[syzbot] KASAN: use-after-free Read in hfsplus_release_folio
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syzbot
Dec 16, 2022, 11:59:47 PM12/16/22
to damien...@opensource.wdc.com, jla...@kernel.org, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, wi...@infradead.org
Hello,
syzbot found the following issue on:
HEAD commit: 830b3c68c1fb Linux 6.1
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11c5aa9d880000
kernel config: https://syzkaller.appspot.com/x/.config?x=5a194ed4fc682723
dashboard link: https://syzkaller.appspot.com/bug?extid=57e3e98f7e3b80f64d56
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d9a63f880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16335357880000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/955d55d85d6c/disk-830b3c68.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7ef0e1f6a0c3/vmlinux-830b3c68.xz
kernel image: https://storage.googleapis.com/syzbot-assets/27601eb5ff0b/bzImage-830b3c68.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/1cd85a260e69/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+57e3e9...@syzkaller.appspotmail.com
loop0: detected capacity change from 0 to 1024
==================================================================
BUG: KASAN: use-after-free in hfsplus_release_folio+0x497/0x560 fs/hfsplus/inode.c:92
Read of size 4 at addr ffff888027fe6038 by task syz-executor976/3639
CPU: 1 PID: 3639 Comm: syz-executor976 Not tainted 6.1.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
print_address_description+0x74/0x340 mm/kasan/report.c:284
print_report+0x107/0x1f0 mm/kasan/report.c:395
kasan_report+0xcd/0x100 mm/kasan/report.c:495
hfsplus_release_folio+0x497/0x560 fs/hfsplus/inode.c:92
block_invalidate_folio+0x661/0xa60 fs/buffer.c:1526
folio_invalidate mm/truncate.c:159 [inline]
truncate_cleanup_folio+0x1be/0x5c0 mm/truncate.c:179
truncate_inode_pages_range+0x2c8/0x17f0 mm/truncate.c:369
hfsplus_evict_inode+0x25/0xf0 fs/hfsplus/super.c:168
evict+0x2a4/0x620 fs/inode.c:664
hfsplus_put_super+0x207/0x320 fs/hfsplus/super.c:302
generic_shutdown_super+0x130/0x310 fs/super.c:492
kill_block_super+0x79/0xd0 fs/super.c:1428
deactivate_locked_super+0xa7/0xf0 fs/super.c:332
cleanup_mnt+0x494/0x520 fs/namespace.c:1186
task_work_run+0x243/0x300 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0x664/0x2070 kernel/exit.c:820
do_group_exit+0x1fd/0x2b0 kernel/exit.c:950
__do_sys_exit_group kernel/exit.c:961 [inline]
__se_sys_exit_group kernel/exit.c:959 [inline]
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:959
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fe998bb1cb9
Code: Unable to access opcode bytes at 0x7fe998bb1c8f.
RSP: 002b:00007ffd05507518 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fe998c273f0 RCX: 00007fe998bb1cb9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00000000000005f6
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe998c273f0
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
</TASK>
Allocated by task 3639:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x3d/0x60 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:371 [inline]
__kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380
kmalloc include/linux/slab.h:553 [inline]
kzalloc include/linux/slab.h:689 [inline]
hfsplus_btree_open+0x5a/0xd00 fs/hfsplus/btree.c:142
hfsplus_fill_super+0xa7b/0x1b50 fs/hfsplus/super.c:473
mount_bdev+0x26c/0x3a0 fs/super.c:1401
legacy_get_tree+0xea/0x180 fs/fs_context.c:610
vfs_get_tree+0x88/0x270 fs/super.c:1531
do_new_mount+0x289/0xad0 fs/namespace.c:3040
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed by task 3639:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x3d/0x60 mm/kasan/common.c:52
kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:511
____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1750
slab_free mm/slub.c:3661 [inline]
__kmem_cache_free+0x71/0x110 mm/slub.c:3674
hfsplus_put_super+0x1c7/0x320 fs/hfsplus/super.c:300
generic_shutdown_super+0x130/0x310 fs/super.c:492
kill_block_super+0x79/0xd0 fs/super.c:1428
deactivate_locked_super+0xa7/0xf0 fs/super.c:332
cleanup_mnt+0x494/0x520 fs/namespace.c:1186
task_work_run+0x243/0x300 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0x664/0x2070 kernel/exit.c:820
do_group_exit+0x1fd/0x2b0 kernel/exit.c:950
__do_sys_exit_group kernel/exit.c:961 [inline]
__se_sys_exit_group kernel/exit.c:959 [inline]
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:959
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The buggy address belongs to the object at ffff888027fe6000
which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 56 bytes inside of
4096-byte region [ffff888027fe6000, ffff888027fe7000)
The buggy address belongs to the physical page:
page:ffffea00009ff800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27fe0
