Hello, syzbot found the following issue on: HEAD commit: 2c22dc1ee3a1 Merge tag 'mailbox-v6.13' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12143778580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8df9bf3383f5970 dashboard link: https://syzkaller.appspot.com/bug?extid=9f9ccb1c9235f3d44d53 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15184f5f980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16143778580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9137c3e19e21/disk-2c22dc1e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1aad80837d89/vmlinux-2c22dc1e.xz kernel image: https://storage.googleapis.com/syzbot-assets/d7979d71d6d2/bzImage-2c22dc1e.xz The issue was bisected to: commit e6720779ae612a14ac4ba7fe4fd5b27d900d932c Author: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx> Date: Tue Oct 1 19:46:10 2024 +0000 Bluetooth: SCO: Use kref to track lifetime of sco_conn bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16d47778580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=15d47778580000 console output: https://syzkaller.appspot.com/x/log.txt?x=11d47778580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9f9ccb1c9235f3d44d53@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: e6720779ae61 ("Bluetooth: SCO: Use kref to track lifetime of sco_conn") ================================================================== BUG: KASAN: slab-use-after-free in timer_is_static_object+0x35/0x80 kernel/time/timer.c:733 Read of size 8 at addr ffff888027af7ea0 by task syz-executor215/15489 CPU: 1 UID: 0 PID: 15489 Comm: syz-executor215 Not tainted 6.12.0-syzkaller-09435-g2c22dc1ee3a1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 timer_is_static_object+0x35/0x80 kernel/time/timer.c:733 lookup_object_or_alloc lib/debugobjects.c:679 [inline] debug_object_assert_init+0x236/0x4b0 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+0xad/0x380 kernel/time/timer.c:1412 del_timer include/linux/timer.h:202 [inline] try_to_grab_pending kernel/workqueue.c:2064 [inline] work_grab_pending+0x157/0xae0 kernel/workqueue.c:2157 __cancel_work+0xbb/0x390 kernel/workqueue.c:4322 sco_sock_clear_timer net/bluetooth/sco.c:180 [inline] sco_sock_shutdown+0x155/0x3f0 net/bluetooth/sco.c:1273 __sys_shutdown_sock net/socket.c:2423 [inline] __sys_shutdown net/socket.c:2439 [inline] __do_sys_shutdown net/socket.c:2444 [inline] __se_sys_shutdown net/socket.c:2442 [inline] __x64_sys_shutdown+0x13f/0x1a0 net/socket.c:2442 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8530977559 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 19 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:00007f853010d208 EFLAGS: 00000246 ORIG_RAX: 0000000000000030 RAX: ffffffffffffffda RBX: 00007f8530a07198 RCX: 00007f8530977559 RDX: 00007f8530952796 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007f8530a07190 R08: 00007ffd066c2117 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f85309ce2c0 R13: 00007f8530a0719c R14: 00007ffd066c2030 R15: 00007ffd066c2118 </TASK> Allocated by task 15453: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x243/0x390 mm/slub.c:4314 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] sco_conn_add+0xa7/0x360 net/bluetooth/sco.c:199 sco_connect net/bluetooth/sco.c:336 [inline] sco_sock_connect+0x323/0x990 net/bluetooth/sco.c:645 __sys_connect_file net/socket.c:2055 [inline] __sys_connect+0x288/0x2d0 net/socket.c:2074 __do_sys_connect net/socket.c:2080 [inline] __se_sys_connect net/socket.c:2077 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2077 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 15473: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2338 [inline] slab_free mm/slub.c:4598 [inline] kfree+0x196/0x420 mm/slub.c:4746 sco_chan_del+0xa3/0x180 net/bluetooth/sco.c:236 sco_sock_shutdown+0x164/0x3f0 net/bluetooth/sco.c:1274 __sys_shutdown_sock net/socket.c:2423 [inline] __sys_shutdown net/socket.c:2439 [inline] __do_sys_shutdown net/socket.c:2444 [inline] __se_sys_shutdown net/socket.c:2442 [inline] __x64_sys_shutdown+0x13f/0x1a0 net/socket.c:2442 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888027af7e00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 160 bytes inside of freed 256-byte region [ffff888027af7e00, ffff888027af7f00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27af6 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801ac41b40 ffffea0000c24d80 dead000000000006 raw: 0000000000000000 0000000000100010 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801ac41b40 ffffea0000c24d80 dead000000000006 head: 0000000000000000 0000000000100010 00000001f5000000 0000000000000000 head: 00fff00000000001 ffffea00009ebd81 ffffffffffffffff 0000000000000000 head: 0000000000000002 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 1, tgid 1 (swapper/0), ts 7753338606, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0x363e/0x3790 mm/page_alloc.c:3474 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4751 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x140 mm/slub.c:2408 allocate_slab+0x5a/0x2f0 mm/slub.c:2574 new_slab mm/slub.c:2627 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3815 __slab_alloc+0x58/0xa0 mm/slub.c:3905 __slab_alloc_node mm/slub.c:3980 [inline] slab_alloc_node mm/slub.c:4141 [inline] __kmalloc_cache_noprof+0x27b/0x390 mm/slub.c:4309 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] bus_add_driver+0x163/0x670 drivers/base/bus.c:659 driver_register+0x23a/0x320 drivers/base/driver.c:246 do_one_initcall+0x248/0x880 init/main.c:1266 do_initcall_level+0x157/0x210 init/main.c:1328 do_initcalls+0x3f/0x80 init/main.c:1344 kernel_init_freeable+0x435/0x5d0 init/main.c:1577 kernel_init+0x1d/0x2b0 init/main.c:1466 page_owner free stack trace missing Memory state around the buggy address: ffff888027af7d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888027af7e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888027af7e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888027af7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888027af7f80: 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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
