TCP: request_sock_TCPv6: Possible SYN flooding on port 20000. Sending cookies.  Check SNMP counters.
==================================================================
BUG: KASAN: slab-out-of-bounds in dns_resolver_preparse+0x910/0x9b0 net/dns_resolver/dns_key.c:127
Read of size 1 at addr ffff8880596d6414 by task syz-executor.6/70717

CPU: 0 PID: 70717 Comm: syz-executor.6 Not tainted 5.10.207 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x167 lib/dump_stack.c:118
 print_address_description.constprop.0+0x1c/0x220 mm/kasan/report.c:377
 __kasan_report mm/kasan/report.c:537 [inline]
 kasan_report.cold+0x37/0x7c mm/kasan/report.c:554
 dns_resolver_preparse+0x910/0x9b0 net/dns_resolver/dns_key.c:127
 key_create_or_update+0x3e0/0xc30 security/keys/key.c:859
 __do_sys_add_key+0x215/0x430 security/keys/keyctl.c:134
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x62/0xc7
RIP: 0033:0x7f59c01ddb19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f59bd753188 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8
RAX: ffffffffffffffda RBX: 00007f59c02f0f60 RCX: 00007f59c01ddb19
RDX: 0000000020000000 RSI: 0000000000000000 RDI: 0000000020000200
RBP: 00007f59c0237f6d R08: fffffffffffffffb R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdfdef805f R14: 00007f59bd753300 R15: 0000000000022000

Allocated by task 70717:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc9/0xd0 mm/kasan/common.c:461
 kmalloc_node include/linux/slab.h:575 [inline]
 kvmalloc_node+0x119/0x170 mm/util.c:607
 kvmalloc include/linux/mm.h:765 [inline]
 __do_sys_add_key+0x311/0x430 security/keys/keyctl.c:116
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x62/0xc7

The buggy address belongs to the object at ffff8880596d6410
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 4 bytes inside of
 8-byte region [ffff8880596d6410, ffff8880596d6418)
The buggy address belongs to the page:
page:00000000a865a180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x596d6
flags: 0x100000000000200(slab)
raw: 0100000000000200 ffffea000038f440 0000001400000014 ffff888008041c80
raw: 0000000000000000 0000000080660066 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880596d6300: fc fc fc fc fb fc fc fc fc fb fc fc fc fc fb fc
 ffff8880596d6380: fc fc fc fb fc fc fc fc fb fc fc fc fc fb fc fc
>ffff8880596d6400: fc fc 04 fc fc fc fc 00 fc fc fc fc 00 fc fc fc
                         ^
 ffff8880596d6480: fc 00 fc fc fc fc 00 fc fc fc fc 04 fc fc fc fc
 ffff8880596d6500: 04 fc fc fc fc 04 fc fc fc fc fa fc fc fc fc fa
==================================================================
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 70726 Comm: syz-executor.5 Tainted: G    B             5.10.207 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x167 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 should_failslab+0x5/0x20 mm/slab_common.c:1193
 slab_pre_alloc_hook mm/slab.h:515 [inline]
 slab_alloc_node mm/slub.c:2821 [inline]
 slab_alloc mm/slub.c:2904 [inline]
 kmem_cache_alloc+0x5b/0x310 mm/slub.c:2909
 mem_pool_alloc mm/kmemleak.c:423 [inline]
 create_object.isra.0+0x3a/0xa20 mm/kmemleak.c:578
 kmemleak_alloc_percpu+0xa0/0x100 mm/kmemleak.c:924
 pcpu_alloc+0x4e2/0x1240 mm/percpu.c:1842
 alloc_vfsmnt+0xfd/0x680 fs/namespace.c:192
 clone_mnt+0x6c/0xce0 fs/namespace.c:1039
 copy_tree+0x3b0/0xa60 fs/namespace.c:1860
 copy_mnt_ns+0x144/0xa00 fs/namespace.c:3339
 create_new_namespaces+0xd6/0xb20 kernel/nsproxy.c:78
 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:231
 ksys_unshare+0x449/0x8a0 kernel/fork.c:3003
 __do_sys_unshare kernel/fork.c:3071 [inline]
 __se_sys_unshare kernel/fork.c:3069 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3069
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x62/0xc7
RIP: 0033:0x7fe9f34b0b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe9f0a26188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fe9f35c3f60 RCX: 00007fe9f34b0b19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000048020200
RBP: 00007fe9f0a261d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffc38c474df R14: 00007fe9f0a26300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 71141 Comm: syz-executor.5 Tainted: G    B             5.10.207 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x167 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 should_failslab+0x5/0x20 mm/slab_common.c:1193
 slab_pre_alloc_hook mm/slab.h:515 [inline]
 slab_alloc_node mm/slub.c:2821 [inline]
 slab_alloc mm/slub.c:2904 [inline]
 kmem_cache_alloc+0x5b/0x310 mm/slub.c:2909
 kmem_cache_zalloc include/linux/slab.h:654 [inline]
 alloc_vfsmnt+0x23/0x680 fs/namespace.c:177
 clone_mnt+0x6c/0xce0 fs/namespace.c:1039
 copy_tree+0x3b0/0xa60 fs/namespace.c:1860
 copy_mnt_ns+0x144/0xa00 fs/namespace.c:3339
 create_new_namespaces+0xd6/0xb20 kernel/nsproxy.c:78
 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:231
 ksys_unshare+0x449/0x8a0 kernel/fork.c:3003
 __do_sys_unshare kernel/fork.c:3071 [inline]
 __se_sys_unshare kernel/fork.c:3069 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3069
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x62/0xc7
RIP: 0033:0x7fe9f34b0b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe9f0a26188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fe9f35c3f60 RCX: 00007fe9f34b0b19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000048020200
RBP: 00007fe9f0a261d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffc38c474df R14: 00007fe9f0a26300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 71449 Comm: syz-executor.5 Tainted: G    B             5.10.207 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x167 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 should_failslab+0x5/0x20 mm/slab_common.c:1193
 slab_pre_alloc_hook mm/slab.h:515 [inline]
 slab_alloc_node mm/slub.c:2821 [inline]
 slab_alloc mm/slub.c:2904 [inline]
 kmem_cache_alloc+0x5b/0x310 mm/slub.c:2909
 mem_pool_alloc mm/kmemleak.c:423 [inline]
 create_object.isra.0+0x3a/0xa20 mm/kmemleak.c:578
 kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
 slab_post_alloc_hook mm/slab.h:534 [inline]
 slab_alloc_node mm/slub.c:2896 [inline]
 slab_alloc mm/slub.c:2904 [inline]
 kmem_cache_alloc+0x159/0x310 mm/slub.c:2909
 kmem_cache_zalloc include/linux/slab.h:654 [inline]
 alloc_vfsmnt+0x23/0x680 fs/namespace.c:177
 clone_mnt+0x6c/0xce0 fs/namespace.c:1039
 copy_tree+0x3b0/0xa60 fs/namespace.c:1860
 copy_mnt_ns+0x144/0xa00 fs/namespace.c:3339
 create_new_namespaces+0xd6/0xb20 kernel/nsproxy.c:78
 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:231
 ksys_unshare+0x449/0x8a0 kernel/fork.c:3003
 __do_sys_unshare kernel/fork.c:3071 [inline]
 __se_sys_unshare kernel/fork.c:3069 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3069
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x62/0xc7
RIP: 0033:0x7fe9f34b0b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe9f0a26188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fe9f35c3f60 RCX: 00007fe9f34b0b19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000048020200
RBP: 00007fe9f0a261d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffc38c474df R14: 00007fe9f0a26300 R15: 0000000000022000