INFO: task syz-executor:4175 blocked for more than 143 seconds. Not tainted 5.15.178-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:20792 pid: 4175 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5027 [inline] __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373 schedule+0x11b/0x1f0 kernel/sched/core.c:6456 io_schedule+0x88/0x100 kernel/sched/core.c:8481 wait_on_page_bit_common+0xa13/0x1180 mm/filemap.c:1356 lock_page include/linux/pagemap.h:625 [inline] truncate_inode_pages_range+0xc17/0x1290 mm/truncate.c:394 evict+0x53c/0x930 fs/inode.c:624 dispose_list fs/inode.c:655 [inline] evict_inodes+0x668/0x700 fs/inode.c:709 generic_shutdown_super+0x94/0x310 fs/super.c:454 kill_block_super+0x7a/0xe0 fs/super.c:1427 deactivate_locked_super+0xa0/0x110 fs/super.c:335 cleanup_mnt+0x44e/0x500 fs/namespace.c:1143 task_work_run+0x129/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fc99d1b4497 RSP: 002b:00007ffe17e76f38 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007fc99d23408c RCX: 00007fc99d1b4497 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe17e76ff0 RBP: 00007ffe17e76ff0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe17e78080 R13: 00007fc99d23408c R14: 0000000000036b60 R15: 00007ffe17e780c0 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8cb1fce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 1 lock held by udevd/3546: #0: ffff8880204bdd18 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x14d/0xa50 block/bdev.c:817 2 locks held by getty/3922: #0: ffff88814d0f3098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252 #1: ffffc900026362e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158 1 lock held by syz-executor/4175: #0: ffff888060dc80e0 (&type->s_umount_key#74){+.+.}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:365 2 locks held by syz-executor/4177: #0: ffff8880204bf918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xfb/0x790 block/bdev.c:912 #1: ffff888020629468 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0xa9/0xbe0 drivers/block/loop.c:1365 1 lock held by udevd/6913: #0: ffff8880204c5518 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x14d/0xa50 block/bdev.c:817 2 locks held by syz.3.5816/17301: #0: ffff8880204bdd18 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xfb/0x790 block/bdev.c:912 #1: ffff88802056e468 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:2070 2 locks held by syz.6.5825/17320: #0: ffff8880204c7118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xfb/0x790 block/bdev.c:912 #1: ffff88802062f468 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:2070 2 locks held by syz.5.5829/17326: #0: ffff8880204c5518 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xfb/0x790 block/bdev.c:912 #1: ffff88802062c468 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:2070 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.178-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xe72/0xeb0 kernel/hung_task.c:295 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4210 Comm: kworker/1:4 Not tainted 5.15.178-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: events nsim_dev_trap_report_work RIP: 0010:trace_irq_disable_rcuidle+0x1/0x190 include/trace/events/preemptirq.h:36 Code: f0 00 31 ff e8 90 80 f9 ff 81 e5 00 00 f0 00 74 08 e8 23 7d f9 ff 5b 5d c3 e8 1b 7d f9 ff 48 89 df 31 f6 5b 5d eb 02 66 90 55 <41> 57 41 56 53 49 89 f6 48 89 fb e8 ff 7c f9 ff 66 90 e8 f8 7c f9 RSP: 0018:ffffc9000312f8b0 EFLAGS: 00000046 RAX: ffffffff81870875 RBX: 0000000000000200 RCX: ffff88807cb2bb80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff848937e6 RBP: ffffc9000312fa10 R08: ffffffff81870860 R09: ffffc9000312fac0 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000002 R13: dffffc0000000000 R14: 0000000000000246 R15: 000000010000286e FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555629835c8 CR3: 000000001e680000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: crng_make_state+0x196/0x690 drivers/char/random.c:367 _get_random_bytes+0xd3/0x2b0 drivers/char/random.c:405 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:692 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:721 [inline] nsim_dev_trap_report_work+0x65c/0xab0 drivers/net/netdevsim/dev.c:762 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287