==================================================================
BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:791 [inline]
BUG: KASAN: use-after-free in detach_timer kernel/time/timer.c:824 [inline]
BUG: KASAN: use-after-free in expire_timers kernel/time/timer.c:1482 [inline]
BUG: KASAN: use-after-free in __run_timers+0x7be/0xbe0 kernel/time/timer.c:1817
Write of size 8 at addr ffff8881df7071c8 by task syz.0.173/941

CPU: 0 PID: 941 Comm: syz.0.173 Not tainted 5.4.289-syzkaller-00011-g39762b7a60e9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x241 lib/dump_stack.c:118
 print_address_description+0x8c/0x600 mm/kasan/report.c:384
 __kasan_report+0xf3/0x120 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 __hlist_del include/linux/list.h:791 [inline]
 detach_timer kernel/time/timer.c:824 [inline]
 expire_timers kernel/time/timer.c:1482 [inline]
 __run_timers+0x7be/0xbe0 kernel/time/timer.c:1817
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x195/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:539 [inline]
 smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:unwind_next_frame+0x1681/0x1ea0 arch/x86/kernel/unwind_orc.c:579
Code: e8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 e8 07 00 00 49 0f bf 06 48 8b 74 24 08 48 01 c6 48 8d 53 40 48 89 df e8 3f 0a 00 00 <84> c0 0f 84 63 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24
RSP: 0018:ffff8881e938ee00 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff1103d271e01 RBX: ffff8881e938f100 RCX: c5f2793f156b2000
RDX: ffff8881e938f140 RSI: ffff8881e938ed80 RDI: ffff8881e938f6b0
RBP: ffff8881e938f0f0 R08: dffffc0000000000 R09: ffff8881e938f150
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffffffff0d10947
R13: ffffffff86884a3d R14: ffffffff86884a3c R15: dffffc0000000000
 arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2829 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842
 kmem_cache_zalloc include/linux/slab.h:680 [inline]
 __kernfs_new_node+0xdb/0x6e0 fs/kernfs/dir.c:639
 kernfs_new_node+0x130/0x230 fs/kernfs/dir.c:717
 kernfs_create_dir_ns+0x3f/0x120 fs/kernfs/dir.c:1041
 sysfs_create_dir_ns+0x185/0x390 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:89 [inline]
 kobject_add_internal+0x6b7/0xca0 lib/kobject.c:263
 kobject_add_varg lib/kobject.c:398 [inline]
 kobject_init_and_add+0x120/0x190 lib/kobject.c:481
 rx_queue_add_kobject net/core/net-sysfs.c:977 [inline]
 net_rx_queue_update_kobjects+0x156/0x420 net/core/net-sysfs.c:1010
 netif_set_real_num_rx_queues+0xfc/0x1e0 net/core/dev.c:2639
 tun_set_real_num_queues drivers/net/tun.c:652 [inline]
 tun_attach+0x10fb/0x14b0 drivers/net/tun.c:906
 tun_set_iff+0x45c/0xdc0 drivers/net/tun.c:2847
 __tun_chr_ioctl+0x8a9/0x1d00 drivers/net/tun.c:3187
 do_vfs_ioctl+0x742/0x1720 fs/ioctl.c:47
 ksys_ioctl fs/ioctl.c:742 [inline]
 __do_sys_ioctl fs/ioctl.c:749 [inline]
 __se_sys_ioctl fs/ioctl.c:747 [inline]
 __x64_sys_ioctl+0xd4/0x110 fs/ioctl.c:747
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f5b22667169
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5b20cd1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5b2287ffa0 RCX: 00007f5b22667169
RDX: 0000400000000040 RSI: 00000000400454ca RDI: 0000000000000007
RBP: 00007f5b226e82a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5b2287ffa0 R15: 00007fff204398a8

Allocated by task 357:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2829 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842
 shmem_alloc_inode+0x16/0x30 mm/shmem.c:3719
 alloc_inode fs/inode.c:231 [inline]
 new_inode_pseudo+0x60/0x210 fs/inode.c:966
 new_inode+0x25/0x1d0 fs/inode.c:995
 shmem_get_inode+0x10b/0x620 mm/shmem.c:2252
 shmem_mknod+0x54/0x1a0 mm/shmem.c:2844
 lookup_open fs/namei.c:3379 [inline]
 do_last fs/namei.c:3471 [inline]
 path_openat+0x184a/0x34b0 fs/namei.c:3683
 do_filp_open+0x20b/0x450 fs/namei.c:3713
 do_sys_open+0x39c/0x810 fs/open.c:1123
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Freed by task 17:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 kasan_set_free_info mm/kasan/common.c:345 [inline]
