================================================================== BUG: KASAN: use-after-free in perf_trace_lock_acquire+0x66b/0x800 include/trace/events/lock.h:13 Read of size 8 at addr ffff8881ccbd0310 by task syz-executor2/7399 CPU: 1 PID: 7399 Comm: syz-executor2 Not tainted 4.20.0-rc7+ #163 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+0x1d3/0x2c6 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 perf_trace_lock_acquire+0x66b/0x800 include/trace/events/lock.h:13 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x385/0x520 kernel/locking/lockdep.c:3843 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0x166/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 blkdev_get+0x5ed/0xb50 fs/block_dev.c:1623 blkdev_get_by_dev+0x3f/0x80 fs/block_dev.c:1739 journal_init_dev fs/reiserfs/journal.c:2628 [inline] journal_init+0xc96/0x6a10 fs/reiserfs/journal.c:2775 reiserfs_fill_super+0xd2b/0x3900 fs/reiserfs/super.c:2034 mount_bdev+0x30c/0x3e0 fs/super.c:1158 get_super_block+0x34/0x40 fs/reiserfs/super.c:2605 mount_fs+0xae/0x31d fs/super.c:1261 vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x581/0x31f0 fs/namespace.c:2801 ksys_mount+0x12d/0x140 fs/namespace.c:3017 __do_sys_mount fs/namespace.c:3031 [inline] __se_sys_mount fs/namespace.c:3028 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3028 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a0da Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 7d 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 5a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f159f41ba88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f159f41bb30 RCX: 000000000045a0da RDX: 00007f159f41bad0 RSI: 0000000020000100 RDI: 00007f159f41baf0 RBP: 0000000020000100 R08: 00007f159f41bb30 R09: 00007f159f41bad0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000005 R13: 0000000000000000 R14: 00000000004d9c60 R15: 00000000ffffffff Allocated by task 7399: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x730 mm/slab.c:3554 bdev_alloc_inode+0x1b/0x40 fs/block_dev.c:730 alloc_inode+0x63/0x190 fs/inode.c:210 iget5_locked+0x124/0x1c0 fs/inode.c:1126 bdget+0xb7/0x5b0 fs/block_dev.c:871 blkdev_get_by_dev+0x24/0x80 fs/block_dev.c:1735 journal_init_dev fs/reiserfs/journal.c:2628 [inline] journal_init+0xc96/0x6a10 fs/reiserfs/journal.c:2775 reiserfs_fill_super+0xd2b/0x3900 fs/reiserfs/super.c:2034 mount_bdev+0x30c/0x3e0 fs/super.c:1158 get_super_block+0x34/0x40 fs/reiserfs/super.c:2605 mount_fs+0xae/0x31d fs/super.c:1261 vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x581/0x31f0 fs/namespace.c:2801 ksys_mount+0x12d/0x140 fs/namespace.c:3017 __do_sys_mount fs/namespace.c:3031 [inline] __se_sys_mount fs/namespace.c:3028 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3028 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 32032: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x83/0x290 mm/slab.c:3760 bdev_i_callback+0x20/0x30 fs/block_dev.c:741 __rcu_reclaim kernel/rcu/rcu.h:240 [inline] rcu_do_batch kernel/rcu/tree.c:2437 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2716 [inline] rcu_process_callbacks+0x100a/0x1ac0 kernel/rcu/tree.c:2697 __do_softirq+0x30c/0xb2e kernel/softirq.c:292 The buggy address belongs to the object at ffff8881ccbd0280 which belongs to the cache bdev_cache(49:syz2) of size 1336 The buggy address is located 144 bytes inside of 1336-byte region [ffff8881ccbd0280, ffff8881ccbd07b8) The buggy address belongs to the page: page:ffffea000732f400 count:1 mapcount:0 mapping:ffff8881b62644c0 index:0xffff8881ccbd0ffe flags: 0x2fffc0000000200(slab) raw: 02fffc0000000200 ffffea0005a96ec8 ffffea0005d09908 ffff8881b62644c0 raw: ffff8881ccbd0ffe ffff8881ccbd0280 0000000100000002 ffff8881d90de200 page dumped because: kasan: bad access detected page->mem_cgroup:ffff8881d90de200 Memory state around the buggy address: ffff8881ccbd0200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881ccbd0280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881ccbd0300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881ccbd0380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881ccbd0400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================