==================================================================
BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:814 [inline]
BUG: KASAN: use-after-free in enqueue_timer+0xb7/0x300 kernel/time/timer.c:541
Write of size 8 at addr ffff8881e53eb1c8 by task syz.5.290/1699

CPU: 0 PID: 1699 Comm: syz.5.290 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_add_head include/linux/list.h:814 [inline]
 enqueue_timer+0xb7/0x300 kernel/time/timer.c:541
 __internal_add_timer kernel/time/timer.c:554 [inline]
 internal_add_timer+0x240/0x430 kernel/time/timer.c:604
 __mod_timer+0x6f1/0x13e0 kernel/time/timer.c:1065
 call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
 expire_timers kernel/time/timer.c:1493 [inline]
 __run_timers+0x879/0xbe0 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:preempt_count_add+0x13e/0x180 kernel/sched/core.c:4016
Code: 07 80 c1 03 38 c1 0f 8c 09 ff ff ff 48 c7 c7 c0 49 eb 86 e8 a4 43 4f 00 e9 f8 fe ff ff 48 c7 c1 c0 49 eb 86 80 e1 07 80 c1 03 <38> c1 0f 8c 12 ff ff ff 48 c7 c7 c0 49 eb 86 e8 7e 43 4f 00 e9 01
RSP: 0018:ffff8881e662efe0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000004 RBX: 0000000000000001 RCX: ffffffff86eb4903
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000001
RBP: ffff8881e662f2f0 R08: ffffffff8153c592 R09: ffff8881e662f350
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1103ccc5e60
R13: ffffffff84600090 R14: ffff8881e662f300 R15: dffffc0000000000
 unwind_next_frame+0x17c/0x1ea0 arch/x86/kernel/unwind_orc.c:423
 arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123
 save_stack+0x95/0x880 mm/page_owner.c:122
 __reset_page_owner+0x1f/0x100 mm/page_owner.c:149
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 free_pcp_prepare mm/page_alloc.c:1233 [inline]
 free_unref_page_prepare+0x297/0x380 mm/page_alloc.c:3085
 free_unref_page_list+0x10a/0x590 mm/page_alloc.c:3154
 release_pages+0xad8/0xb20 mm/swap.c:842
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:189 [inline]
 tlb_flush_mmu mm/mmu_gather.c:196 [inline]
 tlb_finish_mmu+0x177/0x320 mm/mmu_gather.c:277
 exit_mmap+0x2dc/0x520 mm/mmap.c:3193
 __mmput+0x8e/0x2c0 kernel/fork.c:1101
 exit_mm kernel/exit.c:538 [inline]
 do_exit+0xc08/0x2bc0 kernel/exit.c:848
 do_group_exit+0x138/0x300 kernel/exit.c:984
 get_signal+0xdb1/0x1440 kernel/signal.c:2738
 do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159
 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7fb05db00169
Code: Bad RIP value.
RSP: 002b:00007fb05c1490e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fb05dd19088 RCX: 00007fb05db00169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb05dd19088
RBP: 00007fb05dd19080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb05dd1908c
R13: 0000000000000000 R14: 00007fff8463c8d0 R15: 00007fff8463c9b8

Allocated by task 1482:
 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]
 avc_alloc_node+0x8f/0x460 security/selinux/avc.c:504
 avc_insert security/selinux/avc.c:630 [inline]
 avc_compute_av+0x15c/0x6f0 security/selinux/avc.c:1012
 avc_has_perm_noaudit+0x2ad/0x3d0 security/selinux/avc.c:1155
 cred_has_capability security/selinux/hooks.c:1675 [inline]
 selinux_vm_enough_memory+0x100/0x170 security/selinux/hooks.c:2266
 security_vm_enough_memory_mm+0x67/0xa0 security/security.c:766
 shmem_acct_block mm/shmem.c:205 [inline]
 shmem_inode_acct_block mm/shmem.c:220 [inline]
 shmem_alloc_and_acct_page+0x1a3/0x9d0 mm/shmem.c:1522
 shmem_getpage_gfp+0xf5d/0x2440 mm/shmem.c:1852
 shmem_getpage mm/shmem.c:154 [inline]
 shmem_write_begin+0xc9/0x1a0 mm/shmem.c:2447
 generic_perform_write+0x2c7/0x560 mm/filemap.c:3450
 __generic_file_write_iter+0x224/0x530 mm/filemap.c:3579
 generic_file_write_iter+0x455/0x5f0 mm/filemap.c:3611
