INFO: task syz-executor.3:11858 can't die for more than 143 seconds. syz-executor.3 R running task 26448 11858 8828 0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1063: #0: ffffffff88fa9440 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5337 1 lock held by rsyslogd/8690: 2 locks held by getty/8780: #0: ffff88809ab10210 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f312e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8781: #0: ffff88809a33e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f1d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8782: #0: ffff88809a33e910 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f192e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8783: #0: ffff888096e81350 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f352e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8784: #0: ffff88809a158a10 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f392e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8785: #0: ffff88808a358110 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f252e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8786: #0: ffff88808a2f8e10 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f092e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1063 Comm: khungtaskd Not tainted 5.3.0-rc5-next-20190823 #72 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+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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:269 [inline] watchdog+0xc99/0x1360 kernel/hung_task.c:353 kthread+0x361/0x430 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: 1768 Comm: kswapd0 Not tainted 5.3.0-rc5-next-20190823 #72 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:match_held_lock+0x2d/0x510 kernel/locking/lockdep.c:4014 Code: 00 00 00 00 fc ff df 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 89 fb 48 83 c7 10 48 89 fa 48 83 ec 08 48 c1 ea 03 80 3c 02 00 <0f> 85 f5 03 00 00 48 39 73 10 0f 84 f9 01 00 00 48 8d 7b 22 48 b8 RSP: 0018:ffff8880a5aef2a8 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffff8880a5b0a9d8 RCX: ffff8880a5b0a9d8 RDX: 1ffff11014b6153d RSI: ffffffff88fa93c0 RDI: ffff8880a5b0a9e8 RBP: ffff8880a5aef2d8 R08: ffff8880a5b0a140 R09: ffffed1015d26af5 R10: ffffed1015d26af4 R11: ffff8880ae9357a3 R12: ffffed1014b6153a R13: ffff8880a5b0a9d8 R14: ffffffff88fa93c0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000422d10 CR3: 000000008f1e9000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_is_held kernel/locking/lockdep.c:4308 [inline] lock_is_held_type+0x1b8/0x320 kernel/locking/lockdep.c:4525 lock_is_held include/linux/lockdep.h:362 [inline] rcu_read_lock_sched_held+0x9c/0xd0 kernel/rcu/update.c:122 trace_mm_page_pcpu_drain include/trace/events/kmem.h:254 [inline] free_pcppages_bulk+0x1453/0x18a0 mm/page_alloc.c:1322 free_unref_page_commit+0x2ca/0x3c0 mm/page_alloc.c:3045 free_unref_page_list+0x2d4/0x700 mm/page_alloc.c:3088 shrink_page_list+0x130d/0x5550 mm/vmscan.c:1530 shrink_inactive_list+0x4ee/0xe30 mm/vmscan.c:1996 shrink_list mm/vmscan.c:2287 [inline] shrink_node_memcg+0x6d2/0x1600 mm/vmscan.c:2602 shrink_node+0x1a6/0x12e0 mm/vmscan.c:2805 kswapd_shrink_node mm/vmscan.c:3549 [inline] balance_pgdat+0x57c/0xea0 mm/vmscan.c:3707 kswapd+0x5c3/0xf30 mm/vmscan.c:3958 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352