RBP: 00007f4d3c1b21d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd34906d1f R14: 00007f4d3c1b2300 R15: 0000000000022000
======================================================
WARNING: possible circular locking dependency detected
5.10.56 #1 Not tainted
------------------------------------------------------
syz-executor.5/10629 is trying to acquire lock:
ffffffff84d0a8a0 (console_owner){-.-.}-{0:0}, at: console_unlock+0x2e1/0xb30 kernel/printk/printk.c:2498

but task is already holding lock:
ffffffff84c0a158 (pidmap_lock){....}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:379 [inline]
ffffffff84c0a158 (pidmap_lock){....}-{2:2}, at: alloc_pid+0x48d/0xd20 kernel/pid.c:209

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #6 (pidmap_lock){....}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x36/0x50 kernel/locking/spinlock.c:159
       free_pid+0x32/0x260 kernel/pid.c:132
       __change_pid+0x1d3/0x2d0 kernel/pid.c:353
       __unhash_process kernel/exit.c:77 [inline]
       __exit_signal kernel/exit.c:148 [inline]
       release_task+0xd83/0x1370 kernel/exit.c:199
       exit_notify kernel/exit.c:685 [inline]
       do_exit+0x15b3/0x2770 kernel/exit.c:831
       __module_put_and_exit+0x1b/0x20 kernel/module.c:348
       cryptomgr_test+0x29/0x30 crypto/algboss.c:212
       kthread+0x38f/0x470 kernel/kthread.c:292
       ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:296

-> #5 (&____s->seqcount#4){....}-{0:0}:
       seqcount_lockdep_reader_access include/linux/seqlock.h:103 [inline]
       read_seqbegin include/linux/seqlock.h:835 [inline]
       read_seqbegin_or_lock_irqsave include/linux/seqlock.h:1196 [inline]
       thread_group_cputime+0xf1/0x820 kernel/sched/cputime.c:317
       thread_group_cputime_adjusted+0x72/0xf0 kernel/sched/cputime.c:629
       do_task_stat+0x7c5/0x1c90 fs/proc/array.c:513
       proc_single_show+0x121/0x1f0 fs/proc/base.c:775
       seq_read_iter+0x50c/0x12b0 fs/seq_file.c:230
       seq_read+0x3dd/0x5b0 fs/seq_file.c:162
       vfs_read+0x228/0x580 fs/read_write.c:494
       ksys_read+0x12d/0x250 fs/read_write.c:634
       do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
       entry_SYSCALL_64_after_hwframe+0x44/0xa9

-> #4 (&sighand->siglock){....}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x36/0x50 kernel/locking/spinlock.c:159
       __lock_task_sighand+0xd3/0x2f0 kernel/signal.c:1391
       lock_task_sighand include/linux/sched/signal.h:693 [inline]
       task_work_add+0x1db/0x2b0 kernel/task_work.c:58
       io_req_task_work_add fs/io_uring.c:2049 [inline]
       __io_async_wake+0x40b/0x8d0 fs/io_uring.c:4955
       __wake_up_common+0x14c/0x4c0 kernel/sched/wait.c:93
       __wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:123
       tty_ldisc_lock+0x40/0xb0 drivers/tty/tty_ldisc.c:335
       tty_ldisc_hangup+0x204/0x690 drivers/tty/tty_ldisc.c:744
       __tty_hangup.part.0+0x50d/0x9b0 drivers/tty/tty_io.c:624
       __tty_hangup drivers/tty/tty_io.c:574 [inline]
       tty_vhangup drivers/tty/tty_io.c:697 [inline]
       tty_ioctl+0x103e/0x17c0 drivers/tty/tty_io.c:2683
       vfs_ioctl fs/ioctl.c:48 [inline]
       __do_sys_ioctl fs/ioctl.c:753 [inline]
       __se_sys_ioctl fs/ioctl.c:739 [inline]
       __x64_sys_ioctl+0x196/0x210 fs/ioctl.c:739
       do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
       entry_SYSCALL_64_after_hwframe+0x44/0xa9

-> #3 (&tty->read_wait){....}-{2:2}:
       __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
       _raw_spin_lock+0x27/0x40 kernel/locking/spinlock.c:151
       spin_lock include/linux/spinlock.h:354 [inline]
       io_poll_double_wake+0x1f8/0x550 fs/io_uring.c:5068
       __wake_up_common+0x14c/0x4c0 kernel/sched/wait.c:93
       __wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:123
       tty_ldisc_lock+0x55/0xb0 drivers/tty/tty_ldisc.c:336
       tty_ldisc_hangup+0x204/0x690 drivers/tty/tty_ldisc.c:744
       __tty_hangup.part.0+0x50d/0x9b0 drivers/tty/tty_io.c:624
       __tty_hangup drivers/tty/tty_io.c:574 [inline]
       tty_vhangup drivers/tty/tty_io.c:697 [inline]
       tty_ioctl+0x103e/0x17c0 drivers/tty/tty_io.c:2683
       vfs_ioctl fs/ioctl.c:48 [inline]
       __do_sys_ioctl fs/ioctl.c:753 [inline]
       __se_sys_ioctl fs/ioctl.c:739 [inline]
       __x64_sys_ioctl+0x196/0x210 fs/ioctl.c:739
       do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
       entry_SYSCALL_64_after_hwframe+0x44/0xa9

