------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 1 PID: 4440 at lib/refcount.c:25 refcount_warn_saturate+0x180/0x1c8 lib/refcount.c:25 Modules linked in: CPU: 1 PID: 4440 Comm: syz-executor.1 Not tainted 6.1.0-rc6-syzkaller-32653-g65762d97e6fa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 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 : ffff8000140cbae0 x29: ffff8000140cbae0 x28: 00000000002e0003 x27: 0000000000000000 x26: ffff0000caa9e270 x25: 0000000000000000 x24: ffff000111d07980 x23: ffff80000b2414cc x22: 0000000000000000 x21: ffff000111d078c0 x20: 0000000000000002 x19: ffff80000d990000 x18: 00000000000003dc x17: ffff80000c0ed83c x16: ffff80000dc18158 x15: ffff00011385cec0 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff00011385cec0 x11: ff808000081c4d40 x10: 0000000000000000 x9 : 0e2baa477f130f00 x8 : 0e2baa477f130f00 x7 : ffff80000816678c x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff0001fefddcc8 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:771 [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+0x2dc/0xcac kernel/exit.c:820 do_group_exit+0x98/0xcc kernel/exit.c:950 get_signal+0xabc/0xb2c kernel/signal.c:2858 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1071 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1124 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: 4102 hardirqs last enabled at (4101): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1366 [inline] hardirqs last enabled at (4101): [] finish_lock_switch+0x94/0xe8 kernel/sched/core.c:4968 hardirqs last disabled at (4102): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (2862): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (2860): [] 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 type: timer_list hint: nr_t1timer_expiry+0x0/0x1e0 net/netrom/nr_timer.c:46 WARNING: CPU: 0 PID: 4440 at lib/debugobjects.c:505 debug_print_object lib/debugobjects.c:502 [inline] WARNING: CPU: 0 PID: 4440 at lib/debugobjects.c:505 debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 Modules linked in: CPU: 0 PID: 4440 Comm: syz-executor.1 Tainted: G W 6.1.0-rc6-syzkaller-32653-g65762d97e6fa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : debug_print_object lib/debugobjects.c:502 [inline] pc : debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 lr : debug_print_object lib/debugobjects.c:502 [inline] lr : debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 sp : ffff8000140cba10 x29: ffff8000140cba10 x28: 00000000002e0003 x27: 0000000000000000 x26: ffff0000caa9e270 x25: 0000000000000000 x24: ffff000111d07980 x23: ffff80000f0f30f8 x22: ffff80000d3ac000 x21: ffff80000f175000 x20: ffff80000c0ef7d0 x19: ffff000102544570 x18: 000000000000ba7e x17: 000000000000b67e x16: ffff80000dc18158 x15: ffff00011385cec0 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff00011385cec0 x11: ff808000081c4d40 x10: 0000000000000000 x9 : 0e2baa477f130f00 x8 : 0e2baa477f130f00 x7 : ffff80000816678c x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000006 x1 : 0000000100000000 x0 : 000000000000006c Call trace: debug_print_object lib/debugobjects.c:502 [inline] debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 debug_timer_assert_init kernel/time/timer.c:792 [inline] debug_assert_init kernel/time/timer.c:837 [inline] del_timer+0x34/0x1a8 kernel/time/timer.c:1257 sk_stop_timer+0x24/0xb4 net/core/sock.c:3348 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+0x2dc/0xcac kernel/exit.c:820 do_group_exit+0x98/0xcc kernel/exit.c:950 get_signal+0xabc/0xb2c kernel/signal.c:2858 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1071 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1124 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: 4154 hardirqs last enabled at (4153): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1366 [inline] hardirqs last enabled at (4153): [] finish_lock_switch+0x94/0xe8 kernel/sched/core.c:4968 hardirqs last disabled at (4154): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (4118): [] spin_unlock_bh include/linux/spinlock.h:395 [inline] softirqs last enabled at (4118): [] lock_sock_nested+0xc0/0xd8 net/core/sock.c:3454 softirqs last disabled at (4116): [] spin_lock_bh include/linux/spinlock.h:355 [inline] softirqs last disabled at (4116): [] lock_sock_nested+0x88/0xd8 net/core/sock.c:3450 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ ODEBUG: assert_init not available (active state 0) object type: timer_list hint: arch_atomic_fetch_sub_release arch/arm64/include/asm/atomic.h:51 [inline] ODEBUG: assert_init not available (active state 0) object type: timer_list hint: atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:177 [inline] ODEBUG: assert_init not available (active state 0) object type: timer_list hint: __refcount_sub_and_test include/linux/refcount.h:272 [inline] ODEBUG: assert_init not available (active state 