==================================================================
BUG: KASAN: slab-out-of-bounds in __hlist_del include/linux/list.h:791 [inline]
BUG: KASAN: slab-out-of-bounds in detach_timer kernel/time/timer.c:824 [inline]
BUG: KASAN: slab-out-of-bounds in expire_timers kernel/time/timer.c:1482 [inline]
BUG: KASAN: slab-out-of-bounds in __run_timers+0x7be/0xbe0 kernel/time/timer.c:1817
Write of size 8 at addr ffff8881e8d771c8 by task syz.4.298/1509
CPU: 1 PID: 1509 Comm: syz.4.298 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:
__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
RIP: 0010:__sanitizer_cov_trace_cmp4+0x0/0x70 kernel/kcov.c:248
Code: 28 4c 39 d0 77 cf 89 f8 89 f6 48 c7 44 0a 08 02 00 00 00 48 89 44 0a 10 48 89 74 0a 18 4c 89 44 0a 20 49 ff c1 4c 89 09 c3 90 <4c> 8b 04 24 65 48 8b 05 44 41 9e 7e 65 8b 0d 49 41 9e 7e f7 c1 00
RSP: 0018:ffff8881ce2d6b40 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff8881ce2d6c88 RBX: 000000000000000f RCX: 0000000000080000
RDX: ffffc90002547000 RSI: 0000000000000010 RDI: 000000000000000f
RBP: 0000000000000010 R08: ffffffff8153c4cf R09: ffff8881ce2d6bf0
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff11039c5ad91
R13: 000000000000000e R14: dffffc0000000000 R15: 1ffff11039c5ad92
stack_trace_consume_entry+0x162/0x240 kernel/stacktrace.c:94
arch_stack_walk+0x105/0x140 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123
save_stack+0x95/0x880 mm/page_owner.c:122
__set_page_owner+0x33/0x1e0 mm/page_owner.c:191
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]
__kmalloc+0x19b/0x2e0 mm/slub.c:3909
__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]
kvmalloc_array include/linux/mm.h:779 [inline]
__ptr_ring_init_queue_alloc include/linux/ptr_ring.h:470 [inline]
ptr_ring_init include/linux/ptr_ring.h:488 [inline]
skb_array_init include/linux/skb_array.h:182 [inline]
pfifo_fast_init+0x240/0x760 net/sched/sch_generic.c:784
qdisc_create_dflt+0x129/0x250 net/sched/sch_generic.c:944
mq_init+0x2c8/0x6b0 net/sched/sch_mq.c:90
qdisc_create_dflt+0x129/0x250 net/sched/sch_generic.c:944
attach_default_qdiscs net/sched/sch_generic.c:1113 [inline]
dev_activate+0x11f/0xc00 net/sched/sch_generic.c:1154
__dev_open+0x302/0x420 net/core/dev.c:1335
__dev_change_flags+0x1db/0x6e0 net/core/dev.c:7958
dev_change_flags+0x87/0x190 net/core/dev.c:8029
dev_ifsioc+0x104/0xa60 net/core/dev_ioctl.c:226
dev_ioctl+0x505/0xb40 net/core/dev_ioctl.c:483
sock_do_ioctl+0x295/0x3a0 net/socket.c:1081
sock_ioctl+0x4a4/0x760 net/socket.c:1198
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
RIP: 0033:0x7ffb71b46169
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:00007ffb701b0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffb71d5efa0 RCX: 00007ffb71b46169
RDX: 0000400000002280 RSI: 0000000000008914 RDI: 000000000000000a
RBP: 00007ffb71bc72a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffb71d5efa0 R15: 00007ffeeb7aaf88
The buggy address belongs to the page:
page:ffffea0007a35d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0
flags: 0x8000000000010000(head)
raw: 8000000000010000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x140dc0(GFP_USER|__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_large include/linux/slab.h:485 [inline]
kmalloc include/linux/slab.h:549 [inline]
kzalloc include/linux/slab.h:690 [inline]
tipc_nametbl_init+0x94/0x260 net/tipc/name_table.c:738
tipc_init_net+0x22d/0x360 net/tipc/core.c:74
ops_init+0x1d4/0x4a0 net/core/net_namespace.c:141
setup_net+0x214/0x990 net/core/net_namespace.c:348
copy_net_ns+0x30d/0x510 net/core/net_namespace.c:489
create_new_namespaces+0x47a/0x570 kernel/nsproxy.c:103
copy_namespaces+0x169/0x1b0 kernel/nsproxy.c:161
copy_process+0x12da/0x3230 kernel/fork.c:2055
_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
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:
ffff8881e8d77080: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
ffff8881e8d77100: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>ffff8881e8d77180: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
^
