Yes, you are absolutely correct. I can reproduce this now, when kernel.core_pattern is set to "|".
I can also confirm that the first kernel that this is broken in is 5.3, as it works fine in 5.2 and below. I will look into this and hopefully get this fixed for you. Thanks for reporting! Engineering Notes: RIP: 0010:do_coredump+0x536/0xb30 $ eu-addr2line do_coredump+0x536 -e vmlinux-5.3.0-29-generic /build/linux-OZAq_R/linux-5.3.0/include/linux/fs.h:2841:7 This is the function file_start_write(): 2839 static inline void file_start_write(struct file *file) 2840 { 2841 if (!S_ISREG(file_inode(file)->i_mode)) 2842 return; 2843 __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true); 2844 } This is called from do_coredump(): 565 void do_coredump(const kernel_siginfo_t *siginfo) 566 { ... 788 if (!dump_interrupted()) { 789 file_start_write(cprm.file); 790 core_dumped = binfmt->core_dump(&cprm); 791 file_end_write(cprm.file); 792 } ... 810 } On kernels 5.2 and before, kernel.core_pattern=| normally outputs: [ 39.328638] Core dump to | pipe failed This is output is from the pipe section of do_coredump(): 565 void do_coredump(const kernel_siginfo_t *siginfo) 566 { ... 623 ispipe = format_corename(&cn, &cprm, &argv, &argc); 624 625 if (ispipe) { ... 681 sub_info = call_usermodehelper_setup(helper_argv[0], 682 helper_argv, NULL, GFP_KERNEL, 683 umh_pipe_setup, NULL, &cprm); 684 if (sub_info) 685 retval = call_usermodehelper_exec(sub_info, 686 UMH_WAIT_EXEC); 687 688 kfree(helper_argv); 689 if (retval) { 690 printk(KERN_INFO "Core dump to |%s pipe failed\n", 691 cn.corename); 692 goto close_fail; 693 } ... 810 } With kernel.core_pattern=|, format_corename() still interprets this as the pipe path with: 191 static int format_corename(struct core_name *cn, struct coredump_params *cprm, 192 size_t **argv, int *argc) 193 { ... 196 int ispipe = (*pat_ptr == '|'); ... 335 return ispipe; 336 } Which checks the first byte of the core_pattern string to see if it is a "|". This means we really want the call to call_usermodehelper_exec() in do_coredump() to fail, so we take the if(retval) step and output "Core dump to |%s pipe failed\n". Note that cn.corename is NULL when kernel.core_pattern=|. For some reason with 5.3 and later, this call to call_usermodehelper_exec() is not failing, and execution continues on and breaks at file_start_write(cprm.file); at the end of do_coredump(). call_usermodehelper_exec() calls umh_pipe_setup() and creates the pipe used. Something has likely changed in the pipe subsystem. I will update when I figure out what. ** Also affects: linux (Ubuntu Eoan) Importance: Undecided Status: New ** Also affects: linux (Ubuntu Focal) Importance: Undecided Status: Confirmed ** Changed in: linux (Ubuntu Eoan) Status: New => Confirmed ** Changed in: linux (Ubuntu Eoan) Importance: Undecided => Medium ** Changed in: linux (Ubuntu Focal) Importance: Undecided => Medium ** Changed in: linux (Ubuntu Eoan) Assignee: (unassigned) => Matthew Ruffell (mruffell) ** Changed in: linux (Ubuntu Focal) Assignee: (unassigned) => Matthew