[syzbot] [bpf?] [net?] possible deadlock in tty_port_tty_get (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.kernel..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=158dd231180000
kernel config: https://syzkaller.appspot.com/x/.config?x=1a07d5da4eb21586
dashboard link: https://syzkaller.appspot.com/bug?extid=afcf1c450aca9ec1b5f1
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b42ab0fd4947/disk-fe46a7dd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b8a6e7231930/vmlinux-fe46a7dd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4fbf3e4ce6f8/bzImage-fe46a7dd.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+afcf1c...@syzkaller.appspotmail.com

=====================================================
WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected
6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted
-----------------------------------------------------
kworker/u8:6/1257 [HC0[0]:SC0[2]:HE0:SE0] is trying to acquire:
ffff8880385a9020 (&htab->buckets[i].lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff8880385a9020 (&htab->buckets[i].lock){+...}-{2:2}, at: sock_hash_delete_elem+0xcb/0x260 net/core/sock_map.c:939

and this task is already holding:
ffff888037561958 (&port->lock){-.-.}-{2:2}, at: tty_insert_flip_string_and_push_buffer+0x7f/0x1f0 drivers/tty/tty_buffer.c:557
which would create a new lock dependency:
(&port->lock){-.-.}-{2:2} -> (&htab->buckets[i].lock){+...}-{2:2}

but this new dependency connects a HARDIRQ-irq-safe lock:
(&port->lock){-.-.}-{2:2}

... which became HARDIRQ-irq-safe at:
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
tty_port_tty_get+0x21/0x100 drivers/tty/tty_port.c:327
tty_port_default_wakeup+0x15/0x40 drivers/tty/tty_port.c:66
serial8250_tx_chars+0x55a/0x8b0 drivers/tty/serial/8250/8250_port.c:1835
serial8250_handle_irq+0x5d3/0x780 drivers/tty/serial/8250/8250_port.c:1942
serial8250_default_handle_irq+0x9a/0x210 drivers/tty/serial/8250/8250_port.c:1962
serial8250_interrupt+0x106/0x210 drivers/tty/serial/8250/8250_core.c:127
__handle_irq_event_percpu+0x22c/0x750 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+0x263/0xd10 kernel/irq/chip.c:831
generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
handle_irq arch/x86/kernel/irq.c:238 [inline]
__common_interrupt+0xe1/0x250 arch/x86/kernel/irq.c:257
common_interrupt+0xab/0xd0 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
uart_port_unlock_irqrestore include/linux/serial_core.h:667 [inline]
serial_port_runtime_resume+0x2b7/0x340 drivers/tty/serial/serial_port.c:41
__rpm_callback+0xc8/0x4c0 drivers/base/power/runtime.c:394
rpm_callback+0x1da/0x220 drivers/base/power/runtime.c:448
rpm_resume+0xcf9/0x12f0 drivers/base/power/runtime.c:914
pm_runtime_work+0x10c/0x150 drivers/base/power/runtime.c:979
process_one_work+0x9ac/0x1a60 kernel/workqueue.c:3254
process_scheduled_works kernel/workqueue.c:3335 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
kthread+0x2c4/0x3a0 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243

to a HARDIRQ-irq-unsafe lock:
(&htab->buckets[i].lock){+...}-{2:2}

... which became HARDIRQ-irq-unsafe at:
...
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
sock_hash_delete_elem+0xcb/0x260 net/core/sock_map.c:939
bpf_prog_2c29ac5cdc6b1842+0x42/0x4a
bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
__bpf_prog_run include/linux/filter.h:657 [inline]
bpf_prog_run include/linux/filter.h:664 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
bpf_trace_run4+0x179/0x460 kernel/trace/bpf_trace.c:2422
trace_mm_page_alloc include/trace/events/kmem.h:177 [inline]
__alloc_pages+0x3ad/0x2410 mm/page_alloc.c:4591
alloc_pages_mpol+0x258/0x600 mm/mempolicy.c:2133
vma_alloc_folio+0xad/0x220 mm/mempolicy.c:2172
alloc_anon_folio mm/memory.c:4234 [inline]
do_anonymous_page mm/memory.c:4292 [inline]
do_pte_missing mm/memory.c:3743 [inline]
handle_pte_fault mm/memory.c:5164 [inline]
__handle_mm_fault+0x25ca/0x4920 mm/memory.c:5305
handle_mm_fault+0x476/0xa00 mm/memory.c:5470
do_user_addr_fault+0x426/0x1080 arch/x86/mm/fault.c:1362
handle_page_fault arch/x86/mm/fault.c:1505 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1563
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

