Severity: serious Justification: kernel panic I experimented a little and disabled cgroupv2 on that server. Because I had some issues during boot I attempted to enable NetworkManager-wait-online.service using systemd, but that instantly resulted in the following kernel panic:
[ 69.485816] ------------[ cut here ]------------ [ 69.490485] WARNING: CPU: 1 PID: 1 at /build/linux-NHzxYj/linux-4.14.7/kernel/fork.c:419 __put_task_struct+0xf0/0x150 [ 69.501108] Modules linked in: binfmt_misc vhost_net vhost tap tun xt_multiport devlink iptable_filter bridge 8021q garp mrp stp llc fuse i915 nls_ascii nls_cp437 vfat fat intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ast ttm hci_uart btqca ghash_clmulni_intel drm_kms_helper btintel intel_cstate intel_uncore bluetooth efi_pstore intel_rapl_perf sg mei_me pcspkr drbg efivars iTCO_wdt joydev ansi_cprng evdev cdc_acm iTCO_vendor_support drm mei shpchp intel_pch_thermal ie31200_edac battery ecdh_generic intel_lpss_acpi rfkill intel_lpss mfd_core video button acpi_als acpi_power_meter acpi_pad kfifo_buf industrialio ipmi_si ipmi_devintf ipmi_msghandler nfsd auth_rpcgss nfs_acl lockd grace sunrpc efivarfs ip_tables x_tables autofs4 ext4 [ 69.571558] crc16 mbcache jbd2 crc32c_generic fscrypto ecb dm_mod ses enclosure sd_mod scsi_transport_sas hid_generic usbhid xhci_pci crc32c_intel xhci_hcd igb ixgbe i2c_algo_bit aesni_intel ahci dca aes_x86_64 libahci usbcore ptp crypto_simd libata cryptd megaraid_sas glue_helper usb_common i2c_i801 pps_core mdio scsi_mod fan thermal i2c_hid hid [ 69.602324] CPU: 1 PID: 1 Comm: systemd Not tainted 4.14.0-2-amd64 #1 Debian 4.14.7-1 [ 69.610168] Hardware name: Supermicro Super Server/X11SSH-F, BIOS 2.0b 07/27/2017 [ 69.617665] task: ffffa0552173a040 task.stack: ffffb46243168000 [ 69.623601] RIP: 0010:__put_task_struct+0xf0/0x150 [ 69.628403] RSP: 0018:ffffb4624316bda0 EFLAGS: 00010246 [ 69.633644] RAX: 0000000000000000 RBX: ffffa054db731410 RCX: 0000000000000001 [ 69.640795] RDX: ffffb4624316be40 RSI: ffffa054db731410 RDI: ffffa054db731410 [ 69.647944] RBP: ffffb4624316bdb0 R08: 0000000000001000 R09: 000000000000000c [ 69.655095] R10: 0000000000000020 R11: ffffa054b84a500b R12: ffffb4624316bf18 [ 69.662244] R13: ffffa0551e7e7a00 R14: ffffa054db731410 R15: ffffa0551d8bcc00 [ 69.669395] FS: 00007f18193e4980(0000) GS:ffffa05545040000(0000) knlGS:0000000000000000 [ 69.677498] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.683260] CR2: 00005582ad204068 CR3: 00000008603ae003 CR4: 00000000003626e0 [ 69.690410] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 69.697561] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 69.704709] Call Trace: [ 69.707166] css_task_iter_next+0x74/0x80 [ 69.711195] cgroup_procs_next+0x16/0x20 [ 69.715130] cgroup_seqfile_next+0x1a/0x20 [ 69.719239] kernfs_seq_next+0x27/0x60 [ 69.722999] seq_read+0x2ce/0x3f0 [ 69.726327] kernfs_fop_read+0x134/0x180 [ 69.730263] ? security_file_permission+0x9b/0xc0 [ 69.734975] __vfs_read+0x18/0x40 [ 69.738295] vfs_read+0x8e/0x130 [ 69.741527] SyS_read+0x55/0xc0 [ 69.744675] system_call_fast_compare_end+0xc/0x97 [ 69.749483] RIP: 0033:0x7f1818d0076d [ 69.753061] RSP: 002b:00007ffc19d1a880 EFLAGS: 00000293 ORIG_RAX: 0000000000000000 [ 69.760644] RAX: ffffffffffffffda RBX: 00005582ad1d9440 RCX: 00007f1818d0076d [ 69.767794] RDX: 0000000000001000 RSI: 00005582ad1f60e0 RDI: 000000000000001d [ 69.774945] RBP: 00007f1818fbc440 R08: 00007f1818fc0188 R09: 0000000000001010 [ 69.782094] R10: 0000000000000020 R11: 0000000000000293 R12: 0000000000000000 [ 69.789669] R13: 0000000000000000 R14: 000000000000001d R15: 00005582ad0a15c0 [ 69.797296] Code: 49 8b 94 24 d8 03 00 00 48 85 d2 74 06 f0 ff 4a 5c 74 2c 48 8b 3d 29 42 e5 00 4c 89 e6 e8 c9 a7 19 00 eb a2 0f ff e9 4a ff ff ff <0f> ff 8b 43 48 85 c0 0f 84 2b ff ff ff 0f ff e9 24 ff ff ff 48 [ 69.817117] ---[ end trace 29e4513e3e583259 ]--- [ 69.822245] BUG: unable to handle kernel NULL pointer dereference at 00000000000000b0 [ 69.830959] IP: pids_free+0x15/0x40 [ 69.834908] PGD 0 P4D 0 [ 69.837873] Oops: 0000 [#1] SMP [ 69.841488] Modules linked in: binfmt_misc vhost_net vhost tap tun xt_multiport devlink iptable_filter bridge 8021q garp mrp stp llc fuse i915 nls_ascii nls_cp437 vfat fat intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ast ttm hci_uart btqca ghash_clmulni_intel drm_kms_helper btintel intel_cstate intel_uncore bluetooth efi_pstore intel_rapl_perf sg mei_me pcspkr drbg efivars iTCO_wdt joydev ansi_cprng evdev cdc_acm iTCO_vendor_support drm mei shpchp intel_pch_thermal ie31200_edac battery ecdh_generic intel_lpss_acpi rfkill intel_lpss mfd_core video button acpi_als acpi_power_meter acpi_pad kfifo_buf industrialio ipmi_si ipmi_devintf ipmi_msghandler nfsd auth_rpcgss nfs_acl lockd grace sunrpc efivarfs ip_tables x_tables autofs4 ext4 [ 69.914840] crc16 mbcache jbd2 crc32c_generic fscrypto ecb dm_mod ses enclosure sd_mod scsi_transport_sas hid_generic usbhid xhci_pci crc32c_intel xhci_hcd igb ixgbe i2c_algo_bit aesni_intel ahci dca aes_x86_64 libahci usbcore ptp crypto_simd libata cryptd megaraid_sas glue_helper usb_common i2c_i801 pps_core mdio scsi_mod fan thermal i2c_hid hid [ 69.946865] CPU: 1 PID: 1 Comm: systemd Tainted: G W 4.14.0-2-amd64 #1 Debian 4.14.7-1 [ 69.956360] Hardware name: Supermicro Super Server/X11SSH-F, BIOS 2.0b 07/27/2017 [ 69.964301] task: ffffa0552173a040 task.stack: ffffb46243168000 [ 69.970681] RIP: 0010:pids_free+0x15/0x40 [ 69.975149] RSP: 0018:ffffb4624316bd48 EFLAGS: 00010246 [ 69.980829] RAX: ffffa054fb9b3878 RBX: 0000000000000000 RCX: 000000000000000a [ 69.988420] RDX: 000000000000000a RSI: 000000000000000b RDI: ffffa054db731410 [ 69.996002] RBP: ffffb4624316bd50 R08: 0000000000001000 R09: 000000000000000c [ 70.003585] R10: 0000000000000020 R11: ffffa054b84a500b R12: ffffa054db731410 [ 70.011169] R13: ffffffffbc85c1a0 R14: ffffa054fb9b3878 R15: ffffa0551d8bcc00 [ 70.018754] FS: 00007f18193e4980(0000) GS:ffffa05545040000(0000) knlGS:0000000000000000 [ 70.027298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 70.033521] CR2: 00000000000000b0 CR3: 00000008603ae003 CR4: 00000000003626e0 [ 70.041364] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 70.048974] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 70.056702] Call Trace: [ 70.059618] cgroup_free+0x62/0xe0 [ 70.063491] __put_task_struct+0x42/0x150 [ 70.067961] css_task_iter_next+0x74/0x80 [ 70.072432] cgroup_procs_next+0x16/0x20 [ 70.076820] cgroup_seqfile_next+0x1a/0x20 [ 70.081377] kernfs_seq_next+0x27/0x60 [ 70.085590] seq_read+0x2ce/0x3f0 [ 70.089368] kernfs_fop_read+0x134/0x180 [ 70.093753] ? security_file_permission+0x9b/0xc0 [ 70.098970] __vfs_read+0x18/0x40 [ 70.102741] vfs_read+0x8e/0x130 [ 70.106424] SyS_read+0x55/0xc0 [ 70.110021] system_call_fast_compare_end+0xc/0x97 [ 70.115316] RIP: 0033:0x7f1818d0076d [ 70.119344] RSP: 002b:00007ffc19d1a880 EFLAGS: 00000293 ORIG_RAX: 0000000000000000 [ 70.127360] RAX: ffffffffffffffda RBX: 00005582ad1d9440 RCX: 00007f1818d0076d [ 70.134936] RDX: 0000000000001000 RSI: 00005582ad1f60e0 RDI: 000000000000001d [ 70.142502] RBP: 00007f1818fbc440 R08: 00007f1818fc0188 R09: 0000000000001010 [ 70.150067] R10: 0000000000000020 R11: 0000000000000293 R12: 0000000000000000 [ 70.157675] R13: 0000000000000000 R14: 000000000000001d R15: 00005582ad0a15c0 [ 70.165233] Code: b0 00 00 00 00 75 e7 5b 5d c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 53 48 8b 87 70 08 00 00 48 8b 58 50 <48> 83 bb b0 00 00 00 00 74 19 48 89 df e8 e9 fc ff ff 48 8b 9b [ 70.184961] RIP: pids_free+0x15/0x40 RSP: ffffb4624316bd48 [ 70.190878] CR2: 00000000000000b0 [ 70.194615] ---[ end trace 29e4513e3e58325a ]--- [ 71.923126] systemd: 49 output lines suppressed due to ratelimiting [ 71.929864] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 [ 71.929864] [ 71.940121] Kernel Offset: 0x3ac00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 75.216438] Rebooting in 120 seconds.. For the avoidance of doubt, this was obtained with the following kernel cmdline: BOOT_IMAGE=/boot/vmlinuz-4.14.0-2-amd64 root=/dev/mapper/vg_tarquin-rootfs ro intel_iommu=on vsyscall=emulate scsi_mod.use_blk_mq=Y dm_mod.use_blk_mq=Y intel_pstate=passive i915.disable_display=Y apparmor=0 console=ttyS1,115200n8 console=tty0 And the trigger for this was running: systemctl enable NetworkManager-wait-online.service I don't know that this is the same bug at all, but I'm keeping it on this report for now as it seems at least related somehow. HTH, Chris -- Chris Boot bo...@debian.org
