INFO: task hung in vfs_setxattr (8)

Status: auto-obsoleted due to no activity on 2026/09/05 07:46
Subsystems: ext4
Labels: prio:high
[Documentation on labels]
First crash: 63d, last: 63d
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
5efc7f86 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ✅ VMHostTrigger: ❌ ❓ INFO: task hung in vfs_setxattr (8) 2026/07/09 00:04 2026/07/09 00:04 2026/07/09 00:55 93f57954
▶ ▼ Similar bugs (16)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in vfs_setxattr (2) fs 1 1 2293d 2293d 0/29 auto-closed as invalid on 2020/07/28 17:13
linux-5.15 INFO: task hung in vfs_setxattr (2) 1 syz error 1 1098d 1098d 0/3 auto-obsoleted due to no activity on 2023/12/15 17:11
upstream INFO: task hung in vfs_setxattr (6) ext4 xfs 1 8 612d 704d 0/29 auto-obsoleted due to no activity on 2025/04/04 18:48
upstream INFO: task hung in vfs_setxattr (5) fs 1 1 813d 813d 0/29 auto-obsoleted due to no activity on 2024/09/15 03:42
android-49 INFO: task hung in vfs_setxattr 1 4 2949d 2976d 0/3 auto-closed as invalid on 2019/02/22 13:09
linux-5.15 INFO: task hung in vfs_setxattr (3) 1 1 863d 863d 0/3 auto-obsoleted due to no activity on 2024/08/06 16:46
upstream INFO: task hung in vfs_setxattr (3) fs 1 syz done error 49 1766d 2184d 0/29 closed as invalid on 2022/02/08 10:51
upstream INFO: task hung in vfs_setxattr fs 1 46 2822d 2983d 0/29 auto-closed as invalid on 2019/06/15 01:37
linux-4.19 INFO: task hung in vfs_setxattr (2) 1 syz, C error 3 1796d 2076d 0/1 upstream: reported C repro on 2021/01/01 10:53
android-414 INFO: task hung in vfs_setxattr 1 1 2699d 2699d 0/1 auto-closed as invalid on 2019/10/16 16:43
linux-5.15 INFO: task hung in vfs_setxattr 1 1 1249d 1249d 0/3 auto-obsoleted due to no activity on 2023/08/06 19:50
upstream INFO: task hung in vfs_setxattr (7) prio:normal xfs 1 syz error done 62 155d 460d 0/29 auto-obsoleted due to no activity on 2026/06/19 13:37
upstream INFO: task hung in vfs_setxattr (4) ext4 1 1 1162d 1162d 0/29 auto-obsoleted due to no activity on 2023/10/02 09:30
linux-4.19 INFO: task hung in vfs_setxattr 1 3 2495d 2557d 0/1 auto-closed as invalid on 2020/03/08 20:30
android-6-12 INFO: task hung in vfs_setxattr 1 1 419d 419d 0/1 auto-obsoleted due to no activity on 2025/10/14 10:59
android-44 INFO: task hung in vfs_setxattr 1 syz, C 3 2574d 2579d 0/2 public: reported C repro on 2019/08/17 15:36

Sample crash report:
INFO: task syz.9.1272:13060 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.1272      state:D stack:27192 pid:13060 tgid:13054 ppid:9510   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x1709/0x5530 kernel/sched/core.c:7231
 __schedule_loop kernel/sched/core.c:7308 [inline]
 rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7604
 rt_mutex_slowlock_block kernel/locking/rtmutex.c:1670 [inline]
 __rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
 __rt_mutex_slowlock_locked+0x1f84/0x25b0 kernel/locking/rtmutex.c:1787
 rt_mutex_slowlock+0xbd/0x170 kernel/locking/rtmutex.c:1827
 __rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline]
 rwbase_write_lock+0x14c/0x720 kernel/locking/rwbase_rt.c:251
 inode_lock include/linux/fs.h:1024 [inline]
 vfs_setxattr+0x13e/0x360 fs/xattr.c:343
 do_setxattr fs/xattr.c:662 [inline]
 filename_setxattr+0x296/0x630 fs/xattr.c:690
 path_setxattrat+0x408/0x450 fs/xattr.c:734
 __do_sys_setxattr fs/xattr.c:768 [inline]
 __se_sys_setxattr fs/xattr.c:764 [inline]
 __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:764
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8425eade59
RSP: 002b:00007f84240e5028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f8426136090 RCX: 00007f8425eade59
RDX: 0000200000000000 RSI: 0000200000000100 RDI: 0000200000000080
RBP: 00007f8425f43e6f R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000835 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8426136128 R14: 00007f8426136090 R15: 00007ffe4d147d68
 </TASK>
INFO: task syz.9.1272:13063 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.1272      state:D stack:25752 pid:13063 tgid:13054 ppid:9510   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x1709/0x5530 kernel/sched/core.c:7231
 __schedule_loop kernel/sched/core.c:7308 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7323
 mb_cache_entry_wait_unused+0x17d/0x280 fs/mbcache.c:148
