INFO: task hung in user_get_super (2)

Status: upstream: reported C repro on 2023/11/19 11:27
Subsystems: fs
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+ba09f4a317431df6cddf@syzkaller.appspotmail.com
First crash: 1310d, last: 16d
Cause bisection: failed (error log, bisect log)
  
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
d4630b46 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ INFO: task hung in user_get_super (2) 2026/06/01 02:38 2026/06/01 02:38 2026/06/01 03:38 6b4a8443
3c12f68b assessment-security 💥 INFO: task hung in user_get_super (2) 2026/05/15 10:07 2026/05/15 10:07 2026/05/15 10:08 9cd3beaa
▶ ▼ Discussions (11)
Title Replies (including bot) Last reply
[syzbot] Monthly fs report (Oct 2026) 0 (1) 2026/10/12 12:33
[syzbot] Monthly fs report (Sep 2026) 1 (2) 2026/09/17 10:18
[syzbot] Monthly fs report (Aug 2026) 0 (1) 2026/08/11 04:32
[syzbot] Monthly fs report (Jul 2026) 0 (1) 2026/07/10 20:32
[syzbot] Monthly fs report (Jun 2026) 0 (1) 2026/06/09 20:32
[syzbot] Monthly fs report (Jul 2024) 0 (1) 2024/07/18 07:59
[syzbot] Monthly fs report (Mar 2024) 0 (1) 2024/03/16 12:09
[syzbot] Monthly fs report (Feb 2024) 0 (1) 2024/02/12 21:31
[syzbot] Monthly fs report (Dec 2023) 0 (1) 2023/12/12 22:02
[syzbot] Test 0 (1) 2023/11/19 12:31
[syzbot] [fs?] INFO: task hung in user_get_super (2) 0 (1) 2023/11/19 11:27
▶ ▼ Similar bugs (7)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: task hung in user_get_super 1 2 1300d 1307d 0/3 auto-obsoleted due to no activity on 2023/08/15 03:00
linux-5.15 INFO: task hung in user_get_super 1 6 1117d 1295d 0/3 auto-obsoleted due to no activity on 2024/01/25 03:23
linux-5.15 INFO: task hung in user_get_super (2) 1 1 952d 952d 0/3 auto-obsoleted due to no activity on 2024/07/08 17:00
linux-5.15 INFO: task hung in user_get_super (4) origin:lts-only 1 syz, C done 5 6d13h 539d 0/3 upstream: reported C repro on 2025/05/17 12:04
linux-6.1 INFO: task hung in user_get_super (2) origin:lts-only 1 syz, C inconclusive 28 296d 1083d 0/3 upstream: reported C repro on 2023/11/20 11:19
upstream INFO: task hung in user_get_super fs 1 1 1409d 1409d 0/29 auto-obsoleted due to no activity on 2023/04/06 01:17
linux-5.15 INFO: task hung in user_get_super (3) 1 9 795d 840d 0/3 auto-obsoleted due to no activity on 2024/12/12 06:40
▶ ▼ Last patch testing requests (4)
Created Duration User Patch Repo Result
2025/09/18 07:15 21m retest repro upstream no crash log
2025/06/07 21:03 16m retest repro upstream report log
2024/11/20 16:04 29m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci no crash log
2023/11/19 12:31 20m tintinm2017@gmail.com https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master report log

Sample crash report:
INFO: task syz.0.491:13961 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.491       state:D stack:27584 pid:13961 tgid:13940 ppid:12245  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7724
 rt_mutex_slowlock_block kernel/locking/rtmutex.c:1670 [inline]
 __rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
 __rt_mutex_slowlock_locked+0x1f86/0x25f0 kernel/locking/rtmutex.c:1787
 __rwbase_read_lock+0xc3/0x190 kernel/locking/rwbase_rt.c:114
 rwbase_read_lock kernel/locking/rwbase_rt.c:147 [inline]
 __down_read kernel/locking/rwsem.c:1502 [inline]
 down_read+0x12d/0x200 kernel/locking/rwsem.c:1576
 __super_lock fs/super.c:62 [inline]
 super_lock+0x2d1/0x3d0 fs/super.c:124
 user_get_super+0x57/0x110 fs/super.c:1050
 quotactl_block fs/quota/quota.c:889 [inline]
 __do_sys_quotactl fs/quota/quota.c:955 [inline]
 __se_sys_quotactl+0x538/0x9a0 fs/quota/quota.c:917
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8b7116f559
RSP: 002b:00007f8b6f3a5028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f8b713f6090 RCX: 00007f8b7116f559
RDX: 0000000000000000 RSI: 00002000000084c0 RDI: ffffffff80000500
RBP: 00007f8b71206b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000008500 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8b713f6128 R14: 00007f8b713f6090 R15: 00007ffc4d4dab58
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/38: 1, last CPU#0:
 #0: ffffffff8f3bfd40 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8f3bfd40 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8f3bfd40 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by kworker/u8:5/70: 6, on CPU#0:
