========================================================
WARNING: possible irq lock inversion dependency detected
6.7.0-rc1-next-20231117-syzkaller #0 Not tainted
--------------------------------------------------------
syz-executor.2/15066 just changed the state of lock:
ffff888029730038 (&new_timer->it_lock){-...}-{2:2}, at: alarm_handle_timer+0x2d/0x2e0 kernel/time/alarmtimer.c:579
but this lock took another, HARDIRQ-unsafe lock in the past:
(&sighand->siglock){+.+.}-{2:2}
and interrupts could create inverse lock ordering between them.
other info that might help us debug this:
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sighand->siglock);
local_irq_disable();
lock(&new_timer->it_lock);
lock(&sighand->siglock);
<Interrupt>
lock(&new_timer->it_lock);
*** DEADLOCK ***
4 locks held by syz-executor.2/15066:
#0: ffff88801e2c4490 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xc9/0x290 kernel/trace/blktrace.c:736
#1: ffffffff8d01c2e8 (relay_channels_mutex){+.+.}-{3:3}, at: relay_open+0x38f/0xab0 kernel/relay.c:515
#2: ffff88801b64cb70 (&sb->s_type->i_mutex_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
#2: ffff88801b64cb70 (&sb->s_type->i_mutex_key#3){++++}-{3:3}, at: start_creating.part.0+0xb0/0x3a0 fs/debugfs/inode.c:370
#3: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
#3: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
#3: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: is_bpf_text_address+0x30/0x1a0 kernel/bpf/core.c:733
the shortest dependencies between 2nd lock and 1st lock:
-> (&sighand->siglock){+.+.}-{2:2} {
HARDIRQ-ON-W at:
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
class_spinlock_constructor include/linux/spinlock.h:530 [inline]
ptrace_set_stopped kernel/ptrace.c:391 [inline]
ptrace_attach+0x401/0x650 kernel/ptrace.c:478
__do_sys_ptrace+0x204/0x230 kernel/ptrace.c:1290
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x62/0x6a
SOFTIRQ-ON-W at:
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
class_spinlock_constructor include/linux/spinlock.h:530 [inline]
ptrace_set_stopped kernel/ptrace.c:391 [inline]
ptrace_attach+0x401/0x650 kernel/ptrace.c:478
__do_sys_ptrace+0x204/0x230 kernel/ptrace.c:1290
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x62/0x6a
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:376 [inline]
calculate_sigpending+0x44/0xa0 kernel/signal.c:197
ret_from_fork+0x23/0x80 arch/x86/kernel/process.c:143
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
}
... key at: [<ffffffff90b4af80>] __key.341+0x0/0x40
... acquired at:
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
__do_sys_timer_delete kernel/time/posix-timers.c:1023 [inline]
__se_sys_timer_delete kernel/time/posix-timers.c:1006 [inline]
__x64_sys_timer_delete+0x16a/0x3e0 kernel/time/posix-timers.c:1006
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x62/0x6a
-> (&new_timer->it_lock){-...}-{2:2} {
IN-HARDIRQ-W at:
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
alarm_handle_timer+0x2d/0x2e0 kernel/time/alarmtimer.c:579
alarmtimer_fired+0x132/0x550 kernel/time/alarmtimer.c:209
__run_hrtimer kernel/time/hrtimer.c:1688 [inline]
__hrtimer_run_queues+0x20c/0xc20 kernel/time/hrtimer.c:1752
hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
__sysvec_apic_timer_interrupt+0x10c/0x410 arch/x86/kernel/apic/apic.c:1082
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
lock_acquire+0x1f2/0x530 kernel/locking/lockdep.c:5721
rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
rcu_read_lock include/linux/rcupdate.h:747 [inline]
is_bpf_text_address+0x36/0x1a0 kernel/bpf/core.c:733
kernel_text_address kernel/extable.c:125 [inline]
kernel_text_address+0x85/0xf0 kernel/extable.c:94
__kernel_text_address+0xd/0x30 kernel/extable.c:79
unwind_get_return_address+0x78/0xe0 arch/x86/kernel/unwind_orc.c:369
