syzbot


INFO: task hung in do_renameat2

Status: upstream: reported on 2024/01/30 03:00
Reported-by: syzbot+8aebd3fa24fb1521f74d@syzkaller.appspotmail.com
First crash: 94d, last: 94d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in do_renameat2 f2fs 2 241d 275d 0/26 auto-obsoleted due to no activity on 2023/12/04 15:30

Sample crash report:
INFO: task syz-executor.4:20356 blocked for more than 143 seconds.
      Not tainted 6.1.75-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:0     pid:20356 ppid:4267   flags:0x00000005
Call trace:
 __switch_to+0x320/0x754 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0xee4/0x1c98 kernel/sched/core.c:6558
 schedule+0xc4/0x170 kernel/sched/core.c:6634
 rwsem_down_write_slowpath+0xc80/0x156c kernel/locking/rwsem.c:1189
 __down_write_common kernel/locking/rwsem.c:1314 [inline]
 __down_write kernel/locking/rwsem.c:1323 [inline]
 down_write_nested+0x90/0x94 kernel/locking/rwsem.c:1690
 inode_lock_nested include/linux/fs.h:791 [inline]
 lock_rename fs/namei.c:3042 [inline]
 do_renameat2+0x4e0/0xe34 fs/namei.c:4954
 __do_sys_renameat fs/namei.c:5055 [inline]
 __se_sys_renameat fs/namei.c:5052 [inline]
 __arm64_sys_renameat+0xc8/0xe4 fs/namei.c:5052
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffff800015a04eb0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:516
1 lock held by rcu_tasks_trace/13:
 #0: ffff800015a056b0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:516
1 lock held by khungtaskd/28:
 #0: ffff800015a04ce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:317
2 locks held by getty/3981:
 #0: ffff0000d8040098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80001bcc02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1214 drivers/tty/n_tty.c:2188
2 locks held by syz-executor.4/20356:
 #0: ffff0000cedcc460 (sb_writers#17){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:393
 #1: ffff000122d11cb0 (&sb->s_type->i_mutex_key#23/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:791 [inline]
 #1: ffff000122d11cb0 (&sb->s_type->i_mutex_key#23/1){+.+.}-{3:3}, at: lock_rename fs/namei.c:3042 [inline]
 #1: ffff000122d11cb0 (&sb->s_type->i_mutex_key#23/1){+.+.}-{3:3}, at: do_renameat2+0x4e0/0xe34 fs/namei.c:4954
3 locks held by syz-executor.4/20362:
2 locks held by syz-executor.4/20700:
3 locks held by kworker/u4:19/23406:
2 locks held by kworker/u4:21/23411:
2 locks held by kworker/u4:25/23663:
 #0: ffff0000c0029138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2265
 #1: ffff80002a8c7c20 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2267
2 locks held by syz-executor.0/26936:

=============================================


Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/01/30 03:00 linux-6.1.y 883d1a956208 991a98f4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 INFO: task hung in do_renameat2
* Struck through repros no longer work on HEAD.