 ext4_evict_ea_inode+0x14d/0x2f0 fs/ext4/xattr.c:481
 ext4_evict_inode+0x169/0x10c0 fs/ext4/inode.c:187
 evict+0x624/0xb50 fs/inode.c:822
 ext4_xattr_ibody_set+0x569/0x710 fs/ext4/xattr.c:2288
 ext4_xattr_set_handle+0xd44/0x1540 fs/ext4/xattr.c:2447
 ext4_xattr_set+0x257/0x340 fs/ext4/xattr.c:2561
 __vfs_setxattr+0x442/0x480 fs/xattr.c:223
 __vfs_setxattr_noperm+0x12a/0x660 fs/xattr.c:257
 vfs_setxattr+0x163/0x360 fs/xattr.c:344
 do_setxattr fs/xattr.c:662 [inline]
 filename_setxattr+0x296/0x630 fs/xattr.c:690
 path_setxattrat+0x408/0x450 fs/xattr.c:734
 __do_sys_setxattr fs/xattr.c:768 [inline]
 __se_sys_setxattr fs/xattr.c:764 [inline]
 __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:764
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8425eade59
RSP: 002b:00007f84240c4028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f8426136180 RCX: 00007f8425eade59
RDX: 0000200000001400 RSI: 00002000000001c0 RDI: 0000200000000380
RBP: 00007f8425f43e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000[ 1278.125927][   T40] R10: 0000000000000835 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8426136218 R14: 00007f8426136180 R15: 00007ffe4d147d68
 </TASK>
INFO: task syz.9.1272:13064 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.1272      state:D stack:24864 pid:13064 tgid:13054 ppid:9510   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x1709/0x5530 kernel/sched/core.c:7231
 __schedule_loop kernel/sched/core.c:7308 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7323
 __wait_on_freeing_inode+0x166/0x3b0 fs/inode.c:2616
 find_inode_fast+0x3e0/0x740 fs/inode.c:1095
 iget_locked+0xd0/0x6a0 fs/inode.c:1461
 __ext4_iget+0x242/0x45b0 fs/ext4/inode.c:5301
 ext4_xattr_inode_cache_find fs/ext4/xattr.c:1552 [inline]
 ext4_xattr_inode_lookup_create+0x492/0x1d20 fs/ext4/xattr.c:1591
 ext4_xattr_block_set+0x220/0x2a80 fs/ext4/xattr.c:1920
 ext4_xattr_move_to_block fs/ext4/xattr.c:2671 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2746 [inline]
 ext4_expand_extra_isize_ea+0x1342/0x1e70 fs/ext4/xattr.c:2834
 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6486
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6529 [inline]
 __ext4_mark_inode_dirty+0x455/0x700 fs/ext4/inode.c:6607
 ext4_setattr+0x1766/0x1d70 fs/ext4/inode.c:6121
 notify_change+0xbb8/0xec0 fs/attr.c:556
 do_truncate+0x1c2/0x250 fs/open.c:68
 handle_truncate fs/namei.c:4300 [inline]
 do_open fs/namei.c:4698 [inline]
 path_openat+0x300d/0x3850 fs/namei.c:4857
 do_file_open+0x23e/0x4a0 fs/namei.c:4886
 do_sys_openat2+0x115/0x200 fs/open.c:1368
 do_sys_open fs/open.c:1374 [inline]
 __do_sys_creat fs/open.c:1452 [inline]
 __se_sys_creat fs/open.c:1446 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1446
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8425eade59
RSP: 002b:00007f8423ca1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f8426136270 RCX: 00007f8425eade59
RDX: 0000000000000000 RSI: 0000000000000020 RDI: 0000200000000240
RBP: 00007f8425f43e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8426136308 R14: 00007f8426136270 R15: 00007ffe4d147d68
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/0:0/9:
 #0: ffff88813fe1a538 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffff88813fe1a538 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #0: ffff88813fe1a538 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
 #1: ffffc900000e7c60 ((gc_work).work){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #1: ffffc900000e7c60 ((gc_work).work){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #1: ffffc900000e7c60 ((gc_work).work){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
 #2: ffffffff8eced418 ("ratelimiter_table_lock"){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
 #2: ffffffff8eced418 ("ratelimiter_table_lock"){+.+.}-{3:3}, at: wg_ratelimiter_gc_entries+0x5d/0x470 drivers/net/wireguard/ratelimiter.c:63
4 locks held by pr/legacy/17:
 #0: ffffffff8e1b5a00 (console_lock){+.+.}-{0:0}, at: legacy_kthread_func+0x1a3/0x250 kernel/printk/printk.c:3711
 #1: ffffffff8e09d2f8 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:305 [inline]
 #1: ffffffff8e09d2f8 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:428 [inline]
 #1: ffffffff8e09d2f8 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:291 [inline]
 #1: ffffffff8e09d2f8 (console_srcu){....}-{0:0}, at: console_flush_one_record+0xfa/0xb50 kernel/printk/printk.c:3246
 #2: ffffffff99e3c498 (&port_lock_key){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
 #2: ffffffff99e3c498 (&port_lock_key){+.+.}-{3:3}, at: uart_port_lock_irqsave include/linux/serial_core.h:719 [inline]
 #2: ffffffff99e3c498 (&port_lock_key){+.+.}-{3:3}, at: serial8250_console_write+0x17c/0x1b40 drivers/tty/serial/8250/8250_port.c:3338
 #3: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #3: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #3: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
 #3: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400 kernel/locking/spinlock_rt.c:57
1 lock held by khungtaskd/40:
 #0: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #0: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6821
6 locks held by kworker/u8:15/2176:
 #0: ffff88801bea0938 ((wq_completion)netns){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffff88801bea0938 ((wq_completion)netns){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #0: ffff88801bea0938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
 #1: ffffc9000811fc60 (net_cleanup_work){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #1: ffffc9000811fc60 (net_cleanup_work){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #1: ffffc9000811fc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
 #2: ffffffff8f59de00 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf5/0x810 net/core/net_namespace.c:673
 #3: ffff888038fbd160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline]
 #3: ffff888038fbd160 (&dev->mutex){....}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:124 [inline]
 #3: ffff888038fbd160 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x129/0x420 net/devlink/core.c:557
 #4: ffff88803fb1a310 (&devlink->lock_key#28){+.+.}-{4:4}, at: devl_lock net/devlink/core.c:292 [inline]
 #4: ffff88803fb1a310 (&devlink->lock_key#28){+.+.}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:125 [inline]
 #4: ffff88803fb1a310 (&devlink->lock_key#28){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x142/0x420 net/devlink/core.c:557
 #5: ffffffff8f5ad138 (rtnl_mutex){+.+.}-{4:4}, at: unregister_nexthop_notifier+0x17/0x40 net/ipv4/nexthop.c:4045
5 locks held by kworker/u8:17/4316:
 #0: ffff888033960138 ((wq_completion)bat_events){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffff888033960138 ((wq_completion)bat_events){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #0: ffff888033960138 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
 #1: ffffc90010cdfc60 ((work_completion)(&(&bat_priv->tt.work)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #1: ffffc90010cdfc60 ((work_completion)(&(&bat_priv->tt.work)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #1: ffffc90010cdfc60 ((work_completion)(&(&bat_priv->tt.work)->work)){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
 #2: ffffffff8e059360 (local_bh){.+.+}-{1:3}, at: __local_bh_disable_ip+0x3c/0x420 kernel/softirq.c:163
 #3: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: __local_bh_disable_ip+0x3c/0x420 kernel/softirq.c:163
 #4: ffff888059b3a058 (key#18){+...}-{3:3}, at: spin_lock_bh include/linux/spinlock_rt.h:90 [inline]
 #4: ffff888059b3a058 (key#18){+...}-{3:3}, at: batadv_tt_global_purge net/batman-adv/translation-table.c:2281 [inline]
 #4: ffff888059b3a058 (key#18){+...}-{3:3}, at: batadv_tt_purge+0x137/0x9f0 net/batman-adv/translation-table.c:3566
2 locks held by klogd/4950:
 #0: ffff888036740908 (&u->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
 #0: ffff888036740908 (&u->lock){+.+.}-{3:3}, at: unix_peer_get+0x21/0xe0 net/unix/af_unix.c:297
 #1: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #1: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #1: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
 #1: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400 kernel/locking/spinlock_rt.c:57
3 locks held by udevd/4961:
 #0: ffffffff8e296c70 (dup_mmap_sem){++++}-{0:0}, at: dup_mm kernel/fork.c:1541 [inline]
 #0: ffffffff8e296c70 (dup_mmap_sem){++++}-{0:0}, at: copy_mm+0x10f/0x480 kernel/fork.c:1594
 #1: ffff888037ace2b0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:554 [inline]
