Hi,

With Linux 5.14 kernel series, I often get this warning:

okt 12 16:36:05 piranha kernel: ------------[ cut here ]------------ okt 12 16:36:05 piranha kernel: WARNING: CPU: 11 PID: 1 at drivers/gpu/drm/ttm/ttm_bo.c:409 ttm_bo_release+0x2d1/0x300 [ttm] okt 12 16:36:05 piranha kernel: Modules linked in: xt_recent ip6t_REJECT nf_reject_ipv6 xt_multiport xt_comment ip6_tables xt_hashlimit xt_mark xt_CT xt_NFLOG nfnetlink_log xt_LOG nf_log_syslog nf_conntrack_tftp nf_conntrack_sip nf_connt> okt 12 16:36:05 piranha kernel: gpu_sched radeon ppdev snd_hda_codec drm_ttm_helper ttm aesni_intel snd_hda_core evdev crypto_simd snd_hwdep drm_kms_helper snd_pcm cryptd wmi_bmof pcspkr rapl efi_pstore snd_timer bfq cec ccp snd rc_core> okt 12 16:36:05 piranha kernel: CPU: 11 PID: 1 Comm: systemd Not tainted 5.14.0-2-amd64 #1 Debian 5.14.9-2 okt 12 16:36:05 piranha kernel: Hardware name: Micro-Star International Co., Ltd. MS-7A34/B350 PC MATE (MS-7A34), BIOS A.J0 01/23/2019 okt 12 16:36:05 piranha kernel: RIP: 0010:ttm_bo_release+0x2d1/0x300 [ttm] okt 12 16:36:05 piranha kernel: Code: 65 23 00 00 e9 83 fd ff ff e8 3b 0e 31 ce e9 bc fd ff ff 49 8b 7e 98 b9 4c 1d 00 00 31 d2 be 01 00 00 00 e8 a1 32 31 ce eb a2 <0f> 0b e9 50 fd ff ff e8 d3 13 31 ce e9 fd fe ff ff be 03 00 00 00 okt 12 16:36:05 piranha kernel: RSP: 0018:ffffa84d8003be18 EFLAGS: 00010202 okt 12 16:36:05 piranha kernel: RAX: 0000000000000001 RBX: ffffa84d8003be60 RCX: 0000000000000000 okt 12 16:36:05 piranha kernel: RDX: 0000000000000001 RSI: ffff95e4abf95b00 RDI: ffff95e482cde9b8 okt 12 16:36:05 piranha kernel: RBP: ffff95e486f05288 R08: ffff95e482cde9b8 R09: 0000000000000064 okt 12 16:36:05 piranha kernel: R10: 0000000000000010 R11: ffff95e4f8c23a10 R12: ffff95e4d28f2a18 okt 12 16:36:05 piranha kernel: R13: ffff95e482cde858 R14: ffff95e482cde9b8 R15: 0000000000000000 okt 12 16:36:05 piranha kernel: FS: 00007f269dee6900(0000) GS:ffff95e78eec0000(0000) knlGS:0000000000000000 okt 12 16:36:05 piranha kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 okt 12 16:36:05 piranha kernel: CR2: 0000563fbde29530 CR3: 00000001045ee000 CR4: 00000000003506e0 okt 12 16:36:05 piranha kernel: Call Trace: okt 12 16:36:05 piranha kernel: amdgpu_bo_unref+0x1a/0x30 [amdgpu] okt 12 16:36:05 piranha kernel: amdgpu_gem_object_free+0x30/0x50 [amdgpu] okt 12 16:36:05 piranha kernel: drm_gem_dmabuf_release+0x36/0x50 [drm] okt 12 16:36:05 piranha kernel: dma_buf_release+0x3a/0x80 okt 12 16:36:05 piranha kernel: __dentry_kill+0x106/0x180 okt 12 16:36:05 piranha kernel: __fput+0xe3/0x240 okt 12 16:36:05 piranha kernel: task_work_run+0x65/0xa0 okt 12 16:36:05 piranha kernel: exit_to_user_mode_prepare+0x173/0x180 okt 12 16:36:05 piranha kernel: syscall_exit_to_user_mode+0x23/0x40 okt 12 16:36:05 piranha kernel: ? __x64_sys_close+0xe/0x40 okt 12 16:36:05 piranha kernel: do_syscall_64+0x48/0xc0 okt 12 16:36:05 piranha kernel: entry_SYSCALL_64_after_hwframe+0x44/0xae okt 12 16:36:05 piranha kernel: RIP: 0033:0x7f269e79b8bb okt 12 16:36:05 piranha kernel: Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 83 fb ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 e1 fb ff ff 8b 44 okt 12 16:36:05 piranha kernel: RSP: 002b:00007fffc3c46910 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 okt 12 16:36:05 piranha kernel: RAX: 0000000000000000 RBX: 00007f269dee66d0 RCX: 00007f269e79b8bb okt 12 16:36:05 piranha kernel: RDX: 0000000000000002 RSI: 0000000563fbdd73 RDI: 0000000000000019 okt 12 16:36:05 piranha kernel: RBP: 0000000000000019 R08: 0000000000000000 R09: 0000563fbbf5f8ca okt 12 16:36:05 piranha kernel: R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 okt 12 16:36:05 piranha kernel: R13: 0000000000000000 R14: 0000563fbbf61108 R15: 0000563fbde422a0 okt 12 16:36:05 piranha kernel: ---[ end trace 807bb557a05dc0c6 ]---

It seems to happen often at shutdown but also shortly after boot. I'm also experiencing frequent hangs on this system, but I don't know whether these are related to this warning.

The graphics card is: 1c:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Pitcairn PRO [Radeon HD 7850 / R7 265 / R9 270 1024SP] [1002:6819]

and I'm using these boot options: radeon.si_support=0 amdgpu.si_support=1

This seems to be the same problem as reported here for 5.15-rc4: https://bugzilla.kernel.org/show_bug.cgi?id=214621