FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 ====================================================== WARNING: possible circular locking dependency detected 6.6.101-syzkaller #0 Not tainted ------------------------------------------------------ syz.6.3327/14589 is trying to acquire lock: ffffffff8cd23e00 (console_owner){-.-.}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:339 [inline] ffffffff8cd23e00 (console_owner){-.-.}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline] ffffffff8cd23e00 (console_owner){-.-.}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:292 [inline] ffffffff8cd23e00 (console_owner){-.-.}-{0:0}, at: console_flush_all+0x10f/0xd00 kernel/printk/printk.c:2992 but task is already holding lock: ffff8880b8e3c458 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&rq->__lock){-.-.}-{2:2}: _raw_spin_lock_nested+0x32/0x50 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558 raw_spin_rq_lock kernel/sched/sched.h:1372 [inline] rq_lock kernel/sched/sched.h:1681 [inline] task_fork_fair+0x62/0x1f0 kernel/sched/fair.c:12662 sched_cgroup_fork+0x333/0x3c0 kernel/sched/core.c:4817 copy_process+0x21e4/0x3d70 kernel/fork.c:2614 kernel_clone+0x21b/0x840 kernel/fork.c:2914 user_mode_thread+0xde/0x130 kernel/fork.c:2992 rest_init+0x27/0x300 init/main.c:697 arch_call_rest_init+0xe/0x10 init/main.c:829 start_kernel+0x459/0x4e0 init/main.c:1074 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555 copy_bootdata+0x0/0xe0 arch/x86/kernel/head64.c:536 secondary_startup_64_no_verify+0x179/0x17b -> #4 (&p->pi_lock){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:522 [inline] try_to_wake_up+0x61/0x10b0 kernel/sched/core.c:4233 kick_pool+0x320/0x420 kernel/workqueue.c:1146 create_worker+0x5c0/0x7b0 kernel/workqueue.c:2218 workqueue_init+0x306/0x670 kernel/workqueue.c:6736 kernel_init_freeable+0x3a0/0x570 init/main.c:1538 kernel_init+0x1d/0x1c0 init/main.c:1443 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 -> #3 (&pool->lock){-.-.}-{2:2}: __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x69f/0x1020 kernel/workqueue.c:1764 queue_work_on+0x121/0x1e0 kernel/workqueue.c:1835 queue_work include/linux/workqueue.h:562 [inline] rpm_suspend+0x10bc/0x1a90 drivers/base/power/runtime.c:660 __pm_runtime_idle+0x12f/0x1a0 drivers/base/power/runtime.c:1102 pm_runtime_put include/linux/pm_runtime.h:462 [inline] __device_attach+0x33f/0x400 drivers/base/dd.c:1048 bus_probe_device+0x180/0x260 drivers/base/bus.c:534 device_add+0x85b/0xc20 drivers/base/core.c:3683 serial_base_port_add+0x2f2/0x420 drivers/tty/serial/serial_base_bus.c:178 serial_core_port_device_add drivers/tty/serial/serial_core.c:3382 [inline] serial_core_register_port+0x36d/0x2320 drivers/tty/serial/serial_core.c:3423 serial8250_register_8250_port+0x15ec/0x1f10 drivers/tty/serial/8250/8250_core.c:1142 serial_pnp_probe+0x549/0x730 drivers/tty/serial/8250/8250_pnp.c:478 pnp_device_probe+0x305/0x4b0 drivers/pnp/driver.c:111 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x25b/0xb40 drivers/base/dd.c:658 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:800 driver_probe_device+0x4f/0x420 drivers/base/dd.c:830 __driver_attach+0x44e/0x6f0 drivers/base/dd.c:1216 bus_for_each_dev+0x22d/0x2a0 drivers/base/bus.c:370 bus_add_driver+0x340/0x640 drivers/base/bus.c:675 driver_register+0x23a/0x310 drivers/base/driver.c:246 serial8250_init+0x9a/0x170 drivers/tty/serial/8250/8250_core.c:1243 do_one_initcall+0x1fd/0x750 init/main.c:1238 do_initcall_level+0x137/0x1f0 init/main.c:1300 do_initcalls+0x69/0xd0 init/main.c:1316 kernel_init_freeable+0x3d2/0x570 init/main.c:1553 kernel_init+0x1d/0x1c0 init/main.c:1443 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 -> #2 (&dev->power.lock){-...