 call_write_iter include/linux/fs.h:1991 [inline]
 new_sync_write fs/read_write.c:483 [inline]
 __vfs_write+0x5d3/0x750 fs/read_write.c:496
 vfs_write+0x206/0x4e0 fs/read_write.c:558
 ksys_write+0x199/0x2c0 fs/read_write.c:611
 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
 avc_node_free+0x49/0x60 security/selinux/avc.c:438
 __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 ffff8881e53eb1a0
 which belongs to the cache avc_node of size 72
The buggy address is located 40 bytes inside of
 72-byte region [ffff8881e53eb1a0, ffff8881e53eb1e8)
The buggy address belongs to the page:
page:ffffea000794fac0 refcount:1 mapcount:0 mapping:ffff8881f5cf2f00 index:0x0
flags: 0x8000000000000200(slab)
raw: 8000000000000200 dead000000000100 dead000000000122 ffff8881f5cf2f00
raw: 0000000000000000 0000000000270027 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__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
 kmem_cache_zalloc include/linux/slab.h:680 [inline]
 avc_alloc_node+0x8f/0x460 security/selinux/avc.c:504
 avc_insert security/selinux/avc.c:630 [inline]
 avc_compute_av+0x15c/0x6f0 security/selinux/avc.c:1012
 avc_has_perm_noaudit+0x2ad/0x3d0 security/selinux/avc.c:1155
 avc_has_perm+0xd2/0x260 security/selinux/avc.c:1190
 security_task_alloc+0xe4/0x120 security/security.c:1549
 copy_process+0x11b9/0x3230 kernel/fork.c:2034
 _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
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_pcp_prepare mm/page_alloc.c:1233 [inline]
 free_unref_page_prepare+0x297/0x380 mm/page_alloc.c:3085
 free_unref_page mm/page_alloc.c:3134 [inline]
 free_the_page mm/page_alloc.c:4953 [inline]
 __free_pages+0xaf/0x140 mm/page_alloc.c:4961
 __vunmap+0x75b/0x890 mm/vmalloc.c:2260
 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:884 [inline]
 get_entries net/ipv6/netfilter/ip6_tables.c:1042 [inline]
 do_ip6t_get_ctl+0x88c/0xb60 net/ipv6/netfilter/ip6_tables.c:1712
 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
 nf_getsockopt+0x28c/0x2b0 net/netfilter/nf_sockopt.c:122
 ipv6_getsockopt+0x1fe/0x300 net/ipv6/ipv6_sockglue.c:1413
 __sys_getsockopt+0x1c0/0x2b0 net/socket.c:2138
 __do_sys_getsockopt net/socket.c:2153 [inline]
 __se_sys_getsockopt net/socket.c:2150 [inline]
 __x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2150
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Memory state around the buggy address:
 ffff8881e53eb080: fb fb fb fb fb fb fc fc fc fc fb fb fb fb fb fb
 ffff8881e53eb100: fb fb fb fc fc fc fc fb fb fb fb fb fb fb fb fb
>ffff8881e53eb180: fc fc fc fc fb fb fb fb fb fb fb fb fb fc fc fc
                                              ^
 ffff8881e53eb200: fc fb fb fb fb fb fb fb fb fb fc fc fc fc fb fb
 ffff8881e53eb280: fb fb fb fb fb fb fb fc fc fc fc fb fb fb fb fb
==================================================================
kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
BUG: unable to handle page fault for address: ffff8881e53eb448
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0011) - permissions violation
PGD 7801067 P4D 7801067 PUD 1e1e0b063 PMD 80000001e52001e3 
Oops: 0011 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1699 Comm: syz.5.290 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: 0010:0xffff8881e53eb448
Code: 1f 3e 00 00 00 00 ff ff ff ff 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 22 01 00 00 00 00 ad de <98> bb 3e e5 81 88 ff ff 00 00 00 00 00 00 00 00 ca 05 00 00 d0 01
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010202
RAX: ffffffff8154e8ca RBX: 0000000000000101 RCX: ffff8881cfd4ee40
RDX: 0000000000000101 RSI: ffff8881e53eb448 RDI: ffff8881e53eb1c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffb828
