INFO: task syz-executor.5:8613 blocked for more than 143 seconds. Not tainted 5.9.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:28584 pid: 8613 ppid: 6888 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3774 [inline] __schedule+0xec5/0x2200 kernel/sched/core.c:4523 schedule+0xcf/0x270 kernel/sched/core.c:4601 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4660 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10e0 kernel/locking/mutex.c:1103 dev_ioctl+0x271/0xc40 net/core/dev_ioctl.c:535 sock_ioctl+0x57b/0x730 net/socket.c:1112 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: 0033:0x45de59 Code: Unable to access opcode bytes at RIP 0x45de2f. RSP: 002b:00007f0388308c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000001f1c0 RCX: 000000000045de59 RDX: 0000000020000080 RSI: 00000000000089f1 RDI: 0000000000000003 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffda11ecabf R14: 00007f03883099c0 R15: 000000000118bf2c INFO: task syz-executor.3:8618 blocked for more than 143 seconds. Not tainted 5.9.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:28584 pid: 8618 ppid: 6872 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:3774 [inline] __schedule+0xec5/0x2200 kernel/sched/core.c:4523 schedule+0xcf/0x270 kernel/sched/core.c:4601 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4660 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10e0 kernel/locking/mutex.c:1103 arp_ioctl+0x22c/0x800 net/ipv4/arp.c:1203 inet_ioctl+0x28d/0x330 net/ipv4/af_inet.c:945 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: 0033:0x45de59 Code: Unable to access opcode bytes at RIP 0x45de2f. RSP: 002b:00007f0be5672c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000001eb00 RCX: 000000000045de59 RDX: 0000000020000840 RSI: 0000000000008954 RDI: 0000000000000003 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffde070760f R14: 00007f0be56739c0 R15: 000000000118bf2c Showing all locks held in the system: 3 locks held by kworker/u4:6/232: 1 lock held by khungtaskd/1175: #0: ffffffff8a554a60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6259 1 lock held by in:imklog/6553: #0: ffff8880a10c03b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932 3 locks held by kworker/0:4/8153: #0: ffff88809a3b0938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88809a3b0938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff88809a3b0938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff88809a3b0938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff88809a3b0938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff88809a3b0938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2240 #1: ffffc9000aa3fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2244 #2: ffffffff8b6c18c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4568 2 locks held by syz-executor.1/8611: 1 lock held by syz-executor.5/8613: #0: ffffffff8b6c18c8 (rtnl_mutex){+.+.}-{3:3}, at: dev_ioctl+0x271/0xc40 net/core/dev_ioctl.c:535 1 lock held by syz-executor.3/8618: #0: ffffffff8b6c18c8 (rtnl_mutex){+.+.}-{3:3}, at: arp_ioctl+0x22c/0x800 net/ipv4/arp.c:1203 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-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+0x198/0x1fb lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x230 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+0xd43/0xfa0 kernel/hung_task.c:295 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3921 Comm: systemd-journal Not tainted 5.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x30/0x60 kernel/kcov.c:197 Code: fe 01 00 65 8b 05 90 c8 8c 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 35 8b 82 54 14 00 00 85 c0 74 2b 8b 82 30 14 00 00 <83> f8 02 75 20 48 8b 8a 38 14 00 00 8b 92 34 14 00 00 48 8b 01 48 RSP: 0018:ffffc90005307e88 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff888092df7d40 RCX: ffffffff81c9c88d RDX: ffff888092dc8300 RSI: ffffffff81c9c897 RDI: 0000000000000007 RBP: 0000000000000009 R08: 0000000000000000 R09: ffff8880932f5bc3 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888092df7d40 R13: 00007ffee7d05eb0 R14: dffffc0000000000 R15: 0000000000002000 FS: 00007f491f8d38c0(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f491ccb5000 CR3: 00000000939cd000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __fdget_pos+0x37/0x100 fs/file.c:927 fdget_pos include/linux/file.h:75 [inline] ksys_read+0x6e/0x250 fs/read_write.c:606 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f491ee63210 Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 RSP: 002b:00007ffee7d05638 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007ffee7d080b0 RCX: 00007f491ee63210 RDX: 0000000000002000 RSI: 00007ffee7d05eb0 RDI: 0000000000000009 RBP: 0000000000000000 R08: 0000000000000008 R09: 00005569fc1207b8 R10: 00005569fc120780 R11: 0000000000000246 R12: 00007ffee7d05eb0 R13: 00007ffee7d08008 R14: 00005569fa588958 R15: 0005b1e0e99b889e