INFO: task syz-executor.0:5648 blocked for more than 143 seconds. Not tainted 6.11.0-rc5-next-20240827-syzkaller-g6f923748057a #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27360 pid:5648 tgid:5647 ppid:5515 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5311 [inline] __schedule+0x184a/0x4b30 kernel/sched/core.c:6677 __schedule_loop kernel/sched/core.c:6754 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6769 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6826 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752 bdev_release+0x17e/0x700 block/bdev.c:1087 blkdev_release+0x15/0x20 block/fops.c:638 __fput+0x23f/0x880 fs/file_table.c:424 task_work_run+0x24f/0x310 kernel/task_work.c:228 get_signal+0x16ad/0x1810 kernel/signal.c:2690 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x4551e9 RSP: 002b:00007efe8acde0d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 000000000054cf00 RCX: 00000000004551e9 RDX: ffffffffffffffff RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 00000000004a06fd R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000049f8fd R13: 000000000000000b R14: 000000000054cf00 R15: 00007ffd2e32a328 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e939b60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e939b60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e939b60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720 2 locks held by getty/4983: #0: ffff88802cd320a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 1 lock held by udevd/5533: #0: ffff88801fefd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 1 lock held by syz-executor.0/5648: #0: ffff88801fefd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x17e/0x700 block/bdev.c:1087 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc5-next-20240827-syzkaller-g6f923748057a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xff4/0x1040 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 4673 Comm: klogd Not tainted 6.11.0-rc5-next-20240827-syzkaller-g6f923748057a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:__lock_acquire+0x141d/0x2050 kernel/locking/lockdep.c:5235 Code: 45 00 83 f8 30 0f 83 68 02 00 00 3b 05 dc 58 0b 12 0f 87 c7 02 00 00 41 be 01 00 00 00 44 89 f0 48 81 c4 90 00 00 00 5b 41 5c <41> 5d 41 5e 41 5f 5d c3 cc cc cc cc 49 89 d6 e8 7f 75 04 00 48 c7 RSP: 0018:ffffc900035ff7b0 EFLAGS: 00000086 RAX: 0000000000000001 RBX: ffffc900035ff860 RCX: 994886e84d925100 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff937b7800 RBP: 83f6d220abfa2aa9 R08: ffffffff937b7807 R09: 1ffffffff26f6f00 R10: dffffc0000000000 R11: fffffbfff26f6f01 R12: 1ffff920006bff08 R13: ffff888076ec46d8 R14: 0000000000000001 R15: ffff888076ec4700 FS: 00007f135f7d7380(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558055ca7680 CR3: 00000000281c4000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 syslog_print+0x1d5/0x9c0 kernel/printk/printk.c:1589 do_syslog+0x3bb/0x810 kernel/printk/printk.c:1761 __do_sys_syslog kernel/printk/printk.c:1853 [inline] __se_sys_syslog kernel/printk/printk.c:1851 [inline] __x64_sys_syslog+0x7c/0x90 kernel/printk/printk.c:1851 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f135f938fa7 Code: 73 01 c3 48 8b 0d 81 ce 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 67 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 51 ce 0c 00 f7 d8 64 89 01 48 RSP: 002b:00007ffe5aa6b278 EFLAGS: 00000206 ORIG_RAX: 0000000000000067 RAX: ffffffffffffffda RBX: 00007f135fad74a0 RCX: 00007f135f938fa7 RDX: 00000000000003ff RSI: 00007f135fad74a0 RDI: 0000000000000002 RBP: 0000000000000000 R08: 0000000000000007 R09: 1f74c8b3df1ab520 R10: 0000000000004000 R11: 0000000000000206 R12: 00007f135fad74a0 R13: 00007f135fac7212 R14: 00007f135fad76d2 R15: 00007f135fad76d2