INFO: task syz-executor.4:2409 blocked for more than 143 seconds. Not tainted 5.7.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27504 2409 7546 0x20024004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x937/0x1ff0 kernel/sched/core.c:4083 __sched_text_start+0x8/0x8 schedule+0xd0/0x2a0 kernel/sched/core.c:4158 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 nfnl_lock net/netfilter/nfnetlink.c:62 [inline] nfnetlink_rcv_msg+0x9a6/0xf30 net/netfilter/nfnetlink.c:224 mutex_trylock+0x2c0/0x2c0 kernel/locking/mutex.c:126 find_held_lock+0x2d/0x110 kernel/locking/lockdep.c:4458 rcu_read_unlock include/linux/rcupdate.h:651 [inline] nfnetlink_rcv_msg+0x978/0xf30 net/netfilter/nfnetlink.c:223 nla_memcpy+0xa0/0xa0 lib/nlattr.c:572 nfnl_lock net/netfilter/nfnetlink.c:62 [inline] nfnetlink_rcv_msg+0x9a6/0xf30 net/netfilter/nfnetlink.c:224 nfnl_lock net/netfilter/nfnetlink.c:62 [inline] nfnetlink_rcv_msg+0x9a6/0xf30 net/netfilter/nfnetlink.c:224 nfnetlink_bind+0x2b0/0x2b0 include/linux/compiler.h:199 __kfree_skb net/core/skbuff.c:679 [inline] consume_skb net/core/skbuff.c:837 [inline] consume_skb+0xfb/0x400 net/core/skbuff.c:831 lock_downgrade+0x840/0x840 kernel/locking/lockdep.c:4579 nlmon_xmit+0x9d/0xd0 drivers/net/nlmon.c:14 __local_bh_enable_ip+0x159/0x270 kernel/softirq.c:194 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline] lockdep_hardirqs_on+0x463/0x620 kernel/locking/lockdep.c:3702 rcu_read_unlock_bh include/linux/rcupdate.h:686 [inline] __dev_queue_xmit+0x174a/0x30a0 net/core/dev.c:4079 __local_bh_enable_ip+0x159/0x270 kernel/softirq.c:194 __dev_queue_xmit+0xbf2/0x30a0 net/core/dev.c:4077 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 nfnetlink_bind+0x2b0/0x2b0 include/linux/compiler.h:199 netlink_ack+0xa10/0xa10 net/netlink/af_netlink.c:2426 ns_capable_common+0xe2/0x100 kernel/capability.c:378 nfnetlink_rcv+0x1ac/0x420 net/netfilter/nfnetlink.c:563 nfnetlink_rcv_batch+0x1610/0x1610 net/netfilter/nfnetlink.c:501 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_attachskb+0x810/0x810 net/netlink/af_netlink.c:1235 _copy_from_iter_full+0x25c/0x870 lib/iov_iter.c:800 __phys_addr_symbol+0x2c/0x70 arch/x86/mm/physaddr.c:42 overlaps mm/usercopy.c:110 [inline] check_kernel_text_object mm/usercopy.c:142 [inline] __check_object_size mm/usercopy.c:289 [inline] __check_object_size+0x171/0x437 mm/usercopy.c:256 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 aa_af_perm+0x260/0x260 security/apparmor/net.c:141 netlink_unicast+0x740/0x740 net/netlink/af_netlink.c:82 netlink_unicast+0x740/0x740 net/netlink/af_netlink.c:82 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362 get_compat_msghdr+0xd1/0x120 net/compat.c:102 kernel_sendmsg+0x50/0x50 net/socket.c:692 ___sys_sendmsg+0x100/0x170 net/socket.c:2416 sendmsg_copy_msghdr+0x70/0x70 net/socket.c:2391 rcu_lock_release include/linux/rcupdate.h:213 [inline] rcu_read_unlock include/linux/rcupdate.h:655 [inline] __fget_files+0x32f/0x500 fs/file.c:734 ksys_dup3+0x3c0/0x3c0 include/linux/compiler.h:199 __fget_light fs/file.c:804 [inline] __fget_light+0x20e/0x270 fs/file.c:790 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449 __sys_sendmsg_sock+0xb0/0xb0 net/socket.c:2429 __do_sys_futex_time32 kernel/futex.c:4057 [inline] __se_sys_futex_time32 kernel/futex.c:4031 [inline] __ia32_sys_futex_time32+0x32a/0x494 kernel/futex.c:4031 trace_hardirqs_off_caller+0x55/0x230 kernel/trace/trace_preemptirq.c:73 do_fast_syscall_32+0xcc/0xe90 arch/x86/entry/common.c:371 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline] do_fast_syscall_32+0x270/0xe90 arch/x86/entry/common.c:396 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 Showing all locks held in the system: 2 locks held by systemd/1: #0: ffff8880a27652d0 (&ei->i_mmap_sem){++++}-{3:3}, at: ext4_filemap_fault+0x7f/0xb6 fs/ext4/inode.c:6032 #1: ffffffff89a65b80 (fs_reclaim){+.+.}-{0:0}, at: fs_reclaim_acquire.part.0+0x0/0x30 include/linux/uaccess.h:173 1 lock held by khungtaskd/1132: #0: ffffffff899bea80 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754 1 lock held by kswapd1/1879: 2 locks held by systemd-journal/4095: #0: ffff8880981ad750 (&ei->i_mmap_sem){++++}-{3:3}, at: ext4_filemap_fault+0x7f/0xb6 fs/ext4/inode.c:6032 #1: ffffffff89a65b80 (fs_reclaim){+.+.}-{0:0}, at: fs_reclaim_acquire.part.0+0x0/0x30 include/linux/uaccess.h:173 1 lock held by systemd-udevd/4106: 3 locks held by in:imklog/6722: 2 locks held by agetty/6944: #0: ffff8880a9293098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc90000fc02e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x220/0x1b30 drivers/tty/n_tty.c:2156 2 locks held by syz-fuzzer/7036: #0: ffff88808a6b6490 (&ei->i_mmap_sem){++++}-{3:3}, at: ext4_filemap_fault+0x7f/0xb6 fs/ext4/inode.c:6032 #1: ffffffff89a65b80 (fs_reclaim){+.+.}-{0:0}, at: fs_reclaim_acquire.part.0+0x0/0x30 include/linux/uaccess.h:173 2 locks held by syz-fuzzer/7037: #0: ffff88808a6b6490 (&ei->i_mmap_sem){++++}-{3:3}, at: ext4_filemap_fault+0x7f/0xb6 fs/ext4/inode.c:6032 #1: ffffffff89a65b80 (fs_reclaim){+.+.}-{0:0}, at: fs_reclaim_acquire.part.0+0x0/0x30 include/linux/uaccess.h:173 1 lock held by syz-fuzzer/7040: #0: ffff88808a6b6490 (&ei->i_mmap_sem){++++}-{3:3}, at: ext4_filemap_fault+0x7f/0xb6 fs/ext4/inode.c:6032 2 locks held by syz-fuzzer/7041: #0: ffff88808a6b6490 (&ei->i_mmap_sem){++++}-{3:3}, at: ext4_filemap_fault+0x7f/0xb6 fs/ext4/inode.c:6032 #1: ffffffff89a65b80 (fs_reclaim){+.+.}-{0:0}, at: fs_reclaim_acquire.part.0+0x0/0x30 include/linux/uaccess.h:173 2 locks held by syz-fuzzer/7042: 4 locks held by kworker/u4:5/8778: #0: ffff888099cd9938 ((wq_completion)krdsd){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff888099cd9938 ((wq_completion)krdsd){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888099cd9938 ((wq_completion)krdsd){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff888099cd9938 ((wq_completion)krdsd){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff888099cd9938 ((wq_completion)krdsd){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff888099cd9938 ((wq_completion)krdsd){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff888099cd9938 ((wq_completion)krdsd){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 kernel/workqueue.c:2239 #1: ffffc90001f27dc0 ((work_completion)(&(&cp->cp_conn_w)->work)){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 kernel/workqueue.c:2243 #2: ffff888091ca4dd0 (&tc->t_conn_path_lock){+.