------------[ cut here ]------------ WARNING: CPU: 0 PID: 10152 at fs/buffer.c:1189 mark_buffer_dirty+0x284/0x490 fs/buffer.c:1189 Modules linked in: CPU: 0 UID: 0 PID: 10152 Comm: syz.1.1128 Not tainted 6.16.0-rc7-syzkaller-g82af5ea7c611 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2025 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : mark_buffer_dirty+0x284/0x490 fs/buffer.c:1189 lr : mark_buffer_dirty+0x284/0x490 fs/buffer.c:1189 sp : ffff80009f4f7390 x29: ffff80009f4f7390 x28: ffff0000fc6fc160 x27: dfff800000000000 x26: ffff0000e7a2b600 x25: ffff0000f74e99a8 x24: ffff0000ded55488 x23: ffff0000fc6fc018 x22: ffff0000c15ae488 x21: 1fffe0001f8df82c x20: 0000000000000010 x19: ffff0000ded55488 x18: 00000000ffffffff x17: ffff800093376000 x16: ffff80008051f01c x15: 0000000000000001 x14: 1fffe0001bdaaa91 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000080000 x10: 000000000000ba4f x9 : ffff8000a8c2a000 x8 : 000000000000ba50 x7 : 0000000000000000 x6 : 0000000000000000 x5 : ffff0000e7a2b800 x4 : ffff0000e1b75400 x3 : ffff800080e3349c x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: mark_buffer_dirty+0x284/0x490 fs/buffer.c:1189 (P) bfs_move_block fs/bfs/file.c:44 [inline] bfs_move_blocks fs/bfs/file.c:57 [inline] bfs_get_block+0x4d8/0x9d4 fs/bfs/file.c:126 __block_write_begin_int+0x53c/0x15e8 fs/buffer.c:2151 block_write_begin+0xa0/0x128 fs/buffer.c:2262 bfs_write_begin+0x48/0xec fs/bfs/file.c:179 generic_perform_write+0x23c/0x79c mm/filemap.c:4112 __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4229 generic_file_write_iter+0x104/0x470 mm/filemap.c:4255 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x62c/0x97c fs/read_write.c:686 ksys_write+0x120/0x210 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:746 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 irq event stamp: 4642 hardirqs last enabled at (4641): [] bh_lru_install fs/buffer.c:1359 [inline] hardirqs last enabled at (4641): [] find_get_block_common+0x970/0xde8 fs/buffer.c:1416 hardirqs last disabled at (4642): [] el1_brk64+0x1c/0x48 arch/arm64/kernel/entry-common.c:574 softirqs last enabled at (4582): [] softirq_handle_end kernel/softirq.c:425 [inline] softirqs last enabled at (4582): [] handle_softirqs+0xaf8/0xc88 kernel/softirq.c:607 softirqs last disabled at (3183): [] __do_softirq+0x14/0x20 kernel/softirq.c:613 ---[ end trace 0000000000000000 ]--- Unable to handle kernel paging request at virtual address dfff800000000005 KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] 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, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000005] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 10152 Comm: syz.1.1128 Tainted: G W 6.16.0-rc7-syzkaller-g82af5ea7c611 #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2025 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : bfs_move_block fs/bfs/file.c:43 [inline] pc : bfs_move_blocks fs/bfs/file.c:57 [inline] pc : bfs_get_block+0x498/0x9d4 fs/bfs/file.c:126 lr : __getblk include/linux/buffer_head.h:382 [inline] lr : sb_getblk include/linux/buffer_head.h:388 [inline] lr : bfs_move_block fs/bfs/file.c:42 [inline] lr : bfs_move_blocks fs/bfs/file.c:57 [inline] lr : bfs_get_block+0x470/0x9d4 fs/bfs/file.c:126 sp : ffff80009f4f73d0 x29: ffff80009f4f7440 x28: ffff0000fc6fc160 x27: dfff800000000000 x26: 0000000000000028 x25: ffff0000f74e99a8 x24: 0000000000000000 x23: ffff0000fc6fc018 x22: ffff0000c15d1828 x21: 1fffe0001f8df82c x20: 0000000000000200 x19: 000000000000001f x18: 00000000ffffffff x17: ffff0001fea8b870 x16: ffff80008052b68c x15: 0000000000000001 x14: 1fffffbff873d056 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000080000 x10: 00000000000755e7 x9 : 0000000000000000 x8 : 0000000000000005 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000008 x3 : ffff800080e36534 x2 : 0000000000000001 x1 : 0000000000000040 x0 : 0000000000000000 Call trace: bfs_move_block fs/bfs/file.c:43 [inline] (P) bfs_move_blocks fs/bfs/file.c:57 [inline] (P) bfs_get_block+0x498/0x9d4 fs/bfs/file.c:126 (P) __block_write_begin_int+0x53c/0x15e8 fs/buffer.c:2151 block_write_begin+0xa0/0x128 fs/buffer.c:2262 bfs_write_begin+0x48/0xec fs/bfs/file.c:179 generic_perform_write+0x23c/0x79c mm/filemap.c:4112 __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4229 generic_file_write_iter+0x104/0x470 mm/filemap.c:4255 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x62c/0x97c fs/read_write.c:686 ksys_write+0x120/0x210 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:746 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Code: 97e6eaba 9100a31a f94012d4 d343ff48 (387b6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97e6eaba bl 0xffffffffff9baae8 4: 9100a31a add x26, x24, #0x28 8: f94012d4 ldr x20, [x22, #32] c: d343ff48 lsr x8, x26, #3 * 10: 387b6908 ldrb w8, [x8, x27] <-- trapping instruction