==================================================================
BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:791 [inline]
BUG: KASAN: use-after-free in detach_timer kernel/time/timer.c:824 [inline]
BUG: KASAN: use-after-free in expire_timers kernel/time/timer.c:1452 [inline]
BUG: KASAN: use-after-free in __run_timers+0x7be/0xbe0 kernel/time/timer.c:1787
Write of size 8 at addr ffff8881a2ac71c8 by task kworker/u4:1/2187
CPU: 0 PID: 2187 Comm: kworker/u4:1 Not tainted 5.4.265-syzkaller-00033-g4d7b888b5774 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Workqueue: netns cleanup_net
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
do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1086
Allocated by task 16332:
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
dup_fd+0x6d/0xaa0 fs/file.c:280
copy_files+0xe1/0x1f0 kernel/fork.c:1485
copy_process+0x11e3/0x3230 kernel/fork.c:2040
_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 9129:
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
do_exit+0xc78/0x2bc0 kernel/exit.c:854
do_group_exit+0x138/0x300 kernel/exit.c:982
get_signal+0xdb1/0x1440 kernel/signal.c:2735
do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159
prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
The buggy address belongs to the object at ffff8881a2ac70c0
which belongs to the cache files_cache of size 704
The buggy address is located 264 bytes inside of
704-byte region [ffff8881a2ac70c0, ffff8881a2ac7380)
The buggy address belongs to the page:
page:ffffea00068ab100 refcount:1 mapcount:0 mapping:ffff8881f5cfa280 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5cfa280
raw: 0000000000000000 0000000000130013 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 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]
kmem_cache_alloc+0x109/0x250 mm/slub.c:2842
dup_fd+0x6d/0xaa0 fs/file.c:280
copy_files+0xe1/0x1f0 kernel/fork.c:1485
copy_process+0x11e3/0x3230 kernel/fork.c:2040
_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: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:
ffff8881a2ac7080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
ffff8881a2ac7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881a2ac7180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881a2ac7200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881a2ac7280: 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 1dddcf067 P4D 1dddcf067 PUD 1dddce067 PMD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 2187 Comm: kworker/u4:1 Tainted: G B 5.4.265-syzkaller-00033-g4d7b888b5774 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Workqueue: netns cleanup_net
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d78 EFLAGS: 00010202
RAX: ffffffff8154e38a RBX: 0000000000000101 RCX: ffff8881ec375e80
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881a2ac71c0
RBP: ffff8881f6e09f28 R08: ffffffff8154dfce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 0000000100018260
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881a2ac71c0
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001dddb6000 CR4: 00000000003406b0
DR0: ffffffff00000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
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
do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1086
Modules linked in:
CR2: 0000000000000000
---[ end trace 496061957977029e ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d78 EFLAGS: 00010202
RAX: ffffffff8154e38a RBX: 0000000000000101 RCX: ffff8881ec375e80
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881a2ac71c0
RBP: ffff8881f6e09f28 R08: ffffffff8154dfce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 0000000100018260
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881a2ac71c0
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001dddb6000 CR4: 00000000003406b0
DR0: ffffffff00000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600