I got this kernel panic earlier today. It appears to be related to dm-thin. In case it matters, I have a bunch of VMs that use mounts with the 'discard' option set, so there was likely a LOT of discard activity. I worked around the problem by disabling the feature with lvchange, but it obviously should still be fixed. Panic message and stack trace attached. -- Sincerely, Demi Marie Obenour (she/her/hers) Invisible Things Lab
<1>[13053.503343] BUG: kernel NULL pointer dereference, address: 0000000000000014 <1>[13053.503353] #PF: supervisor read access in kernel mode <1>[13053.503357] #PF: error_code(0x0000) - not-present page <6>[13053.503362] PGD 0 P4D 0 <4>[13053.503365] Oops: 0000 [#1] SMP NOPTI <4>[13053.503370] CPU: 3 PID: 50805 Comm: kworker/u8:3 Tainted: G W 5.15.52-1.fc32.qubes.x86_64 #1 <4>[13053.503377] Hardware name: LENOVO 20HHCTO1WW/20HHCTO1WW, BIOS N1UET43W (1.17 ) 12/13/2017 <4>[13053.503383] Workqueue: dm-thin do_worker [dm_thin_pool] <4>[13053.503392] RIP: e030:__blkdev_issue_discard+0x165/0x2a0 <4>[13053.503400] Code: 14 48 c7 c2 e0 d8 66 83 31 f6 e8 e6 1e ff ff 49 89 c6 4d 85 ff 74 13 4c 89 ff 48 89 c6 e8 f3 03 ff ff 4c 89 ff e8 ab 75 ff ff <41> 0f b7 46 14 4d 89 66 20 89 c1 80 e5 f7 66 41 89 4e 14 4d 39 6e <4>[13053.503412] RSP: e02b:ffffc90042e2fb40 EFLAGS: 00010246 <4>[13053.503416] RAX: 0000000000000000 RBX: 0000000000000200 RCX: 00000000000000c8 <4>[13053.503422] RDX: 0000000000000001 RSI: 0000000000000200 RDI: ffffffff8366d8f8 <4>[13053.503427] RBP: 0000000000000200 R08: 0000000000000200 R09: 000000000000073c <4>[13053.503434] R10: ffffffff812a97e8 R11: 000000000000000b R12: 000000002c7de000 <4>[13053.503439] R13: ffff888004482580 R14: 0000000000000000 R15: 0000000000000000 <4>[13053.503450] FS: 0000000000000000(0000) GS:ffff88807d380000(0000) knlGS:0000000000000000 <4>[13053.503456] CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033 <4>[13053.503460] CR2: 0000000000000014 CR3: 00000000146a2000 CR4: 0000000000050660 <4>[13053.503469] Call Trace: <4>[13053.503472] <TASK> <4>[13053.503476] passdown_double_checking_shared_status.constprop.0+0x11b/0x140 [dm_thin_pool] <4>[13053.503485] process_prepared_discard_passdown_pt1+0xc4/0x190 [dm_thin_pool] <4>[13053.503494] break_up_discard_bio+0x152/0x270 [dm_thin_pool] <4>[13053.503501] process_discard_cell_passdown+0x37/0x50 [dm_thin_pool] <4>[13053.503508] process_discard_bio+0xf3/0x160 [dm_thin_pool] <4>[13053.503514] process_thin_deferred_bios+0x15d/0x240 [dm_thin_pool] <4>[13053.503522] process_deferred_bios+0x2d/0x1d0 [dm_thin_pool] <4>[13053.503529] do_worker+0xcc/0x130 [dm_thin_pool] <4>[13053.503535] process_one_work+0x1f1/0x390 <4>[13053.503540] worker_thread+0x4c/0x310 <4>[13053.503543] ? process_one_work+0x390/0x390 <4>[13053.503547] kthread+0x127/0x150 <4>[13053.503552] ? set_kthread_struct+0x40/0x40 <4>[13053.503557] ret_from_fork+0x22/0x30 <4>[13053.503563] </TASK> <4>[13053.503565] Modules linked in: loop intel_rapl_msr ee1004 iTCO_wdt intel_pmc_bxt mei_hdcp iTCO_vendor_support intel_rapl_common snd_hda_codec_hdmi intel_powerclamp snd_ctl_led snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec snd_hda_core snd_hwdep snd_seq pcspkr joydev snd_seq_device think_lmi intel_wmi_thunderbolt firmware_attributes_class wmi_bmof snd_pcm i2c_i801 i2c_smbus vfat thinkpad_acpi fat mei_me platform_profile mei snd_timer ledtrig_audio idma64 rfkill intel_pch_thermal snd soundcore xenfs fuse ip_tables dm_thin_pool dm_persistent_data dm_bio_prison dm_crypt trusted asn1_encoder crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel serio_raw i915 nouveau nvme drm_ttm_helper mxm_wmi i2c_algo_bit ttm drm_kms_helper nvme_core cec drm wmi i2c_hid_acpi video i2c_hid pinctrl_sunrisepoint xen_acpi_processor xen_privcmd xen_pciback xen_blkback xen_gntalloc xen_gntdev xen_evtchn <4>[13053.503645] CR2: 0000000000000014 <4>[13053.503649] ---[ end trace f86fa19611542bfa ]--- <4>[13053.772527] RIP: e030:__blkdev_issue_discard+0x165/0x2a0 <4>[13053.772545] Code: 14 48 c7 c2 e0 d8 66 83 31 f6 e8 e6 1e ff ff 49 89 c6 4d 85 ff 74 13 4c 89 ff 48 89 c6 e8 f3 03 ff ff 4c 89 ff e8 ab 75 ff ff <41> 0f b7 46 14 4d 89 66 20 89 c1 80 e5 f7 66 41 89 4e 14 4d 39 6e <4>[13053.772556] RSP: e02b:ffffc90042e2fb40 EFLAGS: 00010246 <4>[13053.772561] RAX: 0000000000000000 RBX: 0000000000000200 RCX: 00000000000000c8 <4>[13053.772567] RDX: 0000000000000001 RSI: 0000000000000200 RDI: ffffffff8366d8f8 <4>[13053.772572] RBP: 0000000000000200 R08: 0000000000000200 R09: 000000000000073c <4>[13053.772577] R10: ffffffff812a97e8 R11: 000000000000000b R12: 000000002c7de000 <4>[13053.772582] R13: ffff888004482580 R14: 0000000000000000 R15: 0000000000000000 <4>[13053.772593] FS: 0000000000000000(0000) GS:ffff88807d380000(0000) knlGS:0000000000000000 <4>[13053.772599] CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033 <4>[13053.772604] CR2: 0000000000000014 CR3: 00000000146a2000 CR4: 0000000000050660 <0>[13053.772625] Kernel panic - not syncing: Fatal exception <0>[13053.772635] Kernel Offset: disabled
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