INFO: task syz-executor.1:26207 blocked for more than 143 seconds. Not tainted 5.8.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D27696 26207 19782 0x80004006 Call Trace: context_switch kernel/sched/core.c:3430 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4155 schedule+0xd0/0x2a0 kernel/sched/core.c:4230 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4289 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 tun_detach drivers/net/tun.c:704 [inline] tun_chr_close+0x3a/0x180 drivers/net/tun.c:3421 __fput+0x33c/0x880 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:123 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xb72/0x2a40 kernel/exit.c:805 do_group_exit+0x125/0x310 kernel/exit.c:903 get_signal+0x428/0x1fc0 kernel/signal.c:2739 do_signal+0x82/0x2520 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:212 [inline] __prepare_exit_to_usermode+0x156/0x1f0 arch/x86/entry/common.c:246 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:368 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cb19 Code: Bad RIP value. RSP: 002b:00007f7b08d1ecf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000078bf08 RCX: 000000000045cb19 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000078bf08 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffe3a97b11f R14: 00007f7b08d1f9c0 R15: 000000000078bf0c Showing all locks held in the system: 3 locks held by kworker/1:0/17: #0: ffff888214f4b538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888214f4b538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888214f4b538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888214f4b538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888214f4b538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888214f4b538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240 #1: ffffc90000d8fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244 #2: ffffffff8a7b0468 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4543 1 lock held by khungtaskd/1147: #0: ffffffff89bbe640 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779 1 lock held by systemd-journal/3878: 1 lock held by syz-executor.1/26207: #0: ffffffff8a7b0468 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:704 [inline] #0: ffffffff8a7b0468 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3421 2 locks held by syz-executor.1/27674: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1147 Comm: khungtaskd Not tainted 5.8.0-rc2-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+0x18f/0x20d 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:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3878 Comm: systemd-journal Not tainted 5.8.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:trace_hardirqs_off+0x56/0x210 kernel/trace/trace_preemptirq.c:84 Code: 10 51 fa ff 65 c7 05 15 08 8a 7e 01 00 00 00 65 8b 1d ce fe 88 7e 81 e3 00 00 f0 00 31 ff 89 de e8 6f 4d fa ff 85 db 74 0d 5b <5d> 41 5c 41 5d 41 5e e9 de 50 fa ff e8 d9 50 fa ff 4c 8b 6c 24 28 RSP: 0018:ffffc90001647968 EFLAGS: 00000093 RAX: 0000000000000000 RBX: ffff8880679f2000 RCX: ffffffff81790001 RDX: ffff8880a72da280 RSI: ffffffff81790026 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880679f2930 R13: ffffffff81b2a9d7 R14: ffff8880a9530c40 R15: 0000000000000286 FS: 00007f697cecf8c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000033771fb8 CR3: 00000000a81f4000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x67/0x140 mm/kasan/quarantine.c:167 quarantine_reduce+0x17e/0x200 mm/kasan/quarantine.c:260 __kasan_kmalloc.constprop.0+0x9e/0xd0 mm/kasan/common.c:475 slab_post_alloc_hook mm/slab.h:586 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc+0x12c/0x3b0 mm/slab.c:3484 kmem_cache_zalloc include/linux/slab.h:659 [inline] lsm_file_alloc security/security.c:567 [inline] security_file_alloc+0x34/0x170 security/security.c:1440 __alloc_file+0xd8/0x350 fs/file_table.c:106 alloc_empty_file+0x6d/0x170 fs/file_table.c:151 path_openat+0xe3/0x2750 fs/namei.c:3346 do_filp_open+0x17e/0x3c0 fs/namei.c:3387 do_sys_openat2+0x16f/0x3b0 fs/open.c:1179 do_sys_open fs/open.c:1195 [inline] ksys_open include/linux/syscalls.h:1388 [inline] __do_sys_open fs/open.c:1201 [inline] __se_sys_open fs/open.c:1199 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1199 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f697c45f840 Code: Bad RIP value. RSP: 002b:00007ffd932a7a88 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffd932a7d90 RCX: 00007f697c45f840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055e877aec3c0 RBP: 000000000000000d R08: 00000000000001c0 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055e877adf060 R14: 00007ffd932a7d50 R15: 000055e877aebff0