sctp: [Deprecated]: syz.1.585 (pid 7623) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
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.1.585/7623 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:
ffff8880b8f3c458 (&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:

-> #4 (&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

-> #3 (&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
       __wake_up_common+0x2a4/0x4e0 kernel/sched/wait.c:107
       __wake_up_common_lock kernel/sched/wait.c:138 [inline]
       __wake_up+0x112/0x190 kernel/sched/wait.c:160
       tty_port_default_wakeup+0xa2/0xf0 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x6bd/0x8a0 drivers/tty/serial/8250/8250_port.c:1837
       serial8250_handle_irq+0x534/0x6e0 drivers/tty/serial/8250/8250_port.c:1944
       serial8250_default_handle_irq+0xb8/0x1a0 drivers/tty/serial/8250/8250_port.c:1964
       serial8250_interrupt+0x9f/0x1c0 drivers/tty/serial/8250/8250_core.c:127
       __handle_irq_event_percpu+0x276/0x930 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0x8b/0x1e0 kernel/irq/handle.c:210
       handle_edge_irq+0x247/0xb30 kernel/irq/chip.c:831
       generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
       handle_irq arch/x86/kernel/irq.c:240 [inline]
       __common_interrupt+0x13b/0x230 arch/x86/kernel/irq.c:259
       common_interrupt+0xb4/0xd0 arch/x86/kernel/irq.c:249
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:678
       debug_check_no_locks_freed+0x21a/0x3c0 kernel/locking/lockdep.c:6594
       slab_free_hook mm/slub.c:1778 [inline]
       slab_free_freelist_hook+0xc1/0x1b0 mm/slub.c:1832
       slab_free mm/slub.c:3816 [inline]
       kmem_cache_free+0xf8/0x280 mm/slub.c:3838
       anon_vma_free mm/rmap.c:137 [inline]
       __put_anon_vma+0x12b/0x2d0 mm/rmap.c:2365
       put_anon_vma include/linux/rmap.h:116 [inline]
       unlink_anon_vmas+0x501/0x660 mm/rmap.c:445
       free_pgtables+0x4ff/0x770 mm/memory.c:399
       exit_mmap+0x3e8/0xb50 mm/mmap.c:3309
       __mmput+0x118/0x3c0 kernel/fork.c:1355
       exec_mmap+0x584/0x640 fs/exec.c:1036
       begin_new_exec+0xa2e/0x1eb0 fs/exec.c:1294
       load_elf_binary+0x9a0/0x2700 fs/binfmt_elf.c:1027
       search_binary_handler fs/exec.c:1775 [inline]
       exec_binprm fs/exec.c:1817 [inline]
       bprm_execve+0xaeb/0x16f0 fs/exec.c:1892
       do_execveat_common+0x51b/0x6c0 fs/exec.c:1998
       do_execve fs/exec.c:2072 [inline]
       __do_sys_execve fs/exec.c:2148 [inline]
       __se_sys_execve fs/exec.c:2143 [inline]
       __x64_sys_execve+0x92/0xa0 fs/exec.c:2143
       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

-> #2 (&tty->write_wait){-.-.}-{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
       __wake_up_common_lock kernel/sched/wait.c:137 [inline]
       __wake_up+0xf8/0x190 kernel/sched/wait.c:160
       tty_port_default_wakeup+0xa2/0xf0 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x6bd/0x8a0 drivers/tty/serial/8250/8250_port.c:1837
       serial8250_handle_irq+0x534/0x6e0 drivers/tty/serial/8250/8250_port.c:1944
       serial8250_default_handle_irq+0xb8/0x1a0 drivers/tty/serial/8250/8250_port.c:1964
       serial8250_interrupt+0x9f/0x1c0 drivers/tty/serial/8250/8250_core.c:127
       __handle_irq_event_percpu+0x276/0x930 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0x8b/0x1e0 kernel/irq/handle.c:210
       handle_edge_irq+0x247/0xb30 kernel/irq/chip.c:831
       generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
       handle_irq arch/x86/kernel/irq.c:240 [inline]
       __common_interrupt+0x13b/0x230 arch/x86/kernel/irq.c:259
       common_interrupt+0xb4/0xd0 arch/x86/kernel/irq.c:249
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:678
       native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
       pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:147
       arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
       default_idle+0x13/0x20 arch/x86/kernel/process.c:753
       default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97
       cpuidle_idle_call kernel/sched/idle.c:170 [inline]
       do_idle+0x1eb/0x510 kernel/sched/idle.c:282
       cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:380
       rest_init+0x2e2/0x300 init/main.c:732
       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

