==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x2ef3/0x3360 net/ipv4/tcp_timer.c:511
Read of size 8 at addr ffff88801fb802c0 by task syz-executor.4/10484

CPU: 0 PID: 10484 Comm: syz-executor.4 Not tainted 5.18.0-rc3-syzkaller-01612-g70a1b25326dd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313
 print_report mm/kasan/report.c:429 [inline]
 kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
 tcp_retransmit_timer+0x2ef3/0x3360 net/ipv4/tcp_timer.c:511
 tcp_write_timer_handler+0x5e6/0xbc0 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:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x679/0xa80 kernel/time/timer.c:1737
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1750
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 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:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:switchdev_lower_dev_walk+0x0/0x140 net/switchdev/switchdev.c:392
Code: 54 d3 50 00 5b e9 c0 6d 5c f8 e8 bb 6d 5c f8 48 8b 3d 94 97 7c 07 e9 5f f4 0b fa cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <41> 56 41 55 41 54 49 89 fc 55 53 48 89 f3 e8 8d 6d 5c f8 48 8d 7b
RSP: 0018:ffffc90004b6f548 EFLAGS: 00000212
RAX: ffffffff891cbfc0 RBX: ffff888068cf2000 RCX: ffffc90014ba2000
RDX: 0000000000040000 RSI: ffffc90004b6f728 RDI: ffff888068cf2000
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff891ce5c4 R11: 0000000000000000 R12: ffff88805a15dfa0
R13: ffff888068cf20b0 R14: 0000000000000000 R15: ffff888068cf2000
 netdev_walk_all_lower_dev+0xba/0x340 net/core/dev.c:7111
 switchdev_lower_dev_find net/switchdev/switchdev.c:448 [inline]
 __switchdev_handle_port_obj_del+0x3e4/0x490 net/switchdev/switchdev.c:706
 switchdev_handle_port_obj_del_foreign+0x30/0x60 net/switchdev/switchdev.c:751
 dsa_slave_switchdev_blocking_event+0x8c/0x120 net/dsa/slave.c:2981
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:84
 blocking_notifier_call_chain kernel/notifier.c:319 [inline]
 blocking_notifier_call_chain+0x67/0x90 kernel/notifier.c:307
 call_switchdev_blocking_notifiers net/switchdev/switchdev.c:377 [inline]
 switchdev_port_obj_notify+0xaf/0x160 net/switchdev/switchdev.c:207
 switchdev_port_obj_del_now net/switchdev/switchdev.c:266 [inline]
 switchdev_port_obj_del net/switchdev/switchdev.c:306 [inline]
 switchdev_port_obj_del+0x87/0x170 net/switchdev/switchdev.c:300
 br_switchdev_port_vlan_del+0x9a/0xd0 net/bridge/br_switchdev.c:185
 __vlan_vid_del net/bridge/br_vlan.c:152 [inline]
 __vlan_del+0x6dc/0xa50 net/bridge/br_vlan.c:400
 __vlan_flush+0x10d/0x2c0 net/bridge/br_vlan.c:459
 nbp_vlan_flush+0x93/0x200 net/bridge/br_vlan.c:1362
 del_nbp+0x3c6/0xd20 net/bridge/br_if.c:346
 br_dev_delete+0x95/0x190 net/bridge/br_if.c:376
 br_del_bridge+0xb7/0xf0 net/bridge/br_if.c:485
 br_ioctl_stub+0x36d/0x7d0 net/bridge/br_ioctl.c:428
 br_ioctl_call+0x5e/0xa0 net/socket.c:1096
 sock_ioctl+0x30c/0x640 net/socket.c:1193
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f00cc0890e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f00caffe168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f00cc19bf60 RCX: 00007f00cc0890e9
RDX: 0000000020000080 RSI: 00000000000089a1 RDI: 000000000000000e
RBP: 00007f00cc0e308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffde45cc7f R14: 00007f00caffe300 R15: 0000000000022000
 </TASK>

Allocated by task 3605:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:436 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:749 [inline]
 slab_alloc_node mm/slub.c:3217 [inline]
 slab_alloc mm/slub.c:3225 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3232 [inline]
 kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3242
 kmem_cache_zalloc include/linux/slab.h:704 [inline]
 net_alloc net/core/net_namespace.c:403 [inline]
 copy_net_ns+0x125/0x760 net/core/net_namespace.c:458
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
 ksys_unshare+0x445/0x920 kernel/fork.c:3132
 __do_sys_unshare kernel/fork.c:3203 [inline]
 __se_sys_unshare kernel/fork.c:3201 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3201
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348
 insert_work+0x48/0x350 kernel/workqueue.c:1358
 __queue_work+0x62e/0x1140 kernel/workqueue.c:1517
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1461 [inline]
 __run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1737
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0x152/0x1d0 kernel/time/timer.c:1752
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558

