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 ================================================================== 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.5.425/6326 CPU: 0 PID: 6326 Comm: syz.5.425 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_vn_update_time+0x3dc/0x62c fs/xfs/xfs_iops.c:1072 inode_update_time fs/inode.c:1868 [inline] touch_atime+0x434/0xa4c fs/inode.c:1941 file_accessed include/linux/fs.h:2523 [inline] filemap_read+0x1a40/0x1bd8 mm/filemap.c:2715 generic_file_read_iter+0xa0/0x3c4 mm/filemap.c:2794 xfs_file_buffered_read+0x1a0/0x3e0 fs/xfs/xfs_file.c:302 xfs_file_read_iter+0x250/0x564 fs/xfs/xfs_file.c:327 do_iter_readv_writev+0x420/0x5f8 do_iter_read+0x1c4/0x684 fs/read_write.c:790 vfs_readv fs/read_write.c:910 [inline] do_preadv+0x1e4/0x324 fs/read_write.c:1002 __do_sys_preadv fs/read_write.c:1052 [inline] __se_sys_preadv fs/read_write.c:1047 [inline] __arm64_sys_preadv+0xa0/0xb8 fs/read_write.c:1047 __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: 0 PID: 6326 Comm: syz.5.425 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 : ffff800022077040 x29: ffff800022077160 x28: dfff800000000000 x27: 1ffff0000440ee24 x26: 1fffe0001c0b4700 x25: 0000000000000000 x24: ffff0000e05a3790 x23: 0000000000000150 x22: dfff800000000000 x21: ffff0000e05a3800 x20: 0000000000000002 x19: dfff800000000000 x18: 1fffe0003682ef8e x17: 1fffe0003682ef8e x16: ffff800011b4b130 x15: ffff800014bffa40 x14: ffff0001b4177c80 x13: ffff0001b4177c7c 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_vn_update_time+0x3dc/0x62c fs/xfs/xfs_iops.c:1072 inode_update_time fs/inode.c:1868 [inline] touch_atime+0x434/0xa4c fs/inode.c:1941 file_accessed include/linux/fs.h:2523 [inline] filemap_read+0x1a40/0x1bd8 mm/filemap.c:2715 generic_file_read_iter+0xa0/0x3c4 mm/filemap.c:2794 xfs_file_buffered_read+0x1a0/0x3e0 fs/xfs/xfs_file.c:302 xfs_file_read_iter+0x250/0x564 fs/xfs/xfs_file.c:327 do_iter_readv_writev+0x420/0x5f8 do_iter_read+0x1c4/0x684 fs/read_write.c:790 vfs_readv fs/read_write.c:910 [inline] do_preadv+0x1e4/0x324 fs/read_write.c:1002 __do_sys_preadv fs/read_write.c:1052 [inline] __se_sys_preadv fs/read_write.c:1047 [inline] __arm64_sys_preadv+0xa0/0xb8 fs/read_write.c:1047 __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 0eef88de0faa2d9c ]--- ---------------- 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