==================================================================
BUG: KASAN: use-after-free in hlist_move_list include/linux/list.h:870 [inline]
BUG: KASAN: use-after-free in __collect_expired_timers kernel/time/timer.c:1514 [inline]
BUG: KASAN: use-after-free in collect_expired_timers kernel/time/timer.c:1749 [inline]
BUG: KASAN: use-after-free in __run_timers+0x521/0xbe0 kernel/time/timer.c:1813
Write of size 8 at addr ffff8881df7231c8 by task syz.3.324/1594

CPU: 1 PID: 1594 Comm: syz.3.324 Not tainted 5.4.290-syzkaller-00017-g6b07fcd94a6a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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_move_list include/linux/list.h:870 [inline]
 __collect_expired_timers kernel/time/timer.c:1514 [inline]
 collect_expired_timers kernel/time/timer.c:1749 [inline]
 __run_timers+0x521/0xbe0 kernel/time/timer.c:1813
 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:__slab_free+0x9b/0x360 mm/slub.c:2916
Code: 54 24 18 4c 89 c1 44 8b 44 24 0c e8 df 02 00 00 4c 8b 44 24 20 48 8b 3c 24 85 c0 0f 84 05 02 00 00 31 f6 31 c0 48 89 44 24 10 <eb> 1c 48 8b 5c 24 18 4c 89 e1 4c 89 e8 4c 89 fa f0 49 0f c7 4e 20
RSP: 0018:ffff8881e2007a10 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffff8881eb605498 RCX: ffffffffab7eb930
RDX: ffff8881eb605930 RSI: 0000000000000000 RDI: ffff8881f5cf1b80
RBP: ffffea0007ad8140 R08: ffff8881eb605930 R09: ffffffff818e4f12
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f5cf1b80
R13: ffff8881eb605498 R14: ffffea0007ad8140 R15: ffff8881eb605930
 do_slab_free mm/slub.c:3068 [inline]
 slab_free mm/slub.c:3081 [inline]
 kmem_cache_free+0x252/0x2c0 mm/slub.c:3096
 anon_vma_free mm/rmap.c:126 [inline]
 __put_anon_vma+0xc2/0x1d0 mm/rmap.c:1817
 put_anon_vma include/linux/rmap.h:129 [inline]
 unlink_anon_vmas+0x450/0x590 mm/rmap.c:421
 free_pgtables+0x12d/0x280 mm/memory.c:427
 exit_mmap+0x2cb/0x520 mm/mmap.c:3192
 __mmput+0x8e/0x2c0 kernel/fork.c:1101
 exit_mm kernel/exit.c:538 [inline]
 do_exit+0xc08/0x2bc0 kernel/exit.c:848
 __do_sys_exit kernel/exit.c:953 [inline]
 __se_sys_exit kernel/exit.c:951 [inline]
 __x64_sys_exit+0x3c/0x40 kernel/exit.c:951
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f3d14ef5169
Code: Bad RIP value.
RSP: 002b:00007f3d1355efe8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007f3d1510dfa0 RCX: 00007f3d14ef5169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f3d14f762a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3d1510dfa0 R15: 00007ffc9e3f8058

The buggy address belongs to the page:
page:ffffea00077dc8c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 ffffea000767ac08 ffffea0007352408 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 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__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
 __vmalloc_area_node mm/vmalloc.c:2431 [inline]
 __vmalloc_node_range+0x384/0x710 mm/vmalloc.c:2499
 vmalloc_user+0x70/0x80 mm/vmalloc.c:2629
 kcov_mmap+0x28/0x120 kernel/kcov.c:450
 call_mmap include/linux/fs.h:1996 [inline]
 mmap_region+0x110d/0x16f0 mm/mmap.c:1812
 do_mmap+0x822/0xd30 mm/mmap.c:1581
 do_mmap_pgoff include/linux/mm.h:2480 [inline]
 vm_mmap_pgoff+0x1b5/0x260 mm/util.c:528
 ksys_mmap_pgoff+0x168/0x1e0 mm/mmap.c:1631
 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_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
 kcov_mmap+0x8c/0x120 kernel/kcov.c:474
 call_mmap include/linux/fs.h:1996 [inline]
 mmap_region+0x110d/0x16f0 mm/mmap.c:1812
 do_mmap+0x822/0xd30 mm/mmap.c:1581
 do_mmap_pgoff include/linux/mm.h:2480 [inline]
 vm_mmap_pgoff+0x1b5/0x260 mm/util.c:528
 ksys_mmap_pgoff+0x168/0x1e0 mm/mmap.c:1631
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Memory state around the buggy address:
