INFO: task syz.1.56:4493 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.56 state:D stack:24208 pid:4493 ppid:4266 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
schedule+0xb9/0x180 kernel/sched/core.c:6638
mb_cache_entry_wait_unused+0x17a/0x270 fs/mbcache.c:148
ext4_evict_ea_inode+0x149/0x2f0 fs/ext4/xattr.c:441
ext4_evict_inode+0x176/0x1110 fs/ext4/inode.c:181
evict+0x4c9/0x8d0 fs/inode.c:705
ext4_xattr_ibody_set+0x509/0x690 fs/ext4/xattr.c:2228
ext4_xattr_set_handle+0xcdd/0x1570 fs/ext4/xattr.c:2387
ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2501
__vfs_setxattr+0x3e0/0x420 fs/xattr.c:182
__vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216
vfs_setxattr+0x167/0x2e0 fs/xattr.c:309
do_setxattr fs/xattr.c:594 [inline]
setxattr+0x346/0x360 fs/xattr.c:617
path_setxattr+0x147/0x290 fs/xattr.c:636
__do_sys_setxattr fs/xattr.c:652 [inline]
__se_sys_setxattr fs/xattr.c:648 [inline]
__x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:648
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4b3bf9c799
RSP: 002b:00007f4b3ce06028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f4b3c215fa0 RCX: 00007f4b3bf9c799
RDX: 0000200000001400 RSI: 0000200000000100 RDI: 0000200000000380
RBP: 00007f4b3c032bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000835 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4b3c216038 R14: 00007f4b3c215fa0 R15: 00007ffecc1d7ff8
INFO: task syz.1.56:4499 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.56 state:D stack:26000 pid:4499 ppid:4266 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
schedule+0xb9/0x180 kernel/sched/core.c:6638
__wait_on_freeing_inode fs/inode.c:2286 [inline]
find_inode_fast+0x2da/0x3f0 fs/inode.c:995
iget_locked+0xc0/0x830 fs/inode.c:1360
__ext4_iget+0x233/0x3e40 fs/ext4/inode.c:4863
ext4_xattr_inode_cache_find fs/ext4/xattr.c:1497 [inline]
ext4_xattr_inode_lookup_create+0x4cd/0x1e60 fs/ext4/xattr.c:1536
ext4_xattr_ibody_set+0x1fe/0x690 fs/ext4/xattr.c:2210
ext4_xattr_set_handle+0xcdd/0x1570 fs/ext4/xattr.c:2387
ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2501
__vfs_setxattr+0x3e0/0x420 fs/xattr.c:182
__vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216
vfs_setxattr+0x167/0x2e0 fs/xattr.c:309
do_setxattr fs/xattr.c:594 [inline]
setxattr+0x346/0x360 fs/xattr.c:617
path_setxattr+0x147/0x290 fs/xattr.c:636
__do_sys_setxattr fs/xattr.c:652 [inline]
__se_sys_setxattr fs/xattr.c:648 [inline]
__x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:648
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4b3bf9c799
RSP: 002b:00007f4b3cde5028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f4b3c216090 RCX: 00007f4b3bf9c799
RDX: 0000200000001400 RSI: 00002000000001c0 RDI: 00002000000000c0
RBP: 00007f4b3c032bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000835 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4b3c216128 R14: 00007f4b3c216090 R15: 00007ffecc1d7ff8
INFO: task syz.1.56:4502 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.56 state:D stack:28528 pid:4502 ppid:4266 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
schedule+0xb9/0x180 kernel/sched/core.c:6638
rwsem_down_write_slowpath+0xc2e/0x1110 kernel/locking/rwsem.c:1189
inode_lock include/linux/fs.h:758 [inline]
lock_two_nondirectories+0xd5/0x150 fs/inode.c:1208
vfs_rename+0x7e3/0x1100 fs/namei.c:4853
do_renameat2+0x8e5/0xce0 fs/namei.c:5035
__do_sys_rename fs/namei.c:5081 [inline]
__se_sys_rename fs/namei.c:5079 [inline]
__x64_sys_rename+0x82/0x90 fs/namei.c:5079
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4b3bf9c799
RSP: 002b:00007f4b3cda3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f4b3c216270 RCX: 00007f4b3bf9c799
RDX: 0000000000000000 RSI: 0000200000000180 RDI: 0000200000000080
RBP: 00007f4b3c032bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4b3c216308 R14: 00007f4b3c216270 R15: 00007ffecc1d7ff8
Showing all locks held in the system:
3 locks held by kworker/u4:1/11:
#0: ffff88801ea85938 ((wq_completion)cfg80211){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
