selinux_nlmsg_perm: 6 callbacks suppressed SELinux: unrecognized netlink message: protocol=0 nlmsg_type=1886 sclass=netlink_route_socket pig=11466 comm=syz-executor.5 INFO: task syz-executor.2:3706 blocked for more than 140 seconds. Not tainted 4.9.202+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D25416 3706 1 0x00000004 0000000000000083 ffff8801c54a0000 ffff8801d21edd80 ffff8801db71ffc0 ffff8801cebd17c0 ffff8801db71ffd8 ffff8801a0a47688 ffffffff8280a1de ffff8801c54a0000 ffffffff841f6b00 00ff8801a0a475e8 ffff8801db7208b0 Call Trace: [<000000005f0a3979>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000ed3fd766>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<00000000c1817bcb>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<00000000c1817bcb>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<000000002d22b252>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 [<00000000e2673efb>] __blkdev_get+0x268/0xeb0 fs/block_dev.c:1287 [<00000000b727f44c>] blkdev_get+0x2e8/0x920 fs/block_dev.c:1424 [<00000000742aa0eb>] blkdev_open+0x1aa/0x250 fs/block_dev.c:1579 [<00000000398beb37>] do_dentry_open+0x422/0xd20 fs/open.c:791 [<00000000f8835584>] vfs_open+0x105/0x230 fs/open.c:904 [<00000000b961bf18>] do_last fs/namei.c:3457 [inline] [<00000000b961bf18>] path_openat+0xbf5/0x2f60 fs/namei.c:3581 [<000000001294f3f7>] do_filp_open+0x1a1/0x280 fs/namei.c:3615 [<00000000476b2c7d>] do_sys_open+0x2f0/0x610 fs/open.c:1097 [<00000000cd5c8ad1>] SYSC_open fs/open.c:1115 [inline] [<00000000cd5c8ad1>] SyS_open+0x2d/0x40 fs/open.c:1110 [<000000007b629d0e>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000d9419cf6>] 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: [<00000000675ecc09>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<00000000675ecc09>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<00000000071b1038>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339 2 locks held by getty/2032: #0: (&tty->ldisc_sem){++++++}, at: [<0000000010cfd57a>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000b0480167>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.2/3706: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000008c56a899>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000002d22b252>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 2 locks held by syz-executor.4/8730: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000008c56a899>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000002d22b252>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 2 locks held by syz-executor.3/9407: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000008c56a899>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000002d22b252>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 2 locks held by syz-executor.1/11442: #0: (loop_index_mutex){+.+.+.}, at: [<000000001b286ae3>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1974 #1: (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<0000000040d32af6>] loop_control_ioctl+0x17f/0x320 drivers/block/loop.c:1988 1 lock held by syz-executor.1/11461: #0: (loop_index_mutex){+.+.+.}, at: [<000000001b286ae3>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1974 1 lock held by syz-executor.5/11460: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000008c56a899>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by syz-executor.0/11448: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<00000000f47efaf2>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 #1: (&bdev->bd_mutex){+.+.+.}, at: [<00000000fb13f43d>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 1 lock held by syz-executor.0/11470: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000008c56a899>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by blkid/11458: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000008c56a899>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000002d22b252>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.202+ #0 ffff8801d98d7cc8 ffffffff81b55d2b 0000000000000001 0000000000000000 0000000000000001 ffffffff8109a001 dffffc0000000000 ffff8801d98d7d00 ffffffff81b60fcc 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<00000000c68bd4c2>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000c68bd4c2>] dump_stack+0xcb/0x130 lib/dump_stack.c:56 [<0000000004d68bfa>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<000000002222e754>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<0000000078730673>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000007965feec>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000007965feec>] check_hung_task kernel/hung_task.c:126 [inline] [<000000007965feec>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<000000007965feec>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<00000000adba5ce6>] kthread+0x278/0x310 kernel/kthread.c:211 [<000000005f6182b2>] 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 0xffffffff82819331