Use struct sctp_assoc_value instead kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 9769 Comm: syz-executor7 Not tainted 4.15.0-rc4-mm1+ #47 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__fire_sched_out_preempt_notifiers kernel/sched/core.c:2550 [inline] RIP: 0010:fire_sched_out_preempt_notifiers kernel/sched/core.c:2558 [inline] RIP: 0010:prepare_task_switch kernel/sched/core.c:2594 [inline] RIP: 0010:context_switch kernel/sched/core.c:2765 [inline] RIP: 0010:__schedule+0xdf0/0x2060 kernel/sched/core.c:3376 RSP: 0018:ffff8801caf1f318 EFLAGS: 00010806 RAX: 1bd5a00000000022 RBX: ffff8801db32c900 RCX: ffffffff810caeaf RDX: 000000000000028d RSI: 0000000000000000 RDI: dead000000000110 RBP: ffff8801caf1f4e8 R08: 0000000000000000 R09: 1ffff100395e3e37 R10: ffff8801caf1f180 R11: 0000000000000001 R12: ffff8801aa4944c0 R13: dead000000000100 R14: dffffc0000000000 R15: ffff8801c4bd8080 FS: 00007efc298b8700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020e6af70 CR3: 00000001d2e58003 CR4: 00000000001626e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: schedule+0xf5/0x430 kernel/sched/core.c:3435 freezable_schedule include/linux/freezer.h:172 [inline] futex_wait_queue_me+0x3ed/0x7e0 kernel/futex.c:2476 futex_wait+0x34b/0x9a0 kernel/futex.c:2591 do_futex+0x11ec/0x22a0 kernel/futex.c:3473 SYSC_futex kernel/futex.c:3533 [inline] SyS_futex+0x260/0x390 kernel/futex.c:3501 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452a09 RSP: 002b:00007efc298b7ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452a09 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000071bec8 RBP: 00000000000001f1 R08: 0000000000000236 R09: 000000000071bea0 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006eff38 R13: 00000000ffffffff R14: 00007efc298b86d4 R15: 0000000000000000 Code: 08 4c 89 e8 48 c1 e8 03 42 80 3c 30 00 0f 85 ce 0f 00 00 4d 8b 6d 00 4d 85 ed 0f 84 72 f9 ff ff 49 8d 7d 10 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 74 ac eb a5 49 8d bc 24 28 04 00 00 48 b8 00 00 RIP: __fire_sched_out_preempt_notifiers kernel/sched/core.c:2550 [inline] RSP: ffff8801caf1f318 RIP: fire_sched_out_preempt_notifiers kernel/sched/core.c:2558 [inline] RSP: ffff8801caf1f318 RIP: prepare_task_switch kernel/sched/core.c:2594 [inline] RSP: ffff8801caf1f318 RIP: context_switch kernel/sched/core.c:2765 [inline] RSP: ffff8801caf1f318 RIP: __schedule+0xdf0/0x2060 kernel/sched/core.c:3376 RSP: ffff8801caf1f318 ====================================================== WARNING: possible circular locking dependency detected 4.15.0-rc4-mm1+ #47 Not tainted ------------------------------------------------------ syz-executor7/9769 is trying to acquire lock: ((console_sem).lock){-.-.}, at: [<000000000bdb862a>] down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 but task is already holding lock: (&rq->lock){-.-.}, at: [<00000000ca8f6f11>] rq_lock kernel/sched/sched.h:1766 [inline] (&rq->lock){-.-.}, at: [<00000000ca8f6f11>] __schedule+0x24e/0x2060 kernel/sched/core.c:3313 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #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:9448 sched_fork+0x435/0xc00 kernel/sched/core.c:2405 copy_process.part.37+0x1758/0x4b60 kernel/fork.c:1776 copy_process kernel/fork.c:1619 [inline] _do_fork+0x1f7/0xf70 kernel/fork.c:2100 kernel_thread+0x34/0x40 kernel/fork.c:2159 rest_init+0x22/0xf0 init/main.c:402 start_kernel+0x7f1/0x819 init/main.c:716 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:1989 wake_up_process+0x10/0x20 kernel/sched/core.c:2152 __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+0x538/0xd70 kernel/printk/printk.c:2248 con_install+0x33a/0x430 drivers/tty/vt/vt.c:2904 tty_driver_install_tty drivers/tty/tty_io.c:1215 [inline] tty_init_dev+0xf6/0x4a0 drivers/tty/tty_io.c:1315 tty_open_by_driver drivers/tty/tty_io.c:1944 [inline] tty_open+0x5fc/0xaa0 drivers/tty/tty_io.c:1992 chrdev_open+0x257/0x730 fs/char_dev.c:417 do_dentry_open+0x667/0xd40 fs/open.c:752 vfs_open+0x107/0x220 fs/open.c:866 