One other example: [ 41.499636] BUG: kernel NULL pointer dereference, address: 0000000000000518 [ 41.506015] #PF: supervisor read access in kernel mode [ 41.508850] #PF: error_code(0x0000) - not-present page [ 41.510728] PGD 0 P4D 0 [ 41.511714] Oops: 0000 [#1] SMP PTI [ 41.513040] CPU: 1 PID: 198 Comm: kworker/u8:4 Tainted: G W 5.8.0-45-generic #51 [ 41.516172] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-1 04/01/2014 [ 41.519019] Workqueue: writeback wb_workfn (flush-252:0) [ 41.520954] RIP: 0010:__mod_memcg_state.part.0+0xc/0x90 [ 41.522845] Code: f0 56 30 93 e8 15 9f 2e 00 5b 41 5c 41 5d 5d c3 4c 8b 25 ff 52 99 01 e9 76 ff ff ff 0f 0b 0f 1f 44 00 00 48 63 d2 55 48 63 f6 <48> 8b 87 18 05 00 00 65 48 8b 0c f0 48 01 ca 48 c1 e6 03 49 89 d0 [ 41.536800] RSP: 0018:ffffabad803ff7d8 EFLAGS: 00010097 [ 41.540726] RAX: ffffffffffffffe2 RBX: 0000000000000011 RCX: 0000000000032192 [ 41.543210] RDX: ffffffffffffffff RSI: 0000000000000011 RDI: 0000000000000000 [ 41.545567] RBP: ffffabad803ff810 R08: ffffffffffffffff R09: ffff96e43801ec00 [ 41.547992] R10: 0000000000000000 R11: 0000000000001000 R12: ffff96e43801ec00 [ 41.550528] R13: ffffffffffffffff R14: 0000000000000000 R15: ffff96e43ffb2000 [ 41.552904] FS: 0000000000000000(0000) GS:ffff96e43dc80000(0000) knlGS:0000000000000000 [ 41.557020] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.559173] CR2: 0000000000000518 CR3: 0000000035f4c000 CR4: 00000000000006e0 [ 41.561005] Call Trace: [ 41.561769] ? __mod_lruvec_state+0x47/0xf0 [ 41.562897] clear_page_dirty_for_io+0x187/0x200 [ 41.564111] mpage_submit_page+0x24/0x90 [ 41.565181] mpage_map_and_submit_buffers+0xe3/0x190 [ 41.566477] mpage_map_and_submit_extent+0x5a/0x200 [ 41.567732] ext4_writepages+0x671/0x860 [ 41.568882] ? update_load_avg+0x82/0x630 [ 41.570181] do_writepages+0x38/0xc0 [ 41.571320] ? write_inode+0x5c/0x100 [ 41.572625] __writeback_single_inode+0x40/0x230 [ 41.574046] writeback_sb_inodes+0x22a/0x4e0 [ 41.575380] __writeback_inodes_wb+0x56/0xf0 [ 41.576798] wb_writeback+0x201/0x2e0 [ 41.578252] wb_check_old_data_flush+0xb7/0xc0 [ 41.580364] wb_do_writeback+0xbe/0x180 [ 41.581989] ? set_worker_desc+0xa6/0xb0 [ 41.583553] wb_workfn+0x74/0x290 [ 41.589094] ? __switch_to+0x7f/0x380 [ 41.590524] ? __switch_to_asm+0x42/0x70 [ 41.591753] ? __switch_to_asm+0x36/0x70 [ 41.593102] process_one_work+0x1e8/0x3b0 [ 41.594571] worker_thread+0x50/0x370 [ 41.595935] kthread+0x12f/0x150 [ 41.597224] ? process_one_work+0x3b0/0x3b0 [ 41.598772] ? __kthread_bind_mask+0x70/0x70 [ 41.600473] ret_from_fork+0x22/0x30 [ 41.601997] Modules linked in: isofs binfmt_misc nls_iso8859_1 input_leds joydev serio_raw sch_fq_codel drm ip_tables x_tables autofs4 ahci xhci_pci xhci_pci_renesas psmouse virtio_net libahci net_failover virtio_blk failover [ 41.609197] CR2: 0000000000000518 [ 41.610567] ---[ end trace 63fecb49c24b6bde ]--- [ 41.612023] RIP: 0010:__mod_memcg_state.part.0+0xc/0x90 [ 41.613631] Code: f0 56 30 93 e8 15 9f 2e 00 5b 41 5c 41 5d 5d c3 4c 8b 25 ff 52 99 01 e9 76 ff ff ff 0f 0b 0f 1f 44 00 00 48 63 d2 55 48 63 f6 <48> 8b 87 18 05 00 00 65 48 8b 0c f0 48 01 ca 48 c1 e6 03 49 89 d0 [ 41.623236] RSP: 0018:ffffabad803ff7d8 EFLAGS: 00010097 [ 41.625530] RAX: ffffffffffffffe2 RBX: 0000000000000011 RCX: 0000000000032192 [ 41.629038] RDX: ffffffffffffffff RSI: 0000000000000011 RDI: 0000000000000000 [ 41.632316] RBP: ffffabad803ff810 R08: ffffffffffffffff R09: ffff96e43801ec00 [ 41.635007] R10: 0000000000000000 R11: 0000000000001000 R12: ffff96e43801ec00 [ 41.637663] R13: ffffffffffffffff R14: 0000000000000000 R15: ffff96e43ffb2000 [ 41.640305] FS: 0000000000000000(0000) GS:ffff96e43dc80000(0000) knlGS:0000000000000000 [ 41.643404] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.645522] CR2: 0000000000000518 CR3: 0000000035f4c000 CR4: 00000000000006e0 [ 41.647610] ------------[ cut here ]------------
