INFO: task syz-executor:5992 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:23096 pid: 5992 ppid: 5986 flags:0x00104004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
__mutex_lock_common+0xcfc/0x2400 kernel/locking/mutex.c:669
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
rtnl_lock net/core/rtnetlink.c:72 [inline]
rtnetlink_rcv_msg+0x7ee/0xf30 net/core/rtnetlink.c:5681
netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2507
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
__sys_sendto+0x46d/0x620 net/socket.c:2072
__do_sys_sendto net/socket.c:2084 [inline]
__se_sys_sendto net/socket.c:2080 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:2080
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f2ddd30c04e
RSP: 002b:00007ffd5d0ed498 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000555586c04500 RCX: 00007f2ddd30c04e
RDX: 000000000000002c RSI: 00007f2dde0f3670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffd5d0ed514 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f2dde0f3670 R15: 0000000000000000
</TASK>
Showing all locks held in the system:
2 locks held by init/1:
#0: ffff88802c7b0128 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88802c7b0128 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2b9/0xc80 arch/x86/mm/fault.c:1296
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x10e8/0x28b0 mm/page_alloc.c:5128
3 locks held by kworker/0:1/13:
#0: ffff888016c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
#1: ffffc90000d27d00 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
#2: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74
1 lock held by khungtaskd/27:
#0: ffffffff8c31eaa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by udevd/3561:
#0: ffff88807e626a28 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88807e626a28 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2b9/0xc80 arch/x86/mm/fault.c:1296
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x10e8/0x28b0 mm/page_alloc.c:5128
2 locks held by dhcpcd/3854:
#0: ffff88801fc66210 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#0: ffff88801fc66210 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: __sock_release net/socket.c:650 [inline]
#0: ffff88801fc66210 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: sock_close+0x90/0x240 net/socket.c:1345
#1: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: ip6mr_sk_done+0xaa/0x2b0 net/ipv6/ip6mr.c:1584
2 locks held by getty/3946:
#0: ffff88802c720098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900021ce2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5df/0x1a70 drivers/tty/n_tty.c:2158
4 locks held by dhcpcd/3987:
3 locks held by dhcpcd/3992:
2 locks held by dhcpcd/3993:
2 locks held by dhcpcd/3999:
2 locks held by dhcpcd/4002:
4 locks held by sshd-session/4171:
3 locks held by kworker/1:3/4228:
#0: ffff88802b000938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
#1: ffffc90002397d00 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
#2: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4654
3 locks held by kworker/u4:13/4563:
8 locks held by kworker/u4:14/4723:
2 locks held by dhcpcd/5093:
#0: ffff88807e625c28 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88807e625c28 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2b9/0xc80 arch/x86/mm/fault.c:1296
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x10e8/0x28b0 mm/page_alloc.c:5128
2 locks held by dhcpcd/5374:
#0: ffff88802c7b5528 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88802c7b5528 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2b9/0xc80 arch/x86/mm/fault.c:1296
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x10e8/0x28b0 mm/page_alloc.c:5128
2 locks held by dhcpcd/5492:
#0: ffff88807b3c8128 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88807b3c8128 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2b9/0xc80 arch/x86/mm/fault.c:1296
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x10e8/0x28b0 mm/page_alloc.c:5128
2 locks held by dhcpcd/5526:
2 locks held by dhcpcd/5543:
#0: ffff88801e475c28 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88801e475c28 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2b9/0xc80 arch/x86/mm/fault.c:1296
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x10e8/0x28b0 mm/page_alloc.c:5128
2 locks held by syz.4.416/5607:
3 locks held by syz-executor/5986:
#0: ffff8880277a4f88 (&tsk->futex_exit_mutex){+.+.}-{3:3}, at: futex_cleanup_begin kernel/futex/core.c:3893 [inline]
#0: ffff8880277a4f88 (&tsk->futex_exit_mutex){+.+.}-{3:3}, at: futex_exit_release+0x2f/0x1c0 kernel/futex/core.c:3945
#1: ffff88801e470128 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#1: ffff88801e470128 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2b9/0xc80 arch/x86/mm/fault.c:1296
