RDX: 0000000000000000 RSI: 0000000020000140 RDI: 000000000000f501 RBP: 00007f85f1d00ca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006 R13: 00007fff624ab2cf R14: 00007f85f1d019c0 R15: 000000000118bf2c BUG: kernel NULL pointer dereference, address: 0000000000000010 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 10e0f8067 P4D 10e0f8067 PUD 10e0f9067 PMD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 1 PID: 8310 Comm: syz-executor.1 Not tainted 5.9.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__percpu_ref_exit+0xe/0x30 lib/percpu-refcount.c:112 Code: f2 ff ff ff eb d9 cc cc cc cc cc cc c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 8b 07 48 83 e0 fc 74 20 53 48 8b 57 08 <48> 83 7a 10 00 75 15 48 89 fb 48 89 c7 e8 50 b4 5e ff 48 c7 03 03 RSP: 0018:ffffc900029cfe78 EFLAGS: 00010202 RAX: 0000607ed3c957e0 RBX: ffff88810e139b80 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffff88810e139da8 RDI: ffff88810e139b80 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 35f462ff3b85af40 R12: 000000000001ea02 R13: ffff88810e139b98 R14: fffffffffffffff4 R15: ffff88810e5506c0 FS: 00007f85f1d01700(0000) GS:ffff88812c100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000010 CR3: 000000010e0f7000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: percpu_ref_exit+0xe/0x60 lib/percpu-refcount.c:133 ioctx_alloc+0x197/0x970 fs/aio.c:805 __do_sys_io_setup fs/aio.c:1329 [inline] __se_sys_io_setup fs/aio.c:1312 [inline] __x64_sys_io_setup+0x4f/0x1c0 fs/aio.c:1312 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de29 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f85f1d00c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000ce RAX: ffffffffffffffda RBX: 0000000000008240 RCX: 000000000045de29 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 000000000000f501 RBP: 00007f85f1d00ca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006 R13: 00007fff624ab2cf R14: 00007f85f1d019c0 R15: 000000000118bf2c Modules linked in: CR2: 0000000000000010 ---[ end trace 49410691a60fdbc7 ]--- RIP: 0010:__percpu_ref_exit+0xe/0x30 lib/percpu-refcount.c:112 Code: f2 ff ff ff eb d9 cc cc cc cc cc cc c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 8b 07 48 83 e0 fc 74 20 53 48 8b 57 08 <48> 83 7a 10 00 75 15 48 89 fb 48 89 c7 e8 50 b4 5e ff 48 c7 03 03 RSP: 0018:ffffc900029cfe78 EFLAGS: 00010202 RAX: 0000607ed3c957e0 RBX: ffff88810e139b80 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffff88810e139da8 RDI: ffff88810e139b80 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 35f462ff3b85af40 R12: 000000000001ea02 R13: ffff88810e139b98 R14: fffffffffffffff4 R15: ffff88810e5506c0 FS: 00007f85f1d01700(0000) GS:ffff88812c100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000010 CR3: 000000010e0f7000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400