On Tue, 30 Jul 2019 11:52:44 -0700 Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > (switched to email. Please respond via emailed reply-to-all, not via the > bugzilla web interface). > > > On Mon, 29 Jul 2019 22:35:48 +0000 bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote: > > > https://bugzilla.kernel.org/show_bug.cgi?id=204371 > > > > Bug ID: 204371 > > Summary: BUG kmalloc-4k (Tainted: G W ): Object > > padding overwritten > > Product: Memory Management > > Version: 2.5 > > Kernel Version: 5.3.0-rc2 > > Hardware: PPC-32 > > OS: Linux > > Tree: Mainline > > Status: NEW > > Severity: normal > > Priority: P1 > > Component: Slab Allocator > > Assignee: akpm@xxxxxxxxxxxxxxxxxxxx > > Reporter: erhard_f@xxxxxxxxxxx > > Regression: No > > cc'ing various people here. > > I suspect proc_cgroup_show() is innocent and that perhaps > bpf_prepare_filter() had a memory scribble. iirc there has been at > least one recent pretty serious bpf fix applied recently. Can others > please take a look? > > (Seriously - please don't modify this report via the bugzilla web interface!) Hm, don't know whether this is bpfs fault.. I am getting this for other things too: [...] Jul 31 10:46:53 T600 kernel: Object 442ee539: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Jul 31 10:46:53 T600 kernel: Object 41b83bb9: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkkkkkk. Jul 31 10:46:53 T600 kernel: Redzone 720e193a: bb bb bb bb .... Jul 31 10:46:53 T600 kernel: Padding 0b116c89: 00 00 00 00 00 00 00 00 ........ Jul 31 10:46:53 T600 kernel: CPU: 1 PID: 120 Comm: systemd-journal Tainted: G B W 5.2.4-gentoo #1 Jul 31 10:46:53 T600 kernel: Call Trace: Jul 31 10:46:53 T600 kernel: [dd663b68] [c0628d80] dump_stack+0xa0/0xfc (unreliable) Jul 31 10:46:53 T600 kernel: [dd663b98] [c01984ac] check_bytes_and_report+0xc8/0xf0 Jul 31 10:46:53 T600 kernel: [dd663bc8] [c0198fd0] check_object+0x10c/0x224 Jul 31 10:46:53 T600 kernel: [dd663bf8] [c0199964] alloc_debug_processing+0xc4/0x13c Jul 31 10:46:53 T600 kernel: [dd663c18] [c0199bc4] ___slab_alloc.constprop.72+0x1e8/0x380 Jul 31 10:46:53 T600 kernel: [dd663ca8] [c0199d9c] __slab_alloc.constprop.71+0x40/0x6c Jul 31 10:46:53 T600 kernel: [dd663cd8] [c019a014] kmem_cache_alloc_trace+0x7c/0x170 Jul 31 10:46:53 T600 kernel: [dd663d18] [c02d6a5c] btrfs_opendir+0x48/0x78 Jul 31 10:46:53 T600 kernel: [dd663d38] [c01a9320] do_dentry_open+0x25c/0x2f0 Jul 31 10:46:53 T600 kernel: [dd663d68] [c01bc284] path_openat+0x814/0xaf0 Jul 31 10:46:53 T600 kernel: [dd663e38] [c01bc5a4] do_filp_open+0x44/0xa0 Jul 31 10:46:53 T600 kernel: [dd663ee8] [c01aa178] do_sys_open+0x7c/0x108 Jul 31 10:46:53 T600 kernel: [dd663f38] [c0015274] ret_from_syscall+0x0/0x34 Jul 31 10:46:53 T600 kernel: --- interrupt: c00 at 0x7eae14 LR = 0x7eadf8 Jul 31 10:46:53 T600 kernel: FIX kmalloc-4k: Restoring 0x0b116c89-0x85f2eca1=0x5a [...] -- PGP-ID: 0x98891295 Fingerprint: 923B 911C 9366 E229 3149 9997 8922 516C 9889 1295 riot.im: @ernsteiswuerfel:matrix.org
