Hello, syzbot found the following issue on: HEAD commit: e5d3fd687aac Add linux-next specific files for 20250218 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1643b498580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4e945b2fe8e5992f dashboard link: https://syzkaller.appspot.com/bug?extid=556fda2d78f9b0daa141 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=138207a4580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ef079ccd2725/disk-e5d3fd68.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/99f2123d6831/vmlinux-e5d3fd68.xz kernel image: https://storage.googleapis.com/syzbot-assets/eadfc9520358/bzImage-e5d3fd68.xz The issue was bisected to: commit 0670f2f4d6ff1cd6aa351389130ba7bbafb02320 Author: Suren Baghdasaryan <surenb@xxxxxxxxxx> Date: Thu Feb 13 22:46:49 2025 +0000 mm: replace vm_lock and detached flag with a reference count bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1355bfdf980000 final oops: https://syzkaller.appspot.com/x/report.txt?x=10d5bfdf980000 console output: https://syzkaller.appspot.com/x/log.txt?x=1755bfdf980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+556fda2d78f9b0daa141@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 0670f2f4d6ff ("mm: replace vm_lock and detached flag with a reference count") Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 27018 Comm: syz.1.4414 Not tainted 6.14.0-rc3-next-20250218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:vma_refcount_put include/linux/mm.h:712 [inline] RIP: 0010:vma_end_read include/linux/mm.h:811 [inline] RIP: 0010:lock_vma_under_rcu+0x578/0xac0 mm/memory.c:6454 Code: be 5d b1 ff 49 be 00 00 00 00 00 fc ff df 4d 85 ff 74 0d 49 81 ff 01 f0 ff ff 0f 82 a3 02 00 00 49 83 ff f5 0f 85 55 03 00 00 <41> 80 3e 00 74 0a bf 05 00 00 00 e8 28 df 18 00 4c 8b 34 25 05 00 RSP: 0000:ffffc9000b837d80 EFLAGS: 00010246 RAX: fffffffffffffff5 RBX: 0000000000000000 RCX: ffff888079eb8000 RDX: ffff888079eb8000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000b837ed8 R08: ffffffff8210a26a R09: 1ffff110068be328 R10: dffffc0000000000 R11: ffffed10068be329 R12: ffffc9000b837e10 R13: ffff88802890aa20 R14: dffffc0000000000 R15: fffffffffffffff5 FS: 00005555908b1500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000400000002fc0 CR3: 0000000011df6000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> do_user_addr_fault arch/x86/mm/fault.c:1328 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x17b/0x920 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f617a954ed8 Code: fc 89 37 c3 c5 fa 6f 06 c5 fa 6f 4c 16 f0 c5 fa 7f 07 c5 fa 7f 4c 17 f0 c3 66 0f 1f 84 00 00 00 00 00 48 8b 4c 16 f8 48 8b 36 <48> 89 37 48 89 4c 17 f8 c3 c5 fe 6f 54 16 e0 c5 fe 6f 5c 16 c0 c5 RSP: 002b:00007ffc20f24718 EFLAGS: 00010246 RAX: 0000400000002fc0 RBX: 0000000000000004 RCX: 0031313230386c6e RDX: 0000000000000008 RSI: 0031313230386c6e RDI: 0000400000002fc0 RBP: 0000000000000000 R08: 00007f617a800000 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000009 R12: 00007f617aba5fac R13: 00007f617aba5fa0 R14: fffffffffffffffe R15: 0000000000000006 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:vma_refcount_put include/linux/mm.h:712 [inline] RIP: 0010:vma_end_read include/linux/mm.h:811 [inline] RIP: 0010:lock_vma_under_rcu+0x578/0xac0 mm/memory.c:6454 Code: be 5d b1 ff 49 be 00 00 00 00 00 fc ff df 4d 85 ff 74 0d 49 81 ff 01 f0 ff ff 0f 82 a3 02 00 00 49 83 ff f5 0f 85 55 03 00 00 <41> 80 3e 00 74 0a bf 05 00 00 00 e8 28 df 18 00 4c 8b 34 25 05 00 RSP: 0000:ffffc9000b837d80 EFLAGS: 00010246 RAX: fffffffffffffff5 RBX: 0000000000000000 RCX: ffff888079eb8000 RDX: ffff888079eb8000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000b837ed8 R08: ffffffff8210a26a R09: 1ffff110068be328 R10: dffffc0000000000 R11: ffffed10068be329 R12: ffffc9000b837e10 R13: ffff88802890aa20 R14: dffffc0000000000 R15: fffffffffffffff5 FS: 00005555908b1500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff182f3cf98 CR3: 0000000011df6000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 5d pop %rbp 1: b1 ff mov $0xff,%cl 3: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14 a: fc ff df d: 4d 85 ff test %r15,%r15 10: 74 0d je 0x1f 12: 49 81 ff 01 f0 ff ff cmp $0xfffffffffffff001,%r15 19: 0f 82 a3 02 00 00 jb 0x2c2 1f: 49 83 ff f5 cmp $0xfffffffffffffff5,%r15 23: 0f 85 55 03 00 00 jne 0x37e * 29: 41 80 3e 00 cmpb $0x0,(%r14) <-- trapping instruction 2d: 74 0a je 0x39 2f: bf 05 00 00 00 mov $0x5,%edi 34: e8 28 df 18 00 call 0x18df61 39: 4c rex.WR 3a: 8b .byte 0x8b 3b: 34 25 xor $0x25,%al 3d: 05 .byte 0x5 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
