------------[ cut here ]------------ ODEBUG: free active (active state 0) object type: work_struct hint: smc_tx_work+0x0/0x350 include/linux/compiler.h:188 WARNING: CPU: 0 PID: 5254 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: 5254 Comm: syz-executor351 Not tainted 4.17.0-rc6+ #64 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:ffff8801c6f67158 EFLAGS: 00010082 RAX: 0000000000000059 RBX: 0000000000000003 RCX: ffffffff818435f8 RDX: 0000000000000000 RSI: ffffffff8160f2c1 RDI: 0000000000000001 RBP: ffff8801c6f67198 R08: ffff8801cb640580 R09: ffffed003b5c3eb2 R10: ffffed003b5c3eb2 R11: ffff8801dae1f597 R12: 0000000000000001 R13: ffffffff88d5f040 R14: ffffffff87fa2a00 R15: ffffffff814ccb10 __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:1516 [inline] __sk_destruct+0x6fe/0xa40 net/core/sock.c:1600 sk_destruct+0x78/0x90 net/core/sock.c:1608 __sk_free+0xcf/0x300 net/core/sock.c:1619 sk_free+0x42/0x50 net/core/sock.c:1630 sock_put include/net/sock.h:1669 [inline] smc_release+0x459/0x610 net/smc/af_smc.c:156 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 __do_sys_exit_group kernel/exit.c:979 [inline] __se_sys_exit_group kernel/exit.c:977 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:977 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4424f9 RSP: 002b:00007ffcbea55c78 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00000000000002c0 RCX: 00000000004424f9 RDX: 00000000004424f9 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 00007ffcbea55db0 R08: 0000000300000000 R09: 00007ffcbea55cc0 R10: 0000000000000004 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000001380 R15: 00007ffcbea55dd8 ====================================================== WARNING: possible circular locking dependency detected 4.17.0-rc6+ #64 Not tainted ------------------------------------------------------ syz-executor351/5254 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:410 [inline] debug_init kernel/time/hrtimer.c:458 [inline] hrtimer_init+0x8f/0x460 kernel/time/hrtimer.c:1308 init_dl_task_timer+0x1b/0x50 kernel/sched/deadline.c:1056 __sched_fork+0x2ae/0xc20 kernel/sched/core.c:2166 init_idle+0x75/0x7a0 kernel/sched/core.c:5402 sched_init+0xbeb/0xd10 kernel/sched/core.c:6100 start_kernel+0x475/0x92d init/main.c:601 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:453 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:434 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:9912 sched_fork+0x43e/0xb30 kernel/sched/core.c:2382 copy_process.part.38+0x1c18/0x6e90 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:453 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:434 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:1966 wake_up_process+0x10/0x20 kernel/sched/core.c:2129 __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 do_con_write+0x12b2/0x2280 drivers/tty/vt/vt.c:2437 con_write+0x25/0xc0 drivers/tty/vt/vt.c:2786 process_output_block drivers/tty/n_tty.c:579 [inline] n_tty_write+0x6b9/0x1180 drivers/tty/n_tty.c:2308 do_tty_write drivers/tty/tty_io.c:958 [inline] tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042 __vfs_write+0x10b/0x960 fs/read_write.c:485 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #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:1516 [inline] __sk_destruct+0x6fe/0xa40 net/core/sock.c:1600 sk_destruct+0x78/0x90 net/core/sock.c:1608 __sk_free+0xcf/0x300 net/core/sock.c:1619 sk_free+0x42/0x50 net/core/sock.c:1630 sock_put include/net/sock.h:1669 [inline] smc_release+0x459/0x610 net/smc/af_smc.c:156 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 __do_sys_exit_group kernel/exit.c:979 [inline] __se_sys_exit_group kernel/exit.c:977 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:977 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 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-executor351/5254: #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: 5254 Comm: syz-executor351 Not tainted 4.17.0-rc6+ #64 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:1516 [inline] __sk_destruct+0x6fe/0xa40 net/core/sock.c:1600 sk_destruct+0x78/0x90 net/core/sock.c:1608 __sk_free+0xcf/0x300 net/core/sock.c:1619 sk_free+0x42/0x50 net/core/sock.c:1630 sock_put include/net/sock.h:1669 [inline] smc_release+0x459/0x610 net/smc/af_smc.c:156 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 __do_sys_exit_group kernel/exit.c:979 [inline] __se_sys_exit_group kernel/exit.c:977 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:977 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4424f9 RSP: 002b:00007ffcbea55c78 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00000000000002c0 RCX: 00000000004424f9 RDX: 00000000004424f9 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 00007ffcbea55db0 R08: 000000030 Lost 2 message(s)! Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..