Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor4 (pid 12483) Use of int in maxseg socket option. Use struct sctp_assoc_value instead ------------[ cut here ]------------ ODEBUG: free active (active state 0) object type: work_struct hint: strp_work+0x0/0xf0 net/strparser/strparser.c:381 WARNING: CPU: 1 PID: 3502 at lib/debugobjects.c:291 debug_print_object+0x166/0x220 lib/debugobjects.c:288 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 3502 Comm: kworker/u4:4 Not tainted 4.15.0-rc5+ #170 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kkcmd kcm_tx_work Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 panic+0x1e4/0x41c kernel/panic.c:183 __warn+0x1dc/0x200 kernel/panic.c:547 report_bug+0x211/0x2d0 lib/bug.c:184 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178 fixup_bug arch/x86/kernel/traps.c:247 [inline] do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1061 RIP: 0010:debug_print_object+0x166/0x220 lib/debugobjects.c:288 RSP: 0018:ffff8801c0ee7068 EFLAGS: 00010086 RAX: dffffc0000000008 RBX: 0000000000000003 RCX: ffffffff8159bc3e RDX: 0000000000000000 RSI: 1ffff100381dcdc8 RDI: ffff8801db317dd0 RBP: ffff8801c0ee70a8 R08: 0000000000000000 R09: 1ffff100381dcd9a R10: ffffed00381dce3c R11: ffffffff86137ad8 R12: 0000000000000001 R13: ffffffff86113480 R14: ffffffff8560dc40 R15: ffffffff8146e5f0 __debug_check_no_obj_freed lib/debugobjects.c:745 [inline] debug_check_no_obj_freed+0x662/0xf1f lib/debugobjects.c:774 kmem_cache_free+0x253/0x2a0 mm/slab.c:3745 unreserve_psock+0x5a1/0x780 net/kcm/kcmsock.c:547 kcm_write_msgs+0xbae/0x1b80 net/kcm/kcmsock.c:590 kcm_tx_work+0x2e/0x190 net/kcm/kcmsock.c:731 process_one_work+0xbbf/0x1b10 kernel/workqueue.c:2112 worker_thread+0x223/0x1990 kernel/workqueue.c:2246 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:515 ====================================================== WARNING: possible circular locking dependency detected 4.15.0-rc5+ #170 Not tainted ------------------------------------------------------ kworker/u4:4/3502 is trying to acquire lock: ((console_sem).lock){-.-.}, at: [<0000000091214b42>] down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 but task is already holding lock: (&obj_hash[i].lock){-.-.}, at: [<00000000da143489>] __debug_check_no_obj_freed lib/debugobjects.c:736 [inline] (&obj_hash[i].lock){-.-.}, at: [<00000000da143489>] debug_check_no_obj_freed+0x1e9/0xf1f lib/debugobjects.c:774 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+0x109/0x1040 lib/debugobjects.c:343 debug_object_init+0x17/0x20 lib/debugobjects.c:391 debug_hrtimer_init kernel/time/hrtimer.c:396 [inline] debug_init kernel/time/hrtimer.c:441 [inline] hrtimer_init+0x8c/0x410 kernel/time/hrtimer.c:1122 init_dl_task_timer+0x1b/0x50 kernel/sched/deadline.c:1023 __sched_fork+0x2c4/0xb70 kernel/sched/core.c:2188 init_idle+0x75/0x820 kernel/sched/core.c:5279 sched_init+0xb19/0xc43 kernel/sched/core.c:5976 start_kernel+0x452/0x819 init/main.c:582 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378 x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:359 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237 -> #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:1766 [inline] task_fork_fair+0x7a/0x690 kernel/sched/fair.c:9449 sched_fork+0x435/0xc00 kernel/sched/core.c:2404 copy_process.part.38+0x174b/0x4b20 kernel/fork.c:1722 copy_process kernel/fork.c:1565 [inline] _do_fork+0x1f7/0xfe0 kernel/fork.c:2044 kernel_thread+0x34/0x40 kernel/fork.c:2106 rest_init+0x22/0xf0 init/main.c:401 start_kernel+0x7f1/0x819 init/main.c:713 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378 x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:359 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237 -> #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+0xbc/0x1600 kernel/sched/core.c:1988 wake_up_process+0x10/0x20 kernel/sched/core.c:2151 __up.isra.0+0x1cc/0x2c0 kernel/locking/semaphore.c:262 up+0x13b/0x1d0 kernel/locking/semaphore.c:187 __up_console_sem+0xb2/0x1a0 kernel/printk/printk.c:245 console_unlock+0x538/0xd80 kernel/printk/printk.c:2248 do_con_write+0x106e/0x1f70 drivers/tty/vt/vt.c:2433 con_write+0x25/0xb0 drivers/tty/vt/vt.c:2782 do_output_char+0x4d9/0x7a0 drivers/tty/n_tty.c:431 process_output drivers/tty/n_tty.c:498 [inline] n_tty_write+0x68d/0xec0 drivers/tty/n_tty.c:2314 do_tty_write drivers/tty/tty_io.c:949 [inline] tty_write+0x3fa/0x840 drivers/tty/tty_io.c:1033 __vfs_write+0xef/0x970 fs/read_write.c:480 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x1f/0x96 -> #0 ((console_sem).lock){-.