------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 0 PID: 4406 at lib/refcount.c:25 refcount_warn_saturate+0x180/0x1c8 lib/refcount.c:25 Modules linked in: CPU: 0 PID: 4406 Comm: syz-executor.2 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #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 : ffff8000149cbcd0 x29: ffff8000149cbcd0 x28: 00000000002e0003 x27: 0000000000000000 x26: ffff0001244ea138 x25: 0000000000000000 x24: ffff0001175d17c0 x23: ffff80000b1ba318 x22: 0000000000000000 x21: ffff0001175d1700 x20: 0000000000000002 x19: ffff80000d8c8000 x18: 0000000000000332 x17: 0000000000000000 x16: ffff80000db49158 x15: ffff000119009a80 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff000119009a80 x11: ff808000081c0d5c x10: 0000000000000000 x9 : 7595cdabb6d2b500 x8 : 7595cdabb6d2b500 x7 : ffff800008161d1c 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:774 [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+0x198/0x3dc fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:353 task_work_run+0xc4/0x14c kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x174/0x1f0 arch/arm64/kernel/signal.c:1127 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:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 irq event stamp: 15220 hardirqs last enabled at (15219): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1367 [inline] hardirqs last enabled at (15219): [] finish_lock_switch+0x94/0xe8 kernel/sched/core.c:4942 hardirqs last disabled at (15220): [] el1_dbg+0x24/0x5c arch/arm64/kernel/entry-common.c:404 softirqs last enabled at (15128): [] spin_unlock_bh include/linux/spinlock.h:394 [inline] softirqs last enabled at (15128): [] release_sock+0xf4/0x108 net/core/sock.c:3419 softirqs last disabled at (15126): [] spin_lock_bh include/linux/spinlock.h:354 [inline] softirqs last disabled at (15126): [] release_sock+0x2c/0x108 net/core/sock.c:3406 ---[ 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: 1 PID: 4406 at lib/debugobjects.c:505 debug_print_object lib/debugobjects.c:502 [inline] WARNING: CPU: 1 PID: 4406 at lib/debugobjects.c:505 debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 Modules linked in: CPU: 1 PID: 4406 Comm: syz-executor.2 Tainted: G W 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #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 : ffff8000149cbc00 x29: ffff8000149cbc00 x28: 00000000002e0003 x27: 0000000000000000 x26: ffff0001244ea138 x25: 0000000000000000 x24: ffff0001175d17c0 x23: ffff80000f070d68 x22: ffff80000d30c000 x21: ffff80000f0a5000 x20: ffff80000bfff5b8 x19: ffff000118ee5560 x18: 00000000000000e7 x17: 0000000000000000 x16: ffff80000db49158 x15: ffff000119009a80 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff000119009a80 x11: ff808000081c0d5c x10: 0000000000000000 x9 : 7595cdabb6d2b500 x8 : 7595cdabb6d2b500 x7 : ffff800008161d1c 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:3294 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+0x198/0x3dc fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:353 task_work_run+0xc4/0x14c kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x174/0x1f0 arch/arm64/kernel/signal.c:1127 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:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 irq event stamp: 15298 hardirqs last enabled at (15297): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1367 [inline] hardirqs last enabled at (15297): [] finish_lock_switch+0x94/0xe8 kernel/sched/core.c:4942 hardirqs last disabled at (15298): [] el1_dbg+0x24/0x5c arch/arm64/kernel/entry-common.c:404 softirqs last enabled at (15266): [] spin_unlock_bh include/linux/spinlock.h:394 [inline] softirqs last enabled at (15266): [] lock_sock_nested+0xc0/0xd8 net/core/sock.c:3400 softirqs last disabled at (15264): [] spin_lock_bh include/linux/spinlock.h:354 [inline] softirqs last disabled at (15264): [] lock_sock_nested+0x88/0xd8 net/core/sock.c:3396 ---[ 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:1961 [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: 1 PID: 4406 at lib/debugobjects.c:505 debug_print_object lib/debugobjects.c:502 [inline] WARNING: CPU: 1 PID: 4406 at lib/debugobjects.c:505 debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 Modules linked in: CPU: 1 PID: 4406 Comm: syz-executor.2 Tainted: G W 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #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 : ffff8000149cbc00 x29: ffff8000149cbc00 x28: 00000000002e0003 x27: 0000000000000000 x26: ffff0001244ea138 x25: 0000000000000000 x24: ffff0001175d17c0 x23: ffff80000f070d68 x22: ffff80000d30c000 x21: ffff80000f0a5000 x20: ffff80000bfff5b8 x19: ffff000118ee55b0 x18: 00000000000000ae x17: 0000000000000000 x16: ffff80000db49158 x15: ffff000119009a80 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff000119009a80 x11: ff808000081c0d5c x10: 0000000000000000 x9 : 7595cdabb6d2b500 x8 : 7595cdabb6d2b500 x7 : ffff800008161d1c 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:3294 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+0x198/0x3dc fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:353 task_work_run+0xc4/0x14c kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x174/0x1f0 arch/arm64/kernel/signal.c:1127 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:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 irq event stamp: 15480 hardirqs last enabled at (15479): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1367 [inline] hardirqs last enabled at (15479): [] finish_lock_switch+0x94/0xe8 kernel/sched/core.c:4942 hardirqs last disabled at (15480): [] el1_dbg+0x24/0x5c arch/arm64/kernel/entry-common.c:404 softirqs last enabled at (15458): [] _stext+0x2e4/0x37c softirqs last disabled at (15407): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:79 ---[ 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:1961 [inline] ODEBUG: assert_init not available (active state 0) object type: timer_list hint: nr_t4timer_expiry+0x0/0xe0 net/netrom/nr_timer.c:162 WARNING: CPU: 1 PID: 4406 at lib/debugobjects.c:505 debug_print_object lib/debugobjects.c:502 [inline] WARNING: CPU: 1 PID: 4406 at lib/debugobjects.c:505 debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 Modules linked in: CPU: 1 PID: 4406 Comm: syz-executor.2 Tainted: G W 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #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 : ffff8000149cbc00 x29: ffff8000149cbc00 x28: 00000000002e0003 x27: 0000000000000000 x26: ffff0001244ea138 x25: 0000000000000000 x24: ffff0001175d17c0 x23: ffff80000f070d68 x22: ffff80000d30c000 x21: ffff80000f0a5000 x20: ffff80000bfff5b8 x19: ffff000118ee5600 x18: 00000000000002aa x17: ffff80000bffd6bc x16: ffff80000db49158 x15: ffff000119009a80 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff000119009a80 x11: ff808000081c0d5c x10: 0000000000000000 x9 : 7595cdabb6d2b500 x8 : 7595cdabb6d2b500 x7 : ffff800008161d1c x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff0001fefddcd0 x1 : 0000000100000000 x0 : 000000000000006b 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:3294 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+0x198/0x3dc fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:353 task_work_run+0xc4/0x14c kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x174/0x1f0 arch/arm64/kernel/signal.c:1127 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:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 irq event stamp: 15814 hardirqs last enabled at (15813): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1367 [inline] hardirqs last enabled at (15813): [] finish_lock_switch+0x94/0xe8 kernel/sched/core.c:4942 hardirqs last disabled at (15814): [] el1_dbg+0x24/0x5c arch/arm64/kernel/entry-common.c:404 softirqs last enabled at (15806): [] _stext+0x2e4/0x37c softirqs last disabled at (15671): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:79 ---[ 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:1961 [inline] ODEBUG: assert_init not available (active state 0) object type: timer_list hint: nr_idletimer_expiry+0x0/0x194 net/netrom/nr_timer.c:173 WARNING: CPU: 1 PID: 4406 at lib/debugobjects.c:505 debug_print_object lib/debugobjects.c:502 [inline] WARNING: CPU: 1 PID: 4406 at lib/debugobjects.c:505 debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 Modules linked in: CPU: 1 PID: 4406 Comm: syz-executor.2 Tainted: G W 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #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 : ffff8000149cbc00 x29: ffff8000149cbc00 x28: 00000000002e0003 x27: 0000000000000000 x26: ffff0001244ea138 x25: 0000000000000000 x24: ffff0001175d17c0 x23: ffff80000f070d68 x22: ffff80000d30c000 x21: ffff80000f0a5000 x20: ffff80000bfff5b8 x19: ffff000118ee5650 x18: 0000000000000325 x17: ffff80000bffd6bc x16: ffff80000db49158 x15: ffff000119009a80 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff000119009a80 x11: ff808000081c0d5c x10: 0000000000000000 x9 : 7595cdabb6d2b500 x8 : 7595cdabb6d2b500 x7 : ffff800008161d1c x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff0001fefddcd0 x1 : 0000000100000000 x0 : 000000000000006e 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:3294 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+0x198/0x3dc fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:353 task_work_run+0xc4/0x14c kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x174/0x1f0 arch/arm64/kernel/signal.c:1127 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:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 irq event stamp: 15970 hardirqs last enabled at (15969): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1367 [inline] hardirqs last