FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc6-syzkaller-00115-ge3a854b577cb #0 Not tainted
------------------------------------------------------
syz.0.315/7252 is trying to acquire lock:
ffffffff8e1aaeb8 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0x12/0x70 kernel/locking/semaphore.c:139
but task is already holding lock:
ffff88802b63ed58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:606 [inline]
ffff88802b63ed58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:591
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&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:598
raw_spin_rq_lock kernel/sched/sched.h:1521 [inline]
task_rq_lock+0xcf/0x3b0 kernel/sched/core.c:700
cgroup_move_task+0x82/0x250 kernel/sched/psi.c:1161
css_set_move_task+0x288/0x5f0 kernel/cgroup/cgroup.c:898
cgroup_post_fork+0x202/0x9d0 kernel/cgroup/cgroup.c:6695
copy_process+0x4ffd/0x8c50 kernel/fork.c:2629
kernel_clone+0xfd/0x960 kernel/fork.c:2815
user_mode_thread+0xc9/0x110 kernel/fork.c:2893
rest_init+0x23/0x2b0 init/main.c:708
start_kernel+0x3e9/0x4d0 init/main.c:1099
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:515
x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:496
common_startup_64+0x13e/0x148
-> #1 (&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:551 [inline]
try_to_wake_up+0xb6/0x1490 kernel/sched/core.c:4214
up+0x79/0xb0 kernel/locking/semaphore.c:191
__up_console_sem+0x85/0xe0 kernel/printk/printk.c:343
__console_unlock kernel/printk/printk.c:2869 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3271 [inline]
console_unlock+0x1dc/0x210 kernel/printk/printk.c:3309
vga_remove_vgacon drivers/pci/vgaarb.c:186 [inline]
vga_remove_vgacon+0x90/0xd0 drivers/pci/vgaarb.c:167
__aperture_remove_legacy_vga_devices drivers/video/aperture.c:331 [inline]
aperture_remove_conflicting_pci_devices+0x16a/0x1e0 drivers/video/aperture.c:369
bochs_pci_probe+0x29/0xcd0 drivers/gpu/drm/tiny/bochs.c:723
local_pci_probe+0xde/0x1b0 drivers/pci/pci-driver.c:324
pci_call_probe drivers/pci/pci-driver.c:392 [inline]
__pci_device_probe drivers/pci/pci-driver.c:417 [inline]
pci_device_probe+0x673/0x7a0 drivers/pci/pci-driver.c:451
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:658
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:800
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830
__driver_attach+0x283/0x580 drivers/base/dd.c:1216
bus_for_each_dev+0x13c/0x1d0 drivers/base/bus.c:370
bus_add_driver+0x2e9/0x690 drivers/base/bus.c:678
driver_register+0x15c/0x4b0 drivers/base/driver.c:249
drm_pci_register_driver_if_modeset include/drm/drm_module.h:69 [inline]
bochs_pci_driver_init+0x67/0x80 drivers/gpu/drm/tiny/bochs.c:805
do_one_initcall+0x128/0x700 init/main.c:1257
do_initcall_level init/main.c:1319 [inline]
do_initcalls init/main.c:1335 [inline]
do_basic_setup init/main.c:1354 [inline]
kernel_init_freeable+0x5c7/0x900 init/main.c:1568
kernel_init+0x1c/0x2b0 init/main.c:1457
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #0 ((console_sem).lock){-...}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain kernel/locking/lockdep.c:3906 [inline]
__lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
down_trylock+0x12/0x70 kernel/locking/semaphore.c:139
__down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:326
console_trylock kernel/printk/printk.c:2852 [inline]
console_trylock_spinning kernel/printk/printk.c:2009 [inline]
vprintk_emit+0x3ec/0x6f0 kernel/printk/printk.c:2431
_printk+0xc8/0x100 kernel/printk/printk.c:2457
fail_dump lib/fault-inject.c:66 [inline]
should_fail_ex+0x4df/0x650 lib/fault-inject.c:174
strncpy_from_user+0x3b/0x2d0 lib/strncpy_from_user.c:118
strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:193
bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline]
____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:310 [inline]
bpf_probe_read_compat_str+0xf1/0x170 kernel/trace/bpf_trace.c:306
bpf_prog_c1796171ffc7efef+0x3e/0x40
bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
__bpf_prog_run include/linux/filter.h:701 [inline]
bpf_prog_run include/linux/filter.h:708 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2371 [inline]