-.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3914 __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+0xa2/0x1e0 kernel/printk/printk.c:228 console_trylock+0x15/0x100 kernel/printk/printk.c:2065 vprintk_emit+0x49b/0x590 kernel/printk/printk.c:1756 vprintk_default+0x28/0x30 kernel/printk/printk.c:1796 vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379 printk+0xaa/0xca kernel/printk/printk.c:1829 __warn_printk+0x90/0xf0 kernel/panic.c:599 debug_print_object+0x166/0x220 lib/debugobjects.c:288 __debug_check_no_obj_freed lib/debugobjects.c:745 [inline] debug_check_no_obj_freed+0x662/0xf1f lib/debugobjects.c:774 kmem_cache_free+0x253/0x2a0 mm/slab.c:3745 unreserve_psock+0x5a1/0x780 net/kcm/kcmsock.c:547 kcm_write_msgs+0xbae/0x1b80 net/kcm/kcmsock.c:590 kcm_tx_work+0x2e/0x190 net/kcm/kcmsock.c:731 process_one_work+0xbbf/0x1b10 kernel/workqueue.c:2112 worker_thread+0x223/0x1990 kernel/workqueue.c:2246 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:515 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 *** 5 locks held by kworker/u4:4/3502: #0: ((wq_completion)"%s""kkcmd"){+.+.}, at: [<0000000030be6056>] process_one_work+0xaaf/0x1b10 kernel/workqueue.c:2083 #1: ((work_completion)(&kcm->tx_work)){+.+.}, at: [<0000000019ffb03c>] process_one_work+0xb01/0x1b10 kernel/workqueue.c:2087 #2: (sk_lock-AF_KCM){+.+.}, at: [<0000000077d44615>] lock_sock include/net/sock.h:1462 [inline] #2: (sk_lock-AF_KCM){+.+.}, at: [<0000000077d44615>] kcm_tx_work+0x26/0x190 net/kcm/kcmsock.c:726 #3: (&(&mux->lock)->rlock){+...}, at: [<00000000c908a2e7>] spin_lock_bh include/linux/spinlock.h:315 [inline] #3: (&(&mux->lock)->rlock){+...}, at: [<00000000c908a2e7>] unreserve_psock+0x9e/0x780 net/kcm/kcmsock.c:521 #4: (&obj_hash[i].lock){-.-.}, at: [<00000000da143489>] __debug_check_no_obj_freed lib/debugobjects.c:736 [inline] #4: (&obj_hash[i].lock){-.-.}, at: [<00000000da143489>] debug_check_no_obj_freed+0x1e9/0xf1f lib/debugobjects.c:774 stack backtrace: CPU: 1 PID: 3502 Comm: kworker/u4:4 Not tainted 4.15.0-rc5+ #170 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kkcmd kcm_tx_work Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_circular_bug.isra.37+0x2cd/0x2dc kernel/locking/lockdep.c:1218 check_prev_add kernel/locking/lockdep.c:1858 [inline] check_prevs_add kernel/locking/lockdep.c:1971 [inline] validate_chain kernel/locking/lockdep.c:2412 [inline] __lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3426 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3914 __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+0xa2/0x1e0 kernel/printk/printk.c:228 console_trylock+0x15/0x100 kernel/printk/printk.c:2065 vprintk_emit+0x49b/0x590 kernel/printk/printk.c:1756 vprintk_default+0x28/0x30 kernel/printk/printk.c:1796 vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379 printk+0xaa/0xca kernel/printk/printk.c:1829 __warn_printk+0x90/0xf0 kernel/panic.c:599 debug_print_object+0x166/0x220 lib/debugobjects.c:288 __debug_check_no_obj_freed lib/debugobjects.c:745 [inline] debug_check_no_obj_freed+0x662/0xf1f lib/debugobjects.c:774 kmem_cache_free+0x253/0x2a0 mm/slab.c:3745 unreserve_psock+0x5a1/0x780 net/kcm/kcmsock.c:547 kcm_write_msgs+0xbae/0x1b80 net/kcm/kcmsock.c:590 kcm_tx_work+0x2e/0x190 net/kcm/kcmsock.c:731 process_one_work+0xbbf/0x1b10 kernel/workqueue.c:2112 worker_thread+0x223/0x1990 kernel/workqueue.c:2246 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:515 Shutting down cpus with NMI Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..