loop0: detected capacity change from 0 to 2048 UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/09/12 12:00 (1000) Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 Mem abort info: ESR = 0x0000000096000046 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000046 CM = 0, WnR = 1 user pgtable: 4k pages, 48-bit VAs, pgdp=0000000109085000 [0000000000000020] pgd=0800000106b68003, p4d=0800000106b68003, pud=0800000106b69003, pmd=0000000000000000 Internal error: Oops: 0000000096000046 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 3036 Comm: syz-executor863 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __memset+0x84/0x188 arch/arm64/lib/memset.S:100 lr : udf_write_fi+0x268/0x4e0 sp : ffff800012a53a50 x29: ffff800012a53a70 x28: 00000000000000d6 x27: 00000000000000d6 x26: 00000000fffffff0 x25: 0000000000000000 x24: 0000000000000006 x23: 00000000ffffffd4 x22: fffffffffffffff4 x21: ffff800012a53b40 x20: ffff800012a53b00 x19: 0000000000000003 x18: 0000000000000021 x17: 0000000000000000 x16: ffff80000db49158 x15: ffff0000c6401a80 x14: 0000000000000010 x13: 0000000000000000 x12: ffff0000c6401a80 x11: ff80800008d1bd1c x10: 0000000000000000 x9 : ffff800008d1bd1c x8 : 0000000000000020 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000010 x2 : ffffffffffffffd4 x1 : 0000000000000000 x0 : 0000000000000020 Call trace: __memset+0x84/0x188 arch/arm64/lib/memset.S:98 udf_delete_entry fs/udf/namei.c:577 [inline] udf_rename+0x47c/0x6d0 fs/udf/namei.c:1173 vfs_rename+0x59c/0x7f8 fs/namei.c:4756 do_renameat2+0x490/0x758 fs/namei.c:4907 __do_sys_renameat2 fs/namei.c:4940 [inline] __se_sys_renameat2 fs/namei.c:4937 [inline] __arm64_sys_renameat2+0x6c/0x88 fs/namei.c:4937 __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+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Code: 54000060 5400006b a8811d07 a8811d07 (a8811d07) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 54000060 b.eq 0xc // b.none 4: 5400006b b.lt 0x10 // b.tstop 8: a8811d07 stp x7, x7, [x8], #16 c: a8811d07 stp x7, x7, [x8], #16 * 10: a8811d07 stp x7, x7, [x8], #16 <-- trapping instruction