INFO: task syz.1.375:12027 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.375 state:D stack:24584 pid:12027 tgid:12026 ppid:5827 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5257 [inline]
__schedule+0x14bc/0x5030 kernel/sched/core.c:6864
__schedule_loop kernel/sched/core.c:6946 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6961
percpu_rwsem_wait+0x2e3/0x330 kernel/locking/percpu-rwsem.c:164
__percpu_down_read+0xf0/0x130 kernel/locking/percpu-rwsem.c:180
percpu_down_read_internal include/linux/percpu-rwsem.h:67 [inline]
percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
__sb_start_write include/linux/fs/super.h:19 [inline]
sb_start_write+0x18e/0x1c0 include/linux/fs/super.h:125
mnt_want_write+0x41/0x90 fs/namespace.c:509
filename_create+0x14f/0x360 fs/namei.c:4841
do_mkdirat+0xca/0x4b0 fs/namei.c:5125
__do_sys_mkdirat fs/namei.c:5155 [inline]
__se_sys_mkdirat fs/namei.c:5153 [inline]
__x64_sys_mkdirat+0x87/0xa0 fs/namei.c:5153
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a6478f749
RSP: 002b:00007f5a65694038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f5a649e5fa0 RCX: 00007f5a6478f749
RDX: 0000000000000000 RSI: 0000200000002040 RDI: ffffffffffffff9c
RBP: 00007f5a64813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5a649e6038 R14: 00007f5a649e5fa0 R15: 00007ffebbbc2be8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8df3d980 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df3d980 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8df3d980 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:5/73:
#0: ffff88813fe69148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x841/0x15e0 kernel/workqueue.c:3236
#1: ffffc9000212fb80 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x868/0x15e0 kernel/workqueue.c:3237
2 locks held by getty/5592:
#0: ffff88814c7350a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by syz.1.375/12027:
#0: ffff888055550420 (sb_writers#33){++++}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:509
2 locks held by syz.4.698/15502:
2 locks held by modprobe/15508:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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]
__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:346 [inline]
watchdog+0xfb5/0x1000 kernel/hung_task.c:515
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15123 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:37 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:139 [inline]
RIP: 0010:wrmsrq arch/x86/include/asm/msr.h:199 [inline]
RIP: 0010:native_apic_msr_write+0x39/0x50 arch/x86/include/asm/apic.h:212
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 e9 10 f7 eb 09 cc f3 0f 1e fa 89 f6 31 d2 e9 12 19 57 03 66
RSP: 0018:ffffc90000007e50 EFLAGS: 00000046
RAX: 00000000000957e2 RBX: ffff8880b8623e40 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 00000000000957e2 RDI: 0000000000000838
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81af9575
R10: 0000000000000003 R11: ffffffff817199a0 R12: 00000000100082dc
R13: dffffc0000000000 R14: 00000000000957e2 R15: 0000000000000020
FS: 000055558e9f8500(0000) GS:ffff888125eba000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000209030 CR3: 000000006662e000 CR4: 00000000003526f0
Call Trace:
apic_write arch/x86/include/asm/apic.h:409 [inline]
lapic_next_event+0x11/0x20 arch/x86/kernel/apic/apic.c:418
clockevents_program_event+0x1c9/0x360 kernel/time/clockevents.c:334
hrtimer_interrupt+0x620/0xaa0 kernel/time/hrtimer.c:1916
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
__sysvec_apic_timer_interrupt+0x102/0x410 arch/x86/kernel/apic/apic.c:1062
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2037 [inline]
RIP: 0010:vprintk_emit+0x4ab/0x5d0 kernel/printk/printk.c:2425
Code: 0f 84 34 ff ff ff e8 b4 6b 20 00 fb eb 44 e8 ac 6b 20 00 e8 87 63 ba 09 4d 85 f6 74 94 e8 9d 6b 20 00 fb 48 c7 c7 40 1a f3 8d <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 ad 27
RSP: 0018:ffffc90003d268e0 EFLAGS: 00000293
RAX: ffffffff81a16dd3 RBX: ffffffff81a16c2c RCX: ffff888027485b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8df31a40
RBP: ffffc90003d269f0 R08: ffffffff8f7deb77 R09: 1ffffffff1efbd6e
R10: dffffc0000000000 R11: fffffbfff1efbd6f R12: 0000000000000000
R13: 0000000000000024 R14: 0000000000000200 R15: 1ffff920007a4d20
_printk+0xcf/0x120 kernel/printk/printk.c:2451
netdev_info+0x10a/0x160 net/core/dev.c:12967
__dev_set_promiscuity+0x2e8/0x750 net/core/dev.c:9539
__dev_set_rx_mode+0x17c/0x260 net/core/dev.c:-1
dev_uc_add+0xc8/0x120 net/core/dev_addr_lists.c:693
vlan_dev_set_mac_address+0x1af/0x420 net/8021q/vlan_dev.c:324
netif_set_mac_address+0x2fc/0x4c0 net/core/dev.c:9963
do_setlink+0x88c/0x41c0 net/core/rtnetlink.c:3110
rtnl_changelink net/core/rtnetlink.c:3776 [inline]
__rtnl_newlink net/core/rtnetlink.c:3935 [inline]
rtnl_newlink+0x161c/0x1c90 net/core/rtnetlink.c:4072
rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6958
netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:746
__sys_sendto+0x3bd/0x520 net/socket.c:2248
__do_sys_sendto net/socket.c:2255 [inline]
__se_sys_sendto net/socket.c:2251 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2251
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6cc51915dc
Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
RSP: 002b:00007ffd8b411e00 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f6cc5f14620 RCX: 00007f6cc51915dc
RDX: 000000000000002c RSI: 00007f6cc5f14670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffd8b411e54 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f6cc5f14670 R15: 0000000000000000