Also seeing this on AWS with t4g instances. Kernel panic: [ 12.489272] kernel BUG at include/linux/fs.h:3104! [ 12.490111] Internal error: Oops - BUG: 0 [#1] SMP [ 12.490923] Modules linked in: veth xt_nat xt_tcpudp xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c bpfilter br_netfilter bridge stp llc aufs overlay nls_iso8859_1 dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua aes_ce_blk crypto_simd cryptd aes_ce_cipher crct10dif_ce ghash_ce sha2_ce sha256_arm64 sha1_ce efi_pstore ena sch_fq_codel ipmi_devintf ipmi_msghandler drm ip_tables x_tables autofs4 [ 12.498762] CPU: 0 PID: 1349 Comm: id Not tainted 5.13.0-1028-aws #31~20.04.1-Ubuntu [ 12.500092] Hardware name: Amazon EC2 t4g.micro/, BIOS 1.0 11/1/2018 [ 12.501189] pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--) [ 12.502226] pc : __fput+0x240/0x248 [ 12.502844] lr : __fput+0xb0/0x248 [ 12.503451] sp : ffff80000a11baf0 [ 12.504039] x29: ffff80000a11baf0 x28: ffff000003de6c80 x27: 0000000000000000 [ 12.505287] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000 [ 12.506513] x23: ffff00000447ef00 x22: ffff00000ae0ca20 x21: 00000000000a801d [ 12.507746] x20: ffff000001ce6020 x19: ffff000002df7500 x18: 0000000000000000 [ 12.508972] x17: 0000000000000000 x16: ffffcab3b1ed6968 x15: 0000000000000000 [ 12.510189] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 [ 12.511411] x11: 0000000000000000 x10: 0000000000000001 x9 : ffffcab3b1ed6298 [ 12.512650] x8 : ffff00003e40b0c0 x7 : 0000000000000808 x6 : 0000000300000000 [ 12.513873] x5 : ffff000001ce6020 x4 : 0000000000008000 x3 : ffff000000f98800 [ 12.515101] x2 : ffffffffffffffff x1 : 0000000000000000 x0 : 0000000000000000 [ 12.516333] Call trace: [ 12.516771] __fput+0x240/0x248 [ 12.517327] ____fput+0x18/0x28 [ 12.517886] task_work_run+0xc8/0x140 [ 12.518541] do_exit+0x20c/0x8e0 [ 12.519118] do_group_exit+0x4c/0xb0 [ 12.519753] __wake_up_parent+0x0/0x38 [ 12.520437] invoke_syscall+0x74/0xf0 [ 12.521085] el0_svc_common.constprop.0+0x184/0x1a8 [ 12.521939] do_el0_svc+0x2c/0x90 [ 12.522608] el0_svc+0x24/0x38 [ 12.523155] el0_sync_handler+0xb0/0xb8 [ 12.523834] el0_sync+0x19c/0x1c0 [ 12.524426] Code: 91059283 52800020 1400016f 17ffffa0 (d4210000) [ 12.525503] ---[ end trace 8bd8624b9b8b9618 ]--- [ 12.531116] Fixing recursive fault but reboot is needed! [ 12.537950] ------------[ cut here ]------------ [ 12.538742] WARNING: CPU: 0 PID: 0 at kernel/rcu/tree.c:638 rcu_eqs_enter.isra.0+0x68/0x70 [ 12.540129] Modules linked in: veth xt_nat xt_tcpudp xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c bpfilter br_netfilter bridge stp llc aufs overlay nls_iso8859_1 dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua aes_ce_blk crypto_simd cryptd aes_ce_cipher crct10dif_ce ghash_ce sha2_ce sha256_arm64 sha1_ce efi_pstore ena sch_fq_codel ipmi_devintf ipmi_msghandler drm ip_tables x_tables autofs4 [ 12.547909] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G D 5.13.0-1028-aws #31~20.04.1-Ubuntu [ 12.549548] Hardware name: Amazon EC2 t4g.micro/, BIOS 1.0 11/1/2018 [ 12.550649] pstate: 204000c5 (nzCv daIF +PAN -UAO -TCO BTYPE=--) [ 12.551689] pc : rcu_eqs_enter.isra.0+0x68/0x70 [ 12.552484] lr : rcu_idle_enter+0x18/0x28 [ 12.553209] sp : ffffcab3b3f33e80 [ 12.553797] x29: ffffcab3b3f33e80 x28: 0000000064c94404 x27: ffffcab3b3f48040 [ 12.555032] x26: 0000000000000000 x25: 0000000000000000 x24: ffffcab3b3f3db6c [ 12.556266] x23: ffffcab3b3f48040 x22: ffffcab3b397e478 x21: ffffcab3b3f3db2c [ 12.557509] x20: ffffcab3b3f3da20 x19: ffffcab3b3969008 x18: 0000000000000000 [ 12.558765] x17: 0000000000000000 x16: 0000000000000000 x15: 0000ffff83bcb658 [ 12.560008] x14: 0000000000000000 x13: 0000000000000000 x12: ffffcab3b2f91468 [ 12.561243] x11: ffffcab3b3f3db58 x10: 0000000000000b10 x9 : ffffcab3b2a82160 [ 12.562484] x8 : ffffcab3b3f48bb0 x7 : 00000000000002ca x6 : 000000007c5faadb [ 12.563738] x5 : 00ffffffffffffff x4 : ffff354c8aa48000 x3 : ffff354c8aa48000 [ 12.564977] x2 : 4000000000000002 x1 : 4000000000000000 x0 : ffff00003e3c8b00 [ 12.566210] Call trace: [ 12.566650] rcu_eqs_enter.isra.0+0x68/0x70 [ 12.567384] rcu_idle_enter+0x18/0x28 [ 12.568032] default_idle_call+0x40/0x170 [ 12.568738] do_idle+0x22c/0x280 [ 12.569309] cpu_startup_entry+0x30/0x98 [ 12.569994] rest_init+0xc8/0xd8 [ 12.570563] arch_call_rest_init+0x18/0x24 [ 12.571288] start_kernel+0x700/0x740 [ 12.571949] ---[ end trace 8bd8624b9b8b9619 ]--- [ 12.762479] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000018 [ 12.763998] Mem abort info: [ 12.764443] ESR = 0x96000004 [ 12.764955] EC = 0x25: DABT (current EL), IL = 32 bits [ 12.765903] SET = 0, FnV = 0 [ 12.766397] EA = 0, S1PTW = 0 [ 12.766881] Data abort info: [ 12.767338] ISV = 0, ISS = 0x00000004 [ 12.767938] CM = 0, WnR = 0 [ 12.768421] user pgtable: 4k pages, 48-bit VAs, pgdp=000000004a694000 [ 12.769533] [0000000000000018] pgd=0000000000000000, p4d=0000000000000000 [ 12.770563] Internal error: Oops: 96000004 [#2] SMP [ 12.771322] Modules linked in: veth xt_nat xt_tcpudp xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c bpfilter br_netfilter bridge stp llc aufs overlay nls_iso8859_1 dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua aes_ce_blk crypto_simd cryptd aes_ce_cipher crct10dif_ce ghash_ce sha2_ce sha256_arm64 sha1_ce efi_pstore ena sch_fq_codel ipmi_devintf ipmi_msghandler drm ip_tables x_tables autofs4 [ 12.778542] CPU: 1 PID: 1329 Comm: journalctl Tainted: G D W 5.13.0-1028-aws #31~20.04.1-Ubuntu [ 12.780158] Hardware name: Amazon EC2 t4g.micro/, BIOS 1.0 11/1/2018 [ 12.781200] pstate: 80400005 (Nzcv daif +PAN -UAO -TCO BTYPE=--) [ 12.782157] pc : __handle_mm_fault+0x6c/0x510 [ 12.782854] lr : handle_mm_fault+0xcc/0x258 [ 12.783515] sp : ffff800008a0bcc0 [ 12.784069] x29: ffff800008a0bcc0 x28: ffff00000384ae80 x27: 0000000000000007 [ 12.785185] x26: ffff00001c2fa5e8 x25: 0000000000000254 x24: ffff00000ad31820 [ 12.786330] x23: 0000000000000040 x22: 0000000000000254 x21: ffff00000384ae80 [ 12.787500] x20: 0000ffff7a6cc000 x19: ffff00000ad31820 x18: 0000000000000000 [ 12.788651] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 [ 12.789797] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 [ 12.790956] x11: 0000000000000000 x10: 0000000000000000 x9 : ffffcab3b1e380d4 [ 12.792176] x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffff354c8aa6a000 [ 12.793377] x5 : ffff800008a0bd70 x4 : 0000000000000285 x3 : ffff000002df7000 [ 12.794598] x2 : 0000000000000254 x1 : 0000ffff7a6cc000 x0 : 0000000000000000 [ 12.795810] Call trace: [ 12.796231] __handle_mm_fault+0x6c/0x510 [ 12.796921] handle_mm_fault+0xcc/0x258 [ 12.797578] do_page_fault+0x170/0x4b8 [ 12.798213] do_translation_fault+0x68/0x78 [ 12.798887] do_mem_abort+0x48/0xb8 [ 12.799461] el0_da+0x40/0x80 [ 12.799958] el0_sync_handler+0x88/0xb8 [ 12.800590] el0_sync+0x19c/0x1c0 [ 12.801131] Code: a909ffff a90affff b4000083 f9406c60 (b9401800) [ 12.802101] ---[ end trace 8bd8624b9b8b961a ]--- [ 12.819021] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000030 [ 12.820378] Mem abort info: [ 12.820794] ESR = 0x96000006 [ 12.821297] EC = 0x25: DABT (current EL), IL = 32 bits [ 12.822110] SET = 0, FnV = 0 [ 12.822595] EA = 0, S1PTW = 0 [ 12.823098] Data abort info: [ 12.823535] ISV = 0, ISS = 0x00000006 [ 12.824134] CM = 0, WnR = 0 [ 12.824615] user pgtable: 4k pages, 48-bit VAs, pgdp=00000000425ec000 [ 12.825628] [0000000000000030] pgd=080000005cb23003, p4d=080000005cb23003, pud=080000005c8c0003, pmd=0000000000000000 [ 12.827234] Internal error: Oops: 96000006 [#3] SMP [ 12.827983] Modules linked in: veth xt_nat xt_tcpudp xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c bpfilter br_netfilter bridge stp llc aufs overlay nls_iso8859_1 dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua aes_ce_blk crypto_simd cryptd aes_ce_cipher crct10dif_ce ghash_ce sha2_ce sha256_arm64 sha1_ce efi_pstore ena sch_fq_codel ipmi_devintf ipmi_msghandler drm ip_tables x_tables autofs4 [ 12.834966] CPU: 0 PID: 1329 Comm: journalctl Tainted: G D W 5.13.0-1028-aws #31~20.04.1-Ubuntu [ 12.836476] Hardware name: Amazon EC2 t4g.micro/, BIOS 1.0 11/1/2018 [ 12.837477] pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--) [ 12.838425] pc : down_write+0x38/0x88 [ 12.839038] lr : down_write+0x20/0x88 [ 12.839628] sp : ffff800008a0b710 [ 12.840179] x29: ffff800008a0b710 x28: ffff00000384ae80 x27: 0000000000000007 [ 12.841317] x26: ffff00001c2fa5e8 x25: 0000000000000000 x24: 0000000000000000 [ 12.842466] x23: ffff800008a0b7e8 x22: 0000000000000000 x21: 0000000000000030 [ 12.843594] x20: ffff000002df7000 x19: 0000000000000030 x18: 0000000000000000 [ 12.844722] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 [ 12.845802] x14: 0000000000000000 x13: 0000000000000000 x12: ffffcab3b2f91468 [ 12.846891] x11: ffffcab3b3f3db58 x10: 0000000000000000 x9 : ffffcab3b2a7a814 [ 12.847997] x8 : 0000000000001b80 x7 : 0000000000000005 x6 : 0000ffff92481000 [ 12.849070] x5 : 0000000000000000 x4 : 0000ffff7a481000 x3 : 0000000000000000 [ 12.850165] x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000030 [ 12.851268] Call trace: [ 12.851649] down_write+0x38/0x88 [ 12.852152] unlink_file_vma+0x38/0x68 [ 12.852747] free_pgtables+0xc0/0x138 [ 12.853306] exit_mmap+0xe4/0x1c0 [ 12.853825] mmput+0x90/0x1a8 [ 12.854308] exit_mm+0x19c/0x250 [ 12.854798] do_exit+0x198/0x8e0 [ 12.855306] die+0x2e8/0x2f8 [ 12.855771] die_kernel_fault+0x6c/0x80 [ 12.856374] __do_kernel_fault+0xbc/0x1e8 [ 12.856990] do_page_fault+0x208/0x4b8 [ 12.857596] do_translation_fault+0x68/0x78 [ 12.858281] do_mem_abort+0x48/0xb8 [ 12.858846] el1_abort+0x5c/0xe0 [ 12.859371] el1_sync_handler+0xac/0xc8 [ 12.859993] el1_sync+0x7c/0x100 [ 12.860529] __handle_mm_fault+0x6c/0x510 [ 12.861187] handle_mm_fault+0xcc/0x258 [ 12.861926] do_page_fault+0x170/0x4b8 [ 12.862541] do_translation_fault+0x68/0x78 [ 12.863226] do_mem_abort+0x48/0xb8 [ 12.863787] el0_da+0x40/0x80 [ 12.864267] el0_sync_handler+0x88/0xb8 [ 12.864896] el0_sync+0x19c/0x1c0 [ 12.865427] Code: d2800001 aa1303e0 d2800022 aa0103e3 (c8e37e62) [ 12.866373] ---[ end trace 8bd8624b9b8b961b ]--- [ 12.872885] Fixing recursive fault but reboot is needed! Ubuntu 20.04.4 LTS ip-172-31-44-191 ttyS0 ip-172-31-44-191 login: [ 13.493058] ------------[ cut here ]------------ [ 13.493848] kernel BUG at include/linux/fs.h:3104! [ 13.494605] Internal error: Oops - BUG: 0 [#4] SMP [ 13.495369] Modules linked in: veth xt_nat xt_tcpudp xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c bpfilter br_netfilter bridge stp llc aufs overlay nls_iso8859_1 dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua aes_ce_blk crypto_simd cryptd aes_ce_cipher crct10dif_ce ghash_ce sha2_ce sha256_arm64 sha1_ce efi_pstore ena sch_fq_codel ipmi_devintf ipmi_msghandler drm ip_tables x_tables autofs4 [ 13.502657] CPU: 0 PID: 1405 Comm: bash Tainted: G D W 5.13.0-1028-aws #31~20.04.1-Ubuntu [ 13.504173] Hardware name: Amazon EC2 t4g.micro/, BIOS 1.0 11/1/2018 [ 13.505200] pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--) [ 13.506197] pc : __fput+0x240/0x248 [ 13.506778] lr : __fput+0xb0/0x248 [ 13.507357] sp : ffff80000a1e3c40 [ 13.507916] x29: ffff80000a1e3c40 x28: 0000000000000006 x27: 000000000000f000 [ 13.509079] x26: ffff80000a1e3e70 x25: ffffcab3b3969000 x24: ffffcab3b3969008 [ 13.510229] x23: ffff000004595300 x22: ffff000000447660 x21: 00000000480a801d [ 13.511405] x20: ffff000004972f30 x19: ffff00000636aa00 x18: ffff00003e40b180 [ 13.512564] x17: ffff00003e40b180 x16: fffffc0000711d48 x15: 0000000000000068 [ 13.513741] x14: 00000000000000c0 x13: 0000000000000000 x12: fffffc0000711d08 [ 13.514957] x11: 0000000000000000 x10: 0000000000000001 x9 : ffffcab3b1ed6298 [ 13.516150] x8 : ffff00003e40b0c0 x7 : 0000000000004cf0 x6 : 0000000000019830 [ 13.517349] x5 : ffff000004972f30 x4 : 0000000000008000 x3 : ffff000000c69000 [ 13.518562] x2 : ffffcab3b1fea810 x1 : 0000000000080000 x0 : 0000000000000000 [ 13.519801] Call trace: [ 13.520226] __fput+0x240/0x248 [ 13.520786] ____fput+0x18/0x28 [ 13.521316] task_work_run+0xc8/0x140 [ 13.521928] do_exit+0x20c/0x8e0 [ 13.522459] do_group_exit+0x4c/0xb0 [ 13.523061] get_signal+0x1ac/0x830 [ 13.523669] do_notify_resume+0x2c8/0x850 [ 13.524314] work_pending+0xc/0x244 [ 13.524893] Code: 91059283 52800020 1400016f 17ffffa0 (d4210000) [ 13.525865] ---[ end trace 8bd8624b9b8b961c ]--- [ 13.533116] Fixing recursive fault but reboot is needed! [ 15.124518] loop10: detected capacity change from 0 to 8 2022/06/09 01:48:55Z: Amazon SSM Agent v3.1.1188.0 is running 2022/06/09 01:48:55Z: OsProductName: Ubuntu 2022/06/09 01:48:55Z: OsVersion: 20.04 [ 17.253794] cloud-init[1523]: Cloud-init v. 22.2-0ubuntu1~20.04.1 running 'modules:config' at Thu, 09 Jun 2022 01:48:56 +0000. Up 17.11 seconds. [ 17.774237] cloud-init[1528]: Cloud-init v. 22.2-0ubuntu1~20.04.1 running 'modules:final' at Thu, 09 Jun 2022 01:48:56 +0000. Up 17.64 seconds. [ 17.775169] cloud-init[1528]: Cloud-init v. 22.2-0ubuntu1~20.04.1 finished at Thu, 09 Jun 2022 01:48:56 +0000. Datasource DataSourceEc2Local. Up 17.76 seconds