====================================================== WARNING: possible circular locking dependency detected 4.17.0-rc2+ #22 Not tainted ------------------------------------------------------ syz-executor7/10017 is trying to acquire lock: (ptrval) (sk_lock-AF_INET6){+.+.}, at: lock_sock include/net/sock.h:1469 [inline] (ptrval) (sk_lock-AF_INET6){+.+.}, at: tcp_mmap+0x1c7/0x14f0 net/ipv4/tcp.c:1759 but task is already holding lock: (ptrval) (&mm->mmap_sem){++++}, at: vm_mmap_pgoff+0x1a1/0x2a0 mm/util.c:355 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&mm->mmap_sem){++++}: __might_fault+0x155/0x1e0 mm/memory.c:4555 sctp_getsockopt_recvnxtinfo net/sctp/socket.c:6768 [inline] sctp_getsockopt+0xaff/0x7b4b net/sctp/socket.c:7341 sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:3001 __sys_getsockopt+0x1a5/0x370 net/socket.c:1940 __do_sys_getsockopt net/socket.c:1951 [inline] __se_sys_getsockopt net/socket.c:1948 [inline] __x64_sys_getsockopt+0xbe/0x150 net/socket.c:1948 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (sk_lock-AF_INET6){+.+.}: lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 lock_sock_nested+0xd0/0x120 net/core/sock.c:2844 lock_sock include/net/sock.h:1469 [inline] tcp_mmap+0x1c7/0x14f0 net/ipv4/tcp.c:1759 sock_mmap+0x8e/0xc0 net/socket.c:1144 call_mmap include/linux/fs.h:1789 [inline] mmap_region+0xd13/0x1820 mm/mmap.c:1723 do_mmap+0xc79/0x11d0 mm/mmap.c:1494 do_mmap_pgoff include/linux/mm.h:2237 [inline] vm_mmap_pgoff+0x1fb/0x2a0 mm/util.c:357 ksys_mmap_pgoff+0x4c9/0x640 mm/mmap.c:1544 BUG: sleeping function called from invalid context at mm/slab.h:421 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91 in_atomic(): 1, irqs_disabled(): 1, pid: 4522, name: syz-fuzzer do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 INFO: lockdep is turned off. entry_SYSCALL_64_after_hwframe+0x49/0xbe irq event stamp: 174374 other info that might help us debug this: hardirqs last enabled at (174373): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (174373): [] _raw_spin_unlock_irqrestore+0x74/0xc0 kernel/locking/spinlock.c:184 Possible unsafe locking scenario: hardirqs last disabled at (174374): [] __schedule+0x22d/0x1e30 kernel/sched/core.c:3417 CPU0 CPU1 softirqs last enabled at (174368): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 ---- ---- softirqs last disabled at (174361): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (174361): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 lock( CPU: 1 PID: 4522 Comm: syz-fuzzer Not tainted 4.17.0-rc2+ #22 &mm->mmap_sem); Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 lock( Call Trace: sk_lock-AF_INET6 ); __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 lock( &mm->mmap_sem ); lock( sk_lock-AF_INET6); ___might_sleep.cold.87+0x11f/0x13a kernel/sched/core.c:6188 *** DEADLOCK *** 1 lock held by syz-executor7/10017: #0: __might_sleep+0x95/0x190 kernel/sched/core.c:6141 (ptrval) slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3378 [inline] __do_kmalloc mm/slab.c:3716 [inline] __kmalloc+0x2b9/0x760 mm/slab.c:3727 ( &mm->mmap_sem ){++++} , at: vm_mmap_pgoff+0x1a1/0x2a0 mm/util.c:355 kmalloc_array include/linux/slab.h:631 [inline] kcalloc include/linux/slab.h:642 [inline] numa_crng_init drivers/char/random.c:798 [inline] crng_reseed+0x427/0x920 drivers/char/random.c:923 stack backtrace: credit_entropy_bits+0x98d/0xa30 drivers/char/random.c:708 add_interrupt_randomness+0x494/0x860 drivers/char/random.c:1254 handle_irq_event_percpu+0xf9/0x1c0 kernel/irq/handle.c:191 handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206 handle_edge_irq+0x20f/0x870 kernel/irq/chip.c:791 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline] handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:77 do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642 RIP: 0010:arch_local_irq_enable arch/x86/include/asm/paravirt.h:793 [inline] RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] RIP: 0010:_raw_spin_unlock_irq+0x56/0x70 kernel/locking/spinlock.c:192 RSP: 0018:ffff8801ad85ef38 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffd8 RAX: dffffc0000000000 RBX: ffff8801daf2c580 RCX: ffffffff815e077e RDX: 1ffffffff11a315f RSI: 0000000000000004 RDI: ffffffff88d18af8 RBP: ffff8801ad85ef40 R08: ffffed003b5e58b1 R09: ffffed003b5e58b0 R10: ffffed003b5e58b0 R11: ffff8801daf2c583 R12: ffff8801adb764c0 R13: ffff8801af7a0080 R14: 0000000000000000 R15: ffff8801adb764c0 finish_lock_switch kernel/sched/core.c:2603 [inline] finish_task_switch+0x1ca/0x810 kernel/sched/core.c:2701 context_switch kernel/sched/core.c:2851 [inline] __schedule+0x809/0x1e30 kernel/sched/core.c:3490 schedule+0xef/0x430 kernel/sched/core.c:3549 schedule_hrtimeout_range_clock+0x237/0x470 kernel/time/hrtimer.c:1932 schedule_hrtimeout_range+0x2a/0x40 kernel/time/hrtimer.c:1977 poll_schedule_timeout+0x11a/0x200 fs/select.c:243 do_select+0x1606/0x1ae0 fs/select.c:581 core_sys_select+0x768/0xb60 fs/select.c:655 do_pselect+0x42f/0x4d0 fs/select.c:736 __do_sys_pselect6 fs/select.c:777 [inline] __se_sys_pselect6 fs/select.c:762 [inline] __x64_sys_pselect6+0x1f7/0x280 fs/select.c:762 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d911 RSP: 002b:000000c420035f18 EFLAGS: 00000246 ORIG_RAX: 000000000000010e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045d911 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000c420035f28 R08: 000000c420035f18 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000430130 R13: 00000000000000f1 R14: 0000000000000011 R15: 0000000000000000 CPU: 0 PID: 10017 Comm: syz-executor7 Not tainted 4.17.0-rc2+ #22 random: crng init done 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 lock_sock_nested+0xd0/0x120 net/core/sock.c:2844 lock_sock include/net/sock.h:1469 [inline] tcp_mmap+0x1c7/0x14f0 net/ipv4/tcp.c:1759 sock_mmap+0x8e/0xc0 net/socket.c:1144 call_mmap include/linux/fs.h:1789 [inline] mmap_region+0xd13/0x1820 mm/mmap.c:1723 do_mmap+0xc79/0x11d0 mm/mmap.c:1494 do_mmap_pgoff include/linux/mm.h:2237 [inline] vm_mmap_pgoff+0x1fb/0x2a0 mm/util.c:357 ksys_mmap_pgoff+0x4c9/0x640 mm/mmap.c:1544 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455979 RSP: 002b:00007f582f23fc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f582f2406d4 RCX: 0000000000455979 RDX: 0000000000000000 RSI: 0000000000002000 RDI: 0000000020ffd000 RBP: 000000000072bea0 R08: 0000000000000013 R09: 0000000000000000 R10: 0000000000002811 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000003fe R14: 00000000006f9070 R15: 0000000000000000 kernel msg: ebtables bug: please report to author: bad policy kernel msg: ebtables bug: please report to author: bad policy netlink: 28 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 28 bytes leftover after parsing attributes in process `syz-executor4'. IPVS: set_ctl: invalid protocol: 54 0.0.3.255:20002 rr syz_tun: refused to change device tx_queue_len syz_tun: refused to change device tx_queue_len IPVS: set_ctl: invalid protocol: 54 0.0.3.255:20002 rr RDS: rds_bind could not find a transport for 255.255.255.255, load rds_tcp or rds_rdma? RDS: rds_bind could not find a transport for 255.255.255.255, load rds_tcp or rds_rdma? netlink: 20 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 20 bytes leftover after parsing attributes in process `syz-executor1'. TCP: request_sock_TCPv6: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. kernel msg: ebtables bug: please report to author: counter_offset != totalcnt kernel msg: ebtables bug: please report to author: counter_offset != totalcnt x_tables: duplicate underflow at hook 4 x_tables: duplicate underflow at hook 4 l2tp_ppp: tunl 59: set debug=f55d40e