+.}-{3:3}, at: rds_tcp_conn_path_connect+0x174/0x880 net/rds/tcp_connect.c:107 #3: ffffffff89a65b80 (fs_reclaim){+.+.}-{0:0}, at: fs_reclaim_acquire.part.0+0x0/0x30 include/linux/uaccess.h:173 5 locks held by kworker/u4:8/2369: 2 locks held by syz-executor.2/2403: #0: ffffffff8d2024d8 (&table[i].mutex){+.+.}-{3:3}, at: nfnl_lock net/netfilter/nfnetlink.c:62 [inline] #0: ffffffff8d2024d8 (&table[i].mutex){+.+.}-{3:3}, at: nfnetlink_rcv_msg+0x9a6/0xf30 net/netfilter/nfnetlink.c:224 #1: ffffffff89a65b80 (fs_reclaim){+.+.}-{0:0}, at: fs_reclaim_acquire.part.0+0x0/0x30 include/linux/uaccess.h:173 1 lock held by syz-executor.4/2409: #0: ffffffff8d2024d8 (&table[i].mutex){+.+.}-{3:3}, at: nfnl_lock net/netfilter/nfnetlink.c:62 [inline] #0: ffffffff8d2024d8 (&table[i].mutex){+.+.}-{3:3}, at: nfnetlink_rcv_msg+0x9a6/0xf30 net/netfilter/nfnetlink.c:224 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1132 Comm: khungtaskd Not tainted 5.7.0-rc6-syzkaller #0 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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 lapic_can_unplug_cpu.cold+0x3b/0x3b nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xa8c/0x1010 kernel/hung_task.c:289 reset_hung_task_detector+0x30/0x30 kernel/hung_task.c:243 kthread+0x388/0x470 kernel/kthread.c:268 kthread_mod_delayed_work+0x1a0/0x1a0 kernel/kthread.c:1090 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7042 Comm: syz-fuzzer Not tainted 5.7.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rcu_dynticks_curr_cpu_in_eqs+0x80/0xb0 kernel/rcu/tree.c:303 Code: 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 48 89 e8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 15 8b 83 d8 00 00 00 48 83 c4 08 5b <5d> d1 e8 83 f0 01 83 e0 01 c3 48 89 ef e8 ce c8 50 00 eb e1 48 89 RSP: 0000:ffffc900016871d8 EFLAGS: 00000292 RAX: 000000000016128a RBX: ffff8882196e5c00 RCX: ffffffff81603c7f RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880ae638818 RBP: ffff8880ae638818 R08: ffff8880955ce180 R09: ffffed1015cc7104 R10: ffff8880ae63881b R11: ffffed1015cc7103 R12: 0000000000000000 R13: ffffffff89a5ddc0 R14: 0000000000000080 R15: ffffc90001687370 FS: 000000c000081c90(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000460bf9 CR3: 0000000097a3d000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_is_watching+0xc/0x20 kernel/rcu/tree.c:929 rcu_read_lock include/linux/rcupdate.h:602 [inline] list_lru_count_one+0x2d9/0x360 mm/list_lru.c:181 list_lru_shrink_count include/linux/list_lru.h:123 [inline] count_shadow_nodes+0x76/0x840 mm/workingset.c:437 rcu_lock_release include/linux/rcupdate.h:213 [inline] rcu_read_unlock include/linux/rcupdate.h:655 [inline] list_lru_count_one+0x1e4/0x360 mm/list_lru.c:184 super_cache_count+0x240/0x2d0 fs/super.c:154 do_shrink_slab+0x107/0xa30 mm/vmscan.c:430 spin_unlock include/linux/spinlock.h:393 [inline] vmpressure+0x217/0x350 mm/vmpressure.c:274 shrink_slab mm/vmscan.c:673 [inline] shrink_slab+0x16f/0x5f0 mm/vmscan.c:646 rwlock_bug.part.0+0x90/0x90 include/linux/sched.h:1329 do_shrink_slab+0xa30/0xa30 mm/vmscan.c:439 pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:650 [inline] queued_spin_unlock