other info that might help us debug this:

Possible interrupt unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&htab->buckets[i].lock);
local_irq_disable();
lock(&port->lock);
lock(&htab->buckets[i].lock);
<Interrupt>
lock(&port->lock);

*** DEADLOCK ***

8 locks held by kworker/u8:6/1257:
#0: ffff888015079148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1296/0x1a60 kernel/workqueue.c:3229
#1: ffffc900049bfd80 ((work_completion)(&buf->work)){+.+.}-{0:0}, at: process_one_work+0x906/0x1a60 kernel/workqueue.c:3230
#2: ffff88807e53f8b8 (&port->buf.lock/1){+.+.}-{3:3}, at: flush_to_ldisc+0x31/0x780 drivers/tty/tty_buffer.c:466
#3: ffff88807994e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref+0x1c/0x80 drivers/tty/tty_ldisc.c:263
#4: ffff88807994e2e8 (&o_tty->termios_rwsem/1){++++}-{3:3}, at: n_tty_receive_buf_common+0x85/0x1900 drivers/tty/n_tty.c:1692
#5: ffffc9000421b380 (&ldata->output_lock){+.+.}-{3:3}, at: flush_echoes drivers/tty/n_tty.c:805 [inline]
#5: ffffc9000421b380 (&ldata->output_lock){+.+.}-{3:3}, at: __receive_buf drivers/tty/n_tty.c:1632 [inline]
#5: ffffc9000421b380 (&ldata->output_lock){+.+.}-{3:3}, at: n_tty_receive_buf_common+0x9f2/0x1900 drivers/tty/n_tty.c:1729
#6: ffff888037561958 (&port->lock){-.-.}-{2:2}, at: tty_insert_flip_string_and_push_buffer+0x7f/0x1f0 drivers/tty/tty_buffer.c:557
#7: ffffffff8d7b49e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#7: ffffffff8d7b49e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#7: ffffffff8d7b49e0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline]
#7: ffffffff8d7b49e0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x107/0x460 kernel/trace/bpf_trace.c:2422

