INFO: task syz-executor306:5831 blocked for more than 143 seconds.
Not tainted 6.13.0-rc4-syzkaller-00012-g9b2ffa6148b1 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor306 state:D stack:25784 pid:5831 tgid:5828 ppid:5827 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0x17fb/0x4be0 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6848
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905
__mutex_lock_common kernel/locking/mutex.c:665 [inline]
__mutex_lock+0x7e7/0xee0 kernel/locking/mutex.c:735
exfat_lookup+0x143/0x1e70 fs/exfat/namei.c:726
__lookup_slow+0x28c/0x3f0 fs/namei.c:1791
lookup_slow+0x53/0x70 fs/namei.c:1808
walk_component+0x2e1/0x410 fs/namei.c:2112
lookup_last fs/namei.c:2610 [inline]
path_lookupat+0x16f/0x450 fs/namei.c:2634
filename_lookup+0x2a3/0x670 fs/namei.c:2663
user_path_at+0x3a/0x60 fs/namei.c:3070
do_fchownat+0xed/0x240 fs/open.c:803
__do_sys_lchown fs/open.c:834 [inline]
__se_sys_lchown fs/open.c:832 [inline]
__x64_sys_lchown+0x85/0xa0 fs/open.c:832
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: 0033:0x7f02ec6df409
RSP: 002b:00007f02ec675218 EFLAGS: 00000246 ORIG_RAX: 000000000000005e
RAX: ffffffffffffffda RBX: 00007f02ec7675f8 RCX: 00007f02ec6df409
RDX: 00000000ffffffff RSI: 000000000000ee00 RDI: 0000000020000140
RBP: 00007f02ec7675f0 R08: 00007ffd57b68e47 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0032656c69662f2e
R13: 00007f02ec7330c0 R14: 00000000200002c0 R15: 0030656c69662f2e
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744
2 locks held by getty/5584:
#0: ffff8880322ee0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
5 locks held by syz-executor306/5830:
2 locks held by syz-executor306/5831:
#0: ffff8880775582a0 (&sb->s_type->i_mutex_key#14){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:828 [inline]
#0: ffff8880775582a0 (&sb->s_type->i_mutex_key#14){++++}-{4:4}, at: lookup_slow+0x45/0x70 fs/namei.c:1807
#1: ffff8880341aa0e8 (&sbi->s_lock){+.+.}-{4:4}, at: exfat_lookup+0x143/0x1e70 fs/exfat/namei.c:726
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc4-syzkaller-00012-g9b2ffa6148b1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__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:234 [inline]
watchdog+0xff6/0x1040 kernel/hung_task.c:397
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 UID: 0 PID: 5830 Comm: syz-executor306 Not tainted 6.13.0-rc4-syzkaller-00012-g9b2ffa6148b1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__exfat_free_cluster+0x685/0x990
Code: ff 44 89 e9 41 d3 ee 8b 5c 24 0c 89 df 44 89 f6 e8 70 4a 26 ff 44 39 f3 0f 85 b1 00 00 00 e8 a2 48 26 ff 31 db 44 89 74 24 0c <49> bd 00 00 00 00 00 fc ff df eb 2d e8 8a 48 26 ff 48 8b 5c 24 48
RSP: 0018:ffffc90003dbf3a0 EFLAGS: 00000246
RAX: ffffffff82792b3e RBX: 0000000000000000 RCX: ffff888035a00000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003dbf4b8 R08: ffffffff82792b30 R09: ffffffff827920e7
R10: 0000000000000003 R11: ffff888035a00000 R12: 000000000000000d
R13: 0000000000000009 R14: 0000000000000000 R15: ffff8880775e8180
FS: 00007f02ec6966c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005646d01f3600 CR3: 0000000035264000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
exfat_free_cluster+0x77/0xd0 fs/exfat/fatent.c:232
__exfat_truncate+0x745/0xa60 fs/exfat/file.c:235
exfat_truncate fs/exfat/file.c:257 [inline]
exfat_setattr+0x10fa/0x1a90 fs/exfat/file.c:353
notify_change+0xbca/0xe90 fs/attr.c:552
do_truncate+0x220/0x310 fs/open.c:65
handle_truncate fs/namei.c:3449 [inline]
do_open fs/namei.c:3832 [inline]
path_openat+0x2e1e/0x3590 fs/namei.c:3987
do_filp_open+0x27f/0x4e0 fs/namei.c:4014
do_sys_openat2+0x13e/0x1d0 fs/open.c:1402
do_sys_open fs/open.c:1417 [inline]
__do_sys_creat fs/open.c:1495 [inline]
__se_sys_creat fs/open.c:1489 [inline]
__x64_sys_creat+0x123/0x170 fs/open.c:1489
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: 0033:0x7f02ec6df409
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f02ec696218 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f02ec7675e8 RCX: 00007f02ec6df409
RDX: 00007f02ec6df409 RSI: 0000000000000020 RDI: 0000000020000200
RBP: 00007f02ec7675e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0032656c69662f2e
R13: 00007f02ec7330c0 R14: 00000000200002c0 R15: 0030656c69662f2e
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.489 msecs