INFO: task syz-executor:5965 blocked for more than 143 seconds. Not tainted 6.11.0-rc5-syzkaller-00176-g20371ba12063 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:20464 pid:5965 tgid:5965 ppid:1 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 io_schedule+0x8d/0x110 kernel/sched/core.c:7401 folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1307 folio_wait_writeback+0xe7/0x1e0 mm/page-writeback.c:3189 __filemap_fdatawait_range+0x181/0x410 mm/filemap.c:532 filemap_fdatawait_range+0x25/0x40 mm/filemap.c:559 filemap_fdatawait include/linux/pagemap.h:48 [inline] __writeback_single_inode+0x1f0/0x10b0 fs/fs-writeback.c:1661 writeback_single_inode+0x21b/0x7a0 fs/fs-writeback.c:1772 write_inode_now+0x1d1/0x260 fs/fs-writeback.c:2822 iput_final fs/inode.c:1825 [inline] iput+0x5d7/0x930 fs/inode.c:1864 nilfs_dispose_list+0x51d/0x5c0 fs/nilfs2/segment.c:820 nilfs_segctor_destroy fs/nilfs2/segment.c:2797 [inline] nilfs_detach_log_writer+0x7e3/0xbe0 fs/nilfs2/segment.c:2869 nilfs_put_super+0x4d/0x160 fs/nilfs2/super.c:498 generic_shutdown_super+0x136/0x2d0 fs/super.c:642 kill_block_super+0x44/0x90 fs/super.c:1696 deactivate_locked_super+0xc4/0x130 fs/super.c:473 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373 task_work_run+0x24f/0x310 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2f/0x27f0 kernel/exit.c:882 do_group_exit+0x207/0x2c0 kernel/exit.c:1031 __do_sys_exit_group kernel/exit.c:1042 [inline] __se_sys_exit_group kernel/exit.c:1040 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 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: 0033:0x7f604df79ef9 RSP: 002b:00007fff39410168 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f604dfe783c RCX: 00007f604df79ef9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000005 R08: 00007fff3940df07 R09: 00007fff39411420 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff39411420 R13: 00007f604dfe77dc R14: 000055555576d4a8 R15: 00007fff394124e0 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e738320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #0: ffffffff8e738320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff8e738320 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6626 3 locks held by kworker/u8:6/1052: #0: ffff88802a36f148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff88802a36f148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312 #1: ffffc9000436fd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc9000436fd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312 #2: ffffffff8fa78148 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4194 2 locks held by getty/4974: #0: ffff88802abc70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000311b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ac/0x1e00 drivers/tty/n_tty.c:2211 3 locks held by kworker/0:3/5220: #0: ffff888015480948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff888015480948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312 #1: ffffc900036cfd00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc900036cfd00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312 #2: ffff88807082d240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x2d1/0x4130 drivers/net/netdevsim/fib.c:1489 3 locks held by kworker/0:5/5274: #0: ffff888015480948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff888015480948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312 #1: ffffc900039a7d00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc900039a7d00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312 #2: ffff88802a835240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x2d1/0x4130 drivers/net/netdevsim/fib.c:1489 1 lock held by syz-executor/5965: #0: ffff88802369e0e0 (&type->s_umount_key#67){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88802369e0e0 (&type->s_umount_key#67){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88802369e0e0 (&type->s_umount_key#67){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505 1 lock held by syz.0.210/7252: #0: ffff88802369e0e0 (&type->s_umount_key#67){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802369e0e0 (&type->s_umount_key#67){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.0.251/7730: #0: ffff88802369e0e0 (&type->s_umount_key#67){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802369e0e0 (&type->s_umount_key#67){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.0.275/8190: #0: ffff88802369e0e0 (&type->s_umount_key#67){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802369e0e0 (&type->s_umount_key#67){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.1.293/8193: #0: ffff88802369e0e0 (&type->s_umount_key#67){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802369e0e0 (&type->s_umount_key#67){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 6 locks held by syz-executor/8305: 1 lock held by syz-executor/8306: #0: ffffffff8fa78148 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fa78148 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6644 1 lock held by syz-executor/8422: #0: ffffffff8fa78148 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fa78148 