 __kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487
 slab_free_hook mm/slub.c:1455 [inline]
 slab_free_freelist_hook mm/slub.c:1494 [inline]
 slab_free mm/slub.c:3080 [inline]
 kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096
 __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
 rcu_do_batch+0x492/0xa00 kernel/rcu/tree.c:2167
 rcu_core+0x4c8/0xcb0 kernel/rcu/tree.c:2387
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292

The buggy address belongs to the object at ffff8881df707090
 which belongs to the cache shmem_inode_cache of size 760
The buggy address is located 312 bytes inside of
 760-byte region [ffff8881df707090, ffff8881df707388)
The buggy address belongs to the page:
page:ffffea00077dc100 refcount:1 mapcount:0 mapping:ffff8881f5cff400 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5cff400
raw: 0000000000000000 0000000000120012 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x18f/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893
 alloc_slab_page+0x39/0x3c0 mm/slub.c:343
 allocate_slab mm/slub.c:1683 [inline]
 new_slab+0x97/0x440 mm/slub.c:1749
 new_slab_objects mm/slub.c:2505 [inline]
 ___slab_alloc+0x2fe/0x490 mm/slub.c:2667
 __slab_alloc+0x62/0xa0 mm/slub.c:2707
 slab_alloc_node mm/slub.c:2792 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0x109/0x250 mm/slub.c:2842
 shmem_alloc_inode+0x16/0x30 mm/shmem.c:3719
 alloc_inode fs/inode.c:231 [inline]
 new_inode_pseudo+0x60/0x210 fs/inode.c:966
 new_inode+0x25/0x1d0 fs/inode.c:995
 shmem_get_inode+0x10b/0x620 mm/shmem.c:2252
 shmem_symlink+0x118/0x5f0 mm/shmem.c:3068
 vfs_symlink+0x36c/0x500 fs/namei.c:4276
 do_symlinkat+0x19b/0x400 fs/namei.c:4303
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 __free_pages_ok+0x847/0x950 mm/page_alloc.c:1438
 free_the_page mm/page_alloc.c:4955 [inline]
 __free_pages mm/page_alloc.c:4961 [inline]
 free_pages+0xf6/0x1b0 mm/page_alloc.c:4969
 stack_depot_save+0x42b/0x480 lib/stackdepot.c:300
 save_stack mm/kasan/common.c:72 [inline]
 set_track mm/kasan/common.c:78 [inline]
 kasan_set_free_info mm/kasan/common.c:345 [inline]
 __kasan_slab_free+0x21c/0x270 mm/kasan/common.c:487
 slab_free_hook mm/slub.c:1455 [inline]
 slab_free_freelist_hook mm/slub.c:1494 [inline]
 slab_free mm/slub.c:3080 [inline]
 kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096
 netlink_broadcast_filtered+0x115f/0x1280 net/netlink/af_netlink.c:1516
 netlink_broadcast net/netlink/af_netlink.c:1538 [inline]
 nlmsg_multicast include/net/netlink.h:968 [inline]
 nlmsg_notify+0xf7/0x1b0 net/netlink/af_netlink.c:2510
 inet6_rt_notify+0x3c8/0x550 net/ipv6/route.c:6000
 fib6_del_route net/ipv6/ip6_fib.c:1893 [inline]
 fib6_del+0x9a3/0xc20 net/ipv6/ip6_fib.c:1926
 fib6_clean_node+0x2ed/0x550 net/ipv6/ip6_fib.c:2088
 fib6_walk_continue+0x4c7/0x6e0 net/ipv6/ip6_fib.c:2010
 fib6_walk+0x164/0x2b0 net/ipv6/ip6_fib.c:2058
 fib6_clean_tree net/ipv6/ip6_fib.c:2138 [inline]
 __fib6_clean_all net/ipv6/ip6_fib.c:2154 [inline]
 fib6_clean_all+0x20c/0x2d0 net/ipv6/ip6_fib.c:2165
 rt6_sync_down_dev net/ipv6/route.c:4776 [inline]
 rt6_disable_ip+0x160/0x730 net/ipv6/route.c:4781
 addrconf_ifdown+0x191/0x1a90 net/ipv6/addrconf.c:3775
 addrconf_notify+0x375/0xe50 net/ipv6/addrconf.c:3698

Memory state around the buggy address:
 ffff8881df707080: fc fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881df707100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881df707180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff8881df707200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881df707280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1d526d067 P4D 1d526d067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 941 Comm: syz.0.173 Tainted: G    B             5.4.289-syzkaller-00011-g39762b7a60e9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010002
RAX: ffffffff8154e8aa RBX: 0000000000000101 RCX: ffff8881e8815e80
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881df7071c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154e4ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa378
