What hardware are you using and how do you exactly trigger this? Thanks, Christian. Am 07.04.21 um 11:30 schrieb Mikhail Gavrilov:
Hi! During the 5.12 testing cycle I observed the repeatable bug when launching heavy graphic applications. The kernel log is flooded with the message "Unexpected multihop in swaput - likely driver bug.". Trace: [ 8707.814899] ------------[ cut here ]------------ [ 8707.814920] Unexpected multihop in swaput - likely driver bug. [ 8707.814998] WARNING: CPU: 19 PID: 28231 at drivers/gpu/drm/ttm/ttm_bo.c:1484 ttm_bo_swapout+0x40b/0x420 [ttm] [ 8707.815011] Modules linked in: tun uinput snd_seq_dummy rfcomm snd_hrtimer netconsole nft_objref nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nf_tables nfnetlink cmac bnep sunrpc vfat fat hid_logitech_hidpp hid_logitech_dj intel_rapl_msr snd_hda_codec_realtek intel_rapl_common mt76x2u snd_hda_codec_generic mt76x2_common mt76x02_usb iwlmvm ledtrig_audio snd_hda_codec_hdmi mt76_usb mt76x02_lib snd_hda_intel mt76 snd_intel_dspcfg snd_intel_sdw_acpi mac80211 joydev snd_usb_audio snd_hda_codec uvcvideo edac_mce_amd videobuf2_vmalloc snd_hda_core snd_usbmidi_lib videobuf2_memops snd_hwdep iwlwifi snd_rawmidi btusb videobuf2_v4l2 kvm_amd snd_seq videobuf2_common btrtl btbcm videodev btintel snd_seq_device kvm mc cfg80211 bluetooth snd_pcm libarc4 eeepc_wmi snd_timer asus_wmi irqbypass xpad sp5100_tco [ 8707.815065] sparse_keymap ecdh_generic ff_memless video ecc wmi_bmof i2c_piix4 snd rapl k10temp soundcore rfkill acpi_cpufreq ip_tables amdgpu drm_ttm_helper ttm iommu_v2 gpu_sched drm_kms_helper crct10dif_pclmul crc32_pclmul crc32c_intel cec drm ghash_clmulni_intel igb ccp nvme dca nvme_core i2c_algo_bit wmi pinctrl_amd fuse [ 8707.815096] CPU: 19 PID: 28231 Comm: kworker/u64:1 Tainted: G W --------- --- 5.12.0-0.rc6.184.fc35.x86_64+debug #1 [ 8707.815101] Hardware name: System manufacturer System Product Name/ROG STRIX X570-I GAMING, BIOS 3603 03/20/2021 [ 8707.815106] Workqueue: ttm_swap ttm_shrink_work [ttm] [ 8707.815114] RIP: 0010:ttm_bo_swapout+0x40b/0x420 [ttm] [ 8707.815122] Code: 10 00 00 48 c1 e2 0c 48 c1 e6 0c e8 3f 37 fa c8 e9 71 fe ff ff 83 f8 b8 0f 85 a9 fe ff ff 48 c7 c7 28 32 37 c0 e8 02 2b 98 c9 <0f> 0b e9 96 fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 0f [ 8707.815126] RSP: 0018:ffffa306d20e7d58 EFLAGS: 00010292 [ 8707.815130] RAX: 0000000000000032 RBX: ffffffffc0379260 RCX: 0000000000000027 [ 8707.815133] RDX: ffff918c091daae8 RSI: 0000000000000001 RDI: ffff918c091daae0 [ 8707.815136] RBP: ffff918602210058 R08: 0000000000000000 R09: 0000000000000000 [ 8707.815138] R10: ffffa306d20e7b90 R11: ffff918c2e2fffe8 R12: 00000000ffffffb8 [ 8707.815141] R13: ffffffffc03792a0 R14: ffff9186022102c0 R15: 0000000000000001 [ 8707.815145] FS: 0000000000000000(0000) GS:ffff918c09000000(0000) knlGS:0000000000000000 [ 8707.815148] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 8707.815151] CR2: 0000325c84d12000 CR3: 0000000776c28000 