On Fri, Mar 9, 2018 at 9:49 AM, Joseph Salisbury <joseph.salisb...@canonical.com> wrote: > Did this issue start happening after an update/upgrade? Was there a > prior kernel version where you were not having this particular problem?
I don't think so; how we're using/clearing/stopping bcache has changed. I can reproduce this on multiple trusty kernels: 3.13.0-101-generic (buildd@lgw01-40) #148-Ubuntu SMP Thu Oct 20 22:08:32 UTC 2016 3.13.0-107-generic (buildd@lcy01-09) #154-Ubuntu SMP Tue Dec 20 09:57:27 UTC 2016 3.13.0-137-generic (buildd@lgw01-amd64-058) #186-Ubuntu SMP Mon Dec 4 19:09:19 UTC 2017 3.13.0-143-generic (buildd@lcy01-amd64-010) #192-Ubuntu SMP Tue Feb 27 10:45:36 UTC 2018 > > Would it be possible for you to test the latest upstream kernel? Refer > to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest > v4.16 kernel[0]. I can confirm that newer kernels do not have this issue: 4.4.0-116-generic (buildd@lcy01-amd64-023) (gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.4)) Xenial, Artful and Bionic are fine. > > If this bug is fixed in the mainline kernel, please add the following > tag 'kernel-fixed-upstream'. > > If the mainline kernel does not fix this bug, please add the tag: > 'kernel-bug-exists-upstream'. > > Once testing of the upstream kernel is complete, please mark this bug as > "Confirmed". > > > Thanks in advance. > > [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16-rc4 > > ** Changed in: linux (Ubuntu Trusty) > Importance: Undecided => Medium > > ** Changed in: linux (Ubuntu) > Importance: Undecided => Medium > > ** Tags added: kernel-da-key > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/1754581 > > Title: > trusty bcache NULL pointer exception > > To manage notifications about this bug go to: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1754581/+subscriptions -- 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/1754581 Title: trusty bcache NULL pointer exception Status in linux package in Ubuntu: Incomplete Status in linux source package in Trusty: Incomplete Bug description: successfully wiped device /dev/md0 on attempt 1/4 shutdown running on holder type: 'bcache' syspath: '/sys/class/block/bcache0' stopping bcache cacheset at: /sys/fs/bcache/7834b3df-d029-49a3-9c1b-3fd628db10f2 waiting for /sys/fs/bcache/7834b3df-d029-49a3-9c1b-3fd628db10f2 to be removed /sys/fs/bcache/7834b3df-d029-49a3-9c1b-3fd628db10f2 has been removed [ 70.788038] BUG: unable to handle kernel NULL pointer dereference at 0000000000000a00 [ 70.789098] IP: [<ffffffffa0272440>] journal_write_unlocked+0x130/0x570 [bcache] [ 70.790167] PGD 800000000dfa0067 PUD dfb2067 PMD 0 [ 70.790831] Oops: 0000 [#1] SMP [ 70.791314] Modules linked in: bcache ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr dm_crypt kvm_intel kvm ppdev serio_raw parport_pc parport mac_hid i2c_piix4 overlayfs squashfs iscsi_ibft iscsi_boot_sysfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi raid10 raid456 async_memcpy async_raid6_recov async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear psmouse virtio_scsi floppy pata_acpi [ 70.792016] CPU: 0 PID: 10996 Comm: kworker/0:3 Not tainted 3.13.0-142-generic #191-Ubuntu [ 70.792016] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 [ 70.792016] Workqueue: events journal_write_work [bcache] [ 70.792016] task: ffff88000df76000 ti: ffff88003a14c000 task.ti: ffff88003a14c000 [ 70.792016] RIP: 0010:[<ffffffffa0272440>] [<ffffffffa0272440>] journal_write_unlocked+0x130/0x570 [bcache] [ 70.792016] RSP: 0000:ffff88003a14dd88 EFLAGS: 00010202 [ 70.792016] RAX: 0000000000000000 RBX: ffff88003bf4cba0 RCX: 0000000000000000 [ 70.792016] RDX: ffff88003bf40c48 RSI: ffff88003bf4cad8 RDI: ffff88003bec8040 [ 70.792016] RBP: ffff88003a14dde0 R08: 2000efd32f400000 R09: 5e80000000000000 [ 70.792016] R10: dffe982d0cb4cbd0 R11: 0000000000000005 R12: 0000000000000031 [ 70.792016] R13: ffff88003bf4ccc8 R14: 0000000000000001 R15: ffff88003bf40000 [ 70.792016] FS: 0000000000000000(0000) GS:ffff88003e200000(0000) knlGS:0000000000000000 [ 70.792016] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 70.792016] CR2: 0000000000000a00 CR3: 000000003a1ae000 CR4: 0000000000000670 [ 70.792016] Stack: [ 70.792016] ffff88003a14ddb0 ffff88003bf40000 ffff88003a14dde8 ffffffff81013558 [ 70.792016] 000000000df71868 ffff88000df764e8 ffff88003bf40000 ffff88003bf4cba0 [ 70.792016] ffff88003e217300 0000000000000000 ffff88003bf4cbd0 ffff88003a14de00 [ 70.792016] Call Trace: [ 70.792016] [<ffffffff81013558>] ? __switch_to+0xe8/0x4f0 [ 70.792016] [<ffffffffa02728d0>] journal_try_write+0x50/0x60 [bcache] [ 70.792016] [<ffffffffa0272902>] journal_write_work+0x22/0x30 [bcache] [ 70.792016] [<ffffffff81087cb8>] process_one_work+0x178/0x470 [ 70.792016] [<ffffffff81088ad1>] worker_thread+0x121/0x410 [ 70.792016] [<ffffffff810889b0>] ? rescuer_thread+0x430/0x430 [ 70.792016] [<ffffffff8108f8b9>] kthread+0xc9/0xe0 [ 70.792016] [<ffffffff8108f7f0>] ? kthread_create_on_node+0x1c0/0x1c0 [ 70.792016] [<ffffffff8173f6a8>] ret_from_fork+0x58/0x90 [ 70.792016] [<ffffffff8108f7f0>] ? kthread_create_on_node+0x1c0/0x1c0 [ 70.792016] Code: 10 00 00 00 e8 a2 7a 10 e1 31 c0 66 83 bb 94 38 ff ff 00 48 8b 8b a0 40 ff ff 49 8d 97 48 0c 00 00 74 3b 0f 1f 84 00 00 00 00 00 <48> 8b b9 00 0a 00 00 0f b7 89 ce 00 00 00 83 c0 01 49 8b 75 00 [ 70.792016] RIP [<ffffffffa0272440>] journal_write_unlocked+0x130/0x570 [bcache] [ 70.792016] RSP <ffff88003a14dd88> [ 70.792016] CR2: 0000000000000a00 [ 70.792016] ---[ end trace c5387a4b27c41667 ]--- Running command ['udevadm', 'settle'] with allowed return codes [0] (capture=False) [ 70.831831] BUG: unable to handle kernel paging request at ffffffffffffffd8 [ 70.832822] IP: [<ffffffff8108ff90>] kthread_data+0x10/0x20 [ 70.833396] PGD 1c13067 PUD 1c15067 PMD 0 [ 70.833396] Oops: 0000 [#2] SMP [ 70.833396] Modules linked in: bcache ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr dm_crypt kvm_intel kvm ppdev serio_raw parport_pc parport mac_hid i2c_piix4 overlayfs squashfs iscsi_ibft iscsi_boot_sysfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi raid10 raid456 async_memcpy async_raid6_recov async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear psmouse virtio_scsi floppy pata_acpi [ 70.833396] CPU: 0 PID: 10996 Comm: kworker/0:3 Tainted: G D 3.13.0-142-generic #191-Ubuntu [ 70.833396] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 [ 70.833396] task: ffff88000df76000 ti: ffff88003a14c000 task.ti: ffff88003a14c000 [ 70.833396] RIP: 0010:[<ffffffff8108ff90>] [<ffffffff8108ff90>] kthread_data+0x10/0x20 [ 70.833396] RSP: 0018:ffff88003a14d9c0 EFLAGS: 00010002 [ 70.833396] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000000f [ 70.833396] RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffff88000df76000 [ 70.833396] RBP: ffff88003a14d9c0 R08: 0000000000000000 R09: ffff88003e216f20 [ 70.833396] R10: ffffffff8106887c R11: ffffea0000357200 R12: ffff88003e213b00 [ 70.833396] R13: 0000000000000000 R14: ffff88000df75ff0 R15: ffff88000df76000 [ 70.833396] FS: 0000000000000000(0000) GS:ffff88003e200000(0000) knlGS:0000000000000000 [ 70.833396] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 70.833396] CR2: 0000000000000028 CR3: 