------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: work_struct hint: smc_tcp_listen_work+0x0/0xec0 net/smc/af_smc.c:1014
WARNING: CPU: 0 PID: 9815 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 lib/debugobjects.c:326
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 9815 Comm: syz-executor7 Not tainted 4.17.0-rc2+ #23
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 panic+0x22f/0x4de kernel/panic.c:184
 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:debug_print_object+0x16a/0x210 lib/debugobjects.c:326
RSP: 0018:ffff88019790ecf0 EFLAGS: 00010082
RAX: 0000000000000061 RBX: 0000000000000003 RCX: ffffffff818433e8
RDX: 0000000000000000 RSI: ffffffff8160f561 RDI: 0000000000000001
RBP: ffff88019790ed30 R08: ffff8801aced62c0 R09: ffffed003b5c3eb2
R10: ffffed003b5c3eb2 R11: ffff8801dae1f597 R12: 0000000000000001
R13: ffffffff88d5f700 R14: ffffffff87fa3340 R15: ffffffff814ccec0
 __debug_check_no_obj_freed lib/debugobjects.c:783 [inline]
 debug_check_no_obj_freed+0x3a6/0x584 lib/debugobjects.c:815
 kmem_cache_free+0x216/0x2d0 mm/slab.c:3755
 sk_prot_free net/core/sock.c:1512 [inline]
 __sk_destruct+0x6fe/0xa40 net/core/sock.c:1596
 sk_destruct+0x78/0x90 net/core/sock.c:1604
 __sk_free+0x22e/0x340 net/core/sock.c:1615
 sk_free+0x42/0x50 net/core/sock.c:1626
 sock_put include/net/sock.h:1664 [inline]
 smc_release+0x459/0x610 net/smc/af_smc.c:162
 sock_release+0x96/0x1b0 net/socket.c:594
 sock_close+0x16/0x20 net/socket.c:1149
 __fput+0x34d/0x890 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1e4/0x290 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1aee/0x2730 kernel/exit.c:865
 do_group_exit+0x16f/0x430 kernel/exit.c:968
 get_signal+0x886/0x1960 kernel/signal.c:2469
 do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455979
RSP: 002b:00007f6e1a1b9ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bec8 RCX: 0000000000455979
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bec8
RBP: 000000000072bec8 R08: 0000000000000000 R09: 000000000072bea0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a3e81f R14: 00007f6e1a1ba9c0 R15: 0000000000000000

======================================================
WARNING: possible circular locking dependency detected
4.17.0-rc2+ #23 Not tainted
------------------------------------------------------
syz-executor7/9815 is trying to acquire lock:
        (ptrval) ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136

but task is already holding lock:
        (ptrval) (&obj_hash[i].lock){-.-.}, at: __debug_check_no_obj_freed lib/debugobjects.c:774 [inline]
        (ptrval) (&obj_hash[i].lock){-.-.}, at: debug_check_no_obj_freed+0x159/0x584 lib/debugobjects.c:815

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&obj_hash[i].lock){-.-.}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
       __debug_object_init+0x11f/0x12c0 lib/debugobjects.c:381
       debug_object_init+0x16/0x20 lib/debugobjects.c:429
       debug_hrtimer_init kernel/time/hrtimer.c:400 [inline]
       debug_init kernel/time/hrtimer.c:448 [inline]
       hrtimer_init+0x8f/0x460 kernel/time/hrtimer.c:1296
       init_dl_task_timer+0x1b/0x50 kernel/sched/deadline.c:1056
       __sched_fork+0x2ae/0xc20 kernel/sched/core.c:2163
       init_idle+0x75/0x7a0 kernel/sched/core.c:5406
       sched_init+0xbeb/0xd10 kernel/sched/core.c:6104
       start_kernel+0x475/0x92d init/main.c:601
       x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:445
       x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:426
       secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242

-> #2 (&rq->lock){-.-.}:
       __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
       _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144
       rq_lock kernel/sched/sched.h:1799 [inline]
       task_fork_fair+0x8a/0x660 kernel/sched/fair.c:9967
       sched_fork+0x43e/0xb30 kernel/sched/core.c:2379
       copy_process.part.38+0x1c13/0x6e90 kernel/fork.c:1764
       copy_process kernel/fork.c:1607 [inline]
       _do_fork+0x291/0x12a0 kernel/fork.c:2088
       kernel_thread+0x34/0x40 kernel/fork.c:2147
       rest_init+0x22/0xe4 init/main.c:407
       start_kernel+0x906/0x92d init/main.c:737
       x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:445
       x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:426
       secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242

-> #1 (&p->pi_lock){-.-.}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
       try_to_wake_up+0xca/0x1190 kernel/sched/core.c:1963
       wake_up_process+0x10/0x20 kernel/sched/core.c:2126
       __up.isra.1+0x1b8/0x290 kernel/locking/semaphore.c:262
       up+0x12f/0x1b0 kernel/locking/semaphore.c:187
       __up_console_sem+0xbe/0x1b0 kernel/printk/printk.c:242
       console_unlock+0x7d6/0x1100 kernel/printk/printk.c:2417
       vprintk_emit+0x6ad/0xdd0 kernel/printk/printk.c:1907
       vprintk_default+0x28/0x30 kernel/printk/printk.c:1947
       vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:379
       printk+0x9e/0xba kernel/printk/printk.c:1980
       regdb_fw_cb.cold.35+0x18/0x89 net/wireless/reg.c:1074
       request_firmware_work_func+0x154/0x2c0 drivers/base/firmware_loader/main.c:749
       process_one_work+0xc1e/0x1b50 kernel/workqueue.c:2145
       worker_thread+0x1cc/0x1440 kernel/workqueue.c:2279
       kthread+0x345/0x410 kernel/kthread.c:238
       ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412

