Hello, We found this kernel panic issue with upstream kernel 6.3.0-rc3 and it's 100% reproduced, let me know if you need more info/testing, thanks kernel repo : https://github.com/torvalds/linux.git reproducer : run the testing from git://git.kernel.dk/liburing [ 1089.762678] Running test recv-msgall-stream.t: [ 1089.922127] Running test recv-multishot.t: [ 1090.231772] Running test reg-hint.t: [ 1090.282612] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI [ 1090.294014] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 1090.301586] CPU: 3 PID: 36765 Comm: reg-hint.t Kdump: loaded Not tainted 6.3.0-rc3.kasan+ #1 [ 1090.310035] Hardware name: Dell Inc. PowerEdge R640/0X45NX, BIOS 2.16.1 08/17/2022 [ 1090.317612] RIP: 0010:_find_next_zero_bit+0x47/0x110 [ 1090.322603] Code: 55 48 c7 c5 ff ff ff ff 48 d3 e5 48 c1 e9 06 53 48 89 fb 4c 8d 2c cd 00 00 00 00 4e 8d 24 2f 4c 89 e6 48 83 ec 10 48 c1 ee 03 <80> 3c 16 00 0f 85 9a 00 00 00 49 8b 34 24 48 f7 d6 48 21 ee 75 4b [ 1090.341358] RSP: 0018:ffff88848659fb68 EFLAGS: 00010246 [ 1090.346601] RAX: 0000000000000010 RBX: 0000000000000000 RCX: 0000000000000000 [ 1090.353742] RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 1090.360882] RBP: ffffffffffffffff R08: ffff888118b22704 R09: ffff888118b22717 [ 1090.368024] R10: ffffed10231644e2 R11: 0000000000000001 R12: 0000000000000000 [ 1090.375167] R13: 0000000000000000 R14: ffff8884c5c1a000 R15: 0000000000000000 [ 1090.382307] FS: 00007fd9683a6740(0000) GS:ffff88887f680000(0000) knlGS:0000000000000000 [ 1090.390403] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1090.396158] CR2: 0000000000404060 CR3: 0000000486274006 CR4: 00000000007706e0 [ 1090.403297] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1090.410439] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1090.417580] PKRU: 55555554 [ 1090.420292] Call Trace: [ 1090.422748] <TASK> [ 1090.424862] __io_fixed_fd_install+0x136/0x1d0 [ 1090.429328] io_fixed_fd_install+0x4c/0xc0 [ 1090.433444] io_socket+0x282/0x3b0 [ 1090.436866] io_issue_sqe+0x153/0xeb0 [ 1090.440549] io_submit_sqes+0x41d/0xcd0 [ 1090.444407] __do_sys_io_uring_enter+0x4e9/0x830 [ 1090.449044] ? __pfx___do_sys_io_uring_enter+0x10/0x10 [ 1090.454197] ? __pfx___handle_mm_fault+0x10/0x10 [ 1090.458833] ? __pfx_mt_find+0x10/0x10 [ 1090.462601] do_syscall_64+0x59/0x90 [ 1090.466196] ? handle_mm_fault+0x1a0/0x660 [ 1090.470311] ? up_read+0x1c/0xb0 [ 1090.473560] ? do_user_addr_fault+0x313/0xeb0 [ 1090.477935] ? syscall_exit_work+0x103/0x130 [ 1090.482227] ? exc_page_fault+0x57/0xc0 [ 1090.486084] entry_SYSCALL_64_after_hwframe+0x72/0xdc [ 1090.491153] RIP: 0033:0x402f3e [ 1090.494221] Code: 41 89 ca 8b ba cc 00 00 00 41 b9 08 00 00 00 b8 aa 01 00 00 41 83 ca 10 f6 82 d0 00 00 00 01 44 0f 44 d1 45 31 c0 31 d2 0f 05 <c3> 90 89 30 eb 99 0f 1f 40 00 8b 3f 45 31 c0 83 e7 06 41 0f 95 c0 [ 1090.512975] RSP: 002b:00007ffeb6c4ee98 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa [ 1090.520556] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000402f3e [ 1090.527697] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000003 [ 1090.534830] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000008 [ 1090.541965] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffeb6c4f0a8 [ 1090.549106] R13: 0000000000401860 R14: 0000000000406e08 R15: 00007fd9683e9000 [ 1090.556253] </TASK>