 #1: ffff888037ace2b0 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x16e/0x1d40 mm/mmap.c:1739
 #2: ffff8880400011b0 (&mm->mmap_lock/1){+.+.}-{4:4}, at: mmap_write_lock_nested include/linux/mmap_lock.h:544 [inline]
 #2: ffff8880400011b0 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x256/0x1d40 mm/mmap.c:1746
2 locks held by getty/5348:
 #0: ffff8880370170a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90003cc62e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
2 locks held by sshd-session/5582:
 #0: ffff888029fa8358 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
 #0: ffff888029fa8358 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x21/0x50 net/ipv4/tcp.c:1450
 #1: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #1: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #1: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: __ip_queue_xmit+0x65/0x1b10 net/ipv4/ip_output.c:476
2 locks held by syz-executor/5583:
 #0: ffff888036c047b0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:592 [inline]
 #0: ffff888036c047b0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x1a4/0x9f0 mm/mmap.c:1284
 #1: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #1: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #1: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1183 [inline]
 #1: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550 arch/x86/kernel/unwind_orc.c:495
5 locks held by kworker/u8:18/7303:
 #0: ffff88813fe5c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffff88813fe5c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #0: ffff88813fe5c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
 #1: ffffc90003ebfc60 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #1: ffffc90003ebfc60 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #1: ffffc90003ebfc60 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
 #2: ffffffff8e051cb0 (cpu_hotplug_lock){++++}-{0:0}, at: static_key_enable+0x12/0x20 kernel/jump_label.c:222
 #3: ffffffff8e299238 (jump_label_mutex){+.+.}-{4:4}, at: jump_label_lock kernel/jump_label.c:27 [inline]
 #3: ffffffff8e299238 (jump_label_mutex){+.+.}-{4:4}, at: static_key_enable_cpuslocked+0xcb/0x240 kernel/jump_label.c:207
 #4: ffffffff8e0685d8 (text_mutex){+.+.}-{4:4}, at: arch_jump_label_transform_apply+0x17/0x30 arch/x86/kernel/jump_label.c:145
6 locks held by kworker/u8:20/7305:
 #0: ffff88813fe5c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffff88813fe5c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #0: ffff88813fe5c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
 #1: ffffc90002b3fc60 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #1: ffffc90002b3fc60 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #1: ffffc90002b3fc60 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
 #2: ffff88803b202310 (&devlink->lock_key#31){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x57/0xcb0 drivers/net/netdevsim/dev.c:909
 #3: ffff888060aa0520 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
 #3: ffff888060aa0520 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: nsim_dev_trap_report drivers/net/netdevsim/dev.c:862 [inline]
 #3: ffff888060aa0520 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: nsim_dev_trap_report_work+0x1e0/0xcb0 drivers/net/netdevsim/dev.c:922
 #4: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #4: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #4: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
 #4: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400 kernel/locking/spinlock_rt.c:57
 #5: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #5: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #5: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
 #5: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400 kernel/locking/spinlock_rt.c:57
3 locks held by kworker/u8:32/7320:
 #0: ffff88813fe5c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffff88813fe5c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #0: ffff88813fe5c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
 #1: ffffc9000405fc60 ((linkwatch_work).work){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #1: ffffc9000405fc60 ((linkwatch_work).work){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #1: ffffc9000405fc60 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