0) object type: timer_list hint: __refcount_dec_and_test include/linux/refcount.h:315 [inline] ODEBUG: assert_init not available (active state 0) object type: timer_list hint: refcount_dec_and_test include/linux/refcount.h:333 [inline] ODEBUG: assert_init not available (active state 0) object type: timer_list hint: sock_put include/net/sock.h:1986 [inline] ODEBUG: assert_init not available (active state 0) object type: timer_list hint: nr_t2timer_expiry+0x0/0x104 net/netrom/nr_timer.c:246 WARNING: CPU: 0 PID: 4440 at lib/debugobjects.c:505 debug_print_object lib/debugobjects.c:502 [inline] WARNING: CPU: 0 PID: 4440 at lib/debugobjects.c:505 debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 Modules linked in: CPU: 0 PID: 4440 Comm: syz-executor.1 Tainted: G W 6.1.0-rc6-syzkaller-32653-g65762d97e6fa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : debug_print_object lib/debugobjects.c:502 [inline] pc : debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 lr : debug_print_object lib/debugobjects.c:502 [inline] lr : debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 sp : ffff8000140cba10 x29: ffff8000140cba10 x28: 00000000002e0003 x27: 0000000000000000 x26: ffff0000caa9e270 x25: 0000000000000000 x24: ffff000111d07980 x23: ffff80000f0f30f8 x22: ffff80000d3ac000 x21: ffff80000f175000 x20: ffff80000c0ef7d0 x19: ffff0001025445c0 x18: 0000000000000302 x17: 0000000000000000 x16: ffff80000dc18158 x15: ffff00011385cec0 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff00011385cec0 x11: ff808000081c4d40 x10: 0000000000000000 x9 : 0e2baa477f130f00 x8 : 0e2baa477f130f00 x7 : ffff80000816678c x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000006 x1 : 0000000100000000 x0 : 000000000000006c Call trace: debug_print_object lib/debugobjects.c:502 [inline] debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 debug_timer_assert_init kernel/time/timer.c:792 [inline] debug_assert_init kernel/time/timer.c:837 [inline] del_timer+0x34/0x1a8 kernel/time/timer.c:1257 sk_stop_timer+0x24/0xb4 net/core/sock.c:3348 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+0x2dc/0xcac kernel/exit.c:820 do_group_exit+0x98/0xcc kernel/exit.c:950 get_signal+0xabc/0xb2c kernel/signal.c:2858 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1071 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1124 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: 4468 hardirqs last enabled at (4467): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1366 [inline] hardirqs last enabled at (4467): [] finish_lock_switch+0x94/0xe8 kernel/sched/core.c:4968 hardirqs last disabled at (4468): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (4430): [] _stext+0x2e4/0x37c softirqs last disabled at (4157): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ ODEBUG: assert_init not available (active state 0) object type: timer_list hint: 0x0 WARNING: CPU: 1 PID: 4440 at lib/debugobjects.c:505 debug_print_object lib/debugobjects.c:502 [inline] WARNING: CPU: 1 PID: 4440 at lib/debugobjects.c:505 debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 Modules linked in: CPU: 1 PID: 4440 Comm: syz-executor.1 Tainted: G W 6.1.0-rc6-syzkaller-32653-g65762d97e6fa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : debug_print_object lib/debugobjects.c:502 [inline] pc : debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 lr : debug_print_object lib/debugobjects.c:502 [inline] lr : debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 sp : ffff8000140cba10 x29: ffff8000140cba10 x28: 00000000002e0003 x27: 0000000000000000 x26: ffff0000caa9e270 x25: 0000000000000000 x24: ffff000111d07980 x23: ffff80000f0f30f8 x22: ffff80000d3ac000 x21: ffff80000f175000 x20: ffff80000c0ef7d0 x19: ffff000102544610 x18: 0000000000000302 x17: 203a657079742074 x16: ffff80000dc18158 x15: ffff00011385cec0 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff00011385cec0 x11: ff808000081c4d40 x10: 0000000000000000 x9 : 0e2baa477f130f00 x8 : 0e2baa477f130f00 x7 : ffff80000c0b1cb4 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000054 Call trace: debug_print_object lib/debugobjects.c:502 [inline] debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 debug_timer_assert_init kernel/time/timer.c:792 [inline] debug_assert_init kernel/time/timer.c:837 [inline] del_timer+0x34/0x1a8 kernel/time/timer.c:1257 sk_stop_timer+0x24/0xb4 net/core/sock.c:3348 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+0x2dc/0xcac kernel/exit.c:820 do_group_exit+0x98/0xcc kernel/exit.c:950 get_signal+0xabc/0xb2c kernel/signal.c:2858 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1071 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1124 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: 4810 hardirqs last enabled at (4809): [] __up_console_sem+0xb0/0xfc kernel/printk/printk.c:261 hardirqs last disabled at (4810): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (4780): [] _stext+0x2e4/0x37c softirqs last disabled at (4473): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ ODEBUG: assert_init not available (active state 0) object type: timer_list hint: 0x0 WARNING: CPU: 1 PID: 4440 at lib/debugobjects.c:505 debug_print_object lib/debugobjects.c:502 [inline] WARNING: CPU: 1 PID: 4440 at lib/debugobjects.c:505 debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 Modules linked in: CPU: 1 PID: 4440 Comm: syz-executor.1 Tainted: G W 6.1.0-rc6-syzkaller-32653-g65762d97e6fa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : debug_print_object lib/debugobjects.c:502 [inline] pc : debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 lr : debug_print_object lib/debugobjects.c:502 [inline] lr : debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 sp : ffff8000140cba10 x29: ffff8000140cba10 x28: 00000000002e0003 x27: 0000000000000000 x26: ffff0000caa9e270 x25: 0000000000000000 x24: ffff000111d07980 x23: ffff80000f0f30f8 x22: ffff80000d3ac000 x21: ffff80000f175000 x20: ffff80000c0ef7d0 x19: ffff000102544660 x18: 000000000000010d x17: 0000000000000000 x16: ffff80000dc18158 x15: ffff00011385cec0 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff00011385cec0 x11: ff808000081c4d40 x10: 0000000000000000 x9 : 0e2baa477f130f00 x8 : 0e2baa477f130f00 x7 : ffff80000816678c x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000006 x1 : 0000000100000000 x0 : 0000000000000054 Call trace: debug_print_object lib/debugobjects.c:502 [inline] debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 debug_timer_assert_init kernel/time/timer.c:792 [inline] debug_assert_init kernel/time/timer.c:837 [inline] del_timer+0x34/0x1a8 kernel/time/timer.c:1257 sk_stop_timer+0x24/0xb4 net/core/sock.c:3348 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+0x2dc/0xcac kernel/exit.c:820 do_group_exit+0x98/0xcc kernel/exit.c:950 get_signal+0xabc/0xb2c kernel/signal.c:2858 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1071 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1124 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: 5472 hardirqs last enabled at (5471): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1366 [inline] hardirqs last enabled at (5471): [] finish_lock_switch+0x94/0xe8 kernel/sched/core.c:4968 hardirqs last disabled at (5472): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (5448): [] _stext+0x2e4/0x37c softirqs last disabled at (5301): [] ____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: 4440 Comm: syz-executor.1 Tainted: G W 6.1.0-rc6-syzkaller-32653-g65762d97e6fa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156 show_stack+0x2c/0x54 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:3398 [inline] skb_queue_purge+0x28/0xc0 net/core/skbuff.c:3436 nr_clear_queues net/netrom/nr_subr.c:35 [inline] nr_disconnect+0x44/0xc0 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+0x2dc/0xcac kernel/exit.c:820 do_group_exit+0x98/0xcc kernel/exit.c:950 get_signal+0xabc/0xb2c kernel/signal.c:2858 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1071 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1124 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 Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Mem abort info: ESR = 0x0000000086000005 EC = 0x21: IABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault user pgtable: 4k pages, 48-bit VAs, pgdp=000000014cf96000 [0000000000000000] pgd=0800000141ad3003, p4d=0800000141ad3003, pud=0000000000000000 Internal error: Oops: 0000000086000005 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 4440 Comm: syz-executor.1 Tainted: G W 6.1.0-rc6-syzkaller-32653-g65762d97e6fa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : 0x0 lr : nr_disconnect+0x9c/0xc0 net/netrom/nr_subr.c:275 sp : ffff8000140cbae0 x29: ffff8000140cbae0 x28: 00000000002e0003 x27: 0000000000000000 x26: ffff0000caa9e270 x25: 0000000000000000 x24: ffff000111d07980 x23: ffff80000b2414cc x22: 0000000000000000 x21: ffff000111d078c0 x20: 0000000000000000 x19: ffff000102544000 x18: 00000000000001ea x17: ffff80000c0ed83c x16: 000000000000b67e x15: 00000000000002fc x14: 0000000002d1d11f x13: 0000000000000120 x12: 0000000000000000 x11: ff8080000b96fbf4 x10: 0000000000000000 x9 : ffff80000b96fbf4 x8 : 0000000000000000 x7 : 00000000000f4240 x6 : ffff80000b25b6a4 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff00011385cec0 x1 : 0000000000000000 x0 : ffff000102544000 Call trace: 0x0 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+0x2dc/0xcac kernel/exit.c:820 do_group_exit+0x98/0xcc kernel/exit.c:950 get_signal+0xabc/0xb2c kernel/signal.c:2858 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1071 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1124 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 Code: bad PC value ---[ end trace 0000000000000000 ]---