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6644 1 lock held by syz-executor/8431: #0: ffffffff8fa78148 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fa78148 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6644 2 locks held by syz.4.300/8623: 3 locks held by dhcpcd-run-hook/8664: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc5-syzkaller-00176-g20371ba12063 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 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: 8305 Comm: syz-executor Not tainted 6.11.0-rc5-syzkaller-00176-g20371ba12063 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:unwind_done arch/x86/include/asm/unwind.h:50 [inline] RIP: 0010:unwind_next_frame+0xa9/0x2a00 arch/x86/kernel/unwind_orc.c:475 Code: e8 03 48 89 44 24 08 42 0f b6 04 28 84 c0 0f 85 6a 20 00 00 44 8b 75 00 31 ff 44 89 f6 e8 2f 68 52 00 44 89 b4 24 8c 00 00 00 <45> 85 f6 0f 84 8a 00 00 00 48 89 5c 24 50 bf 01 00 00 00 e8 af d6 RSP: 0018:ffffc90000006868 EFLAGS: 00000246 RAX: 0000000000000100 RBX: ffffc90000006978 RCX: ffff88802af8bc00 RDX: ffff88802af8bc00 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000006940 R08: ffffffff814127f1 R09: ffffc90000006a30 R10: 0000000000000003 R11: ffffffff817f2eb0 R12: ffff88802af8bc00 R13: dffffc0000000000 R14: 0000000000000001 R15: ffffffff8bc014ca FS: 000055558aa8b500(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055e46995c000 CR3: 0000000070ab0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3988 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4044 fill_pool lib/debugobjects.c:169 [inline] debug_objects_fill_pool+0x63f/0x9b0 lib/debugobjects.c:616 debug_object_activate+0x135/0x510 lib/debugobjects.c:705 debug_rcu_head_queue kernel/rcu/rcu.h:227 [inline] __call_rcu_common kernel/rcu/tree.c:3091 [inline] call_rcu+0x97/0xa70 kernel/rcu/tree.c:3210 refdst_drop include/net/dst.h:263 [inline] skb_dst_drop include/net/dst.h:275 [inline] skb_release_head_state+0x73/0x250 net/core/skbuff.c:1172 skb_release_all net/core/skbuff.c:1186 [inline] __kfree_skb net/core/skbuff.c:1202 [inline] sk_skb_reason_drop+0x170/0x3d0 net/core/skbuff.c:1240 kfree_skb_reason include/linux/skbuff.h:1260 [inline] kfree_skb include/linux/skbuff.h:1269 [inline] ip6_tnl_start_xmit+0xa7a/0x1430 net/ipv6/ip6_tunnel.c:1455 __netdev_start_xmit include/linux/netdevice.h:4913 [inline] netdev_start_xmit include/linux/netdevice.h:4922 [inline] xmit_one net/core/dev.c:3580 [inline] dev_hard_start_xmit+0x27a/0x7e0 net/core/dev.c:3596 __dev_queue_xmit+0x1b63/0x3e90 net/core/dev.c:4423 neigh_output include/net/neighbour.h:542 [inline] ip6_finish_output2+0x1001/0x1730 net/ipv6/ip6_output.c:141 ip6_finish_output+0x41e/0x810 net/ipv6/ip6_output.c:226 NF_HOOK include/linux/netfilter.h:314 [inline] ndisc_send_skb+0xab2/0x1380 net/ipv6/ndisc.c:511 addrconf_rs_timer+0x371/0x670 net/ipv6/addrconf.c:4040 call_timer_fn+0x18e/0x650 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1843 [inline] __run_timers kernel/time/timer.c:2417 [inline] __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2428 run_timer_base kernel/time/timer.c:2437 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2447 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:console_flush_all+0xaad/0xfd0 kernel/printk/printk.c:3055 Code: ff ff e8 26 c6 1f 00 90 0f 0b 90 e9 d8 f8 ff ff e8 18 c6 1f 00 e8 f3 b4 3c 0a 4d 85 f6 74 b6 e8 09 c6 1f 00 fb 48 8b 44 24 70 <42> 0f b6 04 38 84 c0 48 8b 7c 24 30 0f 85 22 02 00 00 0f b6 1f 31 RSP: 0018:ffffc900039f68c0 EFLAGS: 00000293 RAX: 1ffff9200073ed64 RBX: 0000000000000000 RCX: ffff88802af8bc00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900039f6a70 R08: ffffffff8173c574 R09: 1ffffffff26a0b08 R10: dffffc0000000000 R11: fffffbfff26a0b09 R12: ffffffff8ef25378 R13: ffffffff8ef25320 R14: 0000000000000200 R15: dffffc0000000000 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3118 vprintk_emit+0x5dc/0x7c0 kernel/printk/printk.c:2348 _printk+0xd5/0x120 kernel/printk/printk.c:2373 batadv_check_known_mac_addr+0x2bd/0x410 net/batman-adv/hard-interface.c:528 batadv_hard_if_event+0x3a5/0x1620 net/batman-adv/hard-interface.c:998 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2032 [inline] call_netdevice_notifiers net/core/dev.c:2046 [inline] dev_set_mac_address+0x3d9/0x510 net/core/dev.c:9101 dev_set_mac_address_user+0x31/0x50 net/core/dev.c:9115 do_setlink+0x8b6/0x41f0 net/core/rtnetlink.c:2855 __rtnl_newlink net/core/rtnetlink.c:3696 [inline] rtnl_newlink+0x180d/0x20a0 net/core/rtnetlink.c:3743 rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6647 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2212 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: 0033:0x7fa24737bd8c Code: 2a 5a 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5a 02 00 48 8b RSP: 002b:00007ffcdccee6f0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fa248044620 RCX: 00007fa24737bd8c RDX: 000000000000002c RSI: 00007fa248044670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffcdccee744 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007fa248044670 R15: 0000000000000000