 ffff8881df723080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881df723100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881df723180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff8881df723200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881df723280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 0 P4D 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1594 Comm: syz.3.324 Tainted: G    B             5.4.290-syzkaller-00017-g6b07fcd94a6a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010206
RAX: ffffffff8154e8ca RBX: 0000000000000100 RCX: ffff8881dff46e40
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881df7231c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff9ff0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881df7231c0
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001dce56000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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:__slab_free+0x9b/0x360 mm/slub.c:2916
Code: 54 24 18 4c 89 c1 44 8b 44 24 0c e8 df 02 00 00 4c 8b 44 24 20 48 8b 3c 24 85 c0 0f 84 05 02 00 00 31 f6 31 c0 48 89 44 24 10 <eb> 1c 48 8b 5c 24 18 4c 89 e1 4c 89 e8 4c 89 fa f0 49 0f c7 4e 20
RSP: 0018:ffff8881e2007a10 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffff8881eb605498 RCX: ffffffffab7eb930
RDX: ffff8881eb605930 RSI: 0000000000000000 RDI: ffff8881f5cf1b80
RBP: ffffea0007ad8140 R08: ffff8881eb605930 R09: ffffffff818e4f12
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f5cf1b80
R13: ffff8881eb605498 R14: ffffea0007ad8140 R15: ffff8881eb605930
 do_slab_free mm/slub.c:3068 [inline]
 slab_free mm/slub.c:3081 [inline]
 kmem_cache_free+0x252/0x2c0 mm/slub.c:3096
 anon_vma_free mm/rmap.c:126 [inline]
 __put_anon_vma+0xc2/0x1d0 mm/rmap.c:1817
 put_anon_vma include/linux/rmap.h:129 [inline]
 unlink_anon_vmas+0x450/0x590 mm/rmap.c:421
 free_pgtables+0x12d/0x280 mm/memory.c:427
 exit_mmap+0x2cb/0x520 mm/mmap.c:3192
 __mmput+0x8e/0x2c0 kernel/fork.c:1101
 exit_mm kernel/exit.c:538 [inline]
 do_exit+0xc08/0x2bc0 kernel/exit.c:848
 __do_sys_exit kernel/exit.c:953 [inline]
 __se_sys_exit kernel/exit.c:951 [inline]
 __x64_sys_exit+0x3c/0x40 kernel/exit.c:951
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f3d14ef5169
Code: Bad RIP value.
RSP: 002b:00007f3d1355efe8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007f3d1510dfa0 RCX: 00007f3d14ef5169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f3d14f762a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3d1510dfa0 R15: 00007ffc9e3f8058
Modules linked in:
CR2: 0000000000000000
---[ end trace e5fadf5aa7039cee ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010206
RAX: ffffffff8154e8ca RBX: 0000000000000100 RCX: ffff8881dff46e40
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881df7231c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff9ff0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881df7231c0
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001dce56000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
   0:	54                   	push   %rsp
   1:	24 18                	and    $0x18,%al
   3:	4c 89 c1             	mov    %r8,%rcx
   6:	44 8b 44 24 0c       	mov    0xc(%rsp),%r8d
   b:	e8 df 02 00 00       	call   0x2ef
  10:	4c 8b 44 24 20       	mov    0x20(%rsp),%r8
  15:	48 8b 3c 24          	mov    (%rsp),%rdi
  19:	85 c0                	test   %eax,%eax
  1b:	0f 84 05 02 00 00    	je     0x226
  21:	31 f6                	xor    %esi,%esi
  23:	31 c0                	xor    %eax,%eax
  25:	48 89 44 24 10       	mov    %rax,0x10(%rsp)
* 2a:	eb 1c                	jmp    0x48 <-- trapping instruction
  2c:	48 8b 5c 24 18       	mov    0x18(%rsp),%rbx
  31:	4c 89 e1             	mov    %r12,%rcx
  34:	4c 89 e8             	mov    %r13,%rax
  37:	4c 89 fa             	mov    %r15,%rdx
  3a:	f0 49 0f c7 4e 20    	lock cmpxchg16b 0x20(%r14)