el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 ================================================================== 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 88 at addr 0000000000000000 by task syz.0.439/5852 CPU: 1 PID: 5852 Comm: syz.0.439 Not tainted 5.15.183-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_vn_update_time+0x378/0x570 fs/xfs/xfs_iops.c:1072 inode_update_time fs/inode.c:1893 [inline] file_update_time+0x2fc/0x390 fs/inode.c:2083 file_modified+0x74/0xb4 fs/inode.c:2106 xfs_file_write_checks+0x684/0x9ec fs/xfs/xfs_file.c:446 xfs_file_buffered_write+0x12c/0x99c fs/xfs/xfs_file.c:745 xfs_file_write_iter+0x2b0/0x5fc fs/xfs/xfs_file.c:833 do_iter_readv_writev+0x3a0/0x4f8 fs/read_write.c:-1 do_iter_write+0x1c4/0x670 fs/read_write.c:855 vfs_iter_write+0x88/0xac fs/read_write.c:896 iter_file_splice_write+0x504/0xa1c fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0xe4/0x134 fs/splice.c:936 splice_direct_to_actor+0x3e4/0x950 fs/splice.c:891 do_splice_direct+0x158/0x248 fs/splice.c:979 do_sendfile+0x458/0xc88 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1317 [inline] __se_sys_sendfile64 fs/read_write.c:1303 [inline] __arm64_sys_sendfile64+0x130/0x3b0 fs/read_write.c:1303 __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: 5852 Comm: syz.0.439 Tainted: G B 5.15.183-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 : ffff80001f8e6d00 x29: ffff80001f8e6e00 x28: 0000000000000150 x27: 0000000000000002 x26: 0000000000000000 x25: ffff0000dd2b4300 x24: ffff0000dd2b4290 x23: ffff80001f8e6da0 x22: 1fffe0001ba56860 x21: 0000000000000002 x20: ffff0000dd2b4280 x19: dfff800000000000 x18: 0000000000000002 x17: 0000000040000000 x16: ffff8000082d4b38 x15: 0000000000000002 x14: 0000000000ff0100 x13: ffffffffffffffff x12: 0000000000ff0100 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : 0000000000000003 x7 : 0000000000000000 x6 : ffff80000824408c x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800008184528 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_vn_update_time+0x378/0x570 fs/xfs/xfs_iops.c:1072 inode_update_time fs/inode.c:1893 [inline] file_update_time+0x2fc/0x390 fs/inode.c:2083 file_modified+0x74/0xb4 fs/inode.c:2106 xfs_file_write_checks+0x684/0x9ec fs/xfs/xfs_file.c:446 xfs_file_buffered_write+0x12c/0x99c fs/xfs/xfs_file.c:745 xfs_file_write_iter+0x2b0/0x5fc fs/xfs/xfs_file.c:833 do_iter_readv_writev+0x3a0/0x4f8 fs/read_write.c:-1 do_iter_write+0x1c4/0x670 fs/read_write.c:855 vfs_iter_write+0x88/0xac fs/read_write.c:896 iter_file_splice_write+0x504/0xa1c fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0xe4/0x134 fs/splice.c:936 splice_direct_to_actor+0x3e4/0x950 fs/splice.c:891 do_splice_direct+0x158/0x248 fs/splice.c:979 do_sendfile+0x458/0xc88 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1317 [inline] __se_sys_sendfile64 fs/read_write.c:1303 [inline] __arm64_sys_sendfile64+0x130/0x3b0 fs/read_write.c:1303 __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 97b87e64 91006340 d343fc08 (38736908) ---[ end trace 5395baefc9e97c22 ]--- ---------------- Code disassembly (best guess): 0: 93407d02 sxtw x2, w8 4: 97b87e64 bl 0xfffffffffee1f994 8: 91006340 add x0, x26, #0x18 c: d343fc08 lsr x8, x0, #3 * 10: 38736908 ldrb w8, [x8, x19] <-- trapping instruction