Ruffell (mruffell) ** Description changed: If process that listens socket on any port crashes (segmentation fault) it becomes unkillable. Kill command does not kill this process. Port that listen crashed process never be freed. journalctl shows error: Feb 13 13:28:09 vbun04 kernel: socktest[1359]: segfault at 21 ip 000055ec3a6bf11e sp 00007ffd88899fb0 error 6 in socktest[55ec3a6bf000+1000] Feb 13 13:28:09 vbun04 kernel: Code: 04 24 02 00 17 70 89 c5 48 b8 30 30 30 30 30 30 30 30 89 ef 48 89 44 24 08 e8 8e ff ff ff be 0a 00 00 00 89 ef e8 72 ff ff ff <c7> 04 25 21 00 00 00 21 00 00 00 48 8b 44 24 18 Feb 13 13:28:09 vbun04 kernel: BUG: kernel NULL pointer dereference, address: 0000000000000020 Feb 13 13:28:09 vbun04 kernel: #PF: supervisor read access in kernel mode Feb 13 13:28:09 vbun04 kernel: #PF: error_code(0x0000) - not-present page Feb 13 13:28:09 vbun04 kernel: PGD 0 P4D 0 Feb 13 13:28:09 vbun04 kernel: Oops: 0000 [#1] SMP NOPTI Feb 13 13:28:09 vbun04 kernel: CPU: 1 PID: 1359 Comm: socktest Tainted: G OE 5.3.0-29-generic #31-Ubuntu Feb 13 13:28:09 vbun04 kernel: Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 Feb 13 13:28:09 vbun04 kernel: RIP: 0010:do_coredump+0x536/0xb30 Feb 13 13:28:09 vbun04 kernel: Code: 00 48 8b bd 18 ff ff ff 48 85 ff 74 05 e8 c2 47 fa ff 65 48 8b 04 25 c0 6b 01 00 48 8b 00 48 8b 7d a0 a8 04 0f 85 65 05 00 00 <48> 8b 57 20 0f b7 02 66 25 00 f0 66 3d 00 80 0f Feb 13 13:28:09 vbun04 kernel: RSP: 0000:ffffb464c2c5fca8 EFLAGS: 00010246 Feb 13 13:28:09 vbun04 kernel: RAX: 0000000000000000 RBX: ffff9d4b76995100 RCX: 0000000000001afc Feb 13 13:28:09 vbun04 kernel: RDX: 0000000000000000 RSI: ffffb464c2c5fc68 RDI: 0000000000000000 Feb 13 13:28:09 vbun04 kernel: RBP: ffffb464c2c5fdd8 R08: 0000000000000400 R09: ffffb464c2c5fbe0 Feb 13 13:28:09 vbun04 kernel: R10: ffff9d4b75d01170 R11: 0000000000000000 R12: ffff9d4b7b3df540 Feb 13 13:28:09 vbun04 kernel: R13: 0000000000000001 R14: 0000000000000000 R15: ffffffffb9f15920 Feb 13 13:28:09 vbun04 kernel: FS: 00007f6c91911540(0000) GS:ffff9d4b7db00000(0000) knlGS:0000000000000000 Feb 13 13:28:09 vbun04 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Feb 13 13:28:09 vbun04 kernel: CR2: 0000000000000020 CR3: 00000000723ac003 CR4: 00000000000606e0 Feb 13 13:28:09 vbun04 kernel: Call Trace: Feb 13 13:28:09 vbun04 kernel: ? wake_up_state+0x10/0x20 Feb 13 13:28:09 vbun04 kernel: ? __send_signal+0x1eb/0x3f0 Feb 13 13:28:09 vbun04 kernel: get_signal+0x159/0x880 Feb 13 13:28:09 vbun04 kernel: do_signal+0x34/0x280 Feb 13 13:28:09 vbun04 kernel: ? bad_area+0x47/0x50 Feb 13 13:28:09 vbun04 kernel: exit_to_usermode_loop+0xbf/0x160 Feb 13 13:28:09 vbun04 kernel: prepare_exit_to_usermode+0x77/0xa0 Feb 13 13:28:09 vbun04 kernel: retint_user+0x8/0x8 Feb 13 13:28:09 vbun04 kernel: RIP: 0033:0x55ec3a6bf11e Feb 13 13:28:09 vbun04 kernel: Code: 04 24 02 00 17 70 89 c5 48 b8 30 30 30 30 30 30 30 30 89 ef 48 89 44 24 08 e8 8e ff ff ff be 0a 00 00 00 89 ef e8 72 ff ff ff <c7> 04 25 21 00 00 00 21 00 00 00 48 8b 44 24 18 Feb 13 13:28:09 vbun04 kernel: RSP: 