 #2: ffffffff8f5ad138 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:313
2 locks held by syz.9.1272/13060:
 #0: ffff888065526510 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:494
 #1: ffff88806b95b388 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #1: ffff88806b95b388 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: vfs_setxattr+0x13e/0x360 fs/xattr.c:343
3 locks held by syz.9.1272/13063:
 #0: ffff888065526510 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:494
 #1: ffff88806b958428 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #1: ffff88806b958428 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: vfs_setxattr+0x13e/0x360 fs/xattr.c:343
 #2: ffff88806b9580b8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline]
 #2: ffff88806b9580b8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_xattr_set_handle+0x194/0x1540 fs/ext4/xattr.c:2374
4 locks held by syz.9.1272/13064:
 #0: ffff888065526510 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:494
 #1: ffff88806b95b388 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: inode_lock_killable include/linux/fs.h:1029 [inline]
 #1: ffff88806b95b388 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: do_truncate+0x18f/0x250 fs/open.c:63
 #2: ffff88806b95b558 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock include/linux/fs.h:1079 [inline]
 #2: ffff88806b95b558 (mapping.invalidate_lock#2){++++}-{4:4}, at: ext4_setattr+0xfde/0x1d70 fs/ext4/inode.c:6051
 #3: ffff88806b95b018 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline]
 #3: ffff88806b95b018 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6526 [inline]
 #3: ffff88806b95b018 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x3d0/0x700 fs/ext4/inode.c:6607
1 lock held by syz-executor/13958:
 #0: ffffffff8f5ad138 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
 #0: ffffffff8f5ad138 (rtnl_mutex){+.+.}-{4:4}, at: inet6_rtm_newaddr+0x667/0xe00 net/ipv6/addrconf.c:5062
2 locks held by syz-executor/14179:
 #0: ffffffff8faf69b8 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffffffff8faf69b8 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #0: ffffffff8faf69b8 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250 net/core/rtnetlink.c:570
 #1: ffffffff8f5ad138 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
 #1: ffffffff8f5ad138 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
 #1: ffffffff8f5ad138 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a3/0x1bd0 net/core/rtnetlink.c:4158
11 locks held by syz-executor/14192:
 #0: ffff8880364b0510 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2731 [inline]
 #0: ffff8880364b0510 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x231/0xbb0 fs/read_write.c:683
 #1: ffff88803822d478 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d9/0x540 fs/kernfs/file.c:336
 #2: ffff888029e04878 (kn->active#52){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:73 [inline]
 #2: ffff888029e04878 (kn->active#52){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22c/0x540 fs/kernfs/file.c:337
 #3: ffffffff8ee217f8 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd6/0x370 drivers/net/netdevsim/bus.c:234
 #4: ffff888029c5d160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline]
 #4: ffff888029c5d160 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1171 [inline]
 #4: ffff888029c5d160 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb9/0x880 drivers/base/dd.c:1369
 #5: ffff88802cc98310 (&devlink->lock_key#29){+.+.}-{4:4}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1799
 #6: ffffffff8f5ad138 (rtnl_mutex){+.+.}-{4:4}, at: nsim_destroy+0x173/0x800 drivers/net/netdevsim/netdev.c:1191
 #7: ffff8880b863b920 (&rq->__lock){-...}-{2:2}, at: raw_spin_rq_lock_nested+0xb2/0x160 kernel/sched/core.c:675
 #8: ffff8880b8724540 (psi_seq){-...}-{0:0}, at: psi_task_switch+0x57/0x7d0 kernel/sched/psi.c:933
 #9: ffff8880b8728458 (hrtimer_bases.lock){-...}-{2:2}, at: class_raw_spinlock_constructor include/linux/spinlock.h:536 [inline]
 #9: ffff8880b8728458 (hrtimer_bases.lock){-...}-{2:2}, at: __hrtimer_rearm_deferred+0x99/0x430 kernel/time/hrtimer.c:2146
 #10: ffffffff99aca788 (&____s->seqcount#2){--..}-{0:0}, at: ktime_expiry_to_cycles+0x4e/0x1e0 kernel/time/timekeeping.c:910
