kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 1592 Comm: syz-executor953 Not tainted 5.4.61-syzkaller-00823-g34364883b1f7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:file_tty drivers/tty/tty_io.c:181 [inline] RIP: 0010:__tty_fasync drivers/tty/tty_io.c:2120 [inline] RIP: 0010:tty_release+0xf0/0x1100 drivers/tty/tty_io.c:1664 Code: 00 00 00 fc ff df 41 80 7c 05 00 00 74 08 4c 89 f7 e8 c4 15 34 ff 49 8b 1e 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 a2 15 34 ff 4c 89 74 24 18 48 8b 2b RSP: 0018:ffff8881cc727da0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000005401 R08: ffffffff823c3e0c R09: ffffed10398e05a1 R10: ffffed10398e05a1 R11: 0000000000000000 R12: ffff8881cc6eb000 R13: 1ffff110399b4a69 R14: ffff8881ccda5348 R15: ffff8881ccda5280 FS: 00007efe52c27700(0000) GS:ffff8881db900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efe52c05e78 CR3: 00000001ccdf3003 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __fput+0x27d/0x6c0 fs/file_table.c:280 task_work_run+0x176/0x1a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:163 [inline] prepare_exit_to_usermode+0x286/0x2e0 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x446899 Code: e8 5c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 8b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007efe52c26db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9 RAX: 0000000000000000 RBX: 00000000006dbc58 RCX: 0000000000446899 RDX: 0000000000000006 RSI: 0000000000000001 RDI: 0000000000000007 RBP: 00000000006dbc50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000380 R11: 0000000000000246 R12: 00000000006dbc5c R13: 00007ffeaf98799f R14: 00007efe52c279c0 R15: 20c49ba5e353f7cf Modules linked in: RSP: 0018:ffff8881cc727da0 EFLAGS: 00010246 RBP: 0000000000005401 R08: ffffffff823c3e0c R09: ffffed10398e05a1 R13: 1ffff110399b4a69 R14: ffff8881ccda5348 R15: ffff8881ccda5280 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efe52c05e78 CR3: 00000001ccdf3003 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400