netlink: 6 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 6 bytes leftover after parsing attributes in process `syz-executor2'. FAT-fs (loop3): Unrecognized mount option "xfs" or missing value XFS (loop3): Invalid superblock magic number ================================================================== BUG: KASAN: slab-out-of-bounds in find_first_bit+0xf7/0x100 lib/find_bit.c:107 Read of size 8 at addr ffff8801a39992d0 by task kswapd0/1532 ------------[ cut here ]------------ kernel BUG at mm/vmscan.c:593! CPU: 1 PID: 1532 Comm: kswapd0 Not tainted 4.18.0-rc3-next-20180706+ #1 invalid opcode: 0000 [#1] SMP KASAN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: CPU: 0 PID: 3981 Comm: syz-executor4 Not tainted 4.18.0-rc3-next-20180706+ #1 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:shrink_slab_memcg mm/vmscan.c:593 [inline] RIP: 0010:shrink_slab+0xb3e/0xdb0 mm/vmscan.c:672 Code: 8d a8 print_address_description+0x6c/0x20b mm/kasan/report.c:256 fd ff ff kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 f0 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 48 find_first_bit+0xf7/0x100 lib/find_bit.c:107 0f shrink_slab_memcg mm/vmscan.c:580 [inline] shrink_slab+0x5d0/0xdb0 mm/vmscan.c:672 b3 08 e8 3d b8 da ff shrink_node+0x429/0x16a0 mm/vmscan.c:2736 48 8b 85 c0 fd ff ff c7 00 kswapd_shrink_node mm/vmscan.c:3458 [inline] balance_pgdat+0x7ca/0x1010 mm/vmscan.c:3568 f8 f8 f8 f8 kswapd+0x82e/0x12f0 mm/vmscan.c:3790 c6 40 04 f8 e9 5d fb ff ff e8 22 kthread+0x345/0x410 kernel/kthread.c:246 b8 da ff <0f> ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 0b e8 Allocated by task 5048: 1b save_stack+0x43/0xd0 mm/kasan/kasan.c:448 b8 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 da __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3689 ff kmalloc_node include/linux/slab.h:555 [inline] kvmalloc_node+0x65/0xf0 mm/util.c:423 48 kvmalloc include/linux/mm.h:557 [inline] memcg_expand_one_shrinker_map mm/memcontrol.c:341 [inline] memcg_expand_shrinker_maps+0x1b1/0x3c0 mm/memcontrol.c:416 8b prealloc_memcg_shrinker mm/vmscan.c:185 [inline] prealloc_shrinker+0x29e/0x450 mm/vmscan.c:366 9d alloc_super+0x8dd/0xb10 fs/super.c:264 d8 sget_userns+0x276/0x860 fs/super.c:615 fd sget+0x10b/0x150 fs/super.c:667 ff mount_nodev+0x38/0x120 fs/super.c:1393 ff shmem_mount+0x34/0x40 mm/shmem.c:3655 31 legacy_get_tree+0x118/0x440 fs/fs_context.c:659 ff vfs_get_tree+0x1cb/0x5c0 fs/super.c:1751 48 do_new_mount fs/namespace.c:2567 [inline] do_mount+0x6c1/0x1fb0 fs/namespace.c:2889 89 ksys_mount+0x12d/0x140 fs/namespace.c:3105 de __do_sys_mount fs/namespace.c:3119 [inline] __se_sys_mount fs/namespace.c:3116 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3116 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 e8 entry_SYSCALL_64_after_hwframe+0x49/0xbe 3a b9 Freed by task 3668: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 RSP: 0018:ffff88019ec56260 EFLAGS: 00010293 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 RAX: ffff880198658000 RBX: ffff88019ec564b0 RCX: ffffffff81a1bf32 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 RDX: 0000000000000000 RSI: ffffffff81a1c23e RDI: 0000000000000007 single_release+0x8f/0xb0 fs/seq_file.c:596 RBP: ffff88019ec564d8 R08: ffff880198658000 R09: ffffed00399f5e40 close_pdeo.part.2+0x126/0x490 fs/proc/inode.c:175 R10: ffffed00399f5e40 R11: ffff8801ccfaf207 R12: dffffc0000000000 close_pdeo+0x168/0x1d0 fs/proc/inode.c:167 R13: ffff8801cc3111f0 R14: 0000000000000000 R15: ffff88019ec562f0 proc_reg_release+0x120/0x160 fs/proc/inode.c:394 FS: 0000000001022940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 __fput+0x35d/0x930 fs/file_table.c:215 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000863fd0 CR3: 00000001cd549000 CR4: 00000000001406f0 ____fput+0x15/0x20 fs/file_table.c:251 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 tracehook_notify_resume include/linux/tracehook.h:192 [inline] exit_to_usermode_loop+0x313/0x370 arch/x86/entry/common.c:166 Call Trace: prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801a39992c0 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 16 bytes inside of 32-byte region [ffff8801a39992c0, ffff8801a39992e0) The buggy address belongs to the page: page:ffffea00068e6640 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801a3999fc1 shrink_node+0x429/0x16a0 mm/vmscan.c:2736 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00065f1d88 ffffea000760c188 ffff8801da8001c0 raw: ffff8801a3999fc1 ffff8801a3999000 000000010000000a 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801a3999180: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801a3999200: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >ffff8801a3999280: 00 00 06 fc fc fc fc fc 00 00 06 fc fc fc fc fc ^ shrink_zones mm/vmscan.c:2965 [inline] do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3027 ffff8801a3999300: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801a3999380: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================