------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 0 PID: 4181 at lib/refcount.c:25 refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25
Modules linked in:
CPU: 0 PID: 4181 Comm: udevd 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 : ffff800008007800
x29: ffff800008007800 x28: ffff0000d60d6800 x27: ffff0000cf4e5800
x26: 1fffe0001b3466d1 x25: dfff800000000000 x24: 1fffe00019e9cb01
x23: ffff0000cbf9a400 x22: ffff0000c14c8154 x21: ffff0000d5518080
x20: ffff0000c14c8154 x19: ffff80001659e000 x18: 0000000000000102
x17: 0000000000000000 x16: ffff8000083008fc x15: 00000000ffffffff
x14: 0000000000ff0100 x13: 0000000000000001 x12: 0000000000ff0100
x11: 0000000000000101 x10: 0000000000000000 x9 : 1e8d61352a784e00
x8 : 1e8d61352a784e00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff8000080070f8 x4 : ffff80001423f280 x3 : ffff800008300a0c
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 arch/arm64/include/asm/irqflags.h:35 [inline]
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
 _raw_spin_unlock_irq+0xa0/0x128 kernel/locking/spinlock.c:202
 spin_unlock_irq include/linux/spinlock.h:413 [inline]
 delete_from_page_cache+0x10c/0x178 mm/filemap.c:267
 truncate_inode_page+0x98/0xc8 mm/truncate.c:219
 shmem_undo_range+0x3c8/0x1234 mm/shmem.c:960
 shmem_truncate_range mm/shmem.c:1063 [inline]
 shmem_evict_inode+0x1c0/0x838 mm/shmem.c:1145
 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
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 do_notify_resume+0x24b4/0x3128 arch/arm64/kernel/signal.c:949
 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: 97355
hardirqs last  enabled at (97354): [<ffff8000082f7764>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257
hardirqs last disabled at (97355): [<ffff8000111a5098>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last  enabled at (94150): [<ffff80000819d1e8>] softirq_handle_end kernel/softirq.c:419 [inline]
softirqs last  enabled at (94150): [<ffff80000819d1e8>] handle_softirqs+0xa4c/0xbf0 kernel/softirq.c:604
softirqs last disabled at (95487): [<ffff80000819d7ec>] __do_softirq kernel/softirq.c:610 [inline]
softirqs last disabled at (95487): [<ffff80000819d7ec>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (95487): [<ffff80000819d7ec>] invoke_softirq kernel/softirq.c:457 [inline]
softirqs last disabled at (95487): [<ffff80000819d7ec>] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659
---[ end trace 7a4b6259df738f9f ]---
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 4181 at lib/refcount.c:28 refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28
Modules linked in:
CPU: 0 PID: 4181 Comm: udevd 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 : ffff800008007800
x29: ffff800008007800 x28: ffff0000d60d6800 x27: 0000000000000000
x26: 1fffe0001b3466d1 x25: dfff800000000000 x24: 1fffe00019e9cb01
x23: ffff0000da3f5538 x22: ffff0000c14c8000 x21: ffff0000d5518080
x20: ffff0000c14c8154 x19: ffff80001659e000 x18: 0000000000000102
x17: 0000000000000000 x16: ffff8000083008fc x15: 00000000ffffffff
x14: 0000000000ff0100 x13: 0000000000000001 x12: 0000000000ff0100
x11: 0000000000000101 x10: 0000000000000000 x9 : 1e8d61352a784e00
x8 : 1e8d61352a784e00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff8000080070f8 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 arch/arm64/include/asm/irqflags.h:35 [inline]
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
 _raw_spin_unlock_irq+0xa0/0x128 kernel/locking/spinlock.c:202
 spin_unlock_irq include/linux/spinlock.h:413 [inline]
 delete_from_page_cache+0x10c/0x178 mm/filemap.c:267
 truncate_inode_page+0x98/0xc8 mm/truncate.c:219
