SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pig=5963 comm=syz-executor.5 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pig=5971 comm=syz-executor.5 INFO: task syz-executor.0:2111 blocked for more than 140 seconds. Not tainted 4.9.169+ #43 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D25000 2111 1 0x00000004 ffff8801cfd32f80 ffff8801cf243c80 ffff8801db621000 ffff8801cf27c740 ffff8801db621018 ffff8801adfbfa28 ffffffff8280152e 0000000041b58ab3 ffffffff82e2b8b0 00ffffff81200360 ffff8801db6218f0 1ffff10035bf7f34 Call Trace: [<0000000078284089>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000ab2f27e1>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<000000007e7084ae>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<000000007e7084ae>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<00000000df591612>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 [<0000000069712e90>] __blkdev_driver_ioctl block/ioctl.c:294 [inline] [<0000000069712e90>] blkdev_ioctl+0xe14/0x19e0 block/ioctl.c:590 [<00000000650658cf>] block_ioctl+0xde/0x120 fs/block_dev.c:1696 [<0000000014cdb785>] vfs_ioctl fs/ioctl.c:43 [inline] [<0000000014cdb785>] file_ioctl fs/ioctl.c:493 [inline] [<0000000014cdb785>] do_vfs_ioctl+0xb87/0x11d0 fs/ioctl.c:677 [<00000000664797f8>] SYSC_ioctl fs/ioctl.c:694 [inline] [<00000000664797f8>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685 [<000000000a8441ef>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285 [<0000000070c19049>] 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: [<000000006f6022d6>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] #0: (rcu_read_lock){......}, at: [<000000006f6022d6>] watchdog+0x13c/0xae0 kernel/hung_task.c:239 #1: (tasklist_lock){.+.+..}, at: [<00000000d175fd16>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339 2 locks held by getty/2024: #0: (&tty->ldisc_sem){++++++}, at: [<00000000af446b20>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000dba1945b>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.0/2111: #0: (loop_ctl_mutex/1){+.+.+.}, at: [<00000000df591612>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 1 lock held by syz-executor.4/2120: #0: (loop_ctl_mutex/1){+.+.+.}, at: [<00000000df591612>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 1 lock held by syz-executor.5/2124: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000ebdb4364>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 1 lock held by syz-executor.1/2127: #0: (loop_ctl_mutex/1){+.+.+.}, at: [<00000000df591612>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 2 locks held by blkid/5953: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000ebdb4364>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<00000000c85486b9>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 2 locks held by blkid/5957: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000ebdb4364>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<00000000c85486b9>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 2 locks held by syz-executor.2/5969: #0: (loop_index_mutex){+.+.+.}, at: [<000000004f1d185d>] loop_control_ioctl+0x7a/0x2f0 drivers/block/loop.c:1973 #1: (loop_ctl_mutex#2){+.+.+.}, at: [<00000000135d3ae9>] loop_control_ioctl+0x177/0x2f0 drivers/block/loop.c:1987 1 lock held by syz-executor.2/5973: #0: (loop_index_mutex){+.+.+.}, at: [<000000004f1d185d>] loop_control_ioctl+0x7a/0x2f0 drivers/block/loop.c:1973 2 locks held by blkid/5961: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000ebdb4364>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<00000000c85486b9>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 2 locks held by syz-executor.3/5965: #0: (loop_ctl_mutex/1){+.+.+.}, at: [<00000000df591612>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 #1: (&bdev->bd_mutex){+.+.+.}, at: [<00000000cfac7aa5>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.169+ #43 ffff8801d98d7cc8 ffffffff81b4f7f1 0000000000000000 0000000000000000 0000000000000000 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00 ffffffff81b5aa8c 0000000000000000 0000000000000000 0000000000000000 Call Trace: [<000000007a67374b>] __dump_stack lib/dump_stack.c:15 [inline] [<000000007a67374b>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000071094d9>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<0000000049c2b892>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<000000001dc25eb1>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<0000000097a0a277>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<0000000097a0a277>] check_hung_task kernel/hung_task.c:125 [inline] [<0000000097a0a277>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [<0000000097a0a277>] watchdog+0x661/0xae0 kernel/hung_task.c:239 [<0000000043c957a5>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000e3b007eb>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff828105a2