INFO: task syz.0.15:5404 blocked for more than 143 seconds. Not tainted 6.11.0-next-20240927-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.15 state:D stack:23808 pid:5404 tgid:5404 ppid:5321 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5315 [inline] __schedule+0x1895/0x4b30 kernel/sched/core.c:6675 __schedule_loop kernel/sched/core.c:6752 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6767 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824 __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:639 __fput+0x23f/0x880 fs/file_table.c:431 task_work_run+0x24f/0x310 kernel/task_work.c:228 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdb4fd7dff9 RSP: 002b:00007ffd996a0e28 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007fdb4ff37a80 RCX: 00007fdb4fd7dff9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007fdb4ff37a80 R08: 0000000000000006 R09: 00007ffd996a111f R10: 000000000003fdb4 R11: 0000000000000246 R12: 0000000000010945 R13: 00007ffd996a0f30 R14: 0000000000000032 R15: ffffffffffffffff INFO: task syz.0.15:5405 blocked for more than 143 seconds. Not tainted 6.11.0-next-20240927-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.15 state:D stack:26528 pid:5405 tgid:5404 ppid:5321 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5315 [inline] __schedule+0x1895/0x4b30 kernel/sched/core.c:6675 __schedule_loop kernel/sched/core.c:6752 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6767 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824 __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:639 __fput+0x23f/0x880 fs/file_table.c:431 task_work_run+0x24f/0x310 kernel/task_work.c:228 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdb4fd7dff9 RSP: 002b:00007fdb50b75038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007fdb4ff35f80 RCX: 00007fdb4fd7dff9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004 RBP: 00007fdb4fdf0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fdb4ff35f80 R15: 00007ffd996a0cc8 Showing all locks held in the system: 3 locks held by kworker/0:0/8: #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc900000d7d00 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc900000d7d00 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcd3308 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104 1 lock held by khungtaskd/30: #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720 5 locks held by kworker/u8:6/964: #0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90003a1fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90003a1fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcc6810 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:580 #3: ffffffff8fcd3308 (rtnl_mutex){+.+.}-{3:3}, at: cleanup_net+0x6af/0xcc0 net/core/net_namespace.c:616 #4: ffffffff8e93d378 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #4: ffffffff8e93d378 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976 2 locks held by dhcpcd/4900: #0: ffffffff8fcb7e28 (vlan_ioctl_mutex){+.+.}-{3:3}, at: sock_ioctl+0x661/0x8e0 net/socket.c:1309 #1: ffffffff8fcd3308 (rtnl_mutex){+.+.}-{3:3}, at: vlan_ioctl_handler+0x112/0x9d0 net/8021q/vlan.c:553 2 locks held by getty/4982: #0: ffff88814cd000a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002efe2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 1 lock held by udevd/5330: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 1 lock held by syz.0.15/5404: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x17e/0x700 block/bdev.c:1087 1 lock held by syz.0.15/5405: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x17e/0x700 block/bdev.c:1087 1 lock held by syz.0.16/5421: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 1 lock held by syz.0.16/5422: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 1 lock held by syz.0.17/5439: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 1 lock held by syz.0.17/5441: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 1 lock held by syz.0.18/5461: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 1 lock held by syz.0.18/5462: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 1 lock held by syz.0.19/5478: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 1 lock held by syz.0.19/5479: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 1 lock held by syz.0.20/5495: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 1 lock held by syz.0.20/5496: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 1 lock held by syz.0.21/5512: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 1 lock held by syz.0.21/5513: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 1 lock held by syz.0.22/5529: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 1 lock held by syz.0.22/5530: #0: ffff8880253594c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc50 block/bdev.c:904 7 locks held by syz-executor/6002: #0: ffff8880328c0420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2949 [inline] #0: ffff8880328c0420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679 #1: ffff88806f8be088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1ea/0x500 fs/kernfs/file.c:325 #2: ffff888026e800f8 (kn->active#55){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20e/0x500 fs/kernfs/file.c:326 #3: ffffffff8f571388 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216 #4: ffff88802e5560e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #4: ffff88802e5560e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #4: ffff88802e5560e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1293 #5: ffff888079b36250 (&devlink->lock_key#19){+.+.}-{3:3}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1672 #6: ffffffff8fcd3308 (rtnl_mutex){+.+.}-{3:3}, at: nsim_destroy+0x71/0x5c0 drivers/net/netdevsim/netdev.c:773 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-next-20240927-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 2941 Comm: kworker/u8:10 Not tainted 6.11.0-next-20240927-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events_unbound cfg80211_wiphy_work RIP: 0010:instrument_atomic_read include/linux/instrumented.h:68 [inline] RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] RIP: 0010:hlock_class kernel/locking/lockdep.c:228 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4851 [inline] RIP: 0010:__lock_acquire+0x886/0x2050 kernel/locking/lockdep.c:5152 Code: f8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 4d 01 00 00 41 8b 5d 00 81 e3 ff 1f 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 00 b8 2c 94 08 00 00 00 e8 a0 4c 8e 00 48 0f a3 1d d8 6a bc 12 73 1a 48 69 RSP: 0018:ffffc90009b8f710 EFLAGS: 00000006 RAX: 0000000000000003 RBX: 00000000000000c5 RCX: ffff88802e6ebc00 RDX: dffffc0000000000 RSI: ffff88802e6ec6e0 RDI: ffffffff942cb818 RBP: 00000000ffffffff R08: ffffffff942cb807 R09: 1ffffffff2859700 R10: dffffc0000000000 R11: fffffbfff2859701 R12: 0000000000000000 R13: ffff88802e6ec700 R14: 0000000000000000 R15: ffff88802e6ec700 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055713b7e2680 CR3: 000000000e734000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 rcu_lock_acquire include/linux/rcupdate.h:337 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] ieee80211_sta_active_ibss+0xe4/0x330 net/mac80211/ibss.c:642 ieee80211_sta_merge_ibss net/mac80211/ibss.c:1280 [inline] ieee80211_ibss_work+0x8fe/0x14c0 net/mac80211/ibss.c:1671 cfg80211_wiphy_work+0x2db/0x490 net/wireless/core.c:440 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 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