FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
6.16.0-syzkaller-12187-g0227b49b5027 #0 Not tainted
------------------------------------------------------
syz.1.3081/21564 is trying to acquire lock:
ffffffff8e4ce7a0 (console_owner){-.-.}-{0:0}, at: console_lock_spinning_enable+0x9f/0xd0 kernel/printk/printk.c:1924

but task is already holding lock:
ffff8880b843a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:644 [inline]
ffff8880b843a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:629

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&rq->__lock){-.-.}-{2:2}:
       _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:636
       raw_spin_rq_lock kernel/sched/sched.h:1519 [inline]
       task_rq_lock+0xcf/0x490 kernel/sched/core.c:736
       cgroup_move_task+0x81/0x2a0 kernel/sched/psi.c:1170
       css_set_move_task+0x288/0x5f0 kernel/cgroup/cgroup.c:918
       cgroup_post_fork+0x201/0x9e0 kernel/cgroup/cgroup.c:6759
       copy_process+0x5cfa/0x7690 kernel/fork.c:2419
       kernel_clone+0xfc/0x930 kernel/fork.c:2605
       user_mode_thread+0xc7/0x110 kernel/fork.c:2683
       rest_init+0x23/0x2b0 init/main.c:709
       start_kernel+0x3ee/0x4d0 init/main.c:1097
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:307
       x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:288
       common_startup_64+0x13e/0x148

-> #3 (&p->pi_lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:557 [inline]
       try_to_wake_up+0xb7/0x1870 kernel/sched/core.c:4216
       __wake_up_common+0x135/0x1f0 kernel/sched/wait.c:108
       __wake_up_common_lock kernel/sched/wait.c:125 [inline]
       __wake_up+0x31/0x60 kernel/sched/wait.c:146
       tty_port_default_wakeup+0x2a/0x40 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x68e/0x860 drivers/tty/serial/8250/8250_port.c:1728
       serial8250_handle_irq+0x761/0xcb0 drivers/tty/serial/8250/8250_port.c:1836
       serial8250_default_handle_irq+0x9a/0x250 drivers/tty/serial/8250/8250_port.c:1856
       serial8250_interrupt+0xf5/0x1b0 drivers/tty/serial/8250/8250_core.c:82
       __handle_irq_event_percpu+0x22c/0x7d0 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
       handle_edge_irq+0x3ca/0x9e0 kernel/irq/chip.c:855
       generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
       handle_irq arch/x86/kernel/irq.c:254 [inline]
       call_irq_handler arch/x86/kernel/irq.c:266 [inline]
       __common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:292
       common_interrupt+0xba/0xe0 arch/x86/kernel/irq.c:285
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
       native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
       pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:81
       arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
       default_idle+0x13/0x20 arch/x86/kernel/process.c:757
       default_idle_call+0x6d/0xb0 kernel/sched/idle.c:122
       cpuidle_idle_call kernel/sched/idle.c:190 [inline]
       do_idle+0x391/0x510 kernel/sched/idle.c:330
       cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:428
       start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315
       common_startup_64+0x13e/0x148

-> #2 (&tty->write_wait){-.-.}-{3:3}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       __wake_up_common_lock kernel/sched/wait.c:124 [inline]
       __wake_up+0x1c/0x60 kernel/sched/wait.c:146
       tty_port_default_wakeup+0x2a/0x40 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x68e/0x860 drivers/tty/serial/8250/8250_port.c:1728
       serial8250_handle_irq+0x761/0xcb0 drivers/tty/serial/8250/8250_port.c:1836
       serial8250_default_handle_irq+0x9a/0x250 drivers/tty/serial/8250/8250_port.c:1856
       serial8250_interrupt+0xf5/0x1b0 drivers/tty/serial/8250/8250_core.c:82
       __handle_irq_event_percpu+0x22c/0x7d0 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
