INFO: task kworker/0:2:16817 blocked for more than 143 seconds.
Not tainted 5.15.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:2 state:D stack:23768 pid:16817 ppid: 2 flags:0x00004000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
context_switch kernel/sched/core.c:4940 [inline]
__schedule+0xc8d/0x1270 kernel/sched/core.c:6287
schedule+0x14b/0x210 kernel/sched/core.c:6366
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425
__mutex_lock_common+0xdff/0x2550 kernel/locking/mutex.c:669
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:743
addrconf_dad_work+0xdb/0x1d10 net/ipv6/addrconf.c:4047
process_one_work+0x853/0x1140 kernel/workqueue.c:2297
worker_thread+0xac1/0x1320 kernel/workqueue.c:2444
kthread+0x453/0x480 kernel/kthread.c:319
ret_from_fork+0x1f/0x30
INFO: task kworker/1:17:18246 blocked for more than 143 seconds.
Not tainted 5.15.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:17 state:D stack:25680 pid:18246 ppid: 2 flags:0x00004000
Workqueue: events switchdev_deferred_process_work
Call Trace:
context_switch kernel/sched/core.c:4940 [inline]
__schedule+0xc8d/0x1270 kernel/sched/core.c:6287
schedule+0x14b/0x210 kernel/sched/core.c:6366
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425
__mutex_lock_common+0xdff/0x2550 kernel/locking/mutex.c:669
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:743
switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74
process_one_work+0x853/0x1140 kernel/workqueue.c:2297
worker_thread+0xac1/0x1320 kernel/workqueue.c:2444
kthread+0x453/0x480 kernel/kthread.c:319
ret_from_fork+0x1f/0x30
INFO: task syz-executor.0:18358 blocked for more than 143 seconds.
Not tainted 5.15.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:20272 pid:18358 ppid: 1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4940 [inline]
__schedule+0xc8d/0x1270 kernel/sched/core.c:6287
schedule+0x14b/0x210 kernel/sched/core.c:6366
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425
__mutex_lock_common+0xdff/0x2550 kernel/locking/mutex.c:669
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:743
rtnl_lock net/core/rtnetlink.c:72 [inline]
rtnetlink_rcv_msg+0x8ed/0xe60 net/core/rtnetlink.c:5569
netlink_rcv_skb+0x200/0x470 net/netlink/af_netlink.c:2504
netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
netlink_unicast+0x814/0x9f0 net/netlink/af_netlink.c:1340
netlink_sendmsg+0xa29/0xe50 net/netlink/af_netlink.c:1929
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg net/socket.c:724 [inline]
__sys_sendto+0x560/0x720 net/socket.c:2036
__do_sys_sendto net/socket.c:2048 [inline]
__se_sys_sendto net/socket.c:2044 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:2044
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f014538469c
RSP: 002b:00007fff0753bbb0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f014640e320 RCX: 00007f014538469c
RDX: 0000000000000028 RSI: 00007f014640e370 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007fff0753bc04 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f014640e370 R14: 0000000000000003 R15: 0000000000000000
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c91c1c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by kworker/u4:5/1173:
1 lock held by in:imklog/6200:
#0: ffff88807b1c5c70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990
2 locks held by rs:main Q:Reg/6201:
#0: ffff88801cf22d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990
#1: ffff888026d84460 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x2b5/0xe90 fs/read_write.c:590
2 locks held by agetty/6239:
#0: ffff888025d22098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900013582e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6c5/0x1c60 drivers/tty/n_tty.c:2113
5 locks held by kworker/u4:7/9230:
3 locks held by kworker/0:2/16817:
#0: ffff888025bdd538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140
#1: ffffc9000b0f7d20 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272
#2: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xdb/0x1d10 net/ipv6/addrconf.c:4047
3 locks held by kworker/1:14/18243:
#0: ffff888011065d38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140
#1: ffffc9000bd1fd20 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272
#2: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: reg_check_chans_work+0x7a/0x800 net/wireless/reg.c:2423
3 locks held by kworker/1:15/18244:
#0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140
#1: ffffc9000bd2fd20 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272
#2: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:251
3 locks held by kworker/1:17/18246:
#0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140
#1: ffffc9000bd3fd20 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272
#2: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74
1 lock held by syz-executor.0/18358:
#0: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
#0: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x8ed/0xe60 net/core/rtnetlink.c:5569
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106
nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
watchdog+0xc54/0xca0 kernel/hung_task.c:295
kthread+0x453/0x480 kernel/kthread.c:319
ret_from_fork+0x1f/0x30
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 271 Comm: kworker/0:1H Not tainted 5.15.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: 0x0 (kblockd)
RIP: 0010:rb_set_black lib/rbtree.c:61 [inline]
RIP: 0010:____rb_erase_color lib/rbtree.c:283 [inline]
RIP: 0010:rb_erase+0xa14/0xf40 lib/rbtree.c:445
Code: 4c 89 75 00 e9 33 05 00 00 48 b8 00 00 00 00 00 fc ff df 41 80 3c 07 00 74 08 48 89 df e8 e4 d7 96 fd 4c 89 33 e9 12 05 00 00 <48> 83 cd 01 42 80 3c 3b 00 0f 84 c2 04 00 00 4c 89 f7 e8 c5 d7 96
RSP: 0018:ffffc90001d4fb48 EFLAGS: 00000046
RAX: 1ffff1100f99faca RBX: 1ffff1100f05273a RCX: dffffc0000000000
RDX: ffffc90001d4fd20 RSI: ffff8880b9c31630 RDI: ffff888078bfb9d8
RBP: ffff88801d0e1d50 R08: ffffffff813c97af R09: ffffed10173864a2
R10: ffffed10173864a2 R11: 0000000000000000 R12: 1ffff1100f99faca
R13: ffff88807ccfd650 R14: ffff8880782939d0 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4788032000 CR3: 0000000071bec000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rb_erase_cached include/linux/rbtree.h:126 [inline]
__dequeue_entity kernel/sched/fair.c:585 [inline]
set_next_entity+0x2d3/0x730 kernel/sched/fair.c:4491
pick_next_task_fair+0x3a8/0x9a0 kernel/sched/fair.c:7341
__pick_next_task kernel/sched/core.c:5561 [inline]
pick_next_task kernel/sched/core.c:6103 [inline]
__schedule+0x6ee/0x1270 kernel/sched/core.c:6251
schedule+0x14b/0x210 kernel/sched/core.c:6366
worker_thread+0xfd5/0x1320 kernel/workqueue.c:2465
kthread+0x453/0x480 kernel/kthread.c:319
ret_from_fork+0x1f/0x30
----------------
Code disassembly (best guess):
0: 4c 89 75 00 mov %r14,0x0(%rbp)
4: e9 33 05 00 00 jmpq 0x53c
9: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
10: fc ff df
13: 41 80 3c 07 00 cmpb $0x0,(%r15,%rax,1)
18: 74 08 je 0x22
1a: 48 89 df mov %rbx,%rdi
1d: e8 e4 d7 96 fd callq 0xfd96d806
22: 4c 89 33 mov %r14,(%rbx)
25: e9 12 05 00 00 jmpq 0x53c
* 2a: 48 83 cd 01 or $0x1,%rbp <-- trapping instruction
2e: 42 80 3c 3b 00 cmpb $0x0,(%rbx,%r15,1)
33: 0f 84 c2 04 00 00 je 0x4fb
39: 4c 89 f7 mov %r14,%rdi
3c: e8 .byte 0xe8
3d: c5 .byte 0xc5
3e: d7 xlat %ds:(%rbx)
3f: 96 xchg %eax,%esi