Messages in this thread |  | | | Subject | sysfs lockdep complaint | | From | Johannes Berg <> | | Date | Thu, 18 Feb 2010 10:32:23 +0100 |
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Get this when powernowd starts on my G5:
[ 30.490674] ============================================= [ 30.490708] [ INFO: possible recursive locking detected ] [ 30.490727] 2.6.33-rc8-wl-64012-g6917413 #160 [ 30.490744] --------------------------------------------- [ 30.490763] powernowd/2577 is trying to acquire lock: [ 30.490782] (s_active){++++.+}, at: [<c0000000001efa94>] .sysfs_addrm_finish+0x58/0xc0 [ 30.490831] [ 30.490833] but task is already holding lock: [ 30.490854] (s_active){++++.+}, at: [<c0000000001eff80>] .sysfs_get_active_two+0x3c/0x84 [ 30.490895] [ 30.490896] other info that might help us debug this: [ 30.490921] 4 locks held by powernowd/2577: [ 30.490936] #0: (&buffer->mutex){+.+.+.}, at: [<c0000000001ed8d0>] .sysfs_write_file+0x60/0x1a4 [ 30.490983] #1: (s_active){++++.+}, at: [<c0000000001eff80>] .sysfs_get_active_two+0x3c/0x84 [ 30.491028] #2: (s_active){++++.+}, at: [<c0000000001eff98>] .sysfs_get_active_two+0x54/0x84 [ 30.491073] #3: (dbs_mutex){+.+.+.}, at: [<d000000002c9c6e8>] .cpufreq_governor_dbs+0x424/0x548 [cpufreq_ondemand] [ 30.491128] [ 30.491130] stack backtrace: [ 30.491148] Call Trace: [ 30.491166] [c00000021251af10] [c000000000012934] .show_stack+0xc0/0x200 (unreliable) [ 30.491205] [c00000021251afe0] [c0000000005a74b0] .dump_stack+0x28/0x3c [ 30.491234] [c00000021251b060] [c0000000000b88c8] .validate_chain+0x758/0x1044 [ 30.491265] [c00000021251b1a0] [c0000000000b9b94] .__lock_acquire+0x9e0/0xac4 [ 30.491294] [c00000021251b2d0] [c0000000000b9dc8] .lock_acquire+0x150/0x19c [ 30.491324] [c00000021251b3a0] [c0000000001eeeb8] .sysfs_deactivate+0xd0/0x16c [ 30.491354] [c00000021251b4f0] [c0000000001efa94] .sysfs_addrm_finish+0x58/0xc0 [ 30.491385] [c00000021251b590] [c0000000001ecb98] .sysfs_hash_and_remove+0x7c/0xb0 [ 30.491416] [c00000021251b640] [c0000000001f1710] .sysfs_remove_group+0xb4/0x138 [ 30.491450] [c00000021251b6e0] [d000000002c9c6f8] .cpufreq_governor_dbs+0x434/0x548 [cpufreq_ondemand] [ 30.491487] [c00000021251b7e0] [c0000000004cc3e4] .__cpufreq_governor+0x1cc/0x250 [ 30.491520] [c00000021251b890] [c0000000004cdb90] .__cpufreq_set_policy+0x1f8/0x2a8 [ 30.491552] [c00000021251b940] [c0000000004ce1a0] .store_scaling_governor+0x1c0/0x21c [ 30.491584] [c00000021251bb50] [c0000000004cd954] .store+0x98/0xdc [ 30.491611] [c00000021251bc00] [c0000000001ed9a4] .sysfs_write_file+0x134/0x1a4 [ 30.491644] [c00000021251bcc0] [c000000000176ca0] .vfs_write+0xe8/0x1fc [ 30.491672] [c00000021251bd70] [c000000000176ef0] .SyS_write+0x68/0xb0 [ 30.491700] [c00000021251be30] [c0000000000075d4] syscall_exit+0x0/0x40
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