-> #2 (&tty->write_wait){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x36/0x50 kernel/locking/spinlock.c:159
       __wake_up_common_lock+0xb4/0x130 kernel/sched/wait.c:122
       tty_port_default_wakeup+0x26/0x40 drivers/tty/tty_port.c:50
       serial8250_tx_chars+0x516/0xb40 drivers/tty/serial/8250/8250_port.c:1844
       serial8250_handle_irq.part.0+0x3f1/0x4c0 drivers/tty/serial/8250/8250_port.c:1931
       serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1904 [inline]
       serial8250_default_handle_irq+0xb8/0x230 drivers/tty/serial/8250/8250_port.c:1947
       serial8250_interrupt+0xf4/0x1a0 drivers/tty/serial/8250/8250_core.c:126
       __handle_irq_event_percpu+0x2ef/0x820 kernel/irq/handle.c:156
       handle_irq_event_percpu kernel/irq/handle.c:196 [inline]
       handle_irq_event+0x102/0x290 kernel/irq/handle.c:213
       handle_edge_irq+0x249/0xd00 kernel/irq/chip.c:819
       asm_call_irq_on_stack+0x12/0x20
       __run_irq_on_irqstack arch/x86/include/asm/irq_stack.h:48 [inline]
       run_irq_on_irqstack_cond arch/x86/include/asm/irq_stack.h:101 [inline]
       handle_irq arch/x86/kernel/irq.c:230 [inline]
       __common_interrupt arch/x86/kernel/irq.c:249 [inline]
       common_interrupt+0xdd/0x190 arch/x86/kernel/irq.c:239
       asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:626
       native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
       arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
       _raw_spin_unlock_irqrestore+0x25/0x40 kernel/locking/spinlock.c:191
       spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
       uart_write+0x304/0x580 drivers/tty/serial/serial_core.c:615
       do_output_char+0x5e4/0x860 drivers/tty/n_tty.c:442
       process_output drivers/tty/n_tty.c:509 [inline]
       n_tty_write+0x487/0xf90 drivers/tty/n_tty.c:2361
       do_tty_write drivers/tty/tty_io.c:1028 [inline]
       file_tty_write.constprop.0+0x4f8/0x8d0 drivers/tty/tty_io.c:1118
       redirected_tty_write+0xa1/0xc0 drivers/tty/tty_io.c:1125
       call_write_iter include/linux/fs.h:1903 [inline]
       do_iter_readv_writev+0x476/0x750 fs/read_write.c:740
       do_iter_write+0x18d/0x670 fs/read_write.c:866
       vfs_writev+0x1aa/0x5e0 fs/read_write.c:939
       do_writev+0x139/0x300 fs/read_write.c:982
       do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
       entry_SYSCALL_64_after_hwframe+0x44/0xa9

-> #1 (&port_lock_key){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x36/0x50 kernel/locking/spinlock.c:159
       serial8250_console_write+0x8dd/0xb20 drivers/tty/serial/8250/8250_port.c:3317
       call_console_drivers kernel/printk/printk.c:1909 [inline]
       console_unlock+0x826/0xb30 kernel/printk/printk.c:2523
       register_console kernel/printk/printk.c:2864 [inline]
       register_console+0x53d/0x800 kernel/printk/printk.c:2754
       univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:690
       console_init+0x361/0x4fa kernel/printk/printk.c:2974
       start_kernel+0x2f2/0x49b init/main.c:984
       secondary_startup_64_no_verify+0xc2/0xcb

