INFO: task syz-executor.5:8384 blocked for more than 143 seconds. Not tainted 5.1.0-rc3+ #51 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D24608 8384 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 io_schedule+0x1c/0x70 kernel/sched/core.c:5183 wait_on_page_bit_common+0x518/0xd00 mm/filemap.c:1141 wait_on_page_bit mm/filemap.c:1190 [inline] wait_on_page_writeback include/linux/pagemap.h:536 [inline] __filemap_fdatawait_range+0x3ec/0x530 mm/filemap.c:518 filemap_fdatawait_keep_errors+0x2d/0xd0 mm/filemap.c:591 wait_sb_inodes fs/fs-writeback.c:2333 [inline] sync_inodes_sb+0x6b6/0xae0 fs/fs-writeback.c:2455 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x16a/0x270 fs/sync.c:48 generic_shutdown_super+0x75/0x370 fs/super.c:444 kill_block_super+0xa0/0x100 fs/super.c:1373 deactivate_locked_super+0x9a/0x100 fs/super.c:331 deactivate_super fs/super.c:362 [inline] deactivate_super+0x1b2/0x1d0 fs/super.c:358 cleanup_mnt+0xbf/0x160 fs/namespace.c:1119 __cleanup_mnt+0x16/0x20 fs/namespace.c:1126 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ad07 Code: Bad RIP value. RSP: 002b:00007ffe9b2a5218 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000045ad07 RDX: 0000000000402f50 RSI: 0000000000000002 RDI: 00007ffe9b2a52c0 RBP: 0000000000000244 R08: 000000000000c802 R09: 000000000000000b R10: 0000000000000005 R11: 0000000000000202 R12: 00007ffe9b2a6350 R13: 0000000000e15940 R14: 0000000000000000 R15: 00007ffe9b2a6350 Showing all locks held in the system: 1 lock held by khungtaskd/1013: #0: 000000001c42e205 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5061 1 lock held by rsyslogd/8209: #0: 000000001935083c (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8331: #0: 00000000210700af (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000009bfee2bf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8332: #0: 00000000da135418 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000f70a0301 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8333: #0: 00000000f720469a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000007453a842 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8334: #0: 000000002ed7e1b6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000a1c16bfb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8335: #0: 00000000d605c2c5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000a1c2cc88 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8336: #0: 0000000037d2702d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000b8c3ae8e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8337: #0: 000000005a99daca (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000004b3ee8cc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.5/8384: #0: 00000000618e6a76 (&type->s_umount_key#60){+.+.}, at: deactivate_super fs/super.c:361 [inline] #0: 00000000618e6a76 (&type->s_umount_key#60){+.+.}, at: deactivate_super+0x1aa/0x1d0 fs/super.c:358 #1: 000000004bd27264 (&s->s_sync_lock){+.+.}, at: wait_sb_inodes fs/fs-writeback.c:2272 [inline] #1: 000000004bd27264 (&s->s_sync_lock){+.+.}, at: sync_inodes_sb+0x22d/0xae0 fs/fs-writeback.c:2455 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1013 Comm: khungtaskd Not tainted 5.1.0-rc3+ #51 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:204 [inline] watchdog+0x9b7/0xec0 kernel/hung_task.c:288 kthread+0x357/0x430 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: