Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 UID: 0 PID: 13273 Comm: syz.2.2420 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 04 c4 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:ffffc9000dfcf8a0 EFLAGS: 00010006 RAX: 0000000000000003 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 1ffff92001bf9f20 RSI: ffffffff8e18595e RDI: ffffffff8c284780 RBP: ffffc9000dfcf9a0 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52001bf9f30 R12: 0000000000000000 R13: ffff8880782a02d0 R14: 0000000000000018 R15: ffffc9000dfcfb20 FS: 00007f5000c5a6c0(0000) GS:ffff888125436000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000005f588000 CR4: 00000000003526f0 Call Trace: rwsem_del_wake_waiter+0x25d/0x2e0 kernel/locking/rwsem.c:612 rwsem_down_write_slowpath+0xa6f/0x1080 kernel/locking/rwsem.c:1234 __down_write_common kernel/locking/rwsem.c:1347 [inline] __down_write_killable kernel/locking/rwsem.c:1361 [inline] down_write_killable+0x1eb/0x240 kernel/locking/rwsem.c:1639 mmap_write_lock_killable include/linux/mmap_lock.h:554 [inline] madvise_lock+0x1ad/0x2e0 mm/madvise.c:1775 do_madvise+0x16d/0x2e0 mm/madvise.c:2016 __do_sys_madvise mm/madvise.c:2029 [inline] __se_sys_madvise mm/madvise.c:2027 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2027 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: 0033:0x7f4fffd9c799 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:00007f5000c5a028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f5000016090 RCX: 00007f4fffd9c799 RDX: 000000000000000e RSI: 0000000000004000 RDI: 0000200000a93000 RBP: 00007f4fffe32c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5000016128 R14: 00007f5000016090 R15: 00007ffc8211e1c8 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 04 c4 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:ffffc9000dfcf8a0 EFLAGS: 00010006 RAX: 0000000000000003 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 1ffff92001bf9f20 RSI: ffffffff8e18595e RDI: ffffffff8c284780 RBP: ffffc9000dfcf9a0 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52001bf9f30 R12: 0000000000000000 R13: ffff8880782a02d0 R14: 0000000000000018 R15: ffffc9000dfcfb20 FS: 00007f5000c5a6c0(0000) GS:ffff888125436000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000005f588000 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 04 c4 8d 00 call 0x8dc410 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