INFO: task syz.7.334:8450 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.334 state:D stack:25400 pid:8450 tgid:8448 ppid:7505 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x145f/0x5070 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
percpu_rwsem_wait+0x2e6/0x330 kernel/locking/percpu-rwsem.c:164
__percpu_down_read+0xfc/0x140 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:499
do_renameat2+0x29f/0x8f0 fs/namei.c:6020
__do_sys_rename fs/namei.c:6099 [inline]
__se_sys_rename fs/namei.c:6097 [inline]
__x64_sys_rename+0x82/0x90 fs/namei.c:6097
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1d2d02f749
RSP: 002b:00007f1d2b296038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f1d2d285fa0 RCX: 00007f1d2d02f749
RDX: 0000000000000000 RSI: 0000200000000b00 RDI: 0000200000000b40
RBP: 00007f1d2d0b3f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1d2d286038 R14: 00007f1d2d285fa0 R15: 00007ffe6f4e3c88
INFO: task syz.7.334:8470 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.334 state:D stack:25640 pid:8470 tgid:8448 ppid:7505 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x145f/0x5070 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
percpu_rwsem_wait+0x2e6/0x330 kernel/locking/percpu-rwsem.c:164
__percpu_down_read+0xfc/0x140 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:499
open_last_lookups fs/namei.c:4538 [inline]
path_openat+0xae9/0x3df0 fs/namei.c:4793
do_filp_open+0x1fa/0x410 fs/namei.c:4823
do_sys_openat2+0x121/0x200 fs/open.c:1430
do_sys_open fs/open.c:1436 [inline]
__do_sys_openat fs/open.c:1452 [inline]
__se_sys_openat fs/open.c:1447 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1447
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1d2d02f749
RSP: 002b:00007f1d2b275038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f1d2d286090 RCX: 00007f1d2d02f749
RDX: 0000000000048042 RSI: 00002000000003c0 RDI: ffffffffffffff9c
RBP: 00007f1d2d0b3f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000008c R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1d2d286128 R14: 00007f1d2d286090 R15: 00007ffe6f4e3c88
Showing all locks held in the system:
6 locks held by kworker/u8:2/37:
1 lock held by khungtaskd/39:
#0: ffffffff8d5ae940 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8d5ae940 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8d5ae940 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:12/3473:
3 locks held by kworker/u8:15/3568:
#0: ffff88814d146138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3232 [inline]
#0: ffff88814d146138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770 kernel/workqueue.c:3340
#1: ffffc9000eccfbc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3233 [inline]
#1: ffffc9000eccfbc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770 kernel/workqueue.c:3340
#2: ffffffff8e8a5978 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#2: ffffffff8e8a5978 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x119/0x15a0 net/ipv6/addrconf.c:4194
2 locks held by udevd/5169:
2 locks held by getty/5557:
#0: ffff88814de750a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e8b2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x44f/0x1460 drivers/tty/n_tty.c:2211
1 lock held by syz.7.334/8450:
#0: ffff88803d28a480 (sb_writers#30){++++}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
1 lock held by syz.7.334/8470:
#0: ffff88803d28a480 (sb_writers#30){++++}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
7 locks held by syz-executor/9412:
9 locks held by syz-executor/9445:
1 lock held by udevd/9807:
1 lock held by rm/9839:
4 locks held by syz.4.492/9841:
=============================================
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 10/25/2025
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 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+0xf95/0xfe0 kernel/hung_task.c:515
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x510/0xa50 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: 9837 Comm: syz.2.490 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:rcu_rdp_cpu_online kernel/rcu/tree.c:3995 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online+0x8e/0x120 kernel/rcu/tree.c:4036
Code: df e8 e6 01 7c 00 48 8b 03 48 8d 98 80 e6 b4 91 48 8d b8 a8 e6 b4 91 48 89 f8 48 c1 e8 03 42 80 3c 30 00 74 05 e8 c2 01 7c 00 <4c> 8b 7b 28 48 83 c3 20 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08
RSP: 0000:ffffc90004ec7c10 EFLAGS: 00000246
RAX: 1ffff110171078d5 RBX: ffff8880b883c680 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8b3f5ac0 RDI: ffff8880b883c6a8
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000003 R12: 000055558d99c000
R13: 00007f17098befff R14: dffffc0000000000 R15: ffff8880373e3000
FS: 00007f1707cb66c0(0000) GS:ffff888126cee000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1700c08000 CR3: 0000000034e82000 CR4: 00000000003526f0
Call Trace:
rcu_read_lock_held_common kernel/rcu/update.c:113 [inline]
rcu_read_lock_held+0x1e/0x50 kernel/rcu/update.c:349
mt_slot lib/maple_tree.c:736 [inline]
mtree_range_walk+0x52d/0x840 lib/maple_tree.c:2579
mas_state_walk lib/maple_tree.c:3298 [inline]
mas_walk+0xc6/0x2e0 lib/maple_tree.c:4599
lock_vma_under_rcu+0x193/0x4a0 mm/mmap_lock.c:253
do_user_addr_fault+0x2d9/0x1380 arch/x86/mm/fault.c:1327
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x71/0xd0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f17099109e6
Code: f0 72 6e 48 63 cd 48 01 c1 49 39 4f 08 72 4c 8d 4d ff 85 ed 74 33 66 0f 1f 44 00 00 48 39 f0 72 1b 4d 8b 07 49 89 c1 49 29 f1 <47> 0f b6 0c 08 45 84 c9 74 08 45 88 0c 00 49 8b 47 10 48 83 c0 01
RSP: 002b:00007f1707cb54a0 EFLAGS: 00010206
RAX: 0000000001372001 RBX: 00007f1707cb5540 RCX: 0000000000000021
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f1707cb55e0
RBP: 0000000000000102 R08: 00007f16ff896000 R09: 0000000001372000
R10: 0000000000000000 R11: 00007f1707cb5550 R12: 0000000000000001
R13: 00007f1709aefc40 R14: 0000000000000000 R15: 00007f1707cb55e0