bpf_trace_run4+0x245/0x5a0 kernel/trace/bpf_trace.c:2414
__bpf_trace_sched_switch+0x13e/0x190 include/trace/events/sched.h:222
__traceiter_sched_switch+0x6c/0xc0 include/trace/events/sched.h:222
__do_trace_sched_switch include/trace/events/sched.h:222 [inline]
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x160c/0x5890 kernel/sched/core.c:6762
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7087
irqentry_exit+0x36/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
stack_trace_consume_entry+0x81/0x170 kernel/stacktrace.c:89
arch_stack_walk+0x86/0x100 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:319 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4115 [inline]
kmem_cache_alloc_bulk_noprof+0x3e9/0xb10 mm/slub.c:5125
__io_alloc_req_refill+0x9d/0x5b0 io_uring/io_uring.c:965
io_alloc_req io_uring/io_uring.h:435 [inline]
io_submit_sqes+0xe35/0x2670 io_uring/io_uring.c:2310
__do_sys_io_uring_enter+0xd60/0x1670 io_uring/io_uring.c:3372
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:387
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:412
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
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 ***
3 locks held by syz.0.315/7252:
#0: ffff88805a84a0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: __do_sys_io_uring_enter+0xd55/0x1670 io_uring/io_uring.c:3371
#1: ffff88802b63ed58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:606 [inline]
#1: ffff88802b63ed58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:591
#2: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#2: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#2: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2370 [inline]
#2: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run4+0x1d6/0x5a0 kernel/trace/bpf_trace.c:2414
stack backtrace:
CPU: 3 UID: 0 PID: 7252 Comm: syz.0.315 Not tainted 6.14.0-rc6-syzkaller-00115-ge3a854b577cb #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_circular_bug+0x490/0x760 kernel/locking/lockdep.c:2076
check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2208
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain kernel/locking/lockdep.c:3906 [inline]
__lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
down_trylock+0x12/0x70 kernel/locking/semaphore.c:139
__down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:326
console_trylock kernel/printk/printk.c:2852 [inline]
console_trylock_spinning kernel/printk/printk.c:2009 [inline]
vprintk_emit+0x3ec/0x6f0 kernel/printk/printk.c:2431
_printk+0xc8/0x100 kernel/printk/printk.c:2457
fail_dump lib/fault-inject.c:66 [inline]
should_fail_ex+0x4df/0x650 lib/fault-inject.c:174
strncpy_from_user+0x3b/0x2d0 lib/strncpy_from_user.c:118
strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:193
bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline]
____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:310 [inline]
bpf_probe_read_compat_str+0xf1/0x170 kernel/trace/bpf_trace.c:306
bpf_prog_c1796171ffc7efef+0x3e/0x40
bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
__bpf_prog_run include/linux/filter.h:701 [inline]
bpf_prog_run include/linux/filter.h:708 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2371 [inline]
bpf_trace_run4+0x245/0x5a0 kernel/trace/bpf_trace.c:2414
__bpf_trace_sched_switch+0x13e/0x190 include/trace/events/sched.h:222
__traceiter_sched_switch+0x6c/0xc0 include/trace/events/sched.h:222
__do_trace_sched_switch include/trace/events/sched.h:222 [inline]
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x160c/0x5890 kernel/sched/core.c:6762
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7087
irqentry_exit+0x36/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:stack_trace_consume_entry+0x81/0x170 kernel/stacktrace.c:89
Code: 00 00 00 31 c0 3b 6b 08 0f 83 81 00 00 00 48 8d 7b 0c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 <83> e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 98 00 00 00 8b 43 0c 85
RSP: 0018:ffffc90003ae7778 EFLAGS: 00000a07
RAX: ffffc90003ae7864 RBX: ffffc90003ae7858 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff84b870c0 RDI: ffffc90003ae7864
RBP: 0000000000000006 R08: ffffc90003ae77cc R09: ffffffff91314642
