Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 1 UID: 0 PID: 13027 Comm: syz.0.1751 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:bfs_move_block fs/bfs/file.c:43 [inline] RIP: 0010:bfs_move_blocks fs/bfs/file.c:57 [inline] RIP: 0010:bfs_get_block+0x3ab/0xe20 fs/bfs/file.c:126 Code: aa ff 48 8d 7d 20 48 89 c3 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 ff 07 00 00 48 8d 7b 28 48 8b 55 20 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 d1 07 00 00 48 8d 7d 28 48 8b 43 28 48 89 f9 RSP: 0018:ffffc90004046bb8 EFLAGS: 00010216 RAX: 0000000000000005 RBX: 0000000000000000 RCX: ffffffff829e490d RDX: 0000000000000200 RSI: ffffffff829e4512 RDI: 0000000000000028 RBP: ffff8880545e5ae0 R08: 0000000000000006 R09: 0000000000000043 R10: 0000000000000040 R11: 0000000000000000 R12: 0000000000000011 R13: dffffc0000000000 R14: ffff888051850000 R15: ffffed100a30a02a FS: 00007f0e0dd966c0(0000) GS:ffff888124476000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbc87c49a10 CR3: 000000003f146000 CR4: 0000000000350ef0 Call Trace: __block_write_begin_int+0x57a/0x19c0 fs/buffer.c:2042 block_write_begin+0x9d/0x1d0 fs/buffer.c:2153 bfs_write_begin+0x31/0xd0 fs/bfs/file.c:180 generic_perform_write+0x292/0xa40 mm/filemap.c:4325 __generic_file_write_iter+0x1f7/0x240 mm/filemap.c:4442 generic_file_write_iter+0xe1/0x3d0 mm/filemap.c:4468 __kernel_write_iter+0x2ac/0x920 fs/read_write.c:621 __kernel_write+0xf6/0x140 fs/read_write.c:641 __dump_emit fs/coredump.c:1226 [inline] dump_emit+0x21f/0x330 fs/coredump.c:1264 elf_core_dump+0x2772/0x3d10 fs/binfmt_elf.c:2088 coredump_write fs/coredump.c:1053 [inline] do_coredump fs/coredump.c:1132 [inline] vfs_coredump+0x29a0/0x5770 fs/coredump.c:1206 get_signal+0x1f2a/0x21e0 kernel/signal.c:3022 arch_do_signal_or_restart+0x91/0x7a0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop kernel/entry/common.c:98 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:252 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:323 [inline] irqentry_exit+0x403/0x790 kernel/entry/common.c:162 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7f0e0cf9cde1 Code: 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 48 3d 01 f0 ff ff 73 01 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:00000000fffffeb0 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f0e0d216090 RCX: 00007f0e0cf9cdd9 RDX: 0000000000000000 RSI: 00000000fffffeb0 RDI: 0000000002000400 RBP: 00007f0e0d032d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007f0e0d216128 R14: 00007f0e0d216090 R15: 00007ffd406fb8c8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bfs_move_block fs/bfs/file.c:43 [inline] RIP: 0010:bfs_move_blocks fs/bfs/file.c:57 [inline] RIP: 0010:bfs_get_block+0x3ab/0xe20 fs/bfs/file.c:126 Code: aa ff 48 8d 7d 20 48 89 c3 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 ff 07 00 00 48 8d 7b 28 48 8b 55 20 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 d1 07 00 00 48 8d 7d 28 48 8b 43 28 48 89 f9 RSP: 0018:ffffc90004046bb8 EFLAGS: 00010216 RAX: 0000000000000005 RBX: 0000000000000000 RCX: ffffffff829e490d RDX: 0000000000000200 RSI: ffffffff829e4512 RDI: 0000000000000028 RBP: ffff8880545e5ae0 R08: 0000000000000006 R09: 0000000000000043 R10: 0000000000000040 R11: 0000000000000000 R12: 0000000000000011 R13: dffffc0000000000 R14: ffff888051850000 R15: ffffed100a30a02a FS: 00007f0e0dd966c0(0000) GS:ffff888124376000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff572614e9c CR3: 000000003f146000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: aa stos %al,%es:(%rdi) 1: ff 48 8d decl -0x73(%rax) 4: 7d 20 jge 0x26 6: 48 89 c3 mov %rax,%rbx 9: 48 89 f8 mov %rdi,%rax c: 48 c1 e8 03 shr $0x3,%rax 10: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 15: 0f 85 ff 07 00 00 jne 0x81a 1b: 48 8d 7b 28 lea 0x28(%rbx),%rdi 1f: 48 8b 55 20 mov 0x20(%rbp),%rdx 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 0f 85 d1 07 00 00 jne 0x806 35: 48 8d 7d 28 lea 0x28(%rbp),%rdi 39: 48 8b 43 28 mov 0x28(%rbx),%rax 3d: 48 89 f9 mov %rdi,%rcx