-> #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_compat_str kernel/trace/bpf_trace.c:307 [inline]
       bpf_probe_read_compat_str+0xe1/0x170 kernel/trace/bpf_trace.c:303
       bpf_prog_88d57d73ead2a882+0x45/0x47
       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_common+0x82/0xc0 kernel/sched/core.c:6867
       preempt_schedule+0xab/0xc0 kernel/sched/core.c:6891
       preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
       vprintk_emit+0x578/0x600 kernel/printk/printk.c:2342
       _printk+0xd0/0x110 kernel/printk/printk.c:2366
       sctp_setsockopt_delayed_ack+0x1de/0x280 net/sctp/socket.c:2839
       sctp_setsockopt+0xa02/0x11e0 net/sctp/socket.c:4642
       do_sock_setsockopt+0x175/0x1a0 net/socket.c:2322
       __sys_setsockopt net/socket.c:2345 [inline]
       __do_sys_setsockopt net/socket.c:2354 [inline]
       __se_sys_setsockopt net/socket.c:2351 [inline]
       __x64_sys_setsockopt+0x184/0x200 net/socket.c:2351
       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 ***

5 locks held by syz.1.585/7623:
 #0: ffff88802c680130 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1731 [inline]
 #0: ffff88802c680130 (sk_lock-AF_INET){+.+.}-{0:0}, at: sctp_setsockopt+0x1f6/0x11e0 net/sctp/socket.c:4600
 #1: ffff8880b8f3c458 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558
 #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: __bpf_trace_run kernel/trace/bpf_trace.c:2321 [inline]
 #2: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xde/0x3c0 kernel/trace/bpf_trace.c:2361
 #3: ffffffff8cd23ee0 (console_lock){+.+.}-{0:0}, at: _printk+0xd0/0x110 kernel/printk/printk.c:2366
 #4: ffffffff8cc0b6f0 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:339 [inline]
 #4: ffffffff8cc0b6f0 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline]
 #4: ffffffff8cc0b6f0 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:292 [inline]
 #4: ffffffff8cc0b6f0 (console_srcu){....}-{0:0}, at: console_flush_all+0x10f/0xd00 kernel/printk/printk.c:2992

stack backtrace:
CPU: 1 PID: 7623 Comm: syz.1.585 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 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_compat_str kernel/trace/bpf_trace.c:307 [inline]
 bpf_probe_read_compat_str+0xe1/0x170 kernel/trace/bpf_trace.c:303
 bpf_prog_88d57d73ead2a882+0x45/0x47
 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_common+0x82/0xc0 kernel/sched/core.c:6867
 preempt_schedule+0xab/0xc0 kernel/sched/core.c:6891
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 vprintk_emit+0x578/0x600 kernel/printk/printk.c:2342
 _printk+0xd0/0x110 kernel/printk/printk.c:2366
 sctp_setsockopt_delayed_ack+0x1de/0x280 net/sctp/socket.c:2839
 sctp_setsockopt+0xa02/0x11e0 net/sctp/socket.c:4642
 do_sock_setsockopt+0x175/0x1a0 net/socket.c:2322
 __sys_setsockopt net/socket.c:2345 [inline]
 __do_sys_setsockopt net/socket.c:2354 [inline]
 __se_sys_setsockopt net/socket.c:2351 [inline]
 __x64_sys_setsockopt+0x184/0x200 net/socket.c:2351
 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: 0033:0x7f2779f8eb69
Code: Unable to access opcode bytes at 0x7f2779f8eb3f.
RSP: 002b:00007f277ad9a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f277a1b5fa0 RCX: 00007f2779f8eb69
RDX: 0000000000000010 RSI: 0000000000000084 RDI: 0000000000000003
RBP: 00007f277ad9a090 R08: 0000000000000008 R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f277a1b5fa0 R15: 00007ffe683a2478
 </TASK>
CPU: 1 PID: 7623 Comm: syz.1.585 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 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_compat_str kernel/trace/bpf_trace.c:307 [inline]
 bpf_probe_read_compat_str+0xe1/0x170 kernel/trace/bpf_trace.c:303
 bpf_prog_88d57d73ead2a882+0x45/0x47
 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_common+0x82/0xc0 kernel/sched/core.c:6867
 preempt_schedule+0xab/0xc0 kernel/sched/core.c:6891
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 vprintk_emit+0x578/0x600 kernel/printk/printk.c:2342
 _printk+0xd0/0x110 kernel/printk/printk.c:2366
 sctp_setsockopt_delayed_ack+0x1de/0x280 net/sctp/socket.c:2839
 sctp_setsockopt+0xa02/0x11e0 net/sctp/socket.c:4642
 do_sock_setsockopt+0x175/0x1a0 net/socket.c:2322
 __sys_setsockopt net/socket.c:2345 [inline]
 __do_sys_setsockopt net/socket.c:2354 [inline]
 __se_sys_setsockopt net/socket.c:2351 [inline]
 __x64_sys_setsockopt+0x184/0x200 net/socket.c:2351
 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: 0033:0x7f2779f8eb69
Code: Unable to access opcode bytes at 0x7f2779f8eb3f.
RSP: 002b:00007f277ad9a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f277a1b5fa0 RCX: 00007f2779f8eb69
RDX: 0000000000000010 RSI: 0000000000000084 RDI: 0000000000000003
RBP: 00007f277ad9a090 R08: 0000000000000008 R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f277a1b5fa0 R15: 00007ffe683a2478
 </TASK>