INFO: task syz.4.276:8232 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.276 state:D stack:28968 pid:8232 tgid:8227 ppid:5836 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7339
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1647 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked+0x1e04/0x25e0 kernel/locking/rtmutex.c:1760
rt_mutex_slowlock+0xb5/0x160 kernel/locking/rtmutex.c:1800
__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
rwbase_write_lock+0x14f/0x750 kernel/locking/rwbase_rt.c:244
inode_lock_nested include/linux/fs.h:915 [inline]
filename_create+0x1f8/0x3c0 fs/namei.c:4139
do_mknodat+0x184/0x4d0 fs/namei.c:4272
__do_sys_mknod fs/namei.c:4318 [inline]
__se_sys_mknod fs/namei.c:4316 [inline]
__x64_sys_mknod+0x8c/0xa0 fs/namei.c:4316
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f093bf7eba9
RSP: 002b:00007f093a1c5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007f093c1c6090 RCX: 00007f093bf7eba9
RDX: 0000000000000709 RSI: 0000000000000000 RDI: 0000200000000000
RBP: 00007f093c001e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f093c1c6128 R14: 00007f093c1c6090 R15: 00007ffc43e27d88
INFO: task syz.4.276:8233 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.276 state:D stack:28584 pid:8233 tgid:8227 ppid:5836 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7339
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1647 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked+0x1e04/0x25e0 kernel/locking/rtmutex.c:1760
rt_mutex_slowlock+0xb5/0x160 kernel/locking/rtmutex.c:1800
__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
rwbase_write_lock+0x14f/0x750 kernel/locking/rwbase_rt.c:244
inode_lock include/linux/fs.h:870 [inline]
open_last_lookups fs/namei.c:3804 [inline]
path_openat+0x8e6/0x3840 fs/namei.c:4043
do_filp_open+0x1fa/0x410 fs/namei.c:4073
do_sys_openat2+0x121/0x1c0 fs/open.c:1435
do_sys_open fs/open.c:1450 [inline]
__do_sys_creat fs/open.c:1528 [inline]
__se_sys_creat fs/open.c:1522 [inline]
__x64_sys_creat+0x8f/0xc0 fs/open.c:1522
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f093bf7eba9
RSP: 002b:00007f093a1a4038 EFLAGS: 000002[ 459.390162][ T39] RSP: 002b:00007f093a1a4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f093c1c6180 RCX: 00007f093bf7eba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000e00
RBP: 00007f093c001e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f093c1c6218 R14: 00007f093c1c6180 R15: 00007ffc43e27d88
INFO: task syz.4.276:8234 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.276 state:D stack:26920 pid:8234 tgid:8227 ppid:5836 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7339
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1647 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked+0x1e04/0x25e0 kernel/locking/rtmutex.c:1760
__rwbase_read_lock+0xbc/0x180 kernel/locking/rwbase_rt.c:114
rwbase_read_lock kernel/locking/rwbase_rt.c:147 [inline]
__down_read kernel/locking/rwsem.c:1466 [inline]
down_read+0x127/0x1f0 kernel/locking/rwsem.c:1539
inode_lock_shared include/linux/fs.h:885 [inline]
lookup_slow+0x46/0x70 fs/namei.c:1824
walk_component+0x2d2/0x400 fs/namei.c:2129
lookup_last fs/namei.c:2630 [inline]
path_lookupat+0x163/0x430 fs/namei.c:2654
filename_lookup+0x212/0x570 fs/namei.c:2683
kern_path+0x35/0x50 fs/namei.c:2816
lookup_bdev block/bdev.c:1205 [inline]
bdev_file_open_by_path+0xc8/0x4d0 block/bdev.c:1078
btrfs_scan_one_device+0xa6/0x650 fs/btrfs/volumes.c:1472
btrfs_control_ioctl+0x224/0x360 fs/btrfs/super.c:2245
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:598 [inline]
__se_sys_ioctl+0xff/0x170 fs/ioctl.c:584
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f093bf7eba9
RSP: 002b:00007f0939d81038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f093c1c6270 RCX: 00007f093bf7eba9
RDX: 00002000000004c0 RSI: 0000000050009404 RDI: 0000000000000008
RBP: 00007f093c001e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f093c1c6308 R14: 00007f093c1c6270 R15: 00007ffc43e27d88
INFO: task syz.4.276:8237 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.276 state:D stack:28584 pid:8237 tgid:8227 ppid:5836 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7339
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1647 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked+0x1e04/0x25e0 kernel/locking/rtmutex.c:1760
rt_mutex_slowlock+0xb5/0x160 kernel/locking/rtmutex.c:1800
__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
rwbase_write_lock+0x14f/0x750 kernel/locking/rwbase_rt.c:244
inode_lock include/linux/fs.h:870 [inline]
open_last_lookups fs/namei.c:3804 [inline]
path_openat+0x8e6/0x3840 fs/namei.c:4043
do_filp_open+0x1fa/0x410 fs/namei.c:4073
do_sys_openat2+0x121/0x1c0 fs/open.c:1435
do_sys_open fs/open.c:1450 [inline]
__do_sys_openat fs/open.c:1466 [inline]
__se_sys_openat fs/open.c:1461 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1461
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f093bf7eba9
