INFO: task syz-executor.1:21435 blocked for more than 143 seconds. Not tainted 6.2.0-rc3-next-20230109-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28256 pid:21435 ppid:5106 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5252 [inline] __schedule+0x25d0/0x5a70 kernel/sched/core.c:6570 schedule+0xde/0x1b0 kernel/sched/core.c:6646 rwsem_down_read_slowpath+0x5a7/0xb20 kernel/locking/rwsem.c:1095 __down_read_common kernel/locking/rwsem.c:1260 [inline] __down_read kernel/locking/rwsem.c:1269 [inline] down_read+0xe6/0x450 kernel/locking/rwsem.c:1511 mmap_read_lock include/linux/mmap_lock.h:117 [inline] do_user_addr_fault+0xa51/0x1210 arch/x86/mm/fault.c:1379 handle_page_fault arch/x86/mm/fault.c:1519 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1575 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7f72992276c6 RSP: 002b:00007ffe12016ac8 EFLAGS: 00010287 RAX: 0000001b32722000 RBX: 00007f72993ac018 RCX: 0000001b32720000 RDX: 0000001b32722004 RSI: 0000001b32721664 RDI: 00000000fed494c0 RBP: 00000000fed494c0 R08: 0000001b32b20000 R09: 00000000fed494c4 R10: 00007ffe12172090 R11: 0000000000026670 R12: 00007f72993a0000 R13: 0000000000000001 R14: 0000000000005f75 R15: ffffffff84793439 Showing all threads with locks held in the system: task:rcu_tasks_kthre state:I stack:29056 pid:12 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5252 [inline] __schedule+0x25d0/0x5a70 kernel/sched/core.c:6570 schedule+0xde/0x1b0 kernel/sched/core.c:6646 rcu_tasks_one_gp+0x484/0xcd0 kernel/rcu/tasks.h:517 rcu_tasks_kthread+0x77/0xa0 kernel/rcu/tasks.h:555 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8c7929f0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xcd0 kernel/rcu/tasks.h:510 task:rcu_tasks_trace state:I stack:29224 pid:13 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5252 [inline] __schedule+0x25d0/0x5a70 kernel/sched/core.c:6570 schedule+0xde/0x1b0 kernel/sched/core.c:6646 rcu_tasks_one_gp+0x484/0xcd0 kernel/rcu/tasks.h:517 rcu_tasks_kthread+0x77/0xa0 kernel/rcu/tasks.h:555 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 1 lock held by rcu_tasks_trace/13: #0: ffffffff8c7926f0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xcd0 kernel/rcu/tasks.h:510 task:getty state:S stack:23336 pid:4756 ppid:1 flags:0x00000000 Call Trace: context_switch kernel/sched/core.c:5252 [inline] __schedule+0x25d0/0x5a70 kernel/sched/core.c:6570 schedule+0xde/0x1b0 kernel/sched/core.c:6646 schedule_timeout+0x1e1/0x2a0 kernel/time/timer.c:2143 wait_woken+0x197/0x200 kernel/sched/wait.c:463 n_tty_read+0x1055/0x13e0 drivers/tty/n_tty.c:2243 iterate_tty_read drivers/tty/tty_io.c:852 [inline] tty_read+0x30e/0x5a0 drivers/tty/tty_io.c:927 call_read_iter include/linux/fs.h:2185 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x681/0x930 fs/read_write.c:470 ksys_read+0x12b/0x250 fs/read_write.c:613 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: 0033:0x7f79fc46d8fe RSP: 002b:00007fffc3444838 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000555d5db3b910 RCX: 00007f79fc46d8fe RDX: 0000000000000001 RSI: 00007fffc3444850 RDI: 0000000000000000 RBP: 0000555d5db3b970 R08: 0000000000000007 R09: 0000555d5db3ccd0 R10: 0000000000000063 R11: 0000000000000246 R12: 0000555d5db3b9ac R13: 00007fffc3444850 R14: 0000000000000000 R15: 0000555d5db3b9ac 2 locks held by getty/4756: #0: ffff88814b4a0098 ( &tty->ldisc_sem ){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc900015902f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2177 task:kworker/0:4 state:D stack:25752 pid:5172 ppid:2 flags:0x00004000 Workqueue: events fqdir_free_fn Call Trace: context_switch kernel/sched/core.c:5252 [inline] __schedule+0x25d0/0x5a70 kernel/sched/core.c:6570 schedule+0xde/0x1b0 kernel/sched/core.c:6646 schedule_timeout+0x1e1/0x2a0 kernel/time/timer.c:2143 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x1ce/0x5c0 kernel/sched/completion.c:106 rcu_barrier+0x37f/0x6d0 kernel/rcu/tree.c:4011 fqdir_free_fn+0x32/0x160 net/ipv4/inet_fragment.c:164 process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293 process_scheduled_works kernel/workqueue.c:2356 [inline] worker_thread+0x858/0x1090 kernel/workqueue.c:2442 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 3 locks held by kworker/0:4/5172: #0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x86d/0x1750 kernel/workqueue.c:2264 #1: ffffc90004497da8 (fqdir_free_work){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1750 kernel/workqueue.c:2268 #2: ffffffff8c79e580 (rcu_state.barrier_mutex ){+.