#2: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#2: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#2: ffffffff8c3de9c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x10e8/0x28b0 mm/page_alloc.c:5128
1 lock held by syz-executor/5992:
#0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
#0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7ee/0xf30 net/core/rtnetlink.c:5681
1 lock held by syz-executor/5996:
#0: ffffffff8cb0e448 (gdp_mutex){+.+.}-{3:3}, at: cleanup_glue_dir+0xb5/0x200 drivers/base/core.c:3063
=============================================
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 03/18/2026
Call Trace:
<TASK>
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0xe0f/0xe50 kernel/hung_task.c:369
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4171 Comm: sshd-session Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x8a/0x290 mm/kasan/generic.c:189
Code: 1c 21 49 89 df 4d 29 df 49 83 ff 10 7f 29 4d 85 ff 0f 84 38 01 00 00 4c 89 cb 48 f7 d3 4c 01 f3 41 80 3b 00 0f 85 86 01 00 00 <49> ff c3 48 ff c3 75 ee e9 18 01 00 00 44 89 dd 83 e5 07 0f 84 b5
RSP: 0000:ffffc900023062b0 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffffffffffffffff RCX: ffffffff815db944
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff901d40c0
RBP: 0000000000000009 R08: ffffffff901d40c7 R09: 1ffffffff203a818
R10: dffffc0000000000 R11: fffffbfff203a818 R12: dffffc0000000001
R13: dffffc0000000000 R14: 1ffffffff203a818 R15: 0000000000000001
FS: 00007effb7e21300(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd0f69593dd CR3: 000000007316b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
instrument_atomic_read include/linux/instrumented.h:71 [inline]
test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
hlock_class kernel/locking/lockdep.c:197 [inline]
mark_lock+0x94/0x320 kernel/locking/lockdep.c:4569
mark_usage kernel/locking/lockdep.c:4512 [inline]
__lock_acquire+0xd69/0x7d10 kernel/locking/lockdep.c:4966
lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
rcu_lock_acquire+0x20/0x30 include/linux/rcupdate.h:313
rcu_read_lock include/linux/rcupdate.h:740 [inline]
percpu_ref_put_many include/linux/percpu-refcount.h:317 [inline]
percpu_ref_put+0x16/0x150 include/linux/percpu-refcount.h:338
css_put include/linux/cgroup.h:405 [inline]
mem_cgroup_iter+0x37a/0x480 mm/memcontrol.c:1125
shrink_node_memcgs mm/vmscan.c:2966 [inline]
shrink_node+0x1197/0x2610 mm/vmscan.c:3079
shrink_zones mm/vmscan.c:3285 [inline]
do_try_to_free_pages+0x606/0x1600 mm/vmscan.c:3340
try_to_free_pages+0x9a1/0xea0 mm/vmscan.c:3575
__perform_reclaim mm/page_alloc.c:4657 [inline]
__alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
__alloc_pages_slowpath+0x116a/0x28b0 mm/page_alloc.c:5128
__alloc_pages+0x340/0x480 mm/page_alloc.c:5514
alloc_pages_vma+0x393/0x7c0 mm/mempolicy.c:2146
__read_swap_cache_async+0x1b5/0xa70 mm/swap_state.c:459
read_swap_cache_async mm/swap_state.c:525 [inline]
swap_cluster_readahead+0x6a3/0x7c0 mm/swap_state.c:661
swapin_readahead+0xf1/0xac0 mm/swap_state.c:854
do_swap_page+0x4b6/0x1f40 mm/memory.c:3622
handle_pte_fault mm/memory.c:4654 [inline]
__handle_mm_fault mm/memory.c:4785 [inline]
handle_mm_fault+0x1b16/0x4410 mm/memory.c:4883
do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1355
handle_page_fault arch/x86/mm/fault.c:1443 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1496
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0010:do_sys_poll+0xf56/0x11a0 fs/select.c:1025
Code: 8b 74 24 30 4c 8d 76 12 48 8b 54 24 68 48 83 c2 06 45 31 ff 4c 89 f0 48 c1 e8 03 42 0f b6 04 28 84 c0 75 2b 42 0f b7 44 fe 12 <66> 89 02 49 89 d4 44 39 fb 74 3b e8 0a f3 aa ff 49 ff c7 49 83 c6
RSP: 0000:ffffc90002307860 EFLAGS: 00050246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffff88807ab50000
RDX: 0000557dcb8e4186 RSI: ffffc90002307c70 RDI: 0000000000000000
RBP: ffffc90002307e10 R08: ffff888077d5e57f R09: 1ffff1100efabcaf
R10: dffffc0000000000 R11: ffffed100efabcb0 R12: 0000557dcb8e41a0
R13: dffffc0000000000 R14: ffffc90002307c82 R15: 0000000000000000
__do_sys_ppoll fs/select.c:1120 [inline]
__se_sys_ppoll+0x206/0x2a0 fs/select.c:1100
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7effb7f15407
Code: Unable to access opcode bytes at RIP 0x7effb7f153dd.
RSP: 002b:00007ffcf7d8e8c0 EFLAGS: 00000202 ORIG_RAX: 000000000000010f
RAX: ffffffffffffffda RBX: 00007effb7e21300 RCX: 00007effb7f15407
RDX: 00007ffcf7d8e900 RSI: 0000000000000004 RDI: 0000557dcb8e4180
RBP: 00007ffcf7d8e970 R08: 0000000000000008 R09: 0000000000000000
R10: 00007ffcf7d8ea00 R11: 0000000000000202 R12: 0000000000000001
R13: 00007ffcf7d8ea00 R14: 0000000000000041 R15: 0000000000000004
</TASK>