R10: ffffc90003ae7798 R11: 000000000003b84b R12: ffffffff81a5abb0
R13: ffffc90003ae7858 R14: 0000000000000000 R15: ffff888024c08000
arch_stack_walk+0x86/0x100 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:319 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4115 [inline]
kmem_cache_alloc_bulk_noprof+0x3e9/0xb10 mm/slub.c:5125
__io_alloc_req_refill+0x9d/0x5b0 io_uring/io_uring.c:965
io_alloc_req io_uring/io_uring.h:435 [inline]
io_submit_sqes+0xe35/0x2670 io_uring/io_uring.c:2310
__do_sys_io_uring_enter+0xd60/0x1670 io_uring/io_uring.c:3372
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:387
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:412
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fb4579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50b555c EFLAGS: 00000296 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000003516
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
CPU: 3 UID: 0 PID: 7252 Comm: syz.0.315 Not tainted 6.14.0-rc6-syzkaller-00115-ge3a854b577cb #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
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+0x50a/0x650 lib/fault-inject.c:174
strncpy_from_user+0x3b/0x2d0 lib/strncpy_from_user.c:118
strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:193
bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline]
____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:310 [inline]
bpf_probe_read_compat_str+0xf1/0x170 kernel/trace/bpf_trace.c:306
bpf_prog_c1796171ffc7efef+0x3e/0x40
bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
__bpf_prog_run include/linux/filter.h:701 [inline]
bpf_prog_run include/linux/filter.h:708 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2371 [inline]
bpf_trace_run4+0x245/0x5a0 kernel/trace/bpf_trace.c:2414
__bpf_trace_sched_switch+0x13e/0x190 include/trace/events/sched.h:222
__traceiter_sched_switch+0x6c/0xc0 include/trace/events/sched.h:222
__do_trace_sched_switch include/trace/events/sched.h:222 [inline]
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x160c/0x5890 kernel/sched/core.c:6762
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7087
irqentry_exit+0x36/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:stack_trace_consume_entry+0x81/0x170 kernel/stacktrace.c:89
Code: 00 00 00 31 c0 3b 6b 08 0f 83 81 00 00 00 48 8d 7b 0c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 <83> e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 98 00 00 00 8b 43 0c 85
RSP: 0018:ffffc90003ae7778 EFLAGS: 00000a07
RAX: ffffc90003ae7864 RBX: ffffc90003ae7858 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff84b870c0 RDI: ffffc90003ae7864
RBP: 0000000000000006 R08: ffffc90003ae77cc R09: ffffffff91314642
R10: ffffc90003ae7798 R11: 000000000003b84b R12: ffffffff81a5abb0
R13: ffffc90003ae7858 R14: 0000000000000000 R15: ffff888024c08000
arch_stack_walk+0x86/0x100 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:319 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4115 [inline]
kmem_cache_alloc_bulk_noprof+0x3e9/0xb10 mm/slub.c:5125
__io_alloc_req_refill+0x9d/0x5b0 io_uring/io_uring.c:965
io_alloc_req io_uring/io_uring.h:435 [inline]
io_submit_sqes+0xe35/0x2670 io_uring/io_uring.c:2310
__do_sys_io_uring_enter+0xd60/0x1670 io_uring/io_uring.c:3372
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:387
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:412
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fb4579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50b555c EFLAGS: 00000296 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000003516
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 31 add %dh,(%rcx)
4: c0 3b 6b sarb $0x6b,(%rbx)
7: 08 0f or %cl,(%rdi)
9: 83 81 00 00 00 48 8d addl $0xffffff8d,0x48000000(%rcx)
10: 7b 0c jnp 0x1e
12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
19: fc ff df
1c: 48 89 fa mov %rdi,%rdx
1f: 48 c1 ea 03 shr $0x3,%rdx
23: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx
27: 48 89 f8 mov %rdi,%rax
* 2a: 83 e0 07 and $0x7,%eax <-- trapping instruction
2d: 83 c0 03 add $0x3,%eax
30: 38 d0 cmp %dl,%al
32: 7c 08 jl 0x3c
34: 84 d2 test %dl,%dl
36: 0f 85 98 00 00 00 jne 0xd4
3c: 8b 43 0c mov 0xc(%rbx),%eax
3f: 85 .byte 0x85