 #0: ffff88801bef0938 ((wq_completion)netns){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff88801bef0938 ((wq_completion)netns){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff88801bef0938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #0: ffff88801bef0938 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #1: ffffc9000155fc40 (net_cleanup_work){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc9000155fc40 (net_cleanup_work){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc9000155fc40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #1: ffffc9000155fc40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #2: ffffffff907c8e00 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf5/0x810 net/core/net_namespace.c:677
 #3: ffff88806273b160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline]
 #3: ffff88806273b160 (&dev->mutex){....}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:124 [inline]
 #3: ffff88806273b160 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x129/0x420 net/devlink/core.c:581
 #4: ffff888034330310 (&devlink->lock_key#73){+.+.}-{4:4}, at: devl_lock net/devlink/core.c:314 [inline]
 #4: ffff888034330310 (&devlink->lock_key#73){+.+.}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:125 [inline]
 #4: ffff888034330310 (&devlink->lock_key#73){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x142/0x420 net/devlink/core.c:581
 #5: ffffffff907d7638 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:134 [inline]
 #5: ffffffff907d7638 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_dev_lock+0x257/0x2f0 net/core/dev.c:2188
locks held by getty/5349: 2, on CPU#1:
 #0: ffff8880379220a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900044eb2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
locks held by syz-executor/5594: 4, last CPU#0:
 #0: ffff888062ec40e0 (&type->s_umount_key#66){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
 #0: ffff888062ec40e0 (&type->s_umount_key#66){++++}-{4:4}, at: __super_lock_excl fs/super.c:75 [inline]
 #0: ffff888062ec40e0 (&type->s_umount_key#66){++++}-{4:4}, at: deactivate_super+0xac/0xe0 fs/super.c:613
 #1: ffff888034224350 (&sbi->cp_global_sem_key){+.+.}-{4:4}, at: f2fs_down_write fs/f2fs/f2fs.h:2469 [inline]
 #1: ffff888034224350 (&sbi->cp_global_sem_key){+.+.}-{4:4}, at: f2fs_down_write_trace+0x34/0x1f0 fs/f2fs/checkpoint.c:181
 #2: ffff888034225100 (&sbi->inode_lock[i]){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
 #2: ffff888034225100 (&sbi->inode_lock[i]){+.+.}-{3:3}, at: f2fs_sync_inode_meta fs/f2fs/checkpoint.c:1451 [inline]
 #2: ffff888034225100 (&sbi->inode_lock[i]){+.+.}-{3:3}, at: block_operations fs/f2fs/checkpoint.c:1572 [inline]
 #2: ffff888034225100 (&sbi->inode_lock[i]){+.+.}-{3:3}, at: f2fs_write_checkpoint+0xb93/0x2710 fs/f2fs/checkpoint.c:1987
 #3: ffffffff8f3bfd40 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #3: ffffffff8f3bfd40 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #3: ffffffff8f3bfd40 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
 #3: ffffffff8f3bfd40 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e2/0x400 kernel/locking/spinlock_rt.c:57
locks held by kworker/1:7/8368: 3, on CPU#1:
 #0: ffff88813ff6b938 ((wq_completion)events){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff88813ff6b938 ((wq_completion)events){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff88813ff6b938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #0: ffff88813ff6b938 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #1: ffffc90005237c40 (deferred_process_work){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc90005237c40 (deferred_process_work){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc90005237c40 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #1: ffffc90005237c40 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #2: ffffffff907d7638 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104
locks held by syz.0.491/13961: 1, on CPU#0:
 #0: ffff888062ec40e0 (&type->s_umount_key#66){++++}-{4:4}, at: __super_lock fs/super.c:62 [inline]
 #0: ffff888062ec40e0 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x2d1/0x3d0 fs/super.c:124
locks held by kworker/u8:6/14902: 3, on CPU#0:
 #0: ffff88813fe2c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff88813fe2c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff88813fe2c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #0: ffff88813fe2c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #1: ffffc90005587c40 ((linkwatch_work).work){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc90005587c40 ((linkwatch_work).work){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc90005587c40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #1: ffffc90005587c40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #2: ffffffff907d7638 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:313
