** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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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 Committed
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.
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