==================================================================
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 ffff8881eee2b1c8 by task syz.7.107/822

CPU: 1 PID: 822 Comm: syz.7.107 Not tainted 5.4.290-syzkaller-00017-g6b07fcd94a6a #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:freelist_ptr mm/slub.c:265 [inline]
RIP: 0010:freelist_dereference mm/slub.c:276 [inline]
RIP: 0010:get_freepointer mm/slub.c:282 [inline]
RIP: 0010:get_freepointer_safe mm/slub.c:296 [inline]
RIP: 0010:slab_alloc_node mm/slub.c:2795 [inline]
RIP: 0010:slab_alloc mm/slub.c:2837 [inline]
RIP: 0010:kmem_cache_alloc_trace+0x94/0x260 mm/slub.c:2854
Code: 20 4d 85 e4 0f 84 aa 00 00 00 48 83 78 10 00 0f 84 9f 00 00 00 8b 45 20 49 8d 0c 04 48 8b 9d b0 01 00 00 48 0f c9 49 33 1c 04 <48> 31 cb 48 89 d1 48 83 c1 08 48 8b 7d 00 4c 89 e0 65 48 0f c7 0f
RSP: 0018:ffff8881cba77950 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 8041e5d48188ffff RCX: 8041e5d48188ffff
RDX: 0000000000011889 RSI: 0000000000007298 RDI: 0000000000007299
RBP: ffff8881f5c03180 R08: ffffffff8247139d R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff8881d4e54180
R13: ffff8881f5c03180 R14: 0000000000000038 R15: 0000000000400cc0
 kmalloc include/linux/slab.h:556 [inline]
 alloc_fdtable+0x8f/0x240 fs/file.c:107
 dup_fd+0x76e/0xad0 fs/file.c:306
 copy_files+0xe1/0x1f0 kernel/fork.c:1485
 copy_process+0x11e3/0x3230 kernel/fork.c:2040
 _do_fork+0x197/0x900 kernel/fork.c:2399
 __do_sys_clone kernel/fork.c:2557 [inline]
 __se_sys_clone kernel/fork.c:2538 [inline]
 __x64_sys_clone+0x26b/0x2c0 kernel/fork.c:2538
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7faaa7c49169
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:00007faaa62b2fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007faaa7e61fa0 RCX: 00007faaa7c49169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000041980000
RBP: 00007faaa7cca2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007faaa7e61fa0 R15: 00007ffe46bef6d8

The buggy address belongs to the page:
page:ffffea0007bb8ac0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 0000000000000000 ffffea0007bb8ac8 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x146dc0(GFP_USER|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_COMP|__GFP_ZERO)
 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_pages include/linux/gfp.h:503 [inline]
 __alloc_pages_node include/linux/gfp.h:516 [inline]
 alloc_pages_node include/linux/gfp.h:530 [inline]
 kmalloc_order mm/slab_common.c:1342 [inline]
 kmalloc_order_trace+0x2a/0x100 mm/slab_common.c:1358
 __kmalloc_node include/linux/slab.h:422 [inline]
 kmalloc_node include/linux/slab.h:599 [inline]
 kvmalloc_node+0x7e/0xf0 mm/util.c:596
 kvmalloc include/linux/mm.h:761 [inline]
 kvzalloc include/linux/mm.h:769 [inline]
 alloc_netdev_mqs+0x85/0xc70 net/core/dev.c:9629
 tun_set_iff+0x51f/0xdc0 drivers/net/tun.c:2893
 __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
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+0x91/0x140 mm/page_alloc.c:4961
 device_release+0x6b/0x190 drivers/base/core.c:1776
 kobject_cleanup lib/kobject.c:716 [inline]
 kobject_release lib/kobject.c:747 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1e6/0x2f0 lib/kobject.c:764
 netdev_run_todo+0xc44/0xdf0 net/core/dev.c:9488
 tun_detach drivers/net/tun.c:766 [inline]
 tun_chr_close+0xc1/0x130 drivers/net/tun.c:3563
 __fput+0x262/0x680 fs/file_table.c:281
 task_work_run+0x140/0x170 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x190/0x1a0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Memory state around the buggy address:
 ffff8881eee2b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881eee2b100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881eee2b180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff8881eee2b200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881eee2b280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 822 Comm: syz.7.107 Tainted: G    B             5.4.290-syzkaller-00017-g6b07fcd94a6a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:__hlist_del include/linux/list.h:791 [inline]
RIP: 0010:detach_timer kernel/time/timer.c:824 [inline]
RIP: 0010:expire_timers kernel/time/timer.c:1482 [inline]
