INFO: task syz-executor.3:672 blocked for more than 143 seconds. Not tainted 5.9.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:29464 pid: 672 ppid: 6896 flags:0x10000004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0xec9/0x2280 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 __lock_sock+0x13d/0x260 net/core/sock.c:2518 lock_sock_nested+0xf1/0x110 net/core/sock.c:3050 lock_sock include/net/sock.h:1583 [inline] sctp_getsockopt net/sctp/socket.c:7820 [inline] sctp_getsockopt+0x249/0x6e20 net/sctp/socket.c:7793 __sys_getsockopt+0x219/0x4c0 net/socket.c:2173 __do_sys_getsockopt net/socket.c:2188 [inline] __se_sys_getsockopt net/socket.c:2185 [inline] __x64_sys_getsockopt+0xba/0x150 net/socket.c:2185 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e179 Code: Bad RIP value. RSP: 002b:00007f0bac5c2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 0000000000005a40 RCX: 000000000045e179 RDX: 0000000000000013 RSI: 0000000000000084 RDI: 0000000000000003 RBP: 000000000118d038 R08: 0000000020000040 R09: 0000000000000000 R10: 0000000020001280 R11: 0000000000000246 R12: 000000000118cff4 R13: 00007ffc03f05aaf R14: 00007f0bac5c39c0 R15: 000000000118cff4 INFO: task syz-executor.3:673 blocked for more than 144 seconds. Not tainted 5.9.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:29464 pid: 673 ppid: 6896 flags:0x10004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0xec9/0x2280 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 __lock_sock+0x13d/0x260 net/core/sock.c:2518 lock_sock_nested+0xf1/0x110 net/core/sock.c:3050 lock_sock include/net/sock.h:1583 [inline] sctp_ioctl+0x1e/0x1c0 net/sctp/socket.c:4770 inet6_ioctl+0x1b4/0x280 net/ipv6/af_inet6.c:572 sock_do_ioctl+0xcb/0x2d0 net/socket.c:1047 sock_ioctl+0x3b8/0x730 net/socket.c:1198 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e179 Code: Bad RIP value. RSP: 002b:00007f0bac5a1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000012d40 RCX: 000000000045e179 RDX: 0000000000400200 RSI: 0000000000008912 RDI: 0000000000000004 RBP: 000000000118d0d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118d09c R13: 00007ffc03f05aaf R14: 00007f0bac5a29c0 R15: 000000000118d09c Showing all locks held in the system: 1 lock held by khungtaskd/1171: #0: ffffffff8a067f00 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5852 3 locks held by kworker/1:2/2637: #0: ffff888099daa538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888099daa538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888099daa538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888099daa538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888099daa538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888099daa538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240 #1: ffffc90009277da8 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244 #2: ffffffff8b148e28 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xa3/0x1280 net/ipv6/addrconf.c:4027 1 lock held by in:imklog/6750: #0: ffff8880971e5b70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930 3 locks held by kworker/0:5/8198: 4 locks held by syz-executor.3/669: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1171 Comm: khungtaskd Not tainted 5.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x198/0x1fd lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd7d/0x1000 kernel/hung_task.c:295 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 73 Comm: kworker/u4:4 Not tainted 5.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_purge_orig RIP: 0010:trace_lock_acquire include/trace/events/lock.h:13 [inline] RIP: 0010:lock_acquire+0xc6/0xaf0 kernel/locking/lockdep.c:5003 Code: 0f 87 3e 07 00 00 45 89 ff be 08 00 00 00 4c 89 f8 48 c1 f8 06 48 8d 3c c5 c8 1c 59 8b e8 e2 d6 5a 00 4c 0f a3 3d a2 13 fd 09 <0f> 82 ee 02 00 00 65 4c 8b 3c 25 c0 fe 01 00 49 8d bf e4 08 00 00 RSP: 0018:ffffc900010b7ae0 EFLAGS: 00000247 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff815c091e RDX: fffffbfff16b239a RSI: 0000000000000008 RDI: ffffffff8b591cc8 RBP: ffff88804d4073d8 R08: 0000000000000000 R09: ffffffff8b591ccf R10: fffffbfff16b2399 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd055a9f020 CR3: 00000000a26dc000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:359 [inline] batadv_purge_orig_ref+0x176/0x1540 net/batman-adv/originator.c:1350 batadv_purge_orig+0x17/0x60 net/batman-adv/originator.c:1379 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294