Node 1 Normal free:3513444kB min:53508kB low:66884kB high:80260kB active_anon:151060kB inactive_anon:824kB active_file:18580kB inactive_file:2776kB unevictable:0kB writepending:24kB present:3932160kB managed:3870192kB mlocked:0kB kernel_stack:3360kB pagetables:5280kB bounce:0kB free_pcp:1368kB local_pcp:704kB free_cma:0kB lowmem_reserve[]: 0 0 0 caif:caif_disconnect_client(): nothing to disconnect 0 ================================================================== BUG: KASAN: use-after-free in tw_timer_handler+0x124/0x150 net/ipv4/inet_timewait_sock.c:151 Read of size 8 at addr ffff888098a985f8 by task syz-executor.0/27197 CPU: 0 PID: 27197 Comm: syz-executor.0 Not tainted 4.14.158-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 tw_timer_handler+0x124/0x150 net/ipv4/inet_timewait_sock.c:151 call_timer_fn+0x161/0x670 kernel/time/timer.c:1279 expire_timers kernel/time/timer.c:1318 [inline] __run_timers kernel/time/timer.c:1636 [inline] __run_timers kernel/time/timer.c:1604 [inline] run_timer_softirq+0x5b7/0x1520 kernel/time/timer.c:1649 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x160/0x1b0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:console_unlock+0x9f8/0xed0 kernel/printk/printk.c:2405 RSP: 0018:ffff88801d2877a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc90006e34000 RDX: 0000000000040000 RSI: ffffffff814b5a72 RDI: 0000000000000246 RBP: ffff88801d287830 R08: ffff88801d2726c0 R09: ffff88801d272f88 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff83eb5930 R14: ffffffff8859e330 R15: dffffc0000000000 vprintk_emit kernel/printk/printk.c:1923 [inline] vprintk_emit+0x1f9/0x600 kernel/printk/printk.c:1888 vprintk_default+0x28/0x30 kernel/printk/printk.c:1963 vprintk_func+0x5d/0x159 kernel/printk/printk_safe.c:401 printk+0x9e/0xbc kernel/printk/printk.c:1996 show_free_areas.cold+0x1282/0x1379 mm/page_alloc.c:4810 show_mem+0x39/0x18b lib/show_mem.c:18 dump_header+0x1e1/0x6cd mm/oom_kill.c:426 oom_kill_process.cold+0x10/0xadd mm/oom_kill.c:861 out_of_memory mm/oom_kill.c:1084 [inline] out_of_memory+0x2ee/0x1180 mm/oom_kill.c:1023 pagefault_out_of_memory+0xc9/0xd7 mm/oom_kill.c:1115 mm_fault_error+0xb6/0x2c0 arch/x86/mm/fault.c:1048 __do_page_fault+0xa35/0xb80 arch/x86/mm/fault.c:1448 do_page_fault+0x71/0x511 arch/x86/mm/fault.c:1495 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1122 RIP: 0033:0x40940d RSP: 002b:00007fa02edd3070 EFLAGS: 00010202 RAX: 0000000000409400 RBX: 00007fa02edd4c90 RCX: 0000000000000000 RDX: 0000000020fe5000 RSI: 0000000000000006 RDI: 0000000000000003 RBP: 000000000075bf20 R08: fffffffffffffce3 R09: 0000000000000000 R10: 0000000000000064 R11: 0000000000000000 R12: 00007fa02edd56d4 R13: 00000000004cacaf R14: 00000000004e4180 R15: 0000000000000007 Allocated by task 8259: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x780 mm/slab.c:3552 kmem_cache_zalloc include/linux/slab.h:651 [inline] net_alloc net/core/net_namespace.c:362 [inline] copy_net_ns+0xfa/0x440 net/core/net_namespace.c:402 create_new_namespaces+0x37b/0x720 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xab/0x1e0 kernel/nsproxy.c:206 SYSC_unshare kernel/fork.c:2391 [inline] SyS_unshare+0x2f3/0x7e0 kernel/fork.c:2341 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 6024: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kmem_cache_free+0x83/0x2b0 mm/slab.c:3758 net_free net/core/net_namespace.c:378 [inline] net_drop_ns+0x6e/0x80 net/core/net_namespace.c:385 cleanup_net+0x4e9/0x870 net/core/net_namespace.c:502 process_one_work+0x863/0x1600 kernel/workqueue.c:2114 worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 The buggy address belongs to the object at ffff888098a98400 which belongs to the cache net_namespace of size 8832 The buggy address is located 504 bytes inside of 8832-byte region [ffff888098a98400, ffff888098a9a680) The buggy address belongs to the page: page:ffffea000262a600 count:1 mapcount:0 mapping:ffff888098a98400 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff888098a98400 0000000000000000 0000000100000001 raw: ffffea00023fc820 ffffea0001951720 ffff8880aa9e93c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888098a98480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888098a98500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888098a98580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888098a98600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888098a98680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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