kernel BUG at fs/ext4/inode.c:2721!

Submitted by Robert Holmes

Assigned to Intel GFX Bugs mailing list

Link to original bug (#112012)

Description

Starting with 5.3, I've had the following behavioral pattern. First, soon after booting, a kernel WARNING as follows:

Oct 03 04:39:51 laptop kernel: WARNING: CPU: 5 PID: 198 at fs/ext4/inode.c:3941 ext4_set_page_dirty+0x3e/0x50
Oct 03 04:39:51 laptop kernel: Modules linked in: squashfs zstd_decompress loop ccm ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 xt_conntrack ebtable_nat ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat iptable_mangle iptable_raw iptable_security nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables ppdev parport fuse sunrpc vfat fat snd_hda_codec_hdmi snd_hda_codec_realtek iwlmvm snd_hda_codec_generic ledtrig_audio x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_intel mac80211 snd_hda_codec kvm_intel snd_hda_core snd_hwdep libarc4 snd_seq iwlwifi kvm snd_seq_device irqbypass intel_cstate snd_pcm iTCO_wdt intel_uncore asus_nb_wmi mei_hdcp iTCO_vendor_support intel_rapl_msr snd_timer cfg80211 asus_wmi intel_rapl_perf processor_thermal_device rtsx_pci_ms snd sparse_keymap joydev mei_me memstick i2c_i801 soundcore idma64 rfkill intel_rapl_common mei
Oct 03 04:39:51 laptop kernel: intel_pch_thermal elan_i2c intel_lpss_pci intel_lpss intel_soc_dts_iosf int3403_thermal int340x_thermal_zone int3400_thermal acpi_thermal_rel acpi_pad dm_crypt i915 nouveau ttm crct10dif_pclmul i2c_algo_bit crc32_pclmul rtsx_pci_sdmmc drm_kms_helper crc32c_intel mmc_core nvme mxm_wmi drm nvme_core ghash_clmulni_intel serio_raw rtsx_pci r8169 hid_microsoft ff_memless i2c_hid wmi video [last unloaded: vmnet]
Oct 03 04:39:51 laptop kernel: CPU: 5 PID: 198 Comm: kworker/u16:4 Tainted: G O 5.3.2-300.fc30.x86_64 #1 (moved)
Oct 03 04:39:51 laptop kernel: Hardware name: ASUSTeK COMPUTER INC. N552VX/N552VX, BIOS N552VX.300 08/31/2016
Oct 03 04:39:51 laptop kernel: Workqueue: i915 __i915_gem_free_work [i915]
Oct 03 04:39:51 laptop kernel: RIP: 0010:ext4_set_page_dirty+0x3e/0x50
Oct 03 04:39:51 laptop kernel: Code: 48 8b 00 a8 01 75 16 48 8b 57 08 48 8d 42 ff 83 e2 01 48 0f 44 c7 48 8b 00 a8 08 74 0d 48 8b 07 f6 c4 20 74 0f e9 a2 ef f7 ff <0f> 0b 48 8b 07 f6 c4 20 75 f1 0f 0b e9 91 ef f7 ff 90 0f 1f 44 00
Oct 03 04:39:51 laptop kernel: RSP: 0018:ffffa617002d3d90 EFLAGS: 00010246
Oct 03 04:39:51 laptop kernel: RAX: 0017fffe00002016 RBX: ffff99931606f800 RCX: 0000000000000000
Oct 03 04:39:51 laptop kernel: RDX: 0000000000000000 RSI: 00000003d4800000 RDI: ffffd2e80fe496c0
Oct 03 04:39:51 laptop kernel: RBP: ffffd2e80fe496c0 R08: 00000003d4800000 R09: ffff999429548188
Oct 03 04:39:51 laptop kernel: R10: 0000000000000000 R11: 0000000000000000 R12: 00000000003f925b
Oct 03 04:39:51 laptop kernel: R13: ffff99931630a400 R14: ffff99942d4917a0 R15: 0000000000000000
Oct 03 04:39:51 laptop kernel: FS: 0000000000000000(0000) GS:ffff999433b40000(0000) knlGS:0000000000000000
Oct 03 04:39:51 laptop kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Oct 03 04:39:51 laptop kernel: CR2: 00007f16bfc25688 CR3: 000000037a40a002 CR4: 00000000003606e0
Oct 03 04:39:51 laptop kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Oct 03 04:39:51 laptop kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Oct 03 04:39:51 laptop kernel: Call Trace:
Oct 03 04:39:51 laptop kernel: i915_gem_userptr_put_pages+0x14a/0x1e0 [i915]
Oct 03 04:39:51 laptop kernel: __i915_gem_object_put_pages+0x5e/0xa0 [i915]
Oct 03 04:39:51 laptop kernel: __i915_gem_free_objects+0x123/0x220 [i915]
Oct 03 04:39:51 laptop kernel: __i915_gem_free_work+0x64/0x90 [i915]
Oct 03 04:39:51 laptop kernel: process_one_work+0x19d/0x340
Oct 03 04:39:51 laptop kernel: worker_thread+0x50/0x3b0
Oct 03 04:39:51 laptop kernel: kthread+0xfb/0x130
Oct 03 04:39:51 laptop kernel: ? process_one_work+0x340/0x340
Oct 03 04:39:51 laptop kernel: ? kthread_park+0x80/0x80
Oct 03 04:39:51 laptop kernel: ret_from_fork+0x35/0x40
Oct 03 04:39:51 laptop kernel: ---[ end trace 8ee114643cf24b2e ]---