#1: ffffc90000107d00 ((work_completion)(&(&rdev->dfs_update_channels_wk)->work)){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
#2: ffffffff8dd469e8 (rtnl_mutex){+.+.}-{3:3}, at: cfg80211_dfs_channels_update_work+0xc7/0x640 net/wireless/mlme.c:889
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8cb2dfb0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8cb2e7d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/27:
#0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513
3 locks held by kworker/u4:3/46:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
#1: ffffc90000b77d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
#2: ffffffff8dd469e8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:263
1 lock held by dhcpcd/3932:
#0: ffffffff8dd469e8 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x288/0x1af0 net/ipv4/devinet.c:1080
2 locks held by getty/4027:
#0: ffff88814d123098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x429/0x1390 drivers/tty/n_tty.c:2198
6 locks held by kworker/u4:6/4327:
#0: ffff888017616938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
#1: ffffc900046bfd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
#2: ffffffff8dd39b10 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x148/0xba0 net/core/net_namespace.c:594
#3: ffffffff8dd469e8 (rtnl_mutex){+.+.}-{3:3}, at: ieee80211_unregister_hw+0x51/0x290 net/mac80211/main.c:1476
#4: ffff8880302287c8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5693 [inline]
#4: ffff8880302287c8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: cfg80211_netdev_notifier_call+0x7fb/0x14f0 net/wireless/core.c:1507
#5: ffffffff8cb332f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
#5: ffffffff8cb332f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2ec/0x890 kernel/rcu/tree_exp.h:962
3 locks held by kworker/u4:7/4336:
#0: ffff8880b8f3ab18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:538
#1: ffff8880b8f27888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x398/0x6d0 kernel/sched/psi.c:999
#2: ffff8880b8f28458 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x123/0x270 kernel/time/timer.c:999
3 locks held by syz.1.56/4493:
#0: ffff888068324460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402
#1: ffff888070478400 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
#1: ffff888070478400 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: vfs_setxattr+0x140/0x2e0 fs/xattr.c:308
#2: ffff8880704780c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:158 [inline]
#2: ffff8880704780c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x18c/0x1570 fs/ext4/xattr.c:2314
3 locks held by syz.1.56/4499:
#0: ffff888068324460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402
#1: ffff8880705b8400 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
#1: ffff8880705b8400 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: vfs_setxattr+0x140/0x2e0 fs/xattr.c:308
#2: ffff8880705b80c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:158 [inline]
#2: ffff8880705b80c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x18c/0x1570 fs/ext4/xattr.c:2314
5 locks held by syz.1.56/4502:
#0: ffff888068324460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402
#1: ffff888068324748 (&type->s_vfs_rename_key#2){+.+.}-{3:3}, at: lock_rename fs/namei.c:3046 [inline]
#1: ffff888068324748 (&type->s_vfs_rename_key#2){+.+.}-{3:3}, at: do_renameat2+0x363/0xce0 fs/namei.c:4974
#2: ffff8880742ee850 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline]
#2: ffff8880742ee850 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: lock_two_directories fs/namei.c:-1 [inline]
#2: ffff8880742ee850 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: lock_rename fs/namei.c:3047 [inline]
#2: ffff8880742ee850 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_renameat2+0x3fa/0xce0 fs/namei.c:4974
#3: ffff88807437f258 (&type->i_mutex_dir_key#3/5){+.+.}-{3:3}, at: lock_rename include/linux/fs.h:-1 [inline]
#3: ffff88807437f258 (&type->i_mutex_dir_key#3/5){+.+.}-{3:3}, at: do_renameat2+0x435/0xce0 fs/namei.c:4974