-> #0 (console_owner){-.-.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:2985 [inline]
       check_prevs_add kernel/locking/lockdep.c:3110 [inline]
       validate_chain kernel/locking/lockdep.c:3725 [inline]
       __lock_acquire+0x29f6/0x5b20 kernel/locking/lockdep.c:4950
       lock_acquire kernel/locking/lockdep.c:5560 [inline]
       lock_acquire+0x197/0x490 kernel/locking/lockdep.c:5525
       console_lock_spinning_enable kernel/printk/printk.c:1761 [inline]
       console_unlock+0x360/0xb30 kernel/printk/printk.c:2520
       vprintk_emit+0x1da/0x4d0 kernel/printk/printk.c:2052
       vprintk_func+0x8b/0x140 kernel/printk/printk_safe.c:401
       printk+0xba/0xed kernel/printk/printk.c:2100
       fail_dump lib/fault-inject.c:45 [inline]
       should_fail+0x472/0x5a0 lib/fault-inject.c:146
       should_failslab+0x5/0x10 mm/slab_common.c:1193
       slab_pre_alloc_hook mm/slab.h:515 [inline]
       slab_alloc_node mm/slub.c:2814 [inline]
       slab_alloc mm/slub.c:2897 [inline]
       kmem_cache_alloc+0x5b/0x350 mm/slub.c:2902
       radix_tree_node_alloc.constprop.0+0x1df/0x300 lib/radix-tree.c:251
       idr_get_free+0x4b5/0x8f0 lib/radix-tree.c:1504
       idr_alloc_u32+0x170/0x2d0 lib/idr.c:46
       idr_alloc_cyclic+0x102/0x230 lib/idr.c:125
       alloc_pid+0x4f7/0xd20 kernel/pid.c:233
       copy_process+0x26b6/0x6650 kernel/fork.c:2120
       kernel_clone+0xe7/0xa20 kernel/fork.c:2465
       __do_sys_clone3+0x1dd/0x310 kernel/fork.c:2740
       do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
       entry_SYSCALL_64_after_hwframe+0x44/0xa9

other info that might help us debug this:

Chain exists of:
  console_owner --> &____s->seqcount#4 --> pidmap_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(pidmap_lock);
                               lock(&____s->seqcount#4);
                               lock(pidmap_lock);
  lock(console_owner);

 *** DEADLOCK ***

3 locks held by syz-executor.5/10629:
 #0: ffff88806ce31160 (lock#2){+.+.}-{2:2}, at: __radix_tree_preload+0x0/0x690 lib/radix-tree.c:877
 #1: ffffffff84c0a158 (pidmap_lock){....}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:379 [inline]
 #1: ffffffff84c0a158 (pidmap_lock){....}-{2:2}, at: alloc_pid+0x48d/0xd20 kernel/pid.c:209
 #2: ffffffff84deac20 (console_lock){+.+.}-{0:0}, at: vprintk_func+0x8b/0x140 kernel/printk/printk_safe.c:401