Later, perhaps a few days, another WARNING soon followed by a BUG:

Oct 07 01:32:44 laptop kernel: WARNING: CPU: 6 PID: 14209 at fs/ext4/inode.c:3942 ext4_set_page_dirty+0x48/0x50
Oct 07 01:32:44 laptop kernel: Modules linked in: xfs btrfs xor zstd_compress raid6_pq uas usb_storage squashfs zstd_decompress loop ccm ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 xt_conntrack ebtable_nat ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat iptable_mangle iptable_raw iptable_security nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables ppdev parport fuse sunrpc vfat fat snd_hda_codec_hdmi snd_hda_codec_realtek iwlmvm snd_hda_codec_generic ledtrig_audio x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_intel mac80211 snd_hda_codec kvm_intel snd_hda_core snd_hwdep libarc4 snd_seq iwlwifi kvm snd_seq_device irqbypass intel_cstate snd_pcm iTCO_wdt intel_uncore asus_nb_wmi mei_hdcp iTCO_vendor_support intel_rapl_msr snd_timer cfg80211 asus_wmi intel_rapl_perf processor_thermal_device rtsx_pci_ms snd sparse_keymap joydev mei_me memstick i2c_i801
Oct 07 01:32:44 laptop kernel: soundcore idma64 rfkill intel_rapl_common mei intel_pch_thermal elan_i2c intel_lpss_pci intel_lpss intel_soc_dts_iosf int3403_thermal int340x_thermal_zone int3400_thermal acpi_thermal_rel acpi_pad dm_crypt i915 nouveau ttm crct10dif_pclmul i2c_algo_bit crc32_pclmul rtsx_pci_sdmmc drm_kms_helper crc32c_intel mmc_core nvme mxm_wmi drm nvme_core ghash_clmulni_intel serio_raw rtsx_pci r8169 hid_microsoft ff_memless i2c_hid wmi video [last unloaded: vmnet]
Oct 07 01:32:44 laptop kernel: CPU: 6 PID: 14209 Comm: kworker/u16:1 Tainted: G W O 5.3.2-300.fc30.x86_64 #1 (moved)
Oct 07 01:32:44 laptop kernel: Hardware name: ASUSTeK COMPUTER INC. N552VX/N552VX, BIOS N552VX.300 08/31/2016
Oct 07 01:32:44 laptop kernel: Workqueue: i915 __i915_gem_free_work [i915]
Oct 07 01:32:44 laptop kernel: RIP: 0010:ext4_set_page_dirty+0x48/0x50
Oct 07 01:32:44 laptop kernel: Code: 08 48 8d 42 ff 83 e2 01 48 0f 44 c7 48 8b 00 a8 08 74 0d 48 8b 07 f6 c4 20 74 0f e9 a2 ef f7 ff 0f 0b 48 8b 07 f6 c4 20 75 f1 <0f> 0b e9 91 ef f7 ff 90 0f 1f 44 00 00 41 54 49 89 fc 55 89 d5 53
Oct 07 01:32:44 laptop kernel: RSP: 0018:ffffa617060dbd90 EFLAGS: 00010246
Oct 07 01:32:44 laptop kernel: RAX: 0017fffe00020016 RBX: ffff9993a4991000 RCX: 0000000000000000
Oct 07 01:32:44 laptop kernel: RDX: 0000000000000000 RSI: 000000037614f000 RDI: ffffd2e808eaac40
Oct 07 01:32:44 laptop kernel: RBP: ffffd2e808eaac40 R08: 000000037614f000 R09: 0000000000000001
Oct 07 01:32:44 laptop kernel: R10: ffff99940ceb6201 R11: 0000000000000000 R12: 000000000023aab1
