================================================================== 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+0x254/0x1b7c fs/xfs/xfs_log_cil.c:1264 Write of size 104 at addr 0000000000000000 by task syz.1.745/6927 CPU: 1 PID: 6927 Comm: syz.1.745 Not tainted 5.15.186-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 memset+0x58/0x88 mm/kasan/shadow.c:44 xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:225 [inline] xlog_cil_commit+0x254/0x1b7c fs/xfs/xfs_log_cil.c:1264 __xfs_trans_commit+0x628/0xcd4 fs/xfs/xfs_trans.c:881 xfs_trans_commit+0x24/0x34 fs/xfs/xfs_trans.c:925 xfs_bmapi_convert_delalloc+0xa08/0xca0 fs/xfs/libxfs/xfs_bmap.c:4663 xfs_convert_blocks fs/xfs/xfs_aops.c:245 [inline] xfs_map_blocks+0x784/0x11c4 fs/xfs/xfs_aops.c:366 iomap_writepage_map fs/iomap/buffered-io.c:1320 [inline] iomap_do_writepage+0x4f0/0x1c6c fs/iomap/buffered-io.c:1485 write_cache_pages+0x7c8/0xde4 mm/page-writeback.c:2277 iomap_writepages+0x6c/0x1f4 fs/iomap/buffered-io.c:1516 xfs_vm_writepages+0x120/0x17c fs/xfs/xfs_aops.c:488 do_writepages+0x36c/0x578 mm/page-writeback.c:2386 filemap_fdatawrite_wbc+0x1d4/0x234 mm/filemap.c:400 __filemap_fdatawrite_range mm/filemap.c:433 [inline] filemap_write_and_wait_range+0xe0/0x19c mm/filemap.c:704 xfs_flush_unmap_range+0xb8/0x110 fs/xfs/xfs_bmap_util.c:949 xfs_file_fallocate+0x1d8/0x960 fs/xfs/xfs_file.c:951 vfs_fallocate+0x4a4/0x5f4 fs/open.c:308 madvise_remove mm/madvise.c:928 [inline] madvise_vma mm/madvise.c:992 [inline] do_madvise+0x1044/0x26ec mm/madvise.c:1207 __do_sys_madvise mm/madvise.c:1233 [inline] __se_sys_madvise mm/madvise.c:1231 [inline] __arm64_sys_madvise+0xa4/0xc0 mm/madvise.c:1231 __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 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: 6927 Comm: syz.1.745 Tainted: G B 5.15.186-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 : xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:227 [inline] pc : xlog_cil_commit+0x25c/0x1b7c 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+0x254/0x1b7c fs/xfs/xfs_log_cil.c:1264 sp : ffff80001f7d6800 x29: ffff80001f7d6900 x28: 0000000000000228 x27: 0000000000000003 x26: 0000000000000000 x25: ffff0000de44bd00 x24: ffff0000de44bc90 x23: ffff80001f7d68a0 x22: 1fffe0001bc897a0 x21: 0000000000000003 x20: ffff0000de44bc80 x19: dfff800000000000 x18: 1fffe0003421a996 x17: 1fffe0003421a996 x16: ffff8000082d6448 x15: ffff80001421eda0 x14: ffff0001a10d4cc0 x13: ffff0001a10d4cbc x12: 0000000000ff0100 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : 0000000000000003 x7 : 0000000000000000 x6 : ffff80000824599c x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800008185e38 x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000018 Call trace: xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:227 [inline] xlog_cil_commit+0x25c/0x1b7c fs/xfs/xfs_log_cil.c:1264 __xfs_trans_commit+0x628/0xcd4 fs/xfs/xfs_trans.c:881 xfs_trans_commit+0x24/0x34 fs/xfs/xfs_trans.c:925 xfs_bmapi_convert_delalloc+0xa08/0xca0 fs/xfs/libxfs/xfs_bmap.c:4663 xfs_convert_blocks fs/xfs/xfs_aops.c:245 [inline] xfs_map_blocks+0x784/0x11c4 fs/xfs/xfs_aops.c:366 iomap_writepage_map fs/iomap/buffered-io.c:1320 [inline] iomap_do_writepage+0x4f0/0x1c6c fs/iomap/buffered-io.c:1485 write_cache_pages+0x7c8/0xde4 mm/page-writeback.c:2277 iomap_writepages+0x6c/0x1f4 fs/iomap/buffered-io.c:1516 xfs_vm_writepages+0x120/0x17c fs/xfs/xfs_aops.c:488 do_writepages+0x36c/0x578 mm/page-writeback.c:2386 filemap_fdatawrite_wbc+0x1d4/0x234 mm/filemap.c:400 __filemap_fdatawrite_range mm/filemap.c:433 [inline] filemap_write_and_wait_range+0xe0/0x19c mm/filemap.c:704 xfs_flush_unmap_range+0xb8/0x110 fs/xfs/xfs_bmap_util.c:949 xfs_file_fallocate+0x1d8/0x960 fs/xfs/xfs_file.c:951 vfs_fallocate+0x4a4/0x5f4 fs/open.c:308 madvise_remove mm/madvise.c:928 [inline] madvise_vma mm/madvise.c:992 [inline] do_madvise+0x1044/0x26ec mm/madvise.c:1207 __do_sys_madvise mm/madvise.c:1233 [inline] __se_sys_madvise mm/madvise.c:1231 [inline] __arm64_sys_madvise+0xa4/0xc0 mm/madvise.c:1231 __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: 93407d02 97b87cb0 91006340 d343fc08 (38736908) ---[ end trace 65a2596043d4f984 ]--- ---------------- Code disassembly (best guess): 0: 93407d02 sxtw x2, w8 4: 97b87cb0 bl 0xfffffffffee1f2c4 8: 91006340 add x0, x26, #0x18 c: d343fc08 lsr x8, x0, #3 * 10: 38736908 ldrb w8, [x8, x19] <-- trapping instruction