INFO: task syz-executor.1:5065 blocked for more than 143 seconds. Not tainted 6.6.0-rc3-syzkaller-00165-g3b517966c561 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:18792 pid:5065 ppid:1 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x196c/0x4af0 kernel/sched/core.c:6695 schedule+0xc3/0x180 kernel/sched/core.c:6771 schedule_timeout+0xb0/0x300 kernel/time/timer.c:2143 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x354/0x620 kernel/sched/completion.c:148 __flush_work+0x950/0xac0 kernel/workqueue.c:3407 nilfs_segctor_destroy fs/nilfs2/segment.c:2766 [inline] nilfs_detach_log_writer+0x47d/0xbe0 fs/nilfs2/segment.c:2850 nilfs_put_super+0x4d/0x160 fs/nilfs2/super.c:499 generic_shutdown_super+0x13a/0x2c0 fs/super.c:693 kill_block_super+0x41/0x70 fs/super.c:1646 deactivate_locked_super+0xa4/0x110 fs/super.c:481 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1254 task_work_run+0x24a/0x300 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f274c47de17 RSP: 002b:00007ffc3131ee68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f274c47de17 RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffc3131ef20 RBP: 00007ffc3131ef20 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc3131ffe0 R13: 00007f274c4c73b9 R14: 00000000002b08ff R15: 000000000000001e Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8d32c420 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:303 [inline] #0: ffffffff8d32c420 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:749 [inline] #0: ffffffff8d32c420 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6613 1 lock held by klogd/4472: 2 locks held by getty/4788: #0: ffff8880265b90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b1/0x1dc0 drivers/tty/n_tty.c:2206 1 lock held by syz-executor.1/5065: #0: ffff88807f0d80e0 (&type->s_umount_key#92){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807f0d80e0 (&type->s_umount_key#92){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807f0d80e0 (&type->s_umount_key#92){+.+.}-{3:3}, at: deactivate_super+0xad/0xf0 fs/super.c:513 2 locks held by kworker/u4:0/13678: 3 locks held by kworker/0:0/922: #0: ffff888012870d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline] #0: ffff888012870d38 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1400 kernel/workqueue.c:2703 #1: ffffc900145c7d20 ((work_completion)(&sci->sc_iput_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline] #1: ffffc900145c7d20 ((work_completion)(&sci->sc_iput_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1400 kernel/workqueue.c:2703 #2: ffff88807f0d8600 (sb_internal#5){.+.+}-{0:0}, at: nilfs_evict_inode+0x167/0x500 fs/nilfs2/inode.c:929 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 30 Comm: khungtaskd Not tainted 6.6.0-rc3-syzkaller-00165-g3b517966c561 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x310 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xfa9/0xff0 kernel/hung_task.c:379 kthread+0x2d3/0x370 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 13678 Comm: kworker/u4:0 Not tainted 6.6.0-rc3-syzkaller-00165-g3b517966c561 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Workqueue: bat_events batadv_nc_worker RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:80 [inline] RIP: 0010:rcu_is_watching+0x0/0xb0 kernel/rcu/tree.c:698 Code: e9 6c ff ff ff 48 c7 c7 a0 30 33 8d 4c 89 f6 e8 76 3c 01 03 e9 2b ff ff ff e8 4c e6 56 09 66 2e 0f 1f 84 00 00 00 00 00 66 90 0f 1e fa 41 57 41 56 53 65 ff 05 a8 42 8d 7e e8 1b 00 57 09 89 RSP: 0018:ffffc90009cbfb90 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff88807e869400 RCX: ffff88801cedbb80 RDX: ffff88801cedbb80 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff888029da9270 R08: ffffffff8a9cf351 R09: 1ffffffff20df670 R10: dffffc0000000000 R11: fffffbfff20df671 R12: ffff88802f0fcc80 R13: 000000000000024e R14: 0000000000000001 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055df15c11680 CR3: 000000000d130000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_lock include/linux/rcupdate.h:750 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0x10b/0x610 net/batman-adv/network-coding.c:719 process_one_work kernel/workqueue.c:2630 [inline] process_scheduled_works+0x90f/0x1400 kernel/workqueue.c:2703 worker_thread+0xa5f/0xff0 kernel/workqueue.c:2784 kthread+0x2d3/0x370 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304