Oct 07 01:32:44 laptop kernel: R13: ffff9990316eb600 R14: ffff9992c0bc8240 R15: 0000000000000000
Oct 07 01:32:44 laptop kernel: FS: 0000000000000000(0000) GS:ffff999433b80000(0000) knlGS:0000000000000000
Oct 07 01:32:44 laptop kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Oct 07 01:32:44 laptop kernel: CR2: 00003ae54cb46000 CR3: 000000037a40a001 CR4: 00000000003606e0
Oct 07 01:32:44 laptop kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Oct 07 01:32:44 laptop kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Oct 07 01:32:44 laptop kernel: Call Trace:
Oct 07 01:32:44 laptop kernel: i915_gem_userptr_put_pages+0x14a/0x1e0 [i915]
Oct 07 01:32:44 laptop kernel: __i915_gem_object_put_pages+0x5e/0xa0 [i915]
Oct 07 01:32:44 laptop kernel: __i915_gem_free_objects+0x123/0x220 [i915]
Oct 07 01:32:44 laptop kernel: __i915_gem_free_work+0x64/0x90 [i915]
Oct 07 01:32:44 laptop kernel: process_one_work+0x19d/0x340
Oct 07 01:32:44 laptop kernel: worker_thread+0x50/0x3b0
Oct 07 01:32:44 laptop kernel: kthread+0xfb/0x130
Oct 07 01:32:44 laptop kernel: ? process_one_work+0x340/0x340
Oct 07 01:32:44 laptop kernel: ? kthread_park+0x80/0x80
Oct 07 01:32:44 laptop kernel: ret_from_fork+0x35/0x40
Oct 07 01:32:44 laptop kernel: ---[ end trace 8ee114643cf24b2f ]---
Oct 07 01:33:15 laptop kernel: ------------[ cut here ]------------
Oct 07 01:33:15 laptop kernel: kernel BUG at fs/ext4/inode.c:2721!
Oct 07 01:33:15 laptop kernel: invalid opcode: 0000 [#1 (moved)] SMP PTI
Oct 07 01:33:15 laptop kernel: CPU: 2 PID: 14209 Comm: kworker/u16:1 Tainted: G W O 5.3.2-300.fc30.x86_64 #1 (moved)
Oct 07 01:33:15 laptop kernel: Hardware name: ASUSTeK COMPUTER INC. N552VX/N552VX, BIOS N552VX.300 08/31/2016
Oct 07 01:33:15 laptop kernel: Workqueue: writeback wb_workfn (flush-253:1)
Oct 07 01:33:15 laptop kernel: RIP: 0010:mpage_prepare_extent_to_map+0x25d/0x290
Oct 07 01:33:15 laptop kernel: Code: 00 75 3d e8 d5 3a 62 00 48 8b 04 24 48 39 44 24 10 0f 86 49 fe ff ff 31 c0 eb af 4c 89 ff e8 3a 2d e8 ff e9 b8 fe ff ff 0f 0b <0f> 0b 48 8d 7c 24 18 89 44 24 08 e8 43 3a e9 ff 8b 44 24 08 eb 8a
Oct 07 01:33:15 laptop kernel: RSP: 0018:ffffa617060db988 EFLAGS: 00010246
Oct 07 01:33:15 laptop kernel: RAX: 0017fffe0002003f RBX: ffffa617060db9b0 RCX: 000000000000074c
Oct 07 01:33:15 laptop kernel: RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffd2e80c2d41c0
Oct 07 01:33:15 laptop kernel: RBP: 0000000000002800 R08: 0000000000000000 R09: 0000000000000000
Oct 07 01:33:15 laptop kernel: R10: 0000000000000228 R11: ffffffffffffffff R12: ffffa617060dba20
