Hello, syzbot found the following issue on: HEAD commit: 568035b01cfb Linux 6.0-rc1 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=10c0a92d080000 kernel config: https://syzkaller.appspot.com/x/.config?x=3cb39b084894e9a5 dashboard link: https://syzkaller.appspot.com/bug?extid=dc34dd8e1a7a138b88ac compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+dc34dd8e1a7a138b88ac@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: out-of-bounds in schedule_debug kernel/sched/core.c:5736 [inline] BUG: KASAN: out-of-bounds in __schedule+0x2114/0x26f0 kernel/sched/core.c:6388 Read of size 8 at addr ffffc900015f8000 by task kworker/u4:1/237 CPU: 1 PID: 237 Comm: kworker/u4:1 Not tainted 6.0.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x59/0x719 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 schedule_debug kernel/sched/core.c:5736 [inline] __schedule+0x2114/0x26f0 kernel/sched/core.c:6388 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6663 __cond_resched+0x13/0x20 kernel/sched/core.c:8299 might_resched include/linux/kernel.h:110 [inline] might_alloc include/linux/sched/mm.h:274 [inline] slab_pre_alloc_hook mm/slab.h:700 [inline] slab_alloc_node mm/slub.c:3157 [inline] slab_alloc mm/slub.c:3251 [inline] __kmem_cache_alloc_lru mm/slub.c:3258 [inline] kmem_cache_alloc+0x2fe/0x4a0 mm/slub.c:3268 prepare_kernel_cred+0x27/0x890 kernel/cred.c:717 call_usermodehelper_exec_async+0x10e/0x580 kernel/umh.c:91 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK> The buggy address belongs to stack of task kworker/u4:1/237 The buggy address belongs to the virtual mapping at [ffffc900015f8000, ffffc90001601000) created by: kernel_clone+0xe7/0xab0 kernel/fork.c:2673 The buggy address belongs to the physical page: page:ffffea0004396940 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10e5a5 flags: 0x200000000000000(node=0|zone=2) raw: 0200000000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 26, tgid 26 (kworker/u4:1), ts 6964925972, free_ts 0 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x11cc/0x2a20 mm/page_alloc.c:4283 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5515 __alloc_pages_bulk+0x9a1/0x1400 mm/page_alloc.c:5463 alloc_pages_bulk_array_mempolicy+0x1b3/0x360 mm/mempolicy.c:2365 vm_area_alloc_pages mm/vmalloc.c:2930 [inline] __vmalloc_area_node mm/vmalloc.c:3026 [inline] __vmalloc_node_range+0x576/0x13a0 mm/vmalloc.c:3196 alloc_thread_stack_node kernel/fork.c:312 [inline] dup_task_struct kernel/fork.c:977 [inline] copy_process+0x13c0/0x6de0 kernel/fork.c:2087 kernel_clone+0xe7/0xab0 kernel/fork.c:2673 user_mode_thread+0xad/0xe0 kernel/fork.c:2742 call_usermodehelper_exec_work kernel/umh.c:174 [inline] call_usermodehelper_exec_work+0xcc/0x180 kernel/umh.c:160 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2ea/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 page_owner free stack trace missing Memory state around the buggy address: ffffc900015f7f00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc900015f7f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 >ffffc900015f8000: 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffffc900015f8080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc900015f8100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== --- 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.
