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 88 at addr 0000000000000000 by task syz.6.529/7284 CPU: 1 PID: 7284 Comm: syz.6.529 Not tainted 5.15.184-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_fs_dirty_inode+0x174/0x1bc fs/xfs/xfs_super.c:667 __mark_inode_dirty+0x2b0/0x1070 fs/fs-writeback.c:2464 mark_inode_dirty_sync include/linux/fs.h:2472 [inline] iput+0x1bc/0x77c fs/inode.c:1792 dentry_unlink_inode+0x360/0x438 fs/dcache.c:380 __dentry_kill+0x320/0x598 fs/dcache.c:586 shrink_dentry_list+0x410/0x7c8 fs/dcache.c:1181 prune_dcache_sb+0x100/0x160 fs/dcache.c:1262 super_cache_scan+0x26c/0x39c fs/super.c:105 do_shrink_slab+0x4c0/0xfb8 mm/vmscan.c:765 shrink_slab_memcg mm/vmscan.c:834 [inline] shrink_slab+0x414/0x6fc mm/vmscan.c:913 drop_slab_node+0xcc/0x170 mm/vmscan.c:960 drop_slab+0x84/0xf8 mm/vmscan.c:970 drop_caches_sysctl_handler+0x16c/0x2fc fs/drop_caches.c:66 proc_sys_call_handler+0x3fc/0x69c fs/proc/proc_sysctl.c:588 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:614 do_iter_readv_writev+0x3a0/0x4f8 fs/read_write.c:-1 do_iter_write+0x1c4/0x670 fs/read_write.c:855 vfs_writev fs/read_write.c:928 [inline] do_writev+0x1e0/0x380 fs/read_write.c:971 __do_sys_writev fs/read_write.c:1044 [inline] __se_sys_writev fs/read_write.c:1041 [inline] __arm64_sys_writev+0x80/0x94 fs/read_write.c:1041 __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: 7284 Comm: syz.6.529 Tainted: G B 5.15.184-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 : ffff80001f546ea0 x29: ffff80001f546fa0 x28: 0000000000000150 x27: 0000000000000002 x26: 0000000000000000 x25: ffff0000dcbf4300 x24: ffff0000dcbf4290 x23: ffff80001f546f40 x22: 1fffe0001b97e860 x21: 0000000000000002 x20: ffff0000dcbf4280 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_fs_dirty_inode+0x174/0x1bc fs/xfs/xfs_super.c:667 __mark_inode_dirty+0x2b0/0x1070 fs/fs-writeback.c:2464 mark_inode_dirty_sync include/linux/fs.h:2472 [inline] iput+0x1bc/0x77c fs/inode.c:1792 dentry_unlink_inode+0x360/0x438 fs/dcache.c:380 __dentry_kill+0x320/0x598 fs/dcache.c:586 shrink_dentry_list+0x410/0x7c8 fs/dcache.c:1181 prune_dcache_sb+0x100/0x160 fs/dcache.c:1262 super_cache_scan+0x26c/0x39c fs/super.c:105 do_shrink_slab+0x4c0/0xfb8 mm/vmscan.c:765 shrink_slab_memcg mm/vmscan.c:834 [inline] shrink_slab+0x414/0x6fc mm/vmscan.c:913 drop_slab_node+0xcc/0x170 mm/vmscan.c:960 drop_slab+0x84/0xf8 mm/vmscan.c:970 drop_caches_sysctl_handler+0x16c/0x2fc fs/drop_caches.c:66 proc_sys_call_handler+0x3fc/0x69c fs/proc/proc_sysctl.c:588 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:614 do_iter_readv_writev+0x3a0/0x4f8 fs/read_write.c:-1 do_iter_write+0x1c4/0x670 fs/read_write.c:855 vfs_writev fs/read_write.c:928 [inline] do_writev+0x1e0/0x380 fs/read_write.c:971 __do_sys_writev fs/read_write.c:1044 [inline] __se_sys_writev fs/read_write.c:1041 [inline] __arm64_sys_writev+0x80/0x94 fs/read_write.c:1041 __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 97b87da3 91006340 d343fc08 (38736908) ---[ end trace d13cfc2cd1c769ca ]--- ---------------- Code disassembly (best guess): 0: 93407d02 sxtw x2, w8 4: 97b87da3 bl 0xfffffffffee1f690 8: 91006340 add x0, x26, #0x18 c: d343fc08 lsr x8, x0, #3 * 10: 38736908 ldrb w8, [x8, x19] <-- trapping instruction