I upgraded to linux-image-5.7.0-0.bpo.2-amd64 from buster-backports, and observed another crash:
[164111.200474] general protection fault, probably for non-canonical address 0x72f851fc45fa91dd: 0000 [#1] SMP NOPTI [164111.210876] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-0.bpo.2-amd64 #1 Debian 5.7.10-1~bpo10+1 [164111.220169] Hardware name: PC Engines apu3/apu3, BIOS v4.12.0.2 06/28/2020 [164111.227268] RIP: 0010:kmem_cache_alloc+0x74/0x220 [164111.232168] Code: 9e 01 00 00 4d 8b 06 65 49 8b 50 08 65 4c 03 05 aa 1e 7a 44 49 8b 28 48 85 ed 0f 84 89 01 00 00 41 8b 46 20 49 8b 3e 48 01 e8 <48> 8b 18 48 89 c1 49 33 9e 70 01 00 00 48 89 e8 48 0f c9 48 31 cb [164111.251087] RSP: 0018:ffffba90800c8e10 EFLAGS: 00010206 [164111.256500] RAX: 72f851fc45fa91dd RBX: 0000000000000000 RCX: 0000000000007fdb [164111.263808] RDX: 0000000003eddd90 RSI: 0000000000000a20 RDI: 0000000000032a90 [164111.271103] RBP: 72f851fc45fa916d R08: ffff8dc32acb2a90 R09: ffff8dc324e75000 [164111.278401] R10: ffff8dc235478040 R11: 0000000000000000 R12: 0000000000000a20 [164111.285705] R13: ffffffffbbc4c2cd R14: ffff8dc307d66a80 R15: ffff8dc307d66a80 [164111.293122] FS: 0000000000000000(0000) GS:ffff8dc32ac80000(0000) knlGS:0000000000000000 [164111.301431] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [164111.307357] CR2: 00007ffdf448cb38 CR3: 0000000035722000 CR4: 00000000000406e0 [164111.307939] ------------[ cut here ]------------ [164111.314702] Call Trace: [164111.314719] <IRQ> [164111.314791] __build_skb+0x1d/0x50 [164111.314801] __netdev_alloc_skb+0xbd/0x150 [164111.314829] cdc_mbim_rx_fixup+0x1e2/0x578 [cdc_mbim] [164111.314856] ? usbnet_update_max_qlen+0x8/0x70 [usbnet] [164111.314875] usbnet_bh+0xd8/0x2c0 [usbnet] [164111.319750] VFS: brelse: Trying to free free buffer [164111.322356] tasklet_action_common.isra.20+0x5a/0x100 [164111.324890] WARNING: CPU: 3 PID: 7662 at fs/buffer.c:1179 __brelse+0x1d/0x20 [164111.328049] __do_softirq+0xdf/0x2e5 [164111.328267] ------------[ cut here ]------------ [164111.328279] kernel BUG at fs/ext4/inode.c:1717! [164111.332223] Modules linked in: xt_nat xt_tcpudp nft_compat veth nft_counter xt_conntrack bridge nf_conntrack_netlink xfrm_user xfrm_algo overlay cdc_mbim cdc_wdm cdc_ncm 8021q garp stp mrp llc amd64_edac_mod edac_mce_amd cdc_ether option usbnet mii kvm_amd usb_wwan usbserial kvm irqbypass crc32_pclmul ghash_clmulni_intel aesni_intel libaes crypto_simd cryptd glue_helper k10temp evdev pcspkr sp5100_tco fam15h_power sg ccp watchdog rng_core nft_reject_inet nf_reject_ipv4 leds_gpio nf_reject_ipv6 button nft_reject acpi_cpufreq nft_ct nft_masq nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 sch_fq_codel nf_tables nfnetlink ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 dm_mod raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sd_mod t10_pi crc_t10dif crct10dif_generic ahci libahci xhci_pci ehci_pci libata xhci_hcd ehci_hcd sdhci_pci cqhci sdhci crct10dif_pclmul crct10dif_common [164111.332483] usbcore [164111.337503] ? ioapic_ack_level+0x6d/0x150 [164111.342832] igb scsi_mod mmc_core crc32c_intel i2c_piix4 i2c_algo_bit dca ptp usb_common pps_core gpio_keys [164111.347112] irq_exit+0xa3/0xb0 [164111.352136] CPU: 3 PID: 7662 Comm: https-jsse-nio- Not