>
> Caught while browsing with chromium shortly after boot.
> Haven't seen something like that before.
>
Maybe the POLLFREE race still in mainline, mind trying the untested diff?
--- linux-3.16.1-org/fs/eventpoll.c Thu Aug 14 10:36:35 2014
+++ linux-3.16.1/fs/eventpoll.c Tue Dec 30 19:59:06 2014
@@ -520,7 +520,7 @@ static void ep_remove_wait_queue(struct
rcu_read_lock();
/* If it is cleared by POLLFREE, it should be rcu-safe */
whead = rcu_dereference(pwq->whead);
- if (whead)
+ if (whead && !list_empty(&pwq->wait.task_list))
remove_wait_queue(whead, &pwq->wait);
rcu_read_unlock();
}
--
> Several chromium tabs locked up, dmesg was full of
> similar messages. Box was more or less operational,
> then switched to text console with last panic message.
>
> After reboot, that's all what was left:
>
> [] ep_remove+0x1d/0xb0
> [] SyS_epoll_ctl+0x400/0xae0
> [] ? local_clock+0x1b/0x30
> [] ? syscall_trace_enter+0x16b/0x180
> [] tracesys+0xd0/0xd5
> ---[ end trace 3fc03b0916c7ab8d ]---
> [ cut here ]
> WARNING: CPU: 0 PID: 1384 at lib/list_debug.c:53 __list_del_entry+0x63/0xd0()
> list_del corruption, 8800d99a7858->next is LIST_POISON1 (dead00100100)
> Modules linked in: usbhid uhci_hcd
> CPU: 0 PID: 1384 Comm: Chrome_IOThread Tainted: GW 3.17.7 #51
> Hardware name: Hewlett-Packard HP Compaq dc7800 Convertible
> Minitower/0AACh, BIOS 786F1 v01.28 02/26/2009
> 0009 8800c6387d70 8147f3c3 8800c6387db8
> 8800c6387da8 810761f3 8800d99a7858 8800d99a7840
> 0286 00fa fffe 8800c6387e08
> Call Trace:
> [] dump_stack+0x4d/0x6f
> [] warn_slowpath_common+0x73/0x90
> [] warn_slowpath_fmt+0x47/0x50
> [] ? warn_slowpath_fmt+0x47/0x50
> [] __list_del_entry+0x63/0xd0
> [] list_del+0xd/0x30
> [] remove_wait_queue+0x21/0x40
> [] ep_unregister_pollwait.isra.17+0x3f/0x70
> [] ep_remove+0x1d/0xb0
> [] SyS_epoll_ctl+0x400/0xae0
> [] ? local_clock+0x1b/0x30
> [] ? syscall_trace_enter+0x16b/0x180
> [] tracesys+0xd0/0xd5
> ---[ end trace 3fc03b0916c7ab8e ]---
> [ cut here ]
> WARNING: CPU: 0 PID: 1384 at lib/list_debug.c:56 __list_del_entry+0xc3/0xd0()
> list_del corruption, 8800d99a7828->prev is LIST_POISON2 (dead00200200)
> Modules linked in: usbhid uhci_hcd
> CPU: 0 PID: 1384 Comm: Chrome_IOThread Tainted: GW 3.17.7 #51
> Hardware name: Hewlett-Packard HP Compaq dc7800 Convertible
> Minitower/0AACh, BIOS 786F1 v01.28 02/26/2009
> 0009 8800c6387d98 8147f3c3 8800c6387de0
> 8800c6387dd0 810761f3 8800d99a7828 8800d8df8a00
> 8800d8df8a40 00fa fffe 8800c6387e30
> Call Trace:
> --
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