#4: ffff888070478400 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
#4: ffff888070478400 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: lock_two_nondirectories+0xd5/0x150 fs/inode.c:1208
2 locks held by kworker/1:17/7316:
#0: ffff888017472138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
#1: ffffc90005047d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
1 lock held by syz-executor/7374:
#0: ffffffff8dd469e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
#0: ffffffff8dd469e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x824/0xfc0 net/core/rtnetlink.c:6147
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xeee/0xf30 kernel/hung_task.c:377
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7374 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:check_preemption_disabled+0x18/0x110 lib/smp_processor_id.c:14
Code: cc cc 48 c7 c7 00 0f df 8a 48 c7 c6 40 0f df 8a eb 00 55 41 57 41 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 <65> 8b 05 51 ff d4 75 65 8b 0d f2 54 d5 75 f7 c1 ff ff ff 7f 74 1f
RSP: 0018:ffffc900001e0610 EFLAGS: 00000082
RAX: d3aae01255aab000 RBX: 0000000000000000 RCX: ffffffff815db10e
RDX: 0000000000000000 RSI: ffffffff8adf0f40 RDI: ffffffff8adf0f00
RBP: ffff8880b8e3abc0 R08: ffffffff8e1fd76f R09: 1ffffffff1c3faed
R10: dffffc0000000000 R11: fffffbfff1c3faee R12: dffffc0000000000
R13: 0000000000000009 R14: 0000000000000001 R15: dffffc0000000000
FS: 0000555561ef4500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd81349128 CR3: 000000002e3cc000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
rcu_is_watching+0x11/0xa0 kernel/rcu/tree.c:721
trace_pelt_cfs_tp+0x5d/0x190 include/trace/events/sched.h:694
update_load_avg+0xfc5/0x1460 kernel/sched/fair.c:4206
dequeue_entity+0x94/0x1250 kernel/sched/fair.c:4866
dequeue_task_fair+0x1ad/0x1080 kernel/sched/fair.c:6198
detach_task+0x137/0x330 kernel/sched/fair.c:8418
detach_tasks kernel/sched/fair.c:8554 [inline]
load_balance+0x416d/0x57f0 kernel/sched/fair.c:10611
rebalance_domains+0x47b/0xa10 kernel/sched/fair.c:11029
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1948 [inline]
RIP: 0010:vprintk_emit+0x48b/0x6a0 kernel/printk/printk.c:2302
Code: 86 01 00 00 e8 b6 08 1b 00 41 89 df 4d 85 f6 48 8b 5c 24 08 75 07 e8 a4 08 1b 00 eb 06 e8 9d 08 1b 00 fb 48 c7 c7 c0 18 b2 8c <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 0d d2
RSP: 0018:ffffc9000c0aed00 EFLAGS: 00000293
RAX: ffffffff81676a13 RBX: ffffffff816768a5 RCX: ffff88802577bb80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8cb218c0
RBP: ffffc9000c0aedf0 R08: ffffffff90af624f R09: 1ffffffff215ec49
R10: dffffc0000000000 R11: fffffbfff215ec4a R12: dffffc0000000000
R13: 1ffff92001815da4 R14: 0000000000000200 R15: 0000000000000035
_printk+0xda/0x130 kernel/printk/printk.c:2328
batadv_hardif_enable_interface+0x584/0xa10 net/batman-adv/hard-interface.c:745
batadv_softif_slave_add+0x72/0xf0 net/batman-adv/soft-interface.c:842
do_set_master net/core/rtnetlink.c:2630 [inline]
do_setlink+0xd3a/0x3e60 net/core/rtnetlink.c:2840
__rtnl_newlink net/core/rtnetlink.c:3608 [inline]
rtnl_newlink+0x177c/0x2080 net/core/rtnetlink.c:3655
rtnetlink_rcv_msg+0x87c/0xfc0 net/core/rtnetlink.c:6150
netlink_rcv_skb+0x1fb/0x450 net/netlink/af_netlink.c:2511
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x74d/0x8d0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1872
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
__sys_sendto+0x497/0x650 net/socket.c:2152
__do_sys_sendto net/socket.c:2164 [inline]
__se_sys_sendto net/socket.c:2160 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:2160
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f398295cfce
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 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007fff2116d1e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000555561ef4500 RCX: 00007f398295cfce
RDX: 0000000000000028 RSI: 00007f3983744670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007fff2116d264 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f3983744670 R15: 0000000000000000