the dependencies between HARDIRQ-irq-safe lock and the holding lock:
-> (&port->lock){-.-.}-{2:2} {
IN-HARDIRQ-W at:
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
tty_port_tty_get+0x21/0x100 drivers/tty/tty_port.c:327
tty_port_default_wakeup+0x15/0x40 drivers/tty/tty_port.c:66
serial8250_tx_chars+0x55a/0x8b0 drivers/tty/serial/8250/8250_port.c:1835
serial8250_handle_irq+0x5d3/0x780 drivers/tty/serial/8250/8250_port.c:1942
serial8250_default_handle_irq+0x9a/0x210 drivers/tty/serial/8250/8250_port.c:1962
serial8250_interrupt+0x106/0x210 drivers/tty/serial/8250/8250_core.c:127
__handle_irq_event_percpu+0x22c/0x750 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+0x263/0xd10 kernel/irq/chip.c:831
generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
handle_irq arch/x86/kernel/irq.c:238 [inline]
__common_interrupt+0xe1/0x250 arch/x86/kernel/irq.c:257
common_interrupt+0xab/0xd0 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
uart_port_unlock_irqrestore include/linux/serial_core.h:667 [inline]
serial_port_runtime_resume+0x2b7/0x340 drivers/tty/serial/serial_port.c:41
__rpm_callback+0xc8/0x4c0 drivers/base/power/runtime.c:394
rpm_callback+0x1da/0x220 drivers/base/power/runtime.c:448
rpm_resume+0xcf9/0x12f0 drivers/base/power/runtime.c:914
pm_runtime_work+0x10c/0x150 drivers/base/power/runtime.c:979
process_one_work+0x9ac/0x1a60 kernel/workqueue.c:3254
process_scheduled_works kernel/workqueue.c:3335 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
kthread+0x2c4/0x3a0 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
IN-SOFTIRQ-W at:
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
tty_port_tty_get+0x21/0x100 drivers/tty/tty_port.c:327
tty_port_default_wakeup+0x15/0x40 drivers/tty/tty_port.c:66
serial8250_tx_chars+0x55a/0x8b0 drivers/tty/serial/8250/8250_port.c:1835
serial8250_handle_irq+0x5d3/0x780 drivers/tty/serial/8250/8250_port.c:1942
serial8250_default_handle_irq+0x9a/0x210 drivers/tty/serial/8250/8250_port.c:1962
serial8250_interrupt+0x106/0x210 drivers/tty/serial/8250/8250_core.c:127
__handle_irq_event_percpu+0x22c/0x750 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+0x263/0xd10 kernel/irq/chip.c:831
generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
handle_irq arch/x86/kernel/irq.c:238 [inline]
__common_interrupt+0xe1/0x250 arch/x86/kernel/irq.c:257
common_interrupt+0x52/0xd0 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
__sanitizer_cov_trace_const_cmp4+0x8/0x20 kernel/kcov.c:304
unwind_next_frame+0x46/0x23a0 arch/x86/kernel/unwind_orc.c:475
arch_stack_walk+0x100/0x170 arch/x86/kernel/stacktrace.c:25
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
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
poison_slab_object mm/kasan/common.c:240 [inline]
__kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2106 [inline]
slab_free mm/slub.c:4280 [inline]
kmem_cache_free+0x12e/0x360 mm/slub.c:4344
rcu_do_batch kernel/rcu/tree.c:2196 [inline]
rcu_core+0x82b/0x16b0 kernel/rcu/tree.c:2471
__do_softirq+0x21b/0x8de kernel/softirq.c:554
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu kernel/softirq.c:633 [inline]
irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:112
acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:707
cpuidle_enter_state+0x88/0x510 drivers/cpuidle/cpuidle.c:267
cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:388
cpuidle_idle_call kernel/sched/idle.c:236 [inline]
do_idle+0x313/0x3f0 kernel/sched/idle.c:332
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
start_secondary+0x220/0x2b0 arch/x86/kernel/smpboot.c:313
common_startup_64+0x13e/0x148
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719
__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]
tty_port_open+0x2b/0x1f0 drivers/tty/tty_port.c:768
uart_open+0x41/0x60 drivers/tty/serial/serial_core.c:1982
tty_open+0x3ff/0x1020 drivers/tty/tty_io.c:2152
chrdev_open+0x270/0x6f0 fs/char_dev.c:414
do_dentry_open+0x8dd/0x18c0 fs/open.c:955
do_open fs/namei.c:3642 [inline]
path_openat+0x1dfb/0x2990 fs/namei.c:3799
do_filp_open+0x1dc/0x430 fs/namei.c:3826
file_open_name+0x2a4/0x450 fs/open.c:1351
filp_open+0x4b/0x80 fs/open.c:1371
console_on_rootfs+0x1d/0x80 init/main.c:1508
kernel_init_freeable+0x6f5/0xc40 init/main.c:1555
kernel_init+0x1c/0x2a0 init/main.c:1439
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
}
... key at: [<ffffffff9491ce60>] __key.1+0x0/0x40