002b:00007ffd88899fb0 EFLAGS: 00010217 Feb 13 13:28:09 vbun04 kernel: RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f6c918424eb Feb 13 13:28:09 vbun04 kernel: RDX: 0000000000000010 RSI: 000000000000000a RDI: 0000000000000003 Feb 13 13:28:09 vbun04 kernel: RBP: 0000000000000003 R08: 0000000000000000 R09: 00007f6c919331f0 Feb 13 13:28:09 vbun04 kernel: R10: 0000000000000000 R11: 0000000000000217 R12: 000055ec3a6bf150 Feb 13 13:28:09 vbun04 kernel: R13: 00007ffd8889a0b0 R14: 0000000000000000 R15: 0000000000000000 Feb 13 13:28:09 vbun04 kernel: Modules linked in: vboxsf(OE) nls_utf8 isofs vboxvideo(OE) intel_rapl_msr intel_rapl_common crct10dif_pclmul vmwgfx crc32_pclmul ghash_clmulni_intel aesni_intel ttm drm_kms_helper a Feb 13 13:28:09 vbun04 kernel: CR2: 0000000000000020 Feb 13 13:28:09 vbun04 kernel: ---[ end trace 278d665c8727286a ]--- Feb 13 13:28:09 vbun04 kernel: RIP: 0010:do_coredump+0x536/0xb30 Feb 13 13:28:09 vbun04 kernel: Code: 00 48 8b bd 18 ff ff ff 48 85 ff 74 05 e8 c2 47 fa ff 65 48 8b 04 25 c0 6b 01 00 48 8b 00 48 8b 7d a0 a8 04 0f 85 65 05 00 00 <48> 8b 57 20 0f b7 02 66 25 00 f0 66 3d 00 80 0f Feb 13 13:28:09 vbun04 kernel: RSP: 0000:ffffb464c2c5fca8 EFLAGS: 00010246 Feb 13 13:28:09 vbun04 kernel: RAX: 0000000000000000 RBX: ffff9d4b76995100 RCX: 0000000000001afc Feb 13 13:28:09 vbun04 kernel: RDX: 0000000000000000 RSI: ffffb464c2c5fc68 RDI: 0000000000000000 Feb 13 13:28:09 vbun04 kernel: RBP: ffffb464c2c5fdd8 R08: 0000000000000400 R09: ffffb464c2c5fbe0 Feb 13 13:28:09 vbun04 kernel: R10: ffff9d4b75d01170 R11: 0000000000000000 R12: ffff9d4b7b3df540 Feb 13 13:28:09 vbun04 kernel: R13: 0000000000000001 R14: 0000000000000000 R15: ffffffffb9f15920 Feb 13 13:28:09 vbun04 kernel: FS: 00007f6c91911540(0000) GS:ffff9d4b7db00000(0000) knlGS:0000000000000000 Feb 13 13:28:09 vbun04 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Feb 13 13:28:09 vbun04 kernel: CR2: 0000000000000020 CR3: 00000000723ac003 CR4: 00000000000606e0 + Steps to Reproduce: + Set kernel.core_pattern sysctl to "|" to disable coredumps. - Steps to Reproduce: + $ sudo sysctl kernel.core_pattern="|" Compile and run following code: #include <sys/socket.h> #include <netinet/in.h> #include <string.h> int main() { - int listenfd = 0; - struct sockaddr_in serv_addr; + int listenfd = 0; + struct sockaddr_in serv_addr; - listenfd = socket(AF_INET, SOCK_STREAM, 0); - memset(&serv_addr, '0', sizeof(serv_addr)); + listenfd = socket(AF_INET, SOCK_STREAM, 0); + memset(&serv_addr, '0', sizeof(serv_addr)); - serv_addr.sin_family = AF_INET; - serv_addr.sin_addr.s_addr = htonl(INADDR_ANY); - serv_addr.sin_port = htons(6000); + serv_addr.sin_family = AF_INET; + serv_addr.sin_addr.s_addr = htonl(INADDR_ANY); + serv_addr.sin_port = htons(6000); - bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)); + bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)); - listen(listenfd, 10); + listen(listenfd, 10); - *(int*)33 = 33; + *(int*)33 = 33; - return 0; + return 0; } Process segfaulted and becomes unkillable, opened socket ports busy. ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: linux-image-generic 5.3.0.29.33 ProcVersionSignature: Ubuntu 5.3.0-29.31-generic 5.3.13 Uname: Linux 5.3.0-29-generic x86_64 AlsaDevices: - total 0 - crw-rw----+ 1 root audio 116, 1 фев 13 13:24 seq - crw-rw----+ 1 root audio 116, 33 фев 13 13:24 timer + total 0 + crw-rw----+ 1 root audio 116, 1 фев 13 13:24 seq + crw-rw----+ 1 root audio 116, 33 фев 13 13:24 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.11-0ubuntu8.2 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CurrentDesktop: KDE Date: Thu Feb 13 13:49:19 2020 IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig' Lsusb: Error: [Errno 2] No such file or directory: 'lsusb': 'lsusb' MachineType: innotek GmbH VirtualBox PciMultimedia: - + ProcFB: 0 svgadrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-29-generic root=UUID=cd3a004e-4e27-4c93-8ae6-e1942680f565 ro mitigations=off ipv6.disable=1 net.ifnames=0 video=1280x960 RelatedPackageVersions: - linux-restricted-modules-5.3.0-29-generic N/A - linux-backports-modules-5.3.0-29-generic N/A - linux-firmware 1.183.3 + linux-restricted-modules-5.3.0-29-generic N/A + linux-backports-modules-5.3.0-29-generic N/A + linux-firmware 1.183.3 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) WifiSyslog: - + dmi.bios.date: 12/01/2006 dmi.bios.vendor: innotek GmbH dmi.bios.version: VirtualBox dmi.board.name: VirtualBox dmi.board.vendor: Oracle Corporation dmi.board.version: 1.2 dmi.chassis.type: 1 dmi.chassis.vendor: Oracle Corporation dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr: dmi.product.family: Virtual Machine dmi.product.name: VirtualBox dmi.product.version: 1.2 dmi.sys.vendor: innotek GmbH ** Tags added: seg -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1863086 Title: unkillable process (kernel NULL pointer dereference) Status in linux package in Ubuntu: Confirmed Status in linux source package in Eoan: Confirmed Status in linux source package in Focal: Confirmed Bug description: If process that listens socket on any port crashes (segmentation fault) it becomes unkillable. Kill command does not kill this process. Port that listen crashed process never be freed. journalctl shows error: Feb 13 13:28:09 vbun04 kernel: socktest[1359]: segfault at 21 ip 000055ec3a6bf11e sp 00007ffd88899fb0 error 6 in socktest[55ec3a6bf000+1000] Feb 13 13:28:09 vbun04 kernel: Code: 04 24 02 00 17 70 89 c5 48 b8 30 30 30 30 30 30 30 30 89 ef 48 89 44 24 08 e8 8e ff ff ff be 0a 00 00 00 89 ef e8 72 ff ff ff <c7> 04 25 21 00 00 00 21 00 00 00 48 8b 44 24 18 Feb 13 13:28:09 vbun04 kernel: BUG: kernel NULL pointer dereference, address: 0000000000000020 Feb 13 13:28:09 vbun04 kernel: #PF: supervisor read access in kernel mode Feb 13 13:28:09 vbun04 kernel: #PF: error_code(0x0000) - not-present page Feb 13 13:28:09 vbun04 kernel: PGD 0 P4D 0 Feb 13 13:28:09 vbun04 kernel: Oops: 0000 [#1] SMP NOPTI Feb 13 13:28:09 vbun04 kernel: CPU: 1 PID: 1359 Comm: socktest Tainted: G OE 5.3.0-29-generic #31-Ubuntu Feb 13 13:28:09 vbun04 kernel: Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 