}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162 __pm_runtime_resume+0x10f/0x170 drivers/base/power/runtime.c:1169 pm_runtime_get include/linux/pm_runtime.h:410 [inline] __uart_start+0x171/0x3e0 drivers/tty/serial/serial_core.c:148 uart_write+0x449/0x5d0 drivers/tty/serial/serial_core.c:633 process_output_block drivers/tty/n_tty.c:580 [inline] n_tty_write+0xd27/0x11d0 drivers/tty/n_tty.c:2395 iterate_tty_write drivers/tty/tty_io.c:1017 [inline] file_tty_write+0x54b/0x980 drivers/tty/tty_io.c:1088 call_write_iter include/linux/fs.h:2018 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x43b/0x940 fs/read_write.c:584 ksys_write+0x147/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (&port_lock_key){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162 serial8250_console_write+0x16d/0x17a0 drivers/tty/serial/8250/8250_port.c:3434 console_emit_next_record kernel/printk/printk.c:2944 [inline] console_flush_all+0x6cd/0xd00 kernel/printk/printk.c:3000 console_unlock+0xae/0x340 kernel/printk/printk.c:3069 vprintk_emit+0x477/0x600 kernel/printk/printk.c:2341 _printk+0xd0/0x110 kernel/printk/printk.c:2366 register_console+0x91b/0xe60 kernel/printk/printk.c:3583 univ8250_console_init+0x45/0x50 drivers/tty/serial/8250/8250_core.c:717 console_init+0x17b/0x5e0 kernel/printk/printk.c:3726 start_kernel+0x2c0/0x4e0 init/main.c:1010 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555 copy_bootdata+0x0/0xe0 arch/x86/kernel/head64.c:536 secondary_startup_64_no_verify+0x179/0x17b -> #0 (console_owner){-.-.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 console_lock_spinning_enable kernel/printk/printk.c:1871 [inline] console_emit_next_record kernel/printk/printk.c:2938 [inline] console_flush_all+0x693/0xd00 kernel/printk/printk.c:3000 console_unlock+0xae/0x340 kernel/printk/printk.c:3069 vprintk_emit+0x477/0x600 kernel/printk/printk.c:2341 _printk+0xd0/0x110 kernel/printk/printk.c:2366 fail_dump lib/fault-inject.c:45 [inline] should_fail_ex+0x37e/0x4d0 lib/fault-inject.c:153 strncpy_from_user+0x36/0x2e0 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:212 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:221 [inline] bpf_probe_read_user_str+0x2a/0x70 kernel/trace/bpf_trace.c:218 bpf_prog_693483806bd7978c+0x63/0x67 bpf_dispatcher_nop_func include/linux/bpf.h:1213 [inline] __bpf_prog_run include/linux/filter.h:612 [inline] bpf_prog_run include/linux/filter.h:619 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2322 [inline] bpf_trace_run2+0x1d1/0x3c0 kernel/trace/bpf_trace.c:2361 __bpf_trace_tlb_flush+0xf6/0x150 include/trace/events/tlb.h:38 trace_tlb_flush+0xea/0x110 include/trace/events/tlb.h:38 switch_mm_irqs_off+0x7aa/0xb10 arch/x86/mm/tlb.c:-1 context_switch kernel/sched/core.c:5365 [inline] __schedule+0xf22/0x44d0 kernel/sched/core.c:6700 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7010 irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 preempt_count_add+0x123/0x1a0 kernel/sched/core.c:5841 unwind_next_frame+0xbe/0x2970 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 save_stack+0xf7/0x1f0 mm/page_owner.c:128 __reset_page_owner+0x4e/0x190 mm/page_owner.c:149 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1154 [inline] free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429 discard_slab mm/slub.c:2122 [inline] __unfreeze_partials+0x1cf/0x210 mm/slub.c:2662 put_cpu_partial+0x17c/0x250 mm/slub.c:2738 __slab_free+0x31d/0x410 mm/slub.c:3686 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3485 [inline] __kmem_cache_alloc_node+0x13e/0x260 mm/slub.c:3524 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0xa4/0x230 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [inline] kzalloc_node include/linux/slab.h:732 [inline] qdisc_alloc+0x94/0xa50 net/sched/sch_generic.c:948 qdisc_create_dflt+0x63/0x430 net/sched/sch_generic.c:1009 attach_one_default_qdisc net/sched/sch_generic.c:1173 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2520 [inline] attach_default_qdiscs net/sched/sch_generic.c:1191 [inline] dev_activate+0x397/0x11a0 net/sched/sch_generic.c:1250 __dev_open+0x338/0x430 net/core/dev.c:1515 __dev_change_flags+0x20e/0x6a0 net/core/dev.c:8673 dev_change_flags+0x88/0x1a0 net/core/dev.c:8745 dev_ifsioc+0x6a7/0xe20 net/core/dev_ioctl.c:529 dev_ioctl+0x7e2/0x1170 net/core/dev_ioctl.c:786 sock_do_ioctl+0x226/0x2f0 net/socket.c:1236 sock_ioctl+0x623/0x7a0 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 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 *** 7 locks held by syz.6.3327/14589: #0: ffffffff8dfbb888 (rtnl_mutex){+.+.}-{3:3}, at: dev_ioctl+0x7d2/0x1170 net/core/dev_ioctl.c:785 #1: ffffffff8ce2cf60 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:116 [inline] #1: ffffffff8ce2cf60 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x24/0x50 include/linux/srcu.h:215 #2: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #2: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #2: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: page_ext_get+0x22/0x2b0 mm/page_ext.c:508 #3: ffff8880b8e3c458 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558 #4: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #4: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #4: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2321 [inline] #4: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xde/0x3c0 kernel/trace/bpf_trace.c:2361 #5: ffffffff8cd23ee0 (console_lock){+.+.}-{0:0}, at: _printk+0xd0/0x110 kernel/printk/printk.c:2366 #6: ffffffff8cc0b6f0 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:339 [inline] #6: ffffffff8cc0b6f0 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline] #6: ffffffff8cc0b6f0 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:292 [inline] #6: ffffffff8cc0b6f0 (console_srcu){....}-{0:0}, at: console_flush_all+0x10f/0xd00 kernel/printk/printk.c:2992 stack backtrace: CPU: 0 PID: 14589 Comm: syz.6.3327 Not tainted 6.6.101-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 console_lock_spinning_enable kernel/printk/printk.c:1871 [inline] console_emit_next_record kernel/printk/printk.c:2938 [inline] console_flush_all+0x693/0xd00 kernel/printk/printk.c:3000 console_unlock+0xae/0x340 kernel/printk/printk.c:3069 vprintk_emit+0x477/0x600 kernel/printk/printk.c:2341 _printk+0xd0/0x110 kernel/printk/printk.c:2366 fail_dump lib/fault-inject.c:45 [inline] should_fail_ex+0x37e/0x4d0 lib/fault-inject.c:153 strncpy_from_user+0x36/0x2e0 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:212 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:221 [inline] bpf_probe_read_user_str+0x2a/0x70 kernel/trace/bpf_trace.c:218 bpf_prog_693483806bd7978c+0x63/0x67 bpf_dispatcher_nop_func include/linux/bpf.h:1213 [inline] __bpf_prog_run include/linux/filter.h:612 [inline] bpf_prog_run include/linux/filter.h:619 