INFO: task syz-executor.1:7910 blocked for more than 143 seconds. Not tainted 5.1.0-rc5+ #77 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D24176 7910 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x813/0x1cc0 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: 0033:0x45b677 Code: d9 ff d0 48 8b 7c 24 30 48 8b 77 08 48 2b 74 24 28 64 48 89 3c 25 f8 ff ff ff 48 89 f4 89 44 24 18 c3 48 83 ec 40 48 83 e4 f0 <48> c7 44 24 30 00 00 00 00 48 89 54 24 28 48 89 df 48 89 d9 ff d0 RSP: 002b:00007ffc93a5bd18 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00000000000411d0 RCX: 000000000045b677 RDX: 0000000000403270 RSI: 0000000000000002 RDI: 00007ffc93a5bdc0 RBP: 000000000000006f R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000005 R11: 0000000000000202 R12: 00007ffc93a5ce50 R13: 0000000000f94940 R14: 0000000000000000 R15: 00007ffc93a5ce50 INFO: task syz-executor.5:7922 blocked for more than 143 seconds. Not tainted 5.1.0-rc5+ #77 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D24176 7922 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x813/0x1cc0 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: 0033:0x45b677 Code: d9 ff d0 48 8b 7c 24 30 48 8b 77 08 48 2b 74 24 28 64 48 89 3c 25 f8 ff ff ff 48 89 f4 89 44 24 18 c3 48 83 ec 40 48 83 e4 f0 <48> c7 44 24 30 00 00 00 00 48 89 54 24 28 48 89 df 48 89 d9 ff d0 RSP: 002b:00007ffcf0695598 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00000000000411d9 RCX: 000000000045b677 RDX: 0000000000403270 RSI: 0000000000000002 RDI: 00007ffcf0695640 RBP: 0000000000000066 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000005 R11: 0000000000000206 R12: 00007ffcf06966d0 R13: 0000000001aca940 R14: 0000000000000000 R15: 00007ffcf06966d0 Showing all locks held in the system: 1 lock held by khungtaskd/1042: #0: 00000000e59d24ab (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5057 1 lock held by rsyslogd/7745: #0: 00000000984f4caa (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/7868: #0: 00000000292c7189 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000def9d263 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7869: #0: 0000000065834c6b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000002dcaa2aa (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7870: #0: 0000000094b23496 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000080989c51 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7871: #0: 00000000ec48ecd5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000003d0b28af (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7872: #0: 000000001746a4bb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000009884b66d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7873: #0: 000000006bc0a21d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000754f1a59 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7874: #0: 00000000546473a8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000003da5b0db (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.1/7910: #0: 0000000056ba16ff (&type->s_umount_key#61){++++}, at: deactivate_super fs/super.c:361 [inline] #0: 0000000056ba16ff (&type->s_umount_key#61){++++}, at: deactivate_super+0x1aa/0x1d0 fs/super.c:358 #1: 00000000d4fe42ef (&s->s_sync_lock){+.+.}, at: wait_sb_inodes fs/fs-writeback.c:2272 [inline] #1: 00000000d4fe42ef (&s->s_sync_lock){+.+.}, at: sync_inodes_sb+0x22d/0xae0 fs/fs-writeback.c:2455 2 locks held by syz-executor.5/7922: #0: 000000005fe58136 (&type->s_umount_key#61){++++}, at: deactivate_super fs/super.c:361 [inline] #0: 000000005fe58136 (&type->s_umount_key#61){++++}, at: deactivate_super+0x1aa/0x1d0 fs/super.c:358 #1: 000000006a894197 (&s->s_sync_lock){+.+.}, at: wait_sb_inodes fs/fs-writeback.c:2272 [inline] #1: 000000006a894197 (&s->s_sync_lock){+.+.}, at: sync_inodes_sb+0x22d/0xae0 fs/fs-writeback.c:2455 3 locks held by kworker/u4:5/8932: #0: 000000003366518d (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:10078 [inline] #0: 000000003366518d (&rq->lock){-.-.}, at: pick_next_task_fair+0x1214/0x19a0 kernel/sched/fair.c:7087 #1: 00000000e59d24ab (rcu_read_lock){....}, at: __update_idle_core+0x45/0x3f0 kernel/sched/fair.c:6084 #2: 00000000f769655e (&base->lock){-.-.}, at: lock_timer_base+0x56/0x1b0 kernel/time/timer.c:937 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc5+ #77 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 0 to CPUs 1: