FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
6.1.131-syzkaller #0 Not tainted
------------------------------------------------------
syz.3.273/5559 is trying to acquire lock:
ffffffff8d20a578 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:139
but task is already holding lock:
ffff8880b8e3a9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&rq->__lock){-.-.}-{2:2}:
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
_raw_spin_lock_nested+0x2d/0x40 kernel/locking/spinlock.c:378
raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
raw_spin_rq_lock kernel/sched/sched.h:1355 [inline]
rq_lock kernel/sched/sched.h:1645 [inline]
task_fork_fair+0x5d/0x350 kernel/sched/fair.c:11888
sched_cgroup_fork+0x374/0x400 kernel/sched/core.c:4684
copy_process+0x2482/0x40a0 kernel/fork.c:2383
kernel_clone+0x222/0x920 kernel/fork.c:2681
user_mode_thread+0x140/0x1b0 kernel/fork.c:2757
rest_init+0x23/0x300 init/main.c:698
start_kernel+0x0/0x53f init/main.c:893
start_kernel+0x496/0x53f init/main.c:1140
secondary_startup_64_no_verify+0xcf/0xdb
-> #1 (&p->pi_lock){-.-.}-{2:2}:
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
try_to_wake_up+0xad/0x1250 kernel/sched/core.c:4110
up+0x6e/0x90 kernel/locking/semaphore.c:191
__up_console_sem+0x11a/0x1e0 kernel/printk/printk.c:260
__console_unlock kernel/printk/printk.c:2697 [inline]
console_unlock+0x591/0x7c0 kernel/printk/printk.c:2908
vprintk_emit+0x523/0x740 kernel/printk/printk.c:2303
_printk+0xd1/0x111 kernel/printk/printk.c:2328
bt_err+0x123/0x170 net/bluetooth/lib.c:251
hci_cmd_timeout+0xd9/0x1e0 net/bluetooth/hci_core.c:1457
process_one_work+0x917/0x1260 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
-> #0 ((console_sem).lock){-...}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
__lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:139
__down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:243
console_trylock kernel/printk/printk.c:2650 [inline]
console_trylock_spinning kernel/printk/printk.c:1896 [inline]
vprintk_emit+0x1ee/0x740 kernel/printk/printk.c:2302
_printk+0xd1/0x111 kernel/printk/printk.c:2328
fail_dump lib/fault-inject.c:45 [inline]
should_fail_ex+0x387/0x4d0 lib/fault-inject.c:147
strncpy_from_user+0x32/0x360 lib/strncpy_from_user.c:118
strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:186
bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:204 [inline]
____bpf_probe_read_user_str kernel/trace/bpf_trace.c:213 [inline]
bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:210
bpf_prog_bc7c5c6b9645592f+0x35/0x37
bpf_dispatcher_nop_func include/linux/bpf.h:1000 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
bpf_trace_run4+0x253/0x470 kernel/trace/bpf_trace.c:2325
__traceiter_sched_switch+0x91/0xc0 include/trace/events/sched.h:222
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x2128/0x4570 kernel/sched/core.c:6557
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6872
irqentry_exit+0x53/0x80 kernel/entry/common.c:439
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
arch_atomic64_dec_and_test arch/x86/include/asm/atomic64_64.h:118 [inline]
arch_atomic_long_dec_and_test include/linux/atomic/atomic-long.h:467 [inline]
atomic_long_dec_and_test include/linux/atomic/atomic-instrumented.h:1814 [inline]
fput+0x25/0x1b0 fs/file_table.c:371
fdput include/linux/file.h:46 [inline]
fdput_pos include/linux/file.h:81 [inline]
ksys_write+0x263/0x2c0 fs/read_write.c:640
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/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_sem).lock --> &p->pi_lock --> &rq->__lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&rq->__lock);
lock(&p->pi_lock);
lock(&rq->__lock);
lock((console_sem).lock);
*** DEADLOCK ***
2 locks held by syz.3.273/5559:
#0: ffff8880b8e3a9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
#1: ffffffff8d32e6c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#1: ffffffff8d32e6c0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#1: ffffffff8d32e6c0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline]
#1: ffffffff8d32e6c0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x16a/0x470 kernel/trace/bpf_trace.c:2325
stack backtrace:
CPU: 0 PID: 5559 Comm: syz.3.273 Not tainted 6.1.131-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
__lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:139
__down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:243
console_trylock kernel/printk/printk.c:2650 [inline]
console_trylock_spinning kernel/printk/printk.c:1896 [inline]
vprintk_emit+0x1ee/0x740 kernel/printk/printk.c:2302
_printk+0xd1/0x111 kernel/printk/printk.c:2328
fail_dump lib/fault-inject.c:45 [inline]
should_fail_ex+0x387/0x4d0 lib/fault-inject.c:147
strncpy_from_user+0x32/0x360 lib/strncpy_from_user.c:118
strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:186
bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:204 [inline]
____bpf_probe_read_user_str kernel/trace/bpf_trace.c:213 [inline]
bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:210
