================================================================== BUG: KASAN: null-ptr-deref in xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:225 [inline] BUG: KASAN: null-ptr-deref in xlog_cil_commit+0x2f4/0x1fe4 fs/xfs/xfs_log_cil.c:1264 Write of size 88 at addr 0000000000000000 by task syz.5.135/4894 CPU: 0 PID: 4894 Comm: syz.5.135 Not tainted 5.15.176-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 __kasan_report mm/kasan/report.c:438 [inline] kasan_report+0x168/0x1e4 mm/kasan/report.c:451 kasan_check_range+0x274/0x2b4 mm/kasan/generic.c:189 memset+0x58/0x88 mm/kasan/shadow.c:44 xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:225 [inline] xlog_cil_commit+0x2f4/0x1fe4 fs/xfs/xfs_log_cil.c:1264 __xfs_trans_commit+0x740/0xe98 fs/xfs/xfs_trans.c:881 xfs_trans_roll+0x1c4/0x5cc fs/xfs/xfs_trans.c:1009 xfs_defer_trans_roll+0x4a4/0xb1c fs/xfs/libxfs/xfs_defer.c:297 xfs_defer_finish_noroll+0x40c/0x1f34 fs/xfs/libxfs/xfs_defer.c:483 __xfs_trans_commit+0x460/0xe98 fs/xfs/xfs_trans.c:852 xfs_trans_commit+0x24/0x34 fs/xfs/xfs_trans.c:925 xfs_reflink_fill_cow_hole fs/xfs/xfs_reflink.c:427 [inline] xfs_reflink_allocate_cow+0x994/0xb88 fs/xfs/xfs_reflink.c:549 xfs_direct_write_iomap_begin+0x4ec/0x1000 fs/xfs/xfs_iomap.c:763 xfs_buffered_write_iomap_begin+0x294/0x16d0 fs/xfs/xfs_iomap.c:882 iomap_iter+0x5f0/0xffc fs/iomap/iter.c:74 iomap_zero_range+0x140/0x5bc fs/iomap/buffered-io.c:942 xfs_setattr_size+0x33c/0xc00 fs/xfs/xfs_iops.c:846 xfs_vn_setattr_size+0x1cc/0x3d8 fs/xfs/xfs_iops.c:997 xfs_vn_setattr+0x1c0/0x524 fs/xfs/xfs_iops.c:1022 notify_change+0xa34/0xcf8 fs/attr.c:505 do_truncate+0x1c0/0x28c fs/open.c:65 do_sys_ftruncate+0x288/0x31c fs/open.c:193 __do_sys_ftruncate fs/open.c:204 [inline] __se_sys_ftruncate fs/open.c:202 [inline] __arm64_sys_ftruncate+0x60/0x74 fs/open.c:202 __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+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 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 dfff800000000003 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 [dfff800000000003] address between user and kernel address ranges Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 4894 Comm: syz.5.135 Tainted: G B 5.15.176-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:227 [inline] pc : xlog_cil_commit+0x304/0x1fe4 fs/xfs/xfs_log_cil.c:1264 lr : xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:225 [inline] lr : xlog_cil_commit+0x2f4/0x1fe4 fs/xfs/xfs_log_cil.c:1264 sp : ffff800020366860 x29: ffff800020366980 x28: dfff800000000000 x27: 1ffff0000406cd28 x26: 1fffe0001d8be010 x25: 0000000000000000 x24: ffff0000ec5f0010 x23: 0000000000000268 x22: dfff800000000000 x21: ffff0000ec5f0080 x20: 0000000000000002 x19: dfff800000000000 x18: 1fffe0003683318e x17: 1fffe0003683318e x16: ffff800011b4b268 x15: ffff800014bffac0 x14: ffff0001b4198c80 x13: ffff0001b4198c7c x12: ffff700002e38564 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : 0000000000000003 x7 : 0000000000000000 x6 : ffff80000826abdc x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff80000819c3ec x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000018 Call trace: xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:227 [inline] xlog_cil_commit+0x304/0x1fe4 fs/xfs/xfs_log_cil.c:1264 __xfs_trans_commit+0x740/0xe98 fs/xfs/xfs_trans.c:881 xfs_trans_roll+0x1c4/0x5cc fs/xfs/xfs_trans.c:1009 xfs_defer_trans_roll+0x4a4/0xb1c fs/xfs/libxfs/xfs_defer.c:297 xfs_defer_finish_noroll+0x40c/0x1f34 fs/xfs/libxfs/xfs_defer.c:483 __xfs_trans_commit+0x460/0xe98 fs/xfs/xfs_trans.c:852 xfs_trans_commit+0x24/0x34 fs/xfs/xfs_trans.c:925 xfs_reflink_fill_cow_hole fs/xfs/xfs_reflink.c:427 [inline] xfs_reflink_allocate_cow+0x994/0xb88 fs/xfs/xfs_reflink.c:549 xfs_direct_write_iomap_begin+0x4ec/0x1000 fs/xfs/xfs_iomap.c:763 xfs_buffered_write_iomap_begin+0x294/0x16d0 fs/xfs/xfs_iomap.c:882 iomap_iter+0x5f0/0xffc fs/iomap/iter.c:74 iomap_zero_range+0x140/0x5bc fs/iomap/buffered-io.c:942 xfs_setattr_size+0x33c/0xc00 fs/xfs/xfs_iops.c:846 xfs_vn_setattr_size+0x1cc/0x3d8 fs/xfs/xfs_iops.c:997 xfs_vn_setattr+0x1c0/0x524 fs/xfs/xfs_iops.c:1022 notify_change+0xa34/0xcf8 fs/attr.c:505 do_truncate+0x1c0/0x28c fs/open.c:65 do_sys_ftruncate+0x288/0x31c fs/open.c:193 __do_sys_ftruncate fs/open.c:204 [inline] __se_sys_ftruncate fs/open.c:202 [inline] __arm64_sys_ftruncate+0x60/0x74 fs/open.c:202 __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+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Code: 91006320 d2d00016 d343fc08 f2fbfff6 (38736908) ---[ end trace c0abf30e947e43b6 ]--- ---------------- Code disassembly (best guess): 0: 91006320 add x0, x25, #0x18 4: d2d00016 mov x22, #0x800000000000 // #140737488355328 8: d343fc08 lsr x8, x0, #3 c: f2fbfff6 movk x22, #0xdfff, lsl #48 * 10: 38736908 ldrb w8, [x8, x19] <-- trapping instruction