INFO: task syz-executor.0:14895 blocked for more than 146 seconds. Not tainted 6.3.0-rc2-next-20230316-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27680 pid:14895 ppid:10280 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5305 [inline] __schedule+0x1d23/0x5650 kernel/sched/core.c:6623 schedule+0xde/0x1a0 kernel/sched/core.c:6699 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6758 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa3b/0x1350 kernel/locking/mutex.c:747 eventpoll_release_file+0xe2/0x1d0 fs/eventpoll.c:962 eventpoll_release include/linux/eventpoll.h:53 [inline] __fput+0x7da/0xa90 fs/file_table.c:312 task_work_run+0x16f/0x270 kernel/task_work.c:179 get_signal+0x1c7/0x25b0 kernel/signal.c:2635 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f6c45a8c0f9 RSP: 002b:00007f6c445fe168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: 000000000000000b RBX: 00007f6c45babf80 RCX: 00007f6c45a8c0f9 RDX: 0000000000000318 RSI: 00000000200bd000 RDI: 0000000000000004 RBP: 00007f6c45ae7b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe84fcfbcf R14: 00007f6c445fe300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/13: #0: ffffffff8c795830 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:516 1 lock held by rcu_tasks_trace/14: #0: ffffffff8c795530 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:516 1 lock held by khungtaskd/28: #0: ffffffff8c796400 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x390 kernel/locking/lockdep.c:6545 1 lock held by udevd/4445: 2 locks held by getty/4760: #0: ffff88802c342098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900015802f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2177 3 locks held by syz-executor.3/5097: #0: ffff88804f28ca38 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: iterate_dir+0xd1/0x6f0 fs/readdir.c:55 #1: ffff88814bc10460 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2184 [inline] #1: ffff88814bc10460 (sb_writers#4){.+.+}-{0:0}, at: iterate_dir+0x45d/0x6f0 fs/readdir.c:70 #2: ffff88814bc14990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14e0 fs/jbd2/transaction.c:461 1 lock held by syz-executor.1/5102: #0: ffffffff8c7a1878 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline] #0: ffffffff8c7a1878 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3e8/0x770 kernel/rcu/tree_exp.h:992 3 locks held by kworker/u4:9/5899: 3 locks held by kworker/u4:18/6095: #0: ffff888016617138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888016617138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888016617138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff888016617138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:639 [inline] #0: ffff888016617138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:666 [inline] #0: ffff888016617138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x87a/0x15c0 kernel/workqueue.c:2361 #1: ffffc900151dfda8 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8ae/0x15c0 kernel/workqueue.c:2365 #2: ffffffff8e0efb90 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9f/0xb10 net/core/net_namespace.c:576 2 locks held by kworker/0:29/11329: #0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:639 [inline] #0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:666 [inline] #0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x87a/0x15c0 kernel/workqueue.c:2361 #1: ffffc9000a18fda8 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x15c0 kernel/workqueue.c:2365 1 lock held by syz-executor.0/14895: #0: ffff88802a829068 (&ep->mtx){+.+.}-{3:3}, at: eventpoll_release_file+0xe2/0x1d0 fs/eventpoll.c:962 1 lock held by syz-executor.0/14899: 1 lock held by syz-executor.0/15061: #0: ffffffff8c7a1878 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline] #0: ffffffff8c7a1878 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3e8/0x770 kernel/rcu/tree_exp.h:992 1 lock held by syz-executor.5/16058: #0: ffff888045bde0e0 (&type->s_umount_key#82/1){+.+.}-{3:3}, at: alloc_super+0x22e/0xb60 fs/super.c:228 1 lock held by syz-executor.4/16066: #0: ffff88801c9780e0 (&type->s_umount_key#82/1){+.+.}-{3:3}, at: alloc_super+0x22e/0xb60 fs/super.c:228 1 lock held by syz-executor.2/16070: #0: ffff88807c6c40e0 (&type->s_umount_key#82/1){+.+.}-{3:3}, at: alloc_super+0x22e/0xb60 fs/super.c:228 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.3.0-rc2-next-20230316-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 nmi_cpu_backtrace+0x29c/0x350 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x2a4/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xe16/0x1090 kernel/hung_task.c:379 kthread+0x33e/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 16079 Comm: syz-executor.2 Not tainted 6.3.0-rc2-next-20230316-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 RIP: 0010:vm_area_alloc_pages mm/vmalloc.c:2917 [inline] RIP: 0010:__vmalloc_area_node mm/vmalloc.c:3029 [inline] RIP: 0010:__vmalloc_node_range+0x4e0/0x1380 mm/vmalloc.c:3199 Code: 89 e6 44 89 f7 e8 90 11 ba ff 45 39 e6 0f 86 13 01 00 00 e8 e2 15 ba ff 44 89 f3 b8 64 00 00 00 8b b4 24 a0 01 00 00 44 29 e3 ff ff ff ff 83 fb 64 0f 47 d8 44 89 e0 49 8d 6c c5 00 e8 d8 11 RSP: 0018:ffffc90006c2f9e0 EFLAGS: 00000202 RAX: 0000000000000064 RBX: 0000000000000008 RCX: 0000000000000000 RDX: ffff88805cdfd7c0 RSI: 00000000ffffffff RDI: 0000000000000004 RBP: 0000000000000040 R08: 0000000000000004 R09: 0000000000000008 R10: 0000000000000000 R11: 0000000000094001 R12: 0000000000000000 R13: ffff888061b3bf80 R14: 0000000000000008 R15: dffffc0000000000 FS: 0000555557330400(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555557331808 CR3: 000000002240d000 CR4: 00000000003506f0 DR0: 00000000ffff070c DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: alloc_thread_stack_node kernel/fork.c:311 [inline] dup_task_struct kernel/fork.c:1118 [inline] copy_process+0x133f/0x76b0 kernel/fork.c:2243 kernel_clone+0xeb/0x890 kernel/fork.c:2836 __do_sys_clone+0xba/0x100 kernel/fork.c:2979 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fbb5fe8d521 Code: 48 85 ff 74 3d 48 85 f6 74 38 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 7c 13 74 01 c3 31 ed 58 5f ff d0 48 89 c7 b8 3c 00 00 00 RSP: 002b:00007ffdba6cdc78 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fbb60ca3700 RCX: 00007fbb5fe8d521 RDX: 00007fbb60ca39d0 RSI: 00007fbb60ca32f0 RDI: 00000000003d0f00 RBP: 00007ffdba6cdec0 R08: 00007fbb60ca3700 R09: 00007fbb60ca3700 R10: 00007fbb60ca39d0 R11: 0000000000000206 R12: 00007ffdba6cdd2e R13: 00007ffdba6cdd2f R14: 00007fbb60ca3300 R15: 0000000000022000