INFO: task syz.4.814:9574 blocked for more than 143 seconds. Not tainted 6.13.0-rc7-syzkaller-00039-gc3812b15000c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.814 state:D stack:23792 pid:9574 tgid:9573 ppid:8227 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905 rwsem_down_read_slowpath kernel/locking/rwsem.c:1084 [inline] __down_read_common kernel/locking/rwsem.c:1248 [inline] __down_read kernel/locking/rwsem.c:1261 [inline] down_read+0x705/0xa40 kernel/locking/rwsem.c:1526 __super_lock fs/super.c:58 [inline] super_lock+0x27c/0x400 fs/super.c:120 super_lock_shared fs/super.c:139 [inline] iterate_supers+0x8c/0x190 fs/super.c:931 ksys_sync+0xbd/0x1c0 fs/sync.c:102 __do_sys_sync+0xe/0x20 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2ee2d85d29 RSP: 002b:00007f2ee3af7038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f2ee2f75fa0 RCX: 00007f2ee2d85d29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f2ee2f75fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2ee2f75fa0 R15: 00007ffdefebf4d8 INFO: task syz.4.814:9578 blocked for more than 144 seconds. Not tainted 6.13.0-rc7-syzkaller-00039-gc3812b15000c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.814 state:D stack:25784 pid:9578 tgid:9573 ppid:8227 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905 rwsem_down_read_slowpath kernel/locking/rwsem.c:1084 [inline] __down_read_common kernel/locking/rwsem.c:1248 [inline] __down_read kernel/locking/rwsem.c:1261 [inline] down_read+0x705/0xa40 kernel/locking/rwsem.c:1526 __super_lock fs/super.c:58 [inline] super_lock+0x27c/0x400 fs/super.c:120 super_lock_shared fs/super.c:139 [inline] iterate_supers+0x8c/0x190 fs/super.c:931 ksys_sync+0xbd/0x1c0 fs/sync.c:102 __do_sys_sync+0xe/0x20 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2ee2d85d29 RSP: 002b:00007f2ee3ad6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f2ee2f76080 RCX: 00007f2ee2d85d29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f2ee2f76080 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2ee2f76080 R15: 00007ffdefebf4d8 Showing all locks held in the system: 3 locks held by kworker/u8:0/11: #0: ffff888031431148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888031431148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3317 #1: ffffc90000107d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc90000107d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3317 #2: ffffffff8fcb2f48 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4215 1 lock held by khungtaskd/30: #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744 2 locks held by kworker/u8:4/67: 3 locks held by kworker/u8:5/82: #0: ffff88801ac81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3317 #1: ffffc9000156fd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc9000156fd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3317 #2: ffff8880b863e8d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:606 1 lock held by syz-executor/7189: #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: deactivate_super+0xb5/0xf0 fs/super.c:505 1 lock held by syz.4.814/9574: #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.4.814/9578: #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120 2 locks held by getty/10173: #0: ffff88814d4070a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000c51d2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 1 lock held by syz.8.966/10299: #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.8.966/10306: #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.8.966/10307: #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.8.966/10317: #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.8.966/10321: #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.8.966/10323: #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.8.966/10329: #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.8.966/10339: #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880270140e0 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120 2 locks held by kworker/u8:15/10568: #0: ffff888147a80948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff888147a80948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3317 #1: ffffc9001b697d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc9001b697d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3317 1 lock held by syz-executor/10788: #0: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline] #0: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976 2 locks held by syz.5.1142/11171: 1 lock held by syz.2.1147/11191: 2 locks held by syz.6.1150/11189: #0: ffff88807dc3c0e0 (&type->s_umount_key#91/1){+.+.}-{4:4}, at: alloc_super+0x221/0x9d0 fs/super.c:344 #1: ffffffff8e93cec0 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:4565 1 lock held by sed/11203: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc7-syzkaller-00039-gc3812b15000c #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:234 [inline] watchdog+0xff6/0x1040 kernel/hung_task.c:397 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/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 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111