INFO: task syz-executor157:5205 blocked for more than 143 seconds. Not tainted 6.2.0-rc2-syzkaller-00313-g9b43a525db12 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor157 state:D stack:26936 pid:5205 ppid:5091 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x9d1/0xe40 kernel/sched/core.c:6555 schedule+0xcb/0x190 kernel/sched/core.c:6631 blk_mq_freeze_queue_wait+0x105/0x190 block/blk-mq.c:180 nbd_add_socket+0x17b/0x8e0 drivers/block/nbd.c:1122 __nbd_ioctl drivers/block/nbd.c:1465 [inline] nbd_ioctl+0x1d5/0x5b0 drivers/block/nbd.c:1522 blkdev_ioctl+0x3c9/0x7c0 block/ioctl.c:616 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fe09f221239 RSP: 002b:00007fe09f1ce308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe09f2a5408 RCX: 00007fe09f221239 RDX: 0000000000000004 RSI: 000000000000ab00 RDI: 0000000000000003 RBP: 00007fe09f2a5400 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe09f2a540c R13: 00007fe09f2721a4 R14: 64626e2f7665642f R15: 0000000000022000 INFO: task syz-executor157:5207 blocked for more than 143 seconds. Not tainted 6.2.0-rc2-syzkaller-00313-g9b43a525db12 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor157 state:D stack:28904 pid:5207 ppid:5091 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x9d1/0xe40 kernel/sched/core.c:6555 schedule+0xcb/0x190 kernel/sched/core.c:6631 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6690 __mutex_lock_common+0xecf/0x26c0 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 nbd_ioctl+0xd7/0x5b0 drivers/block/nbd.c:1515 blkdev_ioctl+0x3c9/0x7c0 block/ioctl.c:616 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fe09f221239 RSP: 002b:00007fe09f1ad308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe09f2a5418 RCX: 00007fe09f221239 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 00007fe09f2a5410 R08: 00007fe09f1ad700 R09: 0000000000000000 R10: 00007fe09f1ad700 R11: 0000000000000246 R12: 00007fe09f2a541c R13: 00007fe09f2721a4 R14: 64626e2f7665642f R15: 0000000000022000 INFO: task udevd:5206 blocked for more than 143 seconds. Not tainted 6.2.0-rc2-syzkaller-00313-g9b43a525db12 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:26328 pid:5206 ppid:4422 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x9d1/0xe40 kernel/sched/core.c:6555 schedule+0xcb/0x190 kernel/sched/core.c:6631 io_schedule+0x83/0x100 kernel/sched/core.c:8811 folio_wait_bit_common+0x8ca/0x1390 mm/filemap.c:1297 folio_put_wait_locked mm/filemap.c:1466 [inline] do_read_cache_folio+0xb9/0x790 mm/filemap.c:3535 read_mapping_folio include/linux/pagemap.h:761 [inline] read_part_sector+0xcb/0x360 block/partitions/core.c:717 adfspart_check_ICS+0xd4/0x950 block/partitions/acorn.c:360 check_partition block/partitions/core.c:146 [inline] blk_add_partitions block/partitions/core.c:602 [inline] bdev_disk_changed+0x79d/0x1420 block/partitions/core.c:688 blkdev_get_whole+0x342/0x3d0 block/bdev.c:685 blkdev_get_by_dev+0x300/0xa60 block/bdev.c:822 blkdev_open+0x128/0x2e0 block/fops.c:478 do_dentry_open+0x85f/0x11b0 fs/open.c:882 do_open fs/namei.c:3557 [inline] path_openat+0x25cc/0x2de0 fs/namei.c:3714 do_filp_open+0x275/0x500 fs/namei.c:3741 do_sys_openat2+0x13b/0x500 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fdf33f25697 RSP: 002b:00007ffd88d5f390 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000055c149591dd0 RCX: 00007fdf33f25697 RDX: 00000000000a0800 RSI: 000055c149569680 RDI: 00000000ffffff9c RBP: 000055c149569680 R08: 0000000000000001 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800 R13: 000055c14958c290 R14: 00007ffd88d5f43c R15: 000055c149568910 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8d5239d0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/13: #0: ffffffff8d5241d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/28: #0: ffffffff8d523800 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by getty/4740: #0: ffff88802c5ab098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc900015802f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6e8/0x1e50 drivers/tty/n_tty.c:2177 1 lock held by syz-executor157/5205: #0: ffff88801f4081a0 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0xd7/0x5b0 drivers/block/nbd.c:1515 1 lock held by syz-executor157/5207: #0: ffff88801f4081a0 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0xd7/0x5b0 drivers/block/nbd.c:1515 1 lock held by udevd/5206: #0: ffff888146a5c4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xfe/0xa60 block/bdev.c:813 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.2.0-rc2-syzkaller-00313-g9b43a525db12 #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+0x1e3/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x4e3/0x560 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x19b/0x3e0 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+0xcd5/0xd20 kernel/hung_task.c:377 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9 Comm: kworker/u4:0 Not tainted 6.2.0-rc2-syzkaller-00313-g9b43a525db12 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:match_held_lock+0x17/0xb0 kernel/locking/lockdep.c:5117 Code: 8f ff 8d f6 0f 0b e9 38 ff ff ff e8 93 fa ff ff 0f 1f 00 55 53 bd 01 00 00 00 48 39 77 10 74 67 48 89 fb 81 7f 20 00 00 10 00 <72> 59 48 8b 46 08 48 85 c0 75 11 31 ed 48 89 f7 31 f6 e8 82 fe ff RSP: 0018:ffffc900000e7820 EFLAGS: 00000087 RAX: 0000000000000003 RBX: ffff88813fee0a88 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8d523780 RDI: ffff88813fee0a88 RBP: 0000000000000001 R08: dffffc0000000000 R09: ffffc900000e7a60 R10: fffff5200001cf51 R11: 1ffff9200001cf4c R12: 0000000000000246 R13: ffff88813fee0000 R14: 00000000ffffffff R15: ffffffff8d523780 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f37a890e310 CR3: 000000000d28e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_is_held kernel/locking/lockdep.c:5409 [inline] lock_is_held_type+0xb1/0x190 kernel/locking/lockdep.c:5711 lock_is_held include/linux/lockdep.h:283 [inline] __might_resched+0xdf/0x6a0 kernel/sched/core.c:9947 __mutex_lock_common+0xd2/0x26c0 kernel/locking/mutex.c:580 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 jump_label_lock kernel/jump_label.c:27 [inline] static_key_disable_cpuslocked+0x95/0x1b0 kernel/jump_label.c:233 static_key_disable+0x16/0x20 kernel/jump_label.c:243 toggle_allocation_gate+0x1b8/0x250 mm/kfence/core.c:804 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308