INFO: task syz.3.328:9138 blocked for more than 143 seconds. Not tainted 6.16.0-rc4-syzkaller-00013-g66701750d556 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.328 state:D stack:25736 pid:9138 tgid:9081 ppid:7650 task_flags:0x400040 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0x165/0x360 kernel/sched/core.c:6878 percpu_rwsem_wait+0x2e3/0x330 kernel/locking/percpu-rwsem.c:164 __percpu_down_read+0xf0/0x130 kernel/locking/percpu-rwsem.c:180 percpu_down_read_internal include/linux/percpu-rwsem.h:67 [inline] percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] __sb_start_write include/linux/fs.h:1795 [inline] sb_start_write include/linux/fs.h:1931 [inline] file_start_write+0x1ff/0x250 include/linux/fs.h:3096 direct_splice_actor+0x49/0x160 fs/splice.c:1157 splice_direct_to_actor+0x5a5/0xcc0 fs/splice.c:1102 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0x181/0x270 fs/splice.c:1227 do_sendfile+0x4da/0x7e0 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcf9e18e929 RSP: 002b:00007fcf9ef16038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fcf9e3b6160 RCX: 00007fcf9e18e929 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000004 RBP: 00007fcf9e210b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000fffe80 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fcf9e3b6160 R15: 00007fff13356838 Showing all locks held in the system: 1 lock held by ksoftirqd/1/23: #0: ffff8880b8739e18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:606 1 lock held by khungtaskd/31: #0: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770 2 locks held by getty/5588: #0: ffff888034f620a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222 3 locks held by kworker/u9:8/5840: #0: ffff88802785c148 ((wq_completion)hci2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff88802785c148 ((wq_completion)hci2){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3321 #1: ffffc900043dfbc0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc900043dfbc0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3321 #2: ffff888034118dc0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d4/0x3a0 net/bluetooth/hci_sync.c:331 1 lock held by syz.3.328/9138: #0: ffff8880335ca428 (sb_writers#15){++++}-{0:0}, at: direct_splice_actor+0x49/0x160 fs/splice.c:1157 3 locks held by syz.0.624/11796: 7 locks held by syz.7.638/11762: 1 lock held by syz.8.640/11773: 8 locks held by dhcpcd-run-hook/11805: ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc4-syzkaller-00013-g66701750d556 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline] watchdog+0xfee/0x1030 kernel/hung_task.c:470 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 11773 Comm: syz.8.640 Not tainted 6.16.0-rc4-syzkaller-00013-g66701750d556 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:do_raw_spin_lock+0x0/0x290 kernel/locking/spinlock_debug.c:114 Code: ff 89 d9 80 e1 07 80 c1 03 38 c1 7c 90 48 89 df e8 75 e1 82 00 eb 86 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 RSP: 0018:ffffc9000c4d6ef8 EFLAGS: 00000096 RAX: a37549102948c700 RBX: ffff888142b570c8 RCX: a37549102948c700 RDX: 0000000000000000 RSI: ffffffff8db5a5e7 RDI: ffff888142b570c8 RBP: ffffc9000c4d6f80 R08: 0000000000000000 R09: ffffffff85fa4a9c R10: dffffc0000000000 R11: fffffbfff1f3fb5f R12: ffff888142b57000 R13: ffff8880250723e8 R14: 1ffff9200189ade0 R15: dffffc0000000000 FS: 00007f6013d6a6c0(0000) GS:ffff888125d84000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564d525d7950 CR3: 00000000468ac000 CR4: 00000000003526f0 Call Trace: __raw_spin_lock_irq include/linux/spinlock_api_smp.h:120 [inline] _raw_spin_lock_irq+0xae/0xf0 kernel/locking/spinlock.c:170 spin_lock_irq include/linux/spinlock.h:376 [inline] loop_queue_work drivers/block/loop.c:794 [inline] loop_queue_rq+0x23c/0xb00 drivers/block/loop.c:1857 __blk_mq_issue_directly block/blk-mq.c:2693 [inline] blk_mq_request_issue_directly+0x3c1/0x710 block/blk-mq.c:2780 blk_mq_issue_direct+0x2a0/0x660 block/blk-mq.c:2801 blk_mq_dispatch_queue_requests+0x6fe/0x800 block/blk-mq.c:2876 blk_mq_flush_plug_list+0x432/0x550 block/blk-mq.c:2959 __blk_flush_plug+0x3d3/0x4b0 block/blk-core.c:1220 blk_finish_plug block/blk-core.c:1247 [inline] __submit_bio+0x2d3/0x5a0 block/blk-core.c:649 __submit_bio_noacct_mq block/blk-core.c:722 [inline] submit_bio_noacct_nocheck+0x4ab/0xb50 block/blk-core.c:751 submit_bio_wait+0x104/0x200 block/bio.c:1361 bdev_rw_virt+0x331/0x4c0 block/bio.c:1392 xlog_do_io+0x17a/0x360 fs/xfs/xfs_log_recover.c:140 xlog_bread+0x30/0xc0 fs/xfs/xfs_log_recover.c:171 xlog_rseek_logrec_hdr+0xfa/0x480 fs/xfs/xfs_log_recover.c:787 xlog_find_tail+0xfb/0x840 fs/xfs/xfs_log_recover.c:1276 xlog_recover+0x4b/0x3e0 fs/xfs/xfs_log_recover.c:3419 xfs_log_mount+0x253/0x3e0 fs/xfs/xfs_log.c:667 xfs_mountfs+0xe5e/0x2330 fs/xfs/xfs_mount.c:1036 xfs_fs_fill_super+0x11b3/0x1600 fs/xfs/xfs_super.c:1965 get_tree_bdev_flags+0x40b/0x4d0 fs/super.c:1681 vfs_get_tree+0x8f/0x2b0 fs/super.c:1804 do_new_mount+0x24a/0xa40 fs/namespace.c:3902 do_mount fs/namespace.c:4239 [inline] __do_sys_mount fs/namespace.c:4450 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4427 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6012f900ca Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6013d69e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f6013d69ef0 RCX: 00007f6012f900ca RDX: 0000200000000500 RSI: 0000200000000000 RDI: 00007f6013d69eb0 RBP: 0000200000000500 R08: 00007f6013d69ef0 R09: 0000000002218a5d R10: 0000000002218a5d R11: 0000000000000246 R12: 0000200000000000 R13: 00007f6013d69eb0 R14: 00000000000096a4 R15: 0000200000000140