 shmem_undo_range+0x3c8/0x1234 mm/shmem.c:960
 shmem_truncate_range mm/shmem.c:1063 [inline]
 shmem_evict_inode+0x1c0/0x838 mm/shmem.c:1145
 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
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 do_notify_resume+0x24b4/0x3128 arch/arm64/kernel/signal.c:949
 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: 97383
hardirqs last  enabled at (97382): [<ffff8000082f7764>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257
hardirqs last disabled at (97383): [<ffff8000111a5098>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last  enabled at (94150): [<ffff80000819d1e8>] softirq_handle_end kernel/softirq.c:419 [inline]
softirqs last  enabled at (94150): [<ffff80000819d1e8>] handle_softirqs+0xa4c/0xbf0 kernel/softirq.c:604
softirqs last disabled at (95487): [<ffff80000819d7ec>] __do_softirq kernel/softirq.c:610 [inline]
softirqs last disabled at (95487): [<ffff80000819d7ec>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (95487): [<ffff80000819d7ec>] invoke_softirq kernel/softirq.c:457 [inline]
softirqs last disabled at (95487): [<ffff80000819d7ec>] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659
---[ end trace 7a4b6259df738fa0 ]---
------------[ cut here ]------------
refcount_t: saturated; leaking memory.
WARNING: CPU: 0 PID: 4179 at lib/refcount.c:22 refcount_warn_saturate+0x1b4/0x1f8 lib/refcount.c:22
Modules linked in:
CPU: 0 PID: 4179 Comm: udevd 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 : ffff800008007800
x29: ffff800008007800 x28: ffff0000d6385800 x27: ffff0000cf4e5800
x26: 1fffe0001b2236d1 x25: dfff800000000000 x24: 1fffe00019e9cb01
x23: ffff0000d0500000 x22: ffff0000c14c8154 x21: 000000007ffffffe
x20: ffff0000c14c8154 x19: ffff80001659e000 x18: 0000000000000101
x17: 0000000000000000 x16: ffff8000111a97c4 x15: 00000000ffffffff
x14: 0000000000ff0100 x13: 0000000000000001 x12: 0000000000ff0100
x11: 0000000000000100 x10: 0000000000000000 x9 : 1239626aaf087a00
x8 : 1239626aaf087a00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff8000080070f8 x4 : ffff80001423f280 x3 : ffff800008503958
x2 : 0000000000000001 x1 : 0000000000000100 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
 xa_entry include/linux/xarray.h:1182 [inline]
 xas_find+0x45c/0x8f8 lib/xarray.c:1266
 find_get_entry+0x70/0x254 mm/filemap.c:1978
 find_lock_entries+0x4ec/0x828 mm/filemap.c:2092
 shmem_undo_range+0x1dc/0x1234 mm/shmem.c:943
 shmem_truncate_range mm/shmem.c:1063 [inline]
 shmem_evict_inode+0x1c0/0x838 mm/shmem.c:1145
 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
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 do_notify_resume+0x24b4/0x3128 arch/arm64/kernel/signal.c:949
 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: 97635
hardirqs last  enabled at (97634): [<ffff8000082f7764>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257
hardirqs last disabled at (97635): [<ffff8000111a5098>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last  enabled at (93808): [<ffff80000819d1e8>] softirq_handle_end kernel/softirq.c:419 [inline]
softirqs last  enabled at (93808): [<ffff80000819d1e8>] handle_softirqs+0xa4c/0xbf0 kernel/softirq.c:604
softirqs last disabled at (97605): [<ffff80000819d7ec>] __do_softirq kernel/softirq.c:610 [inline]
softirqs last disabled at (97605): [<ffff80000819d7ec>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (97605): [<ffff80000819d7ec>] invoke_softirq kernel/softirq.c:457 [inline]
softirqs last disabled at (97605): [<ffff80000819d7ec>] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659
---[ end trace 7a4b6259df738fa2 ]---