+.}-{3:3} , at: rcu_barrier+0x48/0x6d0 kernel/rcu/tree.c:3943 task:kworker/1:10 state:D stack:26064 pid:8843 ppid:2 flags:0x00004000 Workqueue: rcu_gp wait_rcu_exp_gp Call Trace: context_switch kernel/sched/core.c:5252 [inline] __schedule+0x25d0/0x5a70 kernel/sched/core.c:6570 schedule+0xde/0x1b0 kernel/sched/core.c:6646 schedule_timeout+0x14e/0x2a0 kernel/time/timer.c:2167 synchronize_rcu_expedited_wait_once kernel/rcu/tree_exp.h:572 [inline] synchronize_rcu_expedited_wait kernel/rcu/tree_exp.h:624 [inline] rcu_exp_wait_wake+0x28f/0x11c0 kernel/rcu/tree_exp.h:693 process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293 worker_thread+0x669/0x1090 kernel/workqueue.c:2440 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 2 locks held by kworker/1:10/8843: #0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0} , at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] , at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] , at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] , at: set_work_data kernel/workqueue.c:636 [inline] , at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] , at: process_one_work+0x86d/0x1750 kernel/workqueue.c:2264 #1: ffffc9000bef7da8 ( (work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1750 kernel/workqueue.c:2268 task:syz-executor.1 state:D stack:28256 pid:21435 ppid:5106 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5252 [inline] __schedule+0x25d0/0x5a70 kernel/sched/core.c:6570 schedule+0xde/0x1b0 kernel/sched/core.c:6646 rwsem_down_read_slowpath+0x5a7/0xb20 kernel/locking/rwsem.c:1095 __down_read_common kernel/locking/rwsem.c:1260 [inline] __down_read kernel/locking/rwsem.c:1269 [inline] down_read+0xe6/0x450 kernel/locking/rwsem.c:1511 mmap_read_lock include/linux/mmap_lock.h:117 [inline] do_user_addr_fault+0xa51/0x1210 arch/x86/mm/fault.c:1379 handle_page_fault arch/x86/mm/fault.c:1519 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1575 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7f72992276c6 RSP: 002b:00007ffe12016ac8 EFLAGS: 00010287 RAX: 0000001b32722000 RBX: 00007f72993ac018 RCX: 0000001b32720000 RDX: 0000001b32722004 RSI: 0000001b32721664 RDI: 00000000fed494c0 RBP: 00000000fed494c0 R08: 0000001b32b20000 R09: 00000000fed494c4 R10: 00007ffe12172090 R11: 0000000000026670 R12: 00007f72993a0000 R13: 0000000000000001 R14: 0000000000005f75 R15: ffffffff84793439 1 lock held by syz-executor.1/21435: #0: ffff888075978198 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline] #0: ffff888075978198 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0xa51/0x1210 arch/x86/mm/fault.c:1379 task:syz-executor.1 state:R running task stack:26944 pid:21440 ppid:5106 flags:0x00004006 Call Trace: 5 locks held by syz-executor.1/21440: task:kworker/u4:18 state:D stack:25240 pid:22318 ppid:2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:5252 [inline] __schedule+0x25d0/0x5a70 kernel/sched/core.c:6570 schedule+0xde/0x1b0 kernel/sched/core.c:6646 synchronize_rcu_expedited+0x5e2/0x770 kernel/rcu/tree_exp.h:1005 synchronize_rcu+0x302/0x3b0 kernel/rcu/tree.c:3481 synchronize_net+0x4e/0x60 net/core/dev.c:10749 nf_conntrack_cleanup_net_list+0x9e/0x5d0 net/netfilter/nf_conntrack_core.c:2555 ops_exit_list+0x125/0x170 net/core/net_namespace.c:174 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606 process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293 worker_thread+0x669/0x1090 kernel/workqueue.c:2440 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 4 locks held by kworker/u4:18/22318: #0: ffff8880125df938 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880125df938 