the dependencies between the lock to be acquired
and HARDIRQ-irq-unsafe lock:
-> (&htab->buckets[i].lock){+...}-{2:2} {
HARDIRQ-ON-W at:
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
sock_hash_delete_elem+0xcb/0x260 net/core/sock_map.c:939
bpf_prog_2c29ac5cdc6b1842+0x42/0x4a
bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
__bpf_prog_run include/linux/filter.h:657 [inline]
bpf_prog_run include/linux/filter.h:664 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
bpf_trace_run4+0x179/0x460 kernel/trace/bpf_trace.c:2422
trace_mm_page_alloc include/trace/events/kmem.h:177 [inline]
__alloc_pages+0x3ad/0x2410 mm/page_alloc.c:4591
alloc_pages_mpol+0x258/0x600 mm/mempolicy.c:2133
vma_alloc_folio+0xad/0x220 mm/mempolicy.c:2172
alloc_anon_folio mm/memory.c:4234 [inline]
do_anonymous_page mm/memory.c:4292 [inline]
do_pte_missing mm/memory.c:3743 [inline]
handle_pte_fault mm/memory.c:5164 [inline]
__handle_mm_fault+0x25ca/0x4920 mm/memory.c:5305
handle_mm_fault+0x476/0xa00 mm/memory.c:5470
do_user_addr_fault+0x426/0x1080 arch/x86/mm/fault.c:1362
handle_page_fault arch/x86/mm/fault.c:1505 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1563
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
sock_hash_delete_elem+0xcb/0x260 net/core/sock_map.c:939
bpf_prog_2c29ac5cdc6b1842+0x42/0x4a
bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
__bpf_prog_run include/linux/filter.h:657 [inline]
bpf_prog_run include/linux/filter.h:664 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
bpf_trace_run4+0x179/0x460 kernel/trace/bpf_trace.c:2422
trace_mm_page_alloc include/trace/events/kmem.h:177 [inline]
__alloc_pages+0x3ad/0x2410 mm/page_alloc.c:4591
alloc_pages_mpol+0x258/0x600 mm/mempolicy.c:2133
vma_alloc_folio+0xad/0x220 mm/mempolicy.c:2172
alloc_anon_folio mm/memory.c:4234 [inline]
do_anonymous_page mm/memory.c:4292 [inline]
do_pte_missing mm/memory.c:3743 [inline]
handle_pte_fault mm/memory.c:5164 [inline]
__handle_mm_fault+0x25ca/0x4920 mm/memory.c:5305
handle_mm_fault+0x476/0xa00 mm/memory.c:5470
do_user_addr_fault+0x426/0x1080 arch/x86/mm/fault.c:1362
handle_page_fault arch/x86/mm/fault.c:1505 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1563
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
}
... key at: [<ffffffff949d0480>] __key.0+0x0/0x40
... acquired at:
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
sock_hash_delete_elem+0xcb/0x260 net/core/sock_map.c:939
bpf_prog_2c29ac5cdc6b1842+0x42/0x4a
bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
__bpf_prog_run include/linux/filter.h:657 [inline]
bpf_prog_run include/linux/filter.h:664 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
bpf_trace_run4+0x179/0x460 kernel/trace/bpf_trace.c:2422
trace_mm_page_alloc include/trace/events/kmem.h:177 [inline]
__alloc_pages+0x3ad/0x2410 mm/page_alloc.c:4591
alloc_pages_mpol+0x258/0x600 mm/mempolicy.c:2133
stack_depot_save_flags+0x568/0x8f0 lib/stackdepot.c:676
save_stack+0x16f/0x1f0 mm/page_owner.c:130
__set_page_owner+0x1f/0x60 mm/page_owner.c:195
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1533
prep_new_page mm/page_alloc.c:1540 [inline]
get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311
__alloc_pages+0x22b/0x2410 mm/page_alloc.c:4569
alloc_pages_mpol+0x258/0x600 mm/mempolicy.c:2133
stack_depot_save_flags+0x568/0x8f0 lib/stackdepot.c:676
kasan_save_stack+0x42/0x60 mm/kasan/common.c:48
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slub.c:3966 [inline]
__kmalloc+0x1f9/0x440 mm/slub.c:3979
kmalloc include/linux/slab.h:632 [inline]
tty_buffer_alloc+0x297/0x3d0 drivers/tty/tty_buffer.c:179
__tty_buffer_request_room+0x12e/0x2d0 drivers/tty/tty_buffer.c:272
__tty_insert_flip_string_flags+0xd7/0x400 drivers/tty/tty_buffer.c:308
tty_insert_flip_string_fixed_flag include/linux/tty_flip.h:35 [inline]
tty_insert_flip_string include/linux/tty_flip.h:83 [inline]
tty_insert_flip_string_and_push_buffer+0x9d/0x1f0 drivers/tty/tty_buffer.c:558
pty_write+0xd2/0x100 drivers/tty/pty.c:118
tty_put_char+0x132/0x160 drivers/tty/tty_io.c:3168
n_tty_process_echo_ops drivers/tty/n_tty.c:663 [inline]
__process_echoes+0x7fe/0xb40 drivers/tty/n_tty.c:709
flush_echoes drivers/tty/n_tty.c:807 [inline]
__receive_buf drivers/tty/n_tty.c:1632 [inline]
n_tty_receive_buf_common+0xa39/0x1900 drivers/tty/n_tty.c:1729
tty_ldisc_receive_buf+0xa5/0x190 drivers/tty/tty_buffer.c:386
tty_port_default_receive_buf+0x70/0xb0 drivers/tty/tty_port.c:37
receive_buf drivers/tty/tty_buffer.c:444 [inline]
flush_to_ldisc+0x267/0x780 drivers/tty/tty_buffer.c:494
process_one_work+0x9ac/0x1a60 kernel/workqueue.c:3254
process_scheduled_works kernel/workqueue.c:3335 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
kthread+0x2c4/0x3a0 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243


