INFO: task syz.6.2462:16100 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.2462 state:D stack:27768 pid:16100 tgid:16099 ppid:12259 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5584 [inline]
__schedule+0x125e/0x6a40 kernel/sched/core.c:7389
__schedule_loop kernel/sched/core.c:7466 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7481
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7538
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0xcca/0x1c10 kernel/locking/mutex.c:821
nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2584
nfnetlink_rcv+0x1b3/0x440 net/netfilter/nfnetlink.c:667
netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
netlink_unicast+0x668/0x950 net/netlink/af_netlink.c:1361
netlink_sendmsg+0x9ac/0x10c0 net/netlink/af_netlink.c:1920
sock_sendmsg_nosec net/socket.c:800 [inline]
__sock_sendmsg net/socket.c:818 [inline]
____sys_sendmsg+0xa99/0xc30 net/socket.c:2715
___sys_sendmsg+0x190/0x1e0 net/socket.c:2769
__sys_sendmsg+0x160/0x210 net/socket.c:2801
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x7b0 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3f497a8fd9
RSP: 002b:00007f3f4a730028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3f49a25fa0 RCX: 00007f3f497a8fd9
RDX: 0000000000000000 RSI: 0000200000002700 RDI: 0000000000000003
RBP: 00007f3f49837fed R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3f49a26038 R14: 00007f3f49a25fa0 R15: 00007ffe4da6fcd8
INFO: task syz.0.2473:16129 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.2473 state:D stack:28232 pid:16129 tgid:16128 ppid:5623 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5584 [inline]
__schedule+0x125e/0x6a40 kernel/sched/core.c:7389
__schedule_loop kernel/sched/core.c:7466 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7481
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7538
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0xcca/0x1c10 kernel/locking/mutex.c:821
nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2584
nfnetlink_rcv+0x1b3/0x440 net/netfilter/nfnetlink.c:667
netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
netlink_unicast+0x668/0x950 net/netlink/af_netlink.c:1361
netlink_sendmsg+0x9ac/0x10c0 net/netlink/af_netlink.c:1920
sock_sendmsg_nosec net/socket.c:800 [inline]
__sock_sendmsg net/socket.c:818 [inline]
____sys_sendmsg+0xa99/0xc30 net/socket.c:2715
___sys_sendmsg+0x190/0x1e0 net/socket.c:2769
__sys_sendmsg+0x160/0x210 net/socket.c:2801
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x7b0 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fac9a9a8fd9
RSP: 002b:00007fac9b7fe028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fac9ac25fa0 RCX: 00007fac9a9a8fd9
RDX: 000000000000c010 RSI: 000020000000c740 RDI: 0000000000000003
RBP: 00007fac9aa37fed R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fac9ac26038 R14: 00007fac9ac25fa0 R15: 00007fff11eb48b8
Showing all locks held in the system:
locks held by kworker/u8:1/14: 3, last CPU#0:
#0: ffff88801fb43148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
#1: ffffc90000137d08 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
#2: ffffffff91f32ca0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:134 [inline]
#2: ffffffff91f32ca0 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x11f/0x1360 net/ipv6/addrconf.c:4256
locks held by pr/ttyS0/32: 2, on CPU#1:
#0: ffffffff8ffd91d8 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:314 [inline]
#0: ffffffff8ffd91d8 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:529 [inline]
#0: ffffffff8ffd91d8 (console_srcu){....}-{0:0}, at: console_srcu_read_lock+0x49/0x60 kernel/printk/printk.c:291
#1: ffffffff9cf54f58 (&port_lock_key){-.-.}-{3:3}, at: __uart_port_lock_irqsave include/linux/serial_core.h:613 [inline]
#1: ffffffff9cf54f58 (&port_lock_key){-.-.}-{3:3}, at: univ8250_console_device_lock+0x64/0xc0 drivers/tty/serial/8250/8250_core.c:413
locks held by khungtaskd/33: 1, on CPU#0:
#0: ffffffff8ffed020 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff8ffed020 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8ffed020 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6871
locks held by getty/5378: 2, last CPU#1:
#0: ffff88803563c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000322e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x1540 drivers/tty/n_tty.c:2211
locks held by syz.4.2447/16064: 3, on CPU#0:
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
#1: ffff8880580be6f0 (nlk_cb_mutex-NETFILTER){+.+.}-{4:4}, at: __netlink_dump_start+0x150/0x990 net/netlink/af_netlink.c:2438
#2: ffffffff8ffed020 (rcu_read_lock){....}-{1:3}, at: rcu_lock_release include/linux/rcupdate.h:319 [inline]
#2: ffffffff8ffed020 (rcu_read_lock){....}-{1:3}, at: rcu_read_unlock include/linux/rcupdate.h:880 [inline]
#2: ffffffff8ffed020 (rcu_read_lock){....}-{1:3}, at: cond_resched_rcu include/linux/rcupdate_wait.h:65 [inline]
#2: ffffffff8ffed020 (rcu_read_lock){....}-{1:3}, at: hash_ip6_list+0x2a1/0x1240 net/netfilter/ipset/ip_set_hash_gen.h:1568
locks held by syz.6.2462/16100: 1, last CPU#1:
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.0.2473/16129: 1, last CPU#1:
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.7.2583/16588: 1, last CPU#1:
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.8.2611/16665: 1, last CPU#1:
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.9.2660/16792: 1, last CPU#0:
#0: ffffffff9d0e4280
(nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
(nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.2.2675/16839: 1, last CPU#1:
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.3.2676/16841: 1, last CPU#1:
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz-executor/16842: 4, on CPU#0:
