------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 1 PID: 21 at lib/refcount.c:25 refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 Modules linked in: CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 6.1.141-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 lr : refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 sp : ffff80001c8e7680 x29: ffff80001c8e7680 x28: ffff0000d2fa6800 x27: ffff0000d2ea3208 x26: ffff0000cd071770 x25: dfff800000000000 x24: 1fffe0001a5d4641 x23: ffff0000f466e400 x22: ffff0000d20639d4 x21: ffff0000defb1880 x20: ffff0000d20639d4 x19: ffff800017a32000 x18: ffff800011a7bce0 x17: 0000000000000000 x16: ffff8000082d1c00 x15: 0000000000000000 x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000ff0100 x11: ff0080000819149c x10: 0000000000000000 x9 : 7641be936690ee00 x8 : 7641be936690ee00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001c8e7118 x4 : ffff800015154700 x3 : ffff8000083115f4 x2 : 0000000000000001 x1 : 0000000000000100 x0 : 0000000000000000 Call trace: refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 __refcount_add include/linux/refcount.h:-1 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] get_net include/net/net_namespace.h:257 [inline] tipc_aead_encrypt net/tipc/crypto.c:821 [inline] tipc_crypto_xmit+0x1518/0x2014 net/tipc/crypto.c:1761 tipc_bearer_xmit_skb+0x1f0/0x384 net/tipc/bearer.c:574 tipc_disc_timeout+0x4c8/0x608 net/tipc/discover.c:338 call_timer_fn+0x1b8/0x964 kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1549 [inline] __run_timers+0x460/0x6bc kernel/time/timer.c:1820 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1833 handle_softirqs+0x318/0xc6c kernel/softirq.c:596 run_ksoftirqd+0x7c/0x2a0 kernel/softirq.c:963 smpboot_thread_fn+0x4b0/0x964 kernel/smpboot.c:164 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 irq event stamp: 1180729 hardirqs last enabled at (1180728): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:261 hardirqs last disabled at (1180729): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (1180676): [] softirq_handle_end kernel/softirq.c:439 [inline] softirqs last enabled at (1180676): [] handle_softirqs+0xaf8/0xc6c kernel/softirq.c:624 softirqs last disabled at (1180681): [] run_ksoftirqd+0x7c/0x2a0 kernel/softirq.c:963 ---[ end trace 0000000000000000 ]--- vkms_vblank_simulate: vblank timer overrun ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 21 at lib/refcount.c:28 refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 Modules linked in: CPU: 1 PID: 21 Comm: ksoftirqd/1 Tainted: G W 6.1.141-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 lr : refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 sp : ffff80001c8e7680 x29: ffff80001c8e7680 x28: ffff0000d2fa6800 x27: 0000000000000000 x26: ffff0000cd071770 x25: dfff800000000000 x24: 1fffe00019a0e2f8 x23: 1fffe0001814a379 x22: ffff0000d2ea3200 x21: 00000000c0000000 x20: ffff0000d20639d4 x19: ffff800017a32000 x18: ffff800011a7bce0 x17: 0000000000000000 x16: ffff8000082d1c00 x15: 0000000000000000 x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000ff0100 x11: ff0080000819149c x10: 0000000000000000 x9 : 7641be936690ee00 x8 : 7641be936690ee00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001c8e7118 x4 : ffff800015154700 x3 : ffff8000083115f4 x2 : 0000000000000001 x1 : 0000000000000100 x0 : 0000000000000000 Call trace: refcount_warn_saturate+0x154/0x1f8 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] put_net include/net/net_namespace.h:276 [inline] tipc_aead_encrypt net/tipc/crypto.c:829 [inline] tipc_crypto_xmit+0x1664/0x2014 net/tipc/crypto.c:1761 tipc_bearer_xmit_skb+0x1f0/0x384 net/tipc/bearer.c:574 tipc_disc_timeout+0x4c8/0x608 net/tipc/discover.c:338 call_timer_fn+0x1b8/0x964 kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1549 [inline] __run_timers+0x460/0x6bc kernel/time/timer.c:1820 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1833 handle_softirqs+0x318/0xc6c kernel/softirq.c:596 run_ksoftirqd+0x7c/0x2a0 kernel/softirq.c:963 smpboot_thread_fn+0x4b0/0x964 kernel/smpboot.c:164 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 irq event stamp: 1180761 hardirqs last enabled at (1180760): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:261 hardirqs last disabled at (1180761): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (1180676): [] softirq_handle_end kernel/softirq.c:439 [inline] softirqs last enabled at (1180676): [] handle_softirqs+0xaf8/0xc6c kernel/softirq.c:624 softirqs last disabled at (1180681): [] run_ksoftirqd+0x7c/0x2a0 kernel/softirq.c:963 ---[ end trace 0000000000000000 ]--- vkms_vblank_simulate: vblank timer overrun ------------[ cut here ]------------ refcount_t: saturated; leaking memory. WARNING: CPU: 1 PID: 21 at lib/refcount.c:22 refcount_warn_saturate+0x1b4/0x1f8 lib/refcount.c:22 Modules linked in: CPU: 1 PID: 21 Comm: ksoftirqd/1 Tainted: G W 6.1.141-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : refcount_warn_saturate+0x1b4/0x1f8 lib/refcount.c:22 lr : refcount_warn_saturate+0x1b4/0x1f8 lib/refcount.c:22 sp : ffff80001c8e7680 x29: ffff80001c8e7680 x28: ffff0000d2fa6000 x27: ffff0000d2ea3208 x26: ffff0000cd0714f0 x25: dfff800000000000 x24: 1fffe0001a5d4641 x23: ffff0000d2894400 x22: ffff0000d20639d4 x21: 000000007ffffffe x20: ffff0000d20639d4 x19: ffff800017a32000 x18: ffff800011a7bce0 x17: 0000000000000000 x16: ffff8000082d1c00 x15: 0000000000000000 x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000ff0100 x11: ff0080000819149c x10: 0000000000000000 x9 : 7641be936690ee00 x8 : 7641be936690ee00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001c8e7118 x4 : ffff800015154700 x3 : ffff8000083115f4 x2 : 0000000000000001 x1 : 0000000000000100 x0 : 0000000000000000 Call trace: refcount_warn_saturate+0x1b4/0x1f8 lib/refcount.c:22 __refcount_add include/linux/refcount.h:-1 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] get_net include/net/net_namespace.h:257 [inline] tipc_aead_encrypt net/tipc/crypto.c:821 [inline] tipc_crypto_xmit+0x1518/0x2014 net/tipc/crypto.c:1761 tipc_bearer_xmit_skb+0x1f0/0x384 net/tipc/bearer.c:574 tipc_disc_timeout+0x4c8/0x608 net/tipc/discover.c:338 call_timer_fn+0x1b8/0x964 kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1549 [inline] __run_timers+0x460/0x6bc kernel/time/timer.c:1820 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1833 handle_softirqs+0x318/0xc6c kernel/softirq.c:596 run_ksoftirqd+0x7c/0x2a0 kernel/softirq.c:963 smpboot_thread_fn+0x4b0/0x964 kernel/smpboot.c:164 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 irq event stamp: 1180835 hardirqs last enabled at (1180834): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:261 hardirqs last disabled at (1180835): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (1180676): [] softirq_handle_end kernel/softirq.c:439 [inline] softirqs last enabled at (1180676): [] handle_softirqs+0xaf8/0xc6c kernel/softirq.c:624 softirqs last disabled at (1180681): [] run_ksoftirqd+0x7c/0x2a0 kernel/softirq.c:963 ---[ end trace 0000000000000000 ]--- vkms_vblank_simulate: vblank timer overrun