================================================================== BUG: KASAN: use-after-free in tcp_retransmit_timer+0x2fb8/0x3450 net/ipv4/tcp_timer.c:511 Read of size 8 at addr ffff8880176ab5d8 by task swapper/0/0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.13.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:436 tcp_retransmit_timer+0x2fb8/0x3450 net/ipv4/tcp_timer.c:511 tcp_write_timer_handler+0x5b8/0xb00 net/ipv4/tcp_timer.c:622 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:642 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1431 expire_timers kernel/time/timer.c:1476 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1745 __run_timers kernel/time/timer.c:1726 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1758 __do_softirq+0x29b/0x9f6 kernel/softirq.c:559 invoke_softirq kernel/softirq.c:433 [inline] __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline] RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:132 [inline] RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline] RIP: 0010:acpi_idle_do_entry+0x1c9/0x250 drivers/acpi/processor_idle.c:513 Code: ed 91 5b f8 84 db 75 ac e8 34 8b 5b f8 e8 ef 9a 61 f8 e9 0c 00 00 00 e8 25 8b 5b f8 0f 00 2d ee 28 b5 00 e8 19 8b 5b f8 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 24 93 5b f8 48 85 db RSP: 0018:ffffffff8bc07d60 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffffffff8bcbc540 RSI: ffffffff891950d7 RDI: 0000000000000000 RBP: ffff888141fcf864 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff817aebe8 R11: 0000000000000000 R12: 0000000000000001 R13: ffff888141fcf800 R14: ffff888141fcf864 R15: ffff88801b405804 acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:648 cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:158 [inline] cpuidle_idle_call kernel/sched/idle.c:239 [inline] do_idle+0x3e8/0x590 kernel/sched/idle.c:306 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403 start_kernel+0x475/0x496 init/main.c:1087 secondary_startup_64_no_verify+0xb0/0xbb Allocated by task 9115: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:428 [inline] __kasan_slab_alloc+0x84/0xa0 mm/kasan/common.c:461 kasan_slab_alloc include/linux/kasan.h:236 [inline] slab_post_alloc_hook mm/slab.h:524 [inline] slab_alloc_node mm/slub.c:2914 [inline] slab_alloc mm/slub.c:2922 [inline] kmem_cache_alloc+0x219/0x3a0 mm/slub.c:2927 kmem_cache_zalloc include/linux/slab.h:676 [inline] net_alloc net/core/net_namespace.c:409 [inline] copy_net_ns+0x12a/0x760 net/core/net_namespace.c:461 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x8e0 kernel/fork.c:2996 __do_sys_unshare kernel/fork.c:3064 [inline] __se_sys_unshare kernel/fork.c:3062 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3062 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff8880176ab380 which belongs to the cache net_namespace of size 6336 The buggy address is located 600 bytes inside of 6336-byte region [ffff8880176ab380, ffff8880176acc40) The buggy address belongs to the page: page:ffffea00005daa00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880176ab380 pfn:0x176a8 head:ffffea00005daa00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001dc5a00 0000000200000002 ffff888143db3000 raw: ffff8880176ab380 0000000080040003 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 8457, ts 163756438233, free_ts 163743487587 prep_new_page mm/page_alloc.c:2358 [inline] get_page_from_freelist+0x1033/0x2b60 mm/page_alloc.c:3994 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5200 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272 alloc_slab_page mm/slub.c:1646 [inline] allocate_slab+0x2c5/0x4c0 mm/slub.c:1786 new_slab mm/slub.c:1849 [inline] new_slab_objects mm/slub.c:2595 [inline] ___slab_alloc+0x4a1/0x810 mm/slub.c:2758 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2798 slab_alloc_node mm/slub.c:2880 [inline] slab_alloc mm/slub.c:2922 [inline] kmem_cache_alloc+0x34b/0x3a0 mm/slub.c:2927 kmem_cache_zalloc include/linux/slab.h:676 [inline] net_alloc net/core/net_namespace.c:409 [inline] copy_net_ns+0x12a/0x760 net/core/net_namespace.c:461 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x8e0 kernel/fork.c:2996 __do_sys_unshare kernel/fork.c:3064 [inline] __se_sys_unshare kernel/fork.c:3062 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3062 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1298 [inline] __free_pages_ok+0x476/0xce0 mm/page_alloc.c:1572 unfreeze_partials+0x17c/0x1d0 mm/slub.c:2376 put_cpu_partial+0x13d/0x230 mm/slub.c:2412 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x8e/0xa0 mm/kasan/common.c:438 kasan_slab_alloc include/linux/kasan.h:236 [inline] slab_post_alloc_hook mm/slab.h:524 [inline] slab_alloc_node mm/slub.c:2914 [inline] slab_alloc mm/slub.c:2922 [inline] kmem_cache_alloc+0x219/0x3a0 mm/slub.c:2927 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags+0x9a/0xe0 include/linux/audit.h:319 getname fs/namei.c:209 [inline] __do_sys_rename fs/namei.c:4745 [inline] __se_sys_rename fs/namei.c:4743 [inline] __x64_sys_rename+0x65/0xa0 fs/namei.c:4743 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff8880176ab480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880176ab500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880176ab580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880176ab600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880176ab680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================