head:ffffea00009ff800 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888012842140
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3639, tgid 3639 (syz-executor976), ts 50631674390, free_ts 50602085924
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4291
__alloc_pages+0x259/0x560 mm/page_alloc.c:5558
alloc_slab_page+0xbd/0x190 mm/slub.c:1794
allocate_slab+0x5e/0x4b0 mm/slub.c:1939
new_slab mm/slub.c:1992 [inline]
___slab_alloc+0x782/0xe20 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
__kmem_cache_alloc_node+0x252/0x310 mm/slub.c:3437
__do_kmalloc_node mm/slab_common.c:954 [inline]
__kmalloc+0x9e/0x1a0 mm/slab_common.c:968
kmalloc include/linux/slab.h:558 [inline]
tomoyo_realpath_from_path+0xcd/0x5f0 security/tomoyo/realpath.c:251
tomoyo_mount_acl security/tomoyo/mount.c:141 [inline]
tomoyo_mount_permission+0x972/0xa90 security/tomoyo/mount.c:237
security_sb_mount+0x70/0xd0 security/security.c:979
path_mount+0xbd/0x10c0 fs/namespace.c:3312
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1459 [inline]
free_pcp_prepare+0x80c/0x8f0 mm/page_alloc.c:1509
free_unref_page_prepare mm/page_alloc.c:3387 [inline]
free_unref_page+0x7d/0x5f0 mm/page_alloc.c:3483
free_slab mm/slub.c:2031 [inline]
discard_slab mm/slub.c:2037 [inline]
__unfreeze_partials+0x1ab/0x200 mm/slub.c:2586
put_cpu_partial+0x106/0x170 mm/slub.c:2662
qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:302
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slab.h:737 [inline]
slab_alloc_node mm/slub.c:3398 [inline]
__kmem_cache_alloc_node+0x1d7/0x310 mm/slub.c:3437
kmalloc_trace+0x26/0x60 mm/slab_common.c:1045
kmalloc include/linux/slab.h:553 [inline]
kzalloc include/linux/slab.h:689 [inline]
kset_create lib/kobject.c:937 [inline]
kset_create_and_add+0x55/0x280 lib/kobject.c:980
register_queue_kobjects net/core/net-sysfs.c:1766 [inline]
netdev_register_kobject+0x1a2/0x310 net/core/net-sysfs.c:2019
register_netdevice+0x1043/0x1790 net/core/dev.c:10057
register_netdev+0x37/0x50 net/core/dev.c:10183
ip6_tnl_init_net+0x22a/0x350 net/ipv6/ip6_tunnel.c:2257
ops_init+0x34e/0x5c0 net/core/net_namespace.c:135
setup_net+0x4bb/0xc10 net/core/net_namespace.c:332
Memory state around the buggy address:
ffff888027fe5f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888027fe5f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888027fe6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888027fe6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888027fe6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot found the following issue on:
HEAD commit: 830b3c68c1fb Linux 6.1
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11c5aa9d880000
kernel config: https://syzkaller.appspot.com/x/.config?x=5a194ed4fc682723
dashboard link: https://syzkaller.appspot.com/bug?extid=57e3e98f7e3b80f64d56
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d9a63f880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16335357880000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/955d55d85d6c/disk-830b3c68.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7ef0e1f6a0c3/vmlinux-830b3c68.xz
kernel image: https://storage.googleapis.com/syzbot-assets/27601eb5ff0b/bzImage-830b3c68.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/1cd85a260e69/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+57e3e9...@syzkaller.appspotmail.com
loop0: detected capacity change from 0 to 1024
==================================================================
BUG: KASAN: use-after-free in hfsplus_release_folio+0x497/0x560 fs/hfsplus/inode.c:92
Read of size 4 at addr ffff888027fe6038 by task syz-executor976/3639
CPU: 1 PID: 3639 Comm: syz-executor976 Not tainted 6.1.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
print_address_description+0x74/0x340 mm/kasan/report.c:284
print_report+0x107/0x1f0 mm/kasan/report.c:395
kasan_report+0xcd/0x100 mm/kasan/report.c:495
hfsplus_release_folio+0x497/0x560 fs/hfsplus/inode.c:92
block_invalidate_folio+0x661/0xa60 fs/buffer.c:1526
folio_invalidate mm/truncate.c:159 [inline]
truncate_cleanup_folio+0x1be/0x5c0 mm/truncate.c:179
truncate_inode_pages_range+0x2c8/0x17f0 mm/truncate.c:369
hfsplus_evict_inode+0x25/0xf0 fs/hfsplus/super.c:168
evict+0x2a4/0x620 fs/inode.c:664
hfsplus_put_super+0x207/0x320 fs/hfsplus/super.c:302
generic_shutdown_super+0x130/0x310 fs/super.c:492
kill_block_super+0x79/0xd0 fs/super.c:1428
deactivate_locked_super+0xa7/0xf0 fs/super.c:332
cleanup_mnt+0x494/0x520 fs/namespace.c:1186
task_work_run+0x243/0x300 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0x664/0x2070 kernel/exit.c:820
do_group_exit+0x1fd/0x2b0 kernel/exit.c:950
__do_sys_exit_group kernel/exit.c:961 [inline]
__se_sys_exit_group kernel/exit.c:959 [inline]
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:959
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fe998bb1cb9
Code: Unable to access opcode bytes at 0x7fe998bb1c8f.
