==================================================================
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:1452 [inline]
BUG: KASAN: slab-out-of-bounds in __run_timers+0x7be/0xbe0 kernel/time/timer.c:1787
Write of size 8 at addr ffff8881e0c9b1c8 by task syz-executor.3/18703
CPU: 1 PID: 18703 Comm: syz-executor.3 Not tainted 5.4.265-syzkaller-00009-g43a5ead9254d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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:1452 [inline]
__run_timers+0x7be/0xbe0 kernel/time/timer.c:1787
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1800
__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:538 [inline]
smp_apic_timer_interrupt+0x11a/0x460 arch/x86/kernel/apic/apic.c:1149
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
Allocated by task 18768:
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
kmalloc include/linux/slab.h:556 [inline]
kzalloc include/linux/slab.h:690 [inline]
device_private_init drivers/base/core.c:2750 [inline]
device_add+0xb6/0xbb0 drivers/base/core.c:2800
netdev_register_kobject+0x176/0x310 net/core/net-sysfs.c:1854
register_netdevice+0xbc5/0x12a0 net/core/dev.c:9182
register_netdev+0x37/0x50 net/core/dev.c:9311
sit_init_net+0x229/0x430 net/ipv6/sit.c:1868
ops_init+0x1d4/0x4a0 net/core/net_namespace.c:138
setup_net+0x214/0x990 net/core/net_namespace.c:345
copy_net_ns+0x30f/0x510 net/core/net_namespace.c:486
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
Freed by task 0:
(stack is not available)
The buggy address belongs to the object at ffff8881e0c9b000
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 200 bytes to the right of
256-byte region [ffff8881e0c9b000, ffff8881e0c9b100)
The buggy address belongs to the page:
page:ffffea0007832680 refcount:1 mapcount:0 mapping:ffff8881f5c02780 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5c02780
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__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:4891
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 include/linux/slab.h:561 [inline]
kzalloc include/linux/slab.h:690 [inline]
new_dir fs/proc/proc_sysctl.c:973 [inline]
get_subdir fs/proc/proc_sysctl.c:1018 [inline]
__register_sysctl_table+0x983/0x11d0 fs/proc/proc_sysctl.c:1361
__addrconf_sysctl_register+0x28f/0x3e0 net/ipv6/addrconf.c:6946
addrconf_sysctl_register+0x128/0x180 net/ipv6/addrconf.c:6993
ipv6_add_dev+0xb34/0x10a0 net/ipv6/addrconf.c:444
addrconf_notify+0x59b/0xe50 net/ipv6/addrconf.c:3539
notifier_call_chain kernel/notifier.c:98 [inline]
__raw_notifier_call_chain kernel/notifier.c:399 [inline]
raw_notifier_call_chain+0x95/0x110 kernel/notifier.c:406
call_netdevice_notifiers_info net/core/dev.c:1670 [inline]
call_netdevice_notifiers_extack net/core/dev.c:1682 [inline]
call_netdevice_notifiers net/core/dev.c:1696 [inline]
register_netdevice+0xeef/0x12a0 net/core/dev.c:9213
__ip_tunnel_create+0x2b0/0x370 net/ipv4/ip_tunnel.c:267
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:4953 [inline]
__free_pages+0x91/0x140 mm/page_alloc.c:4959
tipc_exit_net+0x92/0xf0 net/tipc/core.c:108
ops_exit_list net/core/net_namespace.c:179 [inline]
cleanup_net+0x665/0xc90 net/core/net_namespace.c:609
process_one_work+0x765/0xd20 kernel/workqueue.c:2290
worker_thread+0xaef/0x1470 kernel/workqueue.c:2436
kthread+0x2da/0x360 kernel/kthread.c:288
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354
Memory state around the buggy address:
ffff8881e0c9b080: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
ffff8881e0c9b100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881e0c9b180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8881e0c9b200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8881e0c9b280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
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: 18703 Comm: syz-executor.3 Tainted: G B 5.4.265-syzkaller-00009-g43a5ead9254d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010202
RAX: ffffffff8154e38a RBX: 0000000000000101 RCX: ffff8881ebee4ec0
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e0c9b1c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154dfce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 000000010000cbf0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e0c9b1c0
FS: 0000000020000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ece43000 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:1418
expire_timers kernel/time/timer.c:1463 [inline]
__run_timers+0x879/0xbe0 kernel/time/timer.c:1787
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1800
__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:538 [inline]
smp_apic_timer_interrupt+0x11a/0x460 arch/x86/kernel/apic/apic.c:1149
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
Modules linked in:
CR2: 0000000000000000
---[ end trace c211b5a693d77a38 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010202
RAX: ffffffff8154e38a RBX: 0000000000000101 RCX: ffff8881ebee4ec0
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e0c9b1c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154dfce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 000000010000cbf0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e0c9b1c0
FS: 0000000020000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ece43000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400