Hello, syzbot found the following issue on: HEAD commit: 80cb3fb61135 Merge branch 'for-next/core', remote-tracking.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=15485780580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b9f31443a725c681 dashboard link: https://syzkaller.appspot.com/bug?extid=204a4382fcb3311f3858 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b1e78177ae84/disk-80cb3fb6.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/656db61d4272/vmlinux-80cb3fb6.xz kernel image: https://storage.googleapis.com/syzbot-assets/e5b0b3f63a30/Image-80cb3fb6.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+204a4382fcb3311f3858@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: slab-use-after-free in page_pool_put_unrefed_netmem+0x8b8/0x11f4 Read of size 8 at addr ffff0000c924c708 by task syz-executor/7103 CPU: 0 UID: 0 PID: 7103 Comm: syz-executor Not tainted 6.12.0-rc1-syzkaller-g80cb3fb61135 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:319 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:326 __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x198/0x538 mm/kasan/report.c:488 kasan_report+0xd8/0x138 mm/kasan/report.c:601 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 page_pool_put_unrefed_netmem+0x8b8/0x11f4 page_pool_put_netmem include/net/page_pool/helpers.h:323 [inline] page_pool_put_full_page include/net/page_pool/helpers.h:368 [inline] __xdp_return+0x3b8/0x760 net/core/xdp.c:387 xdp_return_frame+0x94/0x2cc net/core/xdp.c:422 tun_do_read+0x4dc/0x13b8 drivers/net/tun.c:2246 tun_chr_read_iter+0x114/0x25c drivers/net/tun.c:2274 new_sync_read fs/read_write.c:488 [inline] vfs_read+0x740/0x970 fs/read_write.c:569 ksys_read+0x15c/0x26c fs/read_write.c:712 __do_sys_read fs/read_write.c:722 [inline] __se_sys_read fs/read_write.c:720 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:720 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:732 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:750 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Allocated by task 7090: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:257 [inline] __kmalloc_cache_node_noprof+0x274/0x3b8 mm/slub.c:4308 kmalloc_node_noprof include/linux/slab.h:901 [inline] page_pool_create_percpu+0x94/0xa48 net/core/page_pool.c:335 page_pool_create+0x24/0x34 net/core/page_pool.c:364 xdp_test_run_setup net/bpf/test_run.c:182 [inline] bpf_test_run_xdp_live+0x27c/0x1a90 net/bpf/test_run.c:382 bpf_prog_test_run_xdp+0x6a0/0xfc4 net/bpf/test_run.c:1317 bpf_prog_test_run+0x294/0x33c kernel/bpf/syscall.c:4247 __sys_bpf+0x314/0x5f0 kernel/bpf/syscall.c:5652 __do_sys_bpf kernel/bpf/syscall.c:5741 [inline] __se_sys_bpf kernel/bpf/syscall.c:5739 [inline] __arm64_sys_bpf+0x80/0x98 kernel/bpf/syscall.c:5739 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:732 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:750 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Freed by task 6473: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x64/0x8c mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2343 [inline] slab_free mm/slub.c:4580 [inline] kfree+0x184/0x47c mm/slub.c:4728 __page_pool_destroy net/core/page_pool.c:1018 [inline] page_pool_release+0x780/0x820 net/core/page_pool.c:1056 page_pool_release_retry+0x30/0x24c net/core/page_pool.c:1068 process_one_work+0x7bc/0x1600 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3391 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 __kasan_record_aux_stack+0xd0/0xec mm/kasan/generic.c:541 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:551 insert_work+0x54/0x2d4 kernel/workqueue.c:2183 __queue_work+0xe20/0x1308 kernel/workqueue.c:2339 delayed_work_timer_fn+0x74/0x90 kernel/workqueue.c:2485 call_timer_fn+0x1b4/0x8e8 kernel/time/timer.c:1794 expire_timers kernel/time/timer.c:1840 [inline] __run_timers kernel/time/timer.c:2419 [inline] __run_timer_base+0x59c/0x7b4 kernel/time/timer.c:2430 run_timer_base kernel/time/timer.c:2439 [inline] run_timer_softirq+0xcc/0x194 kernel/time/timer.c:2449 handle_softirqs+0x2e0/0xbf8 kernel/softirq.c:554 __do_softirq+0x14/0x20 kernel/softirq.c:588 The buggy address belongs to the object at ffff0000c924c000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1800 bytes inside of freed 2048-byte region [ffff0000c924c000, ffff0000c924c800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109248 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0002000 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000080008 00000001f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0002000 dead000000000100 dead000000000122 head: 0000000000000000 0000000000080008 00000001f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc3249201 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c924c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c924c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000c924c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c924c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c924c800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