-- 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/1918668 Title: vm changes cause NULL pointer derefs Status in linux package in Ubuntu: Invalid Status in linux source package in Groovy: In Progress Bug description: After booting with groovy:linux master-next branch as of 2021-03-10, NULL pointer dereferences are seen. One of them is like the one below: [ 10.012503] BUG: kernel NULL pointer dereference, address: 0000000000000518 [ 10.030761] #PF: supervisor read access in kernel mode [ 10.042518] #PF: error_code(0x0000) - not-present page [ 10.050165] PGD 0 P4D 0 [ 10.077050] Oops: 0000 [#1] SMP PTI [ 10.081927] CPU: 0 PID: 516 Comm: kexec-load Tainted: G W 5.8.0-45-generic #51 [ 10.092486] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-1 04/01/2014 [ 10.103510] RIP: 0010:__mod_memcg_state.part.0+0xc/0x90 [ 10.115100] Code: f0 56 d0 ba e8 f5 9e 2e 00 5b 41 5c 41 5d 5d c3 4c 8b 25 ff 52 99 01 e9 76 ff ff ff 0f 0b 0f 1f 44 00 00 48 63 d2 55 48 63 f6 <48> 8b 87 18 05 00 00 65 48 8b 0c f0 48 01 ca 48 c1 e6 03 49 89 d0 [ 10.145025] RSP: 0018:ffffab9780557ab0 EFLAGS: 00010096 [ 10.146841] RAX: ffffffffffffffe2 RBX: 0000000000000002 RCX: 0000000000032183 [ 10.149891] RDX: ffffffffffffffff RSI: 0000000000000002 RDI: 0000000000000000 [ 10.153006] RBP: ffffab9780557ae8 R08: ffffffffffffffff R09: 0000000000000004 [ 10.165999] R10: fffff30fc1cb2a88 R11: ffffffffffffffff R12: ffff88ec39f32400 [ 10.168142] R13: ffffffffffffffff R14: 0000000000000001 R15: ffff88ec3ffb2000 [ 10.170299] FS: 0000000000000000(0000) GS:ffff88ec3dc00000(0000) knlGS:0000000000000000 [ 10.172783] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 10.175285] CR2: 0000000000000518 CR3: 0000000078a7c000 CR4: 00000000000006f0 [ 10.178009] Call Trace: [ 10.179133] ? __mod_lruvec_state+0x47/0xf0 [ 10.180897] __activate_page.part.0+0x125/0x290 [ 10.182665] __activate_page+0x3a/0x40 [ 10.184496] pagevec_lru_move_fn+0x9d/0xe0 [ 10.186124] ? __activate_page.part.0+0x290/0x290 [ 10.188030] lru_add_drain_cpu+0xeb/0x1b0 [ 10.190041] lru_add_drain+0x28/0x40 [ 10.194029] exit_mmap+0x82/0x1b0 [ 10.195400] ? get_file_caps.constprop.0+0xa2/0x150 [ 10.197578] ? _cond_resched+0x1a/0x50 [ 10.199834] ? mutex_lock+0x13/0x40 [ 10.201931] mmput+0x5f/0x140 [ 10.203772] exec_mmap+0x198/0x220 [ 10.205484] begin_new_exec+0x9e/0x2d0 [ 10.207132] load_elf_binary+0x7b2/0xe20 [ 10.209471] ? ima_bprm_check+0x89/0xb0 [ 10.211378] search_binary_handler+0xe1/0x270 [ 10.213590] exec_binprm+0x51/0x1a0 [ 10.215013] __do_execve_file+0x361/0x5b0 [ 10.216671] do_execve+0x27/0x30 [ 10.218596] __x64_sys_execve+0x2c/0x40 [ 10.220646] do_syscall_64+0x49/0xc0 [ 10.222729] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 10.226379] RIP: 0033:0x7f8881dafb7b [ 10.228548] Code: Unable to access opcode bytes at RIP 0x7f8881dafb51. [ 10.230985] RSP: 002b:00007fffa1572278 EFLAGS: 00000246 ORIG_RAX: 000000000000003b [ 10.233907] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f8881dafb7b [ 10.236543] RDX: 00005576aad6e7a8 RSI: 00005576aad6e788 RDI: 00005576aad6e7d8 [ 10.240265] RBP: 00005576aad6e788 R08: 00005576aad6e7d8 R09: feff5475a9d4ff72 [ 10.243031] R10: 00007f8881d76610 R11: 0000000000000246 R12: 00005576aa32447e [ 10.245755] R13: 00005576aad6e7a8 R14: 00005576aad6e7a8 R15: 00005576aad6e7d8 [ 10.248772] Modules linked in: isofs binfmt_misc nls_iso8859_1 joydev input_leds serio_raw sch_fq_codel drm ip_tables x_tables autofs4 ahci psmouse libahci virtio_blk xhci_pci xhci_pci_renesas virtio_net net_failover failover [ 10.258738] CR2: 0000000000000518 [ 10.260139] ---[ end trace f7c347003caf39b8 ]--- To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1918668/+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
