refcount_t: addition on 0; use-after-free. WARNING: CPU: 1 PID: 6189 at lib/refcount.c:25 refcount_warn_saturate+0x180/0x1c8 lib/refcount.c:25 Modules linked in: CPU: 1 PID: 6189 Comm: syz-executor.5 Not tainted 6.2.0-rc3-syzkaller-16387-g9598c377d828 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : refcount_warn_saturate+0x180/0x1c8 lib/refcount.c:25 lr : refcount_warn_saturate+0x180/0x1c8 lib/refcount.c:25 sp : ffff80001447bae0 x29: ffff80001447bae0 x28: 00000000002e0003 x27: 00000000000008a0 x26: ffff00010caa9000 x25: 0000000000000000 x24: ffff000117828680 x23: ffff80000b2901b0 x22: 0000000000000000 x21: ffff0001178285c0 x20: 0000000000000002 x19: ffff80000daff000 x18: 000000000000ba7e x17: 000000000000b67e x16: ffff80000dd86118 x15: ffff000117528000 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff000117528000 x11: ff808000081cbbc8 x10: 0000000000000000 x9 : b965a11b0be64600 x8 : b965a11b0be64600 x7 : ffff80000816c254 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000006 x1 : 0000000100000000 x0 : 000000000000002a Call trace: refcount_warn_saturate+0x180/0x1c8 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:775 [inline] nr_release+0x218/0x274 net/netrom/af_netrom.c:520 __sock_release net/socket.c:650 [inline] sock_close+0x50/0xf0 net/socket.c:1365 __fput+0x198/0x3e4 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x100/0x148 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x2b8/0xc2c kernel/exit.c:867 do_group_exit+0x98/0xcc kernel/exit.c:1012 get_signal+0xac4/0xb34 kernel/signal.c:2859 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1081 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1134 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 irq event stamp: 2026 hardirqs last enabled at (2025): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1370 [inline] hardirqs last enabled at (2025): [] finish_lock_switch+0x94/0xe8 kernel/sched/core.c:5003 hardirqs last disabled at (2026): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (216): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (214): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ ODEBUG: assert_init not available (active state 0) object: 0000000052edc113 object type: timer_list hint: 0xffff0001171a3580 WARNING: CPU: 0 PID: 6189 at lib/debugobjects.c:512 debug_print_object lib/debugobjects.c:509 [inline] WARNING: CPU: 0 PID: 6189 at lib/debugobjects.c:512 debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 Modules linked in: CPU: 0 PID: 6189 Comm: syz-executor.5 Tainted: G W 6.2.0-rc3-syzkaller-16387-g9598c377d828 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : debug_print_object lib/debugobjects.c:509 [inline] pc : debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 lr : debug_print_object lib/debugobjects.c:509 [inline] lr : debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 sp : ffff80001447b9e0 x29: ffff80001447b9e0 x28: 00000000002e0003 x27: 00000000000008a0 x26: ffff00010caa9000 x25: 0000000000000000 x24: ffff000117828680 x23: ffff80000f2c4d50 x22: ffff80000d51c000 x21: ffff80000f2e4000 x20: ffff80000c15f8a0 x19: ffff0001171a3570 x18: 000000000000ba7e x17: 000000000000b67e x16: ffff80000dd86118 x15: ffff000117528000 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff000117528000 x11: ff808000081cbbc8 x10: 0000000000000000 x9 : b965a11b0be64600 x8 : b965a11b0be64600 x7 : ffff80000816c254 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff0001fefbff08 x1 : 0000000100000000 x0 : 000000000000007c Call trace: debug_print_object lib/debugobjects.c:509 [inline] debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 debug_timer_assert_init kernel/time/timer.c:792 [inline] debug_assert_init kernel/time/timer.c:837 [inline] __timer_delete+0x3c/0x1cc kernel/time/timer.c:1321 timer_delete+0x24/0x34 kernel/time/timer.c:1361 del_timer include/linux/timer.h:213 [inline] sk_stop_timer+0x24/0xb4 net/core/sock.c:3370 nr_stop_t1timer+0x24/0x34 net/netrom/nr_timer.c:84 nr_disconnect+0x24/0xc0 net/netrom/nr_subr.c:261 nr_release+0x178/0x274 net/netrom/af_netrom.c:529 __sock_release net/socket.c:650 [inline] sock_close+0x50/0xf0 net/socket.c:1365 __fput+0x198/0x3e4 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x100/0x148 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x2b8/0xc2c