------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 1 PID: 0 at lib/refcount.c:25 refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 Modules linked in: CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.15.185-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 : ffff800008017800 x29: ffff800008017800 x28: ffff0000da4c8400 x27: ffff0000c184b400 x26: 1fffe0001814d001 x25: dfff800000000000 x24: 1fffe00018309681 x23: ffff0000e5b86400 x22: ffff0000f0bc0154 x21: ffff0000cd2be080 x20: ffff0000f0bc0154 x19: ffff80001659e000 x18: 0000000000000102 x17: 0000000000000000 x16: ffff8000111a97c4 x15: 00000000ffffffff x14: 0000000000ff0100 x13: 0000000000000001 x12: 0000000000ff0100 x11: 0000000000000101 x10: 0000000000000000 x9 : 83050a1cb1292a00 x8 : 83050a1cb1292a00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff8000080170f8 x4 : ffff80001423f280 x3 : ffff800008503958 x2 : 0000000000000001 x1 : 0000000000000101 x0 : 000000000000002a 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:252 [inline] tipc_aead_encrypt net/tipc/crypto.c:832 [inline] tipc_crypto_xmit+0x1634/0x2220 net/tipc/crypto.c:1772 tipc_bearer_xmit_skb+0x1f0/0x384 net/tipc/bearer.c:574 tipc_disc_timeout+0x4c8/0x608 net/tipc/discover.c:338 call_timer_fn+0x19c/0x858 kernel/time/timer.c:1451 expire_timers kernel/time/timer.c:1496 [inline] __run_timers+0x46c/0x6c4 kernel/time/timer.c:1767 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1780 handle_softirqs+0x344/0xbf0 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] invoke_softirq kernel/softirq.c:457 [inline] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 irq_exit+0x14/0x88 kernel/softirq.c:683 handle_domain_irq+0x14c/0x1fc kernel/irq/irqdesc.c:711 gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:765 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:899 do_interrupt_handler+0x6c/0x88 arch/arm64/kernel/entry-common.c:267 el1_interrupt+0x30/0x58 arch/arm64/kernel/entry-common.c:454 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:470 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:522 arch_local_irq_enable+0xc/0x18 arch/arm64/include/asm/irqflags.h:35 default_idle_call+0xcc/0x418 kernel/sched/idle.c:112 cpuidle_idle_call kernel/sched/idle.c:194 [inline] do_idle+0x1c8/0x480 kernel/sched/idle.c:306 cpu_startup_entry+0x24/0x28 kernel/sched/idle.c:403 secondary_start_kernel+0x23c/0x294 arch/arm64/kernel/smp.c:265 __secondary_switched+0x94/0x98 arch/arm64/kernel/head.S:661 irq event stamp: 157375 hardirqs last enabled at (157374): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257 hardirqs last disabled at (157375): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (157316): [] softirq_handle_end kernel/softirq.c:419 [inline] softirqs last enabled at (157316): [] handle_softirqs+0xa4c/0xbf0 kernel/softirq.c:604 softirqs last disabled at (157329): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (157329): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (157329): [] invoke_softirq kernel/softirq.c:457 [inline] softirqs last disabled at (157329): [] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 ---[ end trace 18c374a5d9388e86 ]--- ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 0 at lib/refcount.c:28 refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 Modules linked in: CPU: 1 PID: 0 Comm: swapper/1 Tainted: G W 5.15.185-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 : ffff800008017800 x29: ffff800008017800 x28: ffff0000da4c8400 x27: 0000000000000000 x26: 1fffe0001814d001 x25: dfff800000000000 x24: 1fffe00018309681 x23: ffff0000d71883b8 x22: ffff0000f0bc0000 