binder: undelivered TRANSACTION_ERROR: 29201 binder: undelivered TRANSACTION_ERROR: 29201 INFO: task syz-executor6:5584 blocked for more than 120 seconds. Not tainted 4.15.0-rc2-next-20171207+ #62 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor6 D23976 5584 3391 0x00000004 Call Trace: context_switch kernel/sched/core.c:2800 [inline] __schedule+0x8eb/0x2060 kernel/sched/core.c:3376 schedule+0xf5/0x430 kernel/sched/core.c:3435 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3493 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0xaad/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x1759/0x1e00 block/ioctl.c:601 block_ioctl+0xea/0x130 fs/block_dev.c:1860 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452a39 RSP: 002b:00007f266285dc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452a39 RDX: 000000002068bff0 RSI: 00000000c0106434 RDI: 0000000000000013 RBP: 0000000000000091 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ede38 R13: 00000000ffffffff R14: 00007f266285e6d4 R15: 0000000000000000 Showing all locks held in the system: 2 locks held by khungtaskd/670: #0: (rcu_read_lock){....}, at: [<00000000c42813cc>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<00000000c42813cc>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<000000002bf1f8f7>] debug_show_all_locks+0xd3/0x400 kernel/locking/lockdep.c:4554 2 locks held by getty/3119: #0: (&tty->ldisc_sem){++++}, at: [<000000005af1921b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e6bbb75>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3120: #0: (&tty->ldisc_sem){++++}, at: [<000000005af1921b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e6bbb75>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3121: #0: (&tty->ldisc_sem){++++}, at: [<000000005af1921b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e6bbb75>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3122: #0: (&tty->ldisc_sem){++++}, at: [<000000005af1921b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e6bbb75>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3123: #0: (&tty->ldisc_sem){++++}, at: [<000000005af1921b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e6bbb75>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3124: #0: (&tty->ldisc_sem){++++}, at: [<000000005af1921b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e6bbb75>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3125: #0: (&tty->ldisc_sem){++++}, at: [<000000005af1921b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e6bbb75>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 1 lock held by syz-executor6/5584: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<00000000cfb51142>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 2 locks held by syz-executor6/5601: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<00000000cfb51142>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 #1: (&bdev->bd_mutex){+.+.}, at: [<0000000089c5d73f>] blkdev_reread_part+0x1e/0x40 block/ioctl.c:192 1 lock held by syz-executor6/5605: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<00000000cfb51142>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 1 lock held by syz-executor6/5621: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<00000000cfb51142>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 1 lock held by syz-executor6/5626: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<00000000cfb51142>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 2 locks held by syz-executor4/5604: #0: (loop_index_mutex){+.+.}, at: [<000000009f965f94>] loop_control_ioctl+0x89/0x490 drivers/block/loop.c:1932 #1: (&lo->lo_ctl_mutex#2){+.+.}, at: [<00000000b9b0f8e1>] loop_control_ioctl+0x1a7/0x490 drivers/block/loop.c:1946 1 lock held by syz-executor4/5610: #0: (loop_index_mutex){+.+.}, at: [<000000009f965f94>] loop_control_ioctl+0x89/0x490 drivers/block/loop.c:1932 2 locks held by blkid/5594: #0: (&bdev->bd_mutex){+.+.}, at: [<0000000080d6c150>] __blkdev_get+0x158/0x10e0 fs/block_dev.c:1439 #1: (loop_index_mutex){+.+.}, at: [<0000000020bd5587>] lo_open+0x1b/0xa0 drivers/block/loop.c:1571 2 locks held by syz-executor3/5656: #0: (&bdev->bd_mutex){+.+.}, at: [<0000000080d6c150>] __blkdev_get+0x158/0x10e0 fs/block_dev.c:1439 #1: (loop_index_mutex){+.+.}, at: [<0000000020bd5587>] lo_open+0x1b/0xa0 drivers/block/loop.c:1571 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 670 Comm: khungtaskd Not tainted 4.15.0-rc2-next-20171207+ #62 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+0x194/0x257 lib/dump_stack.c:53 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x122/0x180 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+0x37a/0x440 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54