syzbot


INFO: task hung in ntfs_evict_big_inode

Status: upstream: reported syz repro on 2024/01/26 18:22
Subsystems: ntfs3
[Documentation on labels]
Reported-by: syzbot+826187129aa8a9eb81be@syzkaller.appspotmail.com
First crash: 153d, last: 89d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ntfs?] INFO: task hung in ntfs_evict_big_inode 0 (1) 2024/01/26 18:22
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/02/07 05:54 21m retest repro upstream OK log

Sample crash report:
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>

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/01/22 18:12 upstream 6613476e225e 9bd8dcda .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-root INFO: task hung in ntfs_evict_big_inode
2024/01/22 14:31 upstream 6613476e225e 9bd8dcda .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in ntfs_evict_big_inode
2023/11/21 09:06 upstream 98b1cc82c4af cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in ntfs_evict_big_inode
2023/11/19 19:22 upstream 037266a5f723 cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in ntfs_evict_big_inode
* Struck through repros no longer work on HEAD.