do_last fs/namei.c:3397 [inline] path_openat+0x1151/0x3530 fs/namei.c:3537 do_filp_open+0x25b/0x3b0 fs/namei.c:3572 do_sys_open+0x502/0x6d0 fs/open.c:1059 SYSC_open fs/open.c:1077 [inline] SyS_open+0x2d/0x40 fs/open.c:1072 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 kasan_die_handler+0x31/0x3f arch/x86/mm/kasan_init_64.c:242 notifier_call_chain+0x136/0x2c0 kernel/notifier.c:93 __atomic_notifier_call_chain kernel/notifier.c:183 [inline] atomic_notifier_call_chain+0x77/0x140 kernel/notifier.c:193 notify_die+0x18c/0x280 kernel/notifier.c:549 do_general_protection+0x331/0x3e0 arch/x86/kernel/traps.c:557 general_protection+0x2c/0x60 arch/x86/entry/entry_64.S:1242 __fire_sched_out_preempt_notifiers kernel/sched/core.c:2550 [inline] fire_sched_out_preempt_notifiers kernel/sched/core.c:2558 [inline] prepare_task_switch kernel/sched/core.c:2594 [inline] context_switch kernel/sched/core.c:2765 [inline] __schedule+0xdf0/0x2060 kernel/sched/core.c:3376 schedule+0xf5/0x430 kernel/sched/core.c:3435 freezable_schedule include/linux/freezer.h:172 [inline] futex_wait_queue_me+0x3ed/0x7e0 kernel/futex.c:2476 futex_wait+0x34b/0x9a0 kernel/futex.c:2591 do_futex+0x11ec/0x22a0 kernel/futex.c:3473 SYSC_futex kernel/futex.c:3533 [inline] SyS_futex+0x260/0x390 kernel/futex.c:3501 entry_SYSCALL_64_fastpath+0x1f/0x96 other info that might help us debug this: Chain exists of: (console_sem).lock --> &p->pi_lock --> &rq->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->lock); lock(&p->pi_lock); lock(&rq->lock); lock((console_sem).lock); *** DEADLOCK *** 2 locks held by syz-executor7/9769: #0: (&rq->lock){-.-.}, at: [<00000000ca8f6f11>] rq_lock kernel/sched/sched.h:1766 [inline] #0: (&rq->lock){-.-.}, at: [<00000000ca8f6f11>] __schedule+0x24e/0x2060 kernel/sched/core.c:3313 #1: (rcu_read_lock){....}, at: [<0000000025f0de4a>] rcu_read_unlock include/linux/rcupdate.h:682 [inline] #1: (rcu_read_lock){....}, at: [<0000000025f0de4a>] atomic_notifier_call_chain+0x0/0x140 kernel/notifier.c:184 stack backtrace: CPU: 1 PID: 9769 Comm: syz-executor7 Not tainted 4.15.0-rc4-mm1+ #47 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 kasan_die_handler+0x31/0x3f arch/x86/mm/kasan_init_64.c:242 notifier_call_chain+0x136/0x2c0 kernel/notifier.c:93 __atomic_notifier_call_chain kernel/notifier.c:183 [inline] atomic_notifier_call_chain+0x77/0x140 kernel/notifier.c:193 notify_die+0x18c/0x280 kernel/notifier.c:549 do_general_protection+0x331/0x3e0 arch/x86/kernel/traps.c:557 general_protection+0x2c/0x60 arch/x86/entry/entry_64.S:1242 RIP: 0010:__fire_sched_out_preempt_notifiers kernel/sched/core.c:2550 [inline] RIP: 0010:fire_sched_out_preempt_notifiers kernel/sched/core.c:2558 [inline] RIP: 0010:prepare_task_switch kernel/sched/core.c:2594 [inline] RIP: 0010:context_switch kernel/sched/core.c:2765 [inline] RIP: 0010:__schedule+0xdf0/0x2060 kernel/sched/core.c:3376 RSP: 0018:ffff8801caf1f318 EFLAGS: 00010806 RAX: 1bd5a00000000022 RBX: ffff8801db32c900 RCX: ffffffff810caeaf RDX: 000000000000028d RSI: 0000000000000000 RDI: dead000000000110 RBP: ffff8801caf1f4e8 R08: 0000000000000000 R09: 1ffff100395e3e37 R10: ffff8801caf1f180 R11: 0000000000000001 R12: ffff8801aa4944c0 R13: dead000000000100 R14: dffffc0000000000 R15: ffff8801c4bd8080 schedule+0xf5/0x430 kernel/sched/core.c:3435 freezable_schedule include/linux/freezer.h:172 [inline] futex_wait_queue_me+0x3ed/0x7e0 kernel/futex.c:2476 futex_wait+0x34b/0x9a0 kernel/futex.c:2591 do_futex+0x11ec/0x22a0 kernel/futex.c:3473 SYSC_futex kernel/futex.c:3533 [inline] SyS_futex+0x260/0x390 kernel/futex.c:3501 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452a09 RSP: 002b:00007efc298b7ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452a09 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000071bec8 RBP: 00000000000001f1 R08: 0000000000000236 R09: 000000000071bea0 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006eff38 R13: 00000000ffffffff R14: 00007efc298b86d4 R15: 0000000000000000 ---[ end trace ce5c799e1149d0db ]---