bpf_prog_bc7c5c6b9645592f+0x35/0x37
bpf_dispatcher_nop_func include/linux/bpf.h:1000 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
bpf_trace_run4+0x253/0x470 kernel/trace/bpf_trace.c:2325
__traceiter_sched_switch+0x91/0xc0 include/trace/events/sched.h:222
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x2128/0x4570 kernel/sched/core.c:6557
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6872
irqentry_exit+0x53/0x80 kernel/entry/common.c:439
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:arch_atomic64_dec_and_test arch/x86/include/asm/atomic64_64.h:118 [inline]
RIP: 0010:arch_atomic_long_dec_and_test include/linux/atomic/atomic-long.h:467 [inline]
RIP: 0010:atomic_long_dec_and_test include/linux/atomic/atomic-instrumented.h:1814 [inline]
RIP: 0010:fput+0x25/0x1b0 fs/file_table.c:371
Code: 00 00 00 00 00 55 41 57 41 56 41 54 53 49 89 ff e8 80 42 99 ff 49 8d 7f 70 be 08 00 00 00 e8 52 a5 f0 ff 31 db f0 49 ff 4f 70 <40> 0f 94 c5 0f 94 c3 bf 02 00 00 00 89 de e8 b8 44 99 ff 31 ff 89
RSP: 0018:ffffc90005277e10 EFLAGS: 00000202
RAX: ffffffff81f16701 RBX: 0000000000000000 RCX: ffffffff81f1674e
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888067e5f470
RBP: ffffc90005277f20 R08: dffffc0000000000 R09: ffffed100cfcbe8f
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001
R13: 1ffff92000a4efd0 R14: ffff888067e5f403 R15: ffff888067e5f400
fdput include/linux/file.h:46 [inline]
fdput_pos include/linux/file.h:81 [inline]
ksys_write+0x263/0x2c0 fs/read_write.c:640
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3dacd8bc1f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f3dadb02030 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f3dacd8bc1f
RDX: 0000000000000001 RSI: 00007f3dadb02090 RDI: 000000000000000b
RBP: 00007f3dadb02090 R08: 0000000000000000 R09: 00007f3dadb01df7
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f3dacfa6160 R15: 00007fff0c0750e8
CPU: 0 PID: 5559 Comm: syz.3.273 Not tainted 6.1.131-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
fail_dump lib/fault-inject.c:52 [inline]
should_fail_ex+0x3a6/0x4d0 lib/fault-inject.c:147
strncpy_from_user+0x32/0x360 lib/strncpy_from_user.c:118
strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:186
bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:204 [inline]
____bpf_probe_read_user_str kernel/trace/bpf_trace.c:213 [inline]
bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:210
bpf_prog_bc7c5c6b9645592f+0x35/0x37
bpf_dispatcher_nop_func include/linux/bpf.h:1000 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
bpf_trace_run4+0x253/0x470 kernel/trace/bpf_trace.c:2325
__traceiter_sched_switch+0x91/0xc0 include/trace/events/sched.h:222
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x2128/0x4570 kernel/sched/core.c:6557
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6872
irqentry_exit+0x53/0x80 kernel/entry/common.c:439
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:arch_atomic64_dec_and_test arch/x86/include/asm/atomic64_64.h:118 [inline]
RIP: 0010:arch_atomic_long_dec_and_test include/linux/atomic/atomic-long.h:467 [inline]
RIP: 0010:atomic_long_dec_and_test include/linux/atomic/atomic-instrumented.h:1814 [inline]
RIP: 0010:fput+0x25/0x1b0 fs/file_table.c:371
Code: 00 00 00 00 00 55 41 57 41 56 41 54 53 49 89 ff e8 80 42 99 ff 49 8d 7f 70 be 08 00 00 00 e8 52 a5 f0 ff 31 db f0 49 ff 4f 70 <40> 0f 94 c5 0f 94 c3 bf 02 00 00 00 89 de e8 b8 44 99 ff 31 ff 89
RSP: 0018:ffffc90005277e10 EFLAGS: 00000202
RAX: ffffffff81f16701 RBX: 0000000000000000 RCX: ffffffff81f1674e
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888067e5f470
RBP: ffffc90005277f20 R08: dffffc0000000000 R09: ffffed100cfcbe8f
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001
R13: 1ffff92000a4efd0 R14: ffff888067e5f403 R15: ffff888067e5f400
fdput include/linux/file.h:46 [inline]
fdput_pos include/linux/file.h:81 [inline]
ksys_write+0x263/0x2c0 fs/read_write.c:640
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3dacd8bc1f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f3dadb02030 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f3dacd8bc1f
RDX: 0000000000000001 RSI: 00007f3dadb02090 RDI: 000000000000000b
RBP: 00007f3dadb02090 R08: 0000000000000000 R09: 00007f3dadb01df7
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f3dacfa6160 R15: 00007fff0c0750e8
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 00 add %al,(%rax)
4: 00 55 41 add %dl,0x41(%rbp)
7: 57 push %rdi
8: 41 56 push %r14
a: 41 54 push %r12
c: 53 push %rbx
d: 49 89 ff mov %rdi,%r15
10: e8 80 42 99 ff call 0xff994295
15: 49 8d 7f 70 lea 0x70(%r15),%rdi
19: be 08 00 00 00 mov $0x8,%esi
1e: e8 52 a5 f0 ff call 0xfff0a575
23: 31 db xor %ebx,%ebx
25: f0 49 ff 4f 70 lock decq 0x70(%r15)
* 2a: 40 0f 94 c5 sete %bpl <-- trapping instruction
2e: 0f 94 c3 sete %bl
31: bf 02 00 00 00 mov $0x2,%edi
36: 89 de mov %ebx,%esi
38: e8 b8 44 99 ff call 0xff9944f5
3d: 31 ff xor %edi,%edi
3f: 89 .byte 0x89