00000000384d0000 CR4: 0000000000000670 [ 70.833396] Stack: [ 70.833396] ffff88003a14d9d8 ffffffff81089291 ffff88000df76000 ffff88003a14da38 [ 70.833396] ffffffff817329b9 ffff88000df76000 0000000000013b00 ffff88003a14dfd8 [ 70.833396] 0000000000013b00 ffff88000df76000 ffff88000df76650 ffff88000df75ff0 [ 70.833396] Call Trace: [ 70.833396] [<ffffffff81089291>] wq_worker_sleeping+0x11/0x90 [ 70.833396] [<ffffffff817329b9>] __schedule+0x539/0x730 [ 70.833396] [<ffffffff81732bd9>] schedule+0x29/0x70 [ 70.833396] [<ffffffff8106d95f>] do_exit+0x6cf/0xa60 [ 70.833396] [<ffffffff817381c9>] oops_end+0xa9/0x150 [ 70.833396] [<ffffffff81727106>] no_context+0x27e/0x28b [ 70.833396] [<ffffffff81727186>] __bad_area_nosemaphore+0x73/0x1ca [ 70.833396] [<ffffffff817272f0>] bad_area_nosemaphore+0x13/0x15 [ 70.833396] [<ffffffff8173ac67>] __do_page_fault+0xa7/0x560 [ 70.833396] [<ffffffff810a861c>] ? check_preempt_wakeup+0x17c/0x270 [ 70.833396] [<ffffffff8173757a>] ? error_entry+0x12a/0x179 [ 70.833396] [<ffffffff81737573>] ? error_entry+0x123/0x179 [ 70.833396] [<ffffffff8173756c>] ? error_entry+0x11c/0x179 [ 70.833396] [<ffffffff81737565>] ? error_entry+0x115/0x179 [ 70.833396] [<ffffffff8173755e>] ? error_entry+0x10e/0x179 [ 70.833396] [<ffffffff81737557>] ? error_entry+0x107/0x179 [ 70.833396] [<ffffffff81737550>] ? error_entry+0x100/0x179 [ 70.833396] [<ffffffff81737549>] ? error_entry+0xf9/0x179 [ 70.833396] [<ffffffff81737542>] ? error_entry+0xf2/0x179 [ 70.833396] [<ffffffff8173753b>] ? error_entry+0xeb/0x179 [ 70.833396] [<ffffffff81737534>] ? error_entry+0xe4/0x179 [ 70.833396] [<ffffffff8173752d>] ? error_entry+0xdd/0x179 [ 70.833396] [<ffffffff81737526>] ? error_entry+0xd6/0x179 [ 70.833396] [<ffffffff8173751f>] ? error_entry+0xcf/0x179 [ 70.833396] [<ffffffff81737518>] ? error_entry+0xc8/0x179 [ 70.833396] [<ffffffff81737511>] ? error_entry+0xc1/0x179 [ 70.833396] [<ffffffff8173750a>] ? error_entry+0xba/0x179 [ 70.833396] [<ffffffff81737503>] ? error_entry+0xb3/0x179 [ 70.833396] [<ffffffff8173b13a>] do_page_fault+0x1a/0x70 [ 70.833396] [<ffffffff817374cb>] ? error_entry+0x7b/0x179 [ 70.833396] [<ffffffff817374c4>] ? error_entry+0x74/0x179 [ 70.833396] [<ffffffff8173a7c9>] do_async_page_fault+0x29/0xe0 [ 70.833396] [<ffffffff817372e8>] async_page_fault+0x28/0x30 [ 70.833396] [<ffffffffa0272440>] ? journal_write_unlocked+0x130/0x570 [bcache] [ 70.833396] [<ffffffffa027241e>] ? journal_write_unlocked+0x10e/0x570 [bcache] [ 70.833396] [<ffffffff81013558>] ? __switch_to+0xe8/0x4f0 [ 70.833396] [<ffffffffa02728d0>] journal_try_write+0x50/0x60 [bcache] [ 70.833396] [<ffffffffa0272902>] journal_write_work+0x22/0x30 [bcache] [ 70.833396] [<ffffffff81087cb8>] process_one_work+0x178/0x470 [ 70.833396] [<ffffffff81088ad1>] worker_thread+0x121/0x410 [ 70.833396] [<ffffffff810889b0>] ? rescuer_thread+0x430/0x430 [ 70.833396] [<ffffffff8108f8b9>] kthread+0xc9/0xe0 [ 70.833396] [<ffffffff8108f7f0>] ? kthread_create_on_node+0x1c0/0x1c0 [ 70.833396] [<ffffffff8173f6a8>] ret_from_fork+0x58/0x90 [ 70.833396] [<ffffffff8108f7f0>] ? kthread_create_on_node+0x1c0/0x1c0 [ 70.833396] Code: 00 48 89 e5 5d 48 8b 40 c8 48 c1 e8 02 83 e0 01 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 8b 87 c0 03 00 00 48 89 e5 <48> 8b 40 d8 5d c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 [ 70.833396] RIP [<ffffffff8108ff90>] kthread_data+0x10/0x20 [ 70.833396] RSP <ffff88003a14d9c0> [ 70.833396] CR2: ffffffffffffffd8 [ 70.833396] ---[ end trace c5387a4b27c41668 ]--- [ 70.833396] Fixing recursive fault but reboot is needed! 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