locks held by syz-executor/15262: 7, on CPU#0:
 #0: ffff888036b90510 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2758 [inline]
 #0: ffff888036b90510 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x231/0xbb0 fs/read_write.c:683
 #1: ffff888031744c78 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d9/0x540 fs/kernfs/file.c:336
 #2: ffff88802b3434b8 (kn->active#51){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:73 [inline]
 #2: ffff88802b3434b8 (kn->active#51){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22c/0x540 fs/kernfs/file.c:337
 #3: ffffffff90047778 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd6/0x370 drivers/net/netdevsim/bus.c:234
 #4: ffff88802d3a6160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline]
 #4: ffff88802d3a6160 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1171 [inline]
 #4: ffff88802d3a6160 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb9/0x880 drivers/base/dd.c:1369
 #5: ffff88803dc44310 (&devlink->lock_key#50){+.+.}-{4:4}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1724
 #6: ffffffff8f3c6270 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x175/0x610 kernel/rcu/tree.c:4002
locks held by syz-executor/15376: 2, last CPU#1:
 #0: ffffffff8ff36b08 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8ff36b08 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ff36b08 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250 net/core/rtnetlink.c:595
 #1: ffffffff907d7638 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
 #1: ffffffff907d7638 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:366 [inline]
 #1: ffffffff907d7638 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xc10/0x1c30 net/core/rtnetlink.c:4219
locks held by syz-executor/15425: 2, on CPU#1:
 #0: ffffffff8ff36b08 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8ff36b08 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ff36b08 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250 net/core/rtnetlink.c:595
 #1: ffffffff907d7638 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
 #1: ffffffff907d7638 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:366 [inline]
 #1: ffffffff907d7638 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xc10/0x1c30 net/core/rtnetlink.c:4219
locks held by syz-executor/15469: 2, on CPU#1:
 #0: ffffffff90d26638 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff90d26638 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff90d26638 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250 net/core/rtnetlink.c:595
 #1: ffffffff907d7638 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
 #1: ffffffff907d7638 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:366 [inline]
 #1: ffffffff907d7638 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xc10/0x1c30 net/core/rtnetlink.c:4219
locks held by syz.9.617/15666: 3, last CPU#1:
 #0: ffff88801bef8510 (sb_writers#5){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2758 [inline]
 #0: ffff88801bef8510 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x231/0xbb0 fs/read_write.c:683
 #1: ffff8880724b1a10 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #1: ffff8880724b1a10 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: shmem_file_write_iter+0x82/0x120 mm/shmem.c:3433
 #2: ffffffff8f3bfd40 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #2: ffffffff8f3bfd40 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #2: ffffffff8f3bfd40 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
 #2: ffffffff8f3bfd40 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e2/0x400 kernel/locking/spinlock_rt.c:57
locks held by rm/15667: 1, last CPU#0:
 #0: ffff888054f2ebb8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:544 [inline]
 #0: ffff888054f2ebb8 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x2d8/0x9f0 mm/mmap.c:1323

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
 nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
 trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x135/0x170 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xfd2/0x1030 kernel/hung_task.c:561
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 15469 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:memset_orig+0x52/0xb0 arch/x86/lib/memset_64.S:77
Code: 0f 1f 84 00 00 00 00 00 48 ff c9 48 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 <48> 8d 7f 40 75 d8 0f 1f 84 00 00 00 00 00 89 d1 83 e1 38 74 14 c1
RSP: 0018:ffffc900046569e8 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 0000000000002800 RCX: 0000000000000005
RDX: 0000000000000200 RSI: 0000000000000000 RDI: ffffc90004656a70
RBP: ffffc90004656c20 R08: ffffffff90d24abf R09: 0000000000000000
R10: ffffc900046569f0 R11: fffffbfff21a4958 R12: ffff888034c6c2c0
R13: ffffffff8b5b9d88 R14: ffff888034c6c508 R15: ffffc900046569f0
FS:  00005555667d2500(0000) GS:ffff8881248a6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b9c613d950 CR3: 000000005d2fc000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kasan_save_stack mm/kasan/common.c:54 [inline]
 kasan_save_track+0x2f/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:351 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:377
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4683 [inline]
 slab_alloc_node mm/slub.c:4996 [inline]
 kmem_cache_alloc_lru_noprof+0x358/0x680 mm/slub.c:5029
 xas_alloc lib/xarray.c:378 [inline]
 xas_create+0x1188/0x1be0 lib/xarray.c:685
 xas_store+0x99/0x17f0 lib/xarray.c:795
 __xa_store+0xe9/0x210 lib/xarray.c:1706
 xa_store_irq include/linux/xarray.h:623 [inline]
 ref_tracker_dir_debugfs+0x256/0x360 lib/ref_tracker.c:446
 ref_tracker_dir_init include/linux/ref_tracker.h:70 [inline]
 alloc_netdev_mqs+0x27a/0x12c0 net/core/dev.c:12170
 rtnl_create_link+0x321/0xd70 net/core/rtnetlink.c:3782
 rtnl_newlink_create+0x258/0x7b0 net/core/rtnetlink.c:3964
 __rtnl_newlink net/core/rtnetlink.c:4103 [inline]
 rtnl_newlink+0x166d/0x1c30 net/core/rtnetlink.c:4220
 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7137
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2579
 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline]
 netlink_unicast+0x90c/0xac0 net/netlink/af_netlink.c:1364
 netlink_sendmsg+0x7f0/0xb20 net/netlink/af_netlink.c:1923
 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800
 __sock_sendmsg net/socket.c:815 [inline]
 __sys_sendto+0x41e/0x5d0 net/socket.c:2281
 __do_sys_sendto net/socket.c:2288 [inline]
 __se_sys_sendto net/socket.c:2284 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2284
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f272ed0fd8e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007ffffff1d3f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00005555667d2500 RCX: 00007f272ed0fd8e
RDX: 000000000000004c RSI: 00007f272fb04670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffffff1d474 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f272fb04670 R15: 0000000000000000
 </TASK>

Crashes (2040):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/22 13:54 upstream 7be4bc52fd9e b55fad29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/10/20 01:40 upstream c03c1a14507d 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/10/07 19:24 upstream 602042bf29f6 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/10/04 01:03 upstream a74306e2e676 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/09/30 12:32 upstream 551c722f4080 7808aef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/09/26 00:39 upstream aa98230e410f f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/09/19 13:59 upstream c3d85c669d09 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in user_get_super
2026/09/06 15:05 upstream 9f0346dcbea3 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/08/14 21:35 upstream 2f1baf1fc892 6f9b3e89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/08/12 05:52 upstream f5bbbfec59b4 f8d35649 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/08/08 20:31 upstream a7c7074b58d2 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/07/18 12:10 upstream 94515f3a7d42 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/07/12 19:58 upstream 44696aa3a489 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in user_get_super
2026/07/07 09:00 upstream 0e35b9b6ec0f 8e71ce95 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/27 14:15 upstream 5a66900afbd6 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in user_get_super
2026/06/27 05:29 upstream 51cb1aa1250c fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in user_get_super
2026/06/26 14:42 upstream 4edcdefd4083 7ff32d8b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in user_get_super
2026/06/26 14:41 upstream 4edcdefd4083 7ff32d8b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in user_get_super
