EXT4-fs (loop4): can't read group descriptor 0 ================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:188 [inline] BUG: KASAN: use-after-free in list_empty include/linux/list.h:203 [inline] BUG: KASAN: use-after-free in shrink_slab_memcg mm/vmscan.c:595 [inline] BUG: KASAN: use-after-free in shrink_slab+0xa04/0xa60 mm/vmscan.c:671 Read of size 8 at addr ffff880194ddb3d8 by task syz-executor2/5892 CPU: 1 PID: 5892 Comm: syz-executor2 Not tainted 4.18.0-rc4-next-20180713+ #7 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 binder: 5860:5897 unknown command 587276491 binder: 5860:5897 ioctl c0306201 200000c0 returned -22 print_address_description+0x6c/0x20b mm/kasan/report.c:256 binder: 5860:5897 got reply transaction with no transaction stack 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 __read_once_size include/linux/compiler.h:188 [inline] list_empty include/linux/list.h:203 [inline] shrink_slab_memcg mm/vmscan.c:595 [inline] shrink_slab+0xa04/0xa60 mm/vmscan.c:671 binder: 5860:5897 transaction failed 29201/-71, size 0-0 line 2759 shrink_node+0x429/0x16a0 mm/vmscan.c:2735 shrink_zones mm/vmscan.c:2964 [inline] do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3026 try_to_free_mem_cgroup_pages+0x49d/0xc90 mm/vmscan.c:3324 binder_alloc: binder_alloc_mmap_handler: 5860 20001000-20004000 already mapped failed -16 binder: BINDER_SET_CONTEXT_MGR already set binder_alloc: 5860: binder_alloc_buf, no vma binder: 5860:5898 transaction failed 29189/-3, size 0-0 line 2967 memory_high_write+0x283/0x310 mm/memcontrol.c:5611 binder: 5860:5897 ioctl 40046207 0 returned -16 cgroup_file_write+0x31f/0x840 kernel/cgroup/cgroup.c:3502 binder: 5860:5898 unknown command 587276491 binder: 5860:5898 ioctl c0306201 200000c0 returned -22 kernfs_fop_write+0x2ba/0x480 fs/kernfs/file.c:316 binder: 5860:5897 got reply transaction with no transaction stack __vfs_write+0x117/0x9d0 fs/read_write.c:485 binder: 5860:5897 transaction failed 29201/-71, size 0-0 line 2759 binder: undelivered TRANSACTION_ERROR: 29201 binder: send failed reply for transaction 1753 to 5860:5862 vfs_write+0x1fc/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 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:00007f6abfa3bc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f6abfa3c6d4 RCX: 0000000000455ab9 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000016 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c2c77 R14: 00000000004d4c80 R15: 0000000000000000 Allocated by task 4070: 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 mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc_array include/linux/slab.h:635 [inline] kcalloc include/linux/slab.h:646 [inline] iter_file_splice_write+0x25d/0x1010 fs/splice.c:693 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 Freed by task 4070: 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 iter_file_splice_write+0x78d/0x1010 fs/splice.c:777 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 The buggy address belongs to the object at ffff880194ddb3c0 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 24 bytes inside of 256-byte region [ffff880194ddb3c0, ffff880194ddb4c0) The buggy address belongs to the page: page:ffffea00065376c0 count:1 mapcount:0 mapping:ffff8801da8007c0 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0007528d48 ffffea000709aec8 ffff8801da8007c0 raw: 0000000000000000 ffff880194ddb000 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff880194ddb280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880194ddb300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff880194ddb380: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff880194ddb400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880194ddb480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 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