FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 1 ====================================================== WARNING: possible circular locking dependency detected 6.17.0-rc1-syzkaller-ge4414b01c1cd #0 Not tainted ------------------------------------------------------ syz.0.134/6388 is trying to acquire lock: ffffffff8e12e120 (console_owner){-.-.}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:336 [inline] ffffffff8e12e120 (console_owner){-.-.}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:319 [inline] ffffffff8e12e120 (console_owner){-.-.}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:288 [inline] ffffffff8e12e120 (console_owner){-.-.}-{0:0}, at: console_flush_all+0x13a/0xc40 kernel/printk/printk.c:3203 but task is already holding lock: ffff8880b8639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:636 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&rq->__lock){-.-.}-{2:2}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 _raw_spin_lock_nested+0x32/0x50 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:636 raw_spin_rq_lock kernel/sched/sched.h:1519 [inline] task_rq_lock+0xbc/0x470 kernel/sched/core.c:736 cgroup_move_task+0x92/0x2a0 kernel/sched/psi.c:1170 css_set_move_task+0x658/0x9e0 kernel/cgroup/cgroup.c:918 cgroup_post_fork+0x1ef/0x790 kernel/cgroup/cgroup.c:6759 copy_process+0x3862/0x3c00 kernel/fork.c:2419 kernel_clone+0x21e/0x840 kernel/fork.c:2605 user_mode_thread+0xdd/0x140 kernel/fork.c:2683 rest_init+0x23/0x300 init/main.c:709 start_kernel+0x3a9/0x410 init/main.c:1097 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:307 x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:288 common_startup_64+0x13e/0x147 -> #4 (&p->pi_lock){-.-.}-{2:2}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:557 [inline] try_to_wake_up+0x67/0x12b0 kernel/sched/core.c:4216 create_worker+0x503/0x720 kernel/workqueue.c:2832 workqueue_init+0x3f0/0x6a0 kernel/workqueue.c:7918 kernel_init_freeable+0x302/0x4b0 init/main.c:1564 kernel_init+0x1d/0x1d0 init/main.c:1469 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #3 (&pool->lock){-.-.}-{2:2}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x809/0xfb0 kernel/workqueue.c:-1 queue_work_on+0x181/0x270 kernel/workqueue.c:2390 queue_work include/linux/workqueue.h:669 [inline] rpm_suspend+0xe54/0x1720 drivers/base/power/runtime.c:685 __pm_runtime_idle+0x12f/0x1a0 drivers/base/power/runtime.c:1124 pm_runtime_put include/linux/pm_runtime.h:555 [inline] __device_attach+0x342/0x400 drivers/base/dd.c:1049 bus_probe_device+0x185/0x260 drivers/base/bus.c:537 device_add+0x7b6/0xb50 drivers/base/core.c:3689 serial_base_port_add+0x2e3/0x410 drivers/tty/serial/serial_base_bus.c:183 serial_core_port_device_add drivers/tty/serial/serial_core.c:3309 [inline] serial_core_register_port+0x369/0x27c0 drivers/tty/serial/serial_core.c:3348 serial8250_register_8250_port+0x16db/0x2050 drivers/tty/serial/8250/8250_core.c:829 serial_pnp_probe+0x527/0x790 drivers/tty/serial/8250/8250_pnp.c:480 pnp_device_probe+0x308/0x4c0 drivers/pnp/driver.c:111 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x26d/0x9e0 drivers/base/dd.c:659 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831 __driver_attach+0x452/0x700 drivers/base/dd.c:1217 bus_for_each_dev+0x233/0x2b0 drivers/base/bus.c:370 bus_add_driver+0x345/0x640 drivers/base/bus.c:678 driver_register+0x23a/0x320 drivers/base/driver.c:249 serial8250_init+0x8f/0x160 drivers/tty/serial/8250/8250_platform.c:315 do_one_initcall+0x233/0x820 init/main.c:1269 do_initcall_level+0x104/0x190 init/main.c:1331 do_initcalls+0x59/0xa0 init/main.c:1347 kernel_init_freeable+0x334/0x4b0 init/main.c:1579 kernel_init+0x1d/0x1d0 init/main.c:1469 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #2 (&dev->power.lock){-.