================================================================== BUG: KASAN: slab-out-of-bounds in find_first_bit+0xf7/0x100 lib/find_bit.c:107 Read of size 8 at addr ffff8801d6b2af10 by task syz-executor1/7223 CPU: 0 PID: 7223 Comm: syz-executor1 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: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 find_first_bit+0xf7/0x100 lib/find_bit.c:107 shrink_slab_memcg mm/vmscan.c:580 [inline] shrink_slab+0x5d0/0xdb0 mm/vmscan.c:672 shrink_node+0x429/0x16a0 mm/vmscan.c:2736 shrink_zones mm/vmscan.c:2965 [inline] do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3027 try_to_free_mem_cgroup_pages+0x49d/0xc90 mm/vmscan.c:3325 memory_high_write+0x283/0x310 mm/memcontrol.c:5597 cgroup_file_write+0x31f/0x840 kernel/cgroup/cgroup.c:3500 kernfs_fop_write+0x2ba/0x480 fs/kernfs/file.c:316 __vfs_write+0x117/0x9f0 fs/read_write.c:485 __kernel_write+0x10c/0x370 fs/read_write.c:506 write_pipe_buf+0x181/0x240 fs/splice.c:798 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x38e/0x7c0 fs/splice.c:627 splice_from_pipe+0x1ea/0x340 fs/splice.c:662 default_file_splice_write+0x3c/0x90 fs/splice.c:810 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x128/0x190 fs/splice.c:1019 splice_direct_to_actor+0x318/0x8f0 fs/splice.c:974 do_splice_direct+0x2d4/0x420 fs/splice.c:1062 do_sendfile+0x62a/0xe20 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1495 [inline] __se_sys_sendfile64 fs/read_write.c:1487 [inline] __x64_sys_sendfile64+0x15d/0x250 fs/read_write.c:1487 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455e29 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fbfcfac0c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fbfcfac16d4 RCX: 0000000000455e29 RDX: 0000000020000040 RSI: 0000000000000014 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c1113 R14: 00000000004d1540 R15: 0000000000000000 Allocated by task 4476: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 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 kmalloc_node include/linux/slab.h:555 [inline] kvmalloc_node+0x65/0xf0 mm/util.c:423 kvmalloc include/linux/mm.h:557 [inline] kvzalloc include/linux/mm.h:565 [inline] memcg_alloc_shrinker_maps mm/memcontrol.c:386 [inline] mem_cgroup_css_online+0x169/0x3c0 mm/memcontrol.c:4685 online_css+0x10c/0x350 kernel/cgroup/cgroup.c:4768 css_create kernel/cgroup/cgroup.c:4839 [inline] cgroup_apply_control_enable+0x777/0xe90 kernel/cgroup/cgroup.c:2987 cgroup_mkdir+0x88a/0x1170 kernel/cgroup/cgroup.c:5029 kernfs_iop_mkdir+0x159/0x1e0 fs/kernfs/dir.c:1099 vfs_mkdir+0x42e/0x6b0 fs/namei.c:3874 do_mkdirat+0x27b/0x310 fs/namei.c:3897 __do_sys_mkdir fs/namei.c:3913 [inline] __se_sys_mkdir fs/namei.c:3911 [inline] __x64_sys_mkdir+0x5c/0x80 fs/namei.c:3911 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 1: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 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 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 acpi_os_free include/acpi/platform/aclinuxex.h:62 [inline] acpi_ns_evaluate+0x97f/0x9bc drivers/acpi/acpica/nseval.c:296 acpi_evaluate_object+0x48c/0x8cf drivers/acpi/acpica/nsxfeval.c:354 acpi_evaluate_integer+0x129/0x280 drivers/acpi/utils.c:296 acpi_find_child_device+0x1f3/0x320 drivers/acpi/glue.c:129 acpi_pci_find_companion+0x11a/0x150 drivers/pci/pci-acpi.c:714 acpi_platform_notify+0x73/0x1e0 drivers/acpi/glue.c:309 device_add+0x3f7/0x16f0 drivers/base/core.c:1865 pci_device_add+0x5f8/0xa90 drivers/pci/probe.c:2336 pci_scan_single_device+0x237/0x340 drivers/pci/probe.c:2354 pci_scan_slot+0x13a/0x3e0 drivers/pci/probe.c:2433 pci_scan_child_bus_extend+0x5f/0x680 drivers/pci/probe.c:2650 pci_scan_child_bus+0x17/0x20 drivers/pci/probe.c:2780 acpi_pci_root_create+0x899/0xb1b drivers/acpi/pci_root.c:922 pci_acpi_scan_root+0x63a/0x850 arch/x86/pci/acpi.c:368 acpi_pci_root_add.cold.7+0x14b/0xcd5 drivers/acpi/pci_root.c:606 acpi_scan_attach_handler drivers/acpi/scan.c:1928 [inline] acpi_bus_attach+0x3c1/0x9b0 drivers/acpi/scan.c:1972 acpi_bus_attach+0x1aa/0x9b0 drivers/acpi/scan.c:1993 acpi_bus_attach+0x1aa/0x9b0 drivers/acpi/scan.c:1993 acpi_bus_scan+0xeb/0x170 drivers/acpi/scan.c:2045 acpi_scan_init+0x403/0x8fe drivers/acpi/scan.c:2198 acpi_init+0x941/0xa19 drivers/acpi/bus.c:1284 do_one_initcall+0x127/0x913 init/main.c:884 do_initcall_level init/main.c:952 [inline] do_initcalls init/main.c:960 [inline] do_basic_setup init/main.c:978 [inline] kernel_init_freeable+0x49b/0x58e init/main.c:1135 kernel_init+0x11/0x1b3 init/main.c:1061 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 The buggy address belongs to the object at ffff8801d6b2af00 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 16 bytes inside of 32-byte region [ffff8801d6b2af00, ffff8801d6b2af20) The buggy address belongs to the page: page:ffffea00075aca80 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801d6b2afc1 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00075ac988 ffffea00075acbc8 ffff8801da8001c0 raw: ffff8801d6b2afc1 ffff8801d6b2a000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d6b2ae00: 00 06 fc fc fc fc fc fc fb fb fb fb fc fc fc fc ffff8801d6b2ae80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >ffff8801d6b2af00: 00 00 05 fc fc fc fc fc 00 00 00 fc fc fc fc fc ^ ffff8801d6b2af80: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801d6b2b000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================