-> #0 ((console_sem).lock){-.-.}:
       lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
       down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
       __down_trylock_console_sem+0xae/0x200 kernel/printk/printk.c:225
       console_trylock+0x15/0xa0 kernel/printk/printk.c:2229
       console_trylock_spinning kernel/printk/printk.c:1643 [inline]
       vprintk_emit+0x694/0xdd0 kernel/printk/printk.c:1906
       vprintk_default+0x28/0x30 kernel/printk/printk.c:1947
       vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:379
       printk+0x9e/0xba kernel/printk/printk.c:1980
       __warn_printk+0x83/0xd0 kernel/panic.c:590
       debug_print_object+0x16a/0x210 lib/debugobjects.c:326
       __debug_check_no_obj_freed lib/debugobjects.c:783 [inline]
       debug_check_no_obj_freed+0x3a6/0x584 lib/debugobjects.c:815
       kmem_cache_free+0x216/0x2d0 mm/slab.c:3755
       sk_prot_free net/core/sock.c:1512 [inline]
       __sk_destruct+0x6fe/0xa40 net/core/sock.c:1596
       sk_destruct+0x78/0x90 net/core/sock.c:1604
       __sk_free+0x22e/0x340 net/core/sock.c:1615
       sk_free+0x42/0x50 net/core/sock.c:1626
       sock_put include/net/sock.h:1664 [inline]
       smc_release+0x459/0x610 net/smc/af_smc.c:162
       sock_release+0x96/0x1b0 net/socket.c:594
       sock_close+0x16/0x20 net/socket.c:1149
       __fput+0x34d/0x890 fs/file_table.c:209
       ____fput+0x15/0x20 fs/file_table.c:243
       task_work_run+0x1e4/0x290 kernel/task_work.c:113
       exit_task_work include/linux/task_work.h:22 [inline]
       do_exit+0x1aee/0x2730 kernel/exit.c:865
       do_group_exit+0x16f/0x430 kernel/exit.c:968
       get_signal+0x886/0x1960 kernel/signal.c:2469
       do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810
       exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162
       prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
       syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
       do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Chain exists of:
  (console_sem).lock --> &rq->lock --> &obj_hash[i].lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&obj_hash[i].lock);
                               lock(&rq->lock);
                               lock(&obj_hash[i].lock);
  lock((console_sem).lock);

 *** DEADLOCK ***

1 lock held by syz-executor7/9815:
 #0:         (ptrval) (&obj_hash[i].lock){-.-.}, at: __debug_check_no_obj_freed lib/debugobjects.c:774 [inline]
 #0:         (ptrval) (&obj_hash[i].lock){-.-.}, at: debug_check_no_obj_freed+0x159/0x584 lib/debugobjects.c:815

stack backtrace:
CPU: 0 PID: 9815 Comm: syz-executor7 Not tainted 4.17.0-rc2+ #23
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 print_circular_bug.isra.36.cold.54+0x1bd/0x27d kernel/locking/lockdep.c:1223
 check_prev_add kernel/locking/lockdep.c:1863 [inline]
 check_prevs_add kernel/locking/lockdep.c:1976 [inline]
 validate_chain kernel/locking/lockdep.c:2417 [inline]
 __lock_acquire+0x343e/0x5140 kernel/locking/lockdep.c:3431
 lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
 __down_trylock_console_sem+0xae/0x200 kernel/printk/printk.c:225
 console_trylock+0x15/0xa0 kernel/printk/printk.c:2229
 console_trylock_spinning kernel/printk/printk.c:1643 [inline]
 vprintk_emit+0x694/0xdd0 kernel/printk/printk.c:1906
 vprintk_default+0x28/0x30 kernel/printk/printk.c:1947
 vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:379
 printk+0x9e/0xba kernel/printk/printk.c:1980
 __warn_printk+0x83/0xd0 kernel/panic.c:590
 debug_print_object+0x16a/0x210 lib/debugobjects.c:326
 __debug_check_no_obj_freed lib/debugobjects.c:783 [inline]
 debug_check_no_obj_freed+0x3a6/0x584 lib/debugobjects.c:815
 kmem_cache_free+0x216/0x2d0 mm/slab.c:3755
 sk_prot_free net/core/sock.c:1512 [inline]
 __sk_destruct+0x6fe/0xa40 net/core/sock.c:1596
 sk_destruct+0x78/0x90 net/core/sock.c:1604
 __sk_free+0x22e/0x340 net/core/sock.c:1615
 sk_free+0x42/0x50 net/core/sock.c:1626
 sock_put include/net/sock.h:1664 [inline]
 smc_release+0x459/0x610 net/smc/af_smc.c:162
 sock_release+0x96/0x1b0 net/socket.c:594
 sock_close+0x16/0x20 net/socket.c:1149
 __fput+0x34d/0x890 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1e4/0x290 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1aee/0x2730 kernel/exit.c:865
 do_group_exit+0x16f/0x430 kernel/exit.c:968
 get_signal+0x886/0x1960 kernel/signal.c:2469
 do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810
 ? lock_dow
Lost 26 message(s)!
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..