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 ================================================================== 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.2.107/4661 CPU: 1 PID: 4661 Comm: syz.2.107 Not tainted 5.15.185-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_roll+0x1c4/0x55c fs/xfs/xfs_trans.c:1009 xfs_defer_trans_roll+0x4a8/0xa88 fs/xfs/libxfs/xfs_defer.c:297 xfs_defer_finish_noroll+0x3a4/0x1d58 fs/xfs/libxfs/xfs_defer.c:483 __xfs_trans_commit+0x2a8/0xcd4 fs/xfs/xfs_trans.c:852 xfs_trans_commit+0x24/0x34 fs/xfs/xfs_trans.c:925 xfs_reflink_fill_cow_hole fs/xfs/xfs_reflink.c:427 [inline] xfs_reflink_allocate_cow+0x748/0x834 fs/xfs/xfs_reflink.c:549 xfs_direct_write_iomap_begin+0x43c/0xba4 fs/xfs/xfs_iomap.c:763 xfs_buffered_write_iomap_begin+0x298/0x1914 fs/xfs/xfs_iomap.c:882 iomap_iter+0x5ec/0xf20 fs/iomap/iter.c:74 iomap_file_buffered_write+0x154/0x4f0 fs/iomap/buffered-io.c:814 xfs_file_buffered_write+0x320/0x99c fs/xfs/xfs_file.c:753 xfs_file_write_iter+0x2b0/0x5fc fs/xfs/xfs_file.c:833 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7c8/0xa2c fs/read_write.c:594 ksys_write+0x120/0x210 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:656 __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: 4661 Comm: syz.2.107 Tainted: G B 5.15.185-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 : ffff80001fdd6a60 x29: ffff80001fdd6b60 x28: 0000000000000228 x27: 0000000000000003 x26: 0000000000000000 x25: ffff0000df2a5940 x24: ffff0000df2a58d0 x23: ffff80001fdd6b00 x22: 1fffe0001be54b28 x21: 0000000000000003 x20: ffff0000df2a58c0 x19: dfff800000000000 x18: 1fffe0003422158e x17: 1fffe0003422158e x16: ffff8000082d4c48 x15: ffff8000141fec20 x14: ffff0001a110ac80 x13: ffff0001a110ac7c x12: 0000000000ff0100 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : 0000000000000003 x7 : 0000000000000000 x6 : ffff80000824419c x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800008184638 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_roll+0x1c4/0x55c fs/xfs/xfs_trans.c:1009 xfs_defer_trans_roll+0x4a8/0xa88 fs/xfs/libxfs/xfs_defer.c:297 xfs_defer_finish_noroll+0x3a4/0x1d58 fs/xfs/libxfs/xfs_defer.c:483 __xfs_trans_commit+0x2a8/0xcd4 fs/xfs/xfs_trans.c:852 xfs_trans_commit+0x24/0x34 fs/xfs/xfs_trans.c:925 xfs_reflink_fill_cow_hole fs/xfs/xfs_reflink.c:427 [inline] xfs_reflink_allocate_cow+0x748/0x834 fs/xfs/xfs_reflink.c:549 xfs_direct_write_iomap_begin+0x43c/0xba4 fs/xfs/xfs_iomap.c:763 xfs_buffered_write_iomap_begin+0x298/0x1914 fs/xfs/xfs_iomap.c:882 iomap_iter+0x5ec/0xf20 fs/iomap/iter.c:74 iomap_file_buffered_write+0x154/0x4f0 fs/iomap/buffered-io.c:814 xfs_file_buffered_write+0x320/0x99c fs/xfs/xfs_file.c:753 xfs_file_write_iter+0x2b0/0x5fc fs/xfs/xfs_file.c:833 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7c8/0xa2c fs/read_write.c:594 ksys_write+0x120/0x210 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:656 __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 97b87e10 91006340 d343fc08 (38736908) ---[ end trace ae65b9df23b2c742 ]--- ---------------- Code disassembly (best guess): 0: 93407d02 sxtw x2, w8 4: 97b87e10 bl 0xfffffffffee1f844 8: 91006340 add x0, x26, #0x18 c: d343fc08 lsr x8, x0, #3 * 10: 38736908 ldrb w8, [x8, x19] <-- trapping instruction