R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe3db390bf R14: 00007f13f9994300 R15: 0000000000022000
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: 1 PID: 22635 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
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:ffff888091bbfc50 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff888238852e00 RCX: ffffffff83b8674f
RDX: 000000000000000c RSI: ffffffff81a3a8bd RDI: 0000000000000064
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: ffff888238852e08
R13: ffff8882388fb6c8 R14: ffff88804f810ee8 R15: ffff8880af279800
FS:  000055555635e400(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f422000 CR3: 000000009175d000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000100000000 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_hangup+0x2a1/0x700 drivers/tty/tty_ldisc.c:757
 __tty_hangup.part.0+0x359/0x780 drivers/tty/tty_io.c:623
 __tty_hangup drivers/tty/tty_io.c:573 [inline]
 tty_vhangup+0x1d/0x30 drivers/tty/tty_io.c:696
 pty_close+0x3a1/0x4f0 drivers/tty/pty.c:79
 tty_release+0x45e/0x1210 drivers/tty/tty_io.c:1678
 __fput+0x2ce/0x890 fs/file_table.c:278
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f17e704237b
Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44
RSP: 002b:00007ffe0109e8d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f17e704237b
RDX: 0000001b2f920000 RSI: 0000001b2f9228d8 RDI: 0000000000000003
RBP: 00007f17e71b2980 R08: 0000000000000000 R09: 0000000047d6f7bf
R10: 0002cf91a4baccaa R11: 0000000000000293 R12: 0000000000148e0f
R13: 00007ffe0109e9d0 R14: 00007ffe0109e9f0 R15: 0000000000000032
Modules linked in:
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
---[ end trace 3f2f441adea35c65 ]---
RIP: 0010:cdev_del+0x22/0x90 fs/char_dev.c:602
CPU: 1 PID: 23064 Comm: syz-executor.1 Tainted: G      D           4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0xa/0xf lib/fault-inject.c:149
 __should_failslab+0x115/0x180 mm/failslab.c:32
 should_failslab+0x5/0x10 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc_node mm/slab.c:3304 [inline]
 kmem_cache_alloc_node_trace+0x244/0x3b0 mm/slab.c:3666
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
 kmalloc_node include/linux/slab.h:553 [inline]
 kzalloc_node include/linux/slab.h:720 [inline]
 __get_vm_area_node+0x128/0x3a0 mm/vmalloc.c:1394
 __vmalloc_node_range mm/vmalloc.c:1748 [inline]
 __vmalloc_node mm/vmalloc.c:1804 [inline]
 __vmalloc_node_flags mm/vmalloc.c:1818 [inline]
 vzalloc+0xe6/0x1a0 mm/vmalloc.c:1857
 n_tty_open+0x16/0x160 drivers/tty/n_tty.c:1912
 tty_ldisc_open+0x81/0xc0 drivers/tty/tty_ldisc.c:469
 tty_ldisc_failto+0x13b/0x1a0 drivers/tty/tty_ldisc.c:515
 tty_ldisc_restore drivers/tty/tty_ldisc.c:532 [inline]
 tty_set_ldisc+0x4db/0x650 drivers/tty/tty_ldisc.c:598
 tiocsetd drivers/tty/tty_io.c:2359 [inline]
 tty_ioctl+0xb4b/0x1630 drivers/tty/tty_io.c:2603
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f13fb4215a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 0018:ffff888091bbfc50 EFLAGS: 00010207
RSP: 002b:00007f13f9994168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f13fb541f80 RCX: 00007f13fb4215a9
RDX: 0000000020000040 RSI: 0000000000005423 RDI: 0000000000000004
RBP: 00007f13f99941d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe3db390bf R14: 00007f13f9994300 R15: 0000000000022000
RAX: dffffc0000000000 RBX: ffff888238852e00 RCX: ffffffff83b8674f
RDX: 000000000000000c RSI: ffffffff81a3a8bd RDI: 0000000000000064
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: ffff888238852e08
R13: ffff8882388fb6c8 R14: ffff88804f810ee8 R15: ffff8880af279800
FS:  000055555635e400(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc945ecff8 CR3: 000000009175d000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000100000000 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