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881df7071c0
FS:  00007f5b20cd16c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e63ef000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
 expire_timers kernel/time/timer.c:1488 [inline]
 __run_timers+0x8a5/0xbe0 kernel/time/timer.c:1817
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x195/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:539 [inline]
 smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:unwind_next_frame+0x1681/0x1ea0 arch/x86/kernel/unwind_orc.c:579
Code: e8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 e8 07 00 00 49 0f bf 06 48 8b 74 24 08 48 01 c6 48 8d 53 40 48 89 df e8 3f 0a 00 00 <84> c0 0f 84 63 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24
RSP: 0018:ffff8881e938ee00 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff1103d271e01 RBX: ffff8881e938f100 RCX: c5f2793f156b2000
RDX: ffff8881e938f140 RSI: ffff8881e938ed80 RDI: ffff8881e938f6b0
RBP: ffff8881e938f0f0 R08: dffffc0000000000 R09: ffff8881e938f150
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffffffff0d10947
R13: ffffffff86884a3d R14: ffffffff86884a3c R15: dffffc0000000000
 arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2829 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842
 kmem_cache_zalloc include/linux/slab.h:680 [inline]
 __kernfs_new_node+0xdb/0x6e0 fs/kernfs/dir.c:639
 kernfs_new_node+0x130/0x230 fs/kernfs/dir.c:717
 kernfs_create_dir_ns+0x3f/0x120 fs/kernfs/dir.c:1041
 sysfs_create_dir_ns+0x185/0x390 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:89 [inline]
 kobject_add_internal+0x6b7/0xca0 lib/kobject.c:263
 kobject_add_varg lib/kobject.c:398 [inline]
 kobject_init_and_add+0x120/0x190 lib/kobject.c:481
 rx_queue_add_kobject net/core/net-sysfs.c:977 [inline]
 net_rx_queue_update_kobjects+0x156/0x420 net/core/net-sysfs.c:1010
 netif_set_real_num_rx_queues+0xfc/0x1e0 net/core/dev.c:2639
 tun_set_real_num_queues drivers/net/tun.c:652 [inline]
 tun_attach+0x10fb/0x14b0 drivers/net/tun.c:906
 tun_set_iff+0x45c/0xdc0 drivers/net/tun.c:2847
 __tun_chr_ioctl+0x8a9/0x1d00 drivers/net/tun.c:3187
 do_vfs_ioctl+0x742/0x1720 fs/ioctl.c:47
 ksys_ioctl fs/ioctl.c:742 [inline]
 __do_sys_ioctl fs/ioctl.c:749 [inline]
 __se_sys_ioctl fs/ioctl.c:747 [inline]
 __x64_sys_ioctl+0xd4/0x110 fs/ioctl.c:747
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f5b22667169
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5b20cd1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5b2287ffa0 RCX: 00007f5b22667169
RDX: 0000400000000040 RSI: 00000000400454ca RDI: 0000000000000007
RBP: 00007f5b226e82a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5b2287ffa0 R15: 00007fff204398a8
Modules linked in:
CR2: 0000000000000000
---[ end trace b37b248cd6834f5e ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010002
RAX: ffffffff8154e8aa RBX: 0000000000000101 RCX: ffff8881e8815e80
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881df7071c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154e4ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa378
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881df7071c0
FS:  00007f5b20cd16c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e63ef000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e8 48 c1 e8 03       	call   0x3e8c14d
   5:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax
   a:	84 c0                	test   %al,%al
   c:	0f 85 e8 07 00 00    	jne    0x7fa
  12:	49 0f bf 06          	movswq (%r14),%rax
  16:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
  1b:	48 01 c6             	add    %rax,%rsi
  1e:	48 8d 53 40          	lea    0x40(%rbx),%rdx
  22:	48 89 df             	mov    %rbx,%rdi
  25:	e8 3f 0a 00 00       	call   0xa69
* 2a:	84 c0                	test   %al,%al <-- trapping instruction
  2c:	0f 84 63 01 00 00    	je     0x195
  32:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  39:	fc ff df
  3c:	48                   	rex.W
  3d:	8b                   	.byte 0x8b
  3e:	4c                   	rex.WR
  3f:	24                   	.byte 0x24