Feb 13 13:28:09 vbun04 kernel: RIP: 0010:do_coredump+0x536/0xb30 Feb 13 13:28:09 vbun04 kernel: Code: 00 48 8b bd 18 ff ff ff 48 85 ff 74 05 e8 c2 47 fa ff 65 48 8b 04 25 c0 6b 01 00 48 8b 00 48 8b 7d a0 a8 04 0f 85 65 05 00 00 <48> 8b 57 20 0f b7 02 66 25 00 f0 66 3d 00 80 0f Feb 13 13:28:09 vbun04 kernel: RSP: 0000:ffffb464c2c5fca8 EFLAGS: 00010246 Feb 13 13:28:09 vbun04 kernel: RAX: 0000000000000000 RBX: ffff9d4b76995100 RCX: 0000000000001afc Feb 13 13:28:09 vbun04 kernel: RDX: 0000000000000000 RSI: ffffb464c2c5fc68 RDI: 0000000000000000 Feb 13 13:28:09 vbun04 kernel: RBP: ffffb464c2c5fdd8 R08: 0000000000000400 R09: ffffb464c2c5fbe0 Feb 13 13:28:09 vbun04 kernel: R10: ffff9d4b75d01170 R11: 0000000000000000 R12: ffff9d4b7b3df540 Feb 13 13:28:09 vbun04 kernel: R13: 0000000000000001 R14: 0000000000000000 R15: ffffffffb9f15920 Feb 13 13:28:09 vbun04 kernel: FS: 00007f6c91911540(0000) GS:ffff9d4b7db00000(0000) knlGS:0000000000000000 Feb 13 13:28:09 vbun04 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Feb 13 13:28:09 vbun04 kernel: CR2: 0000000000000020 CR3: 00000000723ac003 CR4: 00000000000606e0 Feb 13 13:28:09 vbun04 kernel: Call Trace: Feb 13 13:28:09 vbun04 kernel: ? wake_up_state+0x10/0x20 Feb 13 13:28:09 vbun04 kernel: ? __send_signal+0x1eb/0x3f0 Feb 13 13:28:09 vbun04 kernel: get_signal+0x159/0x880 Feb 13 13:28:09 vbun04 kernel: do_signal+0x34/0x280 Feb 13 13:28:09 vbun04 kernel: ? bad_area+0x47/0x50 Feb 13 13:28:09 vbun04 kernel: exit_to_usermode_loop+0xbf/0x160 Feb 13 13:28:09 vbun04 kernel: prepare_exit_to_usermode+0x77/0xa0 Feb 13 13:28:09 vbun04 kernel: retint_user+0x8/0x8 Feb 13 13:28:09 vbun04 kernel: RIP: 0033:0x55ec3a6bf11e Feb 13 13:28:09 vbun04 kernel: Code: 04 24 02 00 17 70 89 c5 48 b8 30 30 30 30 30 30 30 30 89 ef 48 89 44 24 08 e8 8e ff ff ff be 0a 00 00 00 89 ef e8 72 ff ff ff <c7> 04 25 21 00 00 00 21 00 00 00 48 8b 44 24 18 Feb 13 13:28:09 vbun04 kernel: RSP: 002b:00007ffd88899fb0 EFLAGS: 00010217 Feb 13 13:28:09 vbun04 kernel: RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f6c918424eb Feb 13 13:28:09 vbun04 kernel: RDX: 0000000000000010 RSI: 000000000000000a RDI: 0000000000000003 Feb 13 13:28:09 vbun04 kernel: RBP: 0000000000000003 R08: 0000000000000000 R09: 00007f6c919331f0 Feb 13 13:28:09 vbun04 kernel: R10: 0000000000000000 R11: 0000000000000217 R12: 000055ec3a6bf150 Feb 13 13:28:09 vbun04 kernel: R13: 00007ffd8889a0b0 R14: 0000000000000000 R15: 0000000000000000 Feb 13 13:28:09 vbun04 kernel: Modules linked in: vboxsf(OE) nls_utf8 isofs vboxvideo(OE) intel_rapl_msr intel_rapl_common crct10dif_pclmul vmwgfx crc32_pclmul ghash_clmulni_intel aesni_intel ttm drm_kms_helper a Feb 13 13:28:09 vbun04 kernel: CR2: 0000000000000020 Feb 13 13:28:09 vbun04 kernel: ---[ end trace 278d665c8727286a ]--- Feb 13 13:28:09 vbun04 kernel: RIP: 0010:do_coredump+0x536/0xb30 Feb 13 13:28:09 vbun04 kernel: Code: 00 48 8b bd 18 ff ff ff 48 85 ff 74 05 e8 c2 47 fa ff 65 48 8b 04 25 c0 6b 01 00 48 8b 00 48 8b 7d a0 a8 04 0f 85 65 05 00 00 <48> 8b 57 20 0f b7 02 66 25 00 f0 66 3d 