==================================================================
BUG: KASAN: slab-out-of-bounds in hlist_move_list include/linux/list.h:852 [inline]
BUG: KASAN: slab-out-of-bounds in __collect_expired_timers kernel/time/timer.c:1484 [inline]
BUG: KASAN: slab-out-of-bounds in collect_expired_timers kernel/time/timer.c:1719 [inline]
BUG: KASAN: slab-out-of-bounds in __run_timers+0x4a8/0x6b0 kernel/time/timer.c:1783
Write of size 8 at addr ffff8881e89b31c8 by task swapper/1/0
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.210-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18e/0x1d5 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_move_list include/linux/list.h:852 [inline]
__collect_expired_timers kernel/time/timer.c:1484 [inline]
collect_expired_timers kernel/time/timer.c:1719 [inline]
__run_timers+0x4a8/0x6b0 kernel/time/timer.c:1783
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:831
RIP: 0010:default_idle+0x1f/0x30 arch/x86/kernel/process.c:573
Code: 90 90 90 90 90 90 90 90 90 90 90 e8 9b 2c fd fd bf 01 00 00 00 89 c6 e8 6f 28 07 fd 0f 1f 44 00 00 0f 00 2d 13 69 65 00 fb f4 7c 2c fd fd bf ff ff ff ff 89 c6 e9 50 28 07 fd 41 57 41 56 53
RSP: 0018:ffff8881f5df7e88 EFLAGS: 000002d6 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: ffff8881f5dc0fc0 RCX: ffff8881f5dc0fc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: dffffc0000000000 R08: ffffffff821d1134 R09: ffffed103ebb81f9
R10: ffffed103ebb81f9 R11: 1ffff1103ebb81f8 R12: 0000000000000000
R13: 1ffff1103ebb81f8 R14: ffffffff860694e0 R15: 0000000000000001
default_idle_call kernel/sched/idle.c:94 [inline]
cpuidle_idle_call kernel/sched/idle.c:154 [inline]
do_idle+0x1d2/0x590 kernel/sched/idle.c:264
cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:356
start_secondary+0x312/0x390 arch/x86/kernel/smpboot.c:264
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241
Allocated by task 155:
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
__kasan_kmalloc+0x131/0x1e0 mm/kasan/common.c:529
kmalloc include/linux/slab.h:556 [inline]
kzalloc include/linux/slab.h:690 [inline]
kernfs_iop_get_link+0x63/0x560 fs/kernfs/symlink.c:135
vfs_readlink+0x135/0x3a0 fs/namei.c:4815
do_readlinkat+0x23e/0x330 fs/stat.c:410
__do_sys_readlink fs/stat.c:431 [inline]
__se_sys_readlink fs/stat.c:428 [inline]
__x64_sys_readlink+0x7b/0x90 fs/stat.c:428
do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Freed by task 155:
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
kasan_set_free_info mm/kasan/common.c:345 [inline]
__kasan_slab_free+0x178/0x240 mm/kasan/common.c:487
slab_free_hook mm/slub.c:1455 [inline]
slab_free_freelist_hook+0x80/0x150 mm/slub.c:1494
slab_free mm/slub.c:3080 [inline]
kfree+0xc6/0x260 mm/slub.c:4071
do_delayed_call include/linux/delayed_call.h:28 [inline]
vfs_readlink+0x210/0x3a0 fs/namei.c:4820
do_readlinkat+0x23e/0x330 fs/stat.c:410
__do_sys_readlink fs/stat.c:431 [inline]
__se_sys_readlink fs/stat.c:428 [inline]
__x64_sys_readlink+0x7b/0x90 fs/stat.c:428
do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x44/0xa9
The buggy address belongs to the object at ffff8881e89b2000
which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 456 bytes to the right of
4096-byte region [ffff8881e89b2000, ffff8881e89b3000)
The buggy address belongs to the page:
page:ffffea0007a26c00 refcount:1 mapcount:0 mapping:ffff8881f5c0c280 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5c0c280
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, 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+0x194/0x380 mm/page_alloc.c:2171
get_page_from_freelist+0x524/0x560 mm/page_alloc.c:3794
__alloc_pages_nodemask+0x2ab/0x6f0 mm/page_alloc.c:4857
alloc_slab_page+0x39/0x3e0 mm/slub.c:343
allocate_slab mm/slub.c:1683 [inline]
new_slab+0x97/0x450 mm/slub.c:1749
new_slab_objects mm/slub.c:2505 [inline]
___slab_alloc+0x320/0x4a0 mm/slub.c:2667
__slab_alloc+0x5a/0x90 mm/slub.c:2707
slab_alloc_node mm/slub.c:2792 [inline]
slab_alloc mm/slub.c:2837 [inline]
__kmalloc+0x197/0x2b0 mm/slub.c:3909
kmalloc include/linux/slab.h:561 [inline]
kzalloc include/linux/slab.h:690 [inline]
