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** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: xenial
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https://bugs.launchpad.net/bugs/1756099
Title:
general protection fault in __d_lookup
Status in linux package in Ubuntu:
Incomplete
Bug description:
Found one of my VMs with dmesg many such traces:
general protection fault: 0000 [#1] SMP
Modules linked in: ip6table_filter ip6_tables xt_tcpudp xt_conntrack
iptable_filter ip_tables x_tables zfs(PO) zunicode(PO) zcommon(PO) znvpair(PO)
spl(O) zavl(PO) input_leds sch_fq_codel nf_conntrack_ipv
CPU: 0 PID: 5110 Comm: sshd Tainted: P O 4.4.0-116-generic
#140-Ubuntu
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
Ubuntu-1.8.2-1ubuntu1 04/01/2014
task: ffff88007867e600 ti: ffff8800787d8000 task.ti: ffff8800787d8000
RIP: 0010:[<ffffffff8922da28>] [<ffffffff8922da28>] __d_lookup+0x68/0x150
RSP: 0018:ffff8800787dbc00 EFLAGS: 00010206
RAX: ffffc900000659b8 RBX: 0020000000000000 RCX: 000000000000000e
RDX: ffffc90000007000 RSI: ffff8800787dbd40 RDI: ffff88006bc06300
RBP: ffff8800787dbc40 R08: ffff88006bc06300 R09: ffff88006b1ca01d
R10: 00000000c2223581 R11: 8080808080808080 R12: ffff88006bc06300
R13: ffff8800787dbd40 R14: 000000006cdac1d0 R15: ffff8800793a8020
FS: 00007f43b8a238c0(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561b09c1aed8 CR3: 0000000074498000 CR4: 0000000000000670
Stack:
ffffffff8922b3d4 ffff88006b1ca039 0000000c00000000 ffff8800787dbd30
0000000000000000 ffff8800787dbcb8 ffff8800787dbcb0 ffff8800793a8020
ffff8800787dbc98 ffffffff8921ed04 ffff88006b1ca039 ffff8800787dbcac
Call Trace:
[<ffffffff8922b3d4>] ? dput+0x34/0x230
[<ffffffff8921ed04>] lookup_fast+0xe4/0x340
[<ffffffff8921e488>] ? __inode_permission+0x48/0xc0
[<ffffffff89220549>] walk_component+0x49/0x310
[<ffffffff8921ff3b>] ? path_init+0x1eb/0x3c0
[<ffffffff892220ad>] path_lookupat+0x5d/0x110
[<ffffffff892225a4>] ? path_openat+0x1b4/0x1340
[<ffffffff89223d01>] filename_lookup+0xb1/0x180
[<ffffffff891f2109>] ? kmem_cache_alloc+0x189/0x1f0
[<ffffffff89223906>] ? getname_flags+0x56/0x1f0
[<ffffffff89223ea6>] user_path_at_empty+0x36/0x40
[<ffffffff89218d76>] vfs_fstatat+0x66/0xc0
[<ffffffff891b8aed>] ? kzfree+0x2d/0x40
[<ffffffff89219331>] SYSC_newlstat+0x31/0x60
[<ffffffff89212e7f>] ? do_sys_open+0x1bf/0x2a0
[<ffffffff8921946e>] SyS_newlstat+0xe/0x10
[<ffffffff8984efc8>] entry_SYSCALL_64_fastpath+0x1c/0xbb
Code: 45 c8 48 89 f8 48 c1 e8 06 44 01 f0 69 c0 01 00 37 9e d3 e8 48 8d 04 c2
48 8b 18 48 83 e3 fe 75 0a eb 32 48 8b 1b 48 85 db 74 2a <44> 3b 73 18 75 f2 4c
8d 7b 50 4c 89 ff e8 86 12 62 00 4c 3b 63
RIP [<ffffffff8922da28>] __d_lookup+0x68/0x150
RSP <ffff8800787dbc00>
---[ end trace d60d4c228fda67f5 ]---
The problem was apparently triggered by a SFTP transfer to the VM and
files were (tentatively) saved to a ZFS mount. This has been working
for over a year and it's the first time I see such traces.
I don't know if that matters but the VM also suffered from one
occurrence of LP: #1749715 a month ago and under different conditions.
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