==================================================================
BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:773 [inline]
BUG: KASAN: use-after-free in detach_timer kernel/time/timer.c:824 [inline]
BUG: KASAN: use-after-free in expire_timers+0x155/0x400 kernel/time/timer.c:1452
Write of size 8 at addr ffff8881c3b371c8 by task swapper/0/0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.219-syzkaller-00096-gd7e5d5321233 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1d8/0x241 lib/dump_stack.c:118
print_address_description+0x8c/0x630 mm/kasan/report.c:384
__kasan_report+0xf6/0x130 mm/kasan/report.c:516
kasan_report+0x30/0x60 mm/kasan/common.c:653
__hlist_del include/linux/list.h:773 [inline]
detach_timer kernel/time/timer.c:824 [inline]
expire_timers+0x155/0x400 kernel/time/timer.c:1452
__run_timers+0x5e0/0x700 kernel/time/timer.c:1787
run_timer_softirq+0x46/0x80 kernel/time/timer.c:1800
__do_softirq+0x23e/0x643 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:538 [inline]
smp_apic_timer_interrupt+0x113/0x440 arch/x86/kernel/apic/apic.c:1150
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
The buggy address belongs to the page:
page:ffffea00070ecdc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 0000000000000000 ffffea00070ecd88 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+0x194/0x380 mm/page_alloc.c:2171
get_page_from_freelist+0x524/0x560 mm/page_alloc.c:3794
__alloc_pages_nodemask+0x372/0x860 mm/page_alloc.c:4891
__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/0xf0 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:759 [inline]
kvzalloc include/linux/mm.h:767 [inline]
alloc_netdev_mqs+0x86/0xc30 net/core/dev.c:9598
tun_set_iff+0x4f9/0x1050 drivers/net/tun.c:2825
__tun_chr_ioctl+0x88e/0x1ee0 drivers/net/tun.c:3160
do_vfs_ioctl+0x744/0x1730 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+0xcb/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+0x7fe/0x930 mm/page_alloc.c:1438
free_the_page mm/page_alloc.c:4953 [inline]
__free_pages+0x8f/0x250 mm/page_alloc.c:4959
kfree+0x1ef/0x260 mm/slub.c:4068
device_release+0x70/0x1a0 drivers/base/core.c:1776
kobject_cleanup lib/kobject.c:708 [inline]
kobject_release+0x20c/0x330 lib/kobject.c:739
netdev_run_todo+0xc1b/0xdb0 net/core/dev.c:9457
tun_detach drivers/net/tun.c:760 [inline]
tun_chr_close+0xc0/0xd0 drivers/net/tun.c:3534
__fput+0x261/0x680 fs/file_table.c:281
task_work_run+0x186/0x1b0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0xce6/0x2d30 kernel/exit.c:812
do_group_exit+0x136/0x300 kernel/exit.c:910
get_signal+0xd99/0x13f0 kernel/signal.c:2735
do_signal+0xb0/0x1200 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0xdd/0x1d0 arch/x86/entry/common.c:159
prepare_exit_to_usermode+0x17c/0x1d0 arch/x86/entry/common.c:194
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Memory state around the buggy address:
ffff8881c3b37080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8881c3b37100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881c3b37180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff8881c3b37200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8881c3b37280: 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: 0 PID: 0 Comm: swapper/0 Tainted: G B 5.4.219-syzkaller-00096-gd7e5d5321233 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:__hlist_del include/linux/list.h:773 [inline]
RIP: 0010:detach_timer kernel/time/timer.c:824 [inline]
RIP: 0010:expire_timers+0x146/0x400 kernel/time/timer.c:1452
Code: c1 e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 22 fe 3d 00 4d 89 3e 4d 85 ff 74 2a e8 55 97 0f 00 49 83 c7 08 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 fb fd 3d 00 4d 89 37 eb 0b 66 0f
RSP: 0018:ffff8881f6e09d08 EFLAGS: 00010802
RAX: 1bd5a00000000025 RBX: ffff8881c3b371c0 RCX: ffffffff85c18a00
RDX: 0000000000000102 RSI: 0000000000000008 RDI: ffff8881c3b371c8
RBP: 1ffff11038766e39 R08: dffffc0000000000 R09: 0000000000000003
R10: ffffed103edc1391 R11: 1ffff1103edc1390 R12: ffff8881c3b371c8
R13: dffffc0000000000 R14: ffff8881f6e09e20 R15: dead00000000012a
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc44c4af98 CR3: 00000001c5352000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__run_timers+0x5e0/0x700 kernel/time/timer.c:1787
run_timer_softirq+0x46/0x80 kernel/time/timer.c:1800
__do_softirq+0x23e/0x643 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:538 [inline]
smp_apic_timer_interrupt+0x113/0x440 arch/x86/kernel/apic/apic.c:1150
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
Modules linked in:
---[ end trace dec6f931ef6796ed ]---
RIP: 0010:__hlist_del include/linux/list.h:773 [inline]
RIP: 0010:detach_timer kernel/time/timer.c:824 [inline]
RIP: 0010:expire_timers+0x146/0x400 kernel/time/timer.c:1452
Code: c1 e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 22 fe 3d 00 4d 89 3e 4d 85 ff 74 2a e8 55 97 0f 00 49 83 c7 08 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 fb fd 3d 00 4d 89 37 eb 0b 66 0f
RSP: 0018:ffff8881f6e09d08 EFLAGS: 00010802
RAX: 1bd5a00000000025 RBX: ffff8881c3b371c0 RCX: ffffffff85c18a00
RDX: 0000000000000102 RSI: 0000000000000008 RDI: ffff8881c3b371c8
RBP: 1ffff11038766e39 R08: dffffc0000000000 R09: 0000000000000003
R10: ffffed103edc1391 R11: 1ffff1103edc1390 R12: ffff8881c3b371c8
R13: dffffc0000000000 R14: ffff8881f6e09e20 R15: dead00000000012a
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc44c4af98 CR3: 00000001c5352000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: c1 e8 03 shr $0x3,%eax
3: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
8: 74 08 je 0x12
a: 4c 89 f7 mov %r14,%rdi
d: e8 22 fe 3d 00 callq 0x3dfe34
12: 4d 89 3e mov %r15,(%r14)
15: 4d 85 ff test %r15,%r15
18: 74 2a je 0x44
1a: e8 55 97 0f 00 callq 0xf9774
1f: 49 83 c7 08 add $0x8,%r15
23: 4c 89 f8 mov %r15,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ff mov %r15,%rdi
34: e8 fb fd 3d 00 callq 0x3dfe34
39: 4d 89 37 mov %r14,(%r15)
3c: eb 0b jmp 0x49
3e: 66 data16
3f: 0f .byte 0xf