INFO: task syz-executor:9068 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:20992 pid:9068 tgid:9068 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: 0033:0x7f6279179ef9 RSP: 002b:00007fff1be209a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f62791e783c RCX: 00007f6279179ef9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000005 R08: 00007fff1be1e747 R09: 00007fff1be21c60 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff1be21c60 R13: 00007f62791e77dc R14: 00005555800324a8 R15: 00007fff1be22d20 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/u8:6/1042: #0: ffff88802a8d6948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff88802a8d6948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312 #1: ffffc90003bbfd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc90003bbfd00 ((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 3 locks held by kworker/u8:7/1076: #0: ffff888015489148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff888015489148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312 #1: ffffc90003d1fd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc90003d1fd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312 #2: ffffffff8fa78148 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276 5 locks held by kworker/u8:8/1115: #0: ffff8880162e3148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff8880162e3148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312 #1: ffffc90003dcfd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc90003dcfd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312 #2: ffffffff8fa6b590 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:594 #3: ffffffff8fa78148 (rtnl_mutex){+.+.}-{3:3}, at: default_device_exit_batch+0xe9/0xa90 net/core/dev.c:11883 #4: ffffffff8e73d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:296 [inline] #4: ffffffff8e73d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:958 1 lock held by dhcpcd/4890: #0: ffffffff8fa78148 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x2ce/0x1bc0 net/ipv4/devinet.c:1101 2 locks held by getty/4978: #0: ffff88802b0c30a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000312b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ac/0x1e00 drivers/tty/n_tty.c:2211 1 lock held by syz-executor/9068: #0: ffff88807a5b00e0 (&type->s_umount_key#87){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807a5b00e0 (&type->s_umount_key#87){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807a5b00e0 (&type->s_umount_key#87){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505 1 lock held by syz.3.589/10391: #0: ffff88807a5b00e0 (&type->s_umount_key#87){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807a5b00e0 (&type->s_umount_key#87){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.3.645/11060: #0: ffff88807a5b00e0 (&type->s_umount_key#87){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807a5b00e0 (&type->s_umount_key#87){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.1.708/11459: #0: ffff88807a5b00e0 (&type->s_umount_key#87){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807a5b00e0 (&type->s_umount_key#87){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.3.731/11622: #0: ffff88807a5b00e0 (&type->s_umount_key#87){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807a5b00e0 (&type->s_umount_key#87){++++}-{3:3}, at: super_lock+0x196/0x400 fs/super.c:120 4 locks held by syz.4.733/11657: 1 lock held by syz-executor/11778: #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/11802: #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/11881: #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 4 locks held by syz.2.766/11934: ============================================= NMI backtrace for cpu 0 CPU: 0 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 63 Comm: kworker/u8:4 Not tainted 6.11.0-rc5-syzkaller-00176-g20371ba12063 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: events_unbound cfg80211_wiphy_work RIP: 0010:unwind_next_frame+0x1e56/0x2a00 arch/x86/kernel/unwind_orc.c:665 Code: c0 d6 03 00 48 39 03 4c 8b 7c 24 08 0f 84 42 01 00 00 e8 4d 46 52 00 e9 06 fd ff ff e8 43 46 52 00 eb 0c e8 3c 46 52 00 eb 05 35 46 52 00 bf 01 00 00 00 e8 ab ba 21 00 65 8b 1d 0c 91 c2 7e RSP: 0018:ffffc900015e6868 EFLAGS: 00000206 RAX: 0000000000000000 RBX: ffffc900015e8000 RCX: ffff888017feda00 RDX: ffff888017feda00 RSI: ffffc900015e6fa0 RDI: ffffc900015e71a0 RBP: ffffc900015e6940 R08: ffffffff81414545 R09: ffffffff814140bf R10: 0000000000000003 R11: ffff888017feda00 R12: ffffc900015e71a0 R13: dffffc0000000000 R14: ffffc900015e0000 R15: ffffc900015e71a8 FS: 0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020025000 CR3: 0000000059922000 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+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 kvfree_call_rcu+0xfc/0x790 kernel/rcu/tree.c:3815 cfg80211_update_known_bss+0xb39/0x1500 net/wireless/scan.c:1891 __cfg80211_bss_update+0x153/0x2170 net/wireless/scan.c:1937 cfg80211_inform_single_bss_data+0xd51/0x2030 net/wireless/scan.c:2331 cfg80211_inform_bss_data+0x3dd/0x5a70 net/wireless/scan.c:3159 cfg80211_inform_bss_frame_data+0x3b8/0x720 net/wireless/scan.c:3254 ieee80211_bss_info_update+0x8a7/0xbc0 net/mac80211/scan.c:226 ieee80211_rx_bss_info net/mac80211/ibss.c:1100 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1579 [inline] ieee80211_ibss_rx_queued_mgmt+0x1962/0x2d70 net/mac80211/ibss.c:1606 ieee80211_iface_process_skb net/mac80211/iface.c:1588 [inline] ieee80211_iface_work+0x8a5/0xf20 net/mac80211/iface.c:1642 cfg80211_wiphy_work+0x2db/0x490 net/wireless/core.c:440 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd10 kernel/workqueue.c:3389 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