BUG: unable to handle page fault for address: fffffbfff3598930 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 23ffe4067 P4D 23ffe4067 PUD 23ffe3067 PMD 13fff1067 PTE 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 13075 Comm: syz.7.1662 Not tainted 6.14.0-rc5-syzkaller-00023-gbb2281fb05e5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x82/0x290 mm/kasan/generic.c:189 Code: 01 00 00 00 00 fc ff df 4f 8d 3c 31 4c 89 fd 4c 29 dd 48 83 fd 10 7f 29 48 85 ed 0f 84 3e 01 00 00 4c 89 cd 48 f7 d5 48 01 dd <41> 80 3b 00 0f 85 c9 01 00 00 49 ff c3 48 ff c5 75 ee e9 1e 01 00 RSP: 0018:ffffc900034071c0 EFLAGS: 00010086 RAX: 0000000000cef601 RBX: 1ffffffff3598930 RCX: ffffffff819cd4e4 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff9acc4980 RBP: ffffffffffffffff R08: ffffffff9acc4987 R09: 1ffffffff3598930 R10: dffffc0000000000 R11: fffffbfff3598930 R12: ffff888030f2e4d4 R13: ffff888030f2da00 R14: dffffc0000000001 R15: fffffbfff3598931 FS: 00007fc9b07f66c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffbfff3598930 CR3: 00000000672d2000 CR4: 0000000000350ef0 Call Trace: instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] __lock_acquire+0xc94/0x2100 kernel/locking/lockdep.c:5198 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:606 raw_spin_rq_lock kernel/sched/sched.h:1521 [inline] rq_lock kernel/sched/sched.h:1852 [inline] __schedule+0x357/0x4c90 kernel/sched/core.c:6688 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7087 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707 RIP: 0010:lock_downgrade+0x5b3/0x900 kernel/locking/lockdep.c:5757 Code: 3c 2b 00 74 08 4c 89 f7 e8 7a 4c 8c 00 f6 84 24 91 00 00 00 02 75 6f 41 f7 c4 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 4b c7 44 3d 08 00 00 00 00 65 48 8b 04 RSP: 0018:ffffc90003407820 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff92000680f16 RCX: ffffc90003407803 RDX: 0000000000000000 RSI: ffffffff8c2ac500 RDI: ffffffff8c80fe60 RBP: ffffc90003407950 R08: ffffffff94549877 R09: 1ffffffff28a930e R10: dffffc0000000000 R11: fffffbfff28a930f R12: 0000000000000246 R13: dffffc0000000000 R14: ffffc900034078b0 R15: 1ffff92000680f10 downgrade_write+0x7b/0x3e0 kernel/locking/rwsem.c:1639 mmap_write_downgrade include/linux/mmap_lock.h:184 [inline] vms_complete_munmap_vmas+0x196/0x8f0 mm/vma.c:1181 do_vmi_align_munmap+0x5ef/0x6f0 mm/vma.c:1445 do_vmi_munmap+0x24e/0x2d0 mm/vma.c:1493 __vm_munmap+0x372/0x510 mm/vma.c:2951 __do_sys_munmap mm/mmap.c:1084 [inline] __se_sys_munmap mm/mmap.c:1081 [inline] __x64_sys_munmap+0x60/0x70 mm/mmap.c:1081 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc9b298d1f7 Code: 00 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc9b07f5e18 EFLAGS: 00000246 ORIG_RAX: 000000000000000b RAX: ffffffffffffffda RBX: 0000000000200000 RCX: 00007fc9b298d1f7 RDX: 0000000000000000 RSI: 0000000008400000 RDI: 00007fc9a8200000 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000001f7a4 R10: 0000000000003ffc R11: 0000000000000246 R12: 0000000000000008 R13: 00007fc9b07f5ef0 R14: 00007fc9b07f5eb0 R15: 00007fc9a8200000 Modules linked in: CR2: fffffbfff3598930 ---[ end trace 0000000000000000 ]--- RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x82/0x290 mm/kasan/generic.c:189 Code: 01 00 00 00 00 fc ff df 4f 8d 3c 31 4c 89 fd 4c 29 dd 48 83 fd 10 7f 29 48 85 ed 0f 84 3e 01 00 00 4c 89 cd 48 f7 d5 48 01 dd <41> 80 3b 00 0f 85 c9 01 00 00 49 ff c3 48 ff c5 75 ee e9 1e 01 00 RSP: 0018:ffffc900034071c0 EFLAGS: 00010086 RAX: 0000000000cef601 RBX: 1ffffffff3598930 RCX: ffffffff819cd4e4 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff9acc4980 RBP: ffffffffffffffff R08: ffffffff9acc4987 R09: 1ffffffff3598930 R10: dffffc0000000000 R11: fffffbfff3598930 R12: ffff888030f2e4d4 R13: ffff888030f2da00 R14: dffffc0000000001 R15: fffffbfff3598931 FS: 00007fc9b07f66c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffbfff3598930 CR3: 00000000672d2000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess), 7 bytes skipped: 0: df 4f 8d fisttps -0x73(%rdi) 3: 3c 31 cmp $0x31,%al 5: 4c 89 fd mov %r15,%rbp 8: 4c 29 dd sub %r11,%rbp b: 48 83 fd 10 cmp $0x10,%rbp f: 7f 29 jg 0x3a 11: 48 85 ed test %rbp,%rbp 14: 0f 84 3e 01 00 00 je 0x158 1a: 4c 89 cd mov %r9,%rbp 1d: 48 f7 d5 not %rbp 20: 48 01 dd add %rbx,%rbp * 23: 41 80 3b 00 cmpb $0x0,(%r11) <-- trapping instruction 27: 0f 85 c9 01 00 00 jne 0x1f6 2d: 49 ff c3 inc %r11 30: 48 ff c5 inc %rbp 33: 75 ee jne 0x23 35: e9 .byte 0xe9 36: 1e (bad) 37: 01 00 add %eax,(%rax)