Oct 07 01:33:15 laptop kernel: R13: ffff99940fc26798 R14: ffffa617060dbae0 R15: ffffd2e80c2d41c0
Oct 07 01:33:15 laptop kernel: FS: 0000000000000000(0000) GS:ffff999433a80000(0000) knlGS:0000000000000000
Oct 07 01:33:15 laptop kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Oct 07 01:33:15 laptop kernel: CR2: 00002cf01cf1a000 CR3: 000000037a40a003 CR4: 00000000003606e0
Oct 07 01:33:15 laptop kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Oct 07 01:33:15 laptop kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Oct 07 01:33:15 laptop kernel: Call Trace:
Oct 07 01:33:15 laptop kernel: ext4_writepages+0x3da/0xe20
Oct 07 01:33:15 laptop kernel: ? recalibrate_cpu_khz+0x10/0x10
Oct 07 01:33:15 laptop kernel: ? ktime_get+0x3c/0x90
Oct 07 01:33:15 laptop kernel: ? __switch_to_asm+0x40/0x70
Oct 07 01:33:15 laptop kernel: ? __switch_to_asm+0x40/0x70
Oct 07 01:33:15 laptop kernel: ? __switch_to_asm+0x40/0x70
Oct 07 01:33:15 laptop kernel: ? __switch_to_asm+0x34/0x70
Oct 07 01:33:15 laptop kernel: ? do_writepages+0x43/0xd0
Oct 07 01:33:15 laptop kernel: ? ext4_mark_inode_dirty+0x1d0/0x1d0
Oct 07 01:33:15 laptop kernel: do_writepages+0x43/0xd0
Oct 07 01:33:15 laptop kernel: ? __switch_to_asm+0x34/0x70
Oct 07 01:33:15 laptop kernel: __writeback_single_inode+0x3d/0x330
Oct 07 01:33:15 laptop kernel: writeback_sb_inodes+0x1fd/0x480
Oct 07 01:33:15 laptop kernel: __writeback_inodes_wb+0x4c/0xc0
Oct 07 01:33:15 laptop kernel: wb_writeback+0x255/0x2f0
Oct 07 01:33:15 laptop kernel: ? get_nr_inodes+0x32/0x50
Oct 07 01:33:15 laptop kernel: wb_workfn+0x38f/0x450
Oct 07 01:33:15 laptop kernel: ? __switch_to_asm+0x34/0x70
Oct 07 01:33:15 laptop kernel: process_one_work+0x19d/0x340
Oct 07 01:33:15 laptop kernel: worker_thread+0x50/0x3b0
Oct 07 01:33:15 laptop kernel: kthread+0xfb/0x130
Oct 07 01:33:15 laptop kernel: ? process_one_work+0x340/0x340
Oct 07 01:33:15 laptop kernel: ? kthread_park+0x80/0x80
Oct 07 01:33:15 laptop kernel: ret_from_fork+0x35/0x40
Oct 07 01:33:15 laptop kernel: Modules linked in: xfs btrfs xor zstd_compress raid6_pq uas usb_storage squashfs zstd_decompress loop ccm ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 xt_conntrack ebtable_nat ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat iptable_mangle iptable_raw iptable_security nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables ppdev parport fuse sunrpc vfat fat snd_hda_codec_hdmi snd_hda_codec_realtek iwlmvm snd_hda_codec_generic ledtrig_audio x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_intel mac80211 snd_hda_codec kvm_intel snd_hda_core snd_hwdep libarc4 snd_seq iwlwifi kvm snd_seq_device irqbypass intel_cstate snd_pcm iTCO_wdt intel_uncore asus_nb_wmi mei_hdcp iTCO_vendor_support intel_rapl_msr snd_timer cfg80211 asus_wmi intel_rapl_perf processor_thermal_device rtsx_pci_ms snd sparse_keymap joydev mei_me memstick i2c_i801