       handle_edge_irq+0x3ca/0x9e0 kernel/irq/chip.c:855
       generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
       handle_irq arch/x86/kernel/irq.c:254 [inline]
       call_irq_handler arch/x86/kernel/irq.c:266 [inline]
       __common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:292
       common_interrupt+0xba/0xe0 arch/x86/kernel/irq.c:285
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
       native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
       pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:81
       arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
       default_idle+0x13/0x20 arch/x86/kernel/process.c:757
       default_idle_call+0x6d/0xb0 kernel/sched/idle.c:122
       cpuidle_idle_call kernel/sched/idle.c:190 [inline]
       do_idle+0x391/0x510 kernel/sched/idle.c:330
       cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:428
       start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315
       common_startup_64+0x13e/0x148

-> #1 (&port_lock_key){-.-.}-{3:3}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       uart_port_lock_irqsave include/linux/serial_core.h:717 [inline]
       serial8250_console_write+0x181/0x1890 drivers/tty/serial/8250/8250_port.c:3355
       console_emit_next_record kernel/printk/printk.c:3138 [inline]
       console_flush_all+0x801/0xc60 kernel/printk/printk.c:3226
       __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
       console_unlock+0xd8/0x210 kernel/printk/printk.c:3325
       vprintk_emit+0x418/0x6d0 kernel/printk/printk.c:2450
       _printk+0xc7/0x100 kernel/printk/printk.c:2475
       register_console+0xc2d/0x11b0 kernel/printk/printk.c:4126
       univ8250_console_init+0x5f/0x90 drivers/tty/serial/8250/8250_core.c:516
       console_init+0x14f/0x680 kernel/printk/printk.c:4325
       start_kernel+0x29f/0x4d0 init/main.c:1035
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:307
       x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:288
       common_startup_64+0x13e/0x148

-> #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 kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
       console_lock_spinning_enable+0xb0/0xd0 kernel/printk/printk.c:1924
       console_emit_next_record kernel/printk/printk.c:3132 [inline]
       console_flush_all+0x7aa/0xc60 kernel/printk/printk.c:3226
       __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
       console_unlock+0xd8/0x210 kernel/printk/printk.c:3325
       vprintk_emit+0x418/0x6d0 kernel/printk/printk.c:2450
       _printk+0xc7/0x100 kernel/printk/printk.c:2475
       fail_dump lib/fault-inject.c:66 [inline]
       should_fail_ex+0x4e7/0x640 lib/fault-inject.c:174
       strncpy_from_user+0x3b/0x2e0 lib/strncpy_from_user.c:118
       strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:192
       bpf_trace_copy_string kernel/bpf/helpers.c:761 [inline]
       bpf_bprintf_prepare+0xe90/0x13f0 kernel/bpf/helpers.c:976
       ____bpf_trace_printk kernel/trace/bpf_trace.c:373 [inline]
       bpf_trace_printk+0xda/0x190 kernel/trace/bpf_trace.c:363
       bpf_prog_7c77c7e0f6645ad8+0x3e/0x44
       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+0x236/0x590 kernel/trace/bpf_trace.c:2298
       __bpf_trace_contention_begin+0xc9/0x110 include/trace/events/lock.h:95
       __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_contention_begin include/trace/events/lock.h:95 [inline]
       trace_contention_begin.constprop.0+0xde/0x160 include/trace/events/lock.h:95
       __pv_queued_spin_lock_slowpath+0x109/0xcf0 kernel/locking/qspinlock.c:219
       pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:557 [inline]
       queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
       queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
       do_raw_spin_lock+0x20e/0x2b0 kernel/locking/spinlock_debug.c:116
       raw_spin_rq_lock_nested kernel/sched/core.c:644 [inline]
       raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:629
       raw_spin_rq_lock kernel/sched/sched.h:1519 [inline]
       rq_lock kernel/sched/sched.h:1841 [inline]
       __schedule+0x307/0x5de0 kernel/sched/core.c:6865
       preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288
       irqentry_exit+0x36/0x90 kernel/entry/common.c:197
       asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
       on_stack arch/x86/include/asm/stacktrace.h:55 [inline]
       __unwind_start+0x48c/0x7f0 arch/x86/kernel/unwind_orc.c:756
       unwind_start arch/x86/include/asm/unwind.h:64 [inline]
       arch_stack_walk+0x73/0x100 arch/x86/kernel/stacktrace.c:24
       stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
       kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
       kasan_save_track+0x14/0x30 mm/kasan/common.c:68
       poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
       __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405
       kasan_kmalloc include/linux/kasan.h:260 [inline]
       __do_kmalloc_node mm/slub.c:4365 [inline]
       __kmalloc_noprof+0x223/0x510 mm/slub.c:4377
       kmalloc_noprof include/linux/slab.h:909 [inline]
       kzalloc_noprof include/linux/slab.h:1039 [inline]
       tomoyo_encode2+0x100/0x3e0 security/tomoyo/realpath.c:45
       tomoyo_encode+0x29/0x50 security/tomoyo/realpath.c:80
       tomoyo_realpath_from_path+0x18f/0x6e0 security/tomoyo/realpath.c:283
       tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
       tomoyo_path_number_perm+0x245/0x580 security/tomoyo/file.c:723
       security_file_ioctl+0x9b/0x240 security/security.c:2943
       __do_sys_ioctl fs/ioctl.c:592 [inline]
       __se_sys_ioctl fs/ioctl.c:584 [inline]
       __x64_sys_ioctl+0xb7/0x210 fs/ioctl.c:584
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0x4c0 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 ***

5 locks held by syz.1.3081/21564:
 #0: ffffffff8f05b270 (tomoyo_ss){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
 #0: ffffffff8f05b270 (tomoyo_ss){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
 #0: ffffffff8f05b270 (tomoyo_ss){.+.+}-{0:0}, at: tomoyo_read_lock security/tomoyo/common.h:1108 [inline]
 #0: ffffffff8f05b270 (tomoyo_ss){.+.+}-{0:0}, at: tomoyo_path_number_perm+0x237/0x580 security/tomoyo/file.c:722
 #1: ffff8880b843a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:644 [inline]
 #1: ffff8880b843a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:629
 #2: ffffffff8e5c1160 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #2: ffffffff8e5c1160 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #2: ffffffff8e5c1160 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2256 [inline]
 #2: ffffffff8e5c1160 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x1bc/0x590 kernel/trace/bpf_trace.c:2298
 #3: ffffffff8e5aebe0 (console_lock){+.+.}-{0:0}, at: _printk+0xc7/0x100 kernel/printk/printk.c:2475
 #4: ffffffff8e5aec50 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:336 [inline]
 #4: ffffffff8e5aec50 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:319 [inline]
 #4: ffffffff8e5aec50 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:288 [inline]
 #4: ffffffff8e5aec50 (console_srcu){....}-{0:0}, at: console_flush_all+0x158/0xc60 kernel/printk/printk.c:3203

stack backtrace:
CPU: 0 UID: 0 PID: 21564 Comm: syz.1.3081 Not tainted 6.16.0-syzkaller-12187-g0227b49b5027 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2043
 check_noncircular+0x14c/0x170 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 kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
 console_lock_spinning_enable+0xb0/0xd0 kernel/printk/printk.c:1924
 console_emit_next_record kernel/printk/printk.c:3132 [inline]
 console_flush_all+0x7aa/0xc60 kernel/printk/printk.c:3226
 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
 console_unlock+0xd8/0x210 kernel/printk/printk.c:3325
 vprintk_emit+0x418/0x6d0 kernel/printk/printk.c:2450
 _printk+0xc7/0x100 kernel/printk/printk.c:2475
 fail_dump lib/fault-inject.c:66 [inline]
 should_fail_ex+0x4e7/0x640 lib/fault-inject.c:174
 strncpy_from_user+0x3b/0x2e0 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:192
 bpf_trace_copy_string kernel/bpf/helpers.c:761 [inline]
 bpf_bprintf_prepare+0xe90/0x13f0 kernel/bpf/helpers.c:976
 ____bpf_trace_printk kernel/trace/bpf_trace.c:373 [inline]
 bpf_trace_printk+0xda/0x190 kernel/trace/bpf_trace.c:363
 bpf_prog_7c77c7e0f6645ad8+0x3e/0x44
 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+0x236/0x590 kernel/trace/bpf_trace.c:2298
 __bpf_trace_contention_begin+0xc9/0x110 include/trace/events/lock.h:95
 __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_contention_begin include/trace/events/lock.h:95 [inline]
 trace_contention_begin.constprop.0+0xde/0x160 include/trace/events/lock.h:95
 __pv_queued_spin_lock_slowpath+0x109/0xcf0 kernel/locking/qspinlock.c:219
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:557 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x20e/0x2b0 kernel/locking/spinlock_debug.c:116
 raw_spin_rq_lock_nested kernel/sched/core.c:644 [inline]
 raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:629
 raw_spin_rq_lock kernel/sched/sched.h:1519 [inline]
 rq_lock kernel/sched/sched.h:1841 [inline]
 __schedule+0x307/0x5de0 kernel/sched/core.c:6865
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288
 irqentry_exit+0x36/0x90 kernel/entry/common.c:197
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:56 [inline]
RIP: 0010:__unwind_start+0x48c/0x7f0 arch/x86/kernel/unwind_orc.c:756
Code: 48 c1 e8 03 0f b6 04 28 84 c0 74 08 3c 03 0f 8e 14 02 00 00 41 8b 06 85 c0 0f 84 56 fe ff ff 41 80 7d 00 00 0f 85 24 02 00 00 <41> 80 3c 24 00 49 8b 46 08 0f 85 fc 01 00 00 49 8b 56 10 48 39 c3
RSP: 0018:ffffc9000c79f738 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffc9000c79f818 RCX: ffffc9000c79f68c
RDX: 0000000000000000 RSI: ffffffff8de29b40 RDI: ffff8880763e4cc4
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 00000000000061ed R12: fffff520018f3ef3
R13: fffff520018f3ef2 R14: ffffc9000c79f788 R15: ffffc9000c79f790
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0x73/0x100 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4365 [inline]
 __kmalloc_noprof+0x223/0x510 mm/slub.c:4377
 kmalloc_noprof include/linux/slab.h:909 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 tomoyo_encode2+0x100/0x3e0 security/tomoyo/realpath.c:45
 tomoyo_encode+0x29/0x50 security/tomoyo/realpath.c:80
 tomoyo_realpath_from_path+0x18f/0x6e0 security/tomoyo/realpath.c:283
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_number_perm+0x245/0x580 security/tomoyo/file.c:723
 security_file_ioctl+0x9b/0x240 security/security.c:2943
 __do_sys_ioctl fs/ioctl.c:592 [inline]
 __se_sys_ioctl fs/ioctl.c:584 [inline]
 __x64_sys_ioctl+0xb7/0x210 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0cb298ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0cb0bf6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0cb2bb6180 RCX: 00007f0cb298ebe9
RDX: 0000200000000180 RSI: 00000000c028aa05 RDI: 0000000000000007
RBP: 00007f0cb0bf6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f0cb2bb6218 R14: 00007f0cb2bb6180 R15: 00007fffc1fd50b8
 </TASK>
CPU: 0 UID: 0 PID: 21564 Comm: syz.1.3081 Not tainted 6.16.0-syzkaller-12187-g0227b49b5027 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 fail_dump lib/fault-inject.c:73 [inline]
 should_fail_ex+0x512/0x640 lib/fault-inject.c:174
 strncpy_from_user+0x3b/0x2e0 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:192
