Hello, syzbot found the following issue on: HEAD commit: 0a093b2893c7 Add linux-next specific files for 20230112 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=13a3e136480000 kernel config: https://syzkaller.appspot.com/x/.config?x=835f3591019836d5 dashboard link: https://syzkaller.appspot.com/bug?extid=026ab7dc882b578abd78 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8111a570d6cb/disk-0a093b28.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ecc135b7fc9a/vmlinux-0a093b28.xz kernel image: https://storage.googleapis.com/syzbot-assets/ca8d73b446ea/bzImage-0a093b28.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+026ab7dc882b578abd78@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047] CPU: 1 PID: 24704 Comm: syz-executor.0 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:sock_poll+0xc0/0x5d0 net/socket.c:1341 Code: 4c 89 f2 48 c1 ea 03 80 3c 02 00 0f 85 7e 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5d 20 48 8d 7b 40 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 51 04 00 00 48 8b 5b 40 31 c0 48 85 db 74 7f e8 RSP: 0000:ffffc900037d79e0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90004011000 RDX: 0000000000000008 RSI: ffffffff87bf3d08 RDI: 0000000000000040 RBP: ffff88808540aa00 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffc900037d7a88 R13: ffff88802bfad900 R14: ffff88808540aa20 R15: ffff888083c93a78 FS: 00007f544b91d700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8c14da8000 CR3: 000000001da7b000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> vfs_poll include/linux/poll.h:88 [inline] io_poll_check_events io_uring/poll.c:279 [inline] io_poll_task_func+0x3a6/0x1220 io_uring/poll.c:327 handle_tw_list+0xa8/0x460 io_uring/io_uring.c:1169 tctx_task_work+0x12e/0x530 io_uring/io_uring.c:1224 task_work_run+0x16f/0x270 kernel/task_work.c:179 get_signal+0x1c7/0x24f0 kernel/signal.c:2635 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f544ac8c0c9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f544b91d218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007f544adabf88 RCX: 00007f544ac8c0c9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f544adabf8c RBP: 00007f544adabf80 R08: 00007ffdfa9bc080 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 00007f544adabf8c R13: 00007ffdfa9359ef R14: 00007f544b91d300 R15: 0000000000022000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:sock_poll+0xc0/0x5d0 net/socket.c:1341 Code: 4c 89 f2 48 c1 ea 03 80 3c 02 00 0f 85 7e 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5d 20 48 8d 7b 40 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 51 04 00 00 48 8b 5b 40 31 c0 48 85 db 74 7f e8 RSP: 0000:ffffc900037d79e0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90004011000 RDX: 0000000000000008 RSI: ffffffff87bf3d08 RDI: 0000000000000040 RBP: ffff88808540aa00 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffc900037d7a88 R13: ffff88802bfad900 R14: ffff88808540aa20 R15: ffff888083c93a78 FS: 00007f544b91d700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3343a000 CR3: 000000001da7b000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 4c 89 f2 mov %r14,%rdx 3: 48 c1 ea 03 shr $0x3,%rdx 7: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) b: 0f 85 7e 04 00 00 jne 0x48f 11: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 18: fc ff df 1b: 48 8b 5d 20 mov 0x20(%rbp),%rbx 1f: 48 8d 7b 40 lea 0x40(%rbx),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 51 04 00 00 jne 0x485 34: 48 8b 5b 40 mov 0x40(%rbx),%rbx 38: 31 c0 xor %eax,%eax 3a: 48 85 db test %rbx,%rbx 3d: 74 7f je 0xbe 3f: e8 .byte 0xe8 --- This report is generated by a bot. 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