Oct 07 01:33:15 laptop kernel: soundcore idma64 rfkill intel_rapl_common mei intel_pch_thermal elan_i2c intel_lpss_pci intel_lpss intel_soc_dts_iosf int3403_thermal int340x_thermal_zone int3400_thermal acpi_thermal_rel acpi_pad dm_crypt i915 nouveau ttm crct10dif_pclmul i2c_algo_bit crc32_pclmul rtsx_pci_sdmmc drm_kms_helper crc32c_intel mmc_core nvme mxm_wmi drm nvme_core ghash_clmulni_intel serio_raw rtsx_pci r8169 hid_microsoft ff_memless i2c_hid wmi video [last unloaded: vmnet]
Oct 07 01:33:15 laptop kernel: ---[ end trace 8ee114643cf24b30 ]---
Oct 07 01:33:15 laptop kernel: RIP: 0010:mpage_prepare_extent_to_map+0x25d/0x290
Oct 07 01:33:15 laptop kernel: Code: 00 75 3d e8 d5 3a 62 00 48 8b 04 24 48 39 44 24 10 0f 86 49 fe ff ff 31 c0 eb af 4c 89 ff e8 3a 2d e8 ff e9 b8 fe ff ff 0f 0b <0f> 0b 48 8d 7c 24 18 89 44 24 08 e8 43 3a e9 ff 8b 44 24 08 eb 8a
Oct 07 01:33:15 laptop kernel: RSP: 0018:ffffa617060db988 EFLAGS: 00010246
Oct 07 01:33:15 laptop kernel: RAX: 0017fffe0002003f RBX: ffffa617060db9b0 RCX: 000000000000074c
Oct 07 01:33:15 laptop kernel: RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffd2e80c2d41c0
Oct 07 01:33:15 laptop kernel: RBP: 0000000000002800 R08: 0000000000000000 R09: 0000000000000000
Oct 07 01:33:15 laptop kernel: R10: 0000000000000228 R11: ffffffffffffffff R12: ffffa617060dba20
Oct 07 01:33:15 laptop kernel: R13: ffff99940fc26798 R14: ffffa617060dbae0 R15: ffffd2e80c2d41c0
Oct 07 01:33:15 laptop kernel: FS: 0000000000000000(0000) GS:ffff999433a80000(0000) knlGS:0000000000000000
Oct 07 01:33:15 laptop kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Oct 07 01:33:15 laptop kernel: CR2: 00002cf01cf1a000 CR3: 000000037a40a003 CR4: 00000000003606e0
Oct 07 01:33:15 laptop kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Oct 07 01:33:15 laptop kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Now, the reason I am reporting this on this bug tracker is that I've bisected this issue (more precisely, the first WARNING right after boot) to the following commit: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.3.y&id=0bd6cb6b58f7332c61cef2e4ae48db1ca9910b6b

In fact, reverting this commit on the latest stable 5.3.6 release apparently stops these WARNINGs/BUGs from happening. However, I don't quite get why they're happening, so I don't know whether reverting is a suitable fix.