enabled at (15969): [] finish_lock_switch+0x94/0xe8 kernel/sched/core.c:4942 hardirqs last disabled at (15970): [] el1_dbg+0x24/0x5c arch/arm64/kernel/entry-common.c:404 softirqs last enabled at (15962): [] _stext+0x2e4/0x37c softirqs last disabled at (15925): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:79 ---[ 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:1961 [inline] ODEBUG: assert_init not available (active state 0) object type: timer_list hint: nr_heartbeat_expiry+0x0/0x1f4 net/netrom/nr_timer.c:202 WARNING: CPU: 1 PID: 4406 at lib/debugobjects.c:505 debug_print_object lib/debugobjects.c:502 [inline] WARNING: CPU: 1 PID: 4406 at lib/debugobjects.c:505 debug_object_assert_init+0x144/0x198 lib/debugobjects.c:892 Modules linked in: CPU: 1 PID: 4406 Comm: syz-executor.2 Tainted: G W 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #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 : ffff8000149cbbf0 x29: ffff8000149cbbf0 x28: 00000000002e0003 x27: 0000000000000000 x26: ffff0001244ea138 x25: 0000000000000000 x24: ffff0001175d17c0 x23: ffff80000f070d68 x22: ffff80000d30c000 x21: ffff80000f0a5000 x20: ffff80000bfff5b8 x19: ffff000118ee52f8 x18: 0000000000000325 x17: 203a657079742074 x16: ffff80000db49158 x15: ffff000119009a80 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff000119009a80 x11: ff808000081c0d5c x10: 0000000000000000 x9 : 7595cdabb6d2b500 x8 : 7595cdabb6d2b500 x7 : ffff80000819545c x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000000 x0 : 000000000000006e 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:3294 nr_stop_heartbeat+0x24/0x34 net/netrom/nr_timer.c:104 nr_destroy_socket+0xb4/0x298 net/netrom/af_netrom.c:263 nr_release+0x180/0x274 net/netrom/af_netrom.c:530 __sock_release net/socket.c:650 [inline] sock_close+0x50/0xf0 net/socket.c:1365 __fput+0x198/0x3dc fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:353 task_work_run+0xc4/0x14c kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x174/0x1f0 arch/arm64/kernel/signal.c:1127 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:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 irq event stamp: 16078 hardirqs last enabled at (16077): [] __up_console_sem+0xb0/0xfc kernel/printk/printk.c:264 hardirqs last disabled at (16078): [] el1_dbg+0x24/0x5c arch/arm64/kernel/entry-common.c:404 softirqs last enabled at (16054): [] spin_unlock_bh include/linux/spinlock.h:394 [inline] softirqs last enabled at (16054): [] nr_remove_socket net/netrom/af_netrom.c:95 [inline] softirqs last enabled at (16054): [] nr_destroy_socket+0xac/0x298 net/netrom/af_netrom.c:261 softirqs last disabled at (16052): [] spin_lock_bh include/linux/spinlock.h:354 [inline] softirqs last disabled at (16052): [] nr_remove_socket net/netrom/af_netrom.c:93 [inline] softirqs last disabled at (16052): [] nr_destroy_socket+0x28/0x298 net/netrom/af_netrom.c:261 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 4406 at lib/refcount.c:28 refcount_warn_saturate+0x1a0/0x1c8 lib/refcount.c:28 Modules linked in: CPU: 1 PID: 4406 Comm: syz-executor.2 Tainted: G W 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #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+0x1a0/0x1c8 lib/refcount.c:28 lr : refcount_warn_saturate+0x1a0/0x1c8 lib/refcount.c:28 sp : ffff8000149cbcd0 x29: ffff8000149cbcd0 x28: 00000000002e0003 x27: 0000000000000000 x26: ffff0001244ea138 x25: 0000000000000000 x24: ffff0001175d17c0 x23: ffff80000b1ba318 x22: 0000000000000000 x21: 00000000c0000000 x20: 0000000000000003 x19: ffff80000d8c8000 x18: 0000000000000325 x17: 203a657079742074 x16: ffff80000db49158 x15: ffff000119009a80 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff000119009a80 x11: ff808000081c0d5c x10: 0000000000000000 x9 : 7595cdabb6d2b500 x8 : 7595cdabb6d2b500 x7 : ffff80000819545c x6 : 0000000000000000 x5 : 0000000000000080 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:1961 [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+0x198/0x3dc fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:353 task_work_run+0xc4/0x14c kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x174/0x1f0 arch/arm64/kernel/signal.c:1127 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:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 irq event stamp: 16238 hardirqs last enabled at (16237): [] __up_console_sem+0xb0/0xfc kernel/printk/printk.c:264 hardirqs last disabled at (16238): [] el1_dbg+0x24/0x5c arch/arm64/kernel/entry-common.c:404 softirqs last enabled at (16216): [] spin_unlock_bh include/linux/spinlock.h:394 [inline] softirqs last enabled at (16216): [] release_sock+0xf4/0x108 net/core/sock.c:3419 softirqs last disabled at (16214): [] spin_lock_bh include/linux/spinlock.h:354 [inline] softirqs last disabled at (16214): [] release_sock+0x2c/0x108 net/core/sock.c:3406 ---[ end trace 0000000000000000 ]---