loop0: rw=0, want=576460752303423532, limit=2048 loop2: rw=0, want=576460752303423532, limit=2048 attempt to access beyond end of device loop0: rw=0, want=576460752303423532, limit=2048 ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369 Read of size 8 at addr ffff888093d9cd60 by task syz-executor352/8495 CPU: 1 PID: 8495 Comm: syz-executor352 Not tainted 4.14.296-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:160 try_to_wake_up+0x6a/0x1100 kernel/sched/core.c:2000 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319 __run_timers kernel/time/timer.c:1637 [inline] run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1650 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:638 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:console_unlock+0xbeb/0xf20 kernel/printk/printk.c:2417 RSP: 0018:ffff8880aaff74b8 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff10 RAX: ffff88809ca66440 RBX: 0000000000000200 RCX: 1ffff1101394cdb1 RDX: 0000000000000000 RSI: ffff88809ca66d68 RDI: 0000000000000297 RBP: 0000000000000000 R08: ffffffff8b9c84a8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff83d25990 R13: ffffffff8961e210 R14: dffffc0000000000 R15: 0000000000000040 vprintk_emit+0x224/0x620 kernel/printk/printk.c:1925 vprintk_func+0x58/0x160 kernel/printk/printk_safe.c:409 printk+0x9e/0xbc kernel/printk/printk.c:1998 handle_bad_sector+0x13b/0x161 block/blk-core.c:1940 bio_check_eod block/blk-core.c:2034 [inline] generic_make_request_checks.cold+0x12/0x6a block/blk-core.c:2052 generic_make_request+0x67/0x850 block/blk-core.c:2185 submit_bio+0x234/0x390 block/blk-core.c:2303 mpage_bio_submit fs/mpage.c:66 [inline] do_mpage_readpage+0xeb0/0x1470 fs/mpage.c:302 mpage_readpage+0x10b/0x1e0 fs/mpage.c:411 do_read_cache_page+0x38e/0xc10 mm/filemap.c:2713 read_mapping_page include/linux/pagemap.h:398 [inline] nilfs_get_page.isra.0+0x72/0x8c0 fs/nilfs2/dir.c:201 nilfs_add_link+0x1e3/0xea0 fs/nilfs2/dir.c:471 nilfs_add_nondir fs/nilfs2/namei.c:46 [inline] nilfs_symlink+0x1fb/0x350 fs/nilfs2/namei.c:168 vfs_symlink+0x3ce/0x620 fs/namei.c:4158 SYSC_symlinkat fs/namei.c:4185 [inline] SyS_symlinkat+0x1dc/0x240 fs/namei.c:4165 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7ff8b54ebc79 RSP: 002b:00007fffda94bea8 EFLAGS: 00000246 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007ff8b54ebc79 RDX: 0000000020000780 RSI: 0000000000000003 RDI: 00000000200001c0 RBP: 0000000000000000 R08: 00007fffda94bed0 R09: 00007fffda94bed0 R10: 000055555719c2c0 R11: 0000000000000246 R12: 00007fffda94becc R13: 00007fffda94bf00 R14: 00007fffda94bee0 R15: 0000000000000012 Allocated by task 2: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 kmem_cache_alloc_node+0x146/0x410 mm/slab.c:3642 alloc_task_struct_node kernel/fork.c:156 [inline] dup_task_struct kernel/fork.c:515 [inline] copy_process.part.0+0x17d3/0x71c0 kernel/fork.c:1631 copy_process kernel/fork.c:1606 [inline] _do_fork+0x184/0xc80 kernel/fork.c:2092 kernel_thread+0x2f/0x40 kernel/fork.c:2154 create_kthread kernel/kthread.c:255 [inline] kthreadd+0x51a/0x770 kernel/kthread.c:592 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Freed by task 1: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kmem_cache_free+0x7c/0x2b0 mm/slab.c:3758 __put_task_struct+0x276/0x470 kernel/fork.c:420 put_task_struct include/linux/sched/task.h:98 [inline] delayed_put_task_struct+0x1fb/0x2e0 kernel/exit.c:180 __rcu_reclaim kernel/rcu/rcu.h:195 [inline] rcu_do_batch kernel/rcu/tree.c:2699 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline] rcu_process_callbacks+0x780/0x1180 kernel/rcu/tree.c:2946 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 The buggy address belongs to the object at ffff888093d9c580 which belongs to the cache task_struct of size 6144 The buggy address is located 2016 bytes inside of 6144-byte region [ffff888093d9c580, ffff888093d9dd80) The buggy address belongs to the page: page:ffffea00024f6700 count:1 mapcount:0 mapping:ffff888093d9c580 index:0xffff888093d9c580 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff888093d9c580 ffff888093d9c580 0000000100000000 raw: ffffea0002af4ea0 ffffea00024e0320 ffff88823f8307c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888093d9cc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888093d9cc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888093d9cd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888093d9cd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888093d9ce00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================