RIP: 0010:__run_timers+0x7b0/0xbe0 kernel/time/timer.c:1817
Code: 89 e7 e8 63 51 3f 00 4d 89 2c 24 4d 85 ed 74 2e e8 a5 66 0f 00 49 83 c5 08 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 32 51 3f 00 4d 89 65 00 eb 05 e8 77
RSP: 0018:ffff8881f6f09d60 EFLAGS: 00010802
RAX: 1bd5a00000000025 RBX: 1ffff1103ddc5639 RCX: dffffc0000000000
RDX: 0000000000000101 RSI: 0000000000000008 RDI: ffff8881eee2b1c8
RBP: ffff8881f6f09ec8 R08: dffffc0000000000 R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff8881f6f09e28
R13: dead00000000012a R14: 1ffff1103ddc5638 R15: ffff8881eee2b1c8
FS:  00007faaa62b36c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faaa7e56240 CR3: 00000001e05b5000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 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:freelist_ptr mm/slub.c:265 [inline]
RIP: 0010:freelist_dereference mm/slub.c:276 [inline]
RIP: 0010:get_freepointer mm/slub.c:282 [inline]
RIP: 0010:get_freepointer_safe mm/slub.c:296 [inline]
RIP: 0010:slab_alloc_node mm/slub.c:2795 [inline]
RIP: 0010:slab_alloc mm/slub.c:2837 [inline]
RIP: 0010:kmem_cache_alloc_trace+0x94/0x260 mm/slub.c:2854
Code: 20 4d 85 e4 0f 84 aa 00 00 00 48 83 78 10 00 0f 84 9f 00 00 00 8b 45 20 49 8d 0c 04 48 8b 9d b0 01 00 00 48 0f c9 49 33 1c 04 <48> 31 cb 48 89 d1 48 83 c1 08 48 8b 7d 00 4c 89 e0 65 48 0f c7 0f
RSP: 0018:ffff8881cba77950 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 8041e5d48188ffff RCX: 8041e5d48188ffff
RDX: 0000000000011889 RSI: 0000000000007298 RDI: 0000000000007299
RBP: ffff8881f5c03180 R08: ffffffff8247139d R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff8881d4e54180
R13: ffff8881f5c03180 R14: 0000000000000038 R15: 0000000000400cc0
 kmalloc include/linux/slab.h:556 [inline]
 alloc_fdtable+0x8f/0x240 fs/file.c:107
 dup_fd+0x76e/0xad0 fs/file.c:306
 copy_files+0xe1/0x1f0 kernel/fork.c:1485
 copy_process+0x11e3/0x3230 kernel/fork.c:2040
 _do_fork+0x197/0x900 kernel/fork.c:2399
 __do_sys_clone kernel/fork.c:2557 [inline]
 __se_sys_clone kernel/fork.c:2538 [inline]
 __x64_sys_clone+0x26b/0x2c0 kernel/fork.c:2538
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7faaa7c49169
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:00007faaa62b2fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007faaa7e61fa0 RCX: 00007faaa7c49169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000041980000
RBP: 00007faaa7cca2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007faaa7e61fa0 R15: 00007ffe46bef6d8
Modules linked in:
---[ end trace 51c2c55b08ded6d7 ]---
RIP: 0010:__hlist_del include/linux/list.h:791 [inline]
RIP: 0010:detach_timer kernel/time/timer.c:824 [inline]
RIP: 0010:expire_timers kernel/time/timer.c:1482 [inline]
RIP: 0010:__run_timers+0x7b0/0xbe0 kernel/time/timer.c:1817
Code: 89 e7 e8 63 51 3f 00 4d 89 2c 24 4d 85 ed 74 2e e8 a5 66 0f 00 49 83 c5 08 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 32 51 3f 00 4d 89 65 00 eb 05 e8 77
RSP: 0018:ffff8881f6f09d60 EFLAGS: 00010802
RAX: 1bd5a00000000025 RBX: 1ffff1103ddc5639 RCX: dffffc0000000000
RDX: 0000000000000101 RSI: 0000000000000008 RDI: ffff8881eee2b1c8
RBP: ffff8881f6f09ec8 R08: dffffc0000000000 R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff8881f6f09e28
R13: dead00000000012a R14: 1ffff1103ddc5638 R15: ffff8881eee2b1c8
FS:  00007faaa62b36c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faaa7e56240 CR3: 00000001e05b5000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	20 4d 85             	and    %cl,-0x7b(%rbp)
   3:	e4 0f                	in     $0xf,%al
   5:	84 aa 00 00 00 48    	test   %ch,0x48000000(%rdx)
   b:	83 78 10 00          	cmpl   $0x0,0x10(%rax)
   f:	0f 84 9f 00 00 00    	je     0xb4
  15:	8b 45 20             	mov    0x20(%rbp),%eax
  18:	49 8d 0c 04          	lea    (%r12,%rax,1),%rcx
  1c:	48 8b 9d b0 01 00 00 	mov    0x1b0(%rbp),%rbx
  23:	48 0f c9             	bswap  %rcx
  26:	49 33 1c 04          	xor    (%r12,%rax,1),%rbx
* 2a:	48 31 cb             	xor    %rcx,%rbx <-- trapping instruction
  2d:	48 89 d1             	mov    %rdx,%rcx
  30:	48 83 c1 08          	add    $0x8,%rcx
  34:	48 8b 7d 00          	mov    0x0(%rbp),%rdi
  38:	4c 89 e0             	mov    %r12,%rax
  3b:	65 48 0f c7 0f       	cmpxchg16b %gs:(%rdi)