Re: perf: perf_fuzzer quickly locks up on 4.15-rc7
From: Vince Weaver
Date: Thu Jan 11 2018 - 13:20:20 EST
On Thu, 11 Jan 2018, Vince Weaver wrote:
> on the same core2 machine I got this which didn't crash the machine (but
> the perf_fuzzer process is stuck)
also got this one:
Cannot open /sys/kernel/tracing/kprobe_events
[ 408.159243] watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [perf_fuzzer:22326]
[ 408.193102] CPU: 1 PID: 22326 Comm: perf_fuzzer Tainted: G D 4.15.0-rc7+ #211
[ 408.201507] Hardware name: AOpen DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015 10/19/2012
[ 408.210436] RIP: 0010:smp_call_function_single+0xac/0xc3
[ 408.215797] RSP: 0018:ffffc90008307de0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff11
[ 408.223421] RAX: 0000000000000000 RBX: ffffc90008307de0 RCX: 0000000000000000
[ 408.230602] RDX: 0000000000000001 RSI: 00000000000008fb RDI: 0000000000000300
[ 408.237777] RBP: ffffc90008307e30 R08: fffffffc3146e801 R09: 0000000000000003
[ 408.244957] R10: 0000000000000000 R11: ffff88011a98af80 R12: 0000000000000001
[ 408.252137] R13: 0000000000000000 R14: 00007f05bdefb104 R15: 000000000000001f
[ 408.259318] FS: 00007f05be10d700(0000) GS:ffff88011fc80000(0000) knlGS:0000000000000000
[ 408.267462] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 408.273258] CR2: 0000000000735980 CR3: 000000011a31a000 CR4: 00000000000407e0
[ 408.280439] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 408.287620] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[ 408.294798] Call Trace:
[ 408.297300] ? perf_event_sysfs_show+0x1d/0x1d
[ 408.301792] ? ctx_resched+0x84/0x84
[ 408.305418] ? task_function_call+0x35/0x48
[ 408.309649] task_function_call+0x35/0x48
[ 408.313706] ? perf_ctx_lock+0x1e/0x1e
[ 408.317506] event_function_call+0x60/0xa5
[ 408.321652] ? ctx_resched+0x84/0x84
[ 408.325278] ? _perf_event_disable+0x3e/0x3e
[ 408.329598] perf_event_for_each_child+0x4d/0x6b
[ 408.334267] perf_event_task_enable+0x66/0x9a
[ 408.338673] SyS_prctl+0x152/0x3ca
[ 408.342126] ? SyS_write+0x69/0x78
[ 408.345581] entry_SYSCALL_64_fastpath+0x17/0x70
[ 408.350248] RIP: 0033:0x7f05bdc3ee7a
[ 408.353872] RSP: 002b:00007ffc80e425c8 EFLAGS: 00000202
[ 408.353874] Code: 01 74 04 f3 90 eb f4 83 48 18 01 48 89 d1 44 89 d7 48 89 f2 48 89 de e8 c9 fe ff ff 45 85 e4 74 12 8b 53 18 80 e2 01 74 04 f3 90 <eb> f4 eb 04 0f ff eb ad 48 83 c4 38 5b 41 5a 41 5c 5d 49 8d 62