stack backtrace:
CPU: 1 PID: 1257 Comm: kworker/u8:6 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Workqueue: events_unbound flush_to_ldisc
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
print_bad_irq_dependency kernel/locking/lockdep.c:2626 [inline]
check_irq_usage+0xe3c/0x1490 kernel/locking/lockdep.c:2865
check_prev_add kernel/locking/lockdep.c:3138 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x248e/0x3b30 kernel/locking/lockdep.c:5137
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
sock_hash_delete_elem+0xcb/0x260 net/core/sock_map.c:939
bpf_prog_2c29ac5cdc6b1842+0x42/0x4a
bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
__bpf_prog_run include/linux/filter.h:657 [inline]
bpf_prog_run include/linux/filter.h:664 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
bpf_trace_run4+0x179/0x460 kernel/trace/bpf_trace.c:2422
trace_mm_page_alloc include/trace/events/kmem.h:177 [inline]
__alloc_pages+0x3ad/0x2410 mm/page_alloc.c:4591
alloc_pages_mpol+0x258/0x600 mm/mempolicy.c:2133
stack_depot_save_flags+0x568/0x8f0 lib/stackdepot.c:676
save_stack+0x16f/0x1f0 mm/page_owner.c:130
__set_page_owner+0x1f/0x60 mm/page_owner.c:195
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1533
prep_new_page mm/page_alloc.c:1540 [inline]
get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311
__alloc_pages+0x22b/0x2410 mm/page_alloc.c:4569
alloc_pages_mpol+0x258/0x600 mm/mempolicy.c:2133
stack_depot_save_flags+0x568/0x8f0 lib/stackdepot.c:676
kasan_save_stack+0x42/0x60 mm/kasan/common.c:48
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slub.c:3966 [inline]
__kmalloc+0x1f9/0x440 mm/slub.c:3979
kmalloc include/linux/slab.h:632 [inline]
tty_buffer_alloc+0x297/0x3d0 drivers/tty/tty_buffer.c:179
__tty_buffer_request_room+0x12e/0x2d0 drivers/tty/tty_buffer.c:272
__tty_insert_flip_string_flags+0xd7/0x400 drivers/tty/tty_buffer.c:308
tty_insert_flip_string_fixed_flag include/linux/tty_flip.h:35 [inline]
tty_insert_flip_string include/linux/tty_flip.h:83 [inline]
tty_insert_flip_string_and_push_buffer+0x9d/0x1f0 drivers/tty/tty_buffer.c:558
pty_write+0xd2/0x100 drivers/tty/pty.c:118
tty_put_char+0x132/0x160 drivers/tty/tty_io.c:3168
n_tty_process_echo_ops drivers/tty/n_tty.c:663 [inline]
__process_echoes+0x7fe/0xb40 drivers/tty/n_tty.c:709
flush_echoes drivers/tty/n_tty.c:807 [inline]
__receive_buf drivers/tty/n_tty.c:1632 [inline]
n_tty_receive_buf_common+0xa39/0x1900 drivers/tty/n_tty.c:1729
tty_ldisc_receive_buf+0xa5/0x190 drivers/tty/tty_buffer.c:386
tty_port_default_receive_buf+0x70/0xb0 drivers/tty/tty_port.c:37
receive_buf drivers/tty/tty_buffer.c:444 [inline]