arch_stack_walk+0xbe/0x170 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x24/0x30 mm/kasan/common.c:52
__kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook mm/slab.h:763 [inline]
slab_alloc_node mm/slub.c:3452 [inline]
slab_alloc mm/slub.c:3460 [inline]
__kmem_cache_alloc_lru mm/slub.c:3467 [inline]
kmem_cache_alloc_lru+0x219/0x6f0 mm/slub.c:3483
alloc_inode_sb include/linux/fs.h:2953 [inline]
alloc_inode+0xb3/0x220 fs/inode.c:261
new_inode_pseudo fs/inode.c:1004 [inline]
new_inode+0x22/0x260 fs/inode.c:1030
debugfs_get_inode fs/debugfs/inode.c:72 [inline]
__debugfs_create_file+0x11a/0x620 fs/debugfs/inode.c:429
relay_create_buf_file+0xf0/0x170 kernel/relay.c:360
relay_open_buf.part.0+0x77e/0xba0 kernel/relay.c:389
relay_open_buf kernel/relay.c:536 [inline]
relay_open+0x641/0xab0 kernel/relay.c:517
do_blk_trace_setup+0x4a9/0xaa0 kernel/trace/blktrace.c:591
__blk_trace_setup+0xd8/0x180 kernel/trace/blktrace.c:631
blk_trace_ioctl+0x163/0x290 kernel/trace/blktrace.c:741
blkdev_ioctl+0x111/0x770 block/ioctl.c:622
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x62/0x6a
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
itimer_delete kernel/time/posix-timers.c:1048 [inline]
exit_itimers+0x255/0x560 kernel/time/posix-timers.c:1109
do_exit+0x629/0x2ad0 kernel/exit.c:845
do_group_exit+0xd3/0x2a0 kernel/exit.c:1021
__do_sys_exit_group kernel/exit.c:1032 [inline]
__se_sys_exit_group kernel/exit.c:1030 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1030
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x62/0x6a
}
... key at: [<ffffffff9280bea0>] __key.0+0x0/0x40
... acquired at:
mark_usage kernel/locking/lockdep.c:4563 [inline]
__lock_acquire+0x1347/0x3b10 kernel/locking/lockdep.c:5090
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
alarm_handle_timer+0x2d/0x2e0 kernel/time/alarmtimer.c:579
alarmtimer_fired+0x132/0x550 kernel/time/alarmtimer.c:209
__run_hrtimer kernel/time/hrtimer.c:1688 [inline]
__hrtimer_run_queues+0x20c/0xc20 kernel/time/hrtimer.c:1752
hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
__sysvec_apic_timer_interrupt+0x10c/0x410 arch/x86/kernel/apic/apic.c:1082
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
lock_acquire+0x1f2/0x530 kernel/locking/lockdep.c:5721
rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
rcu_read_lock include/linux/rcupdate.h:747 [inline]
is_bpf_text_address+0x36/0x1a0 kernel/bpf/core.c:733
kernel_text_address kernel/extable.c:125 [inline]
kernel_text_address+0x85/0xf0 kernel/extable.c:94
__kernel_text_address+0xd/0x30 kernel/extable.c:79
unwind_get_return_address+0x78/0xe0 arch/x86/kernel/unwind_orc.c:369
arch_stack_walk+0xbe/0x170 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x24/0x30 mm/kasan/common.c:52
__kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook mm/slab.h:763 [inline]
slab_alloc_node mm/slub.c:3452 [inline]
slab_alloc mm/slub.c:3460 [inline]
__kmem_cache_alloc_lru mm/slub.c:3467 [inline]
kmem_cache_alloc_lru+0x219/0x6f0 mm/slub.c:3483
alloc_inode_sb include/linux/fs.h:2953 [inline]
alloc_inode+0xb3/0x220 fs/inode.c:261
new_inode_pseudo fs/inode.c:1004 [inline]
new_inode+0x22/0x260 fs/inode.c:1030
debugfs_get_inode fs/debugfs/inode.c:72 [inline]
__debugfs_create_file+0x11a/0x620 fs/debugfs/inode.c:429
relay_create_buf_file+0xf0/0x170 kernel/relay.c:360
relay_open_buf.part.0+0x77e/0xba0 kernel/relay.c:389
relay_open_buf kernel/relay.c:536 [inline]
relay_open+0x641/0xab0 kernel/relay.c:517
do_blk_trace_setup+0x4a9/0xaa0 kernel/trace/blktrace.c:591
__blk_trace_setup+0xd8/0x180 kernel/trace/blktrace.c:631
blk_trace_ioctl+0x163/0x290 kernel/trace/blktrace.c:741
blkdev_ioctl+0x111/0x770 block/ioctl.c:622
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x62/0x6a
stack backtrace:
CPU: 1 PID: 15066 Comm: syz-executor.2 Not tainted 6.7.0-rc1-next-20231117-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
