[Bug 109692] deadlock occurs during GPU reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109692

--- Comment #10 from mikhail.v.gavrilov at gmail.com ---
Even without reproducing GPU hang in kernel log I found "suspicious RCU usage"
and some errors.

[drm:amdgpu_ctx_mgr_entity_fini [amdgpu]] *ERROR* ctx 000000002caf7aed is still
alive
[drm:amdgpu_ctx_mgr_fini [amdgpu]] *ERROR* ctx 000000002caf7aed is still alive

=============================
WARNING: suspicious RCU usage
5.0.0-rc1-drm-next-kernel+ #1 Tainted: G         C       
-----------------------------
include/linux/rcupdate.h:280 Illegal context switch in RCU read-side critical
section!

other info that might help us debug this:

rcu_scheduler_active = 2, debug_locks = 1
3 locks held by CrashBandicootN/26312:
 #0: 00000000eb680bad (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x4d/0x60
 #1: 00000000b3a3c406 (&p->lock){+.+.}, at: seq_read+0x38/0x410
 #2: 000000007c893f05 (rcu_read_lock){....}, at: dev_seq_start+0x5/0x100

stack backtrace:
CPU: 8 PID: 26312 Comm: CrashBandicootN Tainted: G         C       
5.0.0-rc1-drm-next-kernel+ #1
Hardware name: System manufacturer System Product Name/ROG STRIX X470-I GAMING,
BIOS 1103 11/16/2018
Call Trace:
 dump_stack+0x85/0xc0
 ___might_sleep+0x100/0x180
 __mutex_lock+0x61/0x930
 ? igb_get_stats64+0x29/0x80 [igb]
 ? seq_vprintf+0x33/0x50
 ? igb_get_stats64+0x29/0x80 [igb]
 igb_get_stats64+0x29/0x80 [igb]
 dev_get_stats+0x5c/0xc0
 dev_seq_printf_stats+0x33/0xe0
 dev_seq_show+0x10/0x30
 seq_read+0x2fa/0x410
 proc_reg_read+0x3c/0x60
 __vfs_read+0x37/0x1b0
 vfs_read+0xb2/0x170
 ksys_read+0x52/0xc0
 do_syscall_64+0x5c/0xa0
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f2188d8934c
Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 79 c9 01 00 48 8b 54
24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 30
44 89 c7 48 89 44 24 08 e8 af c9 01 00 48
RSP: 002b:000000000023f010 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000000007d11b6d0 RCX: 00007f2188d8934c
RDX: 0000000000000400 RSI: 000000007d0dd4f0 RDI: 000000000000007b
RBP: 0000000000000d68 R08: 0000000000000000 R09: 0000000000000000
R10: 00007f2188621c40 R11: 0000000000000246 R12: 00007f2188e59740
R13: 00007f2188e5a340 R14: 00000000000001ff R15: 000000007d11b6d0

This only occures when I use "amd-staging-drm-next".

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