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff8880125df938 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff8880125df938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff8880125df938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff8880125df938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x86d/0x1750 kernel/workqueue.c:2264 #1: ffffc900159c7da8 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1750 kernel/workqueue.c:2268 #2: ffffffff8e0b2490 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9f/0xb10 net/core/net_namespace.c:568 #3: ffffffff8c79e6b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:293 [inline] #3: ffffffff8c79e6b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x658/0x770 kernel/rcu/tree_exp.h:990 task:syz-executor.4 state:D stack:26120 pid:22847 ppid:5123 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5252 [inline] __schedule+0x25d0/0x5a70 kernel/sched/core.c:6570 schedule+0xde/0x1b0 kernel/sched/core.c:6646 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6705 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747 rcu_barrier+0x48/0x6d0 kernel/rcu/tree.c:3943 setup_net+0xab5/0xe60 net/core/net_namespace.c:362 copy_net_ns+0x320/0x6b0 net/core/net_namespace.c:483 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x410/0x500 kernel/nsproxy.c:179 copy_process+0x314a/0x7740 kernel/fork.c:2272 kernel_clone+0xeb/0x9a0 kernel/fork.c:2684 __do_sys_clone+0xba/0x100 kernel/fork.c:2825 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: 0033:0x7f8fc488c0c9 RSP: 002b:00007f8fc55bc118 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f8fc49abf80 RCX: 00007f8fc488c0c9 RDX: 0000000020000340 RSI: 0000000020000330 RDI: 0000000050900000 RBP: 00007f8fc48e7ae9 R08: 00000000200003c0 R09: 00000000200003c0 R10: 0000000020000380 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffdb10574af R14: 00007f8fc55bc300 R15: 0000000000022000 2 locks held by syz-executor.4/22847: #0: ffffffff8e0b2490 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2fd/0x6b0 net/core/net_namespace.c:479 #1: ffffffff8c79e580 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x6d0 kernel/rcu/tree.c:3943 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.2.0-rc3-next-20230109-syzkaller #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+0xd1/0x138 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x24/0x18a lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x32f/0x3c0 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+0xcae/0x1050 kernel/hung_task.c:377 kthread+0x2e8/0x3a0 kernel/kthread.c:376 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: 5211 Comm: kworker/0:6 Not tainted 6.2.0-rc3-next-20230109-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: events_power_efficient wg_ratelimiter_gc_entries RIP: 0010:arch_irqs_disabled_flags arch/x86/include/asm/irqflags.h:125 [inline] RIP: 0010:check_preemption_disabled+0x4d/0x170 lib/smp_processor_id.c:19 Code: e3 ff ff ff 7f 31 ff 89 de 0f 1f 44 00 00 85 db 74 11 0f 1f 44 00 00 44 89 e0 5b 5d 41 5c 41 5d 41 5e c3 0f 1f 44 00 00 9c 5b <81> e3 00 02 00 00 31 ff 48 89 de 0f 1f 44 00 00 48 85 db 74 d3 0f RSP: 0018:ffffc90004507c30 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000046 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffffff8aa6ca20 R08: 0000000000000000 R09: ffffffff8d5e01a3 R10: fffffbfff1abc034 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff8a4c54e0 R14: 00000000ffffffff R15: ffff88801863c4e0 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000560ce770c018 CR3: 000000000c48e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline] lock_is_held_type+0xdb/0x140 kernel/locking/lockdep.c:5713 lock_is_held include/linux/lockdep.h:283 [inline] __might_resched+0x1f9/0x2e0 kernel/sched/core.c:9962 wg_ratelimiter_gc_entries+0x2f5/0x430 drivers/net/wireguard/ratelimiter.c:78 process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293 worker_thread+0x669/0x1090 kernel/workqueue.c:2440 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308