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2322 [inline] bpf_trace_run2+0x1d1/0x3c0 kernel/trace/bpf_trace.c:2361 __bpf_trace_tlb_flush+0xf6/0x150 include/trace/events/tlb.h:38 trace_tlb_flush+0xea/0x110 include/trace/events/tlb.h:38 switch_mm_irqs_off+0x7aa/0xb10 arch/x86/mm/tlb.c:-1 context_switch kernel/sched/core.c:5365 [inline] __schedule+0xf22/0x44d0 kernel/sched/core.c:6700 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7010 irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:preempt_count_add+0x123/0x1a0 kernel/sched/core.c:5841 Code: ff 48 c7 c7 c0 47 aa 8a 48 c7 c6 00 48 aa 8a e8 63 97 f4 ff 89 df 0f 0b e9 5e ff ff ff 48 c7 c1 80 a4 ea 96 80 e1 07 80 c1 03 <38> c1 0f 8c 00 ff ff ff 89 fb 48 c7 c7 80 a4 ea 96 e8 d7 67 81 00 RSP: 0018:ffffc90003fd7158 EFLAGS: 00000206 RAX: 0000000000000004 RBX: 1ffff920007fae49 RCX: ffffffff96eaa403 RDX: ffff888022843c00 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 0000000000000001 R08: ffffc90003fd7310 R09: 0000000000000007 R10: 0000000000000004 R11: 0000000000000000 R12: ffffc90003fd7248 R13: dffffc0000000000 R14: ffffc90003fd7280 R15: dffffc0000000000 unwind_next_frame+0xbe/0x2970 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 save_stack+0xf7/0x1f0 mm/page_owner.c:128 __reset_page_owner+0x4e/0x190 mm/page_owner.c:149 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1154 [inline] free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429 discard_slab mm/slub.c:2122 [inline] __unfreeze_partials+0x1cf/0x210 mm/slub.c:2662 put_cpu_partial+0x17c/0x250 mm/slub.c:2738 __slab_free+0x31d/0x410 mm/slub.c:3686 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3485 [inline] __kmem_cache_alloc_node+0x13e/0x260 mm/slub.c:3524 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0xa4/0x230 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [inline] kzalloc_node include/linux/slab.h:732 [inline] qdisc_alloc+0x94/0xa50 net/sched/sch_generic.c:948 qdisc_create_dflt+0x63/0x430 net/sched/sch_generic.c:1009 attach_one_default_qdisc net/sched/sch_generic.c:1173 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2520 [inline] attach_default_qdiscs net/sched/sch_generic.c:1191 [inline] dev_activate+0x397/0x11a0 net/sched/sch_generic.c:1250 __dev_open+0x338/0x430 net/core/dev.c:1515 __dev_change_flags+0x20e/0x6a0 net/core/dev.c:8673 dev_change_flags+0x88/0x1a0 net/core/dev.c:8745 dev_ifsioc+0x6a7/0xe20 net/core/dev_ioctl.c:529 dev_ioctl+0x7e2/0x1170 net/core/dev_ioctl.c:786 sock_do_ioctl+0x226/0x2f0 net/socket.c:1236 sock_ioctl+0x623/0x7a0 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f078698eb69 Code: Unable to access opcode bytes at 0x7f078698eb3f. RSP: 002b:00007f078780d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f0786bb5fa0 RCX: 00007f078698eb69 RDX: 0000200000000100 RSI: 0000000000008914 RDI: 0000000000000005 RBP: 00007f078780d090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f0786bb5fa0 R15: 00007fffe6d2cfc8 CPU: 0 PID: 14589 Comm: syz.6.3327 Not tainted 6.6.101-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 fail_dump lib/fault-inject.c:52 [inline] should_fail_ex+0x39d/0x4d0 lib/fault-inject.c:153 strncpy_from_user+0x36/0x2e0 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:212 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:221 [inline] bpf_probe_read_user_str+0x2a/0x70 kernel/trace/bpf_trace.c:218 bpf_prog_693483806bd7978c+0x63/0x67 bpf_dispatcher_nop_func include/linux/bpf.h:1213 [inline] __bpf_prog_run include/linux/filter.h:612 [inline] bpf_prog_run include/linux/filter.h:619 