Second to last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348
 insert_work+0x48/0x350 kernel/workqueue.c:1358
 __queue_work+0x62e/0x1140 kernel/workqueue.c:1517
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1461 [inline]
 __run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1737
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0x152/0x1d0 kernel/time/timer.c:1752
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558

The buggy address belongs to the object at ffff88801fb80000
 which belongs to the cache net_namespace of size 6784
The buggy address is located 704 bytes inside of
 6784-byte region [ffff88801fb80000, ffff88801fb81a80)

The buggy address belongs to the physical page:
page:ffffea00007ee000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801fb80000 pfn:0x1fb80
head:ffffea00007ee000 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff888068c3ea01
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888010dcd3c0
raw: ffff88801fb80000 0000000080040000 00000001ffffffff ffff888068c3ea01
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 3605, tgid 3605 (syz-executor.0), ts 48230007126, free_ts 47205215395
 prep_new_page mm/page_alloc.c:2441 [inline]
 get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4182
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408
 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272
 alloc_slab_page mm/slub.c:1799 [inline]
 allocate_slab+0x26c/0x3c0 mm/slub.c:1944
 new_slab mm/slub.c:2004 [inline]
 ___slab_alloc+0x8df/0xf20 mm/slub.c:3005
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3092
 slab_alloc_node mm/slub.c:3183 [inline]
 slab_alloc mm/slub.c:3225 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3232 [inline]
 kmem_cache_alloc+0x360/0x3b0 mm/slub.c:3242
 kmem_cache_zalloc include/linux/slab.h:704 [inline]
 net_alloc net/core/net_namespace.c:403 [inline]
 copy_net_ns+0x125/0x760 net/core/net_namespace.c:458
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
 ksys_unshare+0x445/0x920 kernel/fork.c:3132
 __do_sys_unshare kernel/fork.c:3203 [inline]
 __se_sys_unshare kernel/fork.c:3201 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3201
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 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:1356 [inline]
 free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406
 free_unref_page_prepare mm/page_alloc.c:3328 [inline]
 free_unref_page+0x19/0x6a0 mm/page_alloc.c:3423
 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2523
 qlink_free mm/kasan/quarantine.c:157 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:749 [inline]
 slab_alloc_node mm/slub.c:3217 [inline]
 slab_alloc mm/slub.c:3225 [inline]
 __kmalloc+0x200/0x350 mm/slub.c:4410
 kmalloc include/linux/slab.h:586 [inline]
 tomoyo_add_entry security/tomoyo/common.c:2022 [inline]
 tomoyo_supervisor+0xce6/0xf00 security/tomoyo/common.c:2094
 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline]
 tomoyo_path_permission security/tomoyo/file.c:587 [inline]
 tomoyo_path_permission+0x270/0x3a0 security/tomoyo/file.c:573
 tomoyo_check_open_permission+0x33e/0x380 security/tomoyo/file.c:777
 tomoyo_file_open security/tomoyo/tomoyo.c:311 [inline]
 tomoyo_file_open+0x9d/0xc0 security/tomoyo/tomoyo.c:306
 security_file_open+0x45/0xb0 security/security.c:1651
 do_dentry_open+0x349/0x11e0 fs/open.c:811
 do_open fs/namei.c:3476 [inline]
 path_openat+0x1c71/0x2910 fs/namei.c:3609
 do_filp_open+0x1aa/0x400 fs/namei.c:3636
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1213

Memory state around the buggy address:
 ffff88801fb80180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801fb80200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801fb80280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88801fb80300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801fb80380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	54                   	push   %rsp
   1:	d3 50 00             	rcll   %cl,0x0(%rax)
   4:	5b                   	pop    %rbx
   5:	e9 c0 6d 5c f8       	jmpq   0xf85c6dca
   a:	e8 bb 6d 5c f8       	callq  0xf85c6dca
   f:	48 8b 3d 94 97 7c 07 	mov    0x77c9794(%rip),%rdi        # 0x77c97aa
  16:	e9 5f f4 0b fa       	jmpq   0xfa0bf47a
  1b:	cc                   	int3
  1c:	cc                   	int3
  1d:	cc                   	int3
  1e:	cc                   	int3
  1f:	cc                   	int3
  20:	cc                   	int3
  21:	cc                   	int3
  22:	cc                   	int3
  23:	cc                   	int3
  24:	cc                   	int3
  25:	cc                   	int3
  26:	cc                   	int3
  27:	cc                   	int3
  28:	cc                   	int3
  29:	cc                   	int3
* 2a:	41 56                	push   %r14 <-- trapping instruction
  2c:	41 55                	push   %r13
  2e:	41 54                	push   %r12
  30:	49 89 fc             	mov    %rdi,%r12
  33:	55                   	push   %rbp
  34:	53                   	push   %rbx
  35:	48 89 f3             	mov    %rsi,%rbx
  38:	e8 8d 6d 5c f8       	callq  0xf85c6dca
  3d:	48                   	rex.W
  3e:	8d                   	.byte 0x8d
  3f:	7b                   	.byte 0x7b