================================================================== 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 104 at addr 0000000000000000 by task syz.2.425/6311 CPU: 0 PID: 6311 Comm: syz.2.425 Not tainted 5.15.173-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_commit+0x24/0x34 fs/xfs/xfs_trans.c:925 xfs_bmapi_convert_delalloc+0xcac/0x1018 fs/xfs/libxfs/xfs_bmap.c:4663 xfs_convert_blocks fs/xfs/xfs_aops.c:245 [inline] xfs_map_blocks+0x858/0x1318 fs/xfs/xfs_aops.c:366 iomap_writepage_map fs/iomap/buffered-io.c:1320 [inline] iomap_do_writepage+0x538/0x1db8 fs/iomap/buffered-io.c:1485 write_cache_pages+0x878/0xf58 mm/page-writeback.c:2277 iomap_writepages+0x6c/0x1f4 fs/iomap/buffered-io.c:1516 xfs_vm_writepages+0x124/0x180 fs/xfs/xfs_aops.c:488 do_writepages+0x39c/0x5ec mm/page-writeback.c:2386 filemap_fdatawrite_wbc+0x1c8/0x228 mm/filemap.c:400 __filemap_fdatawrite_range+0x144/0x1ac mm/filemap.c:433 generic_fadvise+0x4f8/0x750 mm/fadvise.c:113 xfs_file_fadvise+0xb0/0xcc fs/xfs/xfs_file.c:1112 vfs_fadvise mm/fadvise.c:184 [inline] ksys_fadvise64_64 mm/fadvise.c:200 [inline] __do_sys_fadvise64_64 mm/fadvise.c:208 [inline] __se_sys_fadvise64_64 mm/fadvise.c:206 [inline] __arm64_sys_fadvise64_64+0x104/0x174 mm/fadvise.c:206 __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: 6311 Comm: syz.2.425 Tainted: G B 5.15.173-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 : ffff8000203c6c00 x29: ffff8000203c6d20 x28: dfff800000000000 x27: 1ffff00004078d9c x26: 1fffe0001bc55eb0 x25: 0000000000000000 x24: ffff0000de2af510 x23: 0000000000000228 x22: dfff800000000000 x21: ffff0000de2af580 x20: 0000000000000003 x19: dfff800000000000 x18: 1fffe0003683318e x17: 1fffe0003683318e x16: ffff800011b4b130 x15: ffff800014bffa40 x14: ffff0001b4198c80 x13: ffff0001b4198c7c x12: ffff700002e38164 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : 0000000000000003 x7 : 0000000000000000 x6 : ffff80000826abc8 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_commit+0x24/0x34 fs/xfs/xfs_trans.c:925 xfs_bmapi_convert_delalloc+0xcac/0x1018 fs/xfs/libxfs/xfs_bmap.c:4663 xfs_convert_blocks fs/xfs/xfs_aops.c:245 [inline] xfs_map_blocks+0x858/0x1318 fs/xfs/xfs_aops.c:366 iomap_writepage_map fs/iomap/buffered-io.c:1320 [inline] iomap_do_writepage+0x538/0x1db8 fs/iomap/buffered-io.c:1485 write_cache_pages+0x878/0xf58 mm/page-writeback.c:2277 iomap_writepages+0x6c/0x1f4 fs/iomap/buffered-io.c:1516 xfs_vm_writepages+0x124/0x180 fs/xfs/xfs_aops.c:488 do_writepages+0x39c/0x5ec mm/page-writeback.c:2386 filemap_fdatawrite_wbc+0x1c8/0x228 mm/filemap.c:400 __filemap_fdatawrite_range+0x144/0x1ac mm/filemap.c:433 generic_fadvise+0x4f8/0x750 mm/fadvise.c:113 xfs_file_fadvise+0xb0/0xcc fs/xfs/xfs_file.c:1112 vfs_fadvise mm/fadvise.c:184 [inline] ksys_fadvise64_64 mm/fadvise.c:200 [inline] __do_sys_fadvise64_64 mm/fadvise.c:208 [inline] __se_sys_fadvise64_64 mm/fadvise.c:206 [inline] __arm64_sys_fadvise64_64+0x104/0x174 mm/fadvise.c:206 __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 ba978ae212d44be9 ]--- ---------------- 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