Hello, syzbot found the following issue on: HEAD commit: 98555239e4c3 Merge tag 'arc-6.1-fixes' of git://git.kernel.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=12508922880000 kernel config: https://syzkaller.appspot.com/x/.config?x=a66c6c673fb555e8 dashboard link: https://syzkaller.appspot.com/bug?extid=6087eafb76a94c4ac9eb compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=167e3f4a880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1262cb86880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b9ab8f713204/disk-98555239.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5efa1b178038/vmlinux-98555239.xz kernel image: https://storage.googleapis.com/syzbot-assets/83329b87f1a8/bzImage-98555239.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6087eafb76a94c4ac9eb@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 1 PID: 3603 Comm: syz-executor414 Not tainted 6.1.0-rc2-syzkaller-00078-g98555239e4c3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 RIP: 0010:dbgfs_rm_context mm/damon/dbgfs.c:928 [inline] RIP: 0010:dbgfs_rm_context_write+0x2e3/0x4d0 mm/damon/dbgfs.c:971 Code: 00 4d 8b 36 4c 39 34 24 0f 84 e4 00 00 00 e8 34 c3 a7 ff 48 8b 44 24 18 49 63 d4 48 c1 e2 03 48 8d 34 10 48 89 f7 48 c1 ef 03 <80> 3c 2f 00 0f 85 6b 01 00 00 48 8b 05 2c 85 52 0f 4c 89 36 41 83 RSP: 0018:ffffc90003d3fcb0 EFLAGS: 00010202 RAX: 0000000000000010 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000002 RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 R13: ffff88806f180000 R14: ffff88801b67a468 R15: 0000000000000000 FS: 00005555559df300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000f000 CR3: 000000007e9a6000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> full_proxy_write+0x118/0x180 fs/debugfs/file.c:236 vfs_write+0x2d7/0xdd0 fs/read_write.c:582 ksys_write+0x127/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4ee923dd69 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd47563a18 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4ee923dd69 RDX: 000000000000fe6c RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00007f4ee9201f10 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4ee9201fa0 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dbgfs_rm_context mm/damon/dbgfs.c:928 [inline] RIP: 0010:dbgfs_rm_context_write+0x2e3/0x4d0 mm/damon/dbgfs.c:971 Code: 00 4d 8b 36 4c 39 34 24 0f 84 e4 00 00 00 e8 34 c3 a7 ff 48 8b 44 24 18 49 63 d4 48 c1 e2 03 48 8d 34 10 48 89 f7 48 c1 ef 03 <80> 3c 2f 00 0f 85 6b 01 00 00 48 8b 05 2c 85 52 0f 4c 89 36 41 83 RSP: 0018:ffffc90003d3fcb0 EFLAGS: 00010202 RAX: 0000000000000010 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000002 RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 R13: ffff88806f180000 R14: ffff88801b67a468 R15: 0000000000000000 FS: 00005555559df300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000561931b2a098 CR3: 000000007e9a6000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 4d 8b add %cl,-0x75(%rbp) 3: 36 4c 39 34 24 cmp %r14,%ss:(%rsp) 8: 0f 84 e4 00 00 00 je 0xf2 e: e8 34 c3 a7 ff callq 0xffa7c347 13: 48 8b 44 24 18 mov 0x18(%rsp),%rax 18: 49 63 d4 movslq %r12d,%rdx 1b: 48 c1 e2 03 shl $0x3,%rdx 1f: 48 8d 34 10 lea (%rax,%rdx,1),%rsi 23: 48 89 f7 mov %rsi,%rdi 26: 48 c1 ef 03 shr $0x3,%rdi * 2a: 80 3c 2f 00 cmpb $0x0,(%rdi,%rbp,1) <-- trapping instruction 2e: 0f 85 6b 01 00 00 jne 0x19f 34: 48 8b 05 2c 85 52 0f mov 0xf52852c(%rip),%rax # 0xf528567 3b: 4c 89 36 mov %r14,(%rsi) 3e: 41 rex.B 3f: 83 .byte 0x83 --- 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. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