flush_to_ldisc+0x267/0x780 drivers/tty/tty_buffer.c:494
process_one_work+0x9ac/0x1a60 kernel/workqueue.c:3254
process_scheduled_works kernel/workqueue.c:3335 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
kthread+0x2c4/0x3a0 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
</TASK>
------------[ cut here ]------------
raw_local_irq_restore() called with IRQs enabled
WARNING: CPU: 1 PID: 1257 at kernel/locking/irqflag-debug.c:10 warn_bogus_irq_restore+0x29/0x30 kernel/locking/irqflag-debug.c:10
Modules linked in:
CPU: 1 PID: 1257 Comm: kworker/u8:6 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Workqueue: events_unbound flush_to_ldisc
RIP: 0010:warn_bogus_irq_restore+0x29/0x30 kernel/locking/irqflag-debug.c:10
Code: 90 f3 0f 1e fa 90 80 3d be b2 b5 04 00 74 06 90 e9 3c f8 03 00 c6 05 af b2 b5 04 01 90 48 c7 c7 00 c3 0c 8b e8 98 c2 7d f6 90 <0f> 0b 90 90 eb df 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900049bf8e8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888037561940 RCX: ffffffff8150f3e9
RDX: ffff888022f18000 RSI: ffffffff8150f3f6 RDI: 0000000000000001
RBP: 0000000000000293 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 1ffff92000937f22
R13: 0000000000000293 R14: ffff888037561940 R15: ffff88803a96f800
FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c6a9e1b178 CR3: 0000000039aa0000 CR4: 0000000000350ef0
Call Trace:
<TASK>
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
_raw_spin_unlock_irqrestore+0x74/0x80 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
tty_insert_flip_string_and_push_buffer+0x143/0x1f0 drivers/tty/tty_buffer.c:561
pty_write+0xd2/0x100 drivers/tty/pty.c:118
tty_put_char+0x132/0x160 drivers/tty/tty_io.c:3168
n_tty_process_echo_ops drivers/tty/n_tty.c:663 [inline]
__process_echoes+0x7fe/0xb40 drivers/tty/n_tty.c:709
flush_echoes drivers/tty/n_tty.c:807 [inline]
__receive_buf drivers/tty/n_tty.c:1632 [inline]
n_tty_receive_buf_common+0xa39/0x1900 drivers/tty/n_tty.c:1729
tty_ldisc_receive_buf+0xa5/0x190 drivers/tty/tty_buffer.c:386
tty_port_default_receive_buf+0x70/0xb0 drivers/tty/tty_port.c:37
receive_buf drivers/tty/tty_buffer.c:444 [inline]
flush_to_ldisc+0x267/0x780 drivers/tty/tty_buffer.c:494
process_one_work+0x9ac/0x1a60 kernel/workqueue.c:3254
process_scheduled_works kernel/workqueue.c:3335 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
kthread+0x2c4/0x3a0 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
</TASK>


---
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[Tetsuo Handa]

#syz fix: bpf, sockmap: Prevent lock inversion deadlock in map delete elem