ffff8881e8d77200: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
ffff8881e8d77280: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1e7972067 P4D 1e7972067 PUD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1509 Comm: syz.4.298 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: ffff8881e9e80000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881e8d771c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff9f28
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e8d771c0
FS: 00007ffb701b06c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d4b51000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
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
RIP: 0010:__sanitizer_cov_trace_cmp4+0x0/0x70 kernel/kcov.c:248
Code: 28 4c 39 d0 77 cf 89 f8 89 f6 48 c7 44 0a 08 02 00 00 00 48 89 44 0a 10 48 89 74 0a 18 4c 89 44 0a 20 49 ff c1 4c 89 09 c3 90 <4c> 8b 04 24 65 48 8b 05 44 41 9e 7e 65 8b 0d 49 41 9e 7e f7 c1 00
RSP: 0018:ffff8881ce2d6b40 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff8881ce2d6c88 RBX: 000000000000000f RCX: 0000000000080000
RDX: ffffc90002547000 RSI: 0000000000000010 RDI: 000000000000000f
RBP: 0000000000000010 R08: ffffffff8153c4cf R09: ffff8881ce2d6bf0
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff11039c5ad91
R13: 000000000000000e R14: dffffc0000000000 R15: 1ffff11039c5ad92
stack_trace_consume_entry+0x162/0x240 kernel/stacktrace.c:94
arch_stack_walk+0x105/0x140 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123
save_stack+0x95/0x880 mm/page_owner.c:122
__set_page_owner+0x33/0x1e0 mm/page_owner.c:191
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]
__kmalloc+0x19b/0x2e0 mm/slub.c:3909
__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]
kvmalloc_array include/linux/mm.h:779 [inline]
__ptr_ring_init_queue_alloc include/linux/ptr_ring.h:470 [inline]
ptr_ring_init include/linux/ptr_ring.h:488 [inline]
skb_array_init include/linux/skb_array.h:182 [inline]
pfifo_fast_init+0x240/0x760 net/sched/sch_generic.c:784
qdisc_create_dflt+0x129/0x250 net/sched/sch_generic.c:944
mq_init+0x2c8/0x6b0 net/sched/sch_mq.c:90
qdisc_create_dflt+0x129/0x250 net/sched/sch_generic.c:944
attach_default_qdiscs net/sched/sch_generic.c:1113 [inline]
dev_activate+0x11f/0xc00 net/sched/sch_generic.c:1154
__dev_open+0x302/0x420 net/core/dev.c:1335
__dev_change_flags+0x1db/0x6e0 net/core/dev.c:7958
dev_change_flags+0x87/0x190 net/core/dev.c:8029
dev_ifsioc+0x104/0xa60 net/core/dev_ioctl.c:226
dev_ioctl+0x505/0xb40 net/core/dev_ioctl.c:483
sock_do_ioctl+0x295/0x3a0 net/socket.c:1081
sock_ioctl+0x4a4/0x760 net/socket.c:1198
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
RIP: 0033:0x7ffb71b46169
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:00007ffb701b0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffb71d5efa0 RCX: 00007ffb71b46169
RDX: 0000400000002280 RSI: 0000000000008914 RDI: 000000000000000a
RBP: 00007ffb71bc72a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffb71d5efa0 R15: 00007ffeeb7aaf88
Modules linked in:
CR2: 0000000000000000
---[ end trace db8ee5f4c3cda35d ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010206
RAX: ffffffff8154e8ca RBX: 0000000000000100 RCX: ffff8881e9e80000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881e8d771c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff9f28
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e8d771c0
FS: 00007ffb701b06c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d4b51000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 28 4c 39 d0 sub %cl,-0x30(%rcx,%rdi,1)
4: 77 cf ja 0xffffffd5
6: 89 f8 mov %edi,%eax
8: 89 f6 mov %esi,%esi
a: 48 c7 44 0a 08 02 00 movq $0x2,0x8(%rdx,%rcx,1)
11: 00 00
13: 48 89 44 0a 10 mov %rax,0x10(%rdx,%rcx,1)
18: 48 89 74 0a 18 mov %rsi,0x18(%rdx,%rcx,1)
1d: 4c 89 44 0a 20 mov %r8,0x20(%rdx,%rcx,1)
22: 49 ff c1 inc %r9
25: 4c 89 09 mov %r9,(%rcx)
28: c3 ret
29: 90 nop
* 2a: 4c 8b 04 24 mov (%rsp),%r8 <-- trapping instruction
2e: 65 48 8b 05 44 41 9e mov %gs:0x7e9e4144(%rip),%rax # 0x7e9e417a
35: 7e
36: 65 8b 0d 49 41 9e 7e mov %gs:0x7e9e4149(%rip),%ecx # 0x7e9e4186
3d: f7 .byte 0xf7
3e: c1 .byte 0xc1