linux-kernel - new warning here with kernel 4.15.1: kernel/signal.c:2101 get

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Date:   Mon, 5 Feb 2018 19:15:11 +0100
From:   Toralf Förster <toralf.foerster@....de>
To:     Linux Kernel <linux-kernel@...r.kernel.org>
Subject: new warning here with kernel 4.15.1: kernel/signal.c:2101
 get_signal+0x48c/0x4c0

Got this at a stable Gentoo hardened Linux server today and do wonder how to react on it:


Feb  5 17:33:41 mr-fox kernel: [102822.981295] capability: warning: `capget-54cLBXW7' uses 32-bit capabilities (legacy support in use)
Feb  5 17:33:50 mr-fox kernel: [102831.276626] perf: interrupt took too long (2507 > 2500), lowering kernel.perf_event_max_sample_rate to 79000
Feb  5 17:34:53 mr-fox kernel: [102894.649207] WARNING: CPU: 1 PID: 13199 at kernel/signal.c:2101 get_signal+0x48c/0x4c0
Feb  5 17:34:53 mr-fox kernel: [102894.649209] CPU: 1 PID: 13199 Comm: constructor-O92 Not tainted 4.15.1 #20
Feb  5 17:34:53 mr-fox kernel: [102894.649210] Hardware name:                  /DX79TO, BIOS SIX7910J.86A.0650.2014.0307.0138 03/07/2014
Feb  5 17:34:53 mr-fox kernel: [102894.649211] RIP: 0010:get_signal+0x48c/0x4c0
Feb  5 17:34:53 mr-fox kernel: [102894.649212] RSP: 0018:ffffa1ad93b33db0 EFLAGS: 00010046
Feb  5 17:34:53 mr-fox kernel: [102894.649213] RAX: ffff8ff60163e1c0 RBX: ffff8ff0dcb86800 RCX: 0000000000000000
Feb  5 17:34:53 mr-fox kernel: [102894.649214] RDX: 0000000000000001 RSI: 0000000000010106 RDI: 0000000000000000
Feb  5 17:34:53 mr-fox kernel: [102894.649214] RBP: ffff8ff5fcb83180 R08: 0000000000000000 R09: 000000000001e700
Feb  5 17:34:53 mr-fox kernel: [102894.649215] R10: ffffa1ad93b33f08 R11: 0000000000000000 R12: ffff8ff0dcb86800
Feb  5 17:34:53 mr-fox kernel: [102894.649215] R13: ffff8ff0dcb86800 R14: ffff8ff60163e1c0 R15: ffffa1ad93b33e30
Feb  5 17:34:53 mr-fox kernel: [102894.649216] FS:  00007f6a982c3700(0000) GS:ffff8ff67fa40000(0000) knlGS:0000000000000000
Feb  5 17:34:53 mr-fox kernel: [102894.649217] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Feb  5 17:34:53 mr-fox kernel: [102894.649218] CR2: 00007f6a982c2fb8 CR3: 00000005ed1d0001 CR4: 00000000000606e4
Feb  5 17:34:53 mr-fox kernel: [102894.649218] DR0: 00005555557560c0 DR1: 00005555557560c4 DR2: 00005555557560c8
Feb  5 17:34:53 mr-fox kernel: [102894.649219] DR3: 00005555557560cc DR6: 00000000ffff0ff0 DR7: 0000000000000600
Feb  5 17:34:53 mr-fox kernel: [102894.649219] Call Trace:
Feb  5 17:34:53 mr-fox kernel: [102894.649223]  do_signal+0x3e/0x5d0
Feb  5 17:34:53 mr-fox kernel: [102894.649225]  ? pick_next_task_fair+0x453/0x480
Feb  5 17:34:53 mr-fox kernel: [102894.649227]  ? radix_tree_delete_item+0x56/0xb0
Feb  5 17:34:53 mr-fox kernel: [102894.649229]  exit_to_usermode_loop+0x49/0x80
Feb  5 17:34:53 mr-fox kernel: [102894.649230]  syscall_return_slowpath+0x7b/0xa0
Feb  5 17:34:53 mr-fox kernel: [102894.649232]  ret_from_fork+0x15/0x40
Feb  5 17:34:53 mr-fox kernel: [102894.649233] RIP: 0033:0x7f6a985ca4a1
Feb  5 17:34:53 mr-fox kernel: [102894.649233] RSP: 002b:00007f6a982c2fb0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
Feb  5 17:34:53 mr-fox kernel: [102894.649234] RAX: 0000000000000000 RBX: 00007f6a982c3700 RCX: ffffffffffffffff
Feb  5 17:34:53 mr-fox kernel: [102894.649235] RDX: 00007f6a982c39d0 RSI: 00007f6a982c2fb0 RDI: 00000000003d0f00
Feb  5 17:34:53 mr-fox kernel: [102894.649236] RBP: 00007ffea7a38da0 R08: 00007f6a982c3700 R09: 00007f6a982c3700
Feb  5 17:34:53 mr-fox kernel: [102894.649236] R10: 00007f6a982c39d0 R11: 0000000000000246 R12: 00007ffea7a38d9e
Feb  5 17:34:53 mr-fox kernel: [102894.649237] R13: 00007ffea7a38d9f R14: 00007f6a982c3700 R15: 0000000000000000
Feb  5 17:34:53 mr-fox kernel: [102894.649237] Code: 49 89 57 10 48 8b 50 20 49 89 57 18 f6 40 13 80 74 08 48 c7 40 08 00 00 00 00 31 c0 45 85 c0 0f 9f c0 eb a0 0f ff e9 93 fe ff ff <0f> ff be 00 80 00 00 e9 a0 fd ff ff e8 83 ba 00 00 e9 94 fb ff 
Feb  5 17:34:53 mr-fox kernel: [102894.649254] ---[ end trace 75e71e5311ec023f ]---
Feb  5 17:52:16 mr-fox kernel: [103937.607726] perf: interrupt took too long (3134 > 3133), lowering kernel.perf_event_max_sample_rate to 63000
Feb  5 17:52:17 mr-fox kernel: [103938.353509] perf: interrupt took too long (3963 > 3917), lowering kernel.perf_event_max_sample_rate to 50000


-- 
Toralf
PGP C4EACDDE 0076E94E