RBP: 00007fff6eb4ad00 R08: 0000000000000002 R09: 00007fb6ab003931 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 8087 Comm: syz-executor804 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:cdev_del+0x22/0x90 fs/char_dev.c:602 Code: cf 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 ec 08 e8 b3 dc be ff 48 8d 7d 64 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 04 84 d2 75 4f 48 RSP: 0018:ffff888097fa7ba0 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffff8882388a6d00 RCX: ffffffff83b8674f RDX: 000000000000000c RSI: ffffffff81a3a8bd RDI: 0000000000000064 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000007 R11: 0000000000000000 R12: ffff8882388a6d08 R13: ffff8882389543c8 R14: ffff8880aa9e3700 R15: ffff8880b2bf44a8 FS: 00005555563cb300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffd2d11d87 CR3: 0000000097fd7000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tty_unregister_device drivers/tty/tty_io.c:3054 [inline] tty_unregister_device+0x112/0x1b0 drivers/tty/tty_io.c:3049 gsmld_detach_gsm drivers/tty/n_gsm.c:2289 [inline] gsmld_close+0xaa/0x1f0 drivers/tty/n_gsm.c:2358 tty_ldisc_close+0xa2/0xd0 drivers/tty/tty_ldisc.c:493 tty_ldisc_kill drivers/tty/tty_ldisc.c:639 [inline] tty_ldisc_release+0xf5/0x440 drivers/tty/tty_ldisc.c:806 tty_release_struct+0x20/0xe0 drivers/tty/tty_io.c:1611 tty_release+0xc70/0x1210 drivers/tty/tty_io.c:1784 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xbf3/0x2be0 kernel/exit.c:870 do_group_exit+0x125/0x310 kernel/exit.c:967 __do_sys_exit_group kernel/exit.c:978 [inline] __se_sys_exit_group kernel/exit.c:976 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:976 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fb6ab4b9389 Code: Bad RIP value. RSP: 002b:00007fff6eb4acd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fb6ab52d3f0 RCX: 00007fb6ab4b9389 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 00007fb6ab003931 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb6ab52d3f0 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 Modules linked in: ---[ end trace 4d69519d03474956 ]--- RIP: 0010:cdev_del+0x22/0x90 fs/char_dev.c:602 Code: cf 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 ec 08 e8 b3 dc be ff 48 8d 7d 64 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 04 84 d2 75 4f 48 RSP: 0018:ffff888097fa7ba0 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffff8882388a6d00 RCX: ffffffff83b8674f RDX: 000000000000000c RSI: ffffffff81a3a8bd RDI: 0000000000000064 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000007 R11: 0000000000000000 R12: ffff8882388a6d08 R13: ffff8882389543c8 R14: ffff8880aa9e3700 R15: ffff8880b2bf44a8 FS: 00005555563cb300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1e296bf740 CR3: 00000000b5090000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: cf iret 1: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 8: 55 push %rbp 9: 48 89 fd mov %rdi,%rbp c: 48 83 ec 08 sub $0x8,%rsp 10: e8 b3 dc be ff callq 0xffbedcc8 15: 48 8d 7d 64 lea 0x64(%rbp),%rdi 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction 2e: 48 89 f8 mov %rdi,%rax 31: 83 e0 07 and $0x7,%eax 34: 83 c0 03 add $0x3,%eax 37: 38 d0 cmp %dl,%al 39: 7c 04 jl 0x3f 3b: 84 d2 test %dl,%dl 3d: 75 4f jne 0x8e 3f: 48 rex.W