kernel/exit.c:867 do_group_exit+0x98/0xcc kernel/exit.c:1012 get_signal+0xac4/0xb34 kernel/signal.c:2859 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1081 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1134 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 irq event stamp: 2262 hardirqs last enabled at (2261): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1370 [inline] hardirqs last enabled at (2261): [] finish_lock_switch+0x94/0xe8 kernel/sched/core.c:5003 hardirqs last disabled at (2262): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (2208): [] spin_unlock_bh include/linux/spinlock.h:395 [inline] softirqs last enabled at (2208): [] lock_sock_nested+0xc0/0xd8 net/core/sock.c:3477 softirqs last disabled at (2204): [] spin_lock_bh include/linux/spinlock.h:355 [inline] softirqs last disabled at (2204): [] lock_sock_nested+0x88/0xd8 net/core/sock.c:3473 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ ODEBUG: assert_init not available (active state 0) object: 0000000016cb474f object type: timer_list hint: 0x0 WARNING: CPU: 1 PID: 6189 at lib/debugobjects.c:512 debug_print_object lib/debugobjects.c:509 [inline] WARNING: CPU: 1 PID: 6189 at lib/debugobjects.c:512 debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 Modules linked in: CPU: 1 PID: 6189 Comm: syz-executor.5 Tainted: G W 6.2.0-rc3-syzkaller-16387-g9598c377d828 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : debug_print_object lib/debugobjects.c:509 [inline] pc : debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 lr : debug_print_object lib/debugobjects.c:509 [inline] lr : debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 sp : ffff80001447b9e0 x29: ffff80001447b9e0 x28: 00000000002e0003 x27: 00000000000008a0 x26: ffff00010caa9000 x25: 0000000000000000 x24: ffff000117828680 x23: ffff80000f2c4d50 x22: ffff80000d51c000 x21: ffff80000f2e4000 x20: ffff80000c15f8a0 x19: ffff0001171a35c0 x18: 000000000000ba7e x17: 3030303030203a74 x16: ffff80000dd86118 x15: ffff000117528000 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff000117528000 x11: ff808000081cbbc8 x10: 0000000000000000 x9 : b965a11b0be64600 x8 : b965a11b0be64600 x7 : ffff80000c11ee8c x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000000 x0 : 000000000000006d Call trace: debug_print_object lib/debugobjects.c:509 [inline] debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 debug_timer_assert_init kernel/time/timer.c:792 [inline] debug_assert_init kernel/time/timer.c:837 [inline] __timer_delete+0x3c/0x1cc kernel/time/timer.c:1321 timer_delete+0x24/0x34 kernel/time/timer.c:1361 del_timer include/linux/timer.h:213 [inline] sk_stop_timer+0x24/0xb4 net/core/sock.c:3370 nr_stop_t2timer+0x24/0x34 net/netrom/nr_timer.c:89 nr_disconnect+0x2c/0xc0 net/netrom/nr_subr.c:262 nr_release+0x178/0x274 net/netrom/af_netrom.c:529 __sock_release net/socket.c:650 [inline] sock_close+0x50/0xf0 net/socket.c:1365 __fput+0x198/0x3e4 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x100/0x148 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x2b8/0xc2c kernel/exit.c:867 do_group_exit+0x98/0xcc kernel/exit.c:1012 get_signal+0xac4/0xb34 kernel/signal.c:2859 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1081 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1134 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 irq event stamp: 2516 hardirqs last enabled at (2515): [] __up_console_sem+0xb0/0xfc kernel/printk/printk.c:344 hardirqs last disabled at (2516): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (2486): [] _stext+0x2e4/0x37c softirqs last disabled at (2267): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ ODEBUG: assert_init not available (active state 0) object: 000000007f8cac46 object type: timer_list hint: 0xdead4ead00000000 WARNING: CPU: 1 PID: 6189 at lib/debugobjects.c:512 debug_print_object lib/debugobjects.c:509 [inline] WARNING: CPU: 1 PID: 6189 at lib/debugobjects.c:512 debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 Modules linked in: CPU: 1 PID: 6189 Comm: syz-executor.5 Tainted: G W 6.2.0-rc3-syzkaller-16387-g9598c377d828 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : debug_print_object lib/debugobjects.c:509 [inline] pc : debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 lr : debug_print_object