INFO: task syz-executor.1:8890 blocked for more than 143 seconds. Not tainted 5.11.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:11400 pid: 8890 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x3f2/0x9b0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 wb_wait_for_completion+0x5b/0x90 fs/fs-writeback.c:209 sync_inodes_sb+0xda/0x4a0 fs/fs-writeback.c:2555 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem+0x4f/0x80 fs/sync.c:67 generic_shutdown_super+0x1d/0x100 fs/super.c:448 kill_block_super+0x1c/0x40 fs/super.c:1393 deactivate_locked_super+0x24/0x60 fs/super.c:335 cleanup_mnt+0xb3/0x140 fs/namespace.c:1118 task_work_run+0x68/0xb0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x1df/0x200 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4608e7 RSP: 002b:00007ffdc0fb9338 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 000000000000db81 RCX: 00000000004608e7 RDX: 00000000004031f8 RSI: 0000000000000002 RDI: 00007ffdc0fb93e0 RBP: 0000000000000009 R08: 0000000000000000 R09: 0000000000000009 R10: 0000000000000005 R11: 0000000000000246 R12: 00007ffdc0fba470 R13: 0000000001943a60 R14: 0000000000000000 R15: 00007ffdc0fba470 INFO: task syz-executor.3:8893 blocked for more than 143 seconds. Not tainted 5.11.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:11400 pid: 8893 ppid: 8891 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x3f2/0x9b0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 wb_wait_for_completion+0x5b/0x90 fs/fs-writeback.c:209 sync_inodes_sb+0xda/0x4a0 fs/fs-writeback.c:2555 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem+0x4f/0x80 fs/sync.c:67 generic_shutdown_super+0x1d/0x100 fs/super.c:448 kill_block_super+0x1c/0x40 fs/super.c:1393 deactivate_locked_super+0x24/0x60 fs/super.c:335 cleanup_mnt+0xb3/0x140 fs/namespace.c:1118 task_work_run+0x68/0xb0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x1df/0x200 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4608e7 RSP: 002b:00007ffc9c5b3458 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 000000000000e2d6 RCX: 00000000004608e7 RDX: 00000000004031f8 RSI: 0000000000000002 RDI: 00007ffc9c5b3500 RBP: 000000000000000f R08: 0000000000000000 R09: 0000000000000009 R10: 0000000000000005 R11: 0000000000000246 R12: 00007ffc9c5b4590 R13: 000000000196fa60 R14: 0000000000000000 R15: 00007ffc9c5b4590 INFO: task syz-executor.2:8894 blocked for more than 143 seconds. Not tainted 5.11.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:11512 pid: 8894 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x3f2/0x9b0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 wb_wait_for_completion+0x5b/0x90 fs/fs-writeback.c:209 sync_inodes_sb+0xda/0x4a0 fs/fs-writeback.c:2555 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem+0x4f/0x80 fs/sync.c:67 generic_shutdown_super+0x1d/0x100 fs/super.c:448 kill_block_super+0x1c/0x40 fs/super.c:1393 deactivate_locked_super+0x24/0x60 fs/super.c:335 cleanup_mnt+0xb3/0x140 fs/namespace.c:1118 task_work_run+0x68/0xb0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x1df/0x200 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4608e7 RSP: 002b:00007fffda99b908 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 000000000000dc40 RCX: 00000000004608e7 RDX: 00000000004031f8 RSI: 0000000000000002 RDI: 00007fffda99b9b0 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000009 R10: 0000000000000005 R11: 0000000000000246 R12: 00007fffda99ca40 R13: 000000000183da60 R14: 0000000000000000 R15: 00007fffda99ca40 INFO: task syz-executor.0:8896 blocked for more than 143 seconds. Not tainted 5.11.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:11400 pid: 8896 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x3f2/0x9b0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 wb_wait_for_completion+0x5b/0x90 fs/fs-writeback.c:209 sync_inodes_sb+0xda/0x4a0 fs/fs-writeback.c:2555 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem+0x4f/0x80 fs/sync.c:67 generic_shutdown_super+0x1d/0x100 fs/super.c:448 kill_block_super+0x1c/0x40 fs/super.c:1393 deactivate_locked_super+0x24/0x60 fs/super.c:335 cleanup_mnt+0xb3/0x140 fs/namespace.c:1118 task_work_run+0x68/0xb0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x1df/0x200 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4608e7 RSP: 002b:00007ffc21213028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 000000000000d9cf RCX: 00000000004608e7 RDX: 00000000004031f8 RSI: 0000000000000002 RDI: 00007ffc212130d0 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000009 R10: 0000000000000005 R11: 0000000000000246 R12: 00007ffc21214160 R13: 00000000024b6a60 R14: 0000000000000000 R15: 00007ffc21214160 INFO: task syz-executor.5:8899 blocked for more than 144 seconds. Not tainted 5.11.