==================================================================
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+0x759/0xb60 kernel/time/timer.c:1817
Write of size 8 at addr ffff8881c68731c8 by task syz-executor/1173

CPU: 0 PID: 1173 Comm: syz-executor Tainted: G        W         5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <IRQ>
 __dump_stack+0x1e/0x20 lib/dump_stack.c:77
 dump_stack+0x15b/0x1b8 lib/dump_stack.c:118
 print_address_description+0x8d/0x4c0 mm/kasan/report.c:384
 __kasan_report+0xef/0x120 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 __asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:137
 __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+0x759/0xb60 kernel/time/timer.c:1817
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x236/0x660 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x197/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:539 [inline]
 smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:180
Code: c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 be 0c 00 00 00 48 c7 c7 00 96 d1 85 e8 6b f2 2d 00 5d c3 00 00 90 90 00 00 90 90 00 <55> 48 89 e5 48 8b 45 08 65 48 8b 0d 90 0e a3 7e 65 8b 15 95 0e a3
RSP: 0018:ffff8881d52ef9d8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: ffffffff82209b2d RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8881f31d9f80 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff8881d52efa98 R08: dffffc0000000000 R09: fffff94000eddfe7
R10: fffff94000eddfe7 R11: 1ffffd4000eddfe6 R12: ffffffff84da3280
R13: 1ffff1103aa5df40 R14: 0000000000000001 R15: ffffffff84c23f40
 __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:64
 __mod_node_page_state+0x92/0xc0 mm/vmstat.c:352
 __mod_lruvec_page_state include/linux/memcontrol.h:765 [inline]
 page_add_file_rmap+0x435/0x4f0 mm/rmap.c:1220
 insert_page mm/memory.c:1501 [inline]
 vm_insert_page+0x556/0x710 mm/memory.c:1552
 kcov_mmap+0xf3/0x120 kernel/kcov.c:467
 call_mmap include/linux/fs.h:1996 [inline]
 mmap_region+0x101b/0x15a0 mm/mmap.c:1812
 do_mmap+0x826/0xd90 mm/mmap.c:1581
 do_mmap_pgoff include/linux/mm.h:2480 [inline]
 vm_mmap_pgoff+0x195/0x230 mm/util.c:528
 ksys_mmap_pgoff+0x16f/0x1e0 mm/mmap.c:1631
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:97 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:88 [inline]
 __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:88
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f3cd8d3a9a3
Code: f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 89 ca 41 f7 c1 ff 0f 00 00 75 14 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 25 c3 0f 1f 40 00 48 c7 c0 a8 ff ff ff 64 c7
RSP: 002b:00007ffdcfe8a488 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f3cd8f62118 RCX: 00007f3cd8d3a9a3
RDX: 0000000000000003 RSI: 0000000000400000 RDI: 00007f3cd7fa9000
RBP: 00007f3cd8f62118 R08: 00000000000000d9 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000008
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea00071a1cc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 ffffea0007cbbd08 ffffea000723a608 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+0x35e/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x1296/0x1310 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x202/0x4b0 mm/page_alloc.c:4894
 __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]
 __vmalloc_area_node mm/vmalloc.c:-1 [inline]
 __vmalloc_node_range+0x36a/0x6e0 mm/vmalloc.c:2499
 vmalloc_user+0x73/0x80 mm/vmalloc.c:2629
 kcov_mmap+0x2b/0x120 kernel/kcov.c:450
 call_mmap include/linux/fs.h:1996 [inline]
 mmap_region+0x101b/0x15a0 mm/mmap.c:1812
 do_mmap+0x826/0xd90 mm/mmap.c:1581
 do_mmap_pgoff include/linux/mm.h:2480 [inline]
 vm_mmap_pgoff+0x195/0x230 mm/util.c:528
 ksys_mmap_pgoff+0x16f/0x1e0 mm/mmap.c:1631
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:97 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:88 [inline]
 __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:88
 do_syscall_64+0xcf/0x170 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+0x2a9/0x3a0 mm/page_alloc.c:3085
 free_unref_page mm/page_alloc.c:3134 [inline]
 free_the_page mm/page_alloc.c:4954 [inline]
 __free_pages+0xaa/0x110 mm/page_alloc.c:4962
 __vunmap+0x76a/0x8a0 mm/vmalloc.c:2260
 __vfree mm/vmalloc.c:2308 [inline]
 vfree+0x61/0x90 mm/vmalloc.c:2338
 kcov_put kernel/kcov.c:396 [inline]
 kcov_close+0x2b/0x50 kernel/kcov.c:495
 __fput+0x2a3/0x730 fs/file_table.c:281
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x146/0x170 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xa43/0x2660 kernel/exit.c:861
 do_group_exit+0x13e/0x300 kernel/exit.c:984
 __do_sys_exit_group kernel/exit.c:995 [inline]
 __se_sys_exit_group kernel/exit.c:993 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:993
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Memory state around the buggy address:
 ffff8881c6873080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881c6873100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881c6873180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff8881c6873200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881c6873280: 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: 0 PID: 1173 Comm: syz-executor Tainted: G    B   W         5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881f31d9f80
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881c68731c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffff9e00
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881c68731c0
FS:  00005555733ab500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001dd81e000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 call_timer_fn+0x3c/0x380 kernel/time/timer.c:1448
 expire_timers kernel/time/timer.c:1493 [inline]
 __run_timers+0x81d/0xb60 kernel/time/timer.c:1817
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x236/0x660 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x197/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:539 [inline]
 smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:180
Code: c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 be 0c 00 00 00 48 c7 c7 00 96 d1 85 e8 6b f2 2d 00 5d c3 00 00 90 90 00 00 90 90 00 <55> 48 89 e5 48 8b 45 08 65 48 8b 0d 90 0e a3 7e 65 8b 15 95 0e a3
RSP: 0018:ffff8881d52ef9d8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: ffffffff82209b2d RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8881f31d9f80 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff8881d52efa98 R08: dffffc0000000000 R09: fffff94000eddfe7
R10: fffff94000eddfe7 R11: 1ffffd4000eddfe6 R12: ffffffff84da3280
R13: 1ffff1103aa5df40 R14: 0000000000000001 R15: ffffffff84c23f40
 __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:64
 __mod_node_page_state+0x92/0xc0 mm/vmstat.c:352
 __mod_lruvec_page_state include/linux/memcontrol.h:765 [inline]
 page_add_file_rmap+0x435/0x4f0 mm/rmap.c:1220
 insert_page mm/memory.c:1501 [inline]
 vm_insert_page+0x556/0x710 mm/memory.c:1552
 kcov_mmap+0xf3/0x120 kernel/kcov.c:467
 call_mmap include/linux/fs.h:1996 [inline]
 mmap_region+0x101b/0x15a0 mm/mmap.c:1812
 do_mmap+0x826/0xd90 mm/mmap.c:1581
 do_mmap_pgoff include/linux/mm.h:2480 [inline]
 vm_mmap_pgoff+0x195/0x230 mm/util.c:528
 ksys_mmap_pgoff+0x16f/0x1e0 mm/mmap.c:1631
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:97 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:88 [inline]
 __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:88
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f3cd8d3a9a3
Code: f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 89 ca 41 f7 c1 ff 0f 00 00 75 14 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 25 c3 0f 1f 40 00 48 c7 c0 a8 ff ff ff 64 c7
RSP: 002b:00007ffdcfe8a488 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f3cd8f62118 RCX: 00007f3cd8d3a9a3
RDX: 0000000000000003 RSI: 0000000000400000 RDI: 00007f3cd7fa9000
RBP: 00007f3cd8f62118 R08: 00000000000000d9 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000008
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
Modules linked in:
CR2: 0000000000000000
---[ end trace 5b03d986a3c96a3e ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881f31d9f80
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881c68731c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffff9e00
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881c68731c0
FS:  00005555733ab500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001dd81e000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600