lib/debugobjects.c:509 [inline] lr : debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 sp : ffff80001447b9e0 x29: ffff80001447b9e0 x28: 00000000002e0003 x27: 00000000000008a0 x26: ffff00010caa9000 x25: 0000000000000000 x24: ffff000117828680 x23: ffff80000f2c4d50 x22: ffff80000d51c000 x21: ffff80000f2e4000 x20: ffff80000c15f8a0 x19: ffff0001171a3610 x18: 000000000000ba7e x17: 3030303030203a74 x16: ffff80000dd86118 x15: ffff000117528000 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff000117528000 x11: ff808000081cbbc8 x10: 0000000000000000 x9 : b965a11b0be64600 x8 : b965a11b0be64600 x7 : ffff80000c11ee8c x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000000 x0 : 000000000000007c Call trace: debug_print_object lib/debugobjects.c:509 [inline] debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 debug_timer_assert_init kernel/time/timer.c:792 [inline] debug_assert_init kernel/time/timer.c:837 [inline] __timer_delete+0x3c/0x1cc kernel/time/timer.c:1321 timer_delete+0x24/0x34 kernel/time/timer.c:1361 del_timer include/linux/timer.h:213 [inline] sk_stop_timer+0x24/0xb4 net/core/sock.c:3370 nr_stop_t4timer+0x24/0x34 net/netrom/nr_timer.c:94 nr_disconnect+0x34/0xc0 net/netrom/nr_subr.c:263 nr_release+0x178/0x274 net/netrom/af_netrom.c:529 __sock_release net/socket.c:650 [inline] sock_close+0x50/0xf0 net/socket.c:1365 __fput+0x198/0x3e4 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x100/0x148 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x2b8/0xc2c kernel/exit.c:867 do_group_exit+0x98/0xcc kernel/exit.c:1012 get_signal+0xac4/0xb34 kernel/signal.c:2859 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1081 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1134 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 irq event stamp: 2830 hardirqs last enabled at (2829): [] __up_console_sem+0xb0/0xfc kernel/printk/printk.c:344 hardirqs last disabled at (2830): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (2800): [] _stext+0x2e4/0x37c softirqs last disabled at (2521): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ ODEBUG: assert_init not available (active state 0) object: 0000000073a1696d object type: timer_list hint: 0xffff0001171a3670 WARNING: CPU: 0 PID: 6189 at lib/debugobjects.c:512 debug_print_object lib/debugobjects.c:509 [inline] WARNING: CPU: 0 PID: 6189 at lib/debugobjects.c:512 debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 Modules linked in: CPU: 0 PID: 6189 Comm: syz-executor.5 Tainted: G W 6.2.0-rc3-syzkaller-16387-g9598c377d828 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : debug_print_object lib/debugobjects.c:509 [inline] pc : debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 lr : debug_print_object lib/debugobjects.c:509 [inline] lr : debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 sp : ffff80001447b9e0 x29: ffff80001447b9e0 x28: 00000000002e0003 x27: 00000000000008a0 x26: ffff00010caa9000 x25: 0000000000000000 x24: ffff000117828680 x23: ffff80000f2c4d50 x22: ffff80000d51c000 x21: ffff80000f2e4000 x20: ffff80000c15f8a0 x19: ffff0001171a3660 x18: 0000000000000382 x17: 0000000000000000 x16: ffff80000dd86118 x15: ffff000117528000 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff000117528000 x11: ff808000081cbbc8 x10: 0000000000000000 x9 : b965a11b0be64600 x8 : b965a11b0be64600 x7 : ffff80000816c254 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000006 x1 : 0000000100000000 x0 : 000000000000007c Call trace: debug_print_object lib/debugobjects.c:509 [inline] debug_object_assert_init+0x148/0x19c lib/debugobjects.c:899 debug_timer_assert_init kernel/time/timer.c:792 [inline] debug_assert_init kernel/time/timer.c:837 [inline] __timer_delete+0x3c/0x1cc kernel/time/timer.c:1321 timer_delete+0x24/0x34 kernel/time/timer.c:1361 del_timer include/linux/timer.h:213 [inline] sk_stop_timer+0x24/0xb4 net/core/sock.c:3370 nr_stop_idletimer+0x24/0x34 net/netrom/nr_timer.c:99 nr_disconnect+0x3c/0xc0 net/netrom/nr_subr.c:264 nr_release+0x178/0x274 net/netrom/af_netrom.c:529 __sock_release net/socket.c:650 [inline] sock_close+0x50/0xf0 net/socket.c:1365 __fput+0x198/0x3e4 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x100/0x148 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x2b8/0xc2c kernel/exit.c:867 do_group_exit+0x98/0xcc