R13: dffffc0000000000 R14: ffff8881e53eb448 R15: ffff8881e53eb1c0
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8881e53eb448 CR3: 0000000005e0e000 CR4: 00000000003406b0
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:preempt_count_add+0x13e/0x180 kernel/sched/core.c:4016
Code: 07 80 c1 03 38 c1 0f 8c 09 ff ff ff 48 c7 c7 c0 49 eb 86 e8 a4 43 4f 00 e9 f8 fe ff ff 48 c7 c1 c0 49 eb 86 80 e1 07 80 c1 03 <38> c1 0f 8c 12 ff ff ff 48 c7 c7 c0 49 eb 86 e8 7e 43 4f 00 e9 01
RSP: 0018:ffff8881e662efe0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000004 RBX: 0000000000000001 RCX: ffffffff86eb4903
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000001
RBP: ffff8881e662f2f0 R08: ffffffff8153c592 R09: ffff8881e662f350
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1103ccc5e60
R13: ffffffff84600090 R14: ffff8881e662f300 R15: dffffc0000000000
 unwind_next_frame+0x17c/0x1ea0 arch/x86/kernel/unwind_orc.c:423
 arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123
 save_stack+0x95/0x880 mm/page_owner.c:122
 __reset_page_owner+0x1f/0x100 mm/page_owner.c:149
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 free_pcp_prepare mm/page_alloc.c:1233 [inline]
 free_unref_page_prepare+0x297/0x380 mm/page_alloc.c:3085
 free_unref_page_list+0x10a/0x590 mm/page_alloc.c:3154
 release_pages+0xad8/0xb20 mm/swap.c:842
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:189 [inline]
 tlb_flush_mmu mm/mmu_gather.c:196 [inline]
 tlb_finish_mmu+0x177/0x320 mm/mmu_gather.c:277
 exit_mmap+0x2dc/0x520 mm/mmap.c:3193
 __mmput+0x8e/0x2c0 kernel/fork.c:1101
 exit_mm kernel/exit.c:538 [inline]
 do_exit+0xc08/0x2bc0 kernel/exit.c:848
 do_group_exit+0x138/0x300 kernel/exit.c:984
 get_signal+0xdb1/0x1440 kernel/signal.c:2738
 do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159
 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7fb05db00169
Code: Bad RIP value.
RSP: 002b:00007fb05c1490e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fb05dd19088 RCX: 00007fb05db00169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb05dd19088
RBP: 00007fb05dd19080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb05dd1908c
R13: 0000000000000000 R14: 00007fff8463c8d0 R15: 00007fff8463c9b8
Modules linked in:
CR2: ffff8881e53eb448
---[ end trace 9ba53bc555a85b03 ]---
RIP: 0010:0xffff8881e53eb448
Code: 1f 3e 00 00 00 00 ff ff ff ff 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 22 01 00 00 00 00 ad de <98> bb 3e e5 81 88 ff ff 00 00 00 00 00 00 00 00 ca 05 00 00 d0 01
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010202
RAX: ffffffff8154e8ca RBX: 0000000000000101 RCX: ffff8881cfd4ee40
RDX: 0000000000000101 RSI: ffff8881e53eb448 RDI: ffff8881e53eb1c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffb828
R13: dffffc0000000000 R14: ffff8881e53eb448 R15: ffff8881e53eb1c0
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb05db0013f CR3: 0000000005e0e000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	80 c1 03             	add    $0x3,%cl
   3:	38 c1                	cmp    %al,%cl
   5:	0f 8c 09 ff ff ff    	jl     0xffffff14
   b:	48 c7 c7 c0 49 eb 86 	mov    $0xffffffff86eb49c0,%rdi
  12:	e8 a4 43 4f 00       	call   0x4f43bb
  17:	e9 f8 fe ff ff       	jmp    0xffffff14
  1c:	48 c7 c1 c0 49 eb 86 	mov    $0xffffffff86eb49c0,%rcx
  23:	80 e1 07             	and    $0x7,%cl
  26:	80 c1 03             	add    $0x3,%cl
* 29:	38 c1                	cmp    %al,%cl <-- trapping instruction
  2b:	0f 8c 12 ff ff ff    	jl     0xffffff43
  31:	48 c7 c7 c0 49 eb 86 	mov    $0xffffffff86eb49c0,%rdi
  38:	e8 7e 43 4f 00       	call   0x4f43bb
  3d:	e9                   	.byte 0xe9
  3e:	01                   	.byte 0x1