RSP: 002b:00007f093995e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f093c1c6360 RCX: 00007f093bf7eba9
RDX: 000000000000275a RSI: 0000200000000640 RDI: ffffffffffffff9c
RBP: 00007f093c001e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f093c1c63f8 R14: 00007f093c1c6360 R15: 00007ffc43e27d88
INFO: task syz.4.276:8238 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.276 state:D stack:29224 pid:8238 tgid:8227 ppid:5836 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7339
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1647 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked+0x1e04/0x25e0 kernel/locking/rtmutex.c:1760
rt_mutex_slowlock+0xb5/0x160 kernel/locking/rtmutex.c:1800
__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
rwbase_write_lock+0x14f/0x750 kernel/locking/rwbase_rt.c:244
inode_lock_nested include/linux/fs.h:915 [inline]
filename_create+0x1f8/0x3c0 fs/namei.c:4139
do_mkdirat+0xa0/0x590 fs/namei.c:4391
__do_sys_mkdir fs/namei.c:4421 [inline]
__se_sys_mkdir fs/namei.c:4419 [inline]
__x64_sys_mkdir+0x6c/0x80 fs/namei.c:4419
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f093bf7eba9
RSP: 002b:00007f093953b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f093c1c6450 RCX: 00007f093bf7eba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000300
RBP: 00007f093c001e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f093c1c64e8 R14: 00007f093c1c6450 R15: 00007ffc43e27d88
INFO: task syz.4.276:8239 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.276 state:D stack:29224 pid:8239 tgid:8227 ppid:5836 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7339
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1647 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked+0x1e04/0x25e0 kernel/locking/rtmutex.c:1760
rt_mutex_slowlock+0xb5/0x160 kernel/locking/rtmutex.c:1800
__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
rwbase_write_lock+0x14f/0x750 kernel/locking/rwbase_rt.c:244
inode_lock_nested include/linux/fs.h:915 [inline]
filename_create+0x1f8/0x3c0 fs/namei.c:4139
do_symlinkat+0xbc/0x3f0 fs/namei.c:4749
__do_sys_symlink fs/namei.c:4777 [inline]
__se_sys_symlink fs/namei.c:4775 [inline]
__x64_sys_symlink+0x7a/0x90 fs/namei.c:4775
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f093bf7eba9
RSP: 002b:00007f0939118038 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00007f093c1c6540 RCX: 00007f093bf7eba9
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 00002000000005c0
RBP: 00007f093c001e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f093c1c65d8 R14: 00007f093c1c6540 R15: 00007ffc43e27d88
Showing all locks held in the system:
1 lock held by khungtaskd/39:
#0: ffffffff8d9a8d80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8d9a8d80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8d9a8d80 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
4 locks held by kworker/u8:5/152:
#0: ffff8881404bb138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff8881404bb138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319
#1: ffffc90003a1fbc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc90003a1fbc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3319
#2: ffff88805794e0d0 (&type->s_umount_key#87){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0 fs/super.c:563
#3: ffff8880605ba928 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530 fs/jfs/inode.c:102
6 locks held by kworker/u8:6/971:
3 locks held by kworker/u8:7/972:
2 locks held by kworker/0:2/1202:
3 locks held by kworker/u8:11/3011:
2 locks held by getty/5596:
#0: ffff88823bf768a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e762e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x444/0x1410 drivers/tty/n_tty.c:2222
1 lock held by udevd/5891:
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x111/0x360 fs/btrfs/super.c:2258
1 lock held by udevd/5898:
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x111/0x360 fs/btrfs/super.c:2258
1 lock held by udevd/5979:
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x111/0x360 fs/btrfs/super.c:2258
4 locks held by syz.4.276/8228:
2 locks held by syz.4.276/8232:
#0: ffff88805794e488 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff8880605bacf8 (&type->i_mutex_dir_key#17/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:915 [inline]
#1: ffff8880605bacf8 (&type->i_mutex_dir_key#17/1){+.+.}-{4:4}, at: filename_create+0x1f8/0x3c0 fs/namei.c:4139
2 locks held by syz.4.276/8233:
#0: ffff88805794e488 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff8880605bacf8 (&type->i_mutex_dir_key#17){++++}-{4:4}, at: inode_lock include/linux/fs.h:870 [inline]
#1: ffff8880605bacf8 (&type->i_mutex_dir_key#17){++++}-{4:4}, at: open_last_lookups fs/namei.c:3804 [inline]
#1: ffff8880605bacf8 (&type->i_mutex_dir_key#17){++++}-{4:4}, at: path_openat+0x8e6/0x3840 fs/namei.c:4043
2 locks held by syz.4.276/8234:
