INFO: task syz-executor2:28765 blocked for more than 120 seconds. Not tainted 4.16.0-rc4+ #260 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D20112 28765 4276 0x20020004 Call Trace: context_switch kernel/sched/core.c:2862 [inline] __schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440 schedule+0xf5/0x430 kernel/sched/core.c:3499 io_schedule+0x1c/0x70 kernel/sched/core.c:5115 __blkdev_direct_IO_simple+0x7bd/0xf50 fs/block_dev.c:241 blkdev_direct_IO+0xccb/0x1060 fs/block_dev.c:428 generic_file_read_iter+0x4cc/0x28e0 mm/filemap.c:2343 blkdev_read_iter+0x105/0x170 fs/block_dev.c:1928 call_read_iter include/linux/fs.h:1775 [inline] generic_file_splice_read+0x3f9/0x7b0 fs/splice.c:307 do_splice_to+0x10a/0x160 fs/splice.c:880 splice_direct_to_actor+0x242/0x820 fs/splice.c:952 do_splice_direct+0x29b/0x3c0 fs/splice.c:1061 do_sendfile+0x5c9/0xe80 fs/read_write.c:1413 C_SYSC_sendfile fs/read_write.c:1489 [inline] compat_SyS_sendfile+0xea/0x1a0 fs/read_write.c:1478 do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fb1c99 RSP: 002b:00000000f77ad09c EFLAGS: 00000286 ORIG_RAX: 00000000000000bb RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 0000000000000014 RDX: 00000000200000c0 RSI: 0000000000004200 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 2 locks held by khungtaskd/799: #0: (rcu_read_lock){....}, at: [<0000000028006939>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<0000000028006939>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<00000000cf90f77e>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470 1 lock held by rsyslogd/4076: #0: (&f->f_pos_lock){+.+.}, at: [<00000000b1bc2b5c>] __fdget_pos+0x12b/0x190 fs/file.c:765 2 locks held by getty/4198: #0: (&tty->ldisc_sem){++++}, at: [<00000000777429dd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000047bd66ca>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4199: #0: (&tty->ldisc_sem){++++}, at: [<00000000777429dd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000047bd66ca>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4200: #0: (&tty->ldisc_sem){++++}, at: [<00000000777429dd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000047bd66ca>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4201: #0: (&tty->ldisc_sem){++++}, at: [<00000000777429dd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000047bd66ca>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4202: #0: (&tty->ldisc_sem){++++}, at: [<00000000777429dd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000047bd66ca>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4203: #0: (&tty->ldisc_sem){++++}, at: [<00000000777429dd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000047bd66ca>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4204: #0: (&tty->ldisc_sem){++++}, at: [<00000000777429dd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000047bd66ca>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 799 Comm: khungtaskd Not tainted 4.16.0-rc4+ #260 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x123/0x180 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:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0x90c/0xd60 kernel/hung_task.c:249 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4074 Comm: rs:main Q:Reg Not tainted 4.16.0-rc4+ #260 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 RSP: 0018:ffff8801b8297a48 EFLAGS: 00000086 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 1ffff100370b65c6 RSI: 0000000082766940 RDI: ffffed0037052f40 RBP: ffff8801b8297b60 R08: 1ffff10037052eb1 R09: 0000000000000002 R10: ffff8801b8297a48 R11: 0000000000000000 R12: 1ffff10037052f53 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000 FS: 00007fb76c62c700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb723a91140 CR3: 00000001b0c1e003 CR4: 00000000001606f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:244 [inline] rcu_read_lock include/linux/rcupdate.h:630 [inline] dput.part.20+0xc0/0x830 fs/dcache.c:796 dput+0x1f/0x30 fs/dcache.c:790 __fsnotify_parent+0x2cd/0x3d0 fs/notify/fsnotify.c:180 fsnotify_parent include/linux/fsnotify.h:26 [inline] fsnotify_modify include/linux/fsnotify.h:206 [inline] vfs_write+0x39a/0x510 fs/read_write.c:546 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7fb76e08a19d RSP: 002b:00007fb76c62b000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000053 RCX: 00007fb76e08a19d RDX: 0000000000000053 RSI: 000000000173e340 RDI: 0000000000000002 RBP: 000000000173e340 R08: 000000000173e383 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007fb76c62b480 R14: 0000000000000001 R15: 000000000173e140 Code: ea 6a 00 ff 75 10 45 89 f8 53 48 8b bd 30 ff ff ff 44 89 f1 49 c1 e9 09 8b b5 2c ff ff ff 49 83 f1 01 41 83 e1 01 e8 9b a0 ff ff <65> 48 8b 1c 25 c0 ed 01 00 48 8d bb 74 08 00 00 48 b8 00 00 00