SELinux: Context system_u:object_r:cron_log_t:s0 is not valid (left unmapped). INFO: task syz-executor.1:23942 blocked for more than 140 seconds. Not tainted 4.9.171+ #49 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D26632 23942 17477 0x00000004 ffff8801a37cdf00 ffff8801d3b12680 ffff8801db621000 ffff8801d3b35f00 ffff8801db621018 ffff8801acb0f988 ffffffff82801dde 0000000000000000 ffffffff830c1d80 00ff8801acb0f9b0 ffff8801db6218f0 1ffff10035961f20 Call Trace: [<00000000046b7200>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000aa868aba>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<0000000007c1ff27>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<0000000007c1ff27>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<00000000cc530b24>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 [<000000005a472162>] loop_reread_partitions+0x7c/0x90 drivers/block/loop.c:638 [<0000000000904c78>] loop_clr_fd+0x7dd/0xa60 drivers/block/loop.c:1082 [<0000000090198b8d>] lo_ioctl+0x7b6/0x1a10 drivers/block/loop.c:1415 [<00000000cddcd40c>] __blkdev_driver_ioctl block/ioctl.c:294 [inline] [<00000000cddcd40c>] blkdev_ioctl+0xe14/0x19e0 block/ioctl.c:590 [<00000000696ee6c8>] block_ioctl+0xde/0x120 fs/block_dev.c:1696 [<00000000d7e13bc9>] vfs_ioctl fs/ioctl.c:43 [inline] [<00000000d7e13bc9>] file_ioctl fs/ioctl.c:493 [inline] [<00000000d7e13bc9>] do_vfs_ioctl+0xb87/0x11d0 fs/ioctl.c:677 [<000000001746cd4f>] SYSC_ioctl fs/ioctl.c:694 [inline] [<000000001746cd4f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685 [<000000003c1e52f3>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285 [<0000000034bac0b0>] 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: [<0000000054f92f95>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<0000000054f92f95>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<00000000236b3894>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 2 locks held by getty/2043: #0: (&tty->ldisc_sem){++++++}, at: [<00000000d4b90644>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000b15e7856>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.1/23942: #0: (loop_ctl_mutex/1){+.+.+.}, at: [<00000000bd1a46d2>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 #1: (&bdev->bd_mutex){+.+.+.}, at: [<00000000cc530b24>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 1 lock held by syz-executor.1/23951: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000000ce42c51>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 3 locks held by syz-executor.3/23940: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000b49a0fd6>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<000000008aac153f>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1664 #2: (loop_ctl_mutex#2){+.+.+.}, at: [<000000008af832a4>] __lo_release drivers/block/loop.c:1642 [inline] #2: (loop_ctl_mutex#2){+.+.+.}, at: [<000000008af832a4>] lo_release+0x84/0x1b0 drivers/block/loop.c:1665 1 lock held by syz-executor.0/23954: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000000ce42c51>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 1 lock held by syz-executor.0/23960: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000000ce42c51>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by blkid/23950: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000000ce42c51>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<0000000070cc2d30>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.171+ #49 ffff8801d98d7cc8 ffffffff81b4fb61 0000000000000000 0000000000000000 0000000000000000 ffffffff81097501 dffffc0000000000 ffff8801d98d7d00 ffffffff81b5adfc 0000000000000000 0000000000000000 0000000000000000 Call Trace: [<00000000f4a40220>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000f4a40220>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<000000005e9b3534>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000983c3ef1>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000696c2a03>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<0000000018f86aab>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<0000000018f86aab>] check_hung_task kernel/hung_task.c:126 [inline] [<0000000018f86aab>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<0000000018f86aab>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<0000000009d3278e>] kthread+0x278/0x310 kernel/kthread.c:211 [<000000002a4b59fe>] 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 CPU: 1 PID: 18535 Comm: syz-executor.2 Not tainted 4.9.171+ #49 task: 0000000003de52db task.stack: 0000000047545cca RIP: 0010:[] c [<00000000143214f8>] trace_hardirqs_on_caller+0x1fc/0x5a0 kernel/locking/lockdep.c:2735 RSP: 0018:ffff8801a42bfee0 EFLAGS: 00000803 RAX: dffffc0000000000 RBX: ffff8801a61817c0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81005817 RDI: ffff8801a618206c RBP: ffff8801a42bfef0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82812280 R13: 000000000000000c R14: 000000000000000d R15: 00000000ffffffff FS: 00007f53dc970700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000002 CR3: 0000000184f74000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Stack: 0000000000000009c 000000000000000bc ffff8801a42bff48c ffffffff810021dac 0000000000000000c 0000000000000000c 0000000000000000c 0000000000000005c 0000000000000000c 0000000000000000c 1ffff10034c302f9c ffffffff81005817c Call Trace: [<00000000e490674e>] trace_hardirqs_on_thunk+0x1a/0x1c [<000000000bde5d51>] entry_SYSCALL_64_after_swapgs+0x8a/0xdb Code: c0f c85 cb8 c01 c00 c00 c65 c48 c8b c1c c25 c00 c7e c01 c00 c48 c8d cbb cac c08 c00 c00 c48 cb8 c00 c00 c00 c00 c00 cfc cff cdf c48 c89 cfa c48 cc1 cea c03 c0f cb6 c14 c02 c<48> c89 cf8 c83 ce0 c07 c83 cc0 c03 c38 cd0 c7c c08 c84 cd2 c0f c85 c05 c02 c00 c00 c