audit: type=1400 audit(2000000188.927:38412): avc: denied { syslog } for pid=2412 comm="syz-executor.5" capability=34 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=capability2 permissive=1 audit: type=1400 audit(2000000193.945:38413): avc: denied { syslog } for pid=2412 comm="syz-executor.5" capability=34 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=capability2 permissive=1 audit: type=1400 audit(2000000198.943:38414): avc: denied { syslog } for pid=2412 comm="syz-executor.5" capability=34 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=capability2 permissive=1 INFO: task init:11769 blocked for more than 140 seconds. Not tainted 4.9.171+ #49 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D28872 11769 1 0x00000000 ffff88019ccc4740 ffff8801c9ea0b00 ffff8801db721000 ffff8801d7715f00 ffff8801db721018 ffff8801a815f5a0 ffffffff82801dde ffffffff810ab78c ffff8801a815f540 00ffffff810abaa0 ffff8801db7218f0 1ffff1003502bea3 Call Trace: [<0000000033509640>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000d73aef5d>] schedule_timeout+0x766/0xe50 kernel/time/timer.c:1771 [<000000009f5b0b78>] __down_common kernel/locking/semaphore.c:221 [inline] [<000000009f5b0b78>] __down+0x190/0x2b0 kernel/locking/semaphore.c:238 [<0000000029e50bdc>] down+0x64/0x90 kernel/locking/semaphore.c:61 [<000000007df5c757>] console_lock+0x2c/0x80 kernel/printk/printk.c:2217 [<000000004131fc6f>] console_device+0x1c/0xc0 kernel/printk/printk.c:2554 [<000000000d618439>] tty_lookup_driver drivers/tty/tty_io.c:2018 [inline] [<000000000d618439>] tty_open_by_driver drivers/tty/tty_io.c:2063 [inline] [<000000000d618439>] tty_open+0x796/0xe10 drivers/tty/tty_io.c:2140 [<0000000094db3a2d>] chrdev_open+0x230/0x630 fs/char_dev.c:392 [<000000007c1d82b8>] do_dentry_open+0x422/0xd20 fs/open.c:772 [<00000000081db47e>] vfs_open+0x105/0x230 fs/open.c:885 [<0000000024f67db4>] do_last fs/namei.c:3457 [inline] [<0000000024f67db4>] path_openat+0xbf5/0x2f60 fs/namei.c:3581 [<00000000981e788b>] do_filp_open+0x1a1/0x280 fs/namei.c:3615 [<00000000d04c8817>] do_sys_open+0x2f0/0x610 fs/open.c:1078 [<00000000ab8ecdca>] SYSC_open fs/open.c:1096 [inline] [<00000000ab8ecdca>] SyS_open+0x2d/0x40 fs/open.c:1091 [<000000004f582035>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285 [<000000001ba3ab28>] 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: [<000000008ae037f3>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<000000008ae037f3>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<000000000e850541>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/1907: #0: (&f->f_pos_lock){+.+.+.}, at: [<00000000bc9a93b4>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2034: #0: (&tty->ldisc_sem){++++++}, at: [<00000000d29cc245>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000b2a32215>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.1/9031: #0: (tty_mutex){+.+.+.}, at: [<000000008f25866a>] tty_release+0xb42/0xe30 drivers/tty/tty_io.c:1948 1 lock held by init/11769: #0: (tty_mutex){+.+.+.}, at: [<00000000e987dff3>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000e987dff3>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/11770: #0: (tty_mutex){+.+.+.}, at: [<00000000e987dff3>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000e987dff3>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/11771: #0: (tty_mutex){+.+.+.}, at: [<00000000e987dff3>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000e987dff3>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/11772: #0: (tty_mutex){+.+.+.}, at: [<00000000e987dff3>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000e987dff3>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/11773: #0: (tty_mutex){+.+.+.}, at: [<00000000e987dff3>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000e987dff3>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/11774: #0: (tty_mutex){+.+.+.