000000001c38a014: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ XFS (loop6): metadata I/O error in "xfs_trans_read_buf_map" at daddr 0x2 len 1 error 117 XFS (loop6): xfs_imap_lookup: xfs_ialloc_read_agi() returned error -117, agno 0 XFS (loop6): Failed to read root inode 0x80, error 117 ================================================================== BUG: KASAN: slab-out-of-bounds in find_first_bit+0xf7/0x100 lib/find_bit.c:107 ------------[ cut here ]------------ Read of size 8 at addr ffff8801d2d16290 by task kswapd0/1532 kernel BUG at mm/vmscan.c:593! invalid opcode: 0000 [#1] SMP KASAN CPU: 1 PID: 1532 Comm: kswapd0 Not tainted 4.18.0-rc3-next-20180709+ #2 CPU: 0 PID: 3738 Comm: syz-executor4 Not tainted 4.18.0-rc3-next-20180709+ #2 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 RIP: 0010:shrink_slab_memcg mm/vmscan.c:593 [inline] RIP: 0010:shrink_slab+0xb3e/0xdb0 mm/vmscan.c:672 Code: 8d a8 fd ff print_address_description+0x6c/0x20b mm/kasan/report.c:256 ff f0 48 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 0f __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 b3 08 find_first_bit+0xf7/0x100 lib/find_bit.c:107 e8 shrink_slab_memcg mm/vmscan.c:580 [inline] shrink_slab+0x5d0/0xdb0 mm/vmscan.c:672 ed b5 da ff 48 8b 85 c0 shrink_node+0x429/0x16a0 mm/vmscan.c:2736 fd ff ff c7 00 f8 f8 f8 f8 c6 40 kswapd_shrink_node mm/vmscan.c:3458 [inline] balance_pgdat+0x7ca/0x1010 mm/vmscan.c:3568 04 f8 e9 5d fb kswapd+0x82e/0x12f0 mm/vmscan.c:3790 ff ff e8 d2 b5 da ff <0f> 0b e8 cb b5 kthread+0x345/0x410 kernel/kthread.c:246 da ff 48 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 8b 9d Allocated by task 25345: d8 save_stack+0x43/0xd0 mm/kasan/kasan.c:448 fd set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __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 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 ff prealloc_memcg_shrinker mm/vmscan.c:185 [inline] prealloc_shrinker+0x29e/0x450 mm/vmscan.c:366 31 alloc_super+0x8dd/0xb10 fs/super.c:264 ff sget_userns+0x276/0x860 fs/super.c:615 48 sget+0x10b/0x150 fs/super.c:667 mount_nodev+0x38/0x120 fs/super.c:1393 89 ramfs_mount+0x34/0x40 fs/ramfs/inode.c:253 legacy_get_tree+0x118/0x440 fs/fs_context.c:659 de e8 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1751 ea do_new_mount fs/namespace.c:2567 [inline] do_mount+0x6c1/0x1fb0 fs/namespace.c:2889 b6 ksys_mount+0x12d/0x140 fs/namespace.c:3105 __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 entry_SYSCALL_64_after_hwframe+0x49/0xbe RSP: 0018:ffff88019626e260 EFLAGS: 00010246 Freed by task 24474: RAX: 0000000000040000 RBX: ffff88019626e4b0 RCX: ffffc90006a42000 save_stack+0x43/0xd0 mm/kasan/kasan.c:448 RDX: 0000000000040000 RSI: ffffffff81a1c48e RDI: 0000000000000007 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 RBP: ffff88019626e4d8 R08: ffff8801b1912700 R09: ffffed0039845740 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 R10: ffffed0039845740 R11: ffff8801cc22ba07 R12: dffffc0000000000 kvfree+0x61/0x70 mm/util.c:442 R13: ffff8801cc3131f0 R14: 0000000000000000 R15: ffff88019626e2f0 kvm_arch_free_memslot+0x85/0x270 arch/x86/kvm/x86.c:8872 FS: 00007fe277a66700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 kvm_free_memslot+0xb8/0x110 arch/x86/kvm/../../../virt/kvm/kvm_main.c:554 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa3e5d5e000 CR3: 00000001aadd1000 CR4: 00000000001406f0 kvm_free_memslots+0x99/0x100 arch/x86/kvm/../../../virt/kvm/kvm_main.c:567 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:749 [inline] kvm_put_kvm+0xa05/0x1060 arch/x86/kvm/../../../virt/kvm/kvm_main.c:767 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kvm_vm_release+0x42/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:778 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 __fput+0x35d/0x930 fs/file_table.c:215 ____fput+0x15/0x20 fs/file_table.c:251 Call Trace: task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:192 [inline] exit_to_usermode_loop+0x313/0x370 arch/x86/entry/common.c:166 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 ffff8801d2d16280 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 16 bytes inside of 32-byte region [ffff8801d2d16280, ffff8801d2d162a0) The buggy address belongs to the page: page:ffffea00074b4580 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801d2d16fc1 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00075ad208 ffffea00075c2e88 ffff8801da8001c0 raw: ffff8801d2d16fc1 ffff8801d2d16000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d2d16180: 07 fc fc fc fc fc fc fc 07 fc fc fc fc fc fc fc ffff8801d2d16200: 00 00 00 00 fc fc fc fc fb fb fb fb fc fc fc fc >ffff8801d2d16280: 00 00 07 fc fc fc fc fc 00 fc fc fc fc fc fc fc ^ ffff8801d2d16300: fb fb fb fb fc fc fc fc 00 00 06 fc fc fc fc fc ffff8801d2d16380: 00 03 fc fc fc fc fc fc fb fb fb fb fc fc fc fc 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