1 lock held by syz-executor/14276:
 #0: ffffffff8f5ad138 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
 #0: ffffffff8f5ad138 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
 #0: ffffffff8f5ad138 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a3/0x1bd0 net/core/rtnetlink.c:4158
4 locks held by sed/14387:
 #0: ffff8880377c1f30 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:554 [inline]
 #0: ffff8880377c1f30 (&mm->mmap_lock){++++}-{4:4}, at: do_mprotect_pkey+0x260/0xcd0 mm/mprotect.c:860
 #1: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #1: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #1: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x200 mm/pgtable-generic.c:290
 #2: ffff88803dda2118 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
 #2: ffff88803dda2118 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: pte_offset_map_lock+0x13d/0x210 mm/pgtable-generic.c:404
 #3: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #3: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #3: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
 #3: ffffffff8e1c3840 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400 kernel/locking/spinlock_rt.c:57
1 lock held by syz.2.1444/14390:
 #0: ffff888065de28f0 (&u->iolock){+.+.}-{4:4}, at: rt_mutex_slowunlock+0xbe/0x460 kernel/locking/rtmutex.c:1430
1 lock held by syz.2.1444/14391:
 #0: ffffffff8f5ad138 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
 #0: ffffffff8f5ad138 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x767/0xc00 net/core/rtnetlink.c:7082

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 40 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
 nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [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+0xfd7/0x1030 kernel/hung_task.c:561
 kthread+0x388/0x470 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 14390 Comm: syz.2.1444 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:preempt_latency_start kernel/sched/core.c:5962 [inline]
RIP: 0010:preempt_count_add+0x9e/0x190 kernel/sched/core.c:5985
Code: 65 8b 05 d5 99 09 11 25 ff ff ff 7f 39 f8 75 42 48 8b 5c 24 18 48 89 df e8 6f 95 0d 00 85 c0 74 09 31 db 31 ff e8 62 95 0d 00 <65> 4c 8b 35 82 99 09 11 49 81 c6 f8 15 00 00 4c 89 f0 48 c1 e8 03
RSP: 0018:ffffc90002b0f5c8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff99a86500
RDX: 0000000000000000 RSI: ffffffff8bca6860 RDI: 0000000000000000
RBP: ffffc90002b0f6c0 R08: ffffffff8faf43f7 R09: 1ffffffff1f5e87e
R10: dffffc0000000000 R11: fffffbfff1f5e87f R12: 1ffff92000561ec9
R13: dffffc0000000000 R14: ffff888065de2240 R15: dffffc0000000000
FS:  00007f8813dd56c0(0000) GS:ffff888125c4e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2588cd CR3: 00000000657e4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:131 [inline]
 _raw_spin_lock_irqsave+0x24/0x60 kernel/locking/spinlock.c:166
 rtlock_slowlock kernel/locking/rtmutex.c:1921 [inline]
 rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
 __rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
 rt_spin_lock+0x157/0x400 kernel/locking/spinlock_rt.c:57
 spin_lock include/linux/spinlock_rt.h:45 [inline]
 __skb_try_recv_datagram+0x89/0x1b0 net/core/datagram.c:264
 __unix_dgram_recvmsg+0x2e4/0xd70 net/unix/af_unix.c:2577
 sock_recvmsg_nosec+0x130/0x170 net/socket.c:1166
 ____sys_recvmsg+0x242/0x4f0 net/socket.c:-1
 ___sys_recvmsg+0x213/0x5a0 net/socket.c:2989
 do_recvmmsg+0x320/0x7f0 net/socket.c:3084
 __sys_recvmmsg net/socket.c:3158 [inline]
 __do_sys_recvmmsg net/socket.c:3181 [inline]
 __se_sys_recvmmsg net/socket.c:3174 [inline]
 __x64_sys_recvmmsg+0x198/0x250 net/socket.c:3174
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8815b9de59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8813dd5028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f8815e26090 RCX: 00007f8815b9de59
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f8815c33e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8815e26128 R14: 00007f8815e26090 R15: 00007ffde2f44168
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/07 07:46 linux-next 8e9685d3c41c 8e71ce95 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in vfs_setxattr
* Struck through repros no longer work on HEAD.