INFO: task syz.1.1316:10202 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc3-syzkaller-00454-gdb87114dcf13 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1316      state:D stack:24608 pid:10202 tgid:10201 ppid:9472   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x18af/0x4bd0 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6782
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6839
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752
 exfat_sync_fs+0xb0/0x160 fs/exfat/super.c:56
 iterate_supers+0xc8/0x190 fs/super.c:934
 ksys_sync+0xdb/0x1c0 fs/sync.c:104
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fea8ad7dff9
RSP: 002b:00007fea8bbde038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fea8af35f80 RCX: 00007fea8ad7dff9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fea8adf0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fea8af35f80 R15: 00007ffd0e2aa7d8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720
1 lock held by dhcpcd/4890:
2 locks held by getty/4973:
 #0: ffff88802e8530a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900031232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
3 locks held by kworker/0:6/5289:
3 locks held by syz.1.1055/9356:
2 locks held by syz.1.1316/10202:
 #0: ffff88807acea0e0 (&type->s_umount_key#77){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88807acea0e0 (&type->s_umount_key#77){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
 #1: ffff88807ace80e8 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0xb0/0x160 fs/exfat/super.c:56
2 locks held by kworker/u8:13/10500:
2 locks held by syz.4.1478/10774:
 #0: ffff88807acea0e0 (&type->s_umount_key#77){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88807acea0e0 (&type->s_umount_key#77){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
 #1: ffff88807ace80e8 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0xb0/0x160 fs/exfat/super.c:56
2 locks held by syz.1.1824/11718:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc3-syzkaller-00454-gdb87114dcf13 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 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+0xff4/0x1040 kernel/hung_task.c:379
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11461 Comm: syz-executor Not tainted 6.12.0-rc3-syzkaller-00454-gdb87114dcf13 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:get_current arch/x86/include/asm/current.h:49 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x8/0x90 kernel/kcov.c:300
Code: 49 56 5b 0a 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 4c 8b 04 24 <65> 48 8b 14 25 c0 d7 03 00 65 8b 05 d0 ec 6e 7e 25 00 01 ff 00 74
RSP: 0018:ffffc90003d2fa38 EFLAGS: 00000247
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81369d72
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000000000001 R08: ffffffff81369d8f R09: 1ffffffff2039fe5
R10: dffffc0000000000 R11: fffffbfff2039fe6 R12: 0000000000000000
R13: 1ffff11005673e30 R14: ffff88802b39da00 R15: dffffc0000000000
FS:  000055556f55f500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b0ba094600 CR3: 000000006c596000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 variable_test_bit arch/x86/include/asm/bitops.h:227 [inline]
 arch_test_bit arch/x86/include/asm/bitops.h:239 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
 cpumask_test_cpu include/linux/cpumask.h:570 [inline]
 cpu_online include/linux/cpumask.h:1117 [inline]
 trace_x86_fpu_regs_activated arch/x86/include/asm/trace/fpu.h:57 [inline]
 fpregs_activate+0x7f/0x200 arch/x86/kernel/fpu/context.h:50
 fpregs_mark_activate+0x28/0x90 arch/x86/kernel/fpu/core.c:831
 restore_fpregs_from_user arch/x86/kernel/fpu/signal.c:347 [inline]
 __fpu_restore_sig arch/x86/kernel/fpu/signal.c:376 [inline]
 fpu__restore_sig+0x95b/0x11b0 arch/x86/kernel/fpu/signal.c:510
 restore_sigcontext+0x675/0x7d0 arch/x86/kernel/signal_64.c:95
 __do_sys_rt_sigreturn+0x1a1/0x270 arch/x86/kernel/signal_64.c:266
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f52e1f7d757
Code: 44 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb bc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fff87623988 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007f52e1f7d757
RDX: 00000000ffffffff RSI: 0000000000008933 RDI: 0000000000000005
RBP: ffffffffffffffa8 R08: 0000000000000005 R09: 00356d6973766564
R10: 00007fff87623dc6 R11: 0000000000000286 R12: 0000000000000013
R13: 00007fff87623b00 R14: 00007f52e2c64620 R15: 00007fff87623b00
 </TASK>