Hello, syzbot found the following issue on: HEAD commit: 6613476e225e Linux 6.8-rc1 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=118c81d7e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=f9804db253bdfc61 dashboard link: https://syzkaller.appspot.com/bug?extid=826187129aa8a9eb81be compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11f0127de80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/eb2c4c0bff80/disk-6613476e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8243d7a3c960/vmlinux-6613476e.xz kernel image: https://storage.googleapis.com/syzbot-assets/c964733b4579/bzImage-6613476e.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/e864c702c7ef/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+826187129aa8a9eb81be@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz-executor.0:5122 blocked for more than 143 seconds. Not tainted 6.8.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:23936 pid:5122 tgid:5122 ppid:1 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5400 [inline] __schedule+0xf12/0x5c00 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0xe9/0x270 kernel/sched/core.c:6817 io_schedule+0xbe/0x130 kernel/sched/core.c:9023 folio_wait_bit_common+0x3dc/0x9c0 mm/filemap.c:1274 __folio_lock mm/filemap.c:1612 [inline] folio_lock include/linux/pagemap.h:1048 [inline] folio_lock include/linux/pagemap.h:1044 [inline] __filemap_get_folio+0x633/0xaa0 mm/filemap.c:1865 truncate_inode_pages_range+0x3a0/0xf00 mm/truncate.c:367 ntfs_evict_big_inode+0x32/0x530 fs/ntfs/inode.c:2251 evict+0x2ed/0x6b0 fs/inode.c:665 dispose_list+0x117/0x1e0 fs/inode.c:698 evict_inodes+0x34f/0x450 fs/inode.c:748 generic_shutdown_super+0xb5/0x3d0 fs/super.c:631 kill_block_super+0x3b/0x90 fs/super.c:1680 deactivate_locked_super+0xbc/0x1a0 fs/super.c:477 deactivate_super+0xde/0x100 fs/super.c:510 cleanup_mnt+0x222/0x450 fs/namespace.c:1267 task_work_run+0x14d/0x240 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:108 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0x281/0x2b0 kernel/entry/common.c:212 do_syscall_64+0xe0/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fe0cbc7e0d7 RSP: 002b:00007ffd97c22638 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fe0cbc7e0d7 RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffd97c226f0 RBP: 00007ffd97c226f0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd97c237b0 R13: 00007fe0cbcc83b9 R14: 00000000000ffd2a R15: 0000000000000005 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8d1acba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #0: ffffffff8d1acba0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #0: ffffffff8d1acba0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614 2 locks held by klogd/4498: #0: ffff8880b983ccd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559 #1: ffff8880b9828a08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2d9/0x900 kernel/sched/psi.c:988 2 locks held by getty/4810: #0: ffff88802965f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc9000311b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc6/0x1490 drivers/tty/n_tty.c:2201 1 lock held by syz-executor.0/5122: #0: ffff88805f1800e0 (&type->s_umount_key#48){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88805f1800e0 (&type->s_umount_key#48){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88805f1800e0 (&type->s_umount_key#48){+.+.}-{3:3}, at: deactivate_super+0xd6/0x100 fs/super.c:509 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x277/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x299/0x300 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+0xf87/0x1210 kernel/hung_task.c:379 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 </TASK> Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5143 Comm: kworker/u4:0 Not tainted 6.8.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:check_preemption_disabled+0x4/0xe0 lib/smp_processor_id.c:13 Code: 85 c0 74 1a 65 8b 05 73 73 74 75 85 c0 75 0f 65 8b 05 7c 70 74 75 85 c0 74 04 90 0f 0b 90 e9 83 fc ff ff 0f 1f 00 41 54 55 53 <48> 83 ec 08 65 8b 1d 8d aa 75 75 65 8b 05 82 aa 75 75 a9 ff ff ff RSP: 0018:ffffc900048af8f8 EFLAGS: 00000046 RAX: a6d04142908fb997 RBX: ffff888028e93b80 RCX: 1ffffffff242ab72 RDX: 0000000000000000 RSI: ffffffff8accade0 RDI: ffffffff8b2fd140 RBP: ffffffff817c6a23 R08: 0000000000000001 R09: fffffbfff242a9e8 R10: ffffffff92154f47 R11: 0000000000000006 R12: 0000000000000002 R13: ffffffff817c6e50 R14: ffffffff812ff380 R15: ffff8880b983de80 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe6542c2f8 CR3: 000000000cf78000 CR4: 0000000000350ef0 Call Trace: <NMI> </NMI> <TASK> lockdep_hardirqs_on+0x7d/0x110 kernel/locking/lockdep.c:4421 smp_call_function_many_cond+0x1223/0x1550 kernel/smp.c:847 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2087 [inline] text_poke_bp_batch+0x22b/0x750 arch/x86/kernel/alternative.c:2297 text_poke_flush arch/x86/kernel/alternative.c:2488 [inline] text_poke_flush arch/x86/kernel/alternative.c:2485 [inline] text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2495 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x1d7/0x400 kernel/jump_label.c:829 static_key_disable_cpuslocked+0x154/0x1c0 kernel/jump_label.c:235 static_key_disable+0x1a/0x20 kernel/jump_label.c:243 toggle_allocation_gate mm/kfence/core.c:831 [inline] toggle_allocation_gate+0x13f/0x250 mm/kfence/core.c:818 process_one_work+0x886/0x15d0 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2787 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
