INFO: task syz-executor:5778 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21704 pid:5778 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
io_schedule+0x80/0xd0 kernel/sched/core.c:9023
folio_wait_bit_common+0x714/0xfa0 mm/filemap.c:1329
__filemap_get_folio+0xbc/0xbb0 mm/filemap.c:1910
truncate_inode_pages_range+0x46b/0xfb0 mm/truncate.c:401
evict+0x4dd/0x8d0 fs/inode.c:707
dispose_list fs/inode.c:738 [inline]
evict_inodes+0x606/0x6a0 fs/inode.c:792
generic_shutdown_super+0x97/0x2b0 fs/super.c:672
kill_block_super+0x44/0x90 fs/super.c:1660
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x43b/0x4d0 fs/namespace.c:1259
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f221639c117
RSP: 002b:00007ffc3822a398 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f221640471f RCX: 00007f221639c117
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc3822a450
RBP: 00007ffc3822a450 R08: 00007ffc3822b450 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc3822b4e0
R13: 00007f221640471f R14: 000000000004bab8 R15: 00007ffc3822b520
Showing all locks held in the system:
5 locks held by kworker/0:1/9:
1 lock held by khungtaskd/29:
#0: ffffffff8d131fe0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8d131fe0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8d131fe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by getty/5531:
#0: ffff8880316da0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000326e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x433/0x1390 drivers/tty/n_tty.c:2217
4 locks held by syz-executor/5773:
#0: ffff8880b8f3c018 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
#1: ffff8880b8f289c0 (psi_seq){-.-.}-{0:0}, at: psi_sched_switch kernel/sched/stats.h:189 [inline]
#1: ffff8880b8f289c0 (psi_seq){-.-.}-{0:0}, at: __schedule+0x2176/0x45a0 kernel/sched/core.c:6695
#2: ffffffff8d131fe0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#2: ffffffff8d131fe0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#2: ffffffff8d131fe0 (rcu_read_lock){....}-{1:2}, at: percpu_ref_tryget_many include/linux/percpu-refcount.h:241 [inline]
#2: ffffffff8d131fe0 (rcu_read_lock){....}-{1:2}, at: percpu_ref_tryget+0x15/0x180 include/linux/percpu-refcount.h:266
#3: ffff88814ccee990 (elock-AF_INET6){....}-{2:2}, at: skb_dequeue net/core/skbuff.c:3697 [inline]
#3: ffff88814ccee990 (elock-AF_INET6){....}-{2:2}, at: skb_queue_purge_reason+0x36/0x1c0 net/core/skbuff.c:3738
1 lock held by syz-executor/5778:
#0: ffff88807c5080e0 (&type->s_umount_key#92){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807c5080e0 (&type->s_umount_key#92){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807c5080e0 (&type->s_umount_key#92){+.+.}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 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+0xf3d/0xf80 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 15964 Comm: rm Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:debug_lockdep_rcu_enabled+0x20/0x30 kernel/rcu/update.c:320
Code: cc cc cc cc cc cc cc cc cc cc f3 0f 1e fa 31 c0 83 3d 4f c9 06 04 00 74 1d 83 3d d6 fc 06 04 00 74 14 65 48 8b 0d e0 a3 7f 75 <31> c0 83 b9 dc 0a 00 00 00 0f 94 c0 c3 cc cc cc 66 0f 1f 00 48 8b
RSP: 0018:ffffc900149378e0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffffff81ea3d6d RCX: ffff888029fc3c00
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff2237ca0
R10: dffffc0000000000 R11: fffffbfff2237ca1 R12: dffffc0000000000
R13: 0000000000000008 R14: 0000000000074f8b R15: ffff88813fff91c0
FS: 00007fc065453c80(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc065627a90 CR3: 00000000523a9000 CR4: 00000000003506e0
Call Trace:
rcu_read_unlock_sched include/linux/rcupdate.h:897 [inline]
pfn_valid+0x33d/0x420 include/linux/mmzone.h:2021
page_table_check_clear+0x1e/0x6a0 mm/page_table_check.c:70
page_table_check_pte_clear include/linux/page_table_check.h:49 [inline]
ptep_get_and_clear arch/x86/include/asm/pgtable.h:1269 [inline]
__ptep_modify_prot_start include/linux/pgtable.h:1067 [inline]
ptep_modify_prot_start include/linux/pgtable.h:1100 [inline]
change_pte_range mm/mprotect.c:164 [inline]
change_pmd_range mm/mprotect.c:420 [inline]
change_pud_range mm/mprotect.c:453 [inline]
change_p4d_range mm/mprotect.c:476 [inline]
change_protection_range mm/mprotect.c:504 [inline]
change_protection+0x1f47/0x3200 mm/mprotect.c:538
mprotect_fixup+0x929/0xca0 mm/mprotect.c:666
do_mprotect_pkey+0x7c2/0xcb0 mm/mprotect.c:819
__do_sys_mprotect mm/mprotect.c:840 [inline]
__se_sys_mprotect mm/mprotect.c:837 [inline]
__x64_sys_mprotect+0x80/0x90 mm/mprotect.c:837
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc0657e22c7
Code: 89 3d fd 3f 01 00 eb 90 0f 1f 00 f7 d8 89 05 f0 3f 01 00 48 c7 c0 ff ff ff ff eb 91 0f 1f 80 00 00 00 00 b8 0a 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d c9 3f 01 00 f7 d8 89 01 48 83
RSP: 002b:00007ffd04c6abc8 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007fc0654c10c0 RCX: 00007fc0657e22c7
RDX: 0000000000000001 RSI: 0000000000001000 RDI: 00007fc0654be000
RBP: 00007ffd04c6ae90 R08: 0000000000000000 R09: 00007fc06555cc90
R10: 00007fc0654c10c0 R11: 0000000000000206 R12: 0000000000000030
R13: 000000f4553644f0 R14: 0000000000000000 R15: 00007fc0657f6310