INFO: task syz-executor.4:29335 can't die for more than 143 seconds. syz-executor.4 R running task 26320 29335 8857 0x00004006 Call Trace: mark_held_locks+0xa4/0xf0 kernel/locking/lockdep.c:3282 Showing all locks held in the system: 1 lock held by khungtaskd/1045: #0: 000000003d6509a5 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5262 1 lock held by rsyslogd/8713: #0: 0000000024f801b4 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8803: #0: 00000000cd54c25f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000062c8380c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8804: #0: 0000000005395cab (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000071088b6e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8805: #0: 00000000b4e53464 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000037541a59 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8806: #0: 0000000096a466fb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000116b9af6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8807: #0: 00000000db54386b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000001036e0b4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8808: #0: 000000000a7f4bad (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000e16bc3d9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8809: #0: 0000000062fb8915 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000053d74c66 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.4/29335: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1045 Comm: khungtaskd Not tainted 5.2.0-rc5-next-20190619 #18 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:249 [inline] watchdog+0xb88/0x12b0 kernel/hung_task.c:333 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 29335 Comm: syz-executor.4 Not tainted 5.2.0-rc5-next-20190619 #18 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lock_is_held_type+0x0/0x320 kernel/locking/lockdep.c:4449 Code: 75 d0 e9 00 fd ff ff 48 c7 c7 78 7b d2 88 48 89 75 d0 e8 e3 38 53 00 48 8b 75 d0 e9 1f fd ff ff 66 2e 0f 1f 84 00 00 00 00 00 <48> b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 57 41 56 49 89 fe 41 RSP: 0018:ffff8880575a7100 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1ffffffff1342c96 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff88da3c80 RBP: ffff8880575a7130 R08: ffff88808e58c380 R09: ffffed1025ffffa1 R10: ffffed1025ffffa0 R11: ffff88812ffffd07 R12: ffffffff8793c660 R13: 000000000000032b R14: dffffc0000000000 R15: 0000000000001134 FS: 00007f44336d2700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 0000000025afc000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: isolate_migratepages_block+0x1c5/0x2d10 mm/compaction.c:811 isolate_migratepages mm/compaction.c:1817 [inline] compact_zone+0x1409/0x3820 mm/compaction.c:2158 compact_zone_order+0x1af/0x2a0 mm/compaction.c:2308 try_to_compact_pages+0x268/0xaf0 mm/compaction.c:2360 __alloc_pages_direct_compact+0x154/0x460 mm/page_alloc.c:3846 __alloc_pages_slowpath+0x50e/0x2900 mm/page_alloc.c:4413 __alloc_pages_nodemask+0x600/0x8d0 mm/page_alloc.c:4693 alloc_pages_current+0x107/0x210 mm/mempolicy.c:2132 alloc_pages include/linux/gfp.h:509 [inline] ion_page_pool_alloc_pages drivers/staging/android/ion/ion_page_pool.c:16 [inline] ion_page_pool_alloc+0x137/0x1d0 drivers/staging/android/ion/ion_page_pool.c:75 alloc_buffer_page drivers/staging/android/ion/ion_system_heap.c:53 [inline] alloc_largest_available drivers/staging/android/ion/ion_system_heap.c:87 [inline] ion_system_heap_allocate+0x165/0xaa0 drivers/staging/android/ion/ion_system_heap.c:118 ion_buffer_create drivers/staging/android/ion/ion.c:76 [inline] ion_alloc drivers/staging/android/ion/ion.c:417 [inline] ion_ioctl+0x3d2/0xf60 drivers/staging/android/ion/ion.c:543 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4592c9 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f44336d1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004592c9 RDX: 00000000200004c0 RSI: 00000000c0184900 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f44336d26d4 R13: 00000000004c1f25 R14: 00000000004d4dc0 R15: 00000000ffffffff