INFO: task syz-executor:5077 blocked for more than 143 seconds.
Not tainted 6.10.0-rc6-syzkaller-00069-g795c58e4c7fc #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:19320 pid:5077 tgid:5077 ppid:1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x1796/0x49d0 kernel/sched/core.c:6745
__schedule_loop kernel/sched/core.c:6822 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6837
io_schedule+0x8d/0x110 kernel/sched/core.c:9043
folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1307
folio_wait_writeback+0xe7/0x1e0 mm/page-writeback.c:3140
truncate_inode_pages_range+0xafd/0xfc0 mm/truncate.c:414
v9fs_evict_inode+0x1fd/0x360 fs/9p/vfs_inode.c:352
evict+0x2a8/0x630 fs/inode.c:667
__dentry_kill+0x20d/0x630 fs/dcache.c:603
dput+0x19f/0x2b0 fs/dcache.c:845
shrink_dcache_for_umount+0x7d/0x130 fs/dcache.c:1555
generic_shutdown_super+0x6a/0x2d0 fs/super.c:620
kill_anon_super+0x3b/0x70 fs/super.c:1226
v9fs_kill_super+0x4c/0x90 fs/9p/vfs_super.c:193
deactivate_locked_super+0xc4/0x130 fs/super.c:473
cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1267
task_work_run+0x24f/0x310 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:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x168/0x360 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff5c5d76f07
RSP: 002b:00007ffc5fc0a428 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007ff5c5d76f07
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc5fc0a4e0
RBP: 00007ffc5fc0a4e0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc5fc0b5b0
R13: 00007ff5c5de3515 R14: 000000000001f918 R15: 0000000000000017
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e333f20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
#0: ffffffff8e333f20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
#0: ffffffff8e333f20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4832:
#0: ffff88802a9dc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f162f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5077:
#0: ffff88806e6aa0e0 (&type->s_umount_key#50){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88806e6aa0e0 (&type->s_umount_key#50){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88806e6aa0e0 (&type->s_umount_key#50){+.+.}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
4 locks held by kworker/1:6/5130:
3 locks held by syz.4.638/7719:
#0: ffff88802632d220 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:683 [inline]
#0: ffff88802632d220 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x2f9/0x6e0 mm/memory.c:5845
#1: ffff8880294ce518 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1655 [inline]
#1: ffff8880294ce518 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1820 [inline]
#1: ffff8880294ce518 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1f0/0xdf0 fs/ext4/inode.c:6052
#2: ffff8880294d2950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x203f/0x22a0 fs/jbd2/transaction.c:463
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 30 Comm: khungtaskd Not tainted 6.10.0-rc6-syzkaller-00069-g795c58e4c7fc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
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+0xfde/0x1020 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 1102 Comm: kworker/u8:6 Not tainted 6.10.0-rc6-syzkaller-00069-g795c58e4c7fc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: events_unbound flush_memcg_stats_dwork
RIP: 0010:mem_cgroup_css_rstat_flush+0x1cb/0x910
Code: 48 b8 00 00 00 00 00 fc ff df 80 3c 03 00 74 08 4c 89 f7 e8 07 c0 f7 ff 4d 89 e7 48 8b 44 24 18 4c 2b bc 28 d8 01 00 00 75 11 <49> bc 00 00 00 00 00 fc ff df 4c 8b 74 24 20 eb 71 48 b8 00 00 00
RSP: 0018:ffffc900045778f0 EFLAGS: 00000046
RAX: ffffe8ffffc74600 RBX: 1ffffd1ffff8e8fd RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffe8ffffc74628
RBP: 0000000000000010 R08: ffffffff818ea5ad R09: 1ffffffff25ee2b0
R10: dffffc0000000000 R11: ffffffff8200d090 R12: fffffffffffff9b9
R13: 0000000000000000 R14: ffffe8ffffc747e8 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9855ece2d8 CR3: 000000000e132000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
cgroup_rstat_flush_locked+0x16da/0x1e80 kernel/cgroup/rstat.c:322
cgroup_rstat_flush+0x38/0x50 kernel/cgroup/rstat.c:354
do_flush_stats mm/memcontrol.c:879 [inline]
flush_memcg_stats_dwork+0x62/0xa0 mm/memcontrol.c:916
process_one_work kernel/workqueue.c:3248 [inline]
process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3329
worker_thread+0x86d/0xd50 kernel/workqueue.c:3409
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