Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 0 UID: 0 PID: 7992 Comm: syz.1.908 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:task_cpu include/linux/sched.h:2268 [inline] RIP: 0010:is_task_rq_idle kernel/sched/core.c:6169 [inline] RIP: 0010:cookie_equals kernel/sched/core.c:6174 [inline] RIP: 0010:pick_next_task kernel/sched/core.c:6355 [inline] RIP: 0010:__schedule+0x4030/0x5550 kernel/sched/core.c:7143 Code: 24 80 00 00 00 e8 80 97 f2 f6 48 8b 84 24 80 00 00 00 48 8b 18 4c 8d 7b 14 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 87 04 00 00 45 8b 3f 49 83 ff 08 0f 83 98 RSP: 0018:ffffc9000c527020 EFLAGS: 00010003 RAX: 0000000000000002 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffff8880b8620c60 RBP: ffffc9000c527218 R08: ffffffff8fcf38f7 R09: 1ffffffff1f9e71e R10: dffffc0000000000 R11: ffffffff8199feb0 R12: ffff8880b863c658 R13: ffff888125a6b000 R14: 1ffff110170c7922 R15: 0000000000000014 FS: 0000555593ec3500(0000) GS:ffff888125a6b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffbdf6acfe0 CR3: 000000002b9f6000 CR4: 00000000003526f0 Call Trace: preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7552 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x14f/0x8c0 kernel/entry/common.c:167 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:681 RIP: 0010:lock_release+0x2d7/0x3c0 kernel/locking/lockdep.c:5895 Code: 2c 1a 11 00 00 00 00 eb b5 e8 f5 8b 9c 09 f7 c3 00 02 00 00 74 b9 65 48 8b 05 a5 e6 19 11 48 3b 44 24 28 75 44 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 ca 53 a0 09 cc 48 8d 3d a2 34 31 RSP: 0018:ffffc9000c527348 EFLAGS: 00000286 RAX: a341a4117ed4f200 RBX: 0000000000000202 RCX: 0000000000000046 RDX: 0000000000000004 RSI: ffffffff8dbdec30 RDI: ffffffff8bcc4d80 RBP: ffff888030308ca8 R08: ffffffff8234db2e R09: ffffffff8e3cb2a0 R10: dffffc0000000000 R11: fffff940002a18b7 R12: 0000000000000004 R13: 0000000000000004 R14: ffffffff8e3cb2a0 R15: ffff888030308000 rcu_lock_release include/linux/rcupdate.h:310 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] lruvec_stat_mod_folio+0x2f0/0x3e0 mm/memcontrol.c:987 __folio_mod_stat mm/rmap.c:1336 [inline] __folio_add_rmap mm/rmap.c:1428 [inline] __folio_add_file_rmap mm/rmap.c:1706 [inline] folio_add_file_rmap_ptes+0x43a/0x6c0 mm/rmap.c:1732 insert_page_into_pte_locked+0x694/0x820 mm/memory.c:2386 insert_page+0x24e/0x3b0 mm/memory.c:2406 kcov_mmap+0xcb/0x140 kernel/kcov.c:525 vfs_mmap include/linux/fs.h:2066 [inline] mmap_file mm/internal.h:167 [inline] __mmap_new_file_vma mm/vma.c:2496 [inline] __mmap_new_vma mm/vma.c:2562 [inline] __mmap_region mm/vma.c:2774 [inline] mmap_region+0x199c/0x2220 mm/vma.c:2860 do_mmap+0xc2f/0x10c0 mm/mmap.c:560 vm_mmap_pgoff+0x2cc/0x4f0 mm/util.c:581 ksys_mmap_pgoff+0x4e8/0x720 mm/mmap.c:606 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd1d348cbc2 Code: 4f 01 00 0f 1f 44 00 00 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 3b 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 6e 5b 5d c3 0f 1f 00 48 c7 c0 e8 ff ff ff 64 RSP: 002b:00007ffef1748778 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fd1d127b000 RCX: 00007fd1d348cbc2 RDX: 0000000000000003 RSI: 0000000000400000 RDI: 00007fd1d127b000 RBP: 0000000000000011 R08: 00000000000000db R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000206 R12: 0000000000000003 R13: 0000000000000004 R14: 0000000000000000 R15: 00007fd1d3705fa0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:task_cpu include/linux/sched.h:2268 [inline] RIP: 0010:is_task_rq_idle kernel/sched/core.c:6169 [inline] RIP: 0010:cookie_equals kernel/sched/core.c:6174 [inline] RIP: 0010:pick_next_task kernel/sched/core.c:6355 [inline] RIP: 0010:__schedule+0x4030/0x5550 kernel/sched/core.c:7143 Code: 24 80 00 00 00 e8 80 97 f2 f6 48 8b 84 24 80 00 00 00 48 8b 18 4c 8d 7b 14 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 87 04 00 00 45 8b 3f 49 83 ff 08 0f 83 98 RSP: 0018:ffffc9000c527020 EFLAGS: 00010003 RAX: 0000000000000002 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffff8880b8620c60 RBP: ffffc9000c527218 R08: ffffffff8fcf38f7 R09: 1ffffffff1f9e71e R10: dffffc0000000000 R11: ffffffff8199feb0 R12: ffff8880b863c658 R13: ffff888125a6b000 R14: 1ffff110170c7922 R15: 0000000000000014 FS: 0000555593ec3500(0000) GS:ffff888125a6b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffbdf6acfe0 CR3: 000000002b9f6000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 24 80 and $0x80,%al 2: 00 00 add %al,(%rax) 4: 00 e8 add %ch,%al 6: 80 97 f2 f6 48 8b 84 adcb $0x84,-0x74b7090e(%rdi) d: 24 80 and $0x80,%al f: 00 00 add %al,(%rax) 11: 00 48 8b add %cl,-0x75(%rax) 14: 18 4c 8d 7b sbb %cl,0x7b(%rbp,%rcx,4) 18: 14 4c adc $0x4c,%al 1a: 89 f8 mov %edi,%eax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 87 04 00 00 jne 0x4bd 36: 45 8b 3f mov (%r15),%r15d 39: 49 83 ff 08 cmp $0x8,%r15 3d: 0f .byte 0xf 3e: 83 .byte 0x83 3f: 98 cwtl