INFO: task syz-executor.1:21676 blocked for more than 140 seconds. Not tainted 4.19.128-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D30224 21676 6583 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8a2/0x1fc0 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3d4/0x7a0 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 register_netdevice_notifier+0x7b/0x5a0 net/core/dev.c:1643 raw_init+0x296/0x340 net/can/raw.c:343 can_create+0x27c/0x4a0 net/can/af_can.c:184 __sock_create+0x3d5/0x740 net/socket.c:1276 sock_create net/socket.c:1316 [inline] __sys_socket+0xef/0x200 net/socket.c:1346 __do_sys_socket net/socket.c:1355 [inline] __se_sys_socket net/socket.c:1353 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1353 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca59 Code: Bad RIP value. RSP: 002b:00007f18c1923c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 0000000000507960 RCX: 000000000045ca59 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000b9b R14: 00000000004cdfa5 R15: 00007f18c19246d4 INFO: task syz-executor.1:21679 blocked for more than 140 seconds. Not tainted 4.19.128-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D29936 21679 6583 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8a2/0x1fc0 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3d4/0x7a0 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 register_netdevice_notifier+0x7b/0x5a0 net/core/dev.c:1643 raw_init+0x296/0x340 net/can/raw.c:343 can_create+0x27c/0x4a0 net/can/af_can.c:184 __sock_create+0x3d5/0x740 net/socket.c:1276 sock_create net/socket.c:1316 [inline] __sys_socket+0xef/0x200 net/socket.c:1346 __do_sys_socket net/socket.c:1355 [inline] __se_sys_socket net/socket.c:1353 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1353 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca59 Code: Bad RIP value. RSP: 002b:00007f18c1902c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 0000000000507960 RCX: 000000000045ca59 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000b9b R14: 00000000004cdfa5 R15: 00007f18c19036d4 Showing all locks held in the system: 1 lock held by khungtaskd/1079: #0: 0000000047b80f36 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 1 lock held by in:imklog/6144: #0: 000000007e365ec7 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:767 2 locks held by agetty/6157: #0: 0000000078e53bbb (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 0000000052949538 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154 2 locks held by syz-executor.2/19962: 1 lock held by syz-executor.1/21676: #0: 000000002f44bcf2 (pernet_ops_rwsem){++++}, at: register_netdevice_notifier+0x7b/0x5a0 net/core/dev.c:1643 1 lock held by syz-executor.1/21679: #0: 000000002f44bcf2 (pernet_ops_rwsem){++++}, at: register_netdevice_notifier+0x7b/0x5a0 net/core/dev.c:1643 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1079 Comm: khungtaskd Not tainted 4.19.128-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+0x1fc/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x962/0xe40 kernel/hung_task.c:287 kthread+0x30b/0x410 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10816 Comm: syz-executor.0 Not tainted 4.19.128-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lock_release+0x149/0x810 kernel/locking/lockdep.c:3924 Code: 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3d 05 00 00 83 84 08 00 00 01 00 00 00 0f 1f 44 00 00 65 8b 05 21 6f b1 7e RSP: 0000:ffff88803df0fa60 EFLAGS: 00000046 RAX: 0000000000000007 RBX: ffff88809a7a8340 RCX: 1ffff110134f517d RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88809a7a8bc4 RBP: ffff88808e88c808 R08: 0000000000000000 R09: ffffffff8b1b1b38 R10: ffff88809a7a8bc8 R11: b369cb708827d641 R12: 1ffff11007be1f50 R13: ffffffff818feecf R14: 0000000000000000 R15: 00007ffffffff000 FS: 00007f3c80f12700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000009053f0c CR3: 000000004c107000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __might_fault mm/memory.c:4638 [inline] __might_fault+0x192/0x1d0 mm/memory.c:4623 __copy_to_user include/linux/uaccess.h:102 [inline] save_xstate_epilog arch/x86/kernel/fpu/signal.c:89 [inline] copy_fpstate_to_sigframe+0x32f/0x6b0 arch/x86/kernel/fpu/signal.c:203 get_sigframe.isra.0.constprop.0+0x4a5/0x6a0 arch/x86/kernel/signal.c:284 __setup_rt_frame arch/x86/kernel/signal.c:466 [inline] setup_rt_frame arch/x86/kernel/signal.c:711 [inline] handle_signal arch/x86/kernel/signal.c:755 [inline] do_signal+0xaaf/0x1620 arch/x86/kernel/signal.c:823 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode+0x27b/0x2e0 arch/x86/entry/common.c:198 retint_user+0x8/0x18 RIP: 0033:0x9053f0c Code: Bad RIP value. RSP: 002b:00007f3c80f11c70 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000000403771 RCX: 0000000000000002 RDX: fffffffffffffff7 RSI: 0000000000000002 RDI: 0000000000000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000000 R12: 00000000ffffffff R13: 0000000000000c13 R14: 00000000000000d7 R15: 00007f3c80f126d4