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 Modules linked in: CPU: 0 PID: 19858 Comm: syz-executor.3 Not tainted 4.14.290-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 task: ffff88809aa86580 task.stack: ffff888092490000 RIP: 0010:cdev_del+0x22/0x90 fs/char_dev.c:602 RSP: 0018:ffff888092497ca0 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffff8880b0b2d800 RCX: 0000000000000000 FAULT_INJECTION: forcing a failure. name fail_page_alloc, interval 1, probability 0, space 0, times 0 RDX: 000000000000000c RSI: ffff88809aa86e30 RDI: 0000000000000064 CPU: 1 PID: 19979 Comm: syz-executor.2 Not tainted 4.14.290-syzkaller #0 RBP: 0000000000000000 R08: ffffffff8b9dc180 R09: 0000000000000000 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880b0b2d808 Call Trace: R13: ffff8880af76c888 R14: ffff8880a194a000 R15: ffff88808de08a58 __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 FS: 000055555564d400(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10a/0x149 lib/fault-inject.c:149 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 should_fail_alloc_page mm/page_alloc.c:2898 [inline] prepare_alloc_pages mm/page_alloc.c:4131 [inline] __alloc_pages_nodemask+0x22c/0x2720 mm/page_alloc.c:4179 CR2: 00007ff9760cf000 CR3: 00000000abcda000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tty_unregister_device drivers/tty/tty_io.c:3046 [inline] tty_unregister_device+0x101/0x1a0 drivers/tty/tty_io.c:3041 gsmld_detach_gsm drivers/tty/n_gsm.c:2309 [inline] gsmld_close+0xaa/0x1f0 drivers/tty/n_gsm.c:2378 tty_ldisc_close+0x8c/0xc0 drivers/tty/tty_ldisc.c:505 tty_ldisc_kill drivers/tty/tty_ldisc.c:651 [inline] tty_ldisc_release+0xe8/0x400 drivers/tty/tty_ldisc.c:818 tty_release_struct+0x20/0xe0 drivers/tty/tty_io.c:1603 tty_release+0xb3f/0x10d0 drivers/tty/tty_io.c:1776 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 __alloc_pages include/linux/gfp.h:484 [inline] __alloc_pages_node include/linux/gfp.h:497 [inline] kmem_getpages mm/slab.c:1419 [inline] cache_grow_begin+0x91/0x700 mm/slab.c:2676 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f363be66e4b cache_alloc_refill+0x273/0x350 mm/slab.c:3043 RSP: 002b:00007ffd2c69e5e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 ____cache_alloc mm/slab.c:3125 [inline] __do_cache_alloc mm/slab.c:3347 [inline] slab_alloc mm/slab.c:3382 [inline] __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x378/0x400 mm/slab.c:3729 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f363be66e4b kmalloc include/linux/slab.h:493 [inline] __kfifo_alloc+0xdc/0x240 lib/kfifo.c:57 RDX: 0000000000000000 RSI: 0000001b303215cc RDI: 0000000000000003 gsm_dlci_alloc+0xd4/0x460 drivers/tty/n_gsm.c:1673 RBP: 00007f363bfc8960 R08: 0000000000000000 R09: 00000000c07cd304 gsm_activate_mux+0x22e/0x2e0 drivers/tty/n_gsm.c:2159 R10: 0000000000000000 R11: 0000000000000293 R12: 000000000028332e gsmld_attach_gsm drivers/tty/n_gsm.c:2280 [inline] gsmld_open+0x4ed/0x7b0 drivers/tty/n_gsm.c:2414 R13: 00007ffd2c69e6e0 R14: 00007ffd2c69e700 R15: 0000000000000032 Code: tty_ldisc_open+0x6c/0xb0 drivers/tty/tty_ldisc.c:481 05 tty_set_ldisc+0x287/0x5d0 drivers/tty/tty_ldisc.c:606 3e tiocsetd drivers/tty/tty_io.c:2351 [inline] tty_ioctl+0xa2a/0x1430 drivers/tty/tty_io.c:2595 f7 ff eb d2 0f 1f 00 55 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 48 89 fd 48 83 ec SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 08 e8 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 e3 entry_SYSCALL_64_after_hwframe+0x46/0xbb 87 RIP: 0033:0x7f516097a209 cd RSP: 002b:00007f515f2ef168 EFLAGS: 00000246 ff ORIG_RAX: 0000000000000010 48 RAX: ffffffffffffffda RBX: 00007f5160a8cf60 RCX: 00007f516097a209 8d RDX: 00000000200000c0 RSI: 0000000000005423 RDI: 0000000000000003 7d RBP: 00007f515f2ef1d0 R08: 0000000000000000 R09: 0000000000000000 64 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 48 R13: 00007ffffedb792f R14: 00007f515f2ef300 R15: 0000000000022000 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 RIP: cdev_del+0x22/0x90 fs/char_dev.c:602 RSP: ffff888092497ca0 ---[ end trace e438f68c20a0165c ]---