tainted 5.7.0-0.bpo.2-amd64 #1 Debian 5.7.10-1~bpo10+1 [164111.357388] do_IRQ+0x56/0xe0 [164111.364586] Hardware name: PC Engines apu3/apu3, BIOS v4.12.0.2 06/28/2020 [164111.368361] common_interrupt+0xf/0xf [164111.373144] RIP: 0010:__brelse+0x1d/0x20 [164111.377859] </IRQ> [164111.466113] Code: 00 00 e8 46 ff ff ff 31 c0 c3 0f 1f 00 0f 1f 44 00 00 8b 47 60 85 c0 74 05 f0 ff 4f 60 c3 48 c7 c7 a0 35 50 bc e8 7e 20 da ff <0f> 0b c3 0f 1f 44 00 00 55 53 48 c7 c3 80 a8 02 00 65 48 03 1d b2 [164111.468475] RIP: 0010:cpuidle_enter_state+0xbe/0x3f0 [164111.472692] RSP: 0018:ffffba90862779d8 EFLAGS: 00010286 [164111.482731] Code: e8 c7 93 a9 ff 80 7c 24 13 00 74 17 9c 58 0f 1f 44 00 00 f6 c4 02 0f 85 d5 02 00 00 31 ff e8 79 ec af ff fb 66 0f 1f 44 00 00 <85> ed 0f 88 42 02 00 00 48 63 c5 4c 8b 3c 24 4c 2b 7c 24 08 48 8d [164111.486012] RAX: 0000000000000000 RBX: ffff8dc3259e1f70 RCX: 0000000000000000 [164111.496133] RSP: 0018:ffffba9080083e70 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffdc [164111.499244] RDX: ffff8dc32ada9900 RSI: ffff8dc32ad99ac8 RDI: ffff8dc32ad99ac8 [164111.506305] RAX: ffff8dc32acacc00 RBX: ffff8dc323738800 RCX: 000000000000001f [164111.510129] RBP: 000000000002a880 R08: 000094ff583d7fa5 R09: 0000000000000003 [164111.514191] RDX: 000095421dc88d10 RSI: 00000000803d74ed RDI: 0000000000000000 [164111.516440] R10: 0000000000000000 R11: ffffba9086277880 R12: ffff8dc3259e1f70 [164111.535443] RBP: 0000000000000002 R08: 0000000000000002 R09: 000000000002c480 [164111.540613] R13: ffff8dc324aa2700 R14: 000000000018247e R15: ffff8dc324aa27d8 [164111.546014] R10: 000094ff50d81191 R11: 0000000000000000 R12: ffffffffbc6c8420 [164111.564982] FS: 00007f72bc515700(0000) GS:ffff8dc32ad80000(0000) knlGS:0000000000000000 [164111.572322] R13: ffffffffbc6c8508 R14: 0000000000000002 R15: 0000000000000002 [164111.580105] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [164111.587485] cpuidle_enter+0x29/0x40 [164111.594753] CR2: 00007f735b345ed8 CR3: 000000010c212000 CR4: 00000000000406e0 [164111.602099] do_idle+0x23b/0x280 [164111.609383] Call Trace: [164111.616758] cpu_startup_entry+0x19/0x20 [164111.624098] __find_get_block+0x265/0x2d0 [164111.631434] start_secondary+0x169/0x1c0 [164111.638731] __getblk_gfp+0x24/0x280 [164111.647006] secondary_startup_64+0xa4/0xb0 [164111.654313] ? check_preempt_wakeup+0x18d/0x230 [164111.660200] Modules linked in: xt_nat xt_tcpudp nft_compat veth nft_counter xt_conntrack bridge nf_conntrack_netlink xfrm_user xfrm_algo overlay cdc_mbim cdc_wdm cdc_ncm 8021q garp stp mrp llc amd64_edac_mod edac_mce_amd cdc_ether option usbnet mii kvm_amd usb_wwan usbserial kvm irqbypass crc32_pclmul ghash_clmulni_intel aesni_intel libaes crypto_simd cryptd glue_helper k10temp evdev pcspkr sp5100_tco fam15h_power sg ccp watchdog rng_core nft_reject_inet nf_reject_ipv4 leds_gpio nf_reject_ipv6 button nft_reject acpi_cpufreq nft_ct nft_masq nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 sch_fq_codel nf_tables nfnetlink ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 dm_mod raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sd_mod t10_pi crc_t10dif crct10dif_generic ahci libahci xhci_pci ehci_pci libata xhci_hcd ehci_hcd sdhci_pci cqhci sdhci crct10dif_pclmul crct10dif_common [164111.660467] usbcore [164111.664147] ext4_getblk+0x7f/0x1a0 [ext4] [164111.671266] igb scsi_mod mmc_core crc32c_intel i2c_piix4 i2c_algo_bit dca ptp usb_common pps_core gpio_keys [164111.674894] ext4_bread_batch+0x50/0x180 [ext4] [164111.677311] invalid opcode: 0000 [#2] SMP NOPTI [164111.677738] ---[ end trace 85dd78ad1fa636e3 ]--- [164111.677787] RIP: 0010:kmem_cache_alloc+0x74/0x220 [164111.677813] Code: 9e 01 00 00 4d 8b 06 65 49 8b 50 08 65 4c 03 05 aa 1e 7a 44 49 8b 28 48 85 ed 0f 84 89 01 00 00 41 8b 46 20 49 8b 3e 48 01 e8 <48> 8b 18 48 89 c1 49 33 9e 70 01 00 00 48 89 e8 48 0f c9 48 31 cb [164111.677824] RSP: 0018:ffffba90800c8e10 EFLAGS: 00010206 [164111.677838] RAX: 72f851fc45fa91dd RBX: 0000000000000000 RCX: 0000000000007fdb [164111.677849] RDX: 0000000003eddd90 RSI: 0000000000000a20 RDI: 0000000000032a90 [164111.677860] RBP: 72f851fc45fa916d R08: ffff8dc32acb2a90 R09: ffff8dc324e75000 [164111.677873] R10: ffff8dc235478040 R11: 0000000000000000 R12: 0000000000000a20 [164111.677882] R13: ffffffffbbc4c2cd R14: ffff8dc307d66a80 R15: ffff8dc307d66a80 [164111.677895] FS: 0000000000000000(0000) GS:ffff8dc32ac80000(0000) knlGS:0000000000000000 [164111.677905] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [164111.677916] CR2: 00007ffdf448cb38 CR3: 0000000035722000 CR4: 00000000000406e0 [164111.677930] Kernel panic - not syncing: Fatal exception in interrupt [164111.681419] __ext4_find_entry+0x16b/0x430 [ext4] [164111.685396] CPU: 0 PID: 247 Comm: systemd-journal Tainted: G D 5.7.0-0.bpo.2-amd64 #1 Debian 5.7.10-1~bpo10+1 [164111.689412] ? __switch_to_xtra+0x31b/0x510 [164111.693093] Hardware name: PC Engines apu3/apu3, BIOS v4.12.0.2 06/28/2020 [164111.697376] ? __switch_to_asm+0x34/0x70 [164111.702079] RIP: 0010:ext4_da_get_block_prep+0x3f8/0x400 [ext4] [164111.789632] ext4_lookup+0x85/0x1f0 [ext4] [164111.791835] Code: 58 52 c0 4d 8b 44 24 40 ba e3 06 00 00 48 c7 c6 00 e3 51 c0 e8 69 3a 03 00 0f 0b 8b 54 24 14 58 e9 9c fe ff ff e8 48 6f 1a fb <0f> 0b 66 0f 1f 44 00 00 0f 1f 44 00 00 f6 87 6a ff ff ff 20 75 6f [164111.796039] __lookup_hash+0x71/0xa0 [164111.805966] RSP: 0000:ffffba908016fc48 EFLAGS: 00010246 [164111.810600] ? _cond_resched+0x15/0x30 [164111.815211] RAX: 0000000000000001 RBX: ffff8dc2c69525b0 RCX: 0000000000000000 [164111.815218] RDX: 0000000000000000 RSI: 00000000000009f3 RDI: ffff8dc32254d418 [164111.819931] do_unlinkat+0x152/0x300 [164111.824720] RBP: 0000000000000001 R08: ffffda907fc164a0 R09: 0000000000000000 [164111.824728] R10: 0000000000000200 R11: ffff8dc2c69525b0 R12: ffff8dc323aa4d68 [164111.843596] do_coredump+0xdcd/0x112a [164111.848908] R13: 00000000000009f3 R14: ffffffffffff0000 R15: 0000000000001000 [164111.848916] FS: 00007f489a5d4940(0000) GS:ffff8dc32ac00000(0000) knlGS:0000000000000000 [164111.856160] ? __switch_to_asm+0x34/0x70 [164111.863381] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [164111.863387] CR2: 00007f489a1c7000 CR3: 0000000124612000 CR4: 00000000000406f0 [164111.870624] ? __schedule+0x2e5/0x710 [164111.877837] Call Trace: [164111.885086] get_signal+0x141/0x860 [164111.893269] __block_write_begin_int+0x133/0x600 [164111.899097] do_signal+0x30/0x820 [164111.906391] ? ext4_da_reserve_space+0x110/0x110 [ext4] [164111.912781] ? signal_wake_up_state+0x15/0x30 [164111.917648] ? ext4_da_reserve_space+0x110/0x110 [ext4] [164111.928884] ? __send_signal+0x1e2/0x3e0 [164111.933198] block_page_mkwrite+0xa1/0xf0 [164111.940163] ? force_sig_info_to_task+0xb9/0xd0 [164111.944256] ext4_page_mkwrite+0x295/0x430 [ext4] [164111.950212] exit_to_usermode_loop+0x89/0xf0 [164111.954425] do_page_mkwrite+0x51/0xb0 [164111.973272] prepare_exit_to_usermode+0x76/0x90 [164111.976946] __handle_mm_fault+0xe51/0x13e0 [164111.982275] ret_from_intr+0x25/0x25 [164111.986120] handle_mm_fault+0xc2/0x1f0 [164111.993345] RIP: 0033:0x7f7359f50fbd [164112.000572] do_page_fault+0x260/0x5d0 [164112.004254] Code: 4d 85 e4 0f 95 85 d8 fe ff ff 0f b6 08 84 c9 0f 84 68 01 00 00 4d 85 ff 88 8d d7 fe ff ff 0f 84 f9 01 00 00 49 8b 07 4c 89 ff <ff> 50 28 84 c0 0f 84 b8 01 00 00 4d 85 ed 0f 95 c0 22 85 d8 fe ff [164112.011479] page_fault+0x34/0x40 [164112.018698] RSP: 002b:00007f72bc514060 EFLAGS: 00010206 [164112.022462] RIP: 0033:0x7f489b77aad2 [164112.029687] RAX: 0000000000000000 RBX: 000000000000000b RCX: 0000000000000001 [164112.029694] RDX: 00007f72bc515a20 RSI: 00007f7354811800 RDI: 00007f7354811800 [164112.037907] Code: 00 00 00 f3 41 0f 7f 00 77 4e 48 83 fa 40 72 2a 0f 28 26 0f 28 4e 10 0f 28 56 20 0f 28 5e 30 0f 29 27 0f 29 4f 10 0f 29 57 20 <0f> 29 5f 30 48 83 ea 40 48 83 c6 40 48 83 c7 40 48 01 d6 48 01 d7 [164112.041924] RBP: 00007f72bc5141b0 R08: 0000000000000000 R09: 00000000022e6302 [164112.041930] R10: 00000000000003e8 R11: 0000000000000000 R12: 00007f72bc514200 [164112.047773] RSP: 002b:00007ffd692367b8 EFLAGS: 00010206 [164112.054993] R13: 00007f72bc514330 R14: 0000000000000001 R15: 00007f7354811800 [164112.055003] ---[ end trace 85dd78ad1fa636e4 ]--- [164112.058748] RAX: 00007f489a1c6fb0 RBX: 0000000000000090 RCX: 0000000000100000 [164112.241152] RDX: 0000000000000070 RSI: 00007ffd69236890 RDI: 00007f489a1c6fd0 [164112.248373] RBP: 0000560b84e8c520 R08: 00007f489a1c6fb0 R09: 0000000000000000 [164112.255599] R10: 00000000022e64e8 R11: 00007f489b7cb4a0 R12: 0000000000000000 [164112.262828] R13: 56b2df37430ecceb R14: 00007ffd692395f0 R15: 00007ffd69236a30 [164112.270053] Modules linked in: xt_nat xt_tcpudp nft_compat veth nft_counter xt_conntrack bridge nf_conntrack_netlink xfrm_user xfrm_algo overlay cdc_mbim cdc_wdm cdc_ncm 8021q garp stp mrp llc amd64_edac_mod edac_mce_amd cdc_ether option usbnet mii kvm_amd usb_wwan usbserial kvm irqbypass crc32_pclmul ghash_clmulni_intel aesni_intel libaes crypto_simd cryptd glue_helper k10temp evdev pcspkr sp5100_tco fam15h_power sg ccp watchdog rng_core nft_reject_inet nf_reject_ipv4 leds_gpio nf_reject_ipv6 button nft_reject acpi_cpufreq nft_ct nft_masq nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 sch_fq_codel nf_tables nfnetlink ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 dm_mod raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sd_mod t10_pi crc_t10dif crct10dif_generic ahci libahci xhci_pci ehci_pci libata xhci_hcd ehci_hcd sdhci_pci cqhci sdhci crct10dif_pclmul crct10dif_common [164112.270222] usbcore igb scsi_mod mmc_core crc32c_intel i2c_piix4 i2c_algo_bit dca ptp usb_common pps_core gpio_keys [164112.368364] Kernel Offset: 0x3a600000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)