2026/06/26 13:00 upstream 4edcdefd4083 7ff32d8b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/26 01:13 upstream a142da0b2d32 7ff32d8b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/25 20:12 upstream a142da0b2d32 7ff32d8b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/25 06:38 upstream ab9de95c9cf9 cfa969bf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/24 10:48 upstream 558ef39aeb9a 042555ff .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/24 09:20 upstream 558ef39aeb9a 042555ff .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/24 08:01 upstream 558ef39aeb9a 042555ff .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/24 06:59 upstream 558ef39aeb9a 042555ff .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/24 05:57 upstream 558ef39aeb9a 042555ff .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/24 03:55 upstream 558ef39aeb9a 042555ff .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/24 02:28 upstream f31c00c377cc 042555ff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in user_get_super
2026/06/24 01:18 upstream 558ef39aeb9a 042555ff .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/23 21:33 upstream 502d801f0ab0 4b1d8f01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/23 20:09 upstream 502d801f0ab0 4b1d8f01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/23 19:06 upstream 502d801f0ab0 4b1d8f01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/23 17:59 upstream 502d801f0ab0 4b1d8f01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/23 15:27 upstream 502d801f0ab0 4b1d8f01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/23 14:17 upstream 502d801f0ab0 4b1d8f01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/23 12:57 upstream 502d801f0ab0 4b1d8f01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/23 11:46 upstream 502d801f0ab0 4b1d8f01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/23 10:13 upstream 502d801f0ab0 5a630be6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/23 09:36 upstream 502d801f0ab0 5a630be6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/23 08:34 upstream 502d801f0ab0 5a630be6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/23 06:47 upstream 1dc18801be29 5a630be6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/23 04:33 upstream 1dc18801be29 5a630be6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/23 03:35 upstream 1dc18801be29 5a630be6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/23 01:20 upstream 1dc18801be29 5a630be6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/22 23:32 upstream 1dc18801be29 5a630be6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/22 21:46 upstream 1dc18801be29 5a630be6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/22 19:23 upstream 1dc18801be29 5a630be6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/22 16:15 upstream ef0c9f75a195 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/06/22 13:02 upstream ef0c9f75a195 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/05/25 20:00 upstream e7ae89a0c97c c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/05/15 04:41 upstream 66182ca873a4 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2025/04/24 15:38 upstream a79be02bba5c 9882047a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs INFO: task hung in user_get_super
2024/11/06 13:07 upstream 2e1b3cc9d7f7 3a465482 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in user_get_super
2024/05/25 04:34 upstream 0b32d436c015 a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in user_get_super
2023/06/13 10:32 upstream fb054096aea0 749afb64 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2023/06/11 14:39 upstream 022ce8862dff 7086cdb9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in user_get_super
2023/05/30 13:15 upstream 8b817fded42d cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in user_get_super
2026/08/09 14:11 linux-next 6b8c8af514d7 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in user_get_super
2026/08/09 05:26 linux-next 6b8c8af514d7 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in user_get_super
2025/07/12 07:48 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ec4801305969 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in user_get_super
2023/11/19 11:26 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8de1e7afcc1c cb976f63 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 INFO: task hung in user_get_super
* Struck through repros no longer work on HEAD.