This bug is awaiting verification that the linux- azure-4.15/4.15.0-1157.172 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed-bionic'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-bionic-linux-azure-4.15 verification-needed-bionic -- 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/1989144 Title: unprivileged users may trigger page cache invalidation WARN Status in linux package in Ubuntu: Invalid Status in linux source package in Bionic: Fix Released Bug description: [Impact] Unprivileged users may trigger a page cache invalidation failure when doing parallel direct I/O and buffered I/O. On some kernels, that may lead to a WARN. [ 22.415082] WARNING: CPU: 3 PID: 3404 at /build/linux-GtMq7R/linux-4.15.0/fs/iomap.c:903 iomap_dio_actor+0xbd/0x460 [ 22.415083] Modules linked in: xfs isofs kvm_intel kvm irqbypass joydev input_leds serio_raw ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse ahci libahci virtio_blk virtio_net [ 22.415099] CPU: 3 PID: 3404 Comm: xfs_io Not tainted 4.15.0-192-generic #203-Ubuntu [ 22.415100] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014 [ 22.415103] RIP: 0010:iomap_dio_actor+0xbd/0x460 [ 22.415104] RSP: 0018:ffffb7c782fe7bf0 EFLAGS: 00010202 [ 22.415104] RAX: 0000000000000002 RBX: 0000000000000000 RCX: 0000000000000009 [ 22.415105] RDX: 00000000000001ff RSI: 0000000000000000 RDI: ffffb7c782fe7e20 [ 22.415105] RBP: ffffb7c782fe7c68 R08: ffffb7c782fe7c88 R09: ffff9bbc9f48fba0 [ 22.415106] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000009 [ 22.415106] R13: ffff9bbc9f48fba0 R14: ffffb7c782fe7c88 R15: 0000000000001000 [ 22.415107] FS: 00007f2b802ed700(0000) GS:ffff9bbcbfd80000(0000) knlGS:0000000000000000 [ 22.415107] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.415108] CR2: 0000000001639000 CR3: 000000001e6b0003 CR4: 0000000000760ee0 [ 22.415110] PKRU: 55555554 [ 22.415110] Call Trace: [ 22.415122] ? iomap_dio_zero+0x130/0x130 [ 22.415123] iomap_apply+0xa5/0x120 [ 22.415124] ? iomap_dio_zero+0x130/0x130 [ 22.415125] iomap_dio_rw+0x2f3/0x430 [ 22.415126] ? iomap_dio_zero+0x130/0x130 [ 22.415148] xfs_file_dio_aio_read+0x68/0xf0 [xfs] [ 22.415157] ? xfs_file_dio_aio_read+0x68/0xf0 [xfs] [ 22.415165] xfs_file_read_iter+0xbf/0xe0 [xfs] [ 22.415170] new_sync_read+0xe4/0x130 [ 22.415171] __vfs_read+0x29/0x40 [ 22.415172] vfs_read+0x8e/0x130 [ 22.415173] SyS_pread64+0x95/0xb0 [ 22.415176] do_syscall_64+0x73/0x130 [ 22.415183] entry_SYSCALL_64_after_hwframe+0x41/0xa6 [ 22.415184] RIP: 0033:0x7f2b7fbc0b73 [ 22.415185] RSP: 002b:00007ffc134e1a58 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 [ 22.415186] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2b7fbc0b73 [ 22.415186] RDX: 0000000000001000 RSI: 0000000001639000 RDI: 0000000000000003 [ 22.415186] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 22.415187] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc134e1b00 [ 22.415187] R13: 0000000000020000 R14: 0000000000000000 R15: 0000000000000000 [ 22.415188] Code: 21 d0 48 89 45 a0 0f 85 aa 03 00 00 41 0f b7 46 18 66 83 f8 03 0f 84 7e 02 00 00 66 83 f8 04 74 52 66 83 f8 01 0f 84 c8 02 00 00 <0f> 0b 48 c7 45 a0 fb ff ff ff 48 8b 5d d0 65 48 33 1c 25 28 00 [Test case] Run xfstests generic/446 test. [Potential regressions] Data corruption could be caused, though it is expected to be caused in such scenarions anyway. That should affecte direct I/O. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1989144/+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