00 80 0f Feb 13 13:28:09 vbun04 kernel: RSP: 0000:ffffb464c2c5fca8 EFLAGS: 00010246 Feb 13 13:28:09 vbun04 kernel: RAX: 0000000000000000 RBX: ffff9d4b76995100 RCX: 0000000000001afc Feb 13 13:28:09 vbun04 kernel: RDX: 0000000000000000 RSI: ffffb464c2c5fc68 RDI: 0000000000000000 Feb 13 13:28:09 vbun04 kernel: RBP: ffffb464c2c5fdd8 R08: 0000000000000400 R09: ffffb464c2c5fbe0 Feb 13 13:28:09 vbun04 kernel: R10: ffff9d4b75d01170 R11: 0000000000000000 R12: ffff9d4b7b3df540 Feb 13 13:28:09 vbun04 kernel: R13: 0000000000000001 R14: 0000000000000000 R15: ffffffffb9f15920 Feb 13 13:28:09 vbun04 kernel: FS: 00007f6c91911540(0000) GS:ffff9d4b7db00000(0000) knlGS:0000000000000000 Feb 13 13:28:09 vbun04 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Feb 13 13:28:09 vbun04 kernel: CR2: 0000000000000020 CR3: 00000000723ac003 CR4: 00000000000606e0 Steps to Reproduce: Set kernel.core_pattern sysctl to "|" to disable coredumps. $ sudo sysctl kernel.core_pattern="|" Compile and run following code: #include <sys/socket.h> #include <netinet/in.h> #include <string.h> int main() { int listenfd = 0; struct sockaddr_in serv_addr; listenfd = socket(AF_INET, SOCK_STREAM, 0); memset(&serv_addr, '0', sizeof(serv_addr)); serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = htonl(INADDR_ANY); serv_addr.sin_port = htons(6000); bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)); listen(listenfd, 10); *(int*)33 = 33; return 0; } Process segfaulted and becomes unkillable, opened socket ports busy. ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: linux-image-generic 5.3.0.29.33 ProcVersionSignature: Ubuntu 5.3.0-29.31-generic 5.3.13 Uname: Linux 5.3.0-29-generic x86_64 AlsaDevices: total 0 crw-rw----+ 1 root audio 116, 1 фев 13 13:24 seq crw-rw----+ 1 root audio 116, 33 фев 13 13:24 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.11-0ubuntu8.2 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CurrentDesktop: KDE Date: Thu Feb 13 13:49:19 2020 IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig' Lsusb: Error: [Errno 2] No such file or directory: 'lsusb': 'lsusb' MachineType: innotek GmbH VirtualBox PciMultimedia: ProcFB: 0 svgadrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-29-generic root=UUID=cd3a004e-4e27-4c93-8ae6-e1942680f565 ro mitigations=off ipv6.disable=1 net.ifnames=0 video=1280x960 RelatedPackageVersions: linux-restricted-modules-5.3.0-29-generic N/A linux-backports-modules-5.3.0-29-generic N/A linux-firmware 1.183.3 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) WifiSyslog: dmi.bios.date: 12/01/2006 dmi.bios.vendor: innotek GmbH dmi.bios.version: VirtualBox dmi.board.name: VirtualBox dmi.board.vendor: Oracle Corporation dmi.board.version: 1.2 dmi.chassis.type: 1 dmi.chassis.vendor: Oracle Corporation dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr: dmi.product.family: Virtual Machine dmi.product.name: VirtualBox dmi.product.version: 1.2 dmi.sys.vendor: innotek GmbH To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1863086/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp