Hello, syzbot found the following issue on: HEAD commit: 28eb75e178d3 Merge tag 'drm-next-2024-11-21' of https://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1156fec0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=2406be795e8a5f4 dashboard link: https://syzkaller.appspot.com/bug?extid=4bab29ea59a63b8b33b1 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14a3d6e8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d656bfec363b/disk-28eb75e1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/24f43f097510/vmlinux-28eb75e1.xz kernel image: https://storage.googleapis.com/syzbot-assets/5d84a86858b1/bzImage-28eb75e1.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4bab29ea59a63b8b33b1@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: slab-use-after-free in timer_is_static_object+0x80/0x90 kernel/time/timer.c:733 Read of size 8 at addr ffff88807a901ca0 by task syz.1.23344/23262 CPU: 0 UID: 0 PID: 23262 Comm: syz.1.23344 Not tainted 6.12.0-syzkaller-07749-g28eb75e178d3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 timer_is_static_object+0x80/0x90 kernel/time/timer.c:733 lookup_object_or_alloc.part.0+0x416/0x590 lib/debugobjects.c:679 lookup_object_or_alloc lib/debugobjects.c:665 [inline] debug_object_assert_init+0x268/0x2f0 lib/debugobjects.c:1008 debug_timer_assert_init kernel/time/timer.c:845 [inline] debug_assert_init kernel/time/timer.c:890 [inline] __timer_delete+0x81/0x1c0 kernel/time/timer.c:1412 del_timer include/linux/timer.h:202 [inline] try_to_grab_pending+0x7d/0x850 kernel/workqueue.c:2064 work_grab_pending kernel/workqueue.c:2157 [inline] __cancel_work+0xac/0x370 kernel/workqueue.c:4322 sco_sock_clear_timer+0x4f/0xe0 net/bluetooth/sco.c:180 sco_sock_close net/bluetooth/sco.c:522 [inline] sco_sock_release+0x67/0x2d0 net/bluetooth/sco.c:1298 __sock_release+0xb0/0x270 net/socket.c:640 sock_close+0x1c/0x30 net/socket.c:1408 __fput+0x3f8/0xb60 fs/file_table.c:450 task_work_run+0x14e/0x250 kernel/task_work.c:239 get_signal+0x1d3/0x26c0 kernel/signal.c:2789 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f96dd37e819 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f96de0aa038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 00007f96dd535fa0 RCX: 00007f96dd37e819 RDX: 0000000000000008 RSI: 0000000020001580 RDI: 0000000000000004 RBP: 00007f96dd3f175e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f96dd535fa0 R15: 00007ffcbc3e10f8 </TASK> Allocated by task 23070: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kmalloc_noprof include/linux/slab.h:879 [inline] kzalloc_noprof include/linux/slab.h:1015 [inline] sco_conn_add net/bluetooth/sco.c:199 [inline] sco_conn_add+0xc8/0x410 net/bluetooth/sco.c:184 sco_connect net/bluetooth/sco.c:336 [inline] sco_sock_connect+0x325/0xbd0 net/bluetooth/sco.c:645 __sys_connect_file+0x13e/0x1a0 net/socket.c:2055 __sys_connect+0x14f/0x170 net/socket.c:2074 __do_sys_connect net/socket.c:2080 [inline] __se_sys_connect net/socket.c:2077 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2077 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 23070: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x14f/0x4b0 mm/slub.c:4727 sco_conn_free net/bluetooth/sco.c:97 [inline] kref_put include/linux/kref.h:65 [inline] sco_conn_put+0x2cd/0x4c0 net/bluetooth/sco.c:107 sco_chan_del+0x9c/0x1b0 net/bluetooth/sco.c:236 __sco_sock_close+0xab/0x210 net/bluetooth/sco.c:508 sco_sock_close net/bluetooth/sco.c:523 [inline] sco_sock_release+0x6f/0x2d0 net/bluetooth/sco.c:1298 __sock_release+0xb0/0x270 net/socket.c:640 sock_close+0x1c/0x30 net/socket.c:1408 __fput+0x3f8/0xb60 fs/file_table.c:450 task_work_run+0x14e/0x250 kernel/task_work.c:239 get_signal+0x1d3/0x26c0 kernel/signal.c:2789 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807a901c00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 160 bytes inside of freed 256-byte region [ffff88807a901c00, ffff88807a901d00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807a900200 pfn:0x7a900 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801b041b40 ffff88801b040708 ffffea0001d81190 raw: ffff88807a900200 000000000010000a 00000001f5000000 0000000000000000 head: 00fff00000000240 ffff88801b041b40 ffff88801b040708 ffffea0001d81190 head: ffff88807a900200 000000000010000a 00000001f5000000 0000000000000000 head: 00fff00000000001 ffffea0001ea4001 ffffffffffffffff 0000000000000000 head: ffff888000000002 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5848, tgid 5848 (syz-executor), ts 72198926581, free_ts 72169629294 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474 __alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4751 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 alloc_slab_page mm/slub.c:2412 [inline] allocate_slab mm/slub.c:2578 [inline] new_slab+0x2c9/0x410 mm/slub.c:2631 ___slab_alloc+0xdac/0x1880 mm/slub.c:3818 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3908 __slab_alloc_node mm/slub.c:3961 [inline] slab_alloc_node mm/slub.c:4122 [inline] __kmalloc_cache_noprof+0x2b4/0x300 mm/slub.c:4290 kmalloc_noprof include/linux/slab.h:879 [inline] kzalloc_noprof include/linux/slab.h:1015 [inline] ____ip_mc_inc_group+0x3ee/0x1000 net/ipv4/igmp.c:1468 __ip_mc_inc_group net/ipv4/igmp.c:1503 [inline] ip_mc_inc_group net/ipv4/igmp.c:1509 [inline] ip_mc_up+0x154/0x3b0 net/ipv4/igmp.c:1808 inetdev_event+0xafd/0x18a0 net/ipv4/devinet.c:1638 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] __dev_notify_flags+0x12d/0x2e0 net/core/dev.c:8982 dev_change_flags+0x10c/0x160 net/core/dev.c:9020 do_setlink.constprop.0+0x69c/0x3f70 net/core/rtnetlink.c:3103 page last free pid 5841 tgid 5841 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x661/0x1080 mm/page_alloc.c:2657 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4085 [inline] slab_alloc_node mm/slub.c:4134 [inline] kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4141 getname_flags.part.0+0x4c/0x550 fs/namei.c:139 getname_flags include/linux/audit.h:322 [inline] getname+0x8d/0xe0 fs/namei.c:223 do_sys_openat2+0x104/0x1e0 fs/open.c:1396 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1428 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88807a901b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807a901c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807a901c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807a901d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807a901d80: 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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