CR4: 0000000000350ee0 [ 8707.815154] Call Trace: [ 8707.815164] ttm_shrink+0xa6/0xe0 [ttm] [ 8707.815171] ttm_shrink_work+0x36/0x40 [ttm] [ 8707.815177] process_one_work+0x2b0/0x5e0 [ 8707.815185] worker_thread+0x55/0x3c0 [ 8707.815188] ? process_one_work+0x5e0/0x5e0 [ 8707.815192] kthread+0x13a/0x150 [ 8707.815196] ? __kthread_bind_mask+0x60/0x60 [ 8707.815199] ret_from_fork+0x22/0x30 [ 8707.815207] irq event stamp: 0 [ 8707.815209] hardirqs last enabled at (0): [<0000000000000000>] 0x0 [ 8707.815213] hardirqs last disabled at (0): [<ffffffff890ddafb>] copy_process+0x91b/0x1e10 [ 8707.815218] softirqs last enabled at (0): [<ffffffff890ddafb>] copy_process+0x91b/0x1e10 [ 8707.815222] softirqs last disabled at (0): [<0000000000000000>] 0x0 [ 8707.815224] ---[ end trace 29252aa87289bbaa ]--- Full kernel log: https://pastebin.com/mmAxwBYc $ /usr/src/kernels/`uname -r`/scripts/faddr2line /lib/debug/lib/modules/`uname -r`/kernel/drivers/gpu/drm/ttm/ttm.ko.debug ttm_bo_swapout+0x40b ttm_bo_swapout+0x40b/0x420: ttm_bo_swapout at /usr/src/debug/kernel-5.12-rc6/linux-5.12.0-0.rc6.184.fc35.x86_64/drivers/gpu/drm/ttm/ttm_bo.c:1484 (discriminator 1) $ git blame drivers/gpu/drm/ttm/ttm_bo.c -L 1475,1494 Blaming lines: 1% (20/1530), done. ebdf565169af0 (Dave Airlie 2020-10-29 13:58:52 +1000 1475) memset(&hop, 0, sizeof(hop)); ba4e7d973dd09 (Thomas Hellstrom 2009-06-10 15:20:19 +0200 1476) ba4e7d973dd09 (Thomas Hellstrom 2009-06-10 15:20:19 +0200 1477) evict_mem = bo->mem; ba4e7d973dd09 (Thomas Hellstrom 2009-06-10 15:20:19 +0200 1478) evict_mem.mm_node = NULL; ce65b874001d7 (Christian König 2020-09-30 16:44:16 +0200 1479) evict_mem.placement = 0; ba4e7d973dd09 (Thomas Hellstrom 2009-06-10 15:20:19 +0200 1480) evict_mem.mem_type = TTM_PL_SYSTEM; ba4e7d973dd09 (Thomas Hellstrom 2009-06-10 15:20:19 +0200 1481) ebdf565169af0 (Dave Airlie 2020-10-29 13:58:52 +1000 1482) ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx, &hop); ebdf565169af0 (Dave Airlie 2020-10-29 13:58:52 +1000 1483) if (unlikely(ret != 0)) { ebdf565169af0 (Dave Airlie 2020-10-29 13:58:52 +1000 1484) WARN(ret == -EMULTIHOP, "Unexpected multihop in swaput - likely driver bug.\n"); ba4e7d973dd09 (Thomas Hellstrom 2009-06-10 15:20:19 +0200 1485) goto out; ebdf565169af0 (Dave Airlie 2020-10-29 13:58:52 +1000 1486) } ba4e7d973dd09 (Thomas Hellstrom 2009-06-10 15:20:19 +0200 1487) } ba4e7d973dd09 (Thomas Hellstrom 2009-06-10 15:20:19 +0200 1488) 61ede07055539 (Christian König 2016-06-06 10:17:57 +0200 1489) /** 61ede07055539 (Christian König 2016-06-06 10:17:57 +0200 1490) * Make sure BO is idle. 61ede07055539 (Christian König 2016-06-06 10:17:57 +0200 1491) */ 61ede07055539 (Christian König 2016-06-06 10:17:57 +0200 1492) 61ede07055539 (Christian König 2016-06-06 10:17:57 +0200 1493) ret = ttm_bo_wait(bo, false, false); 61ede07055539 (Christian König 2016-06-06 10:17:57 +0200 1494) if (unlikely(ret != 0))
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