print_irq_inversion_bug.part.0+0x3e1/0x590 kernel/locking/lockdep.c:4079
print_irq_inversion_bug kernel/locking/lockdep.c:4032 [inline]
check_usage_forwards kernel/locking/lockdep.c:4110 [inline]
mark_lock_irq kernel/locking/lockdep.c:4242 [inline]
mark_lock+0x570/0xc50 kernel/locking/lockdep.c:4677
mark_usage kernel/locking/lockdep.c:4563 [inline]
__lock_acquire+0x1347/0x3b10 kernel/locking/lockdep.c:5090
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
alarm_handle_timer+0x2d/0x2e0 kernel/time/alarmtimer.c:579
alarmtimer_fired+0x132/0x550 kernel/time/alarmtimer.c:209
__run_hrtimer kernel/time/hrtimer.c:1688 [inline]
__hrtimer_run_queues+0x20c/0xc20 kernel/time/hrtimer.c:1752
hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
__sysvec_apic_timer_interrupt+0x10c/0x410 arch/x86/kernel/apic/apic.c:1082
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:lock_acquire+0x1f2/0x530 kernel/locking/lockdep.c:5721
Code: c1 05 fa 0c 9a 7e 83 f8 01 0f 85 c4 02 00 00 9c 58 f6 c4 02 0f 85 af 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc90015597520 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92002ab2ea6 RCX: 0000000021bd2661
RDX: 0000000000000001 RSI: ffffffff8accc2e0 RDI: ffffffff8b2f1520
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff23e33e8
R10: ffffffff91f19f47 R11: 0000000000000003 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8cfad060 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
rcu_read_lock include/linux/rcupdate.h:747 [inline]
is_bpf_text_address+0x36/0x1a0 kernel/bpf/core.c:733
kernel_text_address kernel/extable.c:125 [inline]
kernel_text_address+0x85/0xf0 kernel/extable.c:94
__kernel_text_address+0xd/0x30 kernel/extable.c:79
unwind_get_return_address+0x78/0xe0 arch/x86/kernel/unwind_orc.c:369
arch_stack_walk+0xbe/0x170 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x24/0x30 mm/kasan/common.c:52
__kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook mm/slab.h:763 [inline]
slab_alloc_node mm/slub.c:3452 [inline]
slab_alloc mm/slub.c:3460 [inline]
__kmem_cache_alloc_lru mm/slub.c:3467 [inline]
kmem_cache_alloc_lru+0x219/0x6f0 mm/slub.c:3483
alloc_inode_sb include/linux/fs.h:2953 [inline]
alloc_inode+0xb3/0x220 fs/inode.c:261
new_inode_pseudo fs/inode.c:1004 [inline]
new_inode+0x22/0x260 fs/inode.c:1030
debugfs_get_inode fs/debugfs/inode.c:72 [inline]
__debugfs_create_file+0x11a/0x620 fs/debugfs/inode.c:429
relay_create_buf_file+0xf0/0x170 kernel/relay.c:360
relay_open_buf.part.0+0x77e/0xba0 kernel/relay.c:389
relay_open_buf kernel/relay.c:536 [inline]
relay_open+0x641/0xab0 kernel/relay.c:517
do_blk_trace_setup+0x4a9/0xaa0 kernel/trace/blktrace.c:591
__blk_trace_setup+0xd8/0x180 kernel/trace/blktrace.c:631
blk_trace_ioctl+0x163/0x290 kernel/trace/blktrace.c:741
blkdev_ioctl+0x111/0x770 block/ioctl.c:622
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7fa6a587cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa6a66770c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa6a599bf80 RCX: 00007fa6a587cae9
RDX: 0000000020000340 RSI: 00000000c0481273 RDI: 0000000000000005
RBP: 00007fa6a58c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fa6a599bf80 R15: 00007ffd12af9ec8
</TASK>
----------------
Code disassembly (best guess):
0: c1 05 fa 0c 9a 7e 83 roll $0x83,0x7e9a0cfa(%rip) # 0x7e9a0d01
7: f8 clc
8: 01 0f add %ecx,(%rdi)
a: 85 c4 test %eax,%esp
c: 02 00 add (%rax),%al
e: 00 9c 58 f6 c4 02 0f add %bl,0xf02c4f6(%rax,%rbx,2)
15: 85 af 02 00 00 48 test %ebp,0x48000002(%rdi)
1b: 85 ed test %ebp,%ebp
1d: 74 01 je 0x20
1f: fb sti
20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
27: fc ff df
* 2a: 48 01 c3 add %rax,%rbx <-- trapping instruction
2d: 48 c7 03 00 00 00 00 movq $0x0,(%rbx)
34: 48 c7 43 08 00 00 00 movq $0x0,0x8(%rbx)
3b: 00
3c: 48 rex.W
3d: 8b .byte 0x8b
3e: 84 .byte 0x84
3f: 24 .byte 0x24