general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 PID: 2697 Comm: loop9 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:NODE_MAPPING fs/f2fs/f2fs.h:2055 [inline] RIP: 0010:f2fs_in_warm_node_list+0x4b/0x1b0 fs/f2fs/node.c:314 Code: 81 c6 b8 00 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 93 49 95 ff 4d 8b 36 49 83 c6 30 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 76 49 95 ff 4d 8b 26 4c 8d 73 18 RSP: 0018:ffffc90000007c50 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffffea00048e1700 RCX: ffff888120acbb40 RDX: 0000000080000100 RSI: ffffea00048e1700 RDI: ffff888112aa0000 RBP: ffffc90000007c70 R08: ffffffff86c36c2f R09: 1ffffffff0d86d85 R10: dffffc0000000000 R11: fffffbfff0d86d86 R12: dffffc0000000000 R13: ffff888112aa0000 R14: 0000000000000030 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2921a1 CR3: 000000010faf1000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: f2fs_write_end_io+0x69a/0xe00 fs/f2fs/data.c:373 bio_endio+0x637/0x850 block/bio.c:1458 req_bio_endio block/blk-core.c:263 [inline] blk_update_request+0x722/0x1020 block/blk-core.c:1468 blk_mq_end_request+0x41/0x80 block/blk-mq.c:572 lo_complete_rq+0x131/0x2b0 drivers/block/loop.c:490 blk_done_softirq+0x26f/0x2f0 block/blk-mq.c:596 __do_softirq+0x255/0x563 kernel/softirq.c:309 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:405 [inline] __irq_exit_rcu+0x128/0x150 kernel/softirq.c:435 irq_exit_rcu+0x9/0x10 kernel/softirq.c:447 common_interrupt+0x100/0x180 arch/x86/kernel/irq.c:241 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:626 RIP: 0010:sched_submit_work kernel/sched/core.c:4856 [inline] RIP: 0010:schedule+0xa5/0x1d0 kernel/sched/core.c:4881 Code: 01 00 00 00 e8 2c 3c c4 fc 4c 8d b3 98 08 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 ef 84 1e fd 49 83 3e 00 <75> 72 4c 8d b3 b8 08 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 RSP: 0018:ffffc9000101fdf0 EFLAGS: 00000246 RAX: 1ffff1102415987b RBX: ffff888120acbb40 RCX: ffff888120acbb40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000101fe10 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff0dd4ae4 R12: dffffc0000000000 R13: ffff888120acc1a0 R14: ffff888120acc3d8 R15: dffffc0000000000 kthread_worker_fn+0x444/0x7d0 kernel/kthread.c:766 loop_kthread_worker_fn+0x41/0x60 drivers/block/loop.c:927 kthread+0x324/0x3b0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Modules linked in: ---[ end trace fa5324a63fa8358c ]--- RIP: 0010:NODE_MAPPING fs/f2fs/f2fs.h:2055 [inline] RIP: 0010:f2fs_in_warm_node_list+0x4b/0x1b0 fs/f2fs/node.c:314 Code: 81 c6 b8 00 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 93 49 95 ff 4d 8b 36 49 83 c6 30 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 76 49 95 ff 4d 8b 26 4c 8d 73 18 RSP: 0018:ffffc90000007c50 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffffea00048e1700 RCX: ffff888120acbb40 RDX: 0000000080000100 RSI: ffffea00048e1700 RDI: ffff888112aa0000 RBP: ffffc90000007c70 R08: ffffffff86c36c2f R09: 1ffffffff0d86d85 R10: dffffc0000000000 R11: fffffbfff0d86d86 R12: dffffc0000000000 R13: ffff888112aa0000 R14: 0000000000000030 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2921a1 CR3: 000000000640f000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 81 c6 b8 00 00 00 add $0xb8,%esi 6: 4c 89 f0 mov %r14,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 12: 74 08 je 0x1c 14: 4c 89 f7 mov %r14,%rdi 17: e8 93 49 95 ff call 0xff9549af 1c: 4d 8b 36 mov (%r14),%r14 1f: 49 83 c6 30 add $0x30,%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 76 49 95 ff call 0xff9549af 39: 4d 8b 26 mov (%r14),%r12 3c: 4c 8d 73 18 lea 0x18(%rbx),%r14