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x216/0x360 fs/btrfs/super.c:2240
#1: ffff8880605bacf8 (&type->i_mutex_dir_key#17){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:885 [inline]
#1: ffff8880605bacf8 (&type->i_mutex_dir_key#17){++++}-{4:4}, at: lookup_slow+0x46/0x70 fs/namei.c:1824
2 locks held by syz.4.276/8237:
#0: ffff88805794e488 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff8880605bacf8 (&type->i_mutex_dir_key#17){++++}-{4:4}, at: inode_lock include/linux/fs.h:870 [inline]
#1: ffff8880605bacf8 (&type->i_mutex_dir_key#17){++++}-{4:4}, at: open_last_lookups fs/namei.c:3804 [inline]
#1: ffff8880605bacf8 (&type->i_mutex_dir_key#17){++++}-{4:4}, at: path_openat+0x8e6/0x3840 fs/namei.c:4043
2 locks held by syz.4.276/8238:
#0: ffff88805794e488 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff8880605bacf8 (&type->i_mutex_dir_key#17/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:915 [inline]
#1: ffff8880605bacf8 (&type->i_mutex_dir_key#17/1){+.+.}-{4:4}, at: filename_create+0x1f8/0x3c0 fs/namei.c:4139
2 locks held by syz.4.276/8239:
#0: ffff88805794e488 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff8880605bacf8 (&type->i_mutex_dir_key#17/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:915 [inline]
#1: ffff8880605bacf8 (&type->i_mutex_dir_key#17/1){+.+.}-{4:4}, at: filename_create+0x1f8/0x3c0 fs/namei.c:4139
1 lock held by syz.0.283/8277:
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1850 [inline]
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_subvol fs/btrfs/super.c:2080 [inline]
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x408/0x1820 fs/btrfs/super.c:2114
1 lock held by syz.7.191/8455:
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1850 [inline]
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_subvol fs/btrfs/super.c:2080 [inline]
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x408/0x1820 fs/btrfs/super.c:2114
1 lock held by udevd/8495:
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x111/0x360 fs/btrfs/super.c:2258
1 lock held by udevd/8707:
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x111/0x360 fs/btrfs/super.c:2258
1 lock held by syz.9.309/8728:
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1850 [inline]
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_subvol fs/btrfs/super.c:2080 [inline]
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x408/0x1820 fs/btrfs/super.c:2114
1 lock held by syz.8.316/8801:
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1850 [inline]
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_subvol fs/btrfs/super.c:2080 [inline]
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x408/0x1820 fs/btrfs/super.c:2114
1 lock held by syz.1.332/9030:
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1850 [inline]
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_subvol fs/btrfs/super.c:2080 [inline]
#0: ffffffff8df4a058 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x408/0x1820 fs/btrfs/super.c:2114
7 locks held by udevd/9087:
2 locks held by syz.3.338/9141:
5 locks held by syz.5.339/9133:
1 lock held by syz-executor/9145:
2 locks held by syz.4.324/9148:
5 locks held by dhcpcd-run-hook/9149:
3 locks held by syz.2.341/9151:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 39 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
watchdog+0xf93/0xfe0 kernel/hung_task.c:491
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 17 Comm: pr/legacy Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:rdtsc_ordered arch/x86/include/asm/tsc.h:57 [inline]
RIP: 0010:delay_tsc+0x71/0xc0 arch/x86/lib/delay.c:72
Code: 00 00 e8 82 f0 99 f6 65 8b 05 ab 61 00 07 85 c0 74 1c f3 90 bf 01 00 00 00 e8 bb ee 99 f6 e8 46 3c 01 00 39 c5 75 0e 0f 01 f9 <66> 90 eb bd e8 66 98 3d f6 eb dd 4c 29 fb e8 2c 3c 01 00 89 c5 0f
RSP: 0018:ffffc90000167890 EFLAGS: 00000246
RAX: 00000000d9bed558 RBX: 0000000000000899 RCX: 0000000000000000
RDX: 00000000000000ed RSI: ffffffff8b621660 RDI: ffffffff8b621620
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff8af5de30 R12: 1ffffffff3275d16
R13: 00000000ffffffff R14: 000000edd9beceab R15: 00000000000005de
FS: 0000000000000000(0000) GS:ffff8881268bc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6728809000 CR3: 000000003c51c000 CR4: 00000000003526f0
Call Trace:
udelay include/asm-generic/delay.h:62 [inline]
wait_for_lsr+0x166/0x2f0 drivers/tty/serial/8250/8250_port.c:1990
fifo_wait_for_lsr drivers/tty/serial/8250/8250_port.c:3288 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3311 [inline]
serial8250_console_write+0x11bd/0x1b40 drivers/tty/serial/8250/8250_port.c:3396
console_emit_next_record kernel/printk/printk.c:3118 [inline]
console_flush_all+0x695/0xcd0 kernel/printk/printk.c:3226
__console_flush_and_unlock+0xa4/0x240 kernel/printk/printk.c:3285
legacy_kthread_func+0x13b/0x1a0 kernel/printk/printk.c:3638
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245