------------[ cut here ]------------ WARNING: fs/buffer.c:1183 at mark_buffer_dirty+0x26c/0x490 fs/buffer.c:1183, CPU#0: syz.2.285/8491 Modules linked in: CPU: 0 UID: 0 PID: 8491 Comm: syz.2.285 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : mark_buffer_dirty+0x26c/0x490 fs/buffer.c:1183 lr : mark_buffer_dirty+0x26c/0x490 fs/buffer.c:1183 sp : ffff80009f1173b0 x29: ffff80009f1173b0 x28: ffff0000dbbac158 x27: dfff800000000000 x26: ffff0000e97dca00 x25: ffff00011e7e8f38 x24: ffff0000f69a19f8 x23: ffff0000dbbac018 x22: ffff0000cbec33a0 x21: 1fffe0001b77582b x20: 0000000000000010 x19: ffff0000f69a19f8 x18: 00000000ffffffff x17: ffff800093599000 x16: ffff8000805387e4 x15: 0000000000000001 x14: 1fffe0001ed3433f x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000080000 x10: 000000000003bd24 x9 : ffff8000a8385000 x8 : 000000000003bd25 x7 : 0000000000000000 x6 : 0000000000000000 x5 : ffff0000e97dcc00 x4 : ffff000121b1b400 x3 : ffff800080eb0438 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: mark_buffer_dirty+0x26c/0x490 fs/buffer.c:1183 (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:2145 block_write_begin+0xa4/0x12c fs/buffer.c:2256 bfs_write_begin+0x48/0xec fs/bfs/file.c:180 generic_perform_write+0x244/0x7bc mm/filemap.c:4314 __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4431 generic_file_write_iter+0x10c/0x47c mm/filemap.c:4457 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x540/0xa3c 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+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 irq event stamp: 10014 hardirqs last enabled at (10013): [] bh_lru_install fs/buffer.c:1353 [inline] hardirqs last enabled at (10013): [] find_get_block_common+0x974/0xdec fs/buffer.c:1410 hardirqs last disabled at (10014): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:412 softirqs last enabled at (9960): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (9960): [] handle_softirqs+0xaf8/0xc88 kernel/softirq.c:650 softirqs last disabled at (9841): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 ---[ 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: 1 UID: 0 PID: 8491 Comm: syz.2.285 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 63400005 (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:380 [inline] lr : sb_getblk include/linux/buffer_head.h:386 [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 : ffff80009f1173f0 x29: ffff80009f117460 x28: ffff0000dbbac158 x27: dfff800000000000 x26: 0000000000000028 x25: ffff00011e7e8f38 x24: 0000000000000000 x23: ffff0000dbbac018 x22: ffff0000cbec7ae0 x21: 1fffe0001b77582b x20: 0000000000000200 x19: 000000000000001d x18: 1fffe00033781890 x17: ffff0001fea8d870 x16: ffff800080544d7c x15: 0000000000000001 x14: 1fffffbff890bd4e x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000080000 x10: 000000000007ffff x9 : 0000000000000000 x8 : 0000000000000005 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000008 x3 : ffff800080eb34e8 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:2145 block_write_begin+0xa4/0x12c fs/buffer.c:2256 bfs_write_begin+0x48/0xec fs/bfs/file.c:180 generic_perform_write+0x244/0x7bc mm/filemap.c:4314 __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4431 generic_file_write_iter+0x10c/0x47c mm/filemap.c:4457 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x540/0xa3c 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+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Code: 97e6365e 9100a31a f94012d4 d343ff48 (387b6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97e6365e bl 0xffffffffff98d978 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