================================================================== BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:360 [inline] BUG: KASAN: use-after-free in tcp_write_timer_handler+0x8c6/0x8d0 net/ipv4/tcp_timer.c:596 Read of size 4 at addr ffff88808e820610 by task blkid/28466 CPU: 1 PID: 28466 Comm: blkid Not tainted 5.2.0+ #97 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482 kasan_report+0x12/0x17 mm/kasan/common.c:612 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131 tcp_probe_timer net/ipv4/tcp_timer.c:360 [inline] tcp_write_timer_handler+0x8c6/0x8d0 net/ipv4/tcp_timer.c:596 tcp_write_timer+0xa8/0x1e0 net/ipv4/tcp_timer.c:612 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1095 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:828 RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:25 [inline] RIP: 0010:do_memsw_account mm/memcontrol.c:93 [inline] RIP: 0010:mem_cgroup_commit_charge+0x1b8/0x490 mm/memcontrol.c:6152 Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 50 02 00 00 48 83 3d f5 86 20 07 00 0f 84 fc 01 00 00 fb 66 0f 1f 44 00 00 <0f> 1f 44 00 00 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 df RSP: 0000:ffff8880679d7c98 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11a5e04 RBX: 0000000000000000 RCX: 0000000000000006 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff888069c9890c RBP: ffff8880679d7cd0 R08: 1ffffffff14a7742 R09: fffffbfff14a7743 R10: fffffbfff14a7742 R11: ffffffff8a53ba17 R12: ffff88821b6eaac0 R13: ffffea0001417d48 R14: 0000000000000001 R15: ffffea0001417d40 do_anonymous_page mm/memory.c:3031 [inline] handle_pte_fault mm/memory.c:3838 [inline] __handle_mm_fault+0x2165/0x3f20 mm/memory.c:3964 handle_mm_fault+0x1b5/0x6b0 mm/memory.c:4001 do_user_addr_fault arch/x86/mm/fault.c:1444 [inline] __do_page_fault+0x536/0xdd0 arch/x86/mm/fault.c:1510 do_page_fault+0x71/0x5e1 arch/x86/mm/fault.c:1541 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1182 RIP: 0033:0x7fc8e83fdaad Code: 00 00 48 89 54 24 08 e8 31 60 ff ff 48 85 c0 49 89 c4 48 8b 54 24 08 0f 84 e0 01 00 00 4e 8d b4 30 68 04 00 00 48 8b 74 24 10 <49> 89 44 24 28 49 8d 4e 08 49 8d 7e 20 4c 89 b0 c8 02 00 00 48 89 RSP: 002b:00007ffcee180650 EFLAGS: 00010206 RAX: 00007fc8e860b000 RBX: 00007fc8e8611e60 RCX: 00007fc8e860b495 RDX: 000000000000000d RSI: 00007fc8e81cec22 RDI: 0000000000000000 RBP: 00007fc8e86114c8 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000000022 R11: 0000000000000246 R12: 00007fc8e860b000 R13: 0000000000000000 R14: 00007fc8e860b468 R15: 0000000000000000 Allocated by task 27946: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:487 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:460 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:495 slab_post_alloc_hook mm/slab.h:520 [inline] slab_alloc mm/slab.c:3319 [inline] kmem_cache_alloc+0x121/0x710 mm/slab.c:3483 getname_flags fs/namei.c:138 [inline] getname_flags+0xd6/0x5b0 fs/namei.c:128 getname+0x1a/0x20 fs/namei.c:209 __do_sys_execve fs/exec.c:1961 [inline] __se_sys_execve fs/exec.c:1956 [inline] __x64_sys_execve+0x73/0xc0 fs/exec.c:1956 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 27946: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:449 kasan_slab_free+0xe/0x10 mm/kasan/common.c:457 __cache_free mm/slab.c:3425 [inline] kmem_cache_free+0x86/0x320 mm/slab.c:3693 putname+0xef/0x130 fs/namei.c:259 __do_execve_file.isra.0+0x1b5d/0x2340 fs/exec.c:1835 do_execveat_common fs/exec.c:1868 [inline] do_execve fs/exec.c:1885 [inline] __do_sys_execve fs/exec.c:1961 [inline] __se_sys_execve fs/exec.c:1956 [inline] __x64_sys_execve+0x8f/0xc0 fs/exec.c:1956 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808e8204c0 which belongs to the cache names_cache of size 4096 The buggy address is located 336 bytes inside of 4096-byte region [ffff88808e8204c0, ffff88808e8214c0) The buggy address belongs to the page: page:ffffea00023a0800 refcount:1 mapcount:0 mapping:ffff88821bc46380 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00019b9488 ffffea000273be88 ffff88821bc46380 raw: 0000000000000000 ffff88808e8204c0 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808e820500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808e820580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808e820600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808e820680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808e820700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================