Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Mem abort info: ESR = 0x0000000086000006 EC = 0x21: IABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault user pgtable: 4k pages, 48-bit VAs, pgdp=000000013e543000 [0000000000000000] pgd=080000013e93d003, p4d=080000013e93d003, pud=080000013b70d003, pmd=0000000000000000 Internal error: Oops: 86000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 6806 Comm: syz-executor.4 Not tainted 6.0.0-rc2-syzkaller-16455-ga41a877bc12d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : 0x0 lr : gsmld_receive_buf+0x140/0x214 drivers/tty/n_gsm.c:2861 sp : ffff80001360bcb0 x29: ffff80001360bcc0 x28: 0000000000000000 x27: 0000000000000000 x26: 0000000000000000 x25: 0000000000000000 x24: ffff80000d937000 x23: ffff80000d681e40 x22: ffff0000fe8c5800 x21: ffff80001360bd21 x20: ffff80000c205988 x19: ffff80001360bd24 x18: 00000000000000c0 x17: ffff80000dd7a698 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000002 x13: 0000000000000004 x12: 0000000000040000 x11: 0000000000000958 x10: ffff800017c79000 x9 : ffff8000098e7e04 x8 : 0000000000000000 x7 : ffff8000098dcea4 x6 : 0000000000000000 x5 : 0000000000000020 x4 : ffff80001360ba00 x3 : 0000000000000001 x2 : ffff80001360bd20 x1 : 0000000000000000 x0 : ffff0000fe8c5800 Call trace: 0x0 tiocsti+0x168/0x1c4 drivers/tty/tty_io.c:2293 tty_ioctl+0x284/0x9f4 drivers/tty/tty_io.c:2692 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xd0/0x140 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x154 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:624 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 el0t_64_sync+0x18c/0x190 Code: bad PC value ---[ end trace 0000000000000000 ]---