Re: Linux 5.14-rc1

From: Jon Masters
Date: Mon Jul 12 2021 - 03:54:10 EST

On 7/11/21 6:49 PM, Linus Torvalds wrote:
You all know the drill by now. It's been the usual two weeks of merge
window, and not it's closed, and 5.14-rc1 is out there.

I happened to be installing a Fedora 34 (x86) VM for something and did a test kernel compile that hung on boot. Setting up a serial console I get the below backtrace from ttm but I have not had chance to look at it.

Fedora 34 (Server Edition)
Kernel 5.14.0-rc1 on an x86_64 (ttyS0)

Web console: https://fedora:9090/ or https://192.168.1.91:9090/

fedora login: [ 11.263539] BUG: kernel NULL pointer dereference, address: 0000000000000010
[ 11.266355] #PF: supervisor read access in kernel mode
[ 11.268409] #PF: error_code(0x0000) - not-present page
[ 11.270456] PGD 0 P4D 0
[ 11.271506] Oops: 0000 [#1] SMP PTI
[ 11.272903] CPU: 1 PID: 41 Comm: kworker/1:1 Not tainted 5.14.0-rc1 #1
[ 11.275488] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
[ 11.278274] Workqueue: events ttm_device_delayed_workqueue [ttm]
[ 11.279865] RIP: 0010:qxl_bo_delete_mem_notify+0x19/0x40 [qxl]
[ 11.281404] Code: 89 e7 45 31 e4 e8 67 bf f6 dc eb ea 0f 1f 44 00 00 0f 1f 44 00 00 55 48 89 fd e8 a2 02 00 00 84 c0 74 0d 48 8b 85 68 01 00 00 <83> 78 10 03 74 02 5d c3 8b 85 64 02 00 00 85 c0 74 f4 48 8b 7d 08
[ 11.286271] RSP: 0018:ffffb7a24017fdd0 EFLAGS: 00010202
[ 11.287616] RAX: 0000000000000000 RBX: ffff9da7c08e8670 RCX: ffff9da7c0b30000
[ 11.288978] RDX: ffff9da7c27f7990 RSI: ffff9da7c27f7990 RDI: ffff9da7c27f7800
[ 11.290332] RBP: ffff9da7c27f7800 R08: ffff9da7c27f7990 R09: 0000000000000000
[ 11.291690] R10: ffff9da7c991ec00 R11: 0000000000000000 R12: ffff9da7c27f7990
[ 11.293021] R13: ffff9da7c27f7800 R14: ffff9da7c27f7960 R15: ffff9da7c27f7990
[ 11.294349] FS: 0000000000000000(0000) GS:ffff9da937c80000(0000) knlGS:0000000000000000
[ 11.295853] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 11.296935] CR2: 0000000000000010 CR3: 000000010c178004 CR4: 0000000000370ee0
[ 11.298111] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 11.299120] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 11.300130] Call Trace:
[ 11.300489] ttm_bo_cleanup_memtype_use+0x22/0x60 [ttm]
[ 11.301256] ttm_bo_release+0x1a1/0x300 [ttm]
[ 11.301879] ttm_bo_delayed_delete+0x1be/0x220 [ttm]
[ 11.302587] ttm_device_delayed_workqueue+0x18/0x40 [ttm]
[ 11.303358] process_one_work+0x1ec/0x390
[ 11.303941] worker_thread+0x53/0x3e0
[ 11.304464] ? process_one_work+0x390/0x390
[ 11.305066] kthread+0x127/0x150
[ 11.305535] ? set_kthread_struct+0x40/0x40
[ 11.306188] ret_from_fork+0x22/0x30
[ 11.306749] Modules linked in: 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 ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw iptable_security ip_set nf_tables rfkill nfnetlink ip6table_filter ip6_tables iptable_filter sunrpc vfat fat snd_hda_codec_generic intel_rapl_msr snd_hda_intel intel_rapl_common snd_intel_dspcfg snd_hda_codec isst_if_common snd_hwdep snd_hda_core iTCO_wdt intel_pmc_bxt iTCO_vendor_support kvm_intel snd_seq snd_seq_device snd_pcm kvm joydev irqbypass i2c_i801 rapl i2c_smbus snd_timer snd virtio_balloon lpc_ich soundcore fuse zram ip_tables xfs qxl drm_ttm_helper ttm drm_kms_helper crct10dif_pclmul crc32_pclmul crc32c_intel cec drm ghash_clmulni_intel serio_raw virtio_blk qemu_fw_cfg virtio_net virtio_console net_failover failover pkcs8_key_parser
[ 11.318215] CR2: 0000000000000010
[ 11.318670] ---[ end trace 20fb2a3e9bc19a76 ]---
[ 11.319300] RIP: 0010:qxl_bo_delete_mem_notify+0x19/0x40 [qxl]
[ 11.320090] Code: 89 e7 45 31 e4 e8 67 bf f6 dc eb ea 0f 1f 44 00 00 0f 1f 44 00 00 55 48 89 fd e8 a2 02 00 00 84 c0 74 0d 48 8b 85 68 01 00 00 <83> 78 10 03 74 02 5d c3 8b 85 64 02 00 00 85 c0 74 f4 48 8b 7d 08
[ 11.322574] RSP: 0018:ffffb7a24017fdd0 EFLAGS: 00010202
[ 11.323271] RAX: 0000000000000000 RBX: ffff9da7c08e8670 RCX: ffff9da7c0b30000
[ 11.324226] RDX: ffff9da7c27f7990 RSI: ffff9da7c27f7990 RDI: ffff9da7c27f7800
[ 11.325186] RBP: ffff9da7c27f7800 R08: ffff9da7c27f7990 R09: 0000000000000000
[ 11.326145] R10: ffff9da7c991ec00 R11: 0000000000000000 R12: ffff9da7c27f7990
[ 11.327092] R13: ffff9da7c27f7800 R14: ffff9da7c27f7960 R15: ffff9da7c27f7990
[ 11.328032] FS: 0000000000000000(0000) GS:ffff9da937c80000(0000) knlGS:0000000000000000
[ 11.329086] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 11.329848] CR2: 0000000000000010 CR3: 000000010c178004 CR4: 0000000000370ee0
[ 11.330810] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 11.331746] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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Computer Architect