RSP: 002b:00007ffd05507518 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fe998c273f0 RCX: 00007fe998bb1cb9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00000000000005f6
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe998c273f0
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
</TASK>
Allocated by task 3639:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x3d/0x60 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:371 [inline]
__kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380
kmalloc include/linux/slab.h:553 [inline]
kzalloc include/linux/slab.h:689 [inline]
hfsplus_btree_open+0x5a/0xd00 fs/hfsplus/btree.c:142
hfsplus_fill_super+0xa7b/0x1b50 fs/hfsplus/super.c:473
mount_bdev+0x26c/0x3a0 fs/super.c:1401
legacy_get_tree+0xea/0x180 fs/fs_context.c:610
vfs_get_tree+0x88/0x270 fs/super.c:1531
do_new_mount+0x289/0xad0 fs/namespace.c:3040
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed by task 3639:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x3d/0x60 mm/kasan/common.c:52
kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:511
____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1750
slab_free mm/slub.c:3661 [inline]
__kmem_cache_free+0x71/0x110 mm/slub.c:3674
hfsplus_put_super+0x1c7/0x320 fs/hfsplus/super.c:300
generic_shutdown_super+0x130/0x310 fs/super.c:492
kill_block_super+0x79/0xd0 fs/super.c:1428
deactivate_locked_super+0xa7/0xf0 fs/super.c:332
cleanup_mnt+0x494/0x520 fs/namespace.c:1186
task_work_run+0x243/0x300 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0x664/0x2070 kernel/exit.c:820
do_group_exit+0x1fd/0x2b0 kernel/exit.c:950
__do_sys_exit_group kernel/exit.c:961 [inline]
__se_sys_exit_group kernel/exit.c:959 [inline]
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:959
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The buggy address belongs to the object at ffff888027fe6000
which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 56 bytes inside of
4096-byte region [ffff888027fe6000, ffff888027fe7000)
The buggy address belongs to the physical page:
page:ffffea00009ff800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27fe0
head:ffffea00009ff800 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888012842140
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3639, tgid 3639 (syz-executor976), ts 50631674390, free_ts 50602085924
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4291
__alloc_pages+0x259/0x560 mm/page_alloc.c:5558
alloc_slab_page+0xbd/0x190 mm/slub.c:1794
allocate_slab+0x5e/0x4b0 mm/slub.c:1939
new_slab mm/slub.c:1992 [inline]
___slab_alloc+0x782/0xe20 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
__kmem_cache_alloc_node+0x252/0x310 mm/slub.c:3437
__do_kmalloc_node mm/slab_common.c:954 [inline]
__kmalloc+0x9e/0x1a0 mm/slab_common.c:968
kmalloc include/linux/slab.h:558 [inline]
tomoyo_realpath_from_path+0xcd/0x5f0 security/tomoyo/realpath.c:251
tomoyo_mount_acl security/tomoyo/mount.c:141 [inline]
tomoyo_mount_permission+0x972/0xa90 security/tomoyo/mount.c:237
security_sb_mount+0x70/0xd0 security/security.c:979
path_mount+0xbd/0x10c0 fs/namespace.c:3312
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1459 [inline]
free_pcp_prepare+0x80c/0x8f0 mm/page_alloc.c:1509
free_unref_page_prepare mm/page_alloc.c:3387 [inline]
free_unref_page+0x7d/0x5f0 mm/page_alloc.c:3483
free_slab mm/slub.c:2031 [inline]
discard_slab mm/slub.c:2037 [inline]
__unfreeze_partials+0x1ab/0x200 mm/slub.c:2586
put_cpu_partial+0x106/0x170 mm/slub.c:2662
qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:302
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slab.h:737 [inline]
slab_alloc_node mm/slub.c:3398 [inline]
__kmem_cache_alloc_node+0x1d7/0x310 mm/slub.c:3437
kmalloc_trace+0x26/0x60 mm/slab_common.c:1045
kmalloc include/linux/slab.h:553 [inline]
kzalloc include/linux/slab.h:689 [inline]
kset_create lib/kobject.c:937 [inline]
kset_create_and_add+0x55/0x280 lib/kobject.c:980
register_queue_kobjects net/core/net-sysfs.c:1766 [inline]
netdev_register_kobject+0x1a2/0x310 net/core/net-sysfs.c:2019
register_netdevice+0x1043/0x1790 net/core/dev.c:10057
register_netdev+0x37/0x50 net/core/dev.c:10183
ip6_tnl_init_net+0x22a/0x350 net/ipv6/ip6_tunnel.c:2257
ops_init+0x34e/0x5c0 net/core/net_namespace.c:135
setup_net+0x4bb/0xc10 net/core/net_namespace.c:332
Memory state around the buggy address:
ffff888027fe5f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888027fe5f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888027fe6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888027fe6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888027fe6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot can test patches for this issue, for details see:
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