https://bugs.freedesktop.org/show_bug.cgi?id=101954

Bug ID: 101954 Summary: WARNING: suspicious RCU usage in amdgpu_bo_list_get Product: DRI Version: unspecified Hardware: Other OS: All Status: NEW Severity: normal Priority: medium Component: DRM/AMDgpu Assignee: dri-devel@lists.freedesktop.org Reporter: yaneti@declera.com

Fedora rawhide with debug config as http://pkgs.fedoraproject.org/cgit/rpms/kernel.git/tree/kernel-x86_64-debug....

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Baffin [Radeon RX 460] (rev cf) 1 DP 4k monitor

This is something that seems to've started appearing after the rcu changes in this merge window ....

[ 12.958667] ============================= [ 12.958678] WARNING: suspicious RCU usage [ 12.958691] 4.13.0-0.rc2.git1.1.fc27.x86_64 #1 Not tainted [ 12.958701] ----------------------------- [ 12.958714] ./include/linux/rcupdate.h:297 Illegal context switch in RCU read-side critical section! [ 12.958724] other info that might help us debug this:

[ 12.958737] rcu_scheduler_active = 2, debug_locks = 1 [ 12.958749] 1 lock held by amdgpu_cs:0/1226: [ 12.958758] #0: (rcu_read_lock){......}, at: [<ffffffffc04ff9b5>] amdgpu_bo_list_get+0x5/0x130 [amdgpu] [ 12.958874] stack backtrace: [ 12.958890] CPU: 3 PID: 1226 Comm: amdgpu_cs:0 Not tainted 4.13.0-0.rc2.git1.1.fc27.x86_64 #1 [ 12.958901] Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./990FXA-UD3 R5, BIOS F2 04/01/2015 [ 12.958911] Call Trace: [ 12.958931] dump_stack+0x8e/0xd6 [ 12.958953] lockdep_rcu_suspicious+0xc5/0x100 [ 12.959033] ? amdgpu_bo_list_get+0x81/0x130 [amdgpu] [ 12.959051] ___might_sleep+0x1ad/0x250 [ 12.959073] __might_sleep+0x4a/0x80 [ 12.959095] __mutex_lock+0x59/0xa00 [ 12.959110] ? trace_hardirqs_on+0xd/0x10 [ 12.959141] ? lock_acquire+0xa3/0x1f0 [ 12.959217] ? amdgpu_bo_list_get+0x5/0x130 [amdgpu] [ 12.959243] mutex_lock_nested+0x1b/0x20 [ 12.959253] ? mutex_lock_nested+0x1b/0x20 [ 12.959321] amdgpu_bo_list_get+0x81/0x130 [amdgpu] [ 12.959389] amdgpu_cs_ioctl+0xcb/0x1c50 [amdgpu] [ 12.959413] ? debug_check_no_obj_freed+0x15f/0x24a [ 12.959562] ? amdgpu_cs_find_mapping+0xa0/0xa0 [amdgpu] [ 12.959607] drm_ioctl_kernel+0x5d/0xb0 [drm] [ 12.959657] drm_ioctl+0x31b/0x3d0 [drm] [ 12.959726] ? amdgpu_cs_find_mapping+0xa0/0xa0 [amdgpu] [ 12.959767] ? trace_hardirqs_on_caller+0xf4/0x190 [ 12.959787] ? trace_hardirqs_on+0xd/0x10 [ 12.959870] amdgpu_drm_ioctl+0x4f/0x90 [amdgpu] [ 12.959895] do_vfs_ioctl+0xa6/0x6c0 [ 12.959940] SyS_ioctl+0x79/0x90 [ 12.959968] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 12.959981] RIP: 0033:0x7fc88df4a267 [ 12.959991] RSP: 002b:00007fc86a0b98b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 12.960008] RAX: ffffffffffffffda RBX: 00007fc85c000000 RCX: 00007fc88df4a267 [ 12.960031] RDX: 00007fc86a0b9a10 RSI: 00000000c0186444 RDI: 000000000000000c [ 12.960040] RBP: 0000000000021000 R08: 00007fc86a0b9900 R09: 00007fc86a0b9950 [ 12.960050] R10: 0000000000000002 R11: 0000000000000246 R12: 00007fc860000000 [ 12.960061] R13: 0000000002ef5000 R14: 0000000000000000 R15: 0000000000000000 [ 12.960287] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:747 [ 12.960301] in_atomic(): 1, irqs_disabled(): 0, pid: 1226, name: amdgpu_cs:0 [ 12.960313] 1 lock held by amdgpu_cs:0/1226: [ 12.960323] #0: (rcu_read_lock){......}, at: [<ffffffffc04ff9b5>] amdgpu_bo_list_get+0x5/0x130 [amdgpu] [ 12.960422] CPU: 3 PID: 1226 Comm: amdgpu_cs:0 Not tainted 4.13.0-0.rc2.git1.1.fc27.x86_64 #1 [ 12.960431] Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./990FXA-UD3 R5, BIOS F2 04/01/2015 [ 12.960439] Call Trace: [ 12.960453] dump_stack+0x8e/0xd6 [ 12.960470] ___might_sleep+0x164/0x250 [ 12.960492] __might_sleep+0x4a/0x80 [ 12.960515] __mutex_lock+0x59/0xa00 [ 12.960530] ? trace_hardirqs_on+0xd/0x10 [ 12.960561] ? lock_acquire+0xa3/0x1f0 [ 12.960638] ? amdgpu_bo_list_get+0x5/0x130 [amdgpu] [ 12.960673] mutex_lock_nested+0x1b/0x20 [ 12.960686] ? mutex_lock_nested+0x1b/0x20 [ 12.960758] amdgpu_bo_list_get+0x81/0x130 [amdgpu] [ 12.960832] amdgpu_cs_ioctl+0xcb/0x1c50 [amdgpu] [ 12.960861] ? debug_check_no_obj_freed+0x15f/0x24a [ 12.961043] ? amdgpu_cs_find_mapping+0xa0/0xa0 [amdgpu] [ 12.961083] drm_ioctl_kernel+0x5d/0xb0 [drm] [ 12.961134] drm_ioctl+0x31b/0x3d0 [drm] [ 12.961204] ? amdgpu_cs_find_mapping+0xa0/0xa0 [amdgpu] [ 12.961241] ? trace_hardirqs_on_caller+0xf4/0x190 [ 12.961262] ? trace_hardirqs_on+0xd/0x10 [ 12.961346] amdgpu_drm_ioctl+0x4f/0x90 [amdgpu] [ 12.961371] do_vfs_ioctl+0xa6/0x6c0 [ 12.961415] SyS_ioctl+0x79/0x90 [ 12.961443] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 12.961455] RIP: 0033:0x7fc88df4a267 [ 12.961466] RSP: 002b:00007fc86a0b98b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 12.961481] RAX: ffffffffffffffda RBX: 00007fc85c000000 RCX: 00007fc88df4a267 [ 12.961488] RDX: 00007fc86a0b9a10 RSI: 00000000c0186444 RDI: 000000000000000c [ 12.961496] RBP: 0000000000021000 R08: 00007fc86a0b9900 R09: 00007fc86a0b9950 [ 12.961504] R10: 0000000000000002 R11: 0000000000000246 R12: 00007fc860000000 [ 12.961511] R13: 0000000002ef5000 R14: 0000000000000000 R15: 0000000000000000