R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffcc03efa9f R14: 00007f8f140f6300 R15: 0000000000022000
kmemleak: Cannot allocate a scan area, scanning the full object
======================================================
WARNING: possible circular locking dependency detected
5.10.56 #1 Not tainted
------------------------------------------------------
syz-executor.4/17931 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:
ffff88804cc97cc8 (&object->lock){..-.}-{2:2}, at: add_scan_area mm/kmemleak.c:801 [inline]
ffff88804cc97cc8 (&object->lock){..-.}-{2:2}, at: kmemleak_scan_area+0x80/0x350 mm/kmemleak.c:1087

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #5 (&object->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
       __delete_object+0x87/0x100 mm/kmemleak.c:670
       kmemleak_free_recursive include/linux/kmemleak.h:49 [inline]
       slab_free_hook mm/slub.c:1517 [inline]
       slab_free_freelist_hook+0xb0/0x150 mm/slub.c:1575
       slab_free mm/slub.c:3140 [inline]
       kmem_cache_free+0x97/0x2f0 mm/slub.c:3156
       __sigqueue_free kernel/signal.c:611 [inline]
       collect_signal+0x2a4/0x520 kernel/signal.c:597
       __dequeue_signal kernel/signal.c:619 [inline]
       dequeue_signal+0x322/0x620 kernel/signal.c:639
       get_signal+0x6e9/0x2200 kernel/signal.c:2648
       arch_do_signal+0x88/0x1b70 arch/x86/kernel/signal.c:805
       exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
       exit_to_user_mode_prepare+0xf7/0x160 kernel/entry/common.c:191
       syscall_exit_to_user_mode+0x38/0x230 kernel/entry/common.c:266
       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
       add_scan_area mm/kmemleak.c:803 [inline]
       kmemleak_scan_area+0x328/0x350 mm/kmemleak.c:1087
       alloc_vmap_area+0x171/0x1d10 mm/vmalloc.c:1177
       __get_vm_area_node+0x127/0x340 mm/vmalloc.c:2080
       get_vm_area_caller+0x70/0xa0 mm/vmalloc.c:2122
       vmap+0xe9/0x2c0 mm/vmalloc.c:2398
       relay_alloc_buf kernel/relay.c:141 [inline]
       relay_create_buf kernel/relay.c:177 [inline]
       relay_open_buf.part.0+0x4cb/0xc00 kernel/relay.c:453
       relay_open_buf kernel/relay.c:450 [inline]
       relay_open kernel/relay.c:605 [inline]
       relay_open+0x531/0xa10 kernel/relay.c:564
       do_blk_trace_setup+0x4db/0xbf0 kernel/trace/blktrace.c:557
       __blk_trace_setup+0xca/0x180 kernel/trace/blktrace.c:597
       blk_trace_ioctl+0x155/0x290 kernel/trace/blktrace.c:738
       blkdev_ioctl+0xc1/0x700 block/ioctl.c:625
       block_ioctl+0xf9/0x140 fs/block_dev.c:1893
       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

other info that might help us debug this:

Chain exists of:
  console_owner --> &sighand->siglock --> &object->lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&object->lock);
                               lock(&sighand->siglock);
                               lock(&object->lock);
  lock(console_owner);

 *** DEADLOCK ***

4 locks held by syz-executor.4/17931:
 #0: ffff88800dc9a980 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xd2/0x290 kernel/trace/blktrace.c:733
 #1: ffffffff84e368a8 (relay_channels_mutex){+.+.}-{3:3}, at: relay_open kernel/relay.c:603 [inline]
 #1: ffffffff84e368a8 (relay_channels_mutex){+.+.}-{3:3}, at: relay_open+0x3e1/0xa10 kernel/relay.c:564
 #2: ffff88804cc97cc8 (&object->lock){..-.}-{2:2}, at: add_scan_area mm/kmemleak.c:801 [inline]
 #2: ffff88804cc97cc8 (&object->lock){..-.}-{2:2}, at: kmemleak_scan_area+0x80/0x350 mm/kmemleak.c:1087
 #3: ffffffff84deac20 (console_lock){+.+.}-{0:0}, at: vprintk_func+0x8b/0x140 kernel/printk/printk_safe.c:401

stack backtrace:
CPU: 0 PID: 17931 Comm: syz-executor.4 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
 add_scan_area mm/kmemleak.c:803 [inline]
 kmemleak_scan_area+0x328/0x350 mm/kmemleak.c:1087
 alloc_vmap_area+0x171/0x1d10 mm/vmalloc.c:1177
 __get_vm_area_node+0x127/0x340 mm/vmalloc.c:2080
 get_vm_area_caller+0x70/0xa0 mm/vmalloc.c:2122
 vmap+0xe9/0x2c0 mm/vmalloc.c:2398
 relay_alloc_buf kernel/relay.c:141 [inline]
 relay_create_buf kernel/relay.c:177 [inline]
 relay_open_buf.part.0+0x4cb/0xc00 kernel/relay.c:453
 relay_open_buf kernel/relay.c:450 [inline]
 relay_open kernel/relay.c:605 [inline]
 relay_open+0x531/0xa10 kernel/relay.c:564
 do_blk_trace_setup+0x4db/0xbf0 kernel/trace/blktrace.c:557
 __blk_trace_setup+0xca/0x180 kernel/trace/blktrace.c:597
 blk_trace_ioctl+0x155/0x290 kernel/trace/blktrace.c:738
 blkdev_ioctl+0xc1/0x700 block/ioctl.c:625
 block_ioctl+0xf9/0x140 fs/block_dev.c:1893
 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
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:00007f8f140f6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609
RDX: 0000000020000000 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00007f8f140f61d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffcc03efa9f R14: 00007f8f140f6300 R15: 0000000000022000
debugfs: File 'dropped' in directory 'loop0' already present!
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=56 sclass=netlink_route_socket pid=17948 comm=syz-executor.3
debugfs: File 'trace0' in directory 'loop8' already present!
netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'.
debugfs: File 'msg' in directory 'loop0' already present!
FAULT_INJECTION: forcing a failure.
name fail_page_alloc, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 17928 Comm: syz-executor.0 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
 prepare_alloc_pages mm/page_alloc.c:4899 [inline]
 __alloc_pages_nodemask+0x182/0x680 mm/page_alloc.c:4941
 alloc_pages_current+0x187/0x280 mm/mempolicy.c:2271
 alloc_pages include/linux/gfp.h:547 [inline]
 relay_alloc_buf kernel/relay.c:136 [inline]
 relay_create_buf kernel/relay.c:177 [inline]
 relay_open_buf.part.0+0x2a5/0xc00 kernel/relay.c:453
 relay_open_buf kernel/relay.c:450 [inline]
 relay_open kernel/relay.c:605 [inline]
 relay_open+0x531/0xa10 kernel/relay.c:564
 do_blk_trace_setup+0x4db/0xbf0 kernel/trace/blktrace.c:557
 __blk_trace_setup+0xca/0x180 kernel/trace/blktrace.c:597
 blk_trace_ioctl+0x155/0x290 kernel/trace/blktrace.c:738
 blkdev_ioctl+0xc1/0x700 block/ioctl.c:625
 block_ioctl+0xf9/0x140 fs/block_dev.c:1893
 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
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:00007f8c6f464188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609
RDX: 0000000020000000 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00007f8c6f4641d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffc8f9f3f2f R14: 00007f8c6f464300 R15: 0000000000022000