This is not a MM bug. ;-)
And this change is made by below commit.
commit 59361316afcb08569af21e1af83e89c7051c055a
Author: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
Date: Thu Aug 2 10:13:10 2018 -0700
igb: reduce CPU0 latency when updating statistics
On 2019/01/18 18:21, Mikhail Gavrilov wrote:
> Hi folks.
>
> Starting from 5.0 rc1 every time after launch atop I see subject error message.
>
> And this issue afle negatively impact on system performance.
>
> Unclear on which subsystem it related but I hope here in mm list
> somebody help clarify what is happened.
>
> Thanks.
>
> Full dmesg also attached.
>
> [ 2164.694709] BUG: sleeping function called from invalid context at
> kernel/locking/mutex.c:908
> [ 2164.694724] in_atomic(): 1, irqs_disabled(): 0, pid: 10498, name: atop
> [ 2164.694729] 2 locks held by atop/10498:
> [ 2164.694732] #0: 0000000061e564e5 (&p->lock){+.+.}, at: seq_read+0x41/0x430
> [ 2164.694753] #1: 0000000081e34167 (rcu_read_lock){....}, at:
> dev_seq_start+0x5/0x120
> [ 2164.694762] CPU: 10 PID: 10498 Comm: atop Tainted: G C
> 5.0.0-0.rc2.git1.2.fc30.x86_64 #1
> [ 2164.694765] Hardware name: System manufacturer System Product
> Name/ROG STRIX X470-I GAMING, BIOS 1103 11/16/2018
> [ 2164.694768] Call Trace:
> [ 2164.694773] dump_stack+0x85/0xc0
> [ 2164.694778] ___might_sleep.cold.73+0xac/0xbc
> [ 2164.694783] __mutex_lock+0x55/0x9a0
> [ 2164.694788] ? seq_vprintf+0x30/0x50
> [ 2164.694792] ? seq_printf+0x53/0x70
> [ 2164.694806] ? igb_get_stats64+0x29/0x80 [igb]
> [ 2164.694813] igb_get_stats64+0x29/0x80 [igb]
> [ 2164.694818] dev_get_stats+0x5b/0xc0
> [ 2164.694822] dev_seq_printf_stats+0x32/0xe0
> [ 2164.694836] dev_seq_show+0x10/0x30
> [ 2164.694840] seq_read+0x2fd/0x430
> [ 2164.694847] proc_reg_read+0x39/0x60
> [ 2164.694852] __vfs_read+0x36/0x1a0
> [ 2164.694861] vfs_read+0x9f/0x160
> [ 2164.694866] ksys_read+0x52/0xc0
> [ 2164.694872] do_syscall_64+0x60/0x1f0
> [ 2164.694876] entry_SYSCALL_64_after_hwframe+0x49/0xbe
> [ 2164.694880] RIP: 0033:0x7fa0f51bd255
> [ 2164.694883] Code: fe ff ff 50 48 8d 3d 2a 03 0a 00 e8 35 01 02 00
> 0f 1f 44 00 00 f3 0f 1e fa 48 8d 05 c5 94 0d 00 8b 00 85 c0 75 0f 31
> c0 0f 05 <48> 3d 00 f0 ff ff 77 53 c3 66 90 41 54 49 89 d4 55 48 89 f5
> 53 89
> [ 2164.694886] RSP: 002b:00007ffe79288db8 EFLAGS: 00000246 ORIG_RAX:
> 0000000000000000
> [ 2164.694890] RAX: ffffffffffffffda RBX: 0000000000a55260 RCX: 00007fa0f51bd255
> [ 2164.694892] RDX: 0000000000000400 RSI: 0000000000a55490 RDI: 0000000000000004
> [ 2164.694895] RBP: 0000000000000d68 R08: 0000000000000001 R09: 0000000000000000
> [ 2164.694898] R10: 00007fa0f50a3740 R11: 0000000000000246 R12: 00007fa0f528d740
> [ 2164.694900] R13: 00007fa0f528e340 R14: 00000000000007ff R15: 0000000000a55260
>
>
>
> --
> Best Regards,
> Mike Gavrilov.
>
