==================================================================
BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:814 [inline]
BUG: KASAN: use-after-free in enqueue_timer+0xb7/0x300 kernel/time/timer.c:541
Write of size 8 at addr ffff8881dd62f1c8 by task syz-executor.4/1301
CPU: 1 PID: 1301 Comm: syz-executor.4 Not tainted 5.4.274-syzkaller-00002-g6f97bd951d82 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
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_add_head include/linux/list.h:814 [inline]
enqueue_timer+0xb7/0x300 kernel/time/timer.c:541
__internal_add_timer kernel/time/timer.c:554 [inline]
internal_add_timer+0x240/0x430 kernel/time/timer.c:604
__mod_timer+0x6f1/0x13e0 kernel/time/timer.c:1065
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: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
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x4d/0x80 kernel/locking/spinlock.c:191
Code: 74 0c 48 c7 c7 90 3b eb 85 e8 ef 12 43 fd 48 83 3d 47 2d 9a 01 00 74 36 48 89 df e8 5d e8 fa fc 66 90 4c 89 34 24 ff 34 24 9d 01 00 00 00 e8 d9 d4 f3 fc 65 8b 05 1e 7f b1 7b 85 c0 74 08 48
RSP: 0018:ffff8881e2cff820 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: ffffffff86ec6d40 RCX: dffffc0000000000
RDX: ffffc90000f45000 RSI: 0000000000000246 RDI: ffffffff86ec6d40
RBP: ffff8881e2cff910 R08: ffffffff8187505c R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 1ffff1103c59ff10
R13: dffffc0000000000 R14: 0000000000000246 R15: ffffc9000017c000
bpf_array_free_percpu kernel/bpf/arraymap.c:24 [inline]
bpf_array_alloc_percpu kernel/bpf/arraymap.c:38 [inline]
array_map_alloc+0x4e8/0x6d0 kernel/bpf/arraymap.c:133
find_and_alloc_map kernel/bpf/syscall.c:122 [inline]
map_create kernel/bpf/syscall.c:573 [inline]
__do_sys_bpf kernel/bpf/syscall.c:2873 [inline]
__se_sys_bpf+0x3291/0xbcb0 kernel/bpf/syscall.c:2849
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7fa7071540a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa7064ad0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fa70728b050 RCX: 00007fa7071540a9
RDX: 0000000000000048 RSI: 00000000200009c0 RDI: 0000000000000000
RBP: 00007fa7071c3074 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fa70728b050 R15: 00007fff9b345048
Allocated by task 520:
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
slab_post_alloc_hook mm/slab.h:584 [inline]
slab_alloc_node mm/slub.c:2829 [inline]
slab_alloc mm/slub.c:2837 [inline]
kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842
getname_flags+0xb8/0x4e0 fs/namei.c:141
getname fs/namei.c:212 [inline]
__do_sys_unlink fs/namei.c:4259 [inline]
__se_sys_unlink fs/namei.c:4257 [inline]
__x64_sys_unlink+0x38/0x50 fs/namei.c:4257
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Freed by task 520:
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+0x1b5/0x270 mm/kasan/common.c:487
slab_free_hook mm/slub.c:1455 [inline]
slab_free_freelist_hook mm/slub.c:1494 [inline]
slab_free mm/slub.c:3080 [inline]
kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096
putname fs/namei.c:262 [inline]
do_unlinkat+0x7e8/0x8b0 fs/namei.c:4233
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
The buggy address belongs to the object at ffff8881dd62e600
which belongs to the cache names_cache of size 4096
The buggy address is located 3016 bytes inside of
4096-byte region [ffff8881dd62e600, ffff8881dd62f600)
The buggy address belongs to the page:
page:ffffea0007758a00 refcount:1 mapcount:0 mapping:ffff8881f5d04f00 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5d04f00
raw: 0000000000000000 0000000000070007 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+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]
kmem_cache_alloc+0x109/0x250 mm/slub.c:2842
getname_flags+0xb8/0x4e0 fs/namei.c:141
user_path_at_empty+0x28/0x50 fs/namei.c:2703
user_path_at include/linux/namei.h:49 [inline]
vfs_statx+0x115/0x210 fs/stat.c:187
vfs_fstatat include/linux/fs.h:3380 [inline]
__do_sys_newfstatat fs/stat.c:367 [inline]
__se_sys_newfstatat+0xce/0x770 fs/stat.c:361
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
htab_free_elems kernel/bpf/hashtab.c:116 [inline]
prealloc_destroy kernel/bpf/hashtab.c:194 [inline]
htab_map_free+0x515/0x670 kernel/bpf/hashtab.c:1235
bpf_map_free_deferred+0xa8/0x100 kernel/bpf/syscall.c:311
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:
ffff8881dd62f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881dd62f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881dd62f180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881dd62f200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881dd62f280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1e2b62067 P4D 1e2b62067 PUD 1d46fc067 PMD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1332 Comm: syz-executor.2 Tainted: G B 5.4.274-syzkaller-00002-g6f97bd951d82 #0
Hardware name: Google Google Compute Engine/Google Compute Engine,
----------------
Code disassembly (best guess):
0: 74 0c je 0xe
2: 48 c7 c7 90 3b eb 85 mov $0xffffffff85eb3b90,%rdi
9: e8 ef 12 43 fd call 0xfd4312fd
e: 48 83 3d 47 2d 9a 01 cmpq $0x0,0x19a2d47(%rip) # 0x19a2d5d
15: 00
16: 74 36 je 0x4e
18: 48 89 df mov %rbx,%rdi
1b: e8 5d e8 fa fc call 0xfcfae87d
20: 66 90 xchg %ax,%ax
22: 4c 89 34 24 mov %r14,(%rsp)
26: ff 34 24 push (%rsp)
29: 9d popf
* 2a: bf 01 00 00 00 mov $0x1,%edi <-- trapping instruction
2f: e8 d9 d4 f3 fc call 0xfcf3d50d
34: 65 8b 05 1e 7f b1 7b mov %gs:0x7bb17f1e(%rip),%eax # 0x7bb17f59
3b: 85 c0 test %eax,%eax
3d: 74 08 je 0x47
3f: 48 rex.W