audit: type=1400 audit(1565090058.881:260): avc: denied { create } for pid=448 comm="syz-executor.1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 INFO: task syz-executor.5:2115 blocked for more than 140 seconds. Not tainted 4.9.187+ #17 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D25016 2115 1 0x00000004 0000000000000087 ffff8801d1c48000 ffff8801d1cdee00 ffff8801db621000 ffff8801d0a9c740 ffff8801db621018 ffff8801a5427598 ffffffff8281717e ffffffff82e2e668 ffffffff8120ba70 00ffffff83c84a40 ffff8801db6218f0 Call Trace: [<000000009ff31f4b>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000a737c5bb>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<000000009440b24e>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<000000009440b24e>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<00000000fa5d588f>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364 [<000000000005fc76>] fuse_lookup+0x89/0x3b0 fs/fuse/dir.c:406 [<000000006ef56921>] lookup_slow+0x24b/0x480 fs/namei.c:1709 [<0000000000034712>] walk_component+0x71e/0xce0 fs/namei.c:1825 [<00000000a6530538>] link_path_walk+0x8b4/0x1210 fs/namei.c:2161 [<00000000078fd894>] path_mountpoint+0x67/0x6d0 fs/namei.c:2737 [<00000000db732223>] filename_mountpoint+0x17f/0x350 fs/namei.c:2758 [<000000007d663f96>] user_path_mountpoint_at+0x3a/0x50 fs/namei.c:2788 [<00000000771725d3>] SYSC_umount fs/namespace.c:1722 [inline] [<00000000771725d3>] SyS_umount+0x136/0xd30 fs/namespace.c:1706 [<00000000bfc6e54e>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000f9bc6548>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Showing all locks held in the system: 2 locks held by khungtaskd/24: #0: (rcu_read_lock){......}, at: [<00000000fd9969aa>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<00000000fd9969aa>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<0000000052b6b79e>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 2 locks held by rs:main Q:Reg/1895: #0: (&f->f_pos_lock){+.+.+.}, at: [<000000005b96da17>] __fdget_pos+0xa8/0xd0 fs/file.c:782 #1: (sb_writers#4){.+.+.+}, at: [<000000006a4993ea>] file_start_write include/linux/fs.h:2646 [inline] #1: (sb_writers#4){.+.+.+}, at: [<000000006a4993ea>] vfs_write+0x3e9/0x520 fs/read_write.c:558 1 lock held by rsyslogd/1898: #0: (&f->f_pos_lock){+.+.+.}, at: [<000000005b96da17>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2025: #0: (&tty->ldisc_sem){++++++}, at: [<00000000a8e3feca>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000af9359d7>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.5/2115: #0: (&type->i_mutex_dir_key#7){++++++}, at: [<000000006752c671>] inode_lock_shared include/linux/fs.h:781 [inline] #0: (&type->i_mutex_dir_key#7){++++++}, at: [<000000006752c671>] lookup_slow+0x160/0x480 fs/namei.c:1686 #1: (&fi->mutex){+.+.+.}, at: [<00000000fa5d588f>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364 2 locks held by syz-executor.5/31459: #0: (sb_writers#14){.+.+..}, at: [<00000000fc31bb69>] sb_start_write include/linux/fs.h:1579 [inline] #0: (sb_writers#14){.+.+..}, at: [<00000000fc31bb69>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391 #1: (&type->i_mutex_dir_key#7){++++++}, at: [<000000004cbdd365>] inode_lock include/linux/fs.h:771 [inline] #1: (&type->i_mutex_dir_key#7){++++++}, at: [<000000004cbdd365>] chown_common.isra.0+0x2d8/0x550 fs/open.c:645 2 locks held by syz-executor.5/388: #0: (&type->i_mutex_dir_key#7){++++++}, at: [<000000006752c671>] inode_lock_shared include/linux/fs.h:781 [inline] #0: (&type->i_mutex_dir_key#7){++++++}, at: [<000000006752c671>] lookup_slow+0x160/0x480 fs/namei.c:1686 #1: (&fi->mutex){+.+.+.}, at: [<00000000fa5d588f>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.187+ #17 ffff8801d98d7cc8 ffffffff81b64701 0000000000000001 0000000000000000 0000000000000001 ffffffff81099a01 dffffc0000000000 ffff8801d98d7d00 ffffffff81b6f99c 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<00000000251c2ea7>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000251c2ea7>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000732492e2>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<0000000054e87c72>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000ceff8021>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<00000000fed4f709>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<00000000fed4f709>] check_hung_task kernel/hung_task.c:126 [inline] [<00000000fed4f709>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<00000000fed4f709>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<000000003c4c9a0d>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000e696cf08>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff828262d1