-.}-{3:3}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162 __pm_runtime_resume+0x10f/0x180 drivers/base/power/runtime.c:1191 pm_runtime_get include/linux/pm_runtime.h:492 [inline] __uart_start+0x171/0x460 drivers/tty/serial/serial_core.c:149 uart_write+0xdc/0x130 drivers/tty/serial/serial_core.c:636 process_output_block drivers/tty/n_tty.c:561 [inline] n_tty_write+0xd29/0x1200 drivers/tty/n_tty.c:2377 iterate_tty_write drivers/tty/tty_io.c:1006 [inline] file_tty_write+0x551/0xa20 drivers/tty/tty_io.c:1081 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&port_lock_key){-.-.}-{3:3}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162 uart_port_lock_irqsave include/linux/serial_core.h:717 [inline] serial8250_console_write+0x17e/0x1ba0 drivers/tty/serial/8250/8250_port.c:3355 console_emit_next_record kernel/printk/printk.c:3138 [inline] console_flush_all+0x728/0xc40 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xc4/0x270 kernel/printk/printk.c:3325 vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450 _printk+0xcf/0x120 kernel/printk/printk.c:2475 register_console+0xa8b/0xf90 kernel/printk/printk.c:4126 univ8250_console_init+0x3a/0x70 drivers/tty/serial/8250/8250_core.c:516 console_init+0x10e/0x430 kernel/printk/printk.c:4325 start_kernel+0x254/0x410 init/main.c:1035 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:307 x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:288 common_startup_64+0x13e/0x147 -> #0 (console_owner){-.-.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 console_lock_spinning_enable kernel/printk/printk.c:1924 [inline] console_emit_next_record kernel/printk/printk.c:3132 [inline] console_flush_all+0x6d2/0xc40 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xc4/0x270 kernel/printk/printk.c:3325 vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450 _printk+0xcf/0x120 kernel/printk/printk.c:2475 fail_dump lib/fault-inject.c:66 [inline] should_fail_ex+0x3f5/0x560 lib/fault-inject.c:174 strncpy_from_user+0x36/0x290 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x72/0x150 mm/maccess.c:192 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:224 [inline] bpf_probe_read_user_str+0x2a/0x70 kernel/trace/bpf_trace.c:221 bpf_prog_7acee76fef7300d9+0x64/0x6c bpf_dispatcher_nop_func include/linux/bpf.h:1332 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2257 [inline] bpf_trace_run2+0x284/0x4b0 kernel/trace/bpf_trace.c:2298 __bpf_trace_tlb_flush+0xf5/0x150 include/trace/events/tlb.h:38 __do_trace_tlb_flush include/trace/events/tlb.h:38 [inline] trace_tlb_flush+0x115/0x140 include/trace/events/tlb.h:38 switch_mm_irqs_off+0x53e/0x7a0 arch/x86/mm/tlb.c:-1 context_switch kernel/sched/core.c:5341 [inline] __schedule+0x110e/0x4cc0 kernel/sched/core.c:6961 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288 irqentry_exit+0x6f/0x90 kernel/entry/common.c:197 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 __preempt_count_dec_and_test arch/x86/include/asm/preempt.h:95 [inline] class_preempt_notrace_destructor include/linux/preempt.h:473 [inline] __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x31c/0x360 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 __unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:758 