Hello, syzbot found the following issue on: HEAD commit: 8503810115fb Add linux-next specific files for 20241219 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=14412fe8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=26a4b4cc7f877b28 dashboard link: https://syzkaller.appspot.com/bug?extid=5b9d613904b2f185f2fe 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=134992df980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8e84022cbe98/disk-85038101.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/112a23063d67/vmlinux-85038101.xz kernel image: https://storage.googleapis.com/syzbot-assets/3778558f0562/bzImage-85038101.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/3e0de479e20d/mount_0.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/051056cfbd12/mount_1.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5b9d613904b2f185f2fe@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5847 at fs/namespace.c:163 mnt_ns_release+0x15d/0x1c0 fs/namespace.c:163 Modules linked in: CPU: 0 UID: 0 PID: 5847 Comm: syz-executor Not tainted 6.13.0-rc3-next-20241219-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 RIP: 0010:mnt_ns_release+0x15d/0x1c0 fs/namespace.c:163 Code: 15 bf 01 00 00 00 89 ee e8 90 fc 7d ff 85 ed 7e 39 e8 47 f8 7d ff 4c 89 ff 5b 41 5e 41 5f 5d e9 19 ca d8 ff e8 34 f8 7d ff 90 <0f> 0b 90 e9 12 ff ff ff e8 26 f8 7d ff 48 89 df be 03 00 00 00 5b RSP: 0018:ffffc90000007bb8 EFLAGS: 00010246 RAX: ffffffff8241281c RBX: 0000000000000001 RCX: ffff888034a81e00 RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffffc90000007e10 R08: ffffffff82412722 R09: 1ffffffff285ab0b R10: dffffc0000000000 R11: ffffffff82422da0 R12: ffffffff81a6a587 R13: ffff88807cec0e58 R14: dffffc0000000000 R15: ffff88807cec0e00 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f98aaffed00 CR3: 0000000076918000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> rcu_do_batch kernel/rcu/tree.c:2546 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2802 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__rb_erase_augmented include/linux/rbtree_augmented.h:228 [inline] RIP: 0010:rb_erase+0x3e/0xe70 lib/rbtree.c:443 Code: 74 24 20 48 89 fb 48 b9 00 00 00 00 00 fc ff df 48 83 c7 08 48 89 f8 48 c1 e8 03 80 3c 08 00 74 05 e8 56 08 39 f6 4c 8b 63 08 <4c> 8d 7b 10 4d 89 fd 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df 41 RSP: 0018:ffffc9000414f9f8 EFLAGS: 00000246 RAX: 1ffff11005f7cf97 RBX: ffff88802fbe7cb0 RCX: dffffc0000000000 RDX: dffffc0000000000 RSI: ffffffff9a4501a0 RDI: ffff88802fbe7cb8 RBP: 1ffff11005f7cf89 R08: ffffffff942d5857 R09: 1ffffffff285ab0a R10: dffffc0000000000 R11: fffffbfff285ab0b R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffff818b397d R15: ffff88802fbe7c00 mnt_ns_tree_remove fs/namespace.c:183 [inline] free_mnt_ns+0x10f/0x210 fs/namespace.c:3916 free_nsproxy+0x4d/0x3c0 kernel/nsproxy.c:193 do_exit+0xa2a/0x28e0 kernel/exit.c:937 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 get_signal+0x16b2/0x1750 kernel/signal.c:3017 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbe62f846fd Code: Unable to access opcode bytes at 0x7fbe62f846d3. RSP: 002b:00007ffeb8ef6dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffe00 RBX: 0000000000000003 RCX: 00007fbe62f846fd RDX: 0000000000000030 RSI: 00007ffeb8ef6e50 RDI: 00000000000000f9 RBP: 00007ffeb8ef6dfc R08: 00000000000003b8 R09: 0079746972756365 R10: 00007fbe631487e0 R11: 0000000000000246 R12: 00007fbe63145f68 R13: 000000000001946d R14: 00007ffeb8ef6e50 R15: 0000000000000001 </TASK> ---------------- Code disassembly (best guess): 0: 74 24 je 0x26 2: 20 48 89 and %cl,-0x77(%rax) 5: fb sti 6: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx d: fc ff df 10: 48 83 c7 08 add $0x8,%rdi 14: 48 89 f8 mov %rdi,%rax 17: 48 c1 e8 03 shr $0x3,%rax 1b: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) 1f: 74 05 je 0x26 21: e8 56 08 39 f6 call 0xf639087c 26: 4c 8b 63 08 mov 0x8(%rbx),%r12 * 2a: 4c 8d 7b 10 lea 0x10(%rbx),%r15 <-- trapping instruction 2e: 4d 89 fd mov %r15,%r13 31: 49 c1 ed 03 shr $0x3,%r13 35: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 3c: fc ff df 3f: 41 rex.B --- 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. 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