#0: ffffffff9014bb70 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1536 [inline]
#0: ffffffff9014bb70 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm kernel/fork.c:1602 [inline]
#0: ffffffff9014bb70 (dup_mmap_sem){.+.+}-{0:0}, at: copy_process+0x7b73/0x88e0 kernel/fork.c:2328
#1: ffff88808d488340 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:566 [inline]
#1: ffff88808d488340 (&mm->mmap_lock){++++}-{4:4}, at: dup_mm kernel/fork.c:1537 [inline]
#1: ffff88808d488340 (&mm->mmap_lock){++++}-{4:4}, at: copy_mm kernel/fork.c:1602 [inline]
#1: ffff88808d488340 (&mm->mmap_lock){++++}-{4:4}, at: copy_process+0x7b99/0x88e0 kernel/fork.c:2328
#2: ffff88808c500340 (&mm->mmap_lock/1){+.+.}-{4:4}, at: mmap_write_lock_nested include/linux/mmap_lock.h:556 [inline]
#2: ffff88808c500340 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x16e/0x2180 mm/mmap.c:1722
#3: ffffffff8ffed020 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#3: ffffffff8ffed020 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#3: ffffffff8ffed020 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x9a/0x470 mm/pgtable-generic.c:302
locks held by syz.1.2683/16992: 1, last CPU#1:
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.4.2758/17459: 1, last CPU#1:
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.0.2765/17477: 1, last CPU#1:
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.7.2791/17553: 1, last CPU#1:
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.6.2805/17612: 1, last CPU#0:
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9d0e4280 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz-executor/17614: 2, on CPU#0:
#0: ffffffff9014bb70 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1536 [inline]
#0: ffffffff9014bb70 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm kernel/fork.c:1602 [inline]
#0: ffffffff9014bb70 (dup_mmap_sem){.+.+}-{0:0}, at: copy_process+0x7b73/0x88e0 kernel/fork.c:2328
#1: ffff88807d5c7180 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:566 [inline]
#1: ffff88807d5c7180 (&mm->mmap_lock){++++}-{4:4}, at: dup_mm kernel/fork.c:1537 [inline]
#1: ffff88807d5c7180 (&mm->mmap_lock){++++}-{4:4}, at: copy_mm kernel/fork.c:1602 [inline]
#1: ffff88807d5c7180 (&mm->mmap_lock){++++}-{4:4}, at: copy_process+0x7b99/0x88e0 kernel/fork.c:2328
locks held by syz-executor/17693: 1, on CPU#0:
#0: ffffffff91f32ca0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:134 [inline]
#0: ffffffff91f32ca0 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x31c/0x18c0 net/ipv4/devinet.c:968
locks held by syz-executor/17749: 2, last CPU#0:
#0: ffffffff91421068 (&ops->srcu#2){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:249 [inline]
#0: ffffffff91421068 (&ops->srcu#2){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:356 [inline]
#0: ffffffff91421068 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x113/0x2c0 net/core/rtnetlink.c:602
#1: ffffffff91f32ca0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#1: ffffffff91f32ca0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:366 [inline]
#1: ffffffff91f32ca0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xac3/0x2620 net/core/rtnetlink.c:4251
locks held by syz.5.2843/17831: 3, on CPU#0:
#0: ffff88807b5da478 (sb_writers#6){.+.+}-{0:0}, at: do_coredump.constprop.0+0x9bb/0x25e0 fs/coredump.c:1237
#1: ffff888045905df0 (&sb->s_type->i_mutex_key#16){++++}-{4:4}, at: inode_lock include/linux/fs.h:1027 [inline]
#1: ffff888045905df0 (&sb->s_type->i_mutex_key#16){++++}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3679
#2: ffffffff8ffed020 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#2: ffffffff8ffed020 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#2: ffffffff8ffed020 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
#2: ffffffff8ffed020 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xbd/0x2090 arch/x86/kernel/unwind_orc.c:495
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 33 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x21f/0x2a0 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:377 [inline]
watchdog+0xd0f/0x10c0 kernel/hung_task.c:598
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 32 Comm: pr/ttyS0 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:io_serial_in+0x87/0xb0 drivers/tty/serial/8250/8250_port.c:426
Code: 2d 4b fc 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1a 66 03 5d 40 89 da ec <5b> 0f b6 c0 5d 41 5c c3 cc cc cc cc e8 68 86 c5 fc eb a2 e8 f1 86
RSP: 0018:ffffc90000a87950 EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: ffffffff85c353d0 RDI: ffffffff9cf54f80
RBP: ffffffff9cf54f40 R08: 000000000000001f R09: 0000000000000000
R10: 0000000000000003 R11: 205d393437373154 R12: 0000000000000000
R13: 0000000000000020 R14: fffffbfff39eaa45 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888122573000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f439a5556c8 CR3: 00000000a6adc000 CR4: 00000000003526f0
Call Trace:
serial_in drivers/tty/serial/8250/8250.h:134 [inline]
serial_lsr_in drivers/tty/serial/8250/8250.h:156 [inline]
wait_for_lsr+0x13a/0x210 drivers/tty/serial/8250/8250_port.c:2036
serial8250_fifo_wait_for_lsr_thre+0x5f/0xd0 drivers/tty/serial/8250/8250_port.c:3294
__serial8250_console_fifo_write+0xa5/0x290 drivers/tty/serial/8250/8250_port.c:3369
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3402 [inline]
__serial8250_console_write drivers/tty/serial/8250/8250_port.c:3456 [inline]
serial8250_console_write+0x1108/0x14f0 drivers/tty/serial/8250/8250_port.c:3520
nbcon_emit_next_record+0x8f7/0xa70 kernel/printk/nbcon.c:1070
nbcon_emit_one+0x1a8/0x2b0 kernel/printk/nbcon.c:1157
nbcon_kthread_func+0x5ef/0x7f0 kernel/printk/nbcon.c:1271
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245