Hi, on deleting a directory with quite a lot of files we get a soft lockup, but the stack trace does look rather strange. Somehow I think this looks more like a timer/hardware bug than like a lustre bug, doesn''t it? Unfortunately I can''t test with another clocksource, only jiffies are supported. Any ideas? [ 2693.454376] Call Trace: [ 2693.458538] [<ffffffff8020b40b>] dump_trace+0xeb/0x471 [ 2693.463971] [<ffffffff8020b83d>] show_trace+0x49/0x68 [ 2693.469288] [<ffffffff8020b877>] dump_stack+0x1b/0x1d [ 2693.474579] [<ffffffff8025fcb8>] softlockup_tick+0x102/0x118 [ 2693.480563] [<ffffffff8023a569>] run_local_timers+0x13/0x15 [ 2693.486399] [<ffffffff8023a5be>] update_process_times+0x53/0x85 [ 2693.492630] [<ffffffff80216af5>] smp_local_timer_interrupt+0x36/0x56 [ 2693.499306] [<ffffffff80216b7f>] smp_apic_timer_interrupt+0x6a/0x87 [ 2693.505860] [<ffffffff8020abab>] apic_timer_interrupt+0x6b/0x70 [ 2693.512120] [<ffffffff8812f172>] :libcfs:cfs_alloc_flags_to_gfp+0x2/0x40 [ 2693.519210] [<ffffffff8812f1d1>] :libcfs:cfs_alloc+0x21/0x60 [ 2693.525254] [<ffffffff88164f47>] :lnet:LNetMEAttach+0xe7/0x300 [ 2693.531437] [<ffffffff8821e4c3>] :ptlrpc:ptl_send_rpc+0x5d3/0xd90 [ 2693.537909] [<ffffffff882135bb>] :ptlrpc:ptlrpc_send_new_req+0x3fb/0x540 [ 2693.545017] [<ffffffff88216674>] :ptlrpc:ptlrpc_check_set+0x134/0xaf0 [ 2693.551897] [<ffffffff8823b74f>] :ptlrpc:ptlrpcd_check+0x18f/0x2b0 [ 2693.560350] [<ffffffff8823b9f5>] :ptlrpc:ptlrpcd+0x185/0x4a0 [ 2693.566351] [<ffffffff8020ad88>] child_rip+0xa/0x12 [ 2693.571515] [ 2703.572278] BUG: soft lockup detected on CPU#0! [ 2703.577042] [ 2703.577043] Call Trace: [ 2703.581162] [<ffffffff8020b40b>] dump_trace+0xeb/0x471 [ 2703.586629] [<ffffffff8020b83d>] show_trace+0x49/0x68 [ 2703.592036] [<ffffffff8020b877>] dump_stack+0x1b/0x1d [ 2703.597347] [<ffffffff8025fcb8>] softlockup_tick+0x102/0x118 [ 2703.603323] [<ffffffff8023a569>] run_local_timers+0x13/0x15 [ 2703.609240] [<ffffffff8023a5be>] update_process_times+0x53/0x85 [ 2703.615444] [<ffffffff80216af5>] smp_local_timer_interrupt+0x36/0x56 [ 2703.622076] [<ffffffff80216b7f>] smp_apic_timer_interrupt+0x6a/0x87 [ 2703.628685] [<ffffffff8020abab>] apic_timer_interrupt+0x6b/0x70 [ 2703.634905] [<ffffffff8036799d>] vsnprintf+0xa1/0x64f [ 2703.640282] [<ffffffff8813511d>] :libcfs:libcfs_debug_vmsg2+0x4fd/0x990 [ 2703.647206] [<ffffffff882131a5>] :ptlrpc:ptlrpc_import_delay_req+0x215/0x230 [ 2703.654491] [<ffffffff88216963>] :ptlrpc:ptlrpc_check_set+0x423/0xaf0 [ 2703.661177] [<ffffffff8823b74f>] :ptlrpc:ptlrpcd_check+0x18f/0x2b0 [ 2703.667610] [<ffffffff8823b9f5>] :ptlrpc:ptlrpcd+0x185/0x4a0 [ 2703.673486] [<ffffffff8020ad88>] child_rip+0xa/0x12 [ 2703.678578] This is with lustre-1.4.11. Thanks, Bernd -- Bernd Schubert Q-Leap Networks GmbH