] dump_stack+0x19/0x1b Aug 8 12:20:09 static kernel: [<c043b0b2>] print_circular_bug_tail+0x59/0x64 Aug 8 12:20:09 static kernel: [<c043b8c5>] __lock_acquire+0x808/0x997 Aug 8 12:20:09 static kernel: [<c043bfc5>] lock_acquire+0x4b/0x6a Aug 8 12:20:09 static kernel: [<c043901c>] down_read+0x2d/0x40 Aug 8 12:20:09 static kernel: [<c0610735>] do_page_fault+0x174/0x4a4 Aug 8 12:20:09 static kernel: [<c0404be1>] error_code+0x39/0x40 Aug 8 12:20:09 static kernel: [<c04eaffb>] copy_to_user+0x4e/0x57 Aug 8 12:20:09 static kernel: [<c049728c>] inotify_read+0xf5/0x15c Aug 8 12:20:09 static kernel: [<c047334c>] vfs_read+0xa9/0x155 Aug 8 12:20:09 static kernel: [<c04737dc>] sys_read+0x3b/0x60 Aug 8 12:20:09 static kernel: [<c0403faf>] syscall_call+0x7/0xb
Kenneth, can you still reproduce this warning? I'm a bit stumped by this trace, and am wondering if the latest kernel 1) still triggers it, and 2) gives the exact same trace.
No, issue went away with more recent kernels.