================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:102 [inline] BUG: KASAN: null-ptr-deref in test_and_set_bit_lock include/asm-generic/bitops/instrumented-lock.h:57 [inline] BUG: KASAN: null-ptr-deref in trylock_buffer include/linux/buffer_head.h:390 [inline] BUG: KASAN: null-ptr-deref in lock_buffer include/linux/buffer_head.h:396 [inline] BUG: KASAN: null-ptr-deref in udf_getblk fs/udf/inode.c:474 [inline] BUG: KASAN: null-ptr-deref in udf_bread+0x29f/0x4b0 fs/udf/inode.c:1202 Write of size 8 at addr 0000000000000000 by task syz.1.1848/10951 CPU: 1 PID: 10951 Comm: syz.1.1848 Not tainted 6.1.110-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_report+0xe6/0x4f0 mm/kasan/report.c:398 kasan_report+0x136/0x160 mm/kasan/report.c:495 kasan_check_range+0x27f/0x290 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:102 [inline] test_and_set_bit_lock include/asm-generic/bitops/instrumented-lock.h:57 [inline] trylock_buffer include/linux/buffer_head.h:390 [inline] lock_buffer include/linux/buffer_head.h:396 [inline] udf_getblk fs/udf/inode.c:474 [inline] udf_bread+0x29f/0x4b0 fs/udf/inode.c:1202 udf_add_entry+0x1d1e/0x3350 fs/udf/namei.c:495 udf_add_nondir+0x132/0x5d0 fs/udf/namei.c:588 vfs_create+0x306/0x490 fs/namei.c:3186 do_mknodat+0x338/0x5a0 fs/namei.c:4037 __do_sys_mknod fs/namei.c:4070 [inline] __se_sys_mknod fs/namei.c:4068 [inline] __x64_sys_mknod+0x8a/0xa0 fs/namei.c:4068 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f55bcb7def9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f55bc9ff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000085 RAX: ffffffffffffffda RBX: 00007f55bcd36058 RCX: 00007f55bcb7def9 RDX: 0000000000000703 RSI: 0000000000000000 RDI: 0000000020000000 RBP: 00007f55bcbf0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f55bcd36058 R15: 00007ffd8452d798 ==================================================================