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:11312 pid: 8899 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x3f2/0x9b0 kernel/sched/core.c:5064 schedule+0x38/0xe0 kernel/sched/core.c:5143 wb_wait_for_completion+0x5b/0x90 fs/fs-writeback.c:209 sync_inodes_sb+0xda/0x4a0 fs/fs-writeback.c:2555 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem+0x4f/0x80 fs/sync.c:67 generic_shutdown_super+0x1d/0x100 fs/super.c:448 kill_block_super+0x1c/0x40 fs/super.c:1393 deactivate_locked_super+0x24/0x60 fs/super.c:335 cleanup_mnt+0xb3/0x140 fs/namespace.c:1118 task_work_run+0x68/0xb0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x1df/0x200 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4608e7 RSP: 002b:00007ffe455d8708 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 000000000000e0e4 RCX: 00000000004608e7 RDX: 00000000004031f8 RSI: 0000000000000002 RDI: 00007ffe455d87b0 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000009 R10: 0000000000000005 R11: 0000000000000246 R12: 00007ffe455d9840 R13: 0000000002d00a60 R14: 0000000000000000 R15: 00007ffe455d9840 Showing all locks held in the system: 2 locks held by kworker/u4:0/8: #0: ffff888140cbd538 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff888140cbd538 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888140cbd538 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x207/0x610 kernel/workqueue.c:2246 #1: ffffc90000c97e70 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #1: ffffc90000c97e70 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #1: ffffc90000c97e70 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x207/0x610 kernel/workqueue.c:2246 2 locks held by kworker/u4:1/22: #0: ffff888140cbd538 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff888140cbd538 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888140cbd538 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x207/0x610 kernel/workqueue.c:2246 #1: ffffc90000d13e70 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #1: ffffc90000d13e70 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #1: ffffc90000d13e70 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x207/0x610 kernel/workqueue.c:2246 2 locks held by kworker/u4:4/738: 2 locks held by kworker/u4:5/948: #0: ffff888140cbd538 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff888140cbd538 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888140cbd538 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x207/0x610 kernel/workqueue.c:2246 #1: ffffc90000d5be70 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #1: ffffc90000d5be70 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #1: ffffc90000d5be70 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x207/0x610 kernel/workqueue.c:2246 2 locks held by kworker/u4:7/1310: #0: ffff888140cbd538 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff888140cbd538 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888140cbd538 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x207/0x610 kernel/workqueue.c:2246 #1: ffffc90003463e70 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #1: ffffc90003463e70 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #1: ffffc90003463e70 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x207/0x610 kernel/workqueue.c:2246 1 lock held by khungtaskd/1665: #0: ffffffff85007860 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x15/0x1a6 kernel/locking/lockdep.c:6255 1 lock held by in:imklog/8013: #0: ffff8881075efaf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x45/0x50 fs/file.c:947 2 locks held by syz-executor.1/8890: #0: ffff88811fc7e0e0 (&type->s_umount_key#50){+.+.}-{3:3}, at: deactivate_super+0x3e/0x50 fs/super.c:365 #1: ffff88810238a708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:344 [inline] #1: ffff88810238a708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0xc0/0x4a0 fs/fs-writeback.c:2553 2 locks held by syz-executor.3/8893: #0: ffff8881200ea0e0 (&type->s_umount_key#50){+.+.}-{3:3}, at: deactivate_super+0x3e/0x50 fs/super.c:365 #1: ffff888102389708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:344 [inline] #1: ffff888102389708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0xc0/0x4a0 fs/fs-writeback.c:2553 2 locks held by syz-executor.2/8894: #0: ffff88811fc250e0 (&type->s_umount_key#50){+.+.}-{3:3}, at: deactivate_super+0x3e/0x50 fs/super.c:365 #1: ffff88810238d708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:344 [inline] #1: ffff88810238d708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0xc0/0x4a0 fs/fs-writeback.c:2553 2 locks held by syz-executor.0/8896: #0: ffff88811fa1e0e0 (&type->s_umount_key#50){+.+.}-{3:3}, at: deactivate_super+0x3e/0x50 fs/super.c:365 #1: ffff88810238b708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:344 [inline] #1: ffff88810238b708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0xc0/0x4a0 fs/fs-writeback.c:2553 2 locks held by syz-executor.5/8899: #0: ffff88811fb670e0 (&type->s_umount_key#50){+.+.}-{3:3}, at: deactivate_super+0x3e/0x50 fs/super.c:365 #1: ffff88810238c708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:344 [inline] #1: ffff88810238c708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0xc0/0x4a0 fs/fs-writeback.c:2553 3 locks held by kworker/u4:9/10471: #0: ffff88813bc2ca18 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x45c/0x640 kernel/sched/fair.c:10642 #1: ffffffff85007860 (rcu_read_lock){....}-{1:2}, at: __update_idle_core+0x0/0x2b0 kernel/sched/fair.c:5235 #2: ffff88813bc1c898 (&base->lock){..-.}-{2:2}, at: __mod_timer kernel/time/timer.c:1041 [inline] #2: ffff88813bc1c898 (&base->lock){..-.}-{2:2}, at: add_timer+0xfe/0x280 kernel/time/timer.c:1142 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1665 Comm: khungtaskd Not tainted 5.11.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x77/0x97 lib/dump_stack.c:120 nmi_cpu_backtrace.cold.8+0x68/0x82 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0xd5/0xf0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0x5f1/0x6f0 kernel/hung_task.c:294 kthread+0x144/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_idle_do_entry+0x4f/0x60 drivers/acpi/processor_idle.c:516