x21: ffff0000cd2be080 x20: ffff0000f0bc0154 x19: ffff80001659e000 x18: 0000000000000102 x17: 0000000000000000 x16: ffff8000083008fc x15: 00000000ffffffff x14: 0000000000ff0100 x13: 0000000000000001 x12: 0000000000ff0100 x11: 0000000000000101 x10: 0000000000000000 x9 : 83050a1cb1292a00 x8 : 83050a1cb1292a00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff8000080170f8 x4 : ffff80001423f280 x3 : ffff800008300a0c x2 : 0000000000000001 x1 : 0000000000000101 x0 : 0000000000000026 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:270 [inline] tipc_aead_encrypt net/tipc/crypto.c:840 [inline] tipc_crypto_xmit+0x177c/0x2220 net/tipc/crypto.c:1772 tipc_bearer_xmit_skb+0x1f0/0x384 net/tipc/bearer.c:574 tipc_disc_timeout+0x4c8/0x608 net/tipc/discover.c:338 call_timer_fn+0x19c/0x858 kernel/time/timer.c:1451 expire_timers kernel/time/timer.c:1496 [inline] __run_timers+0x46c/0x6c4 kernel/time/timer.c:1767 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1780 handle_softirqs+0x344/0xbf0 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] invoke_softirq kernel/softirq.c:457 [inline] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 irq_exit+0x14/0x88 kernel/softirq.c:683 handle_domain_irq+0x14c/0x1fc kernel/irq/irqdesc.c:711 gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:765 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:899 do_interrupt_handler+0x6c/0x88 arch/arm64/kernel/entry-common.c:267 el1_interrupt+0x30/0x58 arch/arm64/kernel/entry-common.c:454 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:470 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:522 arch_local_irq_enable+0xc/0x18 arch/arm64/include/asm/irqflags.h:35 default_idle_call+0xcc/0x418 kernel/sched/idle.c:112 cpuidle_idle_call kernel/sched/idle.c:194 [inline] do_idle+0x1c8/0x480 kernel/sched/idle.c:306 cpu_startup_entry+0x24/0x28 kernel/sched/idle.c:403 secondary_start_kernel+0x23c/0x294 arch/arm64/kernel/smp.c:265 __secondary_switched+0x94/0x98 arch/arm64/kernel/head.S:661 irq event stamp: 157401 hardirqs last enabled at (157400): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257 hardirqs last disabled at (157401): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (157316): [] softirq_handle_end kernel/softirq.c:419 [inline] softirqs last enabled at (157316): [] handle_softirqs+0xa4c/0xbf0 kernel/softirq.c:604 softirqs last disabled at (157329): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (157329): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (157329): [] invoke_softirq kernel/softirq.c:457 [inline] softirqs last disabled at (157329): [] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 ---[ end trace 18c374a5d9388e87 ]--- ------------[ cut here ]------------ refcount_t: saturated; leaking memory. WARNING: CPU: 1 PID: 8593 at lib/refcount.c:22 refcount_warn_saturate+0x1b4/0x1f8 lib/refcount.c:22 Modules linked in: CPU: 1 PID: 8593 Comm: syz.3.1000 Tainted: G W 5.15.185-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 : ffff800008017800 x29: ffff800008017800 x28: ffff0000c0ba7400 x27: ffff0000c184b400 x26: 1fffe00018da66d1 x25: dfff800000000000 x24: 1fffe00018309681 x23: ffff0000e5b86400 x22: ffff0000f0bc0154 x21: 000000007ffffffe x20: ffff0000f0bc0154 x19: ffff80001659e000 x18: 0000000000000101 x17: 0000000000000000 x16: ffff8000111a97c4 x15: 00000000ffffffff x14: 0000000000ff0100 x13: 0000000000000001 x12: 0000000000ff0100 x11: 0000000000000100 x10: 0000000000000000 x9 : 7f4f16c277da9400 x8 : 7f4f16c277da9400 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff8000080170f8 x4 : ffff80001423f280 x3 : ffff800008503958 x2 : 0000000000000001 x1 : 0000000100000100 x0 : 0000000000000026 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:252 [inline] tipc_aead_encrypt net/tipc/crypto.c:832 [inline] tipc_crypto_xmit+0x1634/0x2220 net/tipc/crypto.c:1772 tipc_bearer_xmit_skb+0x1f0/0x384 net/tipc/bearer.c:574 tipc_disc_timeout+0x4c8/0x608 net/tipc/discover.c:338 call_timer_fn+0x19c/0x858 kernel/time/timer.c:1451 expire_timers kernel/time/timer.c:1496 [inline] __run_timers+0x46c/0x6c4 kernel/time/timer.c:1767 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1780 handle_softirqs+0x344/0xbf0 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] invoke_softirq kernel/softirq.c:457 [inline] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 irq_exit+0x14/0x88 kernel/softirq.c:683 handle_domain_irq+0x14c/0x1fc kernel/irq/irqdesc.c:711 gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:765 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:899 do_interrupt_handler+0x6c/0x88 arch/arm64/kernel/entry-common.c:267 el1_interrupt+0x30/0x58 arch/arm64/kernel/entry-common.c:454 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:470 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:522 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline] lock_release+0x4a0/0x8e8 kernel/locking/lockdep.c:5646 rcu_lock_release+0x24/0x30 include/linux/rcupdate.h:317 rcu_read_unlock include/linux/rcupdate.h:772 [inline] percpu_ref_put_many include/linux/percpu-refcount.h:324 [inline] percpu_ref_put+0x150/0x234 include/linux/percpu-refcount.h:338 css_put include/linux/cgroup.h:405 [inline] uncharge_page+0x39c/0x500 mm/memcontrol.c:6968 __mem_cgroup_uncharge_list+0x7c/0xd4 mm/memcontrol.c:7004 mem_cgroup_uncharge_list include/linux/memcontrol.h:720 [inline] release_pages+0x13c0/0x16e0 mm/swap.c:962 __pagevec_release+0x84/0xf8 mm/swap.c:983 pagevec_release include/linux/pagevec.h:81 [inline] truncate_inode_pages_range+0x29c/0x9b8 mm/truncate.c:329 truncate_inode_pages mm/truncate.c:425 [inline] truncate_inode_pages_final+0x90/0xcc mm/truncate.c:464 ext4_evict_inode+0x278/0x11dc fs/ext4/inode.c:224 evict+0x3c8/0x810 fs/inode.c:647 iput_final fs/inode.c:1769 [inline] iput+0x6c4/0x77c fs/inode.c:1795 dentry_unlink_inode+0x360/0x438 fs/dcache.c:380 __dentry_kill+0x320/0x598 fs/dcache.c:586 dentry_kill+0xc8/0x248 fs/dcache.c:-1 dput+0x23c/0x458 fs/dcache.c:893 __fput+0x494/0x7f8 fs/file_table.c:319 ____fput+0x20/0x30 fs/file_table.c:339 task_work_run+0x12c/0x1e0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x67c/0x1f58 kernel/exit.c:874 do_group_exit+0x100/0x268 kernel/exit.c:996 get_signal+0x73c/0x1340 kernel/signal.c:2900 do_signal arch/arm64/kernel/signal.c:893 [inline] do_notify_resume+0x35c/0x3128 arch/arm64/kernel/signal.c:946 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline] el0_svc+0xf0/0x1e0 arch/arm64/kernel/entry-common.c:609 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 irq event stamp: 268157 hardirqs last enabled at (268156): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257 hardirqs last disabled at (268157): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (266710): [] softirq_handle_end kernel/softirq.c:419 [inline] softirqs last enabled at (266710): [] handle_softirqs+0xa4c/0xbf0 kernel/softirq.c:604 softirqs last disabled at (268133): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (268133): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (268133): [] invoke_softirq kernel/softirq.c:457 [inline] softirqs last disabled at (268133): [] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 ---[ end trace 18c374a5d9388e89 ]---