INFO: task syz.1.1782:13206 blocked for more than 145 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1782      state:D stack:27496 pid:13206 ppid:5791   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6832
 rwsem_down_read_slowpath+0x4f8/0x840 kernel/locking/rwsem.c:1086
 __down_read_common kernel/locking/rwsem.c:1250 [inline]
 __down_read kernel/locking/rwsem.c:1263 [inline]
 down_read+0x98/0x2e0 kernel/locking/rwsem.c:1522
 __super_lock fs/super.c:58 [inline]
 super_lock+0x167/0x360 fs/super.c:117
 super_lock_shared fs/super.c:146 [inline]
 iterate_supers+0x80/0x170 fs/super.c:977
 ksys_sync+0x95/0x150 fs/sync.c:102
 __ia32_sys_sync+0xe/0x20 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd4cd78f749
RSP: 002b:00007fd4ce660038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fd4cd9e5fa0 RCX: 00007fd4cd78f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fd4cd9e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd4cd9e6038 R14: 00007fd4cd9e5fa0 R15: 00007ffed88f14f8
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/0:1/9:
1 lock held by khungtaskd/29:
 #0: ffffffff8cd2fee0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 #0: ffffffff8cd2fee0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
 #0: ffffffff8cd2fee0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by getty/5558:
 #0: ffff88802cff70a0 (&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+0x425/0x1380 drivers/tty/n_tty.c:2217
1 lock held by syz-executor/5790:
 #0: ffff888025a2c0e0 (&type->s_umount_key#68){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff888025a2c0e0 (&type->s_umount_key#68){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff888025a2c0e0 (&type->s_umount_key#68){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
1 lock held by syz.1.1782/13206:
 #0: ffff888025a2c0e0 (&type->s_umount_key#68){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff888025a2c0e0 (&type->s_umount_key#68){++++}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117
6 locks held by dhcpcd/14191:

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

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 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x39b/0x3d0 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+0xf41/0xf80 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
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5458 Comm: dhcpcd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:193 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x36/0x80 kernel/kcov.c:320
Code: e0 23 7e 7e 65 8b 15 e1 23 7e 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 83 b9 1c 16 00 00 00 74 4e 8b 91 f8 15 00 00 <83> fa 03 75 43 48 8b 91 00 16 00 00 44 8b 89 fc 15 00 00 49 c1 e1
RSP: 0000:ffffc90003727af8 EFLAGS: 00000046
RAX: ffffffff81b7f887 RBX: ffffea0000db7240 RCX: ffff88802a7a3c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffea0000db7248 R08: ffffea0000db7247 R09: 1ffffd40001b6e48
R10: dffffc0000000000 R11: fffff940001b6e49 R12: 1ffffd40001b6e49
R13: dffffc0000000000 R14: 00fff000000a0108 R15: 1ffffd40001b6e48
FS:  00007fe5deb79740(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005629ab6ca000 CR3: 000000003070a000 CR4: 00000000003506e0
DR0: 0000000000000008 DR1: 0000000000000002 DR2: 0000000000000081
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
 arch_test_bit arch/x86/include/asm/bitops.h:239 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
 folio_test_head include/linux/page-flags.h:798 [inline]
 folio_test_large include/linux/page-flags.h:819 [inline]
 folio_nr_pages include/linux/mm.h:2056 [inline]
 lru_add_fn+0x107/0x1720 mm/swap.c:158
 folio_batch_move_lru+0x2e7/0x6b0 mm/swap.c:209
 folio_add_lru+0x434/0xd50 mm/swap.c:509
 do_anonymous_page mm/memory.c:4191 [inline]
 do_pte_missing mm/memory.c:3686 [inline]
 handle_pte_fault mm/memory.c:5025 [inline]
 __handle_mm_fault mm/memory.c:5166 [inline]
 handle_mm_fault+0x34fb/0x4920 mm/memory.c:5331
 do_user_addr_fault+0xad0/0x12e0 arch/x86/mm/fault.c:1324
 handle_page_fault arch/x86/mm/fault.c:1465 [inline]
 exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7fe5decd3b93
Code: c5 fe 7f 47 40 c5 fe 7f 47 60 0f 01 d6 75 04 c5 f8 77 c3 c5 fc 77 c3 48 3b 15 69 07 08 00 73 77 40 0f b6 c6 48 89 d1 48 89 fa <f3> aa 48 89 d0 eb d9 66 0f 1f 44 00 00 c4 e2 79 78 c0 83 fa 10 7d
RSP: 002b:00007ffdab48b5c8 EFLAGS: 00010283
RAX: 0000000000000000 RBX: 00007ffdab48b660 RCX: 0000000000002b18
RDX: 00005629ab6c0e20 RSI: 0000000000000000 RDI: 00005629ab6ca000
RBP: 0000000000008ab8 R08: 00007fe5ded4dac0 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000002 R12: 000000000000bcf8
R13: 00005629ab697ec0 R14: 00007ffdab48bad8 R15: 0000000000000064
 </TASK>