INFO: task syz-executor.2:19830 blocked for more than 143 seconds. Not tainted 6.8.0-rc5-syzkaller-00163-gffd2cb6b718e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:26104 pid:19830 tgid:19827 ppid:18010 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6874 rwsem_down_write_slowpath+0xeea/0x13b0 kernel/locking/rwsem.c:1178 __down_write_common+0x1ae/0x200 kernel/locking/rwsem.c:1306 filemap_invalidate_lock include/linux/fs.h:849 [inline] blk_ioctl_zeroout block/ioctl.c:185 [inline] blkdev_common_ioctl+0x1718/0x2880 block/ioctl.c:514 blkdev_ioctl+0x532/0x740 block/ioctl.c:628 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfe/0x170 fs/ioctl.c:857 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7fcd9d87dda9 RSP: 002b:00007fcd9e6af0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fcd9d9ac050 RCX: 00007fcd9d87dda9 RDX: 0000000020000180 RSI: 000000000000127f RDI: 0000000000000003 RBP: 00007fcd9d8ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fcd9d9ac050 R15: 00007ffd15f08098 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8e130c60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #0: ffffffff8e130c60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #0: ffffffff8e130c60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 2 locks held by kworker/u4:7/2394: #0: ffff888014c89538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline] #0: ffff888014c89538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706 #1: ffffc900095f7d20 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline] #1: ffffc900095f7d20 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706 2 locks held by getty/4826: #0: ffff88802ba930a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900031232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201 5 locks held by kworker/0:6/5259: #0: ffff88801beb2138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline] #0: ffff88801beb2138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706 #1: ffffc90004ba7d20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline] #1: ffffc90004ba7d20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706 #2: ffff888024184190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:990 [inline] #2: ffff888024184190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1fe/0x50f0 drivers/usb/core/hub.c:5811 #3: ffff8880a372e190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:990 [inline] #3: ffff8880a372e190 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8e/0x520 drivers/base/dd.c:1005 #4: ffff88808395d160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:990 [inline] #4: ffff88808395d160 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8e/0x520 drivers/base/dd.c:1005 1 lock held by syz-executor.3/13571: 1 lock held by syz-executor.2/19830: #0: ffff88801d0a94c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:849 [inline] #0: ffff88801d0a94c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:185 [inline] #0: ffff88801d0a94c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x1718/0x2880 block/ioctl.c:514 1 lock held by syz-executor.0/19987: #0: ffff88801d0a94c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:859 [inline] #0: ffff88801d0a94c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xf1/0x7c0 mm/readahead.c:225 1 lock held by syz-executor.0/20165: #0: ffff88801d0a94c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:859 [inline] #0: ffff88801d0a94c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xf1/0x7c0 mm/readahead.c:225 1 lock held by syz-executor.0/20516: #0: ffff88801d0a94c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:859 [inline] #0: ffff88801d0a94c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xf1/0x7c0 mm/readahead.c:225 1 lock held by udevd/20611: #0: ffff8880b943c958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:567 3 locks held by syz-executor.0/20734: 2 locks held by syz-executor.4/20745: 1 lock held by modprobe/20747: 2 locks held by modprobe/20751: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc5-syzkaller-00163-gffd2cb6b718e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 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:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xfaf/0xff0 kernel/hung_task.c:379 kthread+0x2f1/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 20747 Comm: modprobe Not tainted 6.8.0-rc5-syzkaller-00163-gffd2cb6b718e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:separate_irq_context kernel/locking/lockdep.c:4628 [inline] RIP: 0010:__lock_acquire+0xd38/0x1fd0 kernel/locking/lockdep.c:5121 Code: 84 c0 0f 85 f6 0b 00 00 48 8b 04 24 8b 18 48 85 db 74 59 83 fb 31 0f 83 e1 10 00 00 48 8d 04 9b 48 8b 4c 24 08 48 8d 5c c1 f8 <48> 89 d8 48 c1 e8 03 0f b6 04 38 84 c0 0f 85 22 0d 00 00 8b 1b 48 RSP: 0000:ffffc9000414fc70 EFLAGS: 00000083 RAX: 0000000000000005 RBX: ffff888021518ae0 RCX: ffff888021518ac0 RDX: 0000000000000000 RSI: 0000000000000008 RDI: dffffc0000000000 RBP: ffff888021518ae8 R08: ffffffff92c8c427 R09: 1ffffffff2591884 R10: dffffc0000000000 R11: fffffbfff2591885 R12: 51aa5165084179a0 R13: ffff888021518000 R14: 0000000000000000 R15: ffff888021518b08 FS: 00007f5a1f318380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005594daae52b8 CR3: 00000000ae9ae000 CR4: 0000000000350ef0 Call Trace: lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 rcu_lock_acquire include/linux/rcupdate.h:298 [inline] rcu_read_lock include/linux/rcupdate.h:750 [inline] vma_end_read+0x35/0x170 include/linux/mm.h:686 do_user_addr_fault arch/x86/mm/fault.c:1357 [inline] handle_page_fault arch/x86/mm/fault.c:1498 [inline] exc_page_fault+0x4bd/0x870 arch/x86/mm/fault.c:1554 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7f5a1f41e77b Code: 93 12 00 48 8d 34 18 48 39 cd 48 89 75 60 0f 95 c1 48 29 da 0f b6 c9 48 83 ca 01 48 c1 e1 02 48 09 d9 48 83 c9 01 48 89 48 08 <48> 89 56 08 4c 8d 40 10 e9 c0 00 00 00 8b 45 08 85 c0 0f 84 9c 00 RSP: 002b:00007ffe76c1ac10 EFLAGS: 00010206 RAX: 00005594daae4900 RBX: 00000000000009b0 RCX: 00000000000009b1 RDX: 000000000001fd51 RSI: 00005594daae52b0 RDI: 0000000000000004 RBP: 00007f5a1f547aa0 R08: 00007f5a1f548d30 R09: 00007f5a1f61fb5d R10: 00000000000000a9 R11: 0000000000000000 R12: 0000000000000056 R13: 0000000000000099 R14: 00007f5a1f547b00 R15: 0000000000000000