selinux_nlmsg_perm: 1527 callbacks suppressed SELinux: unrecognized netlink message: protocol=0 nlmsg_type=44910 sclass=netlink_route_socket pig=25070 comm=syz-executor.0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=44910 sclass=netlink_route_socket pig=25084 comm=syz-executor.0 INFO: task syz-executor.3:2119 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.3 D25528 2119 1 0x00000004 ffff8801cf5ec740 ffff880194785280 ffff8801db721000 ffff8801864b8000 ffff8801db721018 ffff8801a69b7a28 ffffffff8280152e 0000000041b58ab3 ffffffff82e2b8b0 00ffffff81200360 ffff8801db7218f0 1ffff10034d36f34 Call Trace: [<000000001ce21e4b>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<000000009faaef36>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<0000000063d09a5e>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<0000000063d09a5e>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<0000000008f988c8>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 [<000000004d1ad2bb>] __blkdev_driver_ioctl block/ioctl.c:294 [inline] [<000000004d1ad2bb>] blkdev_ioctl+0xe14/0x19e0 block/ioctl.c:590 [<00000000ca97a084>] block_ioctl+0xde/0x120 fs/block_dev.c:1696 [<0000000048b36419>] vfs_ioctl fs/ioctl.c:43 [inline] [<0000000048b36419>] file_ioctl fs/ioctl.c:493 [inline] [<0000000048b36419>] do_vfs_ioctl+0xb87/0x11d0 fs/ioctl.c:677 [<000000001403a8fa>] SYSC_ioctl fs/ioctl.c:694 [inline] [<000000001403a8fa>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685 [<000000000f2341e6>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285 [<000000008528e462>] 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: [<00000000d1305ff9>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] #0: (rcu_read_lock){......}, at: [<00000000d1305ff9>] watchdog+0x13c/0xae0 kernel/hung_task.c:239 #1: (tasklist_lock){.+.+..}, at: [<000000001f0047a1>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339 1 lock held by rsyslogd/1897: #0: (&f->f_pos_lock){+.+.+.}, at: [<00000000710ddcce>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2024: #0: (&tty->ldisc_sem){++++++}, at: [<0000000055084403>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+...}, at: [<000000002c2fcfbb>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.3/2119: #0: (loop_ctl_mutex/1){+.+.+.}, at: [<0000000008f988c8>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 2 locks held by syz-executor.2/12081: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000096cca500>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<0000000014fb1f1f>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 3 locks held by syz-executor.4/25049: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000008a161c58>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<00000000c8d04891>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1664 #2: (loop_ctl_mutex#2){+.+.+.}, at: [<00000000e2edbeef>] __lo_release drivers/block/loop.c:1642 [inline] #2: (loop_ctl_mutex#2){+.+.+.}, at: [<00000000e2edbeef>] lo_release+0x84/0x1b0 drivers/block/loop.c:1665 1 lock held by syz-executor.4/25088: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000096cca500>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by syz-executor.1/25047: #0: (loop_ctl_mutex/1){+.+.+.}, at: [<0000000008f988c8>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 #1: (&bdev->bd_mutex){+.+.+.}, at: [<00000000928979b9>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 1 lock held by syz-executor.1/25087: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000096cca500>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 1 lock held by blkid/25063: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000096cca500>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by blkid/25064: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000096cca500>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<0000000014fb1f1f>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 ============================================= 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: [<00000000d3dd2ba3>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000d3dd2ba3>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<0000000058ced5b6>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000c488963b>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<000000003728f8d7>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<00000000a172751e>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<00000000a172751e>] check_hung_task kernel/hung_task.c:125 [inline] [<00000000a172751e>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [<00000000a172751e>] watchdog+0x661/0xae0 kernel/hung_task.c:239 [<000000000c5eb7eb>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000cfc5f667>] 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