loop0: detected capacity change from 0 to 2048 UDF-fs: INFO Mounting volume 'LiuxUDF', timestamp 2022/11/22 14:59 (1000) ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: null-ptr-deref in test_and_set_bit_lock include/asm-generic/bitops/instrumented-lock.h:55 [inline] BUG: KASAN: null-ptr-deref in trylock_buffer include/linux/buffer_head.h:395 [inline] BUG: KASAN: null-ptr-deref in lock_buffer include/linux/buffer_head.h:401 [inline] BUG: KASAN: null-ptr-deref in udf_getblk fs/udf/inode.c:383 [inline] BUG: KASAN: null-ptr-deref in udf_bread+0x24c/0x4ec fs/udf/inode.c:1111 Write of size 8 at addr 0000000000000000 by task syz.0.16/5030 CPU: 1 PID: 5030 Comm: syz.0.16 Not tainted 5.15.185-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 __kasan_report mm/kasan/report.c:438 [inline] kasan_report+0xe0/0x15c mm/kasan/report.c:451 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x270/0x2b0 mm/kasan/generic.c:189 __kasan_check_write+0x44/0x54 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] test_and_set_bit_lock include/asm-generic/bitops/instrumented-lock.h:55 [inline] trylock_buffer include/linux/buffer_head.h:395 [inline] lock_buffer include/linux/buffer_head.h:401 [inline] udf_getblk fs/udf/inode.c:383 [inline] udf_bread+0x24c/0x4ec fs/udf/inode.c:1111 udf_fiiter_append_blk+0x2c0/0x6f8 fs/udf/directory.c:463 udf_fiiter_add_entry+0x94c/0x1658 fs/udf/namei.c:292 udf_mkdir+0x114/0x3b0 fs/udf/namei.c:436 vfs_mkdir+0x314/0x4d4 fs/namei.c:4065 do_mkdirat+0x1bc/0x508 fs/namei.c:4090 __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4103 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 ================================================================== Unable to handle kernel paging request at virtual address dfff800000000000 Mem abort info: ESR = 0x0000000096000006 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 = 0x00000006 CM = 0, WnR = 0 [dfff800000000000] address between user and kernel address ranges Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 5030 Comm: syz.0.16 Tainted: G B 5.15.185-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : arch_test_and_set_bit_lock include/asm-generic/bitops/lock.h:25 [inline] pc : test_and_set_bit_lock include/asm-generic/bitops/instrumented-lock.h:56 [inline] pc : trylock_buffer include/linux/buffer_head.h:395 [inline] pc : lock_buffer include/linux/buffer_head.h:401 [inline] pc : udf_getblk fs/udf/inode.c:383 [inline] pc : udf_bread+0x250/0x4ec fs/udf/inode.c:1111 lr : instrument_atomic_read_write include/linux/instrumented.h:101 [inline] lr : test_and_set_bit_lock include/asm-generic/bitops/instrumented-lock.h:55 [inline] lr : trylock_buffer include/linux/buffer_head.h:395 [inline] lr : lock_buffer include/linux/buffer_head.h:401 [inline] lr : udf_getblk fs/udf/inode.c:383 [inline] lr : udf_bread+0x24c/0x4ec fs/udf/inode.c:1111 sp : ffff80001fb373c0 x29: ffff80001fb37540 x28: ffff80001fb373e0 x27: 1ffff00003f66ebc x26: dfff800000000000 x25: ffff700003f66e7c x24: 0000000000000000 x23: 0000000000000030 x22: ffff0000e25f8180 x21: 0000000000000000 x20: ffff0000e25f8158 x19: ffff80001fb375e0 x18: 0000000000000002 x17: 0000000040000000 x16: ffff8000082d4c48 x15: 0000000000000002 x14: 0000000000ff0100 x13: ffffffffffffffff x12: 0000000000ff0100 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffff80000824419c x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800008184638 x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000000 Call trace: arch_test_and_set_bit_lock include/asm-generic/bitops/lock.h:25 [inline] test_and_set_bit_lock include/asm-generic/bitops/instrumented-lock.h:56 [inline] trylock_buffer include/linux/buffer_head.h:395 [inline] lock_buffer include/linux/buffer_head.h:401 [inline] udf_getblk fs/udf/inode.c:383 [inline] udf_bread+0x250/0x4ec fs/udf/inode.c:1111 udf_fiiter_append_blk+0x2c0/0x6f8 fs/udf/directory.c:463 udf_fiiter_add_entry+0x94c/0x1658 fs/udf/namei.c:292 udf_mkdir+0x114/0x3b0 fs/udf/namei.c:436 vfs_mkdir+0x314/0x4d4 fs/namei.c:4065 do_mkdirat+0x1bc/0x508 fs/namei.c:4090 __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4103 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Code: aa1503e0 52800101 97c42b08 d343feb8 (387a6b08) ---[ end trace 93cebd4b12a5bc17 ]--- ---------------- Code disassembly (best guess): 0: aa1503e0 mov x0, x21 4: 52800101 mov w1, #0x8 // #8 8: 97c42b08 bl 0xffffffffff10ac28 c: d343feb8 lsr x24, x21, #3 * 10: 387a6b08 ldrb w8, [x24, x26] <-- trapping instruction