stack backtrace:
CPU: 0 PID: 10629 Comm: syz-executor.5 Not tainted 5.10.56 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2120
 check_prev_add kernel/locking/lockdep.c:2985 [inline]
 check_prevs_add kernel/locking/lockdep.c:3110 [inline]
 validate_chain kernel/locking/lockdep.c:3725 [inline]
 __lock_acquire+0x29f6/0x5b20 kernel/locking/lockdep.c:4950
 lock_acquire kernel/locking/lockdep.c:5560 [inline]
 lock_acquire+0x197/0x490 kernel/locking/lockdep.c:5525
 console_lock_spinning_enable kernel/printk/printk.c:1761 [inline]
 console_unlock+0x360/0xb30 kernel/printk/printk.c:2520
 vprintk_emit+0x1da/0x4d0 kernel/printk/printk.c:2052
 vprintk_func+0x8b/0x140 kernel/printk/printk_safe.c:401
 printk+0xba/0xed kernel/printk/printk.c:2100
 fail_dump lib/fault-inject.c:45 [inline]
 should_fail+0x472/0x5a0 lib/fault-inject.c:146
 should_failslab+0x5/0x10 mm/slab_common.c:1193
 slab_pre_alloc_hook mm/slab.h:515 [inline]
 slab_alloc_node mm/slub.c:2814 [inline]
 slab_alloc mm/slub.c:2897 [inline]
 kmem_cache_alloc+0x5b/0x350 mm/slub.c:2902
 radix_tree_node_alloc.constprop.0+0x1df/0x300 lib/radix-tree.c:251
 idr_get_free+0x4b5/0x8f0 lib/radix-tree.c:1504
 idr_alloc_u32+0x170/0x2d0 lib/idr.c:46
 idr_alloc_cyclic+0x102/0x230 lib/idr.c:125
 alloc_pid+0x4f7/0xd20 kernel/pid.c:233
 copy_process+0x26b6/0x6650 kernel/fork.c:2120
 kernel_clone+0xe7/0xa20 kernel/fork.c:2465
 __do_sys_clone3+0x1dd/0x310 kernel/fork.c:2740
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x466609
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4d3c1b2188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609
RDX: 0000000000000000 RSI: 0000000000000058 RDI: 00000000200008c0
RBP: 00007f4d3c1b21d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd34906d1f R14: 00007f4d3c1b2300 R15: 0000000000022000
hpet: Lost 11 RTC interrupts
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 10663 Comm: syz-executor.5 Not tainted 5.10.56 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 should_failslab+0x5/0x10 mm/slab_common.c:1193
 slab_pre_alloc_hook mm/slab.h:515 [inline]
 slab_alloc_node mm/slub.c:2814 [inline]
 slab_alloc mm/slub.c:2897 [inline]
 kmem_cache_alloc+0x5b/0x350 mm/slub.c:2902
 mem_pool_alloc mm/kmemleak.c:423 [inline]
 create_object.isra.0+0x3a/0xa20 mm/kmemleak.c:578
 kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
 slab_post_alloc_hook mm/slab.h:534 [inline]
 slab_alloc_node mm/slub.c:2889 [inline]
 slab_alloc mm/slub.c:2897 [inline]
 kmem_cache_alloc+0x159/0x350 mm/slub.c:2902
 radix_tree_node_alloc.constprop.0+0x1df/0x300 lib/radix-tree.c:251
 idr_get_free+0x4b5/0x8f0 lib/radix-tree.c:1504
 idr_alloc_u32+0x170/0x2d0 lib/idr.c:46
 idr_alloc_cyclic+0x102/0x230 lib/idr.c:125
 alloc_pid+0x4f7/0xd20 kernel/pid.c:233
 copy_process+0x26b6/0x6650 kernel/fork.c:2120
 kernel_clone+0xe7/0xa20 kernel/fork.c:2465
 __do_sys_clone3+0x1dd/0x310 kernel/fork.c:2740
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x466609
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4d3c1b2188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609
RDX: 0000000000000000 RSI: 0000000000000058 RDI: 00000000200008c0
RBP: 00007f4d3c1b21d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd34906d1f R14: 00007f4d3c1b2300 R15: 0000000000022000
hpet: Lost 1 RTC interrupts
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 10690 Comm: syz-executor.5 Not tainted 5.10.56 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 should_failslab+0x5/0x10 mm/slab_common.c:1193
 slab_pre_alloc_hook mm/slab.h:515 [inline]
 slab_alloc_node mm/slub.c:2814 [inline]
 slab_alloc mm/slub.c:2897 [inline]
 kmem_cache_alloc+0x5b/0x350 mm/slub.c:2902
 __d_alloc+0x2a/0x990 fs/dcache.c:1709
 d_alloc_pseudo+0x19/0x70 fs/dcache.c:1838
 alloc_file_pseudo+0xce/0x250 fs/file_table.c:226
 anon_inode_getfile fs/anon_inodes.c:91 [inline]
 anon_inode_getfile+0xc8/0x1f0 fs/anon_inodes.c:74
 copy_process+0x2748/0x6650 kernel/fork.c:2140
 kernel_clone+0xe7/0xa20 kernel/fork.c:2465
 __do_sys_clone3+0x1dd/0x310 kernel/fork.c:2740
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x466609
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4d3c1b2188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609
RDX: 0000000000000000 RSI: 0000000000000058 RDI: 00000000200008c0
RBP: 00007f4d3c1b21d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd34906d1f R14: 00007f4d3c1b2300 R15: 0000000000022000
hpet: Lost 1 RTC interrupts
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 10707 Comm: syz-executor.5 Not tainted 5.10.56 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 should_failslab+0x5/0x10 mm/slab_common.c:1193
 slab_pre_alloc_hook mm/slab.h:515 [inline]
 slab_alloc_node mm/slub.c:2814 [inline]
 slab_alloc mm/slub.c:2897 [inline]
 kmem_cache_alloc+0x5b/0x350 mm/slub.c:2902
 mem_pool_alloc mm/kmemleak.c:423 [inline]
 create_object.isra.0+0x3a/0xa20 mm/kmemleak.c:578
 kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
 slab_post_alloc_hook mm/slab.h:534 [inline]
 slab_alloc_node mm/slub.c:2889 [inline]
 slab_alloc mm/slub.c:2897 [inline]
 kmem_cache_alloc+0x159/0x350 mm/slub.c:2902
 __d_alloc+0x2a/0x990 fs/dcache.c:1709
 d_alloc_pseudo+0x19/0x70 fs/dcache.c:1838
 alloc_file_pseudo+0xce/0x250 fs/file_table.c:226
 anon_inode_getfile fs/anon_inodes.c:91 [inline]
 anon_inode_getfile+0xc8/0x1f0 fs/anon_inodes.c:74
 copy_process+0x2748/0x6650 kernel/fork.c:2140
 kernel_clone+0xe7/0xa20 kernel/fork.c:2465
 __do_sys_clone3+0x1dd/0x310 kernel/fork.c:2740
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x466609
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4d3c1b2188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609
RDX: 0000000000000000 RSI: 0000000000000058 RDI: 00000000200008c0
RBP: 00007f4d3c1b21d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd34906d1f R14: 00007f4d3c1b2300 R15: 0000000000022000
hpet: Lost 1 RTC interrupts