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SubjectPossible circular locking dependency detected in Reiser4
Date
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Hello,

I got the following warning when I ran klive:

Andrew Wade

=======================================================
[ INFO: possible circular locking dependency detected ]
-------------------------------------------------------
twistd/3816 is trying to acquire lock:
(&txnh->hlock){--..}, at: [txn_end+1011/1139] txn_end+0x3f3/0x473

but task is already holding lock:
(&atom->alock){--..}, at: [txnh_get_atom+28/120] txnh_get_atom+0x1c/0x78

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&atom->alock){--..}:
[lock_acquire+94/129] lock_acquire+0x5e/0x81
[_spin_lock+35/50] _spin_lock+0x23/0x32
[try_capture+733/2499] try_capture+0x2dd/0x9c3
[longterm_lock_znode+755/1026] longterm_lock_znode+0x2f3/0x402
[seal_validate+82/288] seal_validate+0x52/0x120
[write_sd_by_inode_common+659/1328] write_sd_by_inode_common+0x293/0x530
[reiser4_update_sd+37/44] reiser4_update_sd+0x25/0x2c
[reiser4_dirty_inode+23/112] reiser4_dirty_inode+0x17/0x70
[__mark_inode_dirty+41/353] __mark_inode_dirty+0x29/0x161
[inode_setattr+345/355] inode_setattr+0x159/0x163
[setattr_common+86/131] setattr_common+0x56/0x83
[setattr_unix_file+493/507] setattr_unix_file+0x1ed/0x1fb
[notify_change+260/533] notify_change+0x104/0x215
[sys_fchmodat+151/190] sys_fchmodat+0x97/0xbe
[sys_chmod+18/20] sys_chmod+0x12/0x14
[sysenter_past_esp+86/141] sysenter_past_esp+0x56/0x8d

-> #0 (&txnh->hlock){--..}:
[lock_acquire+94/129] lock_acquire+0x5e/0x81
[_spin_lock+35/50] _spin_lock+0x23/0x32
[txn_end+1011/1139] txn_end+0x3f3/0x473
[reiser4_exit_context+172/287] reiser4_exit_context+0xac/0x11f
[setattr_common+123/131] setattr_common+0x7b/0x83
[setattr_unix_file+493/507] setattr_unix_file+0x1ed/0x1fb
[notify_change+260/533] notify_change+0x104/0x215
[sys_fchmodat+151/190] sys_fchmodat+0x97/0xbe
[sys_chmod+18/20] sys_chmod+0x12/0x14
[sysenter_past_esp+86/141] sysenter_past_esp+0x56/0x8d

other info that might help us debug this:

2 locks held by twistd/3816:
#0: (&inode->i_mutex){--..}, at: [mutex_lock+8/10] mutex_lock+0x8/0xa
#1: (&atom->alock){--..}, at: [txnh_get_atom+28/120] txnh_get_atom+0x1c/0x78

stack backtrace:
[show_trace_log_lvl+84/253] show_trace_log_lvl+0x54/0xfd
[show_trace+13/16] show_trace+0xd/0x10
[dump_stack+23/25] dump_stack+0x17/0x19
[print_circular_bug_tail+89/100] print_circular_bug_tail+0x59/0x64
[__lock_acquire+2084/2524] __lock_acquire+0x824/0x9dc
[lock_acquire+94/129] lock_acquire+0x5e/0x81
[_spin_lock+35/50] _spin_lock+0x23/0x32
[txn_end+1011/1139] txn_end+0x3f3/0x473
[reiser4_exit_context+172/287] reiser4_exit_context+0xac/0x11f
[setattr_common+123/131] setattr_common+0x7b/0x83
[setattr_unix_file+493/507] setattr_unix_file+0x1ed/0x1fb
[notify_change+260/533] notify_change+0x104/0x215
[sys_fchmodat+151/190] sys_fchmodat+0x97/0xbe
[sys_chmod+18/20] sys_chmod+0x12/0x14
[sysenter_past_esp+86/141] sysenter_past_esp+0x56/0x8d
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