arch/x86/include/asm/qspinlock.h:55 [inline] do_raw_spin_unlock+0x171/0x260 kernel/locking/spinlock_debug.c:139 __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock+0x24/0x40 kernel/locking/spinlock.c:183 shrink_node_memcgs mm/vmscan.c:2672 [inline] shrink_node+0x477/0x1b10 mm/vmscan.c:2776 shrink_zones mm/vmscan.c:2979 [inline] do_try_to_free_pages+0x38d/0x13a0 mm/vmscan.c:3032 shrink_node+0x1b10/0x1b10 include/linux/memcontrol.h:406 rcu_read_lock_any_held.part.0+0x50/0x50 arch/x86/include/asm/paravirt.h:754 try_to_free_pages+0x293/0x8d0 mm/vmscan.c:3271 reclaim_pages+0xd00/0xd00 include/linux/mm.h:1080 mark_held_locks+0x9f/0xe0 kernel/locking/lockdep.c:3628 __perform_reclaim mm/page_alloc.c:4191 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4212 [inline] __alloc_pages_slowpath.constprop.0+0x903/0x2660 mm/page_alloc.c:4618 warn_alloc+0x110/0x110 mm/page_alloc.c:3835 __alloc_pages_nodemask+0x5d9/0x810 mm/page_alloc.c:4831 __alloc_pages_slowpath.constprop.0+0x2660/0x2660 include/linux/compiler.h:199 xas_load+0x66/0x140 lib/xarray.c:244 rcu_lock_release include/linux/rcupdate.h:213 [inline] rcu_read_unlock include/linux/rcupdate.h:655 [inline] find_get_entry+0x426/0x730 mm/filemap.c:1535 __lock_page_or_retry+0xfb0/0xfb0 arch/x86/include/asm/bitops.h:207 alloc_pages_current+0xff/0x200 mm/mempolicy.c:2295 alloc_pages include/linux/gfp.h:540 [inline] __page_cache_alloc+0x298/0x480 mm/filemap.c:959 pagecache_get_page+0x27f/0xa10 mm/filemap.c:1645 filemap_fault+0xfca/0x2ed0 mm/filemap.c:2495 lock_downgrade+0x840/0x840 kernel/locking/lockdep.c:4579 read_cache_page_gfp+0x30/0x30 mm/filemap.c:2889 atomic64_set include/asm-generic/atomic-instrumented.h:854 [inline] atomic_long_set include/asm-generic/atomic-long.h:40 [inline] __rwsem_set_reader_owned kernel/locking/rwsem.c:208 [inline] rwsem_set_reader_owned kernel/locking/rwsem.c:213 [inline] __down_read kernel/locking/rwsem.c:1344 [inline] down_read+0x110/0x420 kernel/locking/rwsem.c:1494 down_read_killable+0x460/0x460 include/linux/compiler.h:199 lock_downgrade+0x840/0x840 kernel/locking/lockdep.c:4579 ext4_filemap_fault+0x87/0xb6 fs/ext4/inode.c:6033 __do_fault+0x10d/0x520 mm/memory.c:3450 do_read_fault mm/memory.c:3846 [inline] do_fault mm/memory.c:3975 [inline] handle_pte_fault mm/memory.c:4215 [inline] __handle_mm_fault+0x28a7/0x3c90 mm/memory.c:4345 vm_insert_pages+0x6a0/0x6a0 mm/memory.c:1599 rcu_read_unlock include/linux/rcupdate.h:651 [inline] count_memcg_event_mm+0x1e2/0x3d0 include/linux/memcontrol.h:773 mark_held_locks+0x9f/0xe0 kernel/locking/lockdep.c:3628 handle_mm_fault+0x1a5/0x660 mm/memory.c:4382 do_user_addr_fault arch/x86/mm/fault.c:1464 [inline] do_page_fault+0x55b/0x13da arch/x86/mm/fault.c:1535 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1203 RIP: 0033:0x43ada0 Code: Bad RIP value. RSP: 002b:000000c0000e9f70 EFLAGS: 00010206 RAX: 000000c0000fea80 RBX: 000000c000066480 RCX: 000000c000081c00 RDX: 000000c000043180 RSI: 0000000000000000 RDI: 0000000000438201 RBP: 000000c0000e9f90 R08: 00007ffd2d7cc080 R09: 0000000000000d73 R10: 000000c00003b6d8 R11: 0000000000000202 R12: 0000035d0f168844 R13: 0000000000000001 R14: 0000035d0f168844 R15: 0000000000008752