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4396 kmalloc_noprof include/linux/slab.h:905 [inline] slab_free_hook mm/slub.c:2369 [inline] slab_free mm/slub.c:4680 [inline] kmem_cache_free+0x166/0x400 mm/slub.c:4782 nf_conntrack_free+0x2f7/0x380 net/netfilter/nf_conntrack_core.c:1747 nf_ct_put include/net/netfilter/nf_conntrack.h:184 [inline] nf_ct_gc_expired+0x246/0x3a0 net/netfilter/nf_conntrack_core.c:726 ____nf_conntrack_find net/netfilter/nf_conntrack_core.c:752 [inline] __nf_conntrack_find_get+0x20b/0x520 net/netfilter/nf_conntrack_core.c:780 nf_conntrack_find_get+0x25d/0x600 net/netfilter/nf_conntrack_core.c:812 ctnetlink_new_conntrack+0x32c/0x2070 net/netfilter/nf_conntrack_netlink.c:-1 nfnetlink_rcv_msg+0xb4d/0x1130 net/netfilter/nfnetlink.c:302 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 nfnetlink_rcv+0x26a/0x2520 net/netfilter/nfnetlink.c:667 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 ____sys_sendmsg+0x505/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: console_owner --> &p->pi_lock --> &rq->__lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->__lock); lock(&p->pi_lock); lock(&rq->__lock); lock(console_owner); *** DEADLOCK *** 6 locks held by syz.0.134/6388: #0: ffffffff99fc7ac0 (nfnl_subsys_ctnetlink){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:98 [inline] #0: ffffffff99fc7ac0 (nfnl_subsys_ctnetlink){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x9dc/0x1130 net/netfilter/nfnetlink.c:295 #1: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #1: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #1: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: nf_conntrack_find_get+0x120/0x600 net/netfilter/nf_conntrack_core.c:810 #2: ffff8880b8639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:636 #3: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #3: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #3: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2256 [inline] #3: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x186/0x4b0 kernel/trace/bpf_trace.c:2298 #4: ffffffff8e12e180 (console_lock){+.+.}-{0:0}, at: _printk+0xcf/0x120 kernel/printk/printk.c:2475 #5: ffffffff8e015a50 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:336 [inline] #5: ffffffff8e015a50 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:319 [inline] #5: ffffffff8e015a50 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:288 [inline] #5: ffffffff8e015a50 (console_srcu){....}-{0:0}, at: console_flush_all+0x13a/0xc40 kernel/printk/printk.c:3203 stack backtrace: CPU: 0 UID: 0 PID: 6388 Comm: syz.0.134 Not tainted 6.17.0-rc1-syzkaller-ge4414b01c1cd #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 console_lock_spinning_enable kernel/printk/printk.c:1924 [inline] console_emit_next_record kernel/printk/printk.c:3132 [inline] console_flush_all+0x6d2/0xc40 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xc4/0x270 kernel/printk/printk.c:3325 vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450 _printk+0xcf/0x120 kernel/printk/printk.c:2475 fail_dump lib/fault-inject.c:66 [inline] should_fail_ex+0x3f5/0x560 lib/fault-inject.c:174 strncpy_from_user+0x36/0x290 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x72/0x150 mm/maccess.c:192 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:224 [inline] bpf_probe_read_user_str+0x2a/0x70 kernel/trace/bpf_trace.c:221 bpf_prog_7acee76fef7300d9+0x64/0x6c bpf_dispatcher_nop_func include/linux/bpf.h:1332 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2257 [inline] bpf_trace_run2+0x284/0x4b0 kernel/trace/bpf_trace.c:2298 __bpf_trace_tlb_flush+0xf5/0x150 include/trace/events/tlb.h:38 __do_trace_tlb_flush include/trace/events/tlb.h:38 [inline] trace_tlb_flush+0x115/0x140 include/trace/events/tlb.h:38 switch_mm_irqs_off+0x53e/0x7a0 arch/x86/mm/tlb.c:-1 context_switch kernel/sched/core.c:5341 [inline] __schedule+0x110e/0x4cc0 kernel/sched/core.c:6961 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288 irqentry_exit+0x6f/0x90 kernel/entry/common.c:197 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__preempt_count_dec_and_test arch/x86/include/asm/preempt.h:-1 [inline] RIP: 0010:class_preempt_notrace_destructor include/linux/preempt.h:473 [inline] RIP: 0010:__do_trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:lock_acquire+0x31c/0x360 kernel/locking/lockdep.c:5831 Code: 08 8b 4c 24 04 4c 8b 44 24 20 4c 8b 4c 24 28 ff b4 24 98 00 00 00 ff 74 24 18 e8 8f 43 ff ff 48 83 c4 10 65 ff 0d 54 e2 02 11 <8b> 5c 24 08 4c 8b 74 24 10 4c 8b 7c 24 28 4c 8b 64 24 20 48 8b ac RSP: 0018:ffffc9000dbe6378 EFLAGS: 00000286 RAX: 9ac7bad3a8ac5b00 RBX: 0000000000000000 RCX: ffffe8ffffc3e0a8 RDX: 0000000000000000 RSI: ffffffff8be33360 RDI: ffffffff8be33320 RBP: ffffffff8172c195 R08: 0000000000000002 R09: 0000000000000000 R10: ffffc9000dbe6548 R11: fffff52001b7ccb5 R12: 0000000000000002 R13: ffffffff8e139ee0 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 __unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:758 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4396 kmalloc_noprof include/linux/slab.h:905 [inline] slab_free_hook mm/slub.c:2369 [inline] slab_free mm/slub.c:4680 [inline] kmem_cache_free+0x166/0x400 mm/slub.c:4782 nf_conntrack_free+0x2f7/0x380 net/netfilter/nf_conntrack_core.c:1747 nf_ct_put include/net/netfilter/nf_conntrack.h:184 [inline] nf_ct_gc_expired+0x246/0x3a0 net/netfilter/nf_conntrack_core.c:726 ____nf_conntrack_find net/netfilter/nf_conntrack_core.c:752 [inline] __nf_conntrack_find_get+0x20b/0x520 net/netfilter/nf_conntrack_core.c:780 nf_conntrack_find_get+0x25d/0x600 net/netfilter/nf_conntrack_core.c:812 ctnetlink_new_conntrack+0x32c/0x2070 net/netfilter/nf_conntrack_netlink.c:-1 nfnetlink_rcv_msg+0xb4d/0x1130 net/netfilter/nfnetlink.c:302 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 nfnetlink_rcv+0x26a/0x2520 net/netfilter/nfnetlink.c:667 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 ____sys_sendmsg+0x505/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3d66d8ebe9 Code: Unable to access opcode bytes at 0x7f3d66d8ebbf. RSP: 002b:00007f3d67c22038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f3d66fb5fa0 RCX: 00007f3d66d8ebe9 RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000003 RBP: 00007f3d67c22090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f3d66fb6038 R14: 00007f3d66fb5fa0 R15: 00007ffda6e84a58 CPU: 0 UID: 0 PID: 6388 Comm: syz.0.134 Not tainted 6.17.0-rc1-syzkaller-ge4414b01c1cd #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 fail_dump lib/fault-inject.c:73 [inline] should_fail_ex+0x414/0x560 lib/fault-inject.c:174 strncpy_from_user+0x36/0x290 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x72/0x150 mm/maccess.c:192 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:224 [inline] bpf_probe_read_user_str+0x2a/0x70 kernel/trace/bpf_trace.c:221 bpf_prog_7acee76fef7300d9+0x64/0x6c bpf_dispatcher_nop_func include/linux/bpf.h:1332 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2257 [inline] bpf_trace_run2+0x284/0x4b0 kernel/trace/bpf_trace.c:2298 __bpf_trace_tlb_flush+0xf5/0x150 include/trace/events/tlb.h:38 __do_trace_tlb_flush include/trace/events/tlb.h:38 [inline] trace_tlb_flush+0x115/0x140 include/trace/events/tlb.h:38 switch_mm_irqs_off+0x53e/0x7a0 arch/x86/mm/tlb.c:-1 context_switch kernel/sched/core.c:5341 [inline] __schedule+0x110e/0x4cc0 kernel/sched/core.c:6961 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288 irqentry_exit+0x6f/0x90 kernel/entry/common.c:197 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__preempt_count_dec_and_test arch/x86/include/asm/preempt.h:-1 [inline] RIP: 0010:class_preempt_notrace_destructor include/linux/preempt.h:473 [inline] RIP: 0010:__do_trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:lock_acquire+0x31c/0x360 kernel/locking/lockdep.c:5831 Code: 08 8b 4c 24 04 4c 8b 44 24 20 4c 8b 4c 24 28 ff b4 24 98 00 00 00 ff 74 24 18 e8 8f 43 ff ff 48 83 c4 10 65 ff 0d 54 e2 02 11 <8b> 5c 24 08 4c 8b 74 24 10 4c 8b 7c 24 28 4c 8b 64 24 20 48 8b ac RSP: 0018:ffffc9000dbe6378 EFLAGS: 00000286 RAX: 9ac7bad3a8ac5b00 RBX: 0000000000000000 RCX: ffffe8ffffc3e0a8 RDX: 0000000000000000 RSI: ffffffff8be33360 RDI: ffffffff8be33320 RBP: ffffffff8172c195 R08: 0000000000000002 R09: 0000000000000000 R10: ffffc9000dbe6548 R11: fffff52001b7ccb5 R12: 0000000000000002 R13: ffffffff8e139ee0 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 __unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:758 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4396 kmalloc_noprof include/linux/slab.h:905 [inline] slab_free_hook mm/slub.c:2369 [inline] slab_free mm/slub.c:4680 [inline] kmem_cache_free+0x166/0x400 mm/slub.c:4782 nf_conntrack_free+0x2f7/0x380 net/netfilter/nf_conntrack_core.c:1747 nf_ct_put include/net/netfilter/nf_conntrack.h:184 [inline] nf_ct_gc_expired+0x246/0x3a0 net/netfilter/nf_conntrack_core.c:726 ____nf_conntrack_find net/netfilter/nf_conntrack_core.c:752 [inline] __nf_conntrack_find_get+0x20b/0x520 net/netfilter/nf_conntrack_core.c:780 nf_conntrack_find_get+0x25d/0x600 net/netfilter/nf_conntrack_core.c:812 ctnetlink_new_conntrack+0x32c/0x2070 net/netfilter/nf_conntrack_netlink.c:-1 nfnetlink_rcv_msg+0xb4d/0x1130 net/netfilter/nfnetlink.c:302 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 nfnetlink_rcv+0x26a/0x2520 net/netfilter/nfnetlink.c:667 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 ____sys_sendmsg+0x505/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3d66d8ebe9 Code: Unable to access opcode bytes at 0x7f3d66d8ebbf. RSP: 002b:00007f3d67c22038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f3d66fb5fa0 RCX: 00007f3d66d8ebe9 RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000003 RBP: 00007f3d67c22090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f3d66fb6038 R14: 00007f3d66fb5fa0 R15: 00007ffda6e84a58 syz.0.134 (6388) used greatest stack depth: 17288 bytes left ---------------- Code disassembly (best guess): 0: 08 8b 4c 24 04 4c or %cl,0x4c04244c(%rbx) 6: 8b 44 24 20 mov 0x20(%rsp),%eax a: 4c 8b 4c 24 28 mov 0x28(%rsp),%r9 f: ff b4 24 98 00 00 00 push 0x98(%rsp) 16: ff 74 24 18 push 0x18(%rsp) 1a: e8 8f 43 ff ff call 0xffff43ae 1f: 48 83 c4 10 add $0x10,%rsp 23: 65 ff 0d 54 e2 02 11 decl %gs:0x1102e254(%rip) # 0x1102e27e * 2a: 8b 5c 24 08 mov 0x8(%rsp),%ebx <-- trapping instruction 2e: 4c 8b 74 24 10 mov 0x10(%rsp),%r14 33: 4c 8b 7c 24 28 mov 0x28(%rsp),%r15 38: 4c 8b 64 24 20 mov 0x20(%rsp),%r12 3d: 48 rex.W 3e: 8b .byte 0x8b 3f: ac lods %ds:(%rsi),%al