kernel/exit.c:1012 get_signal+0xac4/0xb34 kernel/signal.c:2859 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1081 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1134 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 irq event stamp: 3022 hardirqs last enabled at (3021): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1370 [inline] hardirqs last enabled at (3021): [] finish_lock_switch+0x94/0xe8 kernel/sched/core.c:5003 hardirqs last disabled at (3022): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (2988): [] _stext+0x2e4/0x37c softirqs last disabled at (2835): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 ---[ 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: 1 PID: 6189 Comm: syz-executor.5 Tainted: G W 6.2.0-rc3-syzkaller-16387-g9598c377d828 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:163 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 assign_lock_key+0x134/0x140 kernel/locking/lockdep.c:981 register_lock_class+0xc4/0x2f8 kernel/locking/lockdep.c:1294 __lock_acquire+0xa8/0x3084 kernel/locking/lockdep.c:4934 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5668 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x6c/0xb4 kernel/locking/spinlock.c:162 skb_dequeue net/core/skbuff.c:3467 [inline] skb_queue_purge+0x28/0xc0 net/core/skbuff.c:3505 nr_clear_queues net/netrom/nr_subr.c:36 [inline] nr_disconnect+0x4c/0xc0 net/netrom/nr_subr.c:266 nr_release+0x178/0x274 net/netrom/af_netrom.c:529 __sock_release net/socket.c:650 [inline] sock_close+0x50/0xf0 net/socket.c:1365 __fput+0x198/0x3e4 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x100/0x148 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x2b8/0xc2c kernel/exit.c:867 do_group_exit+0x98/0xcc kernel/exit.c:1012 get_signal+0xac4/0xb34 kernel/signal.c:2859 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1081 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1134 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 6189 at lib/refcount.c:28 refcount_warn_saturate+0x1a0/0x1c8 lib/refcount.c:28 Modules linked in: CPU: 1 PID: 6189 Comm: syz-executor.5 Tainted: G W 6.2.0-rc3-syzkaller-16387-g9598c377d828 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : refcount_warn_saturate+0x1a0/0x1c8 lib/refcount.c:28 lr : refcount_warn_saturate+0x1a0/0x1c8 lib/refcount.c:28 sp : ffff80001447bae0 x29: ffff80001447bae0 x28: 00000000002e0003 x27: 00000000000008a0 x26: ffff00010caa9000 x25: 0000000000000000 x24: ffff000117828680 x23: ffff80000b2901b0 x22: 0000000000000000 x21: 0000000000000000 x20: 0000000000000003 x19: ffff80000daff000 x18: 0000000000000121 x17: ffff80000c15d8bc x16: 0000000000000001 x15: 0000000000000000 x14: 0000000000000000 x13: 205d393831365420 x12: 5b5d343035303232 x11: ff808000081cbbc8 x10: 0000000000000000 x9 : b965a11b0be64600 x8 : b965a11b0be64600 x7 : 205b5d3430353032 x6 : ffff80000c11ee8c x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000026 Call trace: refcount_warn_saturate+0x1a0/0x1c8 lib/refcount.c:28 __refcount_sub_and_test include/linux/refcount.h:283 [inline] __refcount_dec_and_test include/linux/refcount.h:315 [inline] refcount_dec_and_test include/linux/refcount.h:333 [inline] sock_put include/net/sock.h:1990 [inline] nr_release+0x22c/0x274 net/netrom/af_netrom.c:554 __sock_release net/socket.c:650 [inline] sock_close+0x50/0xf0 net/socket.c:1365 __fput+0x198/0x3e4 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x100/0x148 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x2b8/0xc2c kernel/exit.c:867 do_group_exit+0x98/0xcc kernel/exit.c:1012 get_signal+0xac4/0xb34 kernel/signal.c:2859 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1081 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1134 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 irq event stamp: 3344 hardirqs last enabled at (3343): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (3343): [] _raw_spin_unlock_irqrestore+0x48/0x8c kernel/locking/spinlock.c:194 hardirqs last disabled at (3344): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (3344): [] _raw_spin_lock_irqsave+0xa4/0xb4 kernel/locking/spinlock.c:162 softirqs last enabled at (3334): [] _stext+0x2e4/0x37c softirqs last disabled at (3025): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 ---[ end trace 0000000000000000 ]---