REISERFS warning (device loop4): vs-13060 reiserfs_update_sd_size: stat data of object [2 5 0x0 SD] (nlink == 1) not found (pos 4) ================================================================== BUG: KASAN: user-memory-access in scnprintf_cpu_key fs/reiserfs/prints.c:95 [inline] BUG: KASAN: user-memory-access in prepare_error_buf+0x1354/0x1840 fs/reiserfs/prints.c:229 Read of size 4 at addr 00000000ffffffff by task syz.4.311/5487 CPU: 0 PID: 5487 Comm: syz.4.311 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_report+0x40/0x68 mm/kasan/report.c:423 kasan_report+0xa8/0xfc mm/kasan/report.c:524 __asan_report_load4_noabort+0x2c/0x38 mm/kasan/report_generic.c:350 scnprintf_cpu_key fs/reiserfs/prints.c:95 [inline] prepare_error_buf+0x1354/0x1840 fs/reiserfs/prints.c:229 __reiserfs_error+0xdc/0x2a0 fs/reiserfs/prints.c:396 reiserfs_do_truncate+0x268/0x1058 fs/reiserfs/stree.c:1930 reiserfs_truncate_file+0x5d0/0xb00 fs/reiserfs/inode.c:2310 reiserfs_truncate_failed_write fs/reiserfs/inode.c:2743 [inline] reiserfs_write_begin+0x544/0x714 fs/reiserfs/inode.c:2808 generic_perform_write+0x234/0x4f4 mm/filemap.c:3862 __generic_file_write_iter+0x130/0x250 mm/filemap.c:3960 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:3989 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x3ec/0x7f0 fs/read_write.c:584 ksys_write+0x12c/0x224 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 ================================================================== Unable to handle kernel paging request at virtual address 00000000ffffffff Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005 CM = 0, WnR = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=0000000118b65000 [00000000ffffffff] pgd=080000011035a003, p4d=080000011035a003, pud=0000000000000000 Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 5487 Comm: syz.4.311 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : scnprintf_cpu_key fs/reiserfs/prints.c:95 [inline] pc : prepare_error_buf+0x7cc/0x1840 fs/reiserfs/prints.c:229 lr : scnprintf_cpu_key fs/reiserfs/prints.c:95 [inline] lr : prepare_error_buf+0x1354/0x1840 fs/reiserfs/prints.c:229 sp : ffff8000215d7240 x29: ffff8000215d73c0 x28: ffffffffffffffe2 x27: ffff80001c5a2b7e x26: ffff7000042bae58 x25: ffff80001c5a3a7e x24: 00000000ffffffff x23: 000000000000004b x22: ffff80001c5a3a60 x21: ffff80001c5a3a7f x20: ffff8000215d7420 x19: dfff800000000000 x18: ffff800011b8bf60 x17: 0000000000000000 x16: ffff80000804309c x15: 0000000000000002 x14: 0000000000000001 x13: 1ffff00002fbf96c x12: 0000000000080000 x11: 000000000007ffff x10: ffff800030f19000 x9 : 0000000000000000 x8 : ffff0000f7b35340 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff8000215d6c18 x4 : ffff8000152f4cc0 x3 : ffff800008193d00 x2 : 0000000000000001 x1 : 0000000000000000 x0 : 00000000ffffffff Call trace: scnprintf_cpu_key fs/reiserfs/prints.c:95 [inline] prepare_error_buf+0x7cc/0x1840 fs/reiserfs/prints.c:229 __reiserfs_error+0xdc/0x2a0 fs/reiserfs/prints.c:396 reiserfs_do_truncate+0x268/0x1058 fs/reiserfs/stree.c:1930 reiserfs_truncate_file+0x5d0/0xb00 fs/reiserfs/inode.c:2310 reiserfs_truncate_failed_write fs/reiserfs/inode.c:2743 [inline] reiserfs_write_begin+0x544/0x714 fs/reiserfs/inode.c:2808 generic_perform_write+0x234/0x4f4 mm/filemap.c:3862 __generic_file_write_iter+0x130/0x250 mm/filemap.c:3960 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:3989 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x3ec/0x7f0 fs/read_write.c:584 ksys_write+0x12c/0x224 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Code: d343ff08 38f36908 35005bc8 aa1803e0 (b8404408) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: d343ff08 lsr x8, x24, #3 4: 38f36908 ldrsb w8, [x8, x19] 8: 35005bc8 cbnz w8, 0xb80 c: aa1803e0 mov x0, x24 * 10: b8404408 ldr w8, [x0], #4 <-- trapping instruction