Messages in this thread | | | Date | Sat, 04 Dec 2021 01:56:17 -0800 | Subject | [syzbot] general protection fault in kernfs_find_ns | From | syzbot <> |
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Hello,
syzbot found the following issue on:
HEAD commit: 923dcc5eb0c1 Merge branch 'akpm' (patches from Andrew) git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1699b75eb00000 kernel config: https://syzkaller.appspot.com/x/.config?x=8c5999a5ee199b97 dashboard link: https://syzkaller.appspot.com/bug?extid=606682dc540a22b8dbef compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+606682dc540a22b8dbef@syzkaller.appspotmail.com
general protection fault, probably for non-canonical address 0xdffffc00000297c7: 0000 [#1] PREEMPT SMP KASAN KASAN: probably user-memory-access in range [0x000000000014be38-0x000000000014be3f] CPU: 1 PID: 1025 Comm: kworker/u4:4 Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:strlen+0x27/0x60 lib/string.c:487 Code: 0f 1f 00 41 57 41 56 53 49 89 fe 49 bf 00 00 00 00 00 fc ff df 48 89 f8 66 2e 0f 1f 84 00 00 00 00 00 90 48 89 c3 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 0b 48 8d 43 01 80 3b 00 75 e7 eb 13 89 d9 RSP: 0018:ffffc900045c7960 EFLAGS: 00010202 RAX: 00000000000297c7 RBX: 000000000014be38 RCX: ffff88801ca3ba01 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000014be38 RBP: 0000000000000001 R08: ffffffff82081018 R09: fffffbfff198b682 R10: fffffbfff198b682 R11: 0000000000000000 R12: ffff8880b4e63828 R13: 0000000000000000 R14: 000000000014be38 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055f79b499a90 CR3: 00000000447a1000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> kernfs_name_hash fs/kernfs/dir.c:302 [inline] kernfs_find_ns+0xe7/0x4d0 fs/kernfs/dir.c:799 kernfs_remove_by_name_ns+0x32/0x90 fs/kernfs/dir.c:1542 kernfs_remove_by_name include/linux/kernfs.h:570 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0xf7/0x280 fs/sysfs/group.c:288 sysfs_remove_groups+0x5b/0xb0 fs/sysfs/group.c:312 destroy_port drivers/infiniband/core/sysfs.c:1284 [inline] ib_free_port_attrs+0x339/0x3c0 drivers/infiniband/core/sysfs.c:1409 remove_one_compat_dev drivers/infiniband/core/device.c:1001 [inline] rdma_dev_exit_net+0x20d/0x370 drivers/infiniband/core/device.c:1139 ops_exit_list net/core/net_namespace.c:168 [inline] cleanup_net+0x758/0xc50 net/core/net_namespace.c:593 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 </TASK> Modules linked in: ---[ end trace 0b26f5c4a2c69aa9 ]--- RIP: 0010:strlen+0x27/0x60 lib/string.c:487 Code: 0f 1f 00 41 57 41 56 53 49 89 fe 49 bf 00 00 00 00 00 fc ff df 48 89 f8 66 2e 0f 1f 84 00 00 00 00 00 90 48 89 c3 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 0b 48 8d 43 01 80 3b 00 75 e7 eb 13 89 d9 RSP: 0018:ffffc900045c7960 EFLAGS: 00010202 RAX: 00000000000297c7 RBX: 000000000014be38 RCX: ffff88801ca3ba01 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000014be38 RBP: 0000000000000001 R08: ffffffff82081018 R09: fffffbfff198b682 R10: fffffbfff198b682 R11: 0000000000000000 R12: ffff8880b4e63828 R13: 0000000000000000 R14: 000000000014be38 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c72a000 CR3: 000000009369d000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 0f 1f 00 nopl (%rax) 3: 41 57 push %r15 5: 41 56 push %r14 7: 53 push %rbx 8: 49 89 fe mov %rdi,%r14 b: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 12: fc ff df 15: 48 89 f8 mov %rdi,%rax 18: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 1f: 00 00 00 22: 90 nop 23: 48 89 c3 mov %rax,%rbx 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 75 0b jne 0x3e 33: 48 8d 43 01 lea 0x1(%rbx),%rax 37: 80 3b 00 cmpb $0x0,(%rbx) 3a: 75 e7 jne 0x23 3c: eb 13 jmp 0x51 3e: 89 d9 mov %ebx,%ecx
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