Hello, syzbot found the following issue on: HEAD commit: 42234a752679 Merge branch 'for-next/core' into for-kernelci 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=1351201b280000 kernel config: https://syzkaller.appspot.com/x/.config?x=e95897d034d60fb8 dashboard link: https://syzkaller.appspot.com/bug?extid=c689847e27e0fa3e7a5d compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f608eaee38d2/disk-42234a75.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/266fc376435a/vmlinux-42234a75.xz kernel image: https://storage.googleapis.com/syzbot-assets/464f23f26a65/Image-42234a75.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c689847e27e0fa3e7a5d@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 0 PID: 7887 at lib/refcount.c:25 refcount_warn_saturate+0x1a8/0x20c lib/refcount.c:25 Modules linked in: CPU: 0 PID: 7887 Comm: kworker/0:9 Not tainted 6.4.0-rc7-syzkaller-g42234a752679 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Workqueue: events sco_sock_timeout pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : refcount_warn_saturate+0x1a8/0x20c lib/refcount.c:25 lr : refcount_warn_saturate+0x1a8/0x20c lib/refcount.c:25 sp : ffff800099ca7af0 x29: ffff800099ca7af0 x28: ffff0001b423c600 x27: ffff0000d2d42218 x26: ffff0000cb783250 x25: 1fffe0001a5a8443 x24: dfff800000000000 x23: dfff800000000000 x22: 0000000000000000 x21: 0000000000000002 x20: ffff0000dd30a080 x19: ffff800090b09000 x18: ffff800099ca6fc0 x17: 0000000000000000 x16: ffff80008a443320 x15: 0000000000000003 x14: 0000000000000000 x13: fffffffffffdc038 x12: 0000000000000001 x11: 0000000000000001 x10: 0000000000000000 x9 : fd2dea7152733000 x8 : fd2dea7152733000 x7 : fffffffffffdc038 x6 : fffffffffffdbfe8 x5 : ffff800099ca73d8 x4 : ffff80008df78f00 x3 : ffff800080597614 x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000 Call trace: refcount_warn_saturate+0x1a8/0x20c lib/refcount.c:25 __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] sock_hold include/net/sock.h:777 [inline] sco_sock_timeout+0x19c/0x25c net/bluetooth/sco.c:89 process_one_work+0x788/0x12d4 kernel/workqueue.c:2405 worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2552 kthread+0x288/0x310 kernel/kthread.c:379 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:853 irq event stamp: 183728 hardirqs last enabled at (183727): [<ffff800080351108>] __up_console_sem+0x60/0xb4 kernel/printk/printk.c:347 hardirqs last disabled at (183728): [<ffff80008a43ed34>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:407 softirqs last enabled at (183698): [<ffff8000803a4f6c>] local_bh_enable+0xc/0x2c include/linux/bottom_half.h:32 softirqs last disabled at (183694): [<ffff8000803a4f40>] local_bh_disable+0xc/0x2c include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- INFO: trying to register non-static key. The code is fine but needs lockdep annotation, or maybe you didn't initialize this object before use? turning off the locking correctness validator. CPU: 0 PID: 7887 Comm: kworker/0:9 Tainted: G W 6.4.0-rc7-syzkaller-g42234a752679 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Workqueue: events sco_sock_timeout Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 assign_lock_key+0x234/0x268 kernel/locking/lockdep.c:982 register_lock_class+0x144/0x6a4 kernel/locking/lockdep.c:1295 __lock_acquire+0x184/0x7604 kernel/locking/lockdep.c:4965 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5705 lock_sock_nested+0x5c/0x11c net/core/sock.c:3469 lock_sock include/net/sock.h:1709 [inline] sco_sock_timeout+0xbc/0x25c net/bluetooth/sco.c:97 process_one_work+0x788/0x12d4 kernel/workqueue.c:2405 worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2552 kthread+0x288/0x310 kernel/kthread.c:379 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:853 ================================================================== BUG: KASAN: slab-out-of-bounds in sco_sock_timeout+0xe8/0x25c net/bluetooth/sco.c:99 Read of size 8 at addr ffff0000dd30a4a0 by task kworker/0:9/7887 CPU: 0 PID: 7887 Comm: kworker/0:9 Tainted: G W 6.4.0-rc7-syzkaller-g42234a752679 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Workqueue: events sco_sock_timeout Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:351 [inline] print_report+0x174/0x514 mm/kasan/report.c:462 kasan_report+0xd4/0x130 mm/kasan/report.c:572 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 sco_sock_timeout+0xe8/0x25c net/bluetooth/sco.c:99 process_one_work+0x788/0x12d4 kernel/workqueue.c:2405 worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2552 kthread+0x288/0x310 kernel/kthread.c:379 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:853 Allocated by task 25544: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:510 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] __do_kmalloc_node mm/slab_common.c:966 [inline] __kmalloc+0xcc/0x1b8 mm/slab_common.c:979 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:680 [inline] ops_init+0x90/0x548 net/core/net_namespace.c:126 setup_net+0x424/0xaac net/core/net_namespace.c:339 copy_net_ns+0x3c4/0x644 net/core/net_namespace.c:491 create_new_namespaces+0x344/0x614 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x108/0x158 kernel/nsproxy.c:228 ksys_unshare+0x45c/0x874 kernel/fork.c:3441 __do_sys_unshare kernel/fork.c:3512 [inline] __se_sys_unshare kernel/fork.c:3510 [inline] __arm64_sys_unshare+0x3c/0x50 kernel/fork.c:3510 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x244 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:191 el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:491 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:501 __call_rcu_common kernel/rcu/tree.c:2627 [inline] call_rcu+0x104/0xaf4 kernel/rcu/tree.c:2741 netlink_release+0x12c0/0x1818 net/netlink/af_netlink.c:828 __sock_release net/socket.c:653 [inline] sock_release+0x84/0x140 net/socket.c:681 netlink_kernel_release+0x50/0x70 net/netlink/af_netlink.c:2098 nfnetlink_net_exit_batch+0x6c/0xb4 net/netfilter/nfnetlink.c:782 ops_exit_list net/core/net_namespace.c:175 [inline] cleanup_net+0x5dc/0x8d0 net/core/net_namespace.c:614 process_one_work+0x788/0x12d4 kernel/workqueue.c:2405 worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2552 kthread+0x288/0x310 kernel/kthread.c:379 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:853 Second to last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:491 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:501 __call_rcu_common kernel/rcu/tree.c:2627 [inline] call_rcu+0x104/0xaf4 kernel/rcu/tree.c:2741 netlink_release+0x12c0/0x1818 net/netlink/af_netlink.c:828 __sock_release net/socket.c:653 [inline] sock_close+0xb8/0x1fc net/socket.c:1397 __fput+0x30c/0x7bc fs/file_table.c:321 ____fput+0x20/0x30 fs/file_table.c:349 task_work_run+0x230/0x2e0 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x63c/0x1f58 kernel/exit.c:874 do_group_exit+0x194/0x22c kernel/exit.c:1024 get_signal+0x14b0/0x159c kernel/signal.c:2876 do_signal arch/arm64/kernel/signal.c:1249 [inline] do_notify_resume+0x3cc/0x3c90 arch/arm64/kernel/signal.c:1302 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:144 [inline] el0_svc+0x94/0x160 arch/arm64/kernel/entry-common.c:648 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 The buggy address belongs to the object at ffff0000dd30a000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes to the right of allocated 1056-byte region [ffff0000dd30a000, ffff0000dd30a420) The buggy address belongs to the physical page: page:0000000078acc899 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11d308 head:0000000078acc899 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 05ffc00000010200 ffff0000c0002900 fffffc00035a2400 dead000000000002 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000dd30a380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000dd30a400: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000dd30a480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000dd30a500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000dd30a580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Mem abort info: ESR = 0x0000000086000006 EC = 0x21: IABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault user pgtable: 4k pages, 48-bit VAs, pgdp=00000001662e9000 [0000000000000000] pgd=080000011715b003, p4d=080000011715b003, pud=0000000000000000 Internal error: Oops: 0000000086000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 7887 Comm: kworker/0:9 Tainted: G B W 6.4.0-rc7-syzkaller-g42234a752679 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Workqueue: events sco_sock_timeout pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : 0x0 lr : sco_sock_timeout+0xf4/0x25c net/bluetooth/sco.c:99 sp : ffff800099ca7b20 x29: ffff800099ca7b20 x28: ffff0001b423c600 x27: ffff0000d2d42218 x26: ffff0000cb783250 x25: 1fffe0001a5a8443 x24: dfff800000000000 x23: dfff800000000000 x22: 0000000000000000 x21: ffff0000cb783208 x20: ffff0000dd30a000 x19: ffff0000dd30a080 x18: 1fffe000368447c6 x17: ffff80008debd000 x16: ffff80008a441e20 x15: 0000000000000002 x14: 0000000000000000 x13: 0000000040000002 x12: 0000000000000001 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : 0000000000000000 x7 : 1fffe000368447c7 x6 : ffff80008028cc04 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000801b9aec x2 : 0000000000000001 x1 : 0000000000000000 x0 : ffff0000dd30a000 Call trace: 0x0 process_one_work+0x788/0x12d4 kernel/workqueue.c:2405 worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2552 kthread+0x288/0x310 kernel/kthread.c:379 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:853 Code: ???????? ???????? ???????? ???????? (????????) ---[ end trace 0000000000000000 ]--- --- 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 bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