 bpf_trace_copy_string kernel/bpf/helpers.c:761 [inline]
 bpf_bprintf_prepare+0xe90/0x13f0 kernel/bpf/helpers.c:976
 ____bpf_trace_printk kernel/trace/bpf_trace.c:373 [inline]
 bpf_trace_printk+0xda/0x190 kernel/trace/bpf_trace.c:363
 bpf_prog_7c77c7e0f6645ad8+0x3e/0x44
 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+0x236/0x590 kernel/trace/bpf_trace.c:2298
 __bpf_trace_contention_begin+0xc9/0x110 include/trace/events/lock.h:95
 __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_contention_begin include/trace/events/lock.h:95 [inline]
 trace_contention_begin.constprop.0+0xde/0x160 include/trace/events/lock.h:95
 __pv_queued_spin_lock_slowpath+0x109/0xcf0 kernel/locking/qspinlock.c:219
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:557 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x20e/0x2b0 kernel/locking/spinlock_debug.c:116
 raw_spin_rq_lock_nested kernel/sched/core.c:644 [inline]
 raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:629
 raw_spin_rq_lock kernel/sched/sched.h:1519 [inline]
 rq_lock kernel/sched/sched.h:1841 [inline]
 __schedule+0x307/0x5de0 kernel/sched/core.c:6865
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288
 irqentry_exit+0x36/0x90 kernel/entry/common.c:197
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:56 [inline]
RIP: 0010:__unwind_start+0x48c/0x7f0 arch/x86/kernel/unwind_orc.c:756
Code: 48 c1 e8 03 0f b6 04 28 84 c0 74 08 3c 03 0f 8e 14 02 00 00 41 8b 06 85 c0 0f 84 56 fe ff ff 41 80 7d 00 00 0f 85 24 02 00 00 <41> 80 3c 24 00 49 8b 46 08 0f 85 fc 01 00 00 49 8b 56 10 48 39 c3
RSP: 0018:ffffc9000c79f738 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffc9000c79f818 RCX: ffffc9000c79f68c
RDX: 0000000000000000 RSI: ffffffff8de29b40 RDI: ffff8880763e4cc4
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 00000000000061ed R12: fffff520018f3ef3
R13: fffff520018f3ef2 R14: ffffc9000c79f788 R15: ffffc9000c79f790
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0x73/0x100 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4365 [inline]
 __kmalloc_noprof+0x223/0x510 mm/slub.c:4377
 kmalloc_noprof include/linux/slab.h:909 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 tomoyo_encode2+0x100/0x3e0 security/tomoyo/realpath.c:45
 tomoyo_encode+0x29/0x50 security/tomoyo/realpath.c:80
 tomoyo_realpath_from_path+0x18f/0x6e0 security/tomoyo/realpath.c:283
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_number_perm+0x245/0x580 security/tomoyo/file.c:723
 security_file_ioctl+0x9b/0x240 security/security.c:2943
 __do_sys_ioctl fs/ioctl.c:592 [inline]
 __se_sys_ioctl fs/ioctl.c:584 [inline]
 __x64_sys_ioctl+0xb7/0x210 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0cb298ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0cb0bf6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0cb2bb6180 RCX: 00007f0cb298ebe9
RDX: 0000200000000180 RSI: 00000000c028aa05 RDI: 0000000000000007
RBP: 00007f0cb0bf6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f0cb2bb6218 R14: 00007f0cb2bb6180 R15: 00007fffc1fd50b8
 </TASK>
----------------
Code disassembly (best guess):
   0:	48 c1 e8 03          	shr    $0x3,%rax
   4:	0f b6 04 28          	movzbl (%rax,%rbp,1),%eax
   8:	84 c0                	test   %al,%al
   a:	74 08                	je     0x14
   c:	3c 03                	cmp    $0x3,%al
   e:	0f 8e 14 02 00 00    	jle    0x228
  14:	41 8b 06             	mov    (%r14),%eax
  17:	85 c0                	test   %eax,%eax
  19:	0f 84 56 fe ff ff    	je     0xfffffe75
  1f:	41 80 7d 00 00       	cmpb   $0x0,0x0(%r13)
  24:	0f 85 24 02 00 00    	jne    0x24e
* 2a:	41 80 3c 24 00       	cmpb   $0x0,(%r12) <-- trapping instruction
  2f:	49 8b 46 08          	mov    0x8(%r14),%rax
  33:	0f 85 fc 01 00 00    	jne    0x235
  39:	49 8b 56 10          	mov    0x10(%r14),%rdx
  3d:	48 39 c3             	cmp    %rax,%rbx