}, at: [<00000000e987dff3>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000e987dff3>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.171+ #49 ffff8801d98d7cc8 ffffffff81b4fb61 0000000000000001 0000000000000000 0000000000000001 ffffffff81097501 dffffc0000000000 ffff8801d98d7d00 ffffffff81b5adfc 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<000000004cb5248a>] __dump_stack lib/dump_stack.c:15 [inline] [<000000004cb5248a>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<0000000012eb0c70>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<000000008a8a8eab>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000e9fcbc81>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<00000000bae61d82>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<00000000bae61d82>] check_hung_task kernel/hung_task.c:126 [inline] [<00000000bae61d82>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<00000000bae61d82>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<00000000ec18ed3b>] kthread+0x278/0x310 kernel/kthread.c:211 [<000000007168d029>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6 Comm: ksoftirqd/0 Not tainted 4.9.171+ #49 task: 000000000fd01843 task.stack: 00000000690f13e6 RIP: 0010:[] c [<0000000076d16610>] trace_event_get_offsets_lock_acquire include/trace/events/lock.h:12 [inline] RIP: 0010:[] c [<0000000076d16610>] perf_trace_lock_acquire+0xcb/0x530 include/trace/events/lock.h:12 RSP: 0018:ffff8801da68f900 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffff8801d2cddce8 RCX: 0000000000000000 RDX: 1ffffffff0855c8f RSI: ffffffff842ae460 RDI: ffffffff830c1ec0 RBP: ffff8801da68f9f0 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000001 R11: ffffffff811ffec0 R12: ffffffff830c1e40 R13: ffffffff842ae460 R14: ffff8801da68f9c8 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000013ca7a000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Stack: ffffffff814f87fac 0000004000000008c ffff8801da68f920c 0000000000000000c ffffffff00000000c ffffffff842ae478c ffffffff814f576cc 1ffff1003b4d1f29c ffffffff819f3389c 0000000041b58ab3c ffffffff82e287b8c ffffffff811ffec0c Call Trace: [<000000009c946e4c>] trace_lock_acquire include/trace/events/lock.h:12 [inline] [<000000009c946e4c>] lock_acquire+0x29a/0x3d0 kernel/locking/lockdep.c:3755 [<00000000442e9875>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:112 [inline] [<00000000442e9875>] _raw_spin_lock_irqsave+0x50/0x70 kernel/locking/spinlock.c:159 [<000000001b8ad3e6>] __debug_check_no_obj_freed lib/debugobjects.c:711 [inline] [<000000001b8ad3e6>] debug_check_no_obj_freed+0x159/0x6d0 lib/debugobjects.c:749 [<000000006a2f5cc1>] slab_free_hook mm/slub.c:1348 [inline] [<000000006a2f5cc1>] slab_free_freelist_hook mm/slub.c:1377 [inline] [<000000006a2f5cc1>] slab_free mm/slub.c:2958 [inline] [<000000006a2f5cc1>] kmem_cache_free+0x1a4/0x310 mm/slub.c:2980 [<00000000c8b3f60a>] put_cred_rcu+0x1af/0x260 kernel/cred.c:125 [<00000000fc7aff0a>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline] [<00000000fc7aff0a>] rcu_do_batch kernel/rcu/tree.c:2797 [inline] [<00000000fc7aff0a>] invoke_rcu_callbacks kernel/rcu/tree.c:3061 [inline] [<00000000fc7aff0a>] __rcu_process_callbacks kernel/rcu/tree.c:3028 [inline] [<00000000fc7aff0a>] rcu_process_callbacks+0x8c2/0x1300 kernel/rcu/tree.c:3045 [<000000007519cc3e>] __do_softirq+0x22d/0x964 kernel/softirq.c:288 [<000000005d4370a0>] run_ksoftirqd+0x30/0x60 kernel/softirq.c:680 [<000000007595d734>] smpboot_thread_fn+0x5fd/0x950 kernel/smpboot.c:163 [<00000000ec18ed3b>] kthread+0x278/0x310 kernel/kthread.c:211 [<000000007168d029>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Code: c03 c00 c00 c49 c8d c45 c18 c4d c8b cbc c24 c80 c00 c00 c00 c48 c89 cc2 c48 c89 c85 c38 cff cff cff c48 cb8 c00 c00 c00 c00 c00 cfc cff cdf c48 cc1 cea c03 c80 c3c c02 c00 c<0f> c85 c73 c03 c00 c00 c49 c8b c7d c18 c48 c85 cff c0f c84 c01 c03 c00 c00 ce8 c8d c