INFO: task syz.2.2854:12397 blocked for more than 144 seconds.
Not tainted 6.17.0-rc2-next-20250818-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.2854 state:D stack:27896 pid:12397 tgid:12393 ppid:5856 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75
___down_common kernel/locking/semaphore.c:268 [inline]
__down_common+0x319/0x6a0 kernel/locking/semaphore.c:293
down+0x80/0xd0 kernel/locking/semaphore.c:100
console_lock+0x145/0x1b0 kernel/printk/printk.c:2849
con_install+0x9b/0x710 drivers/tty/vt/vt.c:3599
tty_driver_install_tty drivers/tty/tty_io.c:1295 [inline]
tty_init_dev+0xd4/0x4d0 drivers/tty/tty_io.c:1407
tty_open_by_driver drivers/tty/tty_io.c:2073 [inline]
tty_open+0x5ab/0xd10 drivers/tty/tty_io.c:2120
chrdev_open+0x4cc/0x5e0 fs/char_dev.c:414
do_dentry_open+0x953/0x13f0 fs/open.c:965
vfs_open+0x3b/0x340 fs/open.c:1095
do_open fs/namei.c:3887 [inline]
path_openat+0x2ee5/0x3830 fs/namei.c:4046
do_filp_open+0x1fa/0x410 fs/namei.c:4073
do_sys_openat2+0x121/0x1c0 fs/open.c:1435
do_sys_open fs/open.c:1450 [inline]
__do_sys_openat fs/open.c:1466 [inline]
__se_sys_openat fs/open.c:1461 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1461
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb819d8d550
RSP: 002b:00007fb81acd2b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fb819d8d550
RDX: 0000000000000002 RSI: 00007fb81acd2c10 RDI: 00000000ffffff9c
RBP: 00007fb81acd2c10 R08: 0000000000000000 R09: 00007fb81acd2987
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007fb819fb6038 R14: 00007fb819fb5fa0 R15: 00007ffdd28f7168
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.17.0-rc2-next-20250818-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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]
check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
watchdog+0xf60/0xfa0 kernel/hung_task.c:495
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 3426 Comm: kworker/R-bat_e Not tainted 6.17.0-rc2-next-20250818-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: bat_events batadv_tt_purge
RIP: 0010:slab_free mm/slub.c:4680 [inline]
RIP: 0010:kmem_cache_free+0x18f/0x400 mm/slub.c:4782
Code: ff 48 85 c0 0f 85 7c 01 00 00 45 84 ed 0f 85 d1 00 00 00 c1 ed 09 83 e5 01 41 0f b6 d5 4c 89 f7 48 89 de 89 e9 e8 91 9b 0a 00 <84> c0 75 36 48 8b 5c 24 08 65 48 8b 05 98 1e cc 10 49 8b 0e 48 8b
RSP: 0018:ffffc90000006d00 EFLAGS: 00000292
RAX: 8b7316565cfee501 RBX: ffff88803946b100 RCX: 8b7316565cfee500
RDX: 0000000000000000 RSI: ffffffff8c04e6e0 RDI: ffffffff8223c01d
RBP: 0000000000000000 R08: ffffffff8fe4f537 R09: 1ffffffff1fc9ea6
R10: dffffc0000000000 R11: fffffbfff1fc9ea7 R12: ffffea0000e51ac0
R13: 0000000000000000 R14: ffff88801decfdc0 R15: ffffffff89653e69
FS: 0000000000000000(0000) GS:ffff8881257d0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efea7b21981 CR3: 000000000e336000 CR4: 00000000003526f0
Call Trace:
skb_release_all net/core/skbuff.c:1149 [inline]
__kfree_skb net/core/skbuff.c:1165 [inline]
sk_skb_reason_drop+0xe9/0x170 net/core/skbuff.c:1203
kfree_skb_reason include/linux/skbuff.h:1275 [inline]
kfree_skb include/linux/skbuff.h:1284 [inline]
ip6_mc_input+0x8f4/0xaf0 net/ipv6/ip6_input.c:593
ip_sabotage_in+0x1e1/0x270 net/bridge/br_netfilter_hooks.c:993
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:623
nf_hook include/linux/netfilter.h:273 [inline]
NF_HOOK+0x206/0x3a0 include/linux/netfilter.h:316
__netif_receive_skb_one_core net/core/dev.c:5979 [inline]
__netif_receive_skb+0xd3/0x380 net/core/dev.c:6092
netif_receive_skb_internal net/core/dev.c:6178 [inline]
netif_receive_skb+0x1cb/0x790 net/core/dev.c:6237
NF_HOOK+0xa0/0x390 include/linux/netfilter.h:319
br_handle_frame_finish+0x14d1/0x19b0 net/bridge/br_input.c:-1
br_nf_hook_thresh+0x3c3/0x4a0 net/bridge/br_netfilter_hooks.c:-1
br_nf_pre_routing_finish_ipv6+0x948/0xd00 net/bridge/br_netfilter_ipv6.c:-1
NF_HOOK include/linux/netfilter.h:318 [inline]
br_nf_pre_routing_ipv6+0x37e/0x6b0 net/bridge/br_netfilter_ipv6.c:184
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:283 [inline]
br_handle_frame+0x982/0x14c0 net/bridge/br_input.c:434
__netif_receive_skb_core+0x10b9/0x4020 net/core/dev.c:5866
__netif_receive_skb_one_core net/core/dev.c:5977 [inline]
__netif_receive_skb+0x72/0x380 net/core/dev.c:6092
process_backlog+0x60e/0x14f0 net/core/dev.c:6444
__napi_poll+0xc7/0x360 net/core/dev.c:7494
napi_poll net/core/dev.c:7557 [inline]
net_rx_action+0x707/0xe30 net/core/dev.c:7684
handle_softirqs+0x283/0x870 kernel/softirq.c:579
do_softirq+0xec/0x180 kernel/softirq.c:480
__local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:407
spin_unlock_bh include/linux/spinlock.h:396 [inline]
batadv_tt_local_purge+0x2a7/0x340 net/batman-adv/translation-table.c:1315
batadv_tt_purge+0x35/0x9e0 net/batman-adv/translation-table.c:3509
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
rescuer_thread+0x53c/0xdd0 kernel/workqueue.c:3496
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245