ops_init+0x86/0x350 net/core/net_namespace.c:127
setup_net+0x1bb/0x9e0 net/core/net_namespace.c:338
copy_net_ns+0x31a/0x510 net/core/net_namespace.c:479
create_new_namespaces+0x4e3/0x5f0 kernel/nsproxy.c:103
copy_namespaces+0x169/0x1b0 kernel/nsproxy.c:161
copy_process+0x12a4/0x31f0 kernel/fork.c:2044
_do_fork+0x142/0x7f0 kernel/fork.c:2391
__do_sys_clone kernel/fork.c:2549 [inline]
__se_sys_clone kernel/fork.c:2530 [inline]
__x64_sys_clone+0x213/0x260 kernel/fork.c:2530
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+0x7ee/0x920 mm/page_alloc.c:1438
free_the_page mm/page_alloc.c:4919 [inline]
__free_pages+0x45/0x1e0 mm/page_alloc.c:4925
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
tun_set_iff+0xc0b/0x1050 drivers/net/tun.c:2917
__tun_chr_ioctl+0x6c7/0x1b70 drivers/net/tun.c:3160
do_vfs_ioctl+0x6d1/0x15b0 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+0x44/0xa9
Memory state around the buggy address:
ffff8881e89b3080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881e89b3100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881e89b3180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8881e89b3200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881e89b3280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1de1a7067 P4D 1de1a7067 PUD 1de1a6067 PMD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 0 Comm: swapper/1 Tainted: G B 5.4.210-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d30 EFLAGS: 00010202
RAX: ffffffff8151cbb9 RBX: 0000000000000101 RCX: ffff8881f5dc0fc0
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e89b31c0
RBP: ffff8881e89b31e0 R08: ffffffff8151c992 R09: fffffbfff0d7370d
R10: fffffbfff0d7370d R11: 1ffffffff0d7370c R12: 00000000ffffa1e0
R13: 1ffff1103ede92f1 R14: 0000000000000000 R15: ffff8881e89b31c0
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001de1a4000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
call_timer_fn+0x31/0x350 kernel/time/timer.c:1418
expire_timers+0x21e/0x400 kernel/time/timer.c:1463
__run_timers+0x5b0/0x6b0 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:831
RIP: 0010:default_idle+0x1f/0x30 arch/x86/kernel/process.c:573
Code: 90 90 90 90 90 90 90 90 90 90 90 e8 9b 2c fd fd bf 01 00 00 00 89 c6 e8 6f 28 07 fd 0f 1f 44 00 00 0f 00 2d 13 69 65 00 fb f4 7c 2c fd fd bf ff ff ff ff 89 c6 e9 50 28 07 fd 41 57 41 56 53
RSP: 0018:ffff8881f5df7e88 EFLAGS: 000002d6 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: ffff8881f5dc0fc0 RCX: ffff8881f5dc0fc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: dffffc0000000000 R08: ffffffff821d1134 R09: ffffed103ebb81f9
R10: ffffed103ebb81f9 R11: 1ffff1103ebb81f8 R12: 0000000000000000
R13: 1ffff1103ebb81f8 R14: ffffffff860694e0 R15: 0000000000000001
default_idle_call kernel/sched/idle.c:94 [inline]
cpuidle_idle_call kernel/sched/idle.c:154 [inline]
do_idle+0x1d2/0x590 kernel/sched/idle.c:264
cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:356
start_secondary+0x312/0x390 arch/x86/kernel/smpboot.c:264
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241
Modules linked in:
CR2: 0000000000000000
---[ end trace b81cecdfe0e855ce ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d30 EFLAGS: 00010202
RAX: ffffffff8151cbb9 RBX: 0000000000000101 RCX: ffff8881f5dc0fc0
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e89b31c0
RBP: ffff8881e89b31e0 R08: ffffffff8151c992 R09: fffffbfff0d7370d
R10: fffffbfff0d7370d R11: 1ffffffff0d7370c R12: 00000000ffffa1e0
R13: 1ffff1103ede92f1 R14: 0000000000000000 R15: ffff8881e89b31c0
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001de1a4000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: e8 9b 2c fd fd callq 0xfdfd2cab
10: bf 01 00 00 00 mov $0x1,%edi
15: 89 c6 mov %eax,%esi
17: e8 6f 28 07 fd callq 0xfd07288b
1c: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
21: 0f 00 2d 13 69 65 00 verw 0x656913(%rip) # 0x65693b
28: fb sti
29: f4 hlt
* 2a: e8 7c 2c fd fd callq 0xfdfd2cab <-- trapping instruction
2f: bf ff ff ff ff mov $0xffffffff,%edi
34: 89 c6 mov %eax,%esi
36: e9 50 28 07 fd jmpq 0xfd07288b
3b: 41 57 push %r15
3d: 41 56 push %r14
3f: 53 push %rbx