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2322 [inline] bpf_trace_run2+0x1d1/0x3c0 kernel/trace/bpf_trace.c:2361 __bpf_trace_tlb_flush+0xf6/0x150 include/trace/events/tlb.h:38 trace_tlb_flush+0xea/0x110 include/trace/events/tlb.h:38 switch_mm_irqs_off+0x7aa/0xb10 arch/x86/mm/tlb.c:-1 context_switch kernel/sched/core.c:5365 [inline] __schedule+0xf22/0x44d0 kernel/sched/core.c:6700 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7010 irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:preempt_count_add+0x123/0x1a0 kernel/sched/core.c:5841 Code: ff 48 c7 c7 c0 47 aa 8a 48 c7 c6 00 48 aa 8a e8 63 97 f4 ff 89 df 0f 0b e9 5e ff ff ff 48 c7 c1 80 a4 ea 96 80 e1 07 80 c1 03 <38> c1 0f 8c 00 ff ff ff 89 fb 48 c7 c7 80 a4 ea 96 e8 d7 67 81 00 RSP: 0018:ffffc90003fd7158 EFLAGS: 00000206 RAX: 0000000000000004 RBX: 1ffff920007fae49 RCX: ffffffff96eaa403 RDX: ffff888022843c00 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 0000000000000001 R08: ffffc90003fd7310 R09: 0000000000000007 R10: 0000000000000004 R11: 0000000000000000 R12: ffffc90003fd7248 R13: dffffc0000000000 R14: ffffc90003fd7280 R15: dffffc0000000000 unwind_next_frame+0xbe/0x2970 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 save_stack+0xf7/0x1f0 mm/page_owner.c:128 __reset_page_owner+0x4e/0x190 mm/page_owner.c:149 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1154 [inline] free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429 discard_slab mm/slub.c:2122 [inline] __unfreeze_partials+0x1cf/0x210 mm/slub.c:2662 put_cpu_partial+0x17c/0x250 mm/slub.c:2738 __slab_free+0x31d/0x410 mm/slub.c:3686 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3485 [inline] __kmem_cache_alloc_node+0x13e/0x260 mm/slub.c:3524 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0xa4/0x230 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [inline] kzalloc_node include/linux/slab.h:732 [inline] qdisc_alloc+0x94/0xa50 net/sched/sch_generic.c:948 qdisc_create_dflt+0x63/0x430 net/sched/sch_generic.c:1009 attach_one_default_qdisc net/sched/sch_generic.c:1173 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2520 [inline] attach_default_qdiscs net/sched/sch_generic.c:1191 [inline] dev_activate+0x397/0x11a0 net/sched/sch_generic.c:1250 __dev_open+0x338/0x430 net/core/dev.c:1515 __dev_change_flags+0x20e/0x6a0 net/core/dev.c:8673 dev_change_flags+0x88/0x1a0 net/core/dev.c:8745 dev_ifsioc+0x6a7/0xe20 net/core/dev_ioctl.c:529 dev_ioctl+0x7e2/0x1170 net/core/dev_ioctl.c:786 sock_do_ioctl+0x226/0x2f0 net/socket.c:1236 sock_ioctl+0x623/0x7a0 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f078698eb69 Code: Unable to access opcode bytes at 0x7f078698eb3f. RSP: 002b:00007f078780d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f0786bb5fa0 RCX: 00007f078698eb69 RDX: 0000200000000100 RSI: 0000000000008914 RDI: 0000000000000005 RBP: 00007f078780d090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f0786bb5fa0 R15: 00007fffe6d2cfc8 ---------------- Code disassembly (best guess): 0: ff 48 c7 decl -0x39(%rax) 3: c7 c0 47 aa 8a 48 mov $0x488aaa47,%eax 9: c7 c6 00 48 aa 8a mov $0x8aaa4800,%esi f: e8 63 97 f4 ff call 0xfff49777 14: 89 df mov %ebx,%edi 16: 0f 0b ud2 18: e9 5e ff ff ff jmp 0xffffff7b 1d: 48 c7 c1 80 a4 ea 96 mov $0xffffffff96eaa480,%rcx 24: 80 e1 07 and $0x7,%cl 27: 80 c1 03 add $0x3,%cl * 2a: 38 c1 cmp %al,%cl <-- trapping instruction 2c: 0f 8c 00 ff ff ff jl 0xffffff32 32: 89 fb mov %edi,%ebx 34: 48 c7 c7 80 a4 ea 96 mov $0xffffffff96eaa480,%rdi 3b: e8 d7 67 81 00 call 0x816817