INFO: task syz-executor.2:28502 blocked for more than 143 seconds. Not tainted 6.1.0-rc4-syzkaller-00362-gfef7fd48922d #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:26248 pid:28502 ppid:3646 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5191 [inline] __schedule+0xae9/0x53f0 kernel/sched/core.c:6503 schedule+0xda/0x1b0 kernel/sched/core.c:6579 io_schedule+0xba/0x130 kernel/sched/core.c:8723 folio_wait_bit_common+0x394/0x9b0 mm/filemap.c:1296 __folio_lock mm/filemap.c:1659 [inline] folio_lock include/linux/pagemap.h:939 [inline] folio_lock include/linux/pagemap.h:935 [inline] __filemap_get_folio+0xb76/0xd90 mm/filemap.c:1931 truncate_inode_pages_range+0x382/0x1020 mm/truncate.c:378 kill_bdev block/bdev.c:76 [inline] blkdev_flush_mapping+0x140/0x2f0 block/bdev.c:662 blkdev_put_whole+0xd1/0xf0 block/bdev.c:693 blkdev_put+0x226/0x770 block/bdev.c:953 blkdev_close+0x64/0x80 block/fops.c:499 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16b/0x270 kernel/task_work.c:179 get_signal+0x1c3/0x2430 kernel/signal.c:2635 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:296 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fc7b028b639 RSP: 002b:00007fc7af5bd168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: fffffffffffffffc RBX: 00007fc7b03ac1f0 RCX: 00007fc7b028b639 RDX: 0000000020000140 RSI: 0000000000000006 RDI: 000000000000000a RBP: 00007fc7b02e67e1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000de1 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdb9f6c63f R14: 00007fc7af5bd300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8bf87e30 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/13: #0: ffffffff8bf87b30 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/27: #0: ffffffff8bf88980 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6494 1 lock held by udevd/2971: 2 locks held by getty/3283: #0: ffff88814a78a098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef0/0x13e0 drivers/tty/n_tty.c:2177 1 lock held by syz-executor.2/28502: #0: ffff88801e4cd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xbc/0x770 block/bdev.c:911 1 lock held by syz-executor.2/28639: #0: ffff88801e4cd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb90 block/bdev.c:813 1 lock held by syz-executor.2/28640: #0: ffff88801e4cd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb90 block/bdev.c:813 1 lock held by syz-executor.2/28702: #0: ffff88801e4cd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb90 block/bdev.c:813 1 lock held by syz-executor.2/28703: #0: ffff88801e4cd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb90 block/bdev.c:813 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 6.1.0-rc4-syzkaller-00362-gfef7fd48922d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x24/0x18a lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x32f/0x3c0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xc71/0xfc0 kernel/hung_task.c:377 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.1.0-rc4-syzkaller-00362-gfef7fd48922d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:lock_release+0x3e/0x810 kernel/locking/lockdep.c:5676 Code: fc 55 53 48 81 ec 90 00 00 00 48 8d 6c 24 10 48 89 74 24 08 48 c7 44 24 10 b3 8a b5 41 48 c1 ed 03 48 c7 44 24 18 00 d1 79 8b <48> 01 e8 48 c7 44 24 20 b0 c0 5f 81 c7 00 f1 f1 f1 f1 c7 40 04 f1 RSP: 0018:ffffc90000147b68 EFLAGS: 00000016 RAX: dffffc0000000000 RBX: 0000000000000212 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff84081120 RDI: ffffffff9149cfe8 RBP: 1ffff92000028f6f R08: ffffffff9149cfd0 R09: 0000000000000000 R10: fffff52000028f77 R11: 0000000000000001 R12: ffffffff9149cfe8 R13: ffffffff89ee1d40 R14: 1ffff92000028f8d R15: ffff88808d3a75b8 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c022e0d380 CR3: 0000000027499000 CR4: 0000000000350ef0 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline] _raw_spin_unlock_irqrestore+0x16/0x70 kernel/locking/spinlock.c:194 debug_object_active_state lib/debugobjects.c:942 [inline] debug_object_active_state+0x260/0x350 lib/debugobjects.c:911 debug_rcu_head_unqueue kernel/rcu/rcu.h:198 [inline] rcu_do_batch kernel/rcu/tree.c:2243 [inline] rcu_core+0x7c8/0x1980 kernel/rcu/tree.c:2510 __do_softirq+0x1f7/0xad8 kernel/softirq.c:571 run_ksoftirqd kernel/softirq.c:934 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:926 smpboot_thread_fn+0x645/0xa00 kernel/smpboot.c:164 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306