------------[ cut here ]------------ WARNING: CPU: 0 PID: 6775 at fs/buffer.c:1081 mark_buffer_dirty+0x328/0x5cc fs/buffer.c:1081 Modules linked in: CPU: 0 PID: 6775 Comm: syz.3.731 Not tainted 6.1.144-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 : mark_buffer_dirty+0x328/0x5cc fs/buffer.c:1081 lr : mark_buffer_dirty+0x328/0x5cc fs/buffer.c:1081 sp : ffff800021bd7600 x29: ffff800021bd7600 x28: ffff0000f9042018 x27: 1fffe0001f20842c x26: ffff0000f874ea00 x25: ffff0000e23d8008 x24: ffff0000dfa70cb0 x23: ffff0000f9042160 x22: ffff0000dfa70910 x21: dfff800000000000 x20: 0000000000000010 x19: ffff0000dfa70cb0 x18: ffff800011aabce0 x17: 1fffe00033ed9d7e x16: ffff8000082d2400 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000080000 x11: 000000000001a344 x10: ffff80002385a000 x9 : ffff800008a7c498 x8 : 000000000001a345 x7 : 0000000000000000 x6 : 0000000000000000 x5 : ffff0000f874ec00 x4 : ffff0000d8ad0400 x3 : ffff800008a7c1a0 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: mark_buffer_dirty+0x328/0x5cc fs/buffer.c:1081 bfs_move_block fs/bfs/file.c:43 [inline] bfs_move_blocks fs/bfs/file.c:56 [inline] bfs_get_block+0x478/0x970 fs/bfs/file.c:125 __block_write_begin_int+0x34c/0x13b8 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x98/0x11c fs/buffer.c:2102 bfs_write_begin+0x48/0xec fs/bfs/file.c:177 generic_perform_write+0x230/0x4b0 mm/filemap.c:3846 __generic_file_write_iter+0x168/0x37c mm/filemap.c:3974 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:4006 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ac/0x7c4 fs/read_write.c:584 ksys_pwrite64 fs/read_write.c:699 [inline] __do_sys_pwrite64 fs/read_write.c:709 [inline] __se_sys_pwrite64 fs/read_write.c:706 [inline] __arm64_sys_pwrite64+0x170/0x200 fs/read_write.c:706 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 95584 hardirqs last enabled at (95583): [] bh_lru_install fs/buffer.c:1258 [inline] hardirqs last enabled at (95583): [] __find_get_block+0xbe0/0xdfc fs/buffer.c:1309 hardirqs last disabled at (95584): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (95564): [] softirq_handle_end kernel/softirq.c:439 [inline] softirqs last enabled at (95564): [] handle_softirqs+0xaf8/0xc6c kernel/softirq.c:624 softirqs last disabled at (95403): [] __do_softirq+0x14/0x20 kernel/softirq.c:630 ---[ 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 = 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 [dfff800000000005] address between user and kernel address ranges Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 6775 Comm: syz.3.731 Tainted: G W 6.1.144-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 : bfs_move_block fs/bfs/file.c:42 [inline] pc : bfs_move_blocks fs/bfs/file.c:56 [inline] pc : bfs_get_block+0x438/0x970 fs/bfs/file.c:125 lr : sb_getblk include/linux/buffer_head.h:356 [inline] lr : bfs_move_block fs/bfs/file.c:41 [inline] lr : bfs_move_blocks fs/bfs/file.c:56 [inline] lr : bfs_get_block+0x410/0x970 fs/bfs/file.c:125 sp : ffff800021bd7650 x29: ffff800021bd76c0 x28: ffff0000f9042018 x27: 1fffe0001f20842c x26: 0000000000000028 x25: ffff0000e23d8008 x24: 0000000000000000 x23: ffff0000f9042160 x22: ffff0000f5d20e80 x21: dfff800000000000 x20: 0000000000000200 x19: 000000000000001d x18: ffff800011aabce0 x17: ffff8000181e6000 x16: ffff8000082e7c3c x15: 0000000000000002 x14: 00000000ffff8000 x13: 1ffff00002a160b1 x12: 0000000000080000 x11: 000000000006ff11 x10: ffff80002385a000 x9 : 0000000000000000 x8 : 0000000000000005 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000008 x3 : ffff800008a7e134 x2 : 0000000000000001 x1 : 0000000000000003 x0 : 0000000000000000 Call trace: bfs_move_block fs/bfs/file.c:42 [inline] bfs_move_blocks fs/bfs/file.c:56 [inline] bfs_get_block+0x438/0x970 fs/bfs/file.c:125 __block_write_begin_int+0x34c/0x13b8 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x98/0x11c fs/buffer.c:2102 bfs_write_begin+0x48/0xec fs/bfs/file.c:177 generic_perform_write+0x230/0x4b0 mm/filemap.c:3846 __generic_file_write_iter+0x168/0x37c mm/filemap.c:3974 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:4006 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ac/0x7c4 fs/read_write.c:584 ksys_pwrite64 fs/read_write.c:699 [inline] __do_sys_pwrite64 fs/read_write.c:709 [inline] __se_sys_pwrite64 fs/read_write.c:706 [inline] __arm64_sys_pwrite64+0x170/0x200 fs/read_write.c:706 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Code: 97e658a8 9100a31a f94012d4 d343ff48 (38756908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97e658a8 bl 0xffffffffff9962a0 4: 9100a31a add x26, x24, #0x28 8: f94012d4 ldr x20, [x22, #32] c: d343ff48 lsr x8, x26, #3 * 10: 38756908 ldrb w8, [x8, x21] <-- trapping instruction