Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 1 UID: 0 PID: 10195 Comm: syz.7.621 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:rwsem_mark_wake+0xfa/0x7c0 kernel/locking/rwsem.c:445 Code: 01 00 74 08 4c 89 f7 e8 94 d9 8d 00 4c 89 74 24 10 4d 8b 26 4d 8d 74 24 18 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 75 06 00 00 41 83 3e 00 74 64 4c 89 ef be RSP: 0018:ffffc900036676a0 EFLAGS: 00010006 RAX: 0000000000000003 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 1ffff920006ccee0 RSI: ffffffff8e1b1f01 RDI: ffffffff8c287200 RBP: ffffc900036677a0 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520006ccef0 R12: 0000000000000000 R13: ffff88801b099bd0 R14: 0000000000000018 R15: ffffc90003667860 FS: 00007fe78ad926c0(0000) GS:ffff888125536000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000000d840 CR3: 000000007bdf2000 CR4: 00000000003526f0 Call Trace: rwsem_del_wake_waiter+0x25d/0x2e0 kernel/locking/rwsem.c:612 rwsem_down_read_slowpath+0x76c/0x940 kernel/locking/rwsem.c:1128 __down_read_common kernel/locking/rwsem.c:1291 [inline] __down_read_killable kernel/locking/rwsem.c:1314 [inline] down_read_killable+0x9e/0x340 kernel/locking/rwsem.c:1595 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:601 get_mmap_lock_carefully mm/mmap_lock.c:450 [inline] lock_mm_and_find_vma+0x2d7/0x340 mm/mmap_lock.c:501 do_user_addr_fault+0x330/0x1340 arch/x86/mm/fault.c:1357 handle_page_fault arch/x86/mm/fault.c:1474 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0010:rep_movs_alternative+0x33/0x90 arch/x86/lib/copy_user_64.S:61 Code: 73 25 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb RSP: 0018:ffffc90003667b88 EFLAGS: 00050246 RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008 RDX: 0000000000000000 RSI: ffffc90003667c20 RDI: 000020000000d840 RBP: ffffc90003667c90 R08: ffffc90003667c27 R09: 1ffff920006ccf84 R10: dffffc0000000000 R11: fffff520006ccf85 R12: 000020000000d848 R13: 00007ffffffff000 R14: ffffc90003667c20 R15: 000020000000d840 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] _inline_copy_to_user include/linux/uaccess.h:206 [inline] _copy_to_user+0x8a/0xb0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:236 [inline] msr_read+0x17a/0x250 arch/x86/kernel/msr.c:69 vfs_read+0x20c/0xa70 fs/read_write.c:572 ksys_read+0x150/0x270 fs/read_write.c:717 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe789f9c799 Code: ff c3 66 2e 0f 1f 84 00 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 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe78ad92028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fe78a215fa0 RCX: 00007fe789f9c799 RDX: 0000000000019000 RSI: 0000200000002000 RDI: 0000000000000003 RBP: 00007fe78a032c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe78a216038 R14: 00007fe78a215fa0 R15: 00007fffa3600178 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:rwsem_mark_wake+0xfa/0x7c0 kernel/locking/rwsem.c:445 Code: 01 00 74 08 4c 89 f7 e8 94 d9 8d 00 4c 89 74 24 10 4d 8b 26 4d 8d 74 24 18 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 75 06 00 00 41 83 3e 00 74 64 4c 89 ef be RSP: 0018:ffffc900036676a0 EFLAGS: 00010006 RAX: 0000000000000003 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 1ffff920006ccee0 RSI: ffffffff8e1b1f01 RDI: ffffffff8c287200 RBP: ffffc900036677a0 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520006ccef0 R12: 0000000000000000 R13: ffff88801b099bd0 R14: 0000000000000018 R15: ffffc90003667860 FS: 00007fe78ad926c0(0000) GS:ffff888125536000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000000d840 CR3: 000000007bdf2000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 01 00 add %eax,(%rax) 2: 74 08 je 0xc 4: 4c 89 f7 mov %r14,%rdi 7: e8 94 d9 8d 00 call 0x8dd9a0 c: 4c 89 74 24 10 mov %r14,0x10(%rsp) 11: 4d 8b 26 mov (%r14),%r12 14: 4d 8d 74 24 18 lea 0x18(%r12),%r14 19: 4c 89 f0 mov %r14,%rax 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 75 06 00 00 jne 0x6ab 36: 41 83 3e 00 cmpl $